Cargoify servo

This commit is contained in:
Jack Moffitt 2014-08-28 09:34:23 -06:00
parent db2f642c32
commit c6ab60dbfc
1761 changed files with 8423 additions and 2294 deletions

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components/gfx/Cargo.toml Normal file
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[package]
name = "gfx"
version = "0.0.1"
authors = ["The Servo Project Developers"]
[lib]
name = "gfx"
path = "lib.rs"
[dependencies.macros]
path = "../macros"
[dependencies.net]
path = "../net"
[dependencies.util]
path = "../util"
[dependencies.msg]
path = "../msg"
[dependencies.style]
path = "../style"
[dependencies.azure]
git = "https://github.com/servo/rust-azure"
[dependencies.geom]
git = "https://github.com/servo/rust-geom"
[dependencies.layers]
git = "https://github.com/servo/rust-layers"
[dependencies.stb_image]
git = "https://github.com/servo/rust-stb-image"
[dependencies.png]
git = "https://github.com/servo/rust-png"
[dependencies.url]
git = "https://github.com/servo/rust-url"
[dependencies.harfbuzz]
git = "https://github.com/servo/rust-harfbuzz"
[dependencies.fontconfig]
git = "https://github.com/servo/rust-fontconfig"
[dependencies.freetype]
git = "https://github.com/servo/rust-freetype"
[dependencies.core_foundation]
git = "http://github.com/servo/rust-core-foundation"
[dependencies.core_graphics]
git = "http://github.com/servo/rust-core-graphics"
[dependencies.core_text]
git = "http://github.com/servo/rust-core-text"

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::collections::hashmap::HashMap;
use geom::size::Size2D;
use layers::platform::surface::NativePaintingGraphicsContext;
use layers::layers::LayerBuffer;
use std::hash::Hash;
use std::hash::sip::SipState;
use std::mem;
/// This is a struct used to store buffers when they are not in use.
/// The render task can quickly query for a particular size of buffer when it
/// needs it.
pub struct BufferMap {
/// A HashMap that stores the Buffers.
map: HashMap<BufferKey, BufferValue>,
/// The current amount of memory stored by the BufferMap's buffers.
mem: uint,
/// The maximum allowed memory. Unused buffers will be deleted
/// when this threshold is exceeded.
max_mem: uint,
/// A monotonically increasing counter to track how recently tile sizes were used.
counter: uint,
}
/// A key with which to store buffers. It is based on the size of the buffer.
#[deriving(Eq)]
struct BufferKey([uint, ..2]);
impl Hash for BufferKey {
fn hash(&self, state: &mut SipState) {
let BufferKey(ref bytes) = *self;
bytes.as_slice().hash(state);
}
}
impl PartialEq for BufferKey {
fn eq(&self, other: &BufferKey) -> bool {
let BufferKey(s) = *self;
let BufferKey(o) = *other;
s[0] == o[0] && s[1] == o[1]
}
}
/// Create a key from a given size
impl BufferKey {
fn get(input: Size2D<uint>) -> BufferKey {
BufferKey([input.width, input.height])
}
}
/// A helper struct to keep track of buffers in the HashMap
struct BufferValue {
/// An array of buffers, all the same size
buffers: Vec<Box<LayerBuffer>>,
/// The counter when this size was last requested
last_action: uint,
}
impl BufferMap {
// Creates a new BufferMap with a given buffer limit.
pub fn new(max_mem: uint) -> BufferMap {
BufferMap {
map: HashMap::new(),
mem: 0u,
max_mem: max_mem,
counter: 0u,
}
}
/// Insert a new buffer into the map.
pub fn insert(&mut self, graphics_context: &NativePaintingGraphicsContext, new_buffer: Box<LayerBuffer>) {
let new_key = BufferKey::get(new_buffer.get_size_2d());
// If all our buffers are the same size and we're already at our
// memory limit, no need to store this new buffer; just let it drop.
if self.mem + new_buffer.get_mem() > self.max_mem && self.map.len() == 1 &&
self.map.contains_key(&new_key) {
new_buffer.destroy(graphics_context);
return;
}
self.mem += new_buffer.get_mem();
// use lazy insertion function to prevent unnecessary allocation
let counter = &self.counter;
self.map.find_or_insert_with(new_key, |_| BufferValue {
buffers: vec!(),
last_action: *counter
}).buffers.push(new_buffer);
let mut opt_key: Option<BufferKey> = None;
while self.mem > self.max_mem {
let old_key = match opt_key {
Some(key) => key,
None => {
match self.map.iter().min_by(|&(_, x)| x.last_action) {
Some((k, _)) => *k,
None => fail!("BufferMap: tried to delete with no elements in map"),
}
}
};
if {
let list = &mut self.map.get_mut(&old_key).buffers;
let condemned_buffer = list.pop().take_unwrap();
self.mem -= condemned_buffer.get_mem();
condemned_buffer.destroy(graphics_context);
list.is_empty()
}
{ // then
self.map.pop(&old_key); // Don't store empty vectors!
opt_key = None;
} else {
opt_key = Some(old_key);
}
}
}
// Try to find a buffer for the given size.
pub fn find(&mut self, size: Size2D<uint>) -> Option<Box<LayerBuffer>> {
let mut flag = false; // True if key needs to be popped after retrieval.
let key = BufferKey::get(size);
let ret = match self.map.find_mut(&key) {
Some(ref mut buffer_val) => {
buffer_val.last_action = self.counter;
self.counter += 1;
let buffer = buffer_val.buffers.pop().take_unwrap();
self.mem -= buffer.get_mem();
if buffer_val.buffers.is_empty() {
flag = true;
}
Some(buffer)
}
None => None,
};
if flag {
self.map.pop(&key); // Don't store empty vectors!
}
ret
}
/// Destroys all buffers.
pub fn clear(&mut self, graphics_context: &NativePaintingGraphicsContext) {
let map = mem::replace(&mut self.map, HashMap::new());
for (_, value) in map.move_iter() {
for tile in value.buffers.move_iter() {
tile.destroy(graphics_context)
}
}
self.mem = 0
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use azure::AzFloat;
use AzColor = azure::azure_hl::Color;
pub type Color = AzColor;
pub fn rgb(r: u8, g: u8, b: u8) -> AzColor {
AzColor {
r: (r as AzFloat) / (255.0 as AzFloat),
g: (g as AzFloat) / (255.0 as AzFloat),
b: (b as AzFloat) / (255.0 as AzFloat),
a: 1.0 as AzFloat
}
}
pub fn rgba(r: AzFloat, g: AzFloat, b: AzFloat, a: AzFloat) -> AzColor {
AzColor { r: r, g: g, b: b, a: a }
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Servo heavily uses display lists, which are retained-mode lists of rendering commands to
//! perform. Using a list instead of rendering elements in immediate mode allows transforms, hit
//! testing, and invalidation to be performed using the same primitives as painting. It also allows
//! Servo to aggressively cull invisible and out-of-bounds rendering elements, to reduce overdraw.
//! Finally, display lists allow tiles to be farmed out onto multiple CPUs and rendered in
//! parallel (although this benefit does not apply to GPU-based rendering).
//!
//! Display items describe relatively high-level drawing operations (for example, entire borders
//! and shadows instead of lines and blur operations), to reduce the amount of allocation required.
//! They are therefore not exactly analogous to constructs like Skia pictures, which consist of
//! low-level drawing primitives.
use color::Color;
use render_context::RenderContext;
use text::glyph::CharIndex;
use text::TextRun;
use collections::dlist::DList;
use collections::dlist;
use geom::{Point2D, Rect, SideOffsets2D, Size2D, Matrix2D};
use libc::uintptr_t;
use servo_net::image::base::Image;
use servo_util::geometry::Au;
use servo_util::range::Range;
use std::fmt;
use std::mem;
use std::slice::Items;
use style::computed_values::border_style;
use sync::Arc;
use std::num::Zero;
use std::ptr;
use azure::AzFloat;
use azure::scaled_font::ScaledFont;
use azure::azure_hl::ColorPattern;
pub mod optimizer;
/// An opaque handle to a node. The only safe operation that can be performed on this node is to
/// compare it to another opaque handle or to another node.
///
/// Because the script task's GC does not trace layout, node data cannot be safely stored in layout
/// data structures. Also, layout code tends to be faster when the DOM is not being accessed, for
/// locality reasons. Using `OpaqueNode` enforces this invariant.
#[deriving(Clone, PartialEq)]
pub struct OpaqueNode(pub uintptr_t);
impl OpaqueNode {
/// Returns the address of this node, for debugging purposes.
pub fn id(&self) -> uintptr_t {
let OpaqueNode(pointer) = *self;
pointer
}
}
trait ScaledFontExtensionMethods {
fn draw_text_into_context(&self,
rctx: &RenderContext,
run: &Box<TextRun>,
range: &Range<CharIndex>,
baseline_origin: Point2D<Au>,
color: Color,
antialias: bool);
}
impl ScaledFontExtensionMethods for ScaledFont {
fn draw_text_into_context(&self,
rctx: &RenderContext,
run: &Box<TextRun>,
range: &Range<CharIndex>,
baseline_origin: Point2D<Au>,
color: Color,
antialias: bool) {
use libc::types::common::c99::uint32_t;
use azure::{struct__AzDrawOptions,
struct__AzGlyph,
struct__AzGlyphBuffer,
struct__AzPoint};
use azure::azure::{AzDrawTargetFillGlyphs};
let target = rctx.get_draw_target();
let pattern = ColorPattern::new(color);
let azure_pattern = pattern.azure_color_pattern;
assert!(azure_pattern.is_not_null());
let fields = if antialias {
0x0200
} else {
0
};
let mut options = struct__AzDrawOptions {
mAlpha: 1f64 as AzFloat,
fields: fields,
};
let mut origin = baseline_origin.clone();
let mut azglyphs = vec!();
azglyphs.reserve(range.length().to_uint());
for (glyphs, _offset, slice_range) in run.iter_slices_for_range(range) {
for (_i, glyph) in glyphs.iter_glyphs_for_char_range(&slice_range) {
let glyph_advance = glyph.advance();
let glyph_offset = glyph.offset().unwrap_or(Zero::zero());
let azglyph = struct__AzGlyph {
mIndex: glyph.id() as uint32_t,
mPosition: struct__AzPoint {
x: (origin.x + glyph_offset.x).to_nearest_px() as AzFloat,
y: (origin.y + glyph_offset.y).to_nearest_px() as AzFloat
}
};
origin = Point2D(origin.x + glyph_advance, origin.y);
azglyphs.push(azglyph)
};
}
let azglyph_buf_len = azglyphs.len();
if azglyph_buf_len == 0 { return; } // Otherwise the Quartz backend will assert.
let mut glyphbuf = struct__AzGlyphBuffer {
mGlyphs: azglyphs.as_mut_ptr(),
mNumGlyphs: azglyph_buf_len as uint32_t
};
unsafe {
// TODO(Issue #64): this call needs to move into azure_hl.rs
AzDrawTargetFillGlyphs(target.azure_draw_target,
self.get_ref(),
&mut glyphbuf,
azure_pattern,
&mut options,
ptr::mut_null());
}
}
}
/// "Steps" as defined by CSS 2.1 § E.2.
#[deriving(Clone, PartialEq)]
pub enum StackingLevel {
/// The border and backgrounds for the root of this stacking context: steps 1 and 2.
BackgroundAndBordersStackingLevel,
/// Borders and backgrounds for block-level descendants: step 4.
BlockBackgroundsAndBordersStackingLevel,
/// Floats: step 5. These are treated as pseudo-stacking contexts.
FloatStackingLevel,
/// All other content.
ContentStackingLevel,
/// Positioned descendant stacking contexts, along with their `z-index` levels.
///
/// TODO(pcwalton): `z-index` should be the actual CSS property value in order to handle
/// `auto`, not just an integer.
PositionedDescendantStackingLevel(i32)
}
impl StackingLevel {
pub fn from_background_and_border_level(level: BackgroundAndBorderLevel) -> StackingLevel {
match level {
RootOfStackingContextLevel => BackgroundAndBordersStackingLevel,
BlockLevel => BlockBackgroundsAndBordersStackingLevel,
ContentLevel => ContentStackingLevel,
}
}
}
struct StackingContext {
/// The border and backgrounds for the root of this stacking context: steps 1 and 2.
pub background_and_borders: DisplayList,
/// Borders and backgrounds for block-level descendants: step 4.
pub block_backgrounds_and_borders: DisplayList,
/// Floats: step 5. These are treated as pseudo-stacking contexts.
pub floats: DisplayList,
/// All other content.
pub content: DisplayList,
/// Positioned descendant stacking contexts, along with their `z-index` levels.
///
/// TODO(pcwalton): `z-index` should be the actual CSS property value in order to handle
/// `auto`, not just an integer.
pub positioned_descendants: Vec<(i32, DisplayList)>,
}
impl StackingContext {
/// Creates a stacking context from a display list.
fn new(list: DisplayList) -> StackingContext {
let DisplayList {
list: list
} = list;
let mut stacking_context = StackingContext {
background_and_borders: DisplayList::new(),
block_backgrounds_and_borders: DisplayList::new(),
floats: DisplayList::new(),
content: DisplayList::new(),
positioned_descendants: Vec::new(),
};
for item in list.move_iter() {
match item {
ClipDisplayItemClass(box ClipDisplayItem {
base: base,
children: sublist
}) => {
let sub_stacking_context = StackingContext::new(sublist);
stacking_context.merge_with_clip(sub_stacking_context, &base.bounds, base.node)
}
item => {
match item.base().level {
BackgroundAndBordersStackingLevel => {
stacking_context.background_and_borders.push(item)
}
BlockBackgroundsAndBordersStackingLevel => {
stacking_context.block_backgrounds_and_borders.push(item)
}
FloatStackingLevel => stacking_context.floats.push(item),
ContentStackingLevel => stacking_context.content.push(item),
PositionedDescendantStackingLevel(z_index) => {
match stacking_context.positioned_descendants
.mut_iter()
.find(|& &(z, _)| z_index == z) {
Some(&(_, ref mut my_list)) => {
my_list.push(item);
continue
}
None => {}
}
let mut new_list = DisplayList::new();
new_list.list.push(item);
stacking_context.positioned_descendants.push((z_index, new_list))
}
}
}
}
}
stacking_context
}
/// Merges another stacking context into this one, with the given clipping rectangle and DOM
/// node that supplies it.
fn merge_with_clip(&mut self,
other: StackingContext,
clip_rect: &Rect<Au>,
clipping_dom_node: OpaqueNode) {
let StackingContext {
background_and_borders,
block_backgrounds_and_borders,
floats,
content,
positioned_descendants: positioned_descendants
} = other;
let push = |destination: &mut DisplayList, source: DisplayList, level| {
if !source.is_empty() {
let base = BaseDisplayItem::new(*clip_rect, clipping_dom_node, level);
destination.push(ClipDisplayItemClass(box ClipDisplayItem::new(base, source)))
}
};
push(&mut self.background_and_borders,
background_and_borders,
BackgroundAndBordersStackingLevel);
push(&mut self.block_backgrounds_and_borders,
block_backgrounds_and_borders,
BlockBackgroundsAndBordersStackingLevel);
push(&mut self.floats, floats, FloatStackingLevel);
push(&mut self.content, content, ContentStackingLevel);
for (z_index, list) in positioned_descendants.move_iter() {
match self.positioned_descendants
.mut_iter()
.find(|& &(existing_z_index, _)| z_index == existing_z_index) {
Some(&(_, ref mut existing_list)) => {
push(existing_list, list, PositionedDescendantStackingLevel(z_index));
continue
}
None => {}
}
let mut new_list = DisplayList::new();
push(&mut new_list, list, PositionedDescendantStackingLevel(z_index));
self.positioned_descendants.push((z_index, new_list));
}
}
}
/// Which level to place backgrounds and borders in.
pub enum BackgroundAndBorderLevel {
RootOfStackingContextLevel,
BlockLevel,
ContentLevel,
}
/// A list of rendering operations to be performed.
#[deriving(Clone)]
pub struct DisplayList {
pub list: DList<DisplayItem>,
}
pub enum DisplayListIterator<'a> {
EmptyDisplayListIterator,
ParentDisplayListIterator(Items<'a,DisplayList>),
}
impl<'a> Iterator<&'a DisplayList> for DisplayListIterator<'a> {
#[inline]
fn next(&mut self) -> Option<&'a DisplayList> {
match *self {
EmptyDisplayListIterator => None,
ParentDisplayListIterator(ref mut subiterator) => subiterator.next(),
}
}
}
impl DisplayList {
/// Creates a new display list.
pub fn new() -> DisplayList {
DisplayList {
list: DList::new(),
}
}
/// Appends the given item to the display list.
pub fn push(&mut self, item: DisplayItem) {
self.list.push(item)
}
/// Appends the given display list to this display list, consuming the other display list in
/// the process.
pub fn push_all_move(&mut self, other: DisplayList) {
self.list.append(other.list)
}
pub fn debug(&self) {
if log_enabled!(::log::DEBUG) {
for item in self.list.iter() {
item.debug_with_level(0);
}
}
}
/// Draws the display list into the given render context. The display list must be flattened
/// first for correct painting.
pub fn draw_into_context(&self, render_context: &mut RenderContext,
current_transform: &Matrix2D<AzFloat>) {
debug!("Beginning display list.");
for item in self.list.iter() {
item.draw_into_context(render_context, current_transform)
}
debug!("Ending display list.");
}
/// Returns a preorder iterator over the given display list.
pub fn iter<'a>(&'a self) -> DisplayItemIterator<'a> {
ParentDisplayItemIterator(self.list.iter())
}
/// Returns true if this list is empty and false otherwise.
fn is_empty(&self) -> bool {
self.list.len() == 0
}
/// Flattens a display list into a display list with a single stacking level according to the
/// steps in CSS 2.1 § E.2.
///
/// This must be called before `draw_into_context()` is for correct results.
pub fn flatten(self, resulting_level: StackingLevel) -> DisplayList {
// TODO(pcwalton): Sort positioned children according to z-index.
let mut result = DisplayList::new();
let StackingContext {
background_and_borders,
block_backgrounds_and_borders,
floats,
content,
positioned_descendants: mut positioned_descendants
} = StackingContext::new(self);
// Steps 1 and 2: Borders and background for the root.
result.push_all_move(background_and_borders);
// TODO(pcwalton): Sort positioned children according to z-index.
// Step 3: Positioned descendants with negative z-indices.
for &(ref mut z_index, ref mut list) in positioned_descendants.mut_iter() {
if *z_index < 0 {
result.push_all_move(mem::replace(list, DisplayList::new()))
}
}
// Step 4: Block backgrounds and borders.
result.push_all_move(block_backgrounds_and_borders);
// Step 5: Floats.
result.push_all_move(floats);
// TODO(pcwalton): Step 6: Inlines that generate stacking contexts.
// Step 7: Content.
result.push_all_move(content);
// Steps 8 and 9: Positioned descendants with nonnegative z-indices.
for &(ref mut z_index, ref mut list) in positioned_descendants.mut_iter() {
if *z_index >= 0 {
result.push_all_move(mem::replace(list, DisplayList::new()))
}
}
// TODO(pcwalton): Step 10: Outlines.
result.set_stacking_level(resulting_level);
result
}
/// Sets the stacking level for this display list and all its subitems.
fn set_stacking_level(&mut self, new_level: StackingLevel) {
for item in self.list.mut_iter() {
item.mut_base().level = new_level;
match item.mut_sublist() {
None => {}
Some(sublist) => sublist.set_stacking_level(new_level),
}
}
}
}
/// One drawing command in the list.
#[deriving(Clone)]
pub enum DisplayItem {
SolidColorDisplayItemClass(Box<SolidColorDisplayItem>),
TextDisplayItemClass(Box<TextDisplayItem>),
ImageDisplayItemClass(Box<ImageDisplayItem>),
BorderDisplayItemClass(Box<BorderDisplayItem>),
LineDisplayItemClass(Box<LineDisplayItem>),
ClipDisplayItemClass(Box<ClipDisplayItem>),
/// A pseudo-display item that exists only so that queries like `ContentBoxQuery` and
/// `ContentBoxesQuery` can be answered.
///
/// FIXME(pcwalton): This is really bogus. Those queries should not consult the display list
/// but should instead consult the flow/box tree.
PseudoDisplayItemClass(Box<BaseDisplayItem>),
}
/// Information common to all display items.
#[deriving(Clone)]
pub struct BaseDisplayItem {
/// The boundaries of the display item.
///
/// TODO: Which coordinate system should this use?
pub bounds: Rect<Au>,
/// The originating DOM node.
pub node: OpaqueNode,
/// The stacking level in which this display item lives.
pub level: StackingLevel,
}
impl BaseDisplayItem {
pub fn new(bounds: Rect<Au>, node: OpaqueNode, level: StackingLevel) -> BaseDisplayItem {
BaseDisplayItem {
bounds: bounds,
node: node,
level: level,
}
}
}
/// Renders a solid color.
#[deriving(Clone)]
pub struct SolidColorDisplayItem {
pub base: BaseDisplayItem,
pub color: Color,
}
/// Renders text.
#[deriving(Clone)]
pub struct TextDisplayItem {
/// Fields common to all display items.
pub base: BaseDisplayItem,
/// The text run.
pub text_run: Arc<Box<TextRun>>,
/// The range of text within the text run.
pub range: Range<CharIndex>,
/// The color of the text.
pub text_color: Color,
pub baseline_origin: Point2D<Au>,
pub orientation: TextOrientation,
}
#[deriving(Clone, Eq, PartialEq)]
pub enum TextOrientation {
Upright,
SidewaysLeft,
SidewaysRight,
}
/// Renders an image.
#[deriving(Clone)]
pub struct ImageDisplayItem {
pub base: BaseDisplayItem,
pub image: Arc<Box<Image>>,
/// The dimensions to which the image display item should be stretched. If this is smaller than
/// the bounds of this display item, then the image will be repeated in the appropriate
/// direction to tile the entire bounds.
pub stretch_size: Size2D<Au>,
}
/// Renders a border.
#[deriving(Clone)]
pub struct BorderDisplayItem {
pub base: BaseDisplayItem,
/// The border widths
pub border: SideOffsets2D<Au>,
/// The border colors.
pub color: SideOffsets2D<Color>,
/// The border styles.
pub style: SideOffsets2D<border_style::T>
}
/// Renders a line segment.
#[deriving(Clone)]
pub struct LineDisplayItem {
pub base: BaseDisplayItem,
/// The line segment color.
pub color: Color,
/// The line segment style.
pub style: border_style::T
}
/// Clips a list of child display items to this display item's boundaries.
#[deriving(Clone)]
pub struct ClipDisplayItem {
/// The base information.
pub base: BaseDisplayItem,
/// The child nodes.
pub children: DisplayList,
}
impl ClipDisplayItem {
pub fn new(base: BaseDisplayItem, children: DisplayList) -> ClipDisplayItem {
ClipDisplayItem {
base: base,
children: children,
}
}
}
pub enum DisplayItemIterator<'a> {
EmptyDisplayItemIterator,
ParentDisplayItemIterator(dlist::Items<'a,DisplayItem>),
}
impl<'a> Iterator<&'a DisplayItem> for DisplayItemIterator<'a> {
#[inline]
fn next(&mut self) -> Option<&'a DisplayItem> {
match *self {
EmptyDisplayItemIterator => None,
ParentDisplayItemIterator(ref mut subiterator) => subiterator.next(),
}
}
}
impl DisplayItem {
/// Renders this display item into the given render context.
fn draw_into_context(&self, render_context: &mut RenderContext,
current_transform: &Matrix2D<AzFloat>) {
// This should have been flattened to the content stacking level first.
assert!(self.base().level == ContentStackingLevel);
match *self {
SolidColorDisplayItemClass(ref solid_color) => {
render_context.draw_solid_color(&solid_color.base.bounds, solid_color.color)
}
ClipDisplayItemClass(ref clip) => {
render_context.draw_push_clip(&clip.base.bounds);
for item in clip.children.iter() {
(*item).draw_into_context(render_context, current_transform);
}
render_context.draw_pop_clip();
}
TextDisplayItemClass(ref text) => {
debug!("Drawing text at {}.", text.base.bounds);
// Optimization: Dont set a transform matrix for upright text,
// and pass a strart point to `draw_text_into_context`.
// For sideways text, its easier to do the rotation such that its center
// (the baselines start point) is at (0, 0) coordinates.
let baseline_origin = match text.orientation {
Upright => text.baseline_origin,
SidewaysLeft => {
let x = text.baseline_origin.x.to_nearest_px() as AzFloat;
let y = text.baseline_origin.y.to_nearest_px() as AzFloat;
render_context.draw_target.set_transform(&current_transform.mul(
&Matrix2D::new(
0., -1.,
1., 0.,
x, y
)
));
Zero::zero()
},
SidewaysRight => {
let x = text.baseline_origin.x.to_nearest_px() as AzFloat;
let y = text.baseline_origin.y.to_nearest_px() as AzFloat;
render_context.draw_target.set_transform(&current_transform.mul(
&Matrix2D::new(
0., 1.,
-1., 0.,
x, y
)
));
Zero::zero()
}
};
render_context.font_ctx.get_render_font_from_template(
&text.text_run.font_template,
text.text_run.pt_size,
render_context.opts.render_backend
).borrow().draw_text_into_context(
render_context,
&*text.text_run,
&text.range,
baseline_origin,
text.text_color,
render_context.opts.enable_text_antialiasing
);
// Undo the transform, only when we did one.
if text.orientation != Upright {
render_context.draw_target.set_transform(current_transform)
}
}
ImageDisplayItemClass(ref image_item) => {
debug!("Drawing image at {:?}.", image_item.base.bounds);
let mut y_offset = Au(0);
while y_offset < image_item.base.bounds.size.height {
let mut x_offset = Au(0);
while x_offset < image_item.base.bounds.size.width {
let mut bounds = image_item.base.bounds;
bounds.origin.x = bounds.origin.x + x_offset;
bounds.origin.y = bounds.origin.y + y_offset;
bounds.size = image_item.stretch_size;
render_context.draw_image(bounds, image_item.image.clone());
x_offset = x_offset + image_item.stretch_size.width;
}
y_offset = y_offset + image_item.stretch_size.height;
}
}
BorderDisplayItemClass(ref border) => {
render_context.draw_border(&border.base.bounds,
border.border,
border.color,
border.style)
}
LineDisplayItemClass(ref line) => {
render_context.draw_line(&line.base.bounds,
line.color,
line.style)
}
PseudoDisplayItemClass(_) => {}
}
}
pub fn base<'a>(&'a self) -> &'a BaseDisplayItem {
match *self {
SolidColorDisplayItemClass(ref solid_color) => &solid_color.base,
TextDisplayItemClass(ref text) => &text.base,
ImageDisplayItemClass(ref image_item) => &image_item.base,
BorderDisplayItemClass(ref border) => &border.base,
LineDisplayItemClass(ref line) => &line.base,
ClipDisplayItemClass(ref clip) => &clip.base,
PseudoDisplayItemClass(ref base) => &**base,
}
}
pub fn mut_base<'a>(&'a mut self) -> &'a mut BaseDisplayItem {
match *self {
SolidColorDisplayItemClass(ref mut solid_color) => &mut solid_color.base,
TextDisplayItemClass(ref mut text) => &mut text.base,
ImageDisplayItemClass(ref mut image_item) => &mut image_item.base,
BorderDisplayItemClass(ref mut border) => &mut border.base,
LineDisplayItemClass(ref mut line) => &mut line.base,
ClipDisplayItemClass(ref mut clip) => &mut clip.base,
PseudoDisplayItemClass(ref mut base) => &mut **base,
}
}
pub fn bounds(&self) -> Rect<Au> {
self.base().bounds
}
pub fn children<'a>(&'a self) -> DisplayItemIterator<'a> {
match *self {
ClipDisplayItemClass(ref clip) => ParentDisplayItemIterator(clip.children.list.iter()),
SolidColorDisplayItemClass(..) |
TextDisplayItemClass(..) |
ImageDisplayItemClass(..) |
BorderDisplayItemClass(..) |
LineDisplayItemClass(..) |
PseudoDisplayItemClass(..) => EmptyDisplayItemIterator,
}
}
/// Returns a mutable reference to the sublist contained within this display list item, if any.
fn mut_sublist<'a>(&'a mut self) -> Option<&'a mut DisplayList> {
match *self {
ClipDisplayItemClass(ref mut clip) => Some(&mut clip.children),
SolidColorDisplayItemClass(..) |
TextDisplayItemClass(..) |
ImageDisplayItemClass(..) |
BorderDisplayItemClass(..) |
LineDisplayItemClass(..) |
PseudoDisplayItemClass(..) => None,
}
}
pub fn debug_with_level(&self, level: uint) {
let mut indent = String::new();
for _ in range(0, level) {
indent.push_str("| ")
}
debug!("{}+ {}", indent, self);
for child in self.children() {
child.debug_with_level(level + 1);
}
}
}
impl fmt::Show for DisplayItem {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{} @ {} ({:x})",
match *self {
SolidColorDisplayItemClass(_) => "SolidColor",
TextDisplayItemClass(_) => "Text",
ImageDisplayItemClass(_) => "Image",
BorderDisplayItemClass(_) => "Border",
LineDisplayItemClass(_) => "Line",
ClipDisplayItemClass(_) => "Clip",
PseudoDisplayItemClass(_) => "Pseudo",
},
self.base().bounds,
self.base().node.id(),
)
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use display_list::{BorderDisplayItemClass, ClipDisplayItem, ClipDisplayItemClass, DisplayItem};
use display_list::{DisplayList, ImageDisplayItemClass, LineDisplayItemClass};
use display_list::{PseudoDisplayItemClass, SolidColorDisplayItemClass, TextDisplayItemClass};
use collections::dlist::DList;
use geom::rect::Rect;
use servo_util::geometry::Au;
use sync::Arc;
pub struct DisplayListOptimizer {
display_list: Arc<DisplayList>,
/// The visible rect in page coordinates.
visible_rect: Rect<Au>,
}
impl DisplayListOptimizer {
/// `visible_rect` specifies the visible rect in page coordinates.
pub fn new(display_list: Arc<DisplayList>, visible_rect: Rect<Au>) -> DisplayListOptimizer {
DisplayListOptimizer {
display_list: display_list,
visible_rect: visible_rect,
}
}
pub fn optimize(self) -> DisplayList {
self.process_display_list(&*self.display_list)
}
fn process_display_list(&self, display_list: &DisplayList) -> DisplayList {
let mut result = DList::new();
for item in display_list.iter() {
match self.process_display_item(item) {
None => {}
Some(display_item) => result.push(display_item),
}
}
DisplayList {
list: result,
}
}
fn process_display_item(&self, display_item: &DisplayItem) -> Option<DisplayItem> {
// Eliminate display items outside the visible region.
if !self.visible_rect.intersects(&display_item.base().bounds) {
return None
}
// Recur.
match *display_item {
ClipDisplayItemClass(ref clip) => {
let new_children = self.process_display_list(&clip.children);
if new_children.is_empty() {
return None
}
Some(ClipDisplayItemClass(box ClipDisplayItem {
base: clip.base.clone(),
children: new_children,
}))
}
BorderDisplayItemClass(_) | ImageDisplayItemClass(_) | LineDisplayItemClass(_) |
PseudoDisplayItemClass(_) | SolidColorDisplayItemClass(_) |
TextDisplayItemClass(_) => {
Some((*display_item).clone())
}
}
}
}

213
components/gfx/font.rs Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use geom::{Point2D, Rect, Size2D};
use std::mem;
use std::string;
use std::rc::Rc;
use std::cell::RefCell;
use servo_util::cache::{Cache, HashCache};
use style::computed_values::{font_weight, font_style};
use sync::Arc;
use servo_util::geometry::Au;
use platform::font_context::FontContextHandle;
use platform::font::{FontHandle, FontTable};
use text::glyph::{GlyphStore, GlyphId};
use text::shaping::ShaperMethods;
use text::{Shaper, TextRun};
use font_template::FontTemplateDescriptor;
use platform::font_template::FontTemplateData;
// FontHandle encapsulates access to the platform's font API,
// e.g. quartz, FreeType. It provides access to metrics and tables
// needed by the text shaper as well as access to the underlying font
// resources needed by the graphics layer to draw glyphs.
pub trait FontHandleMethods {
fn new_from_template(fctx: &FontContextHandle, template: Arc<FontTemplateData>, pt_size: Option<f64>)
-> Result<Self,()>;
fn get_template(&self) -> Arc<FontTemplateData>;
fn family_name(&self) -> String;
fn face_name(&self) -> String;
fn is_italic(&self) -> bool;
fn boldness(&self) -> font_weight::T;
fn glyph_index(&self, codepoint: char) -> Option<GlyphId>;
fn glyph_h_advance(&self, GlyphId) -> Option<FractionalPixel>;
fn glyph_h_kerning(&self, GlyphId, GlyphId) -> FractionalPixel;
fn get_metrics(&self) -> FontMetrics;
fn get_table_for_tag(&self, FontTableTag) -> Option<FontTable>;
}
// Used to abstract over the shaper's choice of fixed int representation.
pub type FractionalPixel = f64;
pub type FontTableTag = u32;
pub trait FontTableTagConversions {
fn tag_to_str(&self) -> String;
}
impl FontTableTagConversions for FontTableTag {
fn tag_to_str(&self) -> String {
unsafe {
let reversed = string::raw::from_buf_len(mem::transmute(self), 4);
return String::from_chars([reversed.as_slice().char_at(3),
reversed.as_slice().char_at(2),
reversed.as_slice().char_at(1),
reversed.as_slice().char_at(0)]);
}
}
}
pub trait FontTableMethods {
fn with_buffer(&self, |*const u8, uint|);
}
#[deriving(Clone)]
pub struct FontMetrics {
pub underline_size: Au,
pub underline_offset: Au,
pub strikeout_size: Au,
pub strikeout_offset: Au,
pub leading: Au,
pub x_height: Au,
pub em_size: Au,
pub ascent: Au,
pub descent: Au,
pub max_advance: Au,
pub line_gap: Au,
}
// TODO(Issue #179): eventually this will be split into the specified
// and used font styles. specified contains uninterpreted CSS font
// property values, while 'used' is attached to gfx::Font to descript
// the instance's properties.
//
// For now, the cases are differentiated with a typedef
#[deriving(Clone, PartialEq)]
pub struct FontStyle {
pub pt_size: f64,
pub weight: font_weight::T,
pub style: font_style::T,
pub families: Vec<String>,
// TODO(Issue #198): font-stretch, text-decoration, font-variant, size-adjust
}
pub type SpecifiedFontStyle = FontStyle;
pub type UsedFontStyle = FontStyle;
pub struct Font {
pub handle: FontHandle,
pub metrics: FontMetrics,
pub descriptor: FontTemplateDescriptor,
pub pt_size: f64,
pub shaper: Option<Shaper>,
pub shape_cache: HashCache<String, Arc<GlyphStore>>,
pub glyph_advance_cache: HashCache<u32, FractionalPixel>,
}
impl Font {
pub fn shape_text(&mut self, text: String, is_whitespace: bool) -> Arc<GlyphStore> {
self.make_shaper();
let shaper = &self.shaper;
self.shape_cache.find_or_create(&text, |txt| {
let mut glyphs = GlyphStore::new(text.as_slice().char_len() as int, is_whitespace);
shaper.get_ref().shape_text(txt.as_slice(), &mut glyphs);
Arc::new(glyphs)
})
}
fn make_shaper<'a>(&'a mut self) -> &'a Shaper {
// fast path: already created a shaper
match self.shaper {
Some(ref shaper) => {
let s: &'a Shaper = shaper;
return s;
},
None => {}
}
let shaper = Shaper::new(self);
self.shaper = Some(shaper);
self.shaper.get_ref()
}
pub fn get_table_for_tag(&self, tag: FontTableTag) -> Option<FontTable> {
let result = self.handle.get_table_for_tag(tag);
let status = if result.is_some() { "Found" } else { "Didn't find" };
debug!("{:s} font table[{:s}] with family={}, face={}",
status, tag.tag_to_str(),
self.handle.family_name(), self.handle.face_name());
return result;
}
pub fn glyph_index(&self, codepoint: char) -> Option<GlyphId> {
self.handle.glyph_index(codepoint)
}
pub fn glyph_h_kerning(&mut self, first_glyph: GlyphId, second_glyph: GlyphId) -> FractionalPixel {
self.handle.glyph_h_kerning(first_glyph, second_glyph)
}
pub fn glyph_h_advance(&mut self, glyph: GlyphId) -> FractionalPixel {
let handle = &self.handle;
self.glyph_advance_cache.find_or_create(&glyph, |glyph| {
match handle.glyph_h_advance(*glyph) {
Some(adv) => adv,
None => 10f64 as FractionalPixel // FIXME: Need fallback strategy
}
})
}
}
pub struct FontGroup {
pub fonts: Vec<Rc<RefCell<Font>>>,
}
impl FontGroup {
pub fn new(fonts: Vec<Rc<RefCell<Font>>>) -> FontGroup {
FontGroup {
fonts: fonts
}
}
pub fn create_textrun(&self, text: String) -> TextRun {
assert!(self.fonts.len() > 0);
// TODO(Issue #177): Actually fall back through the FontGroup when a font is unsuitable.
TextRun::new(&mut *self.fonts[0].borrow_mut(), text.clone())
}
}
pub struct RunMetrics {
// may be negative due to negative width (i.e., kerning of '.' in 'P.T.')
pub advance_width: Au,
pub ascent: Au, // nonzero
pub descent: Au, // nonzero
// this bounding box is relative to the left origin baseline.
// so, bounding_box.position.y = -ascent
pub bounding_box: Rect<Au>
}
impl RunMetrics {
pub fn new(advance: Au, ascent: Au, descent: Au) -> RunMetrics {
let bounds = Rect(Point2D(Au(0), -ascent),
Size2D(advance, ascent + descent));
// TODO(Issue #125): support loose and tight bounding boxes; using the
// ascent+descent and advance is sometimes too generous and
// looking at actual glyph extents can yield a tighter box.
RunMetrics {
advance_width: advance,
bounding_box: bounds,
ascent: ascent,
descent: descent,
}
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use platform::font_list::get_available_families;
use platform::font_list::get_variations_for_family;
use platform::font_list::get_last_resort_font_families;
use platform::font_context::FontContextHandle;
use std::collections::HashMap;
use sync::Arc;
use font_template::{FontTemplate, FontTemplateDescriptor};
use platform::font_template::FontTemplateData;
use servo_net::resource_task::{ResourceTask, load_whole_resource};
use url::Url;
/// A list of font templates that make up a given font family.
struct FontFamily {
templates: Vec<FontTemplate>,
}
impl FontFamily {
fn new() -> FontFamily {
FontFamily {
templates: vec!(),
}
}
/// Find a font in this family that matches a given desriptor.
fn find_font_for_style<'a>(&'a mut self, desc: &FontTemplateDescriptor, fctx: &FontContextHandle)
-> Option<Arc<FontTemplateData>> {
// TODO(Issue #189): optimize lookup for
// regular/bold/italic/bolditalic with fixed offsets and a
// static decision table for fallback between these values.
// TODO(Issue #190): if not in the fast path above, do
// expensive matching of weights, etc.
for template in self.templates.mut_iter() {
let maybe_template = template.get_if_matches(fctx, desc);
if maybe_template.is_some() {
return maybe_template;
}
}
// If a request is made for a font family that exists,
// pick the first valid font in the family if we failed
// to find an exact match for the descriptor.
for template in self.templates.mut_iter() {
let maybe_template = template.get();
if maybe_template.is_some() {
return maybe_template;
}
}
None
}
fn add_template(&mut self, identifier: &str, maybe_data: Option<Vec<u8>>) {
for template in self.templates.iter() {
if template.identifier() == identifier {
return;
}
}
let template = FontTemplate::new(identifier, maybe_data);
self.templates.push(template);
}
}
/// Commands that the FontContext sends to the font cache task.
pub enum Command {
GetFontTemplate(String, FontTemplateDescriptor, Sender<Reply>),
AddWebFont(String, Url, Sender<()>),
Exit(Sender<()>),
}
/// Reply messages sent from the font cache task to the FontContext caller.
pub enum Reply {
GetFontTemplateReply(Arc<FontTemplateData>),
}
/// The font cache task itself. It maintains a list of reference counted
/// font templates that are currently in use.
struct FontCache {
port: Receiver<Command>,
generic_fonts: HashMap<String, String>,
local_families: HashMap<String, FontFamily>,
web_families: HashMap<String, FontFamily>,
font_context: FontContextHandle,
resource_task: ResourceTask,
}
impl FontCache {
fn run(&mut self) {
loop {
let msg = self.port.recv();
match msg {
GetFontTemplate(family, descriptor, result) => {
let maybe_font_template = self.get_font_template(&family, &descriptor);
let font_template = match maybe_font_template {
Some(font_template) => font_template,
None => self.get_last_resort_template(&descriptor),
};
result.send(GetFontTemplateReply(font_template));
}
AddWebFont(family_name, url, result) => {
let maybe_resource = load_whole_resource(&self.resource_task, url.clone());
match maybe_resource {
Ok((_, bytes)) => {
if !self.web_families.contains_key(&family_name) {
let family = FontFamily::new();
self.web_families.insert(family_name.clone(), family);
}
let family = self.web_families.get_mut(&family_name);
family.add_template(format!("{}", url).as_slice(), Some(bytes));
},
Err(msg) => {
fail!("{}: url={}", msg, url);
}
}
result.send(());
}
Exit(result) => {
result.send(());
break;
}
}
}
}
fn refresh_local_families(&mut self) {
self.local_families.clear();
get_available_families(|family_name| {
if !self.local_families.contains_key(&family_name) {
let family = FontFamily::new();
self.local_families.insert(family_name, family);
}
});
}
fn transform_family(&self, family: &String) -> String {
match self.generic_fonts.find(family) {
None => family.to_string(),
Some(mapped_family) => (*mapped_family).clone()
}
}
fn find_font_in_local_family<'a>(&'a mut self, family_name: &String, desc: &FontTemplateDescriptor)
-> Option<Arc<FontTemplateData>> {
// TODO(Issue #188): look up localized font family names if canonical name not found
// look up canonical name
if self.local_families.contains_key(family_name) {
debug!("FontList: Found font family with name={:s}", family_name.to_string());
let s = self.local_families.get_mut(family_name);
if s.templates.len() == 0 {
get_variations_for_family(family_name.as_slice(), |path| {
s.add_template(path.as_slice(), None);
});
}
// TODO(Issue #192: handle generic font families, like 'serif' and 'sans-serif'.
// if such family exists, try to match style to a font
let result = s.find_font_for_style(desc, &self.font_context);
if result.is_some() {
return result;
}
None
} else {
debug!("FontList: Couldn't find font family with name={:s}", family_name.to_string());
None
}
}
fn find_font_in_web_family<'a>(&'a mut self, family_name: &String, desc: &FontTemplateDescriptor)
-> Option<Arc<FontTemplateData>> {
if self.web_families.contains_key(family_name) {
let family = self.web_families.get_mut(family_name);
let maybe_font = family.find_font_for_style(desc, &self.font_context);
maybe_font
} else {
None
}
}
fn get_font_template(&mut self, family: &String, desc: &FontTemplateDescriptor) -> Option<Arc<FontTemplateData>> {
let transformed_family_name = self.transform_family(family);
let mut maybe_template = self.find_font_in_web_family(&transformed_family_name, desc);
if maybe_template.is_none() {
maybe_template = self.find_font_in_local_family(&transformed_family_name, desc);
}
maybe_template
}
fn get_last_resort_template(&mut self, desc: &FontTemplateDescriptor) -> Arc<FontTemplateData> {
let last_resort = get_last_resort_font_families();
for family in last_resort.iter() {
let maybe_font_in_family = self.find_font_in_local_family(family, desc);
if maybe_font_in_family.is_some() {
return maybe_font_in_family.unwrap();
}
}
fail!("Unable to find any fonts that match (do you have fallback fonts installed?)");
}
}
/// The public interface to the font cache task, used exclusively by
/// the per-thread/task FontContext structures.
#[deriving(Clone)]
pub struct FontCacheTask {
chan: Sender<Command>,
}
impl FontCacheTask {
pub fn new(resource_task: ResourceTask) -> FontCacheTask {
let (chan, port) = channel();
spawn(proc() {
// TODO: Allow users to specify these.
let mut generic_fonts = HashMap::with_capacity(5);
generic_fonts.insert("serif".to_string(), "Times New Roman".to_string());
generic_fonts.insert("sans-serif".to_string(), "Arial".to_string());
generic_fonts.insert("cursive".to_string(), "Apple Chancery".to_string());
generic_fonts.insert("fantasy".to_string(), "Papyrus".to_string());
generic_fonts.insert("monospace".to_string(), "Menlo".to_string());
let mut cache = FontCache {
port: port,
generic_fonts: generic_fonts,
local_families: HashMap::new(),
web_families: HashMap::new(),
font_context: FontContextHandle::new(),
resource_task: resource_task,
};
cache.refresh_local_families();
cache.run();
});
FontCacheTask {
chan: chan,
}
}
pub fn get_font_template(&self, family: String, desc: FontTemplateDescriptor)
-> Arc<FontTemplateData> {
let (response_chan, response_port) = channel();
self.chan.send(GetFontTemplate(family, desc, response_chan));
let reply = response_port.recv();
match reply {
GetFontTemplateReply(data) => {
data
}
}
}
pub fn add_web_font(&self, family: String, url: Url) {
let (response_chan, response_port) = channel();
self.chan.send(AddWebFont(family, url, response_chan));
response_port.recv();
}
pub fn exit(&self) {
let (response_chan, response_port) = channel();
self.chan.send(Exit(response_chan));
response_port.recv();
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use font::{Font, FontGroup};
use font::SpecifiedFontStyle;
use platform::font_context::FontContextHandle;
use style::computed_values::font_style;
use font_cache_task::FontCacheTask;
use font_template::FontTemplateDescriptor;
use platform::font_template::FontTemplateData;
use font::FontHandleMethods;
use platform::font::FontHandle;
use servo_util::cache::HashCache;
use std::rc::{Rc, Weak};
use std::cell::RefCell;
use sync::Arc;
use azure::AzFloat;
use azure::azure_hl::BackendType;
use azure::scaled_font::ScaledFont;
#[cfg(target_os="linux")]
#[cfg(target_os="android")]
use azure::scaled_font::FontData;
#[cfg(target_os="linux")]
#[cfg(target_os="android")]
fn create_scaled_font(backend: BackendType, template: &Arc<FontTemplateData>, pt_size: f64) -> ScaledFont {
ScaledFont::new(backend, FontData(&template.bytes), pt_size as AzFloat)
}
#[cfg(target_os="macos")]
fn create_scaled_font(backend: BackendType, template: &Arc<FontTemplateData>, pt_size: f64) -> ScaledFont {
let cgfont = template.ctfont.get_ref().copy_to_CGFont();
ScaledFont::new(backend, &cgfont, pt_size as AzFloat)
}
/// A cached azure font (per render task) that
/// can be shared by multiple text runs.
struct RenderFontCacheEntry {
pt_size: f64,
identifier: String,
font: Rc<RefCell<ScaledFont>>,
}
/// The FontContext represents the per-thread/task state necessary for
/// working with fonts. It is the public API used by the layout and
/// render code. It talks directly to the font cache task where
/// required.
pub struct FontContext {
platform_handle: FontContextHandle,
font_cache_task: FontCacheTask,
/// Weak reference as the layout FontContext is persistent.
layout_font_cache: Vec<Weak<RefCell<Font>>>,
/// Strong reference as the render FontContext is (for now) recycled
/// per frame. TODO: Make this weak when incremental redraw is done.
render_font_cache: Vec<RenderFontCacheEntry>,
}
impl FontContext {
pub fn new(font_cache_task: FontCacheTask) -> FontContext {
let handle = FontContextHandle::new();
FontContext {
platform_handle: handle,
font_cache_task: font_cache_task,
layout_font_cache: vec!(),
render_font_cache: vec!(),
}
}
/// Create a font for use in layout calculations.
fn create_layout_font(&self, template: Arc<FontTemplateData>,
descriptor: FontTemplateDescriptor, pt_size: f64) -> Font {
let handle: FontHandle = FontHandleMethods::new_from_template(&self.platform_handle, template, Some(pt_size)).unwrap();
let metrics = handle.get_metrics();
Font {
handle: handle,
shaper: None,
descriptor: descriptor,
pt_size: pt_size,
metrics: metrics,
shape_cache: HashCache::new(),
glyph_advance_cache: HashCache::new(),
}
}
/// Create a group of fonts for use in layout calculations. May return
/// a cached font if this font instance has already been used by
/// this context.
pub fn get_layout_font_group_for_style(&mut self, style: &SpecifiedFontStyle) -> FontGroup {
// Remove all weak pointers that have been dropped.
self.layout_font_cache.retain(|maybe_font| {
maybe_font.upgrade().is_some()
});
let mut fonts: Vec<Rc<RefCell<Font>>> = vec!();
for family in style.families.iter() {
let desc = FontTemplateDescriptor::new(style.weight, style.style == font_style::italic);
// GWTODO: Check on real pages if this is faster as Vec() or HashMap().
let mut cache_hit = false;
for maybe_cached_font in self.layout_font_cache.iter() {
let cached_font = maybe_cached_font.upgrade().unwrap();
if cached_font.borrow().descriptor == desc {
fonts.push(cached_font.clone());
cache_hit = true;
break;
}
}
if !cache_hit {
let font_template = self.font_cache_task.get_font_template(family.clone(), desc.clone());
let layout_font = Rc::new(RefCell::new(self.create_layout_font(font_template, desc.clone(), style.pt_size)));
self.layout_font_cache.push(layout_font.downgrade());
fonts.push(layout_font);
}
}
FontGroup::new(fonts)
}
/// Create a render font for use with azure. May return a cached
/// reference if already used by this font context.
pub fn get_render_font_from_template(&mut self, template: &Arc<FontTemplateData>, pt_size: f64, backend: BackendType) -> Rc<RefCell<ScaledFont>> {
for cached_font in self.render_font_cache.iter() {
if cached_font.pt_size == pt_size &&
cached_font.identifier == template.identifier {
return cached_font.font.clone();
}
}
let render_font = Rc::new(RefCell::new(create_scaled_font(backend, template, pt_size)));
self.render_font_cache.push(RenderFontCacheEntry{
font: render_font.clone(),
pt_size: pt_size,
identifier: template.identifier.clone(),
});
render_font
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use style::computed_values::font_weight;
use platform::font_context::FontContextHandle;
use platform::font::FontHandle;
use platform::font_template::FontTemplateData;
use sync::{Arc, Weak};
use font::FontHandleMethods;
/// Describes how to select a font from a given family.
/// This is very basic at the moment and needs to be
/// expanded or refactored when we support more of the
/// font styling parameters.
#[deriving(Clone)]
pub struct FontTemplateDescriptor {
pub weight: font_weight::T,
pub italic: bool,
}
impl FontTemplateDescriptor {
pub fn new(weight: font_weight::T, italic: bool) -> FontTemplateDescriptor {
FontTemplateDescriptor {
weight: weight,
italic: italic,
}
}
}
impl PartialEq for FontTemplateDescriptor {
fn eq(&self, other: &FontTemplateDescriptor) -> bool {
self.weight.is_bold() == other.weight.is_bold() &&
self.italic == other.italic
}
}
/// This describes all the information needed to create
/// font instance handles. It contains a unique
/// FontTemplateData structure that is platform specific.
pub struct FontTemplate {
identifier: String,
descriptor: Option<FontTemplateDescriptor>,
weak_ref: Option<Weak<FontTemplateData>>,
strong_ref: Option<Arc<FontTemplateData>>, // GWTODO: Add code path to unset the strong_ref for web fonts!
is_valid: bool,
}
/// Holds all of the template information for a font that
/// is common, regardless of the number of instances of
/// this font handle per thread.
impl FontTemplate {
pub fn new(identifier: &str, maybe_bytes: Option<Vec<u8>>) -> FontTemplate {
let maybe_data = match maybe_bytes {
Some(_) => Some(FontTemplateData::new(identifier, maybe_bytes)),
None => None,
};
let maybe_strong_ref = match maybe_data {
Some(data) => Some(Arc::new(data)),
None => None,
};
let maybe_weak_ref = match maybe_strong_ref {
Some(ref strong_ref) => Some(strong_ref.downgrade()),
None => None,
};
FontTemplate {
identifier: identifier.to_string(),
descriptor: None,
weak_ref: maybe_weak_ref,
strong_ref: maybe_strong_ref,
is_valid: true,
}
}
pub fn identifier<'a>(&'a self) -> &'a str {
self.identifier.as_slice()
}
/// Get the data for creating a font if it matches a given descriptor.
pub fn get_if_matches(&mut self, fctx: &FontContextHandle,
requested_desc: &FontTemplateDescriptor) -> Option<Arc<FontTemplateData>> {
// The font template data can be unloaded when nothing is referencing
// it (via the Weak reference to the Arc above). However, if we have
// already loaded a font, store the style information about it separately,
// so that we can do font matching against it again in the future
// without having to reload the font (unless it is an actual match).
match self.descriptor {
Some(actual_desc) => {
if *requested_desc == actual_desc {
Some(self.get_data())
} else {
None
}
},
None => {
if self.is_valid {
let data = self.get_data();
let handle: Result<FontHandle, ()> = FontHandleMethods::new_from_template(fctx, data.clone(), None);
match handle {
Ok(handle) => {
let actual_desc = FontTemplateDescriptor::new(handle.boldness(),
handle.is_italic());
let desc_match = actual_desc == *requested_desc;
self.descriptor = Some(actual_desc);
self.is_valid = true;
if desc_match {
Some(data)
} else {
None
}
}
Err(()) => {
self.is_valid = false;
debug!("Unable to create a font from template {}", self.identifier);
None
}
}
} else {
None
}
}
}
}
/// Get the data for creating a font.
pub fn get(&mut self) -> Option<Arc<FontTemplateData>> {
match self.is_valid {
true => Some(self.get_data()),
false => None
}
}
/// Get the font template data. If any strong references still
/// exist, it will return a clone, otherwise it will load the
/// font data and store a weak reference to it internally.
pub fn get_data(&mut self) -> Arc<FontTemplateData> {
let maybe_data = match self.weak_ref {
Some(ref data) => data.upgrade(),
None => None,
};
match maybe_data {
Some(data) => data,
None => {
assert!(self.strong_ref.is_none());
let template_data = Arc::new(FontTemplateData::new(self.identifier.as_slice(), None));
self.weak_ref = Some(template_data.downgrade());
template_data
}
}
}
}

72
components/gfx/lib.rs Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#![feature(globs, macro_rules, phase, unsafe_destructor)]
#![feature(phase)]
#[phase(plugin, link)]
extern crate log;
extern crate debug;
extern crate azure;
extern crate collections;
extern crate geom;
extern crate layers;
extern crate libc;
extern crate native;
extern crate rustrt;
extern crate stb_image;
extern crate png;
extern crate serialize;
#[phase(plugin)]
extern crate servo_macros = "macros";
extern crate servo_net = "net";
#[phase(plugin, link)]
extern crate servo_util = "util";
extern crate servo_msg = "msg";
extern crate style;
extern crate sync;
extern crate url;
// Eventually we would like the shaper to be pluggable, as many operating systems have their own
// shapers. For now, however, this is a hard dependency.
extern crate harfbuzz;
// Linux and Android-specific library dependencies
#[cfg(target_os="linux")] #[cfg(target_os="android")] extern crate fontconfig;
#[cfg(target_os="linux")] #[cfg(target_os="android")] extern crate freetype;
// Mac OS-specific library dependencies
#[cfg(target_os="macos")] extern crate core_foundation;
#[cfg(target_os="macos")] extern crate core_graphics;
#[cfg(target_os="macos")] extern crate core_text;
pub use render_context::RenderContext;
// Private rendering modules
mod render_context;
// Rendering
pub mod color;
#[path="display_list/mod.rs"]
pub mod display_list;
pub mod render_task;
// Fonts
pub mod font;
pub mod font_context;
pub mod font_cache_task;
pub mod font_template;
// Misc.
mod buffer_map;
// Platform-specific implementations.
#[path="platform/mod.rs"]
pub mod platform;
// Text
#[path = "text/mod.rs"]
pub mod text;

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
extern crate freetype;
use font::{FontHandleMethods, FontMetrics, FontTableMethods};
use font::{FontTableTag, FractionalPixel};
use servo_util::geometry::Au;
use servo_util::geometry;
use platform::font_context::FontContextHandle;
use text::glyph::GlyphId;
use text::util::{float_to_fixed, fixed_to_float};
use style::computed_values::font_weight;
use platform::font_template::FontTemplateData;
use freetype::freetype::{FT_Get_Char_Index, FT_Get_Postscript_Name};
use freetype::freetype::{FT_Load_Glyph, FT_Set_Char_Size};
use freetype::freetype::{FT_Get_Kerning, FT_Get_Sfnt_Table};
use freetype::freetype::{FT_New_Memory_Face, FT_Done_Face};
use freetype::freetype::{FTErrorMethods, FT_F26Dot6, FT_Face, FT_FaceRec};
use freetype::freetype::{FT_GlyphSlot, FT_Library, FT_Long, FT_ULong};
use freetype::freetype::{FT_KERNING_DEFAULT, FT_STYLE_FLAG_ITALIC, FT_STYLE_FLAG_BOLD};
use freetype::freetype::{FT_SizeRec, FT_UInt, FT_Size_Metrics, struct_FT_Vector_};
use freetype::freetype::{ft_sfnt_os2};
use freetype::tt_os2::TT_OS2;
use std::mem;
use std::ptr;
use std::string;
use sync::Arc;
fn float_to_fixed_ft(f: f64) -> i32 {
float_to_fixed(6, f)
}
fn fixed_to_float_ft(f: i32) -> f64 {
fixed_to_float(6, f)
}
pub struct FontTable;
impl FontTableMethods for FontTable {
fn with_buffer(&self, _blk: |*const u8, uint|) {
fail!()
}
}
pub struct FontHandle {
// The font binary. This must stay valid for the lifetime of the font,
// if the font is created using FT_Memory_Face.
pub font_data: Arc<FontTemplateData>,
pub face: FT_Face,
pub handle: FontContextHandle
}
#[unsafe_destructor]
impl Drop for FontHandle {
fn drop(&mut self) {
assert!(self.face.is_not_null());
unsafe {
if !FT_Done_Face(self.face).succeeded() {
fail!("FT_Done_Face failed");
}
}
}
}
impl FontHandleMethods for FontHandle {
fn new_from_template(fctx: &FontContextHandle,
template: Arc<FontTemplateData>,
pt_size: Option<f64>)
-> Result<FontHandle, ()> {
let ft_ctx: FT_Library = fctx.ctx.ctx;
if ft_ctx.is_null() { return Err(()); }
let bytes = &template.deref().bytes;
let face_result = create_face_from_buffer(ft_ctx, bytes.as_ptr(), bytes.len(), pt_size);
// TODO: this could be more simply written as result::chain
// and moving buf into the struct ctor, but cant' move out of
// captured binding.
return match face_result {
Ok(face) => {
let handle = FontHandle {
face: face,
font_data: template.clone(),
handle: fctx.clone()
};
Ok(handle)
}
Err(()) => Err(())
};
fn create_face_from_buffer(lib: FT_Library, cbuf: *const u8, cbuflen: uint, pt_size: Option<f64>)
-> Result<FT_Face, ()> {
unsafe {
let mut face: FT_Face = ptr::mut_null();
let face_index = 0 as FT_Long;
let result = FT_New_Memory_Face(lib, cbuf, cbuflen as FT_Long,
face_index, &mut face);
if !result.succeeded() || face.is_null() {
return Err(());
}
match pt_size {
Some(s) => {
match FontHandle::set_char_size(face, s) {
Ok(_) => Ok(face),
Err(_) => Err(()),
}
}
None => Ok(face),
}
}
}
}
fn get_template(&self) -> Arc<FontTemplateData> {
self.font_data.clone()
}
fn family_name(&self) -> String {
unsafe { string::raw::from_buf(&*(*self.face).family_name as *const i8 as *const u8) }
}
fn face_name(&self) -> String {
unsafe { string::raw::from_buf(&*FT_Get_Postscript_Name(self.face) as *const i8 as *const u8) }
}
fn is_italic(&self) -> bool {
unsafe { (*self.face).style_flags & FT_STYLE_FLAG_ITALIC != 0 }
}
fn boldness(&self) -> font_weight::T {
let default_weight = font_weight::Weight400;
if unsafe { (*self.face).style_flags & FT_STYLE_FLAG_BOLD == 0 } {
default_weight
} else {
unsafe {
let os2 = FT_Get_Sfnt_Table(self.face, ft_sfnt_os2) as *mut TT_OS2;
let valid = os2.is_not_null() && (*os2).version != 0xffff;
if valid {
let weight =(*os2).usWeightClass;
match weight {
1 | 100..199 => font_weight::Weight100,
2 | 200..299 => font_weight::Weight200,
3 | 300..399 => font_weight::Weight300,
4 | 400..499 => font_weight::Weight400,
5 | 500..599 => font_weight::Weight500,
6 | 600..699 => font_weight::Weight600,
7 | 700..799 => font_weight::Weight700,
8 | 800..899 => font_weight::Weight800,
9 | 900..999 => font_weight::Weight900,
_ => default_weight
}
} else {
default_weight
}
}
}
}
fn glyph_index(&self,
codepoint: char) -> Option<GlyphId> {
assert!(self.face.is_not_null());
unsafe {
let idx = FT_Get_Char_Index(self.face, codepoint as FT_ULong);
return if idx != 0 as FT_UInt {
Some(idx as GlyphId)
} else {
debug!("Invalid codepoint: {}", codepoint);
None
};
}
}
fn glyph_h_kerning(&self, first_glyph: GlyphId, second_glyph: GlyphId)
-> FractionalPixel {
assert!(self.face.is_not_null());
let mut delta = struct_FT_Vector_ { x: 0, y: 0 };
unsafe {
FT_Get_Kerning(self.face, first_glyph, second_glyph, FT_KERNING_DEFAULT, &mut delta);
}
fixed_to_float_ft(delta.x as i32)
}
fn glyph_h_advance(&self,
glyph: GlyphId) -> Option<FractionalPixel> {
assert!(self.face.is_not_null());
unsafe {
let res = FT_Load_Glyph(self.face, glyph as FT_UInt, 0);
if res.succeeded() {
let void_glyph = (*self.face).glyph;
let slot: FT_GlyphSlot = mem::transmute(void_glyph);
assert!(slot.is_not_null());
debug!("metrics: {:?}", (*slot).metrics);
let advance = (*slot).metrics.horiAdvance;
debug!("h_advance for {} is {}", glyph, advance);
let advance = advance as i32;
return Some(fixed_to_float_ft(advance) as FractionalPixel);
} else {
debug!("Unable to load glyph {}. reason: {}", glyph, res);
return None;
}
}
}
fn get_metrics(&self) -> FontMetrics {
/* TODO(Issue #76): complete me */
let face = self.get_face_rec();
let underline_size = self.font_units_to_au(face.underline_thickness as f64);
let underline_offset = self.font_units_to_au(face.underline_position as f64);
let em_size = self.font_units_to_au(face.units_per_EM as f64);
let ascent = self.font_units_to_au(face.ascender as f64);
let descent = self.font_units_to_au(face.descender as f64);
let max_advance = self.font_units_to_au(face.max_advance_width as f64);
// 'leading' is supposed to be the vertical distance between two baselines,
// reflected by the height attibute in freetype. On OS X (w/ CTFont),
// leading represents the distance between the bottom of a line descent to
// the top of the next line's ascent or: (line_height - ascent - descent),
// see http://stackoverflow.com/a/5635981 for CTFont implementation.
// Convert using a formular similar to what CTFont returns for consistency.
let height = self.font_units_to_au(face.height as f64);
let leading = height - (ascent + descent);
let mut strikeout_size = geometry::from_pt(0.0);
let mut strikeout_offset = geometry::from_pt(0.0);
let mut x_height = geometry::from_pt(0.0);
unsafe {
let os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2) as *mut TT_OS2;
let valid = os2.is_not_null() && (*os2).version != 0xffff;
if valid {
strikeout_size = self.font_units_to_au((*os2).yStrikeoutSize as f64);
strikeout_offset = self.font_units_to_au((*os2).yStrikeoutPosition as f64);
x_height = self.font_units_to_au((*os2).sxHeight as f64);
}
}
let metrics = FontMetrics {
underline_size: underline_size,
underline_offset: underline_offset,
strikeout_size: strikeout_size,
strikeout_offset: strikeout_offset,
leading: leading,
x_height: x_height,
em_size: em_size,
ascent: ascent,
descent: -descent, // linux font's seem to use the opposite sign from mac
max_advance: max_advance,
line_gap: height,
};
debug!("Font metrics (@{:f} pt): {:?}", geometry::to_pt(em_size), metrics);
return metrics;
}
fn get_table_for_tag(&self, _: FontTableTag) -> Option<FontTable> {
None
}
}
impl<'a> FontHandle {
fn set_char_size(face: FT_Face, pt_size: f64) -> Result<(), ()>{
let char_width = float_to_fixed_ft(pt_size) as FT_F26Dot6;
let char_height = float_to_fixed_ft(pt_size) as FT_F26Dot6;
let h_dpi = 72;
let v_dpi = 72;
unsafe {
let result = FT_Set_Char_Size(face, char_width, char_height, h_dpi, v_dpi);
if result.succeeded() { Ok(()) } else { Err(()) }
}
}
fn get_face_rec(&'a self) -> &'a mut FT_FaceRec {
unsafe {
&mut (*self.face)
}
}
fn font_units_to_au(&self, value: f64) -> Au {
let face = self.get_face_rec();
// face.size is a *c_void in the bindings, presumably to avoid
// recursive structural types
let size: &FT_SizeRec = unsafe { mem::transmute(&(*face.size)) };
let metrics: &FT_Size_Metrics = &(*size).metrics;
let em_size = face.units_per_EM as f64;
let x_scale = (metrics.x_ppem as f64) / em_size as f64;
// If this isn't true then we're scaling one of the axes wrong
assert!(metrics.x_ppem == metrics.y_ppem);
return geometry::from_frac_px(value * x_scale);
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use freetype::freetype::FTErrorMethods;
use freetype::freetype::FT_Add_Default_Modules;
use freetype::freetype::FT_Done_FreeType;
use freetype::freetype::FT_Library;
use freetype::freetype::FT_Memory;
use freetype::freetype::FT_New_Library;
use freetype::freetype::struct_FT_MemoryRec_;
use std::ptr;
use std::rc::Rc;
use libc;
use libc::{c_void, c_long, size_t, malloc};
use std::mem;
extern fn ft_alloc(_mem: FT_Memory, size: c_long) -> *mut c_void {
unsafe {
let ptr = libc::malloc(size as size_t);
ptr as *mut c_void
}
}
extern fn ft_free(_mem: FT_Memory, block: *mut c_void) {
unsafe {
libc::free(block);
}
}
extern fn ft_realloc(_mem: FT_Memory, _cur_size: c_long, new_size: c_long, block: *mut c_void) -> *mut c_void {
unsafe {
let ptr = libc::realloc(block, new_size as size_t);
ptr as *mut c_void
}
}
#[deriving(Clone)]
pub struct FreeTypeLibraryHandle {
pub ctx: FT_Library,
}
#[deriving(Clone)]
pub struct FontContextHandle {
pub ctx: Rc<FreeTypeLibraryHandle>,
}
impl Drop for FreeTypeLibraryHandle {
fn drop(&mut self) {
assert!(self.ctx.is_not_null());
unsafe { FT_Done_FreeType(self.ctx) };
}
}
impl FontContextHandle {
pub fn new() -> FontContextHandle {
unsafe {
let ptr = libc::malloc(mem::size_of::<struct_FT_MemoryRec_>() as size_t);
let allocator: &mut struct_FT_MemoryRec_ = mem::transmute(ptr);
ptr::write(allocator, struct_FT_MemoryRec_ {
user: ptr::mut_null(),
alloc: ft_alloc,
free: ft_free,
realloc: ft_realloc,
});
let mut ctx: FT_Library = ptr::mut_null();
let result = FT_New_Library(ptr as FT_Memory, &mut ctx);
if !result.succeeded() { fail!("Unable to initialize FreeType library"); }
FT_Add_Default_Modules(ctx);
FontContextHandle {
ctx: Rc::new(FreeTypeLibraryHandle { ctx: ctx }),
}
}
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#![allow(uppercase_variables)]
extern crate freetype;
extern crate fontconfig;
use fontconfig::fontconfig::{FcChar8, FcResultMatch, FcSetSystem};
use fontconfig::fontconfig::{
FcConfigGetCurrent, FcConfigGetFonts, FcPatternGetString,
FcPatternDestroy, FcFontSetDestroy,
FcPatternCreate, FcPatternAddString,
FcFontSetList, FcObjectSetCreate, FcObjectSetDestroy,
FcObjectSetAdd, FcPatternGetInteger
};
use libc;
use libc::c_int;
use std::ptr;
use std::string;
pub fn get_available_families(callback: |String|) {
unsafe {
let config = FcConfigGetCurrent();
let fontSet = FcConfigGetFonts(config, FcSetSystem);
for i in range(0, (*fontSet).nfont as int) {
let font = (*fontSet).fonts.offset(i);
let mut family: *mut FcChar8 = ptr::mut_null();
let mut v: c_int = 0;
let mut FC_FAMILY_C = "family".to_c_str();
let FC_FAMILY = FC_FAMILY_C.as_mut_ptr();
while FcPatternGetString(*font, FC_FAMILY, v, &mut family) == FcResultMatch {
let family_name = string::raw::from_buf(family as *const i8 as *const u8);
callback(family_name);
v += 1;
}
}
}
}
pub fn get_variations_for_family(family_name: &str, callback: |String|) {
debug!("getting variations for {}", family_name);
unsafe {
let config = FcConfigGetCurrent();
let mut font_set = FcConfigGetFonts(config, FcSetSystem);
let font_set_array_ptr = &mut font_set;
let pattern = FcPatternCreate();
assert!(pattern.is_not_null());
let mut FC_FAMILY_C = "family".to_c_str();
let FC_FAMILY = FC_FAMILY_C.as_mut_ptr();
let mut family_name_c = family_name.to_c_str();
let family_name = family_name_c.as_mut_ptr();
let ok = FcPatternAddString(pattern, FC_FAMILY, family_name as *mut FcChar8);
assert!(ok != 0);
let object_set = FcObjectSetCreate();
assert!(object_set.is_not_null());
let mut FC_FILE_C = "file".to_c_str();
let FC_FILE = FC_FILE_C.as_mut_ptr();
FcObjectSetAdd(object_set, FC_FILE);
let mut FC_INDEX_C = "index".to_c_str();
let FC_INDEX = FC_INDEX_C.as_mut_ptr();
FcObjectSetAdd(object_set, FC_INDEX);
let matches = FcFontSetList(config, font_set_array_ptr, 1, pattern, object_set);
debug!("found {} variations", (*matches).nfont);
for i in range(0, (*matches).nfont as int) {
let font = (*matches).fonts.offset(i);
let mut FC_FILE_C = "file".to_c_str();
let FC_FILE = FC_FILE_C.as_mut_ptr();
let mut file: *mut FcChar8 = ptr::mut_null();
let file = if FcPatternGetString(*font, FC_FILE, 0, &mut file) == FcResultMatch {
string::raw::from_buf(file as *const i8 as *const u8)
} else {
fail!();
};
let mut FC_INDEX_C = "index".to_c_str();
let FC_INDEX = FC_INDEX_C.as_mut_ptr();
let mut index: libc::c_int = 0;
let index = if FcPatternGetInteger(*font, FC_INDEX, 0, &mut index) == FcResultMatch {
index
} else {
fail!();
};
debug!("variation file: {}", file);
debug!("variation index: {}", index);
callback(file);
}
FcFontSetDestroy(matches);
FcPatternDestroy(pattern);
FcObjectSetDestroy(object_set);
}
}
#[cfg(target_os="linux")]
pub fn get_last_resort_font_families() -> Vec<String> {
vec!(
"Fira Sans".to_string(),
"DejaVu Sans".to_string(),
"Arial".to_string()
)
}
#[cfg(target_os="android")]
pub fn get_last_resort_font_families() -> Vec<String> {
vec!("Roboto".to_string())
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::io;
use std::io::File;
/// Platform specific font representation for Linux.
/// The identifier is an absolute path, and the bytes
/// field is the loaded data that can be passed to
/// freetype and azure directly.
pub struct FontTemplateData {
pub bytes: Vec<u8>,
pub identifier: String,
}
impl FontTemplateData {
pub fn new(identifier: &str, font_data: Option<Vec<u8>>) -> FontTemplateData {
let bytes = match font_data {
Some(bytes) => {
bytes
},
None => {
// TODO: Handle file load failure!
let mut file = File::open_mode(&Path::new(identifier), io::Open, io::Read).unwrap();
file.read_to_end().unwrap()
},
};
FontTemplateData {
bytes: bytes,
identifier: identifier.to_string(),
}
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/// Implementation of Quartz (CoreGraphics) fonts.
extern crate core_foundation;
extern crate core_graphics;
extern crate core_text;
use font::{FontHandleMethods, FontMetrics, FontTableMethods};
use font::FontTableTag;
use font::FractionalPixel;
use servo_util::geometry::{Au, px_to_pt};
use servo_util::geometry;
use platform::macos::font_context::FontContextHandle;
use text::glyph::GlyphId;
use style::computed_values::font_weight;
use platform::font_template::FontTemplateData;
use core_foundation::base::CFIndex;
use core_foundation::data::CFData;
use core_foundation::string::UniChar;
use core_graphics::font::CGGlyph;
use core_graphics::geometry::CGRect;
use core_text::font::CTFont;
use core_text::font_descriptor::{SymbolicTraitAccessors, TraitAccessors};
use core_text::font_descriptor::{kCTFontDefaultOrientation};
use std::ptr;
use sync::Arc;
pub struct FontTable {
data: CFData,
}
// Noncopyable.
impl Drop for FontTable {
fn drop(&mut self) {}
}
impl FontTable {
pub fn wrap(data: CFData) -> FontTable {
FontTable { data: data }
}
}
impl FontTableMethods for FontTable {
fn with_buffer(&self, blk: |*const u8, uint|) {
blk(self.data.bytes().as_ptr(), self.data.len() as uint);
}
}
pub struct FontHandle {
pub font_data: Arc<FontTemplateData>,
pub ctfont: CTFont,
}
impl FontHandleMethods for FontHandle {
fn new_from_template(_fctx: &FontContextHandle,
template: Arc<FontTemplateData>,
pt_size: Option<f64>)
-> Result<FontHandle, ()> {
let size = match pt_size {
Some(s) => s,
None => 0.0
};
match template.ctfont {
Some(ref ctfont) => {
Ok(FontHandle {
font_data: template.clone(),
ctfont: ctfont.clone_with_font_size(size),
})
}
None => {
Err(())
}
}
}
fn get_template(&self) -> Arc<FontTemplateData> {
self.font_data.clone()
}
fn family_name(&self) -> String {
self.ctfont.family_name()
}
fn face_name(&self) -> String {
self.ctfont.face_name()
}
fn is_italic(&self) -> bool {
self.ctfont.symbolic_traits().is_italic()
}
fn boldness(&self) -> font_weight::T {
// -1.0 to 1.0
let normalized = self.ctfont.all_traits().normalized_weight();
// 0.0 to 9.0
let normalized = (normalized + 1.0) / 2.0 * 9.0;
if normalized < 1.0 { return font_weight::Weight100; }
if normalized < 2.0 { return font_weight::Weight200; }
if normalized < 3.0 { return font_weight::Weight300; }
if normalized < 4.0 { return font_weight::Weight400; }
if normalized < 5.0 { return font_weight::Weight500; }
if normalized < 6.0 { return font_weight::Weight600; }
if normalized < 7.0 { return font_weight::Weight700; }
if normalized < 8.0 { return font_weight::Weight800; }
return font_weight::Weight900;
}
fn glyph_index(&self, codepoint: char) -> Option<GlyphId> {
let characters: [UniChar, ..1] = [codepoint as UniChar];
let mut glyphs: [CGGlyph, ..1] = [0 as CGGlyph];
let count: CFIndex = 1;
let result = self.ctfont.get_glyphs_for_characters(&characters[0],
&mut glyphs[0],
count);
if !result {
// No glyph for this character
return None;
}
assert!(glyphs[0] != 0); // FIXME: error handling
return Some(glyphs[0] as GlyphId);
}
fn glyph_h_kerning(&self, _first_glyph: GlyphId, _second_glyph: GlyphId)
-> FractionalPixel {
// TODO: Implement on mac
0.0
}
fn glyph_h_advance(&self, glyph: GlyphId) -> Option<FractionalPixel> {
let glyphs = [glyph as CGGlyph];
let advance = self.ctfont.get_advances_for_glyphs(kCTFontDefaultOrientation,
&glyphs[0],
ptr::mut_null(),
1);
Some(advance as FractionalPixel)
}
fn get_metrics(&self) -> FontMetrics {
let bounding_rect: CGRect = self.ctfont.bounding_box();
let ascent = self.ctfont.ascent() as f64;
let descent = self.ctfont.descent() as f64;
let em_size = Au::from_frac_px(self.ctfont.pt_size() as f64);
let leading = self.ctfont.leading() as f64;
let scale = px_to_pt(self.ctfont.pt_size() as f64) / (ascent + descent);
let line_gap = (ascent + descent + leading + 0.5).floor();
let metrics = FontMetrics {
underline_size: Au::from_pt(self.ctfont.underline_thickness() as f64),
// TODO(Issue #201): underline metrics are not reliable. Have to pull out of font table
// directly.
//
// see also: https://bugs.webkit.org/show_bug.cgi?id=16768
// see also: https://bugreports.qt-project.org/browse/QTBUG-13364
underline_offset: Au::from_pt(self.ctfont.underline_position() as f64),
strikeout_size: geometry::from_pt(0.0), // FIXME(Issue #942)
strikeout_offset: geometry::from_pt(0.0), // FIXME(Issue #942)
leading: Au::from_pt(leading),
x_height: Au::from_pt(self.ctfont.x_height() as f64),
em_size: em_size,
ascent: Au::from_pt(ascent * scale),
descent: Au::from_pt(descent * scale),
max_advance: Au::from_pt(bounding_rect.size.width as f64),
line_gap: Au::from_frac_px(line_gap),
};
debug!("Font metrics (@{:f} pt): {:?}", self.ctfont.pt_size() as f64, metrics);
return metrics;
}
fn get_table_for_tag(&self, tag: FontTableTag) -> Option<FontTable> {
let result: Option<CFData> = self.ctfont.get_font_table(tag);
result.and_then(|data| {
Some(FontTable::wrap(data))
})
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#[deriving(Clone)]
pub struct FontContextHandle {
ctx: ()
}
#[deriving(Clone)]
impl FontContextHandle {
// this is a placeholder until NSFontManager or whatever is bound in here.
pub fn new() -> FontContextHandle {
FontContextHandle { ctx: () }
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use core_foundation::base::TCFType;
use core_foundation::string::{CFString, CFStringRef};
use core_text::font_descriptor::{CTFontDescriptor, CTFontDescriptorRef};
use core_text;
use std::mem;
pub fn get_available_families(callback: |String|) {
let family_names = core_text::font_collection::get_family_names();
for strref in family_names.iter() {
let family_name_ref: CFStringRef = unsafe { mem::transmute(strref) };
let family_name_cf: CFString = unsafe { TCFType::wrap_under_get_rule(family_name_ref) };
let family_name = family_name_cf.to_string();
callback(family_name);
}
}
pub fn get_variations_for_family(family_name: &str, callback: |String|) {
debug!("Looking for faces of family: {:s}", family_name);
let family_collection =
core_text::font_collection::create_for_family(family_name.as_slice());
let family_descriptors = family_collection.get_descriptors();
for descref in family_descriptors.iter() {
let descref: CTFontDescriptorRef = unsafe { mem::transmute(descref) };
let desc: CTFontDescriptor = unsafe { TCFType::wrap_under_get_rule(descref) };
let postscript_name = desc.font_name();
callback(postscript_name);
}
}
pub fn get_last_resort_font_families() -> Vec<String> {
vec!("Arial Unicode MS".to_string(), "Arial".to_string())
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use core_graphics::data_provider::CGDataProvider;
use core_graphics::font::CGFont;
use core_text::font::CTFont;
use core_text;
/// Platform specific font representation for mac.
/// The identifier is a PostScript font name. The
/// CTFont object is cached here for use by the
/// render functions that create CGFont references.
pub struct FontTemplateData {
pub ctfont: Option<CTFont>,
pub identifier: String,
}
impl FontTemplateData {
pub fn new(identifier: &str, font_data: Option<Vec<u8>>) -> FontTemplateData {
let ctfont = match font_data {
Some(bytes) => {
let fontprov = CGDataProvider::from_buffer(bytes.as_slice());
let cgfont_result = CGFont::from_data_provider(fontprov);
match cgfont_result {
Ok(cgfont) => Some(core_text::font::new_from_CGFont(&cgfont, 0.0)),
Err(_) => None
}
},
None => {
Some(core_text::font::new_from_name(identifier.as_slice(), 0.0).unwrap())
}
};
FontTemplateData {
ctfont: ctfont,
identifier: identifier.to_string(),
}
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#[cfg(target_os="linux")]
#[cfg(target_os="android")]
pub use platform::freetype::{font, font_context, font_list, font_template};
#[cfg(target_os="macos")]
pub use platform::macos::{font, font_context, font_list, font_template};
#[cfg(target_os="linux")]
#[cfg(target_os="android")]
pub mod freetype {
pub mod font;
pub mod font_context;
pub mod font_list;
pub mod font_template;
}
#[cfg(target_os="macos")]
pub mod macos {
pub mod font;
pub mod font_context;
pub mod font_list;
pub mod font_template;
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use font_context::FontContext;
use style::computed_values::border_style;
use azure::azure_hl::{B8G8R8A8, A8, Color, ColorPattern, DrawOptions, DrawSurfaceOptions, DrawTarget};
use azure::azure_hl::{Linear, SourceOp, StrokeOptions};
use azure::AZ_CAP_BUTT;
use azure::AzFloat;
use geom::point::Point2D;
use geom::rect::Rect;
use geom::size::Size2D;
use geom::side_offsets::SideOffsets2D;
use libc::types::common::c99::uint16_t;
use libc::size_t;
use png::{RGB8, RGBA8, K8, KA8};
use servo_net::image::base::Image;
use servo_util::geometry::Au;
use servo_util::opts::Opts;
use sync::Arc;
pub struct RenderContext<'a> {
pub draw_target: &'a DrawTarget,
pub font_ctx: &'a mut Box<FontContext>,
pub opts: &'a Opts,
/// The rectangle that this context encompasses in page coordinates.
pub page_rect: Rect<f32>,
/// The rectangle that this context encompasses in screen coordinates (pixels).
pub screen_rect: Rect<uint>,
}
enum Direction {
Top,
Left,
Right,
Bottom
}
enum DashSize {
DottedBorder = 1,
DashedBorder = 3
}
impl<'a> RenderContext<'a> {
pub fn get_draw_target(&self) -> &'a DrawTarget {
self.draw_target
}
pub fn draw_solid_color(&self, bounds: &Rect<Au>, color: Color) {
self.draw_target.make_current();
self.draw_target.fill_rect(&bounds.to_azure_rect(), &ColorPattern::new(color), None);
}
pub fn draw_border(&self,
bounds: &Rect<Au>,
border: SideOffsets2D<Au>,
color: SideOffsets2D<Color>,
style: SideOffsets2D<border_style::T>) {
let border = border.to_float_px();
self.draw_target.make_current();
self.draw_border_segment(Top, bounds, border, color, style);
self.draw_border_segment(Right, bounds, border, color, style);
self.draw_border_segment(Bottom, bounds, border, color, style);
self.draw_border_segment(Left, bounds, border, color, style);
}
pub fn draw_line(&self,
bounds: &Rect<Au>,
color: Color,
style: border_style::T) {
self.draw_target.make_current();
self.draw_line_segment(bounds, color, style);
}
pub fn draw_push_clip(&self, bounds: &Rect<Au>) {
let rect = bounds.to_azure_rect();
let path_builder = self.draw_target.create_path_builder();
let left_top = Point2D(rect.origin.x, rect.origin.y);
let right_top = Point2D(rect.origin.x + rect.size.width, rect.origin.y);
let left_bottom = Point2D(rect.origin.x, rect.origin.y + rect.size.height);
let right_bottom = Point2D(rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);
path_builder.move_to(left_top);
path_builder.line_to(right_top);
path_builder.line_to(right_bottom);
path_builder.line_to(left_bottom);
let path = path_builder.finish();
self.draw_target.push_clip(&path);
}
pub fn draw_pop_clip(&self) {
self.draw_target.pop_clip();
}
pub fn draw_image(&self, bounds: Rect<Au>, image: Arc<Box<Image>>) {
let size = Size2D(image.width as i32, image.height as i32);
let (pixel_width, pixels, source_format) = match image.pixels {
RGBA8(ref pixels) => (4, pixels.as_slice(), B8G8R8A8),
K8(ref pixels) => (1, pixels.as_slice(), A8),
RGB8(_) => fail!("RGB8 color type not supported"),
KA8(_) => fail!("KA8 color type not supported"),
};
let stride = image.width * pixel_width;
self.draw_target.make_current();
let draw_target_ref = &self.draw_target;
let azure_surface = draw_target_ref.create_source_surface_from_data(pixels,
size,
stride as i32,
source_format);
let source_rect = Rect(Point2D(0u as AzFloat, 0u as AzFloat),
Size2D(image.width as AzFloat, image.height as AzFloat));
let dest_rect = bounds.to_azure_rect();
let draw_surface_options = DrawSurfaceOptions::new(Linear, true);
let draw_options = DrawOptions::new(1.0f64 as AzFloat, 0);
draw_target_ref.draw_surface(azure_surface,
dest_rect,
source_rect,
draw_surface_options,
draw_options);
}
pub fn clear(&self) {
let pattern = ColorPattern::new(Color::new(0.0, 0.0, 0.0, 0.0));
let rect = Rect(Point2D(self.page_rect.origin.x as AzFloat,
self.page_rect.origin.y as AzFloat),
Size2D(self.screen_rect.size.width as AzFloat,
self.screen_rect.size.height as AzFloat));
let mut draw_options = DrawOptions::new(1.0, 0);
draw_options.set_composition_op(SourceOp);
self.draw_target.make_current();
self.draw_target.fill_rect(&rect, &pattern, Some(&draw_options));
}
fn draw_border_segment(&self, direction: Direction, bounds: &Rect<Au>, border: SideOffsets2D<f32>, color: SideOffsets2D<Color>, style: SideOffsets2D<border_style::T>) {
let (style_select, color_select) = match direction {
Top => (style.top, color.top),
Left => (style.left, color.left),
Right => (style.right, color.right),
Bottom => (style.bottom, color.bottom)
};
match style_select{
border_style::none => {
}
border_style::hidden => {
}
//FIXME(sammykim): This doesn't work with dash_pattern and cap_style well. I referred firefox code.
border_style::dotted => {
self.draw_dashed_border_segment(direction, bounds, border, color_select, DottedBorder);
}
border_style::dashed => {
self.draw_dashed_border_segment(direction, bounds, border, color_select, DashedBorder);
}
border_style::solid => {
self.draw_solid_border_segment(direction,bounds,border,color_select);
}
border_style::double => {
self.draw_double_border_segment(direction, bounds, border, color_select);
}
border_style::groove | border_style::ridge => {
self.draw_groove_ridge_border_segment(direction, bounds, border, color_select, style_select);
}
border_style::inset | border_style::outset => {
self.draw_inset_outset_border_segment(direction, bounds, border, style_select, color_select);
}
}
}
fn draw_line_segment(&self, bounds: &Rect<Au>, color: Color, style: border_style::T) {
let border = SideOffsets2D::new_all_same(bounds.size.width).to_float_px();
match style{
border_style::none | border_style::hidden => {}
border_style::dotted => {
self.draw_dashed_border_segment(Right, bounds, border, color, DottedBorder);
}
border_style::dashed => {
self.draw_dashed_border_segment(Right, bounds, border, color, DashedBorder);
}
border_style::solid => {
self.draw_solid_border_segment(Right,bounds,border,color);
}
border_style::double => {
self.draw_double_border_segment(Right, bounds, border, color);
}
border_style::groove | border_style::ridge => {
self.draw_groove_ridge_border_segment(Right, bounds, border, color, style);
}
border_style::inset | border_style::outset => {
self.draw_inset_outset_border_segment(Right, bounds, border, style, color);
}
}
}
fn draw_border_path(&self,
bounds: Rect<f32>,
direction: Direction,
border: SideOffsets2D<f32>,
color: Color) {
let left_top = bounds.origin;
let right_top = left_top + Point2D(bounds.size.width, 0.0);
let left_bottom = left_top + Point2D(0.0, bounds.size.height);
let right_bottom = left_top + Point2D(bounds.size.width, bounds.size.height);
let draw_opts = DrawOptions::new(1.0, 0);
let path_builder = self.draw_target.create_path_builder();
match direction {
Top => {
path_builder.move_to(left_top);
path_builder.line_to(right_top);
path_builder.line_to(right_top + Point2D(-border.right, border.top));
path_builder.line_to(left_top + Point2D(border.left, border.top));
}
Left => {
path_builder.move_to(left_top);
path_builder.line_to(left_top + Point2D(border.left, border.top));
path_builder.line_to(left_bottom + Point2D(border.left, -border.bottom));
path_builder.line_to(left_bottom);
}
Right => {
path_builder.move_to(right_top);
path_builder.line_to(right_bottom);
path_builder.line_to(right_bottom + Point2D(-border.right, -border.bottom));
path_builder.line_to(right_top + Point2D(-border.right, border.top));
}
Bottom => {
path_builder.move_to(left_bottom);
path_builder.line_to(left_bottom + Point2D(border.left, -border.bottom));
path_builder.line_to(right_bottom + Point2D(-border.right, -border.bottom));
path_builder.line_to(right_bottom);
}
}
let path = path_builder.finish();
self.draw_target.fill(&path, &ColorPattern::new(color), &draw_opts);
}
fn draw_dashed_border_segment(&self,
direction: Direction,
bounds: &Rect<Au>,
border: SideOffsets2D<f32>,
color: Color,
dash_size: DashSize) {
let rect = bounds.to_azure_rect();
let draw_opts = DrawOptions::new(1u as AzFloat, 0 as uint16_t);
let mut stroke_opts = StrokeOptions::new(0u as AzFloat, 10u as AzFloat);
let mut dash: [AzFloat, ..2] = [0u as AzFloat, 0u as AzFloat];
stroke_opts.set_cap_style(AZ_CAP_BUTT as u8);
let border_width = match direction {
Top => border.top,
Left => border.left,
Right => border.right,
Bottom => border.bottom
};
stroke_opts.line_width = border_width;
dash[0] = border_width * (dash_size as int) as AzFloat;
dash[1] = border_width * (dash_size as int) as AzFloat;
stroke_opts.mDashPattern = dash.as_mut_ptr();
stroke_opts.mDashLength = dash.len() as size_t;
let (start, end) = match direction {
Top => {
let y = rect.origin.y + border.top * 0.5;
let start = Point2D(rect.origin.x, y);
let end = Point2D(rect.origin.x + rect.size.width, y);
(start, end)
}
Left => {
let x = rect.origin.x + border.left * 0.5;
let start = Point2D(x, rect.origin.y + rect.size.height);
let end = Point2D(x, rect.origin.y + border.top);
(start, end)
}
Right => {
let x = rect.origin.x + rect.size.width - border.right * 0.5;
let start = Point2D(x, rect.origin.y);
let end = Point2D(x, rect.origin.y + rect.size.height);
(start, end)
}
Bottom => {
let y = rect.origin.y + rect.size.height - border.bottom * 0.5;
let start = Point2D(rect.origin.x + rect.size.width, y);
let end = Point2D(rect.origin.x + border.left, y);
(start, end)
}
};
self.draw_target.stroke_line(start,
end,
&ColorPattern::new(color),
&stroke_opts,
&draw_opts);
}
fn draw_solid_border_segment(&self, direction: Direction, bounds: &Rect<Au>, border: SideOffsets2D<f32>, color: Color) {
let rect = bounds.to_azure_rect();
self.draw_border_path(rect, direction, border, color);
}
fn get_scaled_bounds(&self,
bounds: &Rect<Au>,
border: SideOffsets2D<f32>,
shrink_factor: f32) -> Rect<f32> {
let rect = bounds.to_azure_rect();
let scaled_border = SideOffsets2D::new(shrink_factor * border.top,
shrink_factor * border.right,
shrink_factor * border.bottom,
shrink_factor * border.left);
let left_top = Point2D(rect.origin.x, rect.origin.y);
let scaled_left_top = left_top + Point2D(scaled_border.left,
scaled_border.top);
return Rect(scaled_left_top,
Size2D(rect.size.width - 2.0 * scaled_border.right, rect.size.height - 2.0 * scaled_border.bottom));
}
fn scale_color(&self, color: Color, scale_factor: f32) -> Color {
return Color::new(color.r * scale_factor, color.g * scale_factor, color.b * scale_factor, color.a);
}
fn draw_double_border_segment(&self, direction: Direction, bounds: &Rect<Au>, border: SideOffsets2D<f32>, color: Color) {
let scaled_border = SideOffsets2D::new((1.0/3.0) * border.top,
(1.0/3.0) * border.right,
(1.0/3.0) * border.bottom,
(1.0/3.0) * border.left);
let inner_scaled_bounds = self.get_scaled_bounds(bounds, border, 2.0/3.0);
// draw the outer portion of the double border.
self.draw_solid_border_segment(direction, bounds, scaled_border, color);
// draw the inner portion of the double border.
self.draw_border_path(inner_scaled_bounds, direction, scaled_border, color);
}
fn draw_groove_ridge_border_segment(&self,
direction: Direction,
bounds: &Rect<Au>,
border: SideOffsets2D<f32>,
color: Color,
style: border_style::T) {
// original bounds as a Rect<f32>, with no scaling.
let original_bounds = self.get_scaled_bounds(bounds, border, 0.0);
// shrink the bounds by 1/2 of the border, leaving the innermost 1/2 of the border
let inner_scaled_bounds = self.get_scaled_bounds(bounds, border, 0.5);
let scaled_border = SideOffsets2D::new(0.5 * border.top,
0.5 * border.right,
0.5 * border.bottom,
0.5 * border.left);
let is_groove = match style {
border_style::groove => true,
border_style::ridge => false,
_ => fail!("invalid border style")
};
let darker_color = self.scale_color(color, if is_groove { 1.0/3.0 } else { 2.0/3.0 });
let (outer_color, inner_color) = match (direction, is_groove) {
(Top, true) | (Left, true) | (Right, false) | (Bottom, false) => (darker_color, color),
(Top, false) | (Left, false) | (Right, true) | (Bottom, true) => (color, darker_color)
};
// outer portion of the border
self.draw_border_path(original_bounds, direction, scaled_border, outer_color);
// inner portion of the border
self.draw_border_path(inner_scaled_bounds, direction, scaled_border, inner_color);
}
fn draw_inset_outset_border_segment(&self,
direction: Direction,
bounds: &Rect<Au>,
border: SideOffsets2D<f32>,
style: border_style::T,
color: Color) {
let is_inset = match style {
border_style::inset => true,
border_style::outset => false,
_ => fail!("invalid border style")
};
// original bounds as a Rect<f32>
let original_bounds = self.get_scaled_bounds(bounds, border, 0.0);
// select and scale the color appropriately.
let scaled_color = match direction {
Top => self.scale_color(color, if is_inset { 2.0/3.0 } else { 1.0 }),
Left => self.scale_color(color, if is_inset { 1.0/6.0 } else { 0.5 }),
Right | Bottom => self.scale_color(color, if is_inset { 1.0 } else { 2.0/3.0 })
};
self.draw_border_path(original_bounds, direction, border, scaled_color);
}
}
trait ToAzureRect {
fn to_azure_rect(&self) -> Rect<AzFloat>;
}
impl ToAzureRect for Rect<Au> {
fn to_azure_rect(&self) -> Rect<AzFloat> {
Rect(Point2D(self.origin.x.to_nearest_px() as AzFloat,
self.origin.y.to_nearest_px() as AzFloat),
Size2D(self.size.width.to_nearest_px() as AzFloat,
self.size.height.to_nearest_px() as AzFloat))
}
}
trait ToSideOffsetsPx {
fn to_float_px(&self) -> SideOffsets2D<AzFloat>;
}
impl ToSideOffsetsPx for SideOffsets2D<Au> {
fn to_float_px(&self) -> SideOffsets2D<AzFloat> {
SideOffsets2D::new(self.top.to_nearest_px() as AzFloat,
self.right.to_nearest_px() as AzFloat,
self.bottom.to_nearest_px() as AzFloat,
self.left.to_nearest_px() as AzFloat)
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! The task that handles all rendering/painting.
use buffer_map::BufferMap;
use display_list::optimizer::DisplayListOptimizer;
use display_list::DisplayList;
use font_context::FontContext;
use render_context::RenderContext;
use azure::azure_hl::{B8G8R8A8, Color, DrawTarget, StolenGLResources};
use azure::AzFloat;
use geom::matrix2d::Matrix2D;
use geom::rect::Rect;
use geom::size::Size2D;
use layers::platform::surface::{NativePaintingGraphicsContext, NativeSurface};
use layers::platform::surface::{NativeSurfaceMethods};
use layers::layers::{BufferRequest, LayerBuffer, LayerBufferSet};
use layers;
use servo_msg::compositor_msg::{Epoch, IdleRenderState, LayerId};
use servo_msg::compositor_msg::{LayerMetadata, RenderListener, RenderingRenderState, ScrollPolicy};
use servo_msg::constellation_msg::{ConstellationChan, Failure, FailureMsg, PipelineId};
use servo_msg::constellation_msg::{RendererReadyMsg};
use servo_msg::platform::surface::NativeSurfaceAzureMethods;
use servo_util::geometry;
use servo_util::opts::Opts;
use servo_util::smallvec::{SmallVec, SmallVec1};
use servo_util::task::spawn_named_with_send_on_failure;
use servo_util::time::{TimeProfilerChan, profile};
use servo_util::time;
use std::comm::{Receiver, Sender, channel};
use sync::Arc;
use font_cache_task::FontCacheTask;
/// Information about a layer that layout sends to the painting task.
pub struct RenderLayer {
/// A per-pipeline ID describing this layer that should be stable across reflows.
pub id: LayerId,
/// The display list describing the contents of this layer.
pub display_list: Arc<DisplayList>,
/// The position of the layer in pixels.
pub position: Rect<uint>,
/// The color of the background in this layer. Used for unrendered content.
pub background_color: Color,
/// The scrolling policy of this layer.
pub scroll_policy: ScrollPolicy,
}
pub struct RenderRequest {
pub buffer_requests: Vec<BufferRequest>,
pub scale: f32,
pub layer_id: LayerId,
pub epoch: Epoch,
}
pub enum Msg {
RenderInitMsg(SmallVec1<RenderLayer>),
RenderMsg(Vec<RenderRequest>),
UnusedBufferMsg(Vec<Box<LayerBuffer>>),
PaintPermissionGranted,
PaintPermissionRevoked,
ExitMsg(Option<Sender<()>>),
}
#[deriving(Clone)]
pub struct RenderChan(Sender<Msg>);
impl RenderChan {
pub fn new() -> (Receiver<Msg>, RenderChan) {
let (chan, port) = channel();
(port, RenderChan(chan))
}
pub fn send(&self, msg: Msg) {
let &RenderChan(ref chan) = self;
assert!(chan.send_opt(msg).is_ok(), "RenderChan.send: render port closed")
}
pub fn send_opt(&self, msg: Msg) -> Result<(), Msg> {
let &RenderChan(ref chan) = self;
chan.send_opt(msg)
}
}
/// If we're using GPU rendering, this provides the metadata needed to create a GL context that
/// is compatible with that of the main thread.
pub enum GraphicsContext {
CpuGraphicsContext,
GpuGraphicsContext,
}
pub struct RenderTask<C> {
id: PipelineId,
port: Receiver<Msg>,
compositor: C,
constellation_chan: ConstellationChan,
font_ctx: Box<FontContext>,
opts: Opts,
/// A channel to the time profiler.
time_profiler_chan: TimeProfilerChan,
/// The graphics context to use.
graphics_context: GraphicsContext,
/// The native graphics context.
native_graphics_context: Option<NativePaintingGraphicsContext>,
/// The layers to be rendered.
render_layers: SmallVec1<RenderLayer>,
/// Permission to send paint messages to the compositor
paint_permission: bool,
/// A counter for epoch messages
epoch: Epoch,
/// A data structure to store unused LayerBuffers
buffer_map: BufferMap,
}
// If we implement this as a function, we get borrowck errors from borrowing
// the whole RenderTask struct.
macro_rules! native_graphics_context(
($task:expr) => (
$task.native_graphics_context.as_ref().expect("Need a graphics context to do rendering")
)
)
fn initialize_layers<C:RenderListener>(
compositor: &mut C,
pipeline_id: PipelineId,
epoch: Epoch,
render_layers: &[RenderLayer]) {
let metadata = render_layers.iter().map(|render_layer| {
LayerMetadata {
id: render_layer.id,
position: render_layer.position,
background_color: render_layer.background_color,
scroll_policy: render_layer.scroll_policy,
}
}).collect();
compositor.initialize_layers_for_pipeline(pipeline_id, metadata, epoch);
}
impl<C:RenderListener + Send> RenderTask<C> {
pub fn create(id: PipelineId,
port: Receiver<Msg>,
compositor: C,
constellation_chan: ConstellationChan,
font_cache_task: FontCacheTask,
failure_msg: Failure,
opts: Opts,
time_profiler_chan: TimeProfilerChan,
shutdown_chan: Sender<()>) {
let ConstellationChan(c) = constellation_chan.clone();
let fc = font_cache_task.clone();
spawn_named_with_send_on_failure("RenderTask", proc() {
{ // Ensures RenderTask and graphics context are destroyed before shutdown msg
let native_graphics_context = compositor.get_graphics_metadata().map(
|md| NativePaintingGraphicsContext::from_metadata(&md));
let cpu_painting = opts.cpu_painting;
// FIXME: rust/#5967
let mut render_task = RenderTask {
id: id,
port: port,
compositor: compositor,
constellation_chan: constellation_chan,
font_ctx: box FontContext::new(fc.clone()),
opts: opts,
time_profiler_chan: time_profiler_chan,
graphics_context: if cpu_painting {
CpuGraphicsContext
} else {
GpuGraphicsContext
},
native_graphics_context: native_graphics_context,
render_layers: SmallVec1::new(),
paint_permission: false,
epoch: Epoch(0),
buffer_map: BufferMap::new(10000000),
};
render_task.start();
// Destroy all the buffers.
match render_task.native_graphics_context.as_ref() {
Some(ctx) => render_task.buffer_map.clear(ctx),
None => (),
}
}
debug!("render_task: shutdown_chan send");
shutdown_chan.send(());
}, FailureMsg(failure_msg), c, true);
}
fn start(&mut self) {
debug!("render_task: beginning rendering loop");
loop {
match self.port.recv() {
RenderInitMsg(render_layers) => {
self.epoch.next();
self.render_layers = render_layers;
if !self.paint_permission {
debug!("render_task: render ready msg");
let ConstellationChan(ref mut c) = self.constellation_chan;
c.send(RendererReadyMsg(self.id));
continue;
}
initialize_layers(&mut self.compositor,
self.id,
self.epoch,
self.render_layers.as_slice());
}
RenderMsg(requests) => {
if !self.paint_permission {
debug!("render_task: render ready msg");
let ConstellationChan(ref mut c) = self.constellation_chan;
c.send(RendererReadyMsg(self.id));
self.compositor.render_msg_discarded();
continue;
}
self.compositor.set_render_state(RenderingRenderState);
let mut replies = Vec::new();
for RenderRequest { buffer_requests, scale, layer_id, epoch }
in requests.move_iter() {
if self.epoch == epoch {
self.render(&mut replies, buffer_requests, scale, layer_id);
} else {
debug!("renderer epoch mismatch: {:?} != {:?}", self.epoch, epoch);
}
}
self.compositor.set_render_state(IdleRenderState);
debug!("render_task: returning surfaces");
self.compositor.paint(self.id, self.epoch, replies);
}
UnusedBufferMsg(unused_buffers) => {
for buffer in unused_buffers.move_iter().rev() {
self.buffer_map.insert(native_graphics_context!(self), buffer);
}
}
PaintPermissionGranted => {
self.paint_permission = true;
// Here we assume that the main layer—the layer responsible for the page size—
// is the first layer. This is a pretty fragile assumption. It will be fixed
// once we use the layers-based scrolling infrastructure for all scrolling.
if self.render_layers.len() > 1 {
self.epoch.next();
initialize_layers(&mut self.compositor,
self.id,
self.epoch,
self.render_layers.as_slice());
}
}
PaintPermissionRevoked => {
self.paint_permission = false;
}
ExitMsg(response_ch) => {
debug!("render_task: exitmsg response send");
response_ch.map(|ch| ch.send(()));
break;
}
}
}
}
/// Renders one layer and sends the tiles back to the layer.
fn render(&mut self,
replies: &mut Vec<(LayerId, Box<LayerBufferSet>)>,
tiles: Vec<BufferRequest>,
scale: f32,
layer_id: LayerId) {
time::profile(time::RenderingCategory, self.time_profiler_chan.clone(), || {
// FIXME: Try not to create a new array here.
let mut new_buffers = vec!();
// Find the appropriate render layer.
let render_layer = match self.render_layers.iter().find(|layer| layer.id == layer_id) {
Some(render_layer) => render_layer,
None => return,
};
// Divide up the layer into tiles.
for tile in tiles.iter() {
// Optimize the display list for this tile.
let page_rect_au = geometry::f32_rect_to_au_rect(tile.page_rect);
let optimizer = DisplayListOptimizer::new(render_layer.display_list.clone(),
page_rect_au);
let display_list = optimizer.optimize();
let width = tile.screen_rect.size.width;
let height = tile.screen_rect.size.height;
let size = Size2D(width as i32, height as i32);
let draw_target = match self.graphics_context {
CpuGraphicsContext => {
DrawTarget::new(self.opts.render_backend, size, B8G8R8A8)
}
GpuGraphicsContext => {
// FIXME(pcwalton): Cache the components of draw targets
// (texture color buffer, renderbuffers) instead of recreating them.
let draw_target =
DrawTarget::new_with_fbo(self.opts.render_backend,
native_graphics_context!(self),
size,
B8G8R8A8);
draw_target.make_current();
draw_target
}
};
{
// Build the render context.
let mut ctx = RenderContext {
draw_target: &draw_target,
font_ctx: &mut self.font_ctx,
opts: &self.opts,
page_rect: tile.page_rect,
screen_rect: tile.screen_rect,
};
// Apply the translation to render the tile we want.
let matrix: Matrix2D<AzFloat> = Matrix2D::identity();
let matrix = matrix.scale(scale as AzFloat, scale as AzFloat);
let matrix = matrix.translate(-(tile.page_rect.origin.x) as AzFloat,
-(tile.page_rect.origin.y) as AzFloat);
let matrix = matrix.translate(-(render_layer.position.origin.x as AzFloat),
-(render_layer.position.origin.y as AzFloat));
ctx.draw_target.set_transform(&matrix);
// Clear the buffer.
ctx.clear();
// Draw the display list.
profile(time::RenderingDrawingCategory, self.time_profiler_chan.clone(), || {
display_list.draw_into_context(&mut ctx, &matrix);
ctx.draw_target.flush();
});
}
// Extract the texture from the draw target and place it into its slot in the
// buffer. If using CPU rendering, upload it first.
//
// FIXME(pcwalton): We should supply the texture and native surface *to* the
// draw target in GPU rendering mode, so that it doesn't have to recreate it.
let buffer = match self.graphics_context {
CpuGraphicsContext => {
let mut buffer = match self.buffer_map.find(tile.screen_rect.size) {
Some(buffer) => {
let mut buffer = buffer;
buffer.rect = tile.page_rect;
buffer.screen_pos = tile.screen_rect;
buffer.resolution = scale;
buffer.native_surface.mark_wont_leak();
buffer.painted_with_cpu = true;
buffer.content_age = tile.content_age;
buffer
}
None => {
// Create an empty native surface. We mark it as not leaking
// in case it dies in transit to the compositor task.
let mut native_surface: NativeSurface =
layers::platform::surface::NativeSurfaceMethods::new(
native_graphics_context!(self),
Size2D(width as i32, height as i32),
width as i32 * 4);
native_surface.mark_wont_leak();
box LayerBuffer {
native_surface: native_surface,
rect: tile.page_rect,
screen_pos: tile.screen_rect,
resolution: scale,
stride: (width * 4) as uint,
painted_with_cpu: true,
content_age: tile.content_age,
}
}
};
draw_target.snapshot().get_data_surface().with_data(|data| {
buffer.native_surface.upload(native_graphics_context!(self), data);
debug!("RENDERER uploading to native surface {:d}",
buffer.native_surface.get_id() as int);
});
buffer
}
GpuGraphicsContext => {
draw_target.make_current();
let StolenGLResources {
surface: native_surface
} = draw_target.steal_gl_resources().unwrap();
// We mark the native surface as not leaking in case the surfaces
// die on their way to the compositor task.
let mut native_surface: NativeSurface =
NativeSurfaceAzureMethods::from_azure_surface(native_surface);
native_surface.mark_wont_leak();
box LayerBuffer {
native_surface: native_surface,
rect: tile.page_rect,
screen_pos: tile.screen_rect,
resolution: scale,
stride: (width * 4) as uint,
painted_with_cpu: false,
content_age: tile.content_age,
}
}
};
new_buffers.push(buffer);
}
let layer_buffer_set = box LayerBufferSet {
buffers: new_buffers,
};
replies.push((render_layer.id, layer_buffer_set));
})
}
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use servo_util::vec::*;
use servo_util::range;
use servo_util::range::{Range, RangeIndex, IntRangeIndex, EachIndex};
use servo_util::geometry::Au;
use std::cmp::{PartialOrd, PartialEq};
use std::num::{NumCast, Zero};
use std::mem;
use std::u16;
use std::vec::Vec;
use geom::point::Point2D;
/// GlyphEntry is a port of Gecko's CompressedGlyph scheme for storing glyph data compactly.
///
/// In the common case (reasonable glyph advances, no offsets from the font em-box, and one glyph
/// per character), we pack glyph advance, glyph id, and some flags into a single u32.
///
/// In the uncommon case (multiple glyphs per unicode character, large glyph index/advance, or
/// glyph offsets), we pack the glyph count into GlyphEntry, and store the other glyph information
/// in DetailedGlyphStore.
#[deriving(Clone)]
struct GlyphEntry {
value: u32,
}
impl GlyphEntry {
fn new(value: u32) -> GlyphEntry {
GlyphEntry {
value: value,
}
}
fn initial() -> GlyphEntry {
GlyphEntry::new(0)
}
// Creates a GlyphEntry for the common case
fn simple(id: GlyphId, advance: Au) -> GlyphEntry {
assert!(is_simple_glyph_id(id));
assert!(is_simple_advance(advance));
let id_mask = id as u32;
let Au(advance) = advance;
let advance_mask = (advance as u32) << GLYPH_ADVANCE_SHIFT as uint;
GlyphEntry::new(id_mask | advance_mask | FLAG_IS_SIMPLE_GLYPH)
}
// Create a GlyphEntry for uncommon case; should be accompanied by
// initialization of the actual DetailedGlyph data in DetailedGlyphStore
fn complex(starts_cluster: bool, starts_ligature: bool, glyph_count: int) -> GlyphEntry {
assert!(glyph_count <= u16::MAX as int);
debug!("creating complex glyph entry: starts_cluster={}, starts_ligature={}, \
glyph_count={}",
starts_cluster,
starts_ligature,
glyph_count);
let mut val = FLAG_NOT_MISSING;
if !starts_cluster {
val |= FLAG_NOT_CLUSTER_START;
}
if !starts_ligature {
val |= FLAG_NOT_LIGATURE_GROUP_START;
}
val |= (glyph_count as u32) << GLYPH_COUNT_SHIFT as uint;
GlyphEntry::new(val)
}
/// Create a GlyphEntry for the case where glyphs couldn't be found for the specified
/// character.
fn missing(glyph_count: int) -> GlyphEntry {
assert!(glyph_count <= u16::MAX as int);
GlyphEntry::new((glyph_count as u32) << GLYPH_COUNT_SHIFT as uint)
}
}
/// The id of a particular glyph within a font
pub type GlyphId = u32;
// TODO: unify with bit flags?
#[deriving(PartialEq)]
pub enum BreakType {
BreakTypeNone,
BreakTypeNormal,
BreakTypeHyphen,
}
static BREAK_TYPE_NONE: u8 = 0x0;
static BREAK_TYPE_NORMAL: u8 = 0x1;
static BREAK_TYPE_HYPHEN: u8 = 0x2;
fn break_flag_to_enum(flag: u8) -> BreakType {
if (flag & BREAK_TYPE_NORMAL) != 0 {
BreakTypeNormal
} else if (flag & BREAK_TYPE_HYPHEN) != 0 {
BreakTypeHyphen
} else {
BreakTypeNone
}
}
fn break_enum_to_flag(e: BreakType) -> u8 {
match e {
BreakTypeNone => BREAK_TYPE_NONE,
BreakTypeNormal => BREAK_TYPE_NORMAL,
BreakTypeHyphen => BREAK_TYPE_HYPHEN,
}
}
// TODO: make this more type-safe.
static FLAG_CHAR_IS_SPACE: u32 = 0x10000000;
// These two bits store some BREAK_TYPE_* flags
static FLAG_CAN_BREAK_MASK: u32 = 0x60000000;
static FLAG_CAN_BREAK_SHIFT: u32 = 29;
static FLAG_IS_SIMPLE_GLYPH: u32 = 0x80000000;
// glyph advance; in Au's.
static GLYPH_ADVANCE_MASK: u32 = 0x0FFF0000;
static GLYPH_ADVANCE_SHIFT: u32 = 16;
static GLYPH_ID_MASK: u32 = 0x0000FFFF;
// Non-simple glyphs (more than one glyph per char; missing glyph,
// newline, tab, large advance, or nonzero x/y offsets) may have one
// or more detailed glyphs associated with them. They are stored in a
// side array so that there is a 1:1 mapping of GlyphEntry to
// unicode char.
// The number of detailed glyphs for this char. If the char couldn't
// be mapped to a glyph (!FLAG_NOT_MISSING), then this actually holds
// the UTF8 code point instead.
static GLYPH_COUNT_MASK: u32 = 0x00FFFF00;
static GLYPH_COUNT_SHIFT: u32 = 8;
// N.B. following Gecko, these are all inverted so that a lot of
// missing chars can be memset with zeros in one fell swoop.
static FLAG_NOT_MISSING: u32 = 0x00000001;
static FLAG_NOT_CLUSTER_START: u32 = 0x00000002;
static FLAG_NOT_LIGATURE_GROUP_START: u32 = 0x00000004;
static FLAG_CHAR_IS_TAB: u32 = 0x00000008;
static FLAG_CHAR_IS_NEWLINE: u32 = 0x00000010;
//static FLAG_CHAR_IS_LOW_SURROGATE: u32 = 0x00000020;
//static CHAR_IDENTITY_FLAGS_MASK: u32 = 0x00000038;
fn is_simple_glyph_id(id: GlyphId) -> bool {
((id as u32) & GLYPH_ID_MASK) == id
}
fn is_simple_advance(advance: Au) -> bool {
let unsignedAu = advance.to_u32().unwrap();
(unsignedAu & (GLYPH_ADVANCE_MASK >> GLYPH_ADVANCE_SHIFT as uint)) == unsignedAu
}
type DetailedGlyphCount = u16;
// Getters and setters for GlyphEntry. Setter methods are functional,
// because GlyphEntry is immutable and only a u32 in size.
impl GlyphEntry {
// getter methods
#[inline(always)]
fn advance(&self) -> Au {
NumCast::from((self.value & GLYPH_ADVANCE_MASK) >> GLYPH_ADVANCE_SHIFT as uint).unwrap()
}
fn id(&self) -> GlyphId {
self.value & GLYPH_ID_MASK
}
fn is_ligature_start(&self) -> bool {
self.has_flag(!FLAG_NOT_LIGATURE_GROUP_START)
}
fn is_cluster_start(&self) -> bool {
self.has_flag(!FLAG_NOT_CLUSTER_START)
}
// True if original char was normal (U+0020) space. Other chars may
// map to space glyph, but this does not account for them.
fn char_is_space(&self) -> bool {
self.has_flag(FLAG_CHAR_IS_SPACE)
}
fn char_is_tab(&self) -> bool {
!self.is_simple() && self.has_flag(FLAG_CHAR_IS_TAB)
}
fn char_is_newline(&self) -> bool {
!self.is_simple() && self.has_flag(FLAG_CHAR_IS_NEWLINE)
}
fn can_break_before(&self) -> BreakType {
let flag = ((self.value & FLAG_CAN_BREAK_MASK) >> FLAG_CAN_BREAK_SHIFT as uint) as u8;
break_flag_to_enum(flag)
}
// setter methods
#[inline(always)]
fn set_char_is_space(&self) -> GlyphEntry {
GlyphEntry::new(self.value | FLAG_CHAR_IS_SPACE)
}
#[inline(always)]
fn set_char_is_tab(&self) -> GlyphEntry {
assert!(!self.is_simple());
GlyphEntry::new(self.value | FLAG_CHAR_IS_TAB)
}
#[inline(always)]
fn set_char_is_newline(&self) -> GlyphEntry {
assert!(!self.is_simple());
GlyphEntry::new(self.value | FLAG_CHAR_IS_NEWLINE)
}
#[inline(always)]
fn set_can_break_before(&self, e: BreakType) -> GlyphEntry {
let flag = (break_enum_to_flag(e) as u32) << FLAG_CAN_BREAK_SHIFT as uint;
GlyphEntry::new(self.value | flag)
}
// helper methods
fn glyph_count(&self) -> u16 {
assert!(!self.is_simple());
((self.value & GLYPH_COUNT_MASK) >> GLYPH_COUNT_SHIFT as uint) as u16
}
#[inline(always)]
fn is_simple(&self) -> bool {
self.has_flag(FLAG_IS_SIMPLE_GLYPH)
}
#[inline(always)]
fn has_flag(&self, flag: u32) -> bool {
(self.value & flag) != 0
}
#[inline(always)]
fn adapt_character_flags_of_entry(&self, other: GlyphEntry) -> GlyphEntry {
GlyphEntry { value: self.value | other.value }
}
}
// Stores data for a detailed glyph, in the case that several glyphs
// correspond to one character, or the glyph's data couldn't be packed.
#[deriving(Clone)]
struct DetailedGlyph {
id: GlyphId,
// glyph's advance, in the text's direction (RTL or RTL)
advance: Au,
// glyph's offset from the font's em-box (from top-left)
offset: Point2D<Au>,
}
impl DetailedGlyph {
fn new(id: GlyphId, advance: Au, offset: Point2D<Au>) -> DetailedGlyph {
DetailedGlyph {
id: id,
advance: advance,
offset: offset,
}
}
}
#[deriving(PartialEq, Clone, Eq)]
struct DetailedGlyphRecord {
// source string offset/GlyphEntry offset in the TextRun
entry_offset: CharIndex,
// offset into the detailed glyphs buffer
detail_offset: int,
}
impl PartialOrd for DetailedGlyphRecord {
fn partial_cmp(&self, other: &DetailedGlyphRecord) -> Option<Ordering> {
self.entry_offset.partial_cmp(&other.entry_offset)
}
}
impl Ord for DetailedGlyphRecord {
fn cmp(&self, other: &DetailedGlyphRecord) -> Ordering {
self.entry_offset.cmp(&other.entry_offset)
}
}
// Manages the lookup table for detailed glyphs. Sorting is deferred
// until a lookup is actually performed; this matches the expected
// usage pattern of setting/appending all the detailed glyphs, and
// then querying without setting.
struct DetailedGlyphStore {
// TODO(pcwalton): Allocation of this buffer is expensive. Consider a small-vector
// optimization.
detail_buffer: Vec<DetailedGlyph>,
// TODO(pcwalton): Allocation of this buffer is expensive. Consider a small-vector
// optimization.
detail_lookup: Vec<DetailedGlyphRecord>,
lookup_is_sorted: bool,
}
impl<'a> DetailedGlyphStore {
fn new() -> DetailedGlyphStore {
DetailedGlyphStore {
detail_buffer: vec!(), // TODO: default size?
detail_lookup: vec!(),
lookup_is_sorted: false,
}
}
fn add_detailed_glyphs_for_entry(&mut self, entry_offset: CharIndex, glyphs: &[DetailedGlyph]) {
let entry = DetailedGlyphRecord {
entry_offset: entry_offset,
detail_offset: self.detail_buffer.len() as int,
};
debug!("Adding entry[off={}] for detailed glyphs: {:?}", entry_offset, glyphs);
/* TODO: don't actually assert this until asserts are compiled
in/out based on severity, debug/release, etc. This assertion
would wreck the complexity of the lookup.
See Rust Issue #3647, #2228, #3627 for related information.
do self.detail_lookup.borrow |arr| {
assert !arr.contains(entry)
}
*/
self.detail_lookup.push(entry);
self.detail_buffer.push_all(glyphs);
self.lookup_is_sorted = false;
}
fn get_detailed_glyphs_for_entry(&'a self, entry_offset: CharIndex, count: u16)
-> &'a [DetailedGlyph] {
debug!("Requesting detailed glyphs[n={}] for entry[off={}]", count, entry_offset);
// FIXME: Is this right? --pcwalton
// TODO: should fix this somewhere else
if count == 0 {
return self.detail_buffer.slice(0, 0);
}
assert!((count as uint) <= self.detail_buffer.len());
assert!(self.lookup_is_sorted);
let key = DetailedGlyphRecord {
entry_offset: entry_offset,
detail_offset: 0, // unused
};
let i = self.detail_lookup.as_slice().binary_search_index(&key)
.expect("Invalid index not found in detailed glyph lookup table!");
assert!(i + (count as uint) <= self.detail_buffer.len());
// return a slice into the buffer
self.detail_buffer.slice(i, i + count as uint)
}
fn get_detailed_glyph_with_index(&'a self,
entry_offset: CharIndex,
detail_offset: u16)
-> &'a DetailedGlyph {
assert!((detail_offset as uint) <= self.detail_buffer.len());
assert!(self.lookup_is_sorted);
let key = DetailedGlyphRecord {
entry_offset: entry_offset,
detail_offset: 0, // unused
};
let i = self.detail_lookup.as_slice().binary_search_index(&key)
.expect("Invalid index not found in detailed glyph lookup table!");
assert!(i + (detail_offset as uint) < self.detail_buffer.len());
&self.detail_buffer[i + (detail_offset as uint)]
}
fn ensure_sorted(&mut self) {
if self.lookup_is_sorted {
return;
}
// Sorting a unique vector is surprisingly hard. The follwing
// code is a good argument for using DVecs, but they require
// immutable locations thus don't play well with freezing.
// Thar be dragons here. You have been warned. (Tips accepted.)
let mut unsorted_records: Vec<DetailedGlyphRecord> = vec!();
mem::swap(&mut self.detail_lookup, &mut unsorted_records);
let mut mut_records : Vec<DetailedGlyphRecord> = unsorted_records;
mut_records.sort_by(|a, b| {
if a < b {
Less
} else {
Greater
}
});
let mut sorted_records = mut_records;
mem::swap(&mut self.detail_lookup, &mut sorted_records);
self.lookup_is_sorted = true;
}
}
// This struct is used by GlyphStore clients to provide new glyph data.
// It should be allocated on the stack and passed by reference to GlyphStore.
pub struct GlyphData {
id: GlyphId,
advance: Au,
offset: Point2D<Au>,
is_missing: bool,
cluster_start: bool,
ligature_start: bool,
}
impl GlyphData {
pub fn new(id: GlyphId,
advance: Au,
offset: Option<Point2D<Au>>,
is_missing: bool,
cluster_start: bool,
ligature_start: bool)
-> GlyphData {
GlyphData {
id: id,
advance: advance,
offset: offset.unwrap_or(Zero::zero()),
is_missing: is_missing,
cluster_start: cluster_start,
ligature_start: ligature_start,
}
}
}
// This enum is a proxy that's provided to GlyphStore clients when iterating
// through glyphs (either for a particular TextRun offset, or all glyphs).
// Rather than eagerly assembling and copying glyph data, it only retrieves
// values as they are needed from the GlyphStore, using provided offsets.
pub enum GlyphInfo<'a> {
SimpleGlyphInfo(&'a GlyphStore, CharIndex),
DetailGlyphInfo(&'a GlyphStore, CharIndex, u16),
}
impl<'a> GlyphInfo<'a> {
pub fn id(self) -> GlyphId {
match self {
SimpleGlyphInfo(store, entry_i) => store.entry_buffer[entry_i.to_uint()].id(),
DetailGlyphInfo(store, entry_i, detail_j) => {
store.detail_store.get_detailed_glyph_with_index(entry_i, detail_j).id
}
}
}
#[inline(always)]
// FIXME: Resolution conflicts with IteratorUtil trait so adding trailing _
pub fn advance(self) -> Au {
match self {
SimpleGlyphInfo(store, entry_i) => store.entry_buffer[entry_i.to_uint()].advance(),
DetailGlyphInfo(store, entry_i, detail_j) => {
store.detail_store.get_detailed_glyph_with_index(entry_i, detail_j).advance
}
}
}
pub fn offset(self) -> Option<Point2D<Au>> {
match self {
SimpleGlyphInfo(_, _) => None,
DetailGlyphInfo(store, entry_i, detail_j) => {
Some(store.detail_store.get_detailed_glyph_with_index(entry_i, detail_j).offset)
}
}
}
}
/// Stores the glyph data belonging to a text run.
///
/// Simple glyphs are stored inline in the `entry_buffer`, detailed glyphs are
/// stored as pointers into the `detail_store`.
///
/// ~~~
/// +- GlyphStore --------------------------------+
/// | +---+---+---+---+---+---+---+ |
/// | entry_buffer: | | s | | s | | s | s | | d = detailed
/// | +-|-+---+-|-+---+-|-+---+---+ | s = simple
/// | | | | |
/// | | +---+-------+ |
/// | | | |
/// | +-V-+-V-+ |
/// | detail_store: | d | d | |
/// | +---+---+ |
/// +---------------------------------------------+
/// ~~~
pub struct GlyphStore {
// TODO(pcwalton): Allocation of this buffer is expensive. Consider a small-vector
// optimization.
/// A buffer of glyphs within the text run, in the order in which they
/// appear in the input text
entry_buffer: Vec<GlyphEntry>,
/// A store of the detailed glyph data. Detailed glyphs contained in the
/// `entry_buffer` point to locations in this data structure.
detail_store: DetailedGlyphStore,
is_whitespace: bool,
}
int_range_index! {
#[deriving(Encodable)]
#[doc = "An index that refers to a character in a text run. This could \
point to the middle of a glyph."]
struct CharIndex(int)
}
impl<'a> GlyphStore {
// Initializes the glyph store, but doesn't actually shape anything.
// Use the set_glyph, set_glyphs() methods to store glyph data.
pub fn new(length: int, is_whitespace: bool) -> GlyphStore {
assert!(length > 0);
GlyphStore {
entry_buffer: Vec::from_elem(length as uint, GlyphEntry::initial()),
detail_store: DetailedGlyphStore::new(),
is_whitespace: is_whitespace,
}
}
pub fn char_len(&self) -> CharIndex {
CharIndex(self.entry_buffer.len() as int)
}
pub fn is_whitespace(&self) -> bool {
self.is_whitespace
}
pub fn finalize_changes(&mut self) {
self.detail_store.ensure_sorted();
}
pub fn add_glyph_for_char_index(&mut self, i: CharIndex, data: &GlyphData) {
fn glyph_is_compressible(data: &GlyphData) -> bool {
is_simple_glyph_id(data.id)
&& is_simple_advance(data.advance)
&& data.offset.is_zero()
&& data.cluster_start // others are stored in detail buffer
}
assert!(data.ligature_start); // can't compress ligature continuation glyphs.
assert!(i < self.char_len());
let entry = match (data.is_missing, glyph_is_compressible(data)) {
(true, _) => GlyphEntry::missing(1),
(false, true) => GlyphEntry::simple(data.id, data.advance),
(false, false) => {
let glyph = [DetailedGlyph::new(data.id, data.advance, data.offset)];
self.detail_store.add_detailed_glyphs_for_entry(i, glyph);
GlyphEntry::complex(data.cluster_start, data.ligature_start, 1)
}
}.adapt_character_flags_of_entry(self.entry_buffer[i.to_uint()]);
*self.entry_buffer.get_mut(i.to_uint()) = entry;
}
pub fn add_glyphs_for_char_index(&mut self, i: CharIndex, data_for_glyphs: &[GlyphData]) {
assert!(i < self.char_len());
assert!(data_for_glyphs.len() > 0);
let glyph_count = data_for_glyphs.len() as int;
let first_glyph_data = data_for_glyphs[0];
let entry = match first_glyph_data.is_missing {
true => GlyphEntry::missing(glyph_count),
false => {
let glyphs_vec = Vec::from_fn(glyph_count as uint, |i| {
DetailedGlyph::new(data_for_glyphs[i].id,
data_for_glyphs[i].advance,
data_for_glyphs[i].offset)
});
self.detail_store.add_detailed_glyphs_for_entry(i, glyphs_vec.as_slice());
GlyphEntry::complex(first_glyph_data.cluster_start,
first_glyph_data.ligature_start,
glyph_count)
}
}.adapt_character_flags_of_entry(self.entry_buffer[i.to_uint()]);
debug!("Adding multiple glyphs[idx={}, count={}]: {:?}", i, glyph_count, entry);
*self.entry_buffer.get_mut(i.to_uint()) = entry;
}
// used when a character index has no associated glyph---for example, a ligature continuation.
pub fn add_nonglyph_for_char_index(&mut self, i: CharIndex, cluster_start: bool, ligature_start: bool) {
assert!(i < self.char_len());
let entry = GlyphEntry::complex(cluster_start, ligature_start, 0);
debug!("adding spacer for chracter without associated glyph[idx={}]", i);
*self.entry_buffer.get_mut(i.to_uint()) = entry;
}
pub fn iter_glyphs_for_char_index(&'a self, i: CharIndex) -> GlyphIterator<'a> {
self.iter_glyphs_for_char_range(&Range::new(i, CharIndex(1)))
}
#[inline]
pub fn iter_glyphs_for_char_range(&'a self, rang: &Range<CharIndex>) -> GlyphIterator<'a> {
if rang.begin() >= self.char_len() {
fail!("iter_glyphs_for_range: range.begin beyond length!");
}
if rang.end() > self.char_len() {
fail!("iter_glyphs_for_range: range.end beyond length!");
}
GlyphIterator {
store: self,
char_index: rang.begin(),
char_range: rang.each_index(),
glyph_range: None,
}
}
#[inline]
pub fn advance_for_char_range(&self, rang: &Range<CharIndex>) -> Au {
self.iter_glyphs_for_char_range(rang)
.fold(Au(0), |advance, (_, glyph)| advance + glyph.advance())
}
// getter methods
pub fn char_is_space(&self, i: CharIndex) -> bool {
assert!(i < self.char_len());
self.entry_buffer[i.to_uint()].char_is_space()
}
pub fn char_is_tab(&self, i: CharIndex) -> bool {
assert!(i < self.char_len());
self.entry_buffer[i.to_uint()].char_is_tab()
}
pub fn char_is_newline(&self, i: CharIndex) -> bool {
assert!(i < self.char_len());
self.entry_buffer[i.to_uint()].char_is_newline()
}
pub fn is_ligature_start(&self, i: CharIndex) -> bool {
assert!(i < self.char_len());
self.entry_buffer[i.to_uint()].is_ligature_start()
}
pub fn is_cluster_start(&self, i: CharIndex) -> bool {
assert!(i < self.char_len());
self.entry_buffer[i.to_uint()].is_cluster_start()
}
pub fn can_break_before(&self, i: CharIndex) -> BreakType {
assert!(i < self.char_len());
self.entry_buffer[i.to_uint()].can_break_before()
}
// setter methods
pub fn set_char_is_space(&mut self, i: CharIndex) {
assert!(i < self.char_len());
let entry = self.entry_buffer[i.to_uint()];
*self.entry_buffer.get_mut(i.to_uint()) = entry.set_char_is_space();
}
pub fn set_char_is_tab(&mut self, i: CharIndex) {
assert!(i < self.char_len());
let entry = self.entry_buffer[i.to_uint()];
*self.entry_buffer.get_mut(i.to_uint()) = entry.set_char_is_tab();
}
pub fn set_char_is_newline(&mut self, i: CharIndex) {
assert!(i < self.char_len());
let entry = self.entry_buffer[i.to_uint()];
*self.entry_buffer.get_mut(i.to_uint()) = entry.set_char_is_newline();
}
pub fn set_can_break_before(&mut self, i: CharIndex, t: BreakType) {
assert!(i < self.char_len());
let entry = self.entry_buffer[i.to_uint()];
*self.entry_buffer.get_mut(i.to_uint()) = entry.set_can_break_before(t);
}
}
/// An iterator over the glyphs in a character range in a `GlyphStore`.
pub struct GlyphIterator<'a> {
store: &'a GlyphStore,
char_index: CharIndex,
char_range: EachIndex<int, CharIndex>,
glyph_range: Option<EachIndex<int, CharIndex>>,
}
impl<'a> GlyphIterator<'a> {
// Slow path when there is a glyph range.
#[inline(never)]
fn next_glyph_range(&mut self) -> Option<(CharIndex, GlyphInfo<'a>)> {
match self.glyph_range.get_mut_ref().next() {
Some(j) => Some((self.char_index,
DetailGlyphInfo(self.store, self.char_index, j.get() as u16 /* ??? */))),
None => {
// No more glyphs for current character. Try to get another.
self.glyph_range = None;
self.next()
}
}
}
// Slow path when there is a complex glyph.
#[inline(never)]
fn next_complex_glyph(&mut self, entry: &GlyphEntry, i: CharIndex)
-> Option<(CharIndex, GlyphInfo<'a>)> {
let glyphs = self.store.detail_store.get_detailed_glyphs_for_entry(i, entry.glyph_count());
self.glyph_range = Some(range::each_index(CharIndex(0), CharIndex(glyphs.len() as int)));
self.next()
}
}
impl<'a> Iterator<(CharIndex, GlyphInfo<'a>)> for GlyphIterator<'a> {
// I tried to start with something simpler and apply FlatMap, but the
// inability to store free variables in the FlatMap struct was problematic.
//
// This function consists of the fast path and is designed to be inlined into its caller. The
// slow paths, which should not be inlined, are `next_glyph_range()` and
// `next_complex_glyph()`.
#[inline(always)]
fn next(&mut self) -> Option<(CharIndex, GlyphInfo<'a>)> {
// Would use 'match' here but it borrows contents in a way that
// interferes with mutation.
if self.glyph_range.is_some() {
self.next_glyph_range()
} else {
// No glyph range. Look at next character.
self.char_range.next().and_then(|i| {
self.char_index = i;
assert!(i < self.store.char_len());
let entry = self.store.entry_buffer[i.to_uint()];
if entry.is_simple() {
Some((self.char_index, SimpleGlyphInfo(self.store, i)))
} else {
// Fall back to the slow path.
self.next_complex_glyph(&entry, i)
}
})
}
}
}

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@ -0,0 +1,18 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* This file exists just to make it easier to import things inside of
./text/ without specifying the file they came out of imports.
Note that you still must define each of the files as a module in
servo.rc. This is not ideal and may be changed in the future. */
pub use text::shaping::Shaper;
pub use text::text_run::TextRun;
pub mod glyph;
#[path="shaping/mod.rs"] pub mod shaping;
pub mod text_run;
pub mod util;

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@ -0,0 +1,541 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
extern crate harfbuzz;
use font::{Font, FontHandleMethods, FontTableMethods, FontTableTag};
use platform::font::FontTable;
use text::glyph::{CharIndex, GlyphStore, GlyphId, GlyphData};
use text::shaping::ShaperMethods;
use text::util::{float_to_fixed, fixed_to_float};
use geom::Point2D;
use harfbuzz::{HB_MEMORY_MODE_READONLY, HB_DIRECTION_LTR};
use harfbuzz::{hb_blob_create, hb_face_create_for_tables};
use harfbuzz::{hb_blob_t};
use harfbuzz::{hb_bool_t};
use harfbuzz::{hb_buffer_add_utf8};
use harfbuzz::{hb_buffer_destroy};
use harfbuzz::{hb_buffer_get_glyph_positions};
use harfbuzz::{hb_buffer_set_direction};
use harfbuzz::{hb_face_destroy};
use harfbuzz::{hb_face_t, hb_font_t};
use harfbuzz::{hb_font_create};
use harfbuzz::{hb_font_destroy, hb_buffer_create};
use harfbuzz::{hb_font_funcs_create};
use harfbuzz::{hb_font_funcs_destroy};
use harfbuzz::{hb_font_funcs_set_glyph_func};
use harfbuzz::{hb_font_funcs_set_glyph_h_advance_func};
use harfbuzz::{hb_font_funcs_set_glyph_h_kerning_func};
use harfbuzz::{hb_font_funcs_t, hb_buffer_t, hb_codepoint_t};
use harfbuzz::{hb_font_set_funcs};
use harfbuzz::{hb_font_set_ppem};
use harfbuzz::{hb_font_set_scale};
use harfbuzz::{hb_glyph_info_t};
use harfbuzz::{hb_glyph_position_t};
use harfbuzz::{hb_position_t, hb_tag_t};
use harfbuzz::{hb_shape, hb_buffer_get_glyph_infos};
use libc::{c_uint, c_int, c_void, c_char};
use servo_util::geometry::Au;
use servo_util::range::Range;
use std::mem;
use std::char;
use std::cmp;
use std::ptr;
static NO_GLYPH: i32 = -1;
static CONTINUATION_BYTE: i32 = -2;
pub struct ShapedGlyphData {
count: int,
glyph_infos: *mut hb_glyph_info_t,
pos_infos: *mut hb_glyph_position_t,
}
pub struct ShapedGlyphEntry {
codepoint: GlyphId,
advance: Au,
offset: Option<Point2D<Au>>,
}
impl ShapedGlyphData {
pub fn new(buffer: *mut hb_buffer_t) -> ShapedGlyphData {
unsafe {
let mut glyph_count = 0;
let glyph_infos = hb_buffer_get_glyph_infos(buffer, &mut glyph_count);
let glyph_count = glyph_count as int;
assert!(glyph_infos.is_not_null());
let mut pos_count = 0;
let pos_infos = hb_buffer_get_glyph_positions(buffer, &mut pos_count);
let pos_count = pos_count as int;
assert!(pos_infos.is_not_null());
assert!(glyph_count == pos_count);
ShapedGlyphData {
count: glyph_count,
glyph_infos: glyph_infos,
pos_infos: pos_infos,
}
}
}
#[inline(always)]
fn byte_offset_of_glyph(&self, i: int) -> int {
assert!(i < self.count);
unsafe {
let glyph_info_i = self.glyph_infos.offset(i);
(*glyph_info_i).cluster as int
}
}
pub fn len(&self) -> int {
self.count
}
/// Returns shaped glyph data for one glyph, and updates the y-position of the pen.
pub fn get_entry_for_glyph(&self, i: int, y_pos: &mut Au) -> ShapedGlyphEntry {
assert!(i < self.count);
unsafe {
let glyph_info_i = self.glyph_infos.offset(i);
let pos_info_i = self.pos_infos.offset(i);
let x_offset = Shaper::fixed_to_float((*pos_info_i).x_offset);
let y_offset = Shaper::fixed_to_float((*pos_info_i).y_offset);
let x_advance = Shaper::fixed_to_float((*pos_info_i).x_advance);
let y_advance = Shaper::fixed_to_float((*pos_info_i).y_advance);
let x_offset = Au::from_frac_px(x_offset);
let y_offset = Au::from_frac_px(y_offset);
let x_advance = Au::from_frac_px(x_advance);
let y_advance = Au::from_frac_px(y_advance);
let offset = if x_offset == Au(0) && y_offset == Au(0) && y_advance == Au(0) {
None
} else {
// adjust the pen..
if y_advance > Au(0) {
*y_pos = *y_pos - y_advance;
}
Some(Point2D(x_offset, *y_pos - y_offset))
};
ShapedGlyphEntry {
codepoint: (*glyph_info_i).codepoint as GlyphId,
advance: x_advance,
offset: offset,
}
}
}
}
pub struct Shaper {
hb_face: *mut hb_face_t,
hb_font: *mut hb_font_t,
hb_funcs: *mut hb_font_funcs_t,
}
#[unsafe_destructor]
impl Drop for Shaper {
fn drop(&mut self) {
unsafe {
assert!(self.hb_face.is_not_null());
hb_face_destroy(self.hb_face);
assert!(self.hb_font.is_not_null());
hb_font_destroy(self.hb_font);
assert!(self.hb_funcs.is_not_null());
hb_font_funcs_destroy(self.hb_funcs);
}
}
}
impl Shaper {
pub fn new(font: &mut Font) -> Shaper {
unsafe {
// Indirection for Rust Issue #6248, dynamic freeze scope artifically extended
let font_ptr = font as *mut Font;
let hb_face: *mut hb_face_t = hb_face_create_for_tables(get_font_table_func,
font_ptr as *mut c_void,
None);
let hb_font: *mut hb_font_t = hb_font_create(hb_face);
// Set points-per-em. if zero, performs no hinting in that direction.
let pt_size = font.pt_size;
hb_font_set_ppem(hb_font, pt_size as c_uint, pt_size as c_uint);
// Set scaling. Note that this takes 16.16 fixed point.
hb_font_set_scale(hb_font,
Shaper::float_to_fixed(pt_size) as c_int,
Shaper::float_to_fixed(pt_size) as c_int);
// configure static function callbacks.
// NB. This funcs structure could be reused globally, as it never changes.
let hb_funcs: *mut hb_font_funcs_t = hb_font_funcs_create();
hb_font_funcs_set_glyph_func(hb_funcs, glyph_func, ptr::mut_null(), None);
hb_font_funcs_set_glyph_h_advance_func(hb_funcs, glyph_h_advance_func, ptr::mut_null(), None);
hb_font_funcs_set_glyph_h_kerning_func(hb_funcs, glyph_h_kerning_func, ptr::mut_null(), ptr::mut_null());
hb_font_set_funcs(hb_font, hb_funcs, font_ptr as *mut c_void, None);
Shaper {
hb_face: hb_face,
hb_font: hb_font,
hb_funcs: hb_funcs,
}
}
}
fn float_to_fixed(f: f64) -> i32 {
float_to_fixed(16, f)
}
fn fixed_to_float(i: hb_position_t) -> f64 {
fixed_to_float(16, i)
}
}
impl ShaperMethods for Shaper {
/// Calculate the layout metrics associated with the given text when rendered in a specific
/// font.
fn shape_text(&self, text: &str, glyphs: &mut GlyphStore) {
unsafe {
let hb_buffer: *mut hb_buffer_t = hb_buffer_create();
hb_buffer_set_direction(hb_buffer, HB_DIRECTION_LTR);
hb_buffer_add_utf8(hb_buffer,
text.as_ptr() as *const c_char,
text.len() as c_int,
0,
text.len() as c_int);
hb_shape(self.hb_font, hb_buffer, ptr::mut_null(), 0);
self.save_glyph_results(text, glyphs, hb_buffer);
hb_buffer_destroy(hb_buffer);
}
}
}
impl Shaper {
fn save_glyph_results(&self, text: &str, glyphs: &mut GlyphStore, buffer: *mut hb_buffer_t) {
let glyph_data = ShapedGlyphData::new(buffer);
let glyph_count = glyph_data.len();
let byte_max = text.len() as int;
let char_max = text.char_len() as int;
// GlyphStore records are indexed by character, not byte offset.
// so, we must be careful to increment this when saving glyph entries.
let mut char_idx = CharIndex(0);
assert!(glyph_count <= char_max);
debug!("Shaped text[char count={}], got back {} glyph info records.",
char_max,
glyph_count);
if char_max != glyph_count {
debug!("NOTE: Since these are not equal, we probably have been given some complex \
glyphs.");
}
// make map of what chars have glyphs
let mut byteToGlyph: Vec<i32>;
// fast path: all chars are single-byte.
if byte_max == char_max {
byteToGlyph = Vec::from_elem(byte_max as uint, NO_GLYPH);
} else {
byteToGlyph = Vec::from_elem(byte_max as uint, CONTINUATION_BYTE);
for (i, _) in text.char_indices() {
*byteToGlyph.get_mut(i) = NO_GLYPH;
}
}
debug!("(glyph idx) -> (text byte offset)");
for i in range(0, glyph_data.len()) {
// loc refers to a *byte* offset within the utf8 string.
let loc = glyph_data.byte_offset_of_glyph(i);
if loc < byte_max {
assert!(*byteToGlyph.get(loc as uint) != CONTINUATION_BYTE);
*byteToGlyph.get_mut(loc as uint) = i as i32;
} else {
debug!("ERROR: tried to set out of range byteToGlyph: idx={}, glyph idx={}",
loc,
i);
}
debug!("{} -> {}", i, loc);
}
debug!("text: {:s}", text);
debug!("(char idx): char->(glyph index):");
for (i, ch) in text.char_indices() {
debug!("{}: {} --> {:d}", i, ch, *byteToGlyph.get(i) as int);
}
// some helpers
let mut glyph_span: Range<int> = Range::empty();
// this span contains first byte of first char, to last byte of last char in range.
// so, end() points to first byte of last+1 char, if it's less than byte_max.
let mut char_byte_span: Range<int> = Range::empty();
let mut y_pos = Au(0);
// main loop over each glyph. each iteration usually processes 1 glyph and 1+ chars.
// in cases with complex glyph-character assocations, 2+ glyphs and 1+ chars can be
// processed.
while glyph_span.begin() < glyph_count {
// start by looking at just one glyph.
glyph_span.extend_by(1);
debug!("Processing glyph at idx={}", glyph_span.begin());
let char_byte_start = glyph_data.byte_offset_of_glyph(glyph_span.begin());
char_byte_span.reset(char_byte_start, 0);
// find a range of chars corresponding to this glyph, plus
// any trailing chars that do not have associated glyphs.
while char_byte_span.end() < byte_max {
let range = text.char_range_at(char_byte_span.end() as uint);
drop(range.ch);
char_byte_span.extend_to(range.next as int);
debug!("Processing char byte span: off={}, len={} for glyph idx={}",
char_byte_span.begin(), char_byte_span.length(), glyph_span.begin());
while char_byte_span.end() != byte_max &&
byteToGlyph[char_byte_span.end() as uint] == NO_GLYPH {
debug!("Extending char byte span to include byte offset={} with no associated \
glyph", char_byte_span.end());
let range = text.char_range_at(char_byte_span.end() as uint);
drop(range.ch);
char_byte_span.extend_to(range.next as int);
}
// extend glyph range to max glyph index covered by char_span,
// in cases where one char made several glyphs and left some unassociated chars.
let mut max_glyph_idx = glyph_span.end();
for i in char_byte_span.each_index() {
if byteToGlyph[i as uint] > NO_GLYPH {
max_glyph_idx = cmp::max(byteToGlyph[i as uint] as int + 1, max_glyph_idx);
}
}
if max_glyph_idx > glyph_span.end() {
glyph_span.extend_to(max_glyph_idx);
debug!("Extended glyph span (off={}, len={}) to cover char byte span's max \
glyph index",
glyph_span.begin(), glyph_span.length());
}
// if there's just one glyph, then we don't need further checks.
if glyph_span.length() == 1 { break; }
// if no glyphs were found yet, extend the char byte range more.
if glyph_span.length() == 0 { continue; }
debug!("Complex (multi-glyph to multi-char) association found. This case \
probably doesn't work.");
let mut all_glyphs_are_within_cluster: bool = true;
for j in glyph_span.each_index() {
let loc = glyph_data.byte_offset_of_glyph(j);
if !char_byte_span.contains(loc) {
all_glyphs_are_within_cluster = false;
break
}
}
debug!("All glyphs within char_byte_span cluster?: {}",
all_glyphs_are_within_cluster);
// found a valid range; stop extending char_span.
if all_glyphs_are_within_cluster {
break
}
}
// character/glyph clump must contain characters.
assert!(char_byte_span.length() > 0);
// character/glyph clump must contain glyphs.
assert!(glyph_span.length() > 0);
// now char_span is a ligature clump, formed by the glyphs in glyph_span.
// we need to find the chars that correspond to actual glyphs (char_extended_span),
//and set glyph info for those and empty infos for the chars that are continuations.
// a simple example:
// chars: 'f' 't' 't'
// glyphs: 'ftt' '' ''
// cgmap: t f f
// gspan: [-]
// cspan: [-]
// covsp: [---------------]
let mut covered_byte_span = char_byte_span.clone();
// extend, clipping at end of text range.
while covered_byte_span.end() < byte_max
&& byteToGlyph[covered_byte_span.end() as uint] == NO_GLYPH {
let range = text.char_range_at(covered_byte_span.end() as uint);
drop(range.ch);
covered_byte_span.extend_to(range.next as int);
}
if covered_byte_span.begin() >= byte_max {
// oops, out of range. clip and forget this clump.
let end = glyph_span.end(); // FIXME: borrow checker workaround
glyph_span.reset(end, 0);
let end = char_byte_span.end(); // FIXME: borrow checker workaround
char_byte_span.reset(end, 0);
}
// clamp to end of text. (I don't think this will be necessary, but..)
let end = covered_byte_span.end(); // FIXME: borrow checker workaround
covered_byte_span.extend_to(cmp::min(end, byte_max));
// fast path: 1-to-1 mapping of single char and single glyph.
if glyph_span.length() == 1 {
// TODO(Issue #214): cluster ranges need to be computed before
// shaping, and then consulted here.
// for now, just pretend that every character is a cluster start.
// (i.e., pretend there are no combining character sequences).
// 1-to-1 mapping of character to glyph also treated as ligature start.
let shape = glyph_data.get_entry_for_glyph(glyph_span.begin(), &mut y_pos);
let data = GlyphData::new(shape.codepoint,
shape.advance,
shape.offset,
false,
true,
true);
glyphs.add_glyph_for_char_index(char_idx, &data);
} else {
// collect all glyphs to be assigned to the first character.
let mut datas = vec!();
for glyph_i in glyph_span.each_index() {
let shape = glyph_data.get_entry_for_glyph(glyph_i, &mut y_pos);
datas.push(GlyphData::new(shape.codepoint,
shape.advance,
shape.offset,
false, // not missing
true, // treat as cluster start
glyph_i > glyph_span.begin()));
// all but first are ligature continuations
}
// now add the detailed glyph entry.
glyphs.add_glyphs_for_char_index(char_idx, datas.as_slice());
// set the other chars, who have no glyphs
let mut i = covered_byte_span.begin();
loop {
let range = text.char_range_at(i as uint);
drop(range.ch);
i = range.next as int;
if i >= covered_byte_span.end() { break; }
char_idx = char_idx + CharIndex(1);
glyphs.add_nonglyph_for_char_index(char_idx, false, false);
}
}
// shift up our working spans past things we just handled.
let end = glyph_span.end(); // FIXME: borrow checker workaround
glyph_span.reset(end, 0);
let end = char_byte_span.end();; // FIXME: borrow checker workaround
char_byte_span.reset(end, 0);
char_idx = char_idx + CharIndex(1);
}
// this must be called after adding all glyph data; it sorts the
// lookup table for finding detailed glyphs by associated char index.
glyphs.finalize_changes();
}
}
/// Callbacks from Harfbuzz when font map and glyph advance lookup needed.
extern fn glyph_func(_: *mut hb_font_t,
font_data: *mut c_void,
unicode: hb_codepoint_t,
_: hb_codepoint_t,
glyph: *mut hb_codepoint_t,
_: *mut c_void)
-> hb_bool_t {
let font: *const Font = font_data as *const Font;
assert!(font.is_not_null());
unsafe {
match (*font).glyph_index(char::from_u32(unicode).unwrap()) {
Some(g) => {
*glyph = g as hb_codepoint_t;
true as hb_bool_t
}
None => false as hb_bool_t
}
}
}
extern fn glyph_h_advance_func(_: *mut hb_font_t,
font_data: *mut c_void,
glyph: hb_codepoint_t,
_: *mut c_void)
-> hb_position_t {
let font: *mut Font = font_data as *mut Font;
assert!(font.is_not_null());
unsafe {
let advance = (*font).glyph_h_advance(glyph as GlyphId);
Shaper::float_to_fixed(advance)
}
}
extern fn glyph_h_kerning_func(_: *mut hb_font_t,
font_data: *mut c_void,
first_glyph: hb_codepoint_t,
second_glyph: hb_codepoint_t,
_: *mut c_void)
-> hb_position_t {
let font: *mut Font = font_data as *mut Font;
assert!(font.is_not_null());
unsafe {
let advance = (*font).glyph_h_kerning(first_glyph as GlyphId, second_glyph as GlyphId);
Shaper::float_to_fixed(advance)
}
}
// Callback to get a font table out of a font.
extern fn get_font_table_func(_: *mut hb_face_t, tag: hb_tag_t, user_data: *mut c_void) -> *mut hb_blob_t {
unsafe {
let font: *const Font = user_data as *const Font;
assert!(font.is_not_null());
// TODO(Issue #197): reuse font table data, which will change the unsound trickery here.
match (*font).get_table_for_tag(tag as FontTableTag) {
None => ptr::mut_null(),
Some(ref font_table) => {
let skinny_font_table_ptr: *const FontTable = font_table; // private context
let mut blob: *mut hb_blob_t = ptr::mut_null();
(*skinny_font_table_ptr).with_buffer(|buf: *const u8, len: uint| {
// HarfBuzz calls `destroy_blob_func` when the buffer is no longer needed.
blob = hb_blob_create(buf as *const c_char,
len as c_uint,
HB_MEMORY_MODE_READONLY,
mem::transmute(skinny_font_table_ptr),
destroy_blob_func);
});
assert!(blob.is_not_null());
blob
}
}
}
}
// TODO(Issue #197): reuse font table data, which will change the unsound trickery here.
// In particular, we'll need to cast to a boxed, rather than owned, FontTable.
// even better, should cache the harfbuzz blobs directly instead of recreating a lot.
extern fn destroy_blob_func(_: *mut c_void) {
// TODO: Previous code here was broken. Rewrite.
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Shaper encapsulates a specific shaper, such as Harfbuzz,
//! Uniscribe, Pango, or Coretext.
//!
//! Currently, only harfbuzz bindings are implemented.
use text::glyph::GlyphStore;
pub use Shaper = text::shaping::harfbuzz::Shaper;
pub mod harfbuzz;
pub trait ShaperMethods {
fn shape_text(&self, text: &str, glyphs: &mut GlyphStore);
}

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use font::{Font, RunMetrics, FontMetrics};
use servo_util::geometry::Au;
use servo_util::range::Range;
use servo_util::vec::{Comparator, FullBinarySearchMethods};
use std::slice::Items;
use sync::Arc;
use text::glyph::{CharIndex, GlyphStore};
use font::FontHandleMethods;
use platform::font_template::FontTemplateData;
/// A single "paragraph" of text in one font size and style.
#[deriving(Clone)]
pub struct TextRun {
pub text: Arc<String>,
pub font_template: Arc<FontTemplateData>,
pub pt_size: f64,
pub font_metrics: FontMetrics,
/// The glyph runs that make up this text run.
pub glyphs: Arc<Vec<GlyphRun>>,
}
/// A single series of glyphs within a text run.
#[deriving(Clone)]
pub struct GlyphRun {
/// The glyphs.
glyph_store: Arc<GlyphStore>,
/// The range of characters in the containing run.
range: Range<CharIndex>,
}
pub struct SliceIterator<'a> {
glyph_iter: Items<'a, GlyphRun>,
range: Range<CharIndex>,
}
struct CharIndexComparator;
impl Comparator<CharIndex,GlyphRun> for CharIndexComparator {
fn compare(&self, key: &CharIndex, value: &GlyphRun) -> Ordering {
if *key < value.range.begin() {
Less
} else if *key >= value.range.end() {
Greater
} else {
Equal
}
}
}
impl<'a> Iterator<(&'a GlyphStore, CharIndex, Range<CharIndex>)> for SliceIterator<'a> {
// inline(always) due to the inefficient rt failures messing up inline heuristics, I think.
#[inline(always)]
fn next(&mut self) -> Option<(&'a GlyphStore, CharIndex, Range<CharIndex>)> {
let slice_glyphs = self.glyph_iter.next();
if slice_glyphs.is_none() {
return None;
}
let slice_glyphs = slice_glyphs.unwrap();
let mut char_range = self.range.intersect(&slice_glyphs.range);
let slice_range_begin = slice_glyphs.range.begin();
char_range.shift_by(-slice_range_begin);
if !char_range.is_empty() {
return Some((&*slice_glyphs.glyph_store, slice_range_begin, char_range))
}
return None;
}
}
pub struct LineIterator<'a> {
range: Range<CharIndex>,
clump: Option<Range<CharIndex>>,
slices: SliceIterator<'a>,
}
impl<'a> Iterator<Range<CharIndex>> for LineIterator<'a> {
fn next(&mut self) -> Option<Range<CharIndex>> {
// Loop until we hit whitespace and are in a clump.
loop {
match self.slices.next() {
Some((glyphs, offset, slice_range)) => {
match (glyphs.is_whitespace(), self.clump) {
(false, Some(ref mut c)) => {
c.extend_by(slice_range.length());
}
(false, None) => {
let mut c = slice_range;
c.shift_by(offset);
self.clump = Some(c);
}
(true, None) => { /* chomp whitespace */ }
(true, Some(c)) => {
self.clump = None;
// The final whitespace clump is not included.
return Some(c);
}
}
},
None => {
// flush any remaining chars as a line
if self.clump.is_some() {
let mut c = self.clump.take_unwrap();
c.extend_to(self.range.end());
return Some(c);
} else {
return None;
}
}
}
}
}
}
impl<'a> TextRun {
pub fn new(font: &mut Font, text: String) -> TextRun {
let glyphs = TextRun::break_and_shape(font, text.as_slice());
let run = TextRun {
text: Arc::new(text),
font_metrics: font.metrics.clone(),
font_template: font.handle.get_template(),
pt_size: font.pt_size,
glyphs: Arc::new(glyphs),
};
return run;
}
pub fn break_and_shape(font: &mut Font, text: &str) -> Vec<GlyphRun> {
// TODO(Issue #230): do a better job. See Gecko's LineBreaker.
let mut glyphs = vec!();
let (mut byte_i, mut char_i) = (0u, CharIndex(0));
let mut cur_slice_is_whitespace = false;
let (mut byte_last_boundary, mut char_last_boundary) = (0, CharIndex(0));
while byte_i < text.len() {
let range = text.char_range_at(byte_i);
let ch = range.ch;
let next = range.next;
// Slices alternate between whitespace and non-whitespace,
// representing line break opportunities.
let can_break_before = if cur_slice_is_whitespace {
match ch {
' ' | '\t' | '\n' => false,
_ => {
cur_slice_is_whitespace = false;
true
}
}
} else {
match ch {
' ' | '\t' | '\n' => {
cur_slice_is_whitespace = true;
true
},
_ => false
}
};
// Create a glyph store for this slice if it's nonempty.
if can_break_before && byte_i > byte_last_boundary {
let slice = text.slice(byte_last_boundary, byte_i).to_string();
debug!("creating glyph store for slice {} (ws? {}), {} - {} in run {}",
slice, !cur_slice_is_whitespace, byte_last_boundary, byte_i, text);
glyphs.push(GlyphRun {
glyph_store: font.shape_text(slice, !cur_slice_is_whitespace),
range: Range::new(char_last_boundary, char_i - char_last_boundary),
});
byte_last_boundary = byte_i;
char_last_boundary = char_i;
}
byte_i = next;
char_i = char_i + CharIndex(1);
}
// Create a glyph store for the final slice if it's nonempty.
if byte_i > byte_last_boundary {
let slice = text.slice_from(byte_last_boundary).to_string();
debug!("creating glyph store for final slice {} (ws? {}), {} - {} in run {}",
slice, cur_slice_is_whitespace, byte_last_boundary, text.len(), text);
glyphs.push(GlyphRun {
glyph_store: font.shape_text(slice, cur_slice_is_whitespace),
range: Range::new(char_last_boundary, char_i - char_last_boundary),
});
}
glyphs
}
pub fn char_len(&self) -> CharIndex {
match self.glyphs.last() {
None => CharIndex(0),
Some(ref glyph_run) => glyph_run.range.end(),
}
}
pub fn glyphs(&'a self) -> &'a Vec<GlyphRun> {
&*self.glyphs
}
pub fn range_is_trimmable_whitespace(&self, range: &Range<CharIndex>) -> bool {
self.iter_slices_for_range(range).all(|(slice_glyphs, _, _)| {
slice_glyphs.is_whitespace()
})
}
pub fn ascent(&self) -> Au {
self.font_metrics.ascent
}
pub fn descent(&self) -> Au {
self.font_metrics.descent
}
pub fn advance_for_range(&self, range: &Range<CharIndex>) -> Au {
// TODO(Issue #199): alter advance direction for RTL
// TODO(Issue #98): using inter-char and inter-word spacing settings when measuring text
self.iter_slices_for_range(range)
.fold(Au(0), |advance, (glyphs, _, slice_range)| {
advance + glyphs.advance_for_char_range(&slice_range)
})
}
pub fn metrics_for_range(&self, range: &Range<CharIndex>) -> RunMetrics {
RunMetrics::new(self.advance_for_range(range),
self.font_metrics.ascent,
self.font_metrics.descent)
}
pub fn metrics_for_slice(&self, glyphs: &GlyphStore, slice_range: &Range<CharIndex>) -> RunMetrics {
RunMetrics::new(glyphs.advance_for_char_range(slice_range),
self.font_metrics.ascent,
self.font_metrics.descent)
}
pub fn min_width_for_range(&self, range: &Range<CharIndex>) -> Au {
debug!("iterating outer range {:?}", range);
self.iter_slices_for_range(range).fold(Au(0), |max_piece_width, (_, offset, slice_range)| {
debug!("iterated on {:?}[{:?}]", offset, slice_range);
Au::max(max_piece_width, self.advance_for_range(&slice_range))
})
}
/// Returns the index of the first glyph run containing the given character index.
fn index_of_first_glyph_run_containing(&self, index: CharIndex) -> Option<uint> {
self.glyphs.as_slice().binary_search_index_by(&index, CharIndexComparator)
}
pub fn iter_slices_for_range(&'a self, range: &Range<CharIndex>) -> SliceIterator<'a> {
let index = match self.index_of_first_glyph_run_containing(range.begin()) {
None => self.glyphs.len(),
Some(index) => index,
};
SliceIterator {
glyph_iter: self.glyphs.slice_from(index).iter(),
range: *range,
}
}
pub fn iter_natural_lines_for_range(&'a self, range: &Range<CharIndex>) -> LineIterator<'a> {
LineIterator {
range: *range,
clump: None,
slices: self.iter_slices_for_range(range),
}
}
}

285
components/gfx/text/util.rs Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use text::glyph::CharIndex;
#[deriving(PartialEq)]
pub enum CompressionMode {
CompressNone,
CompressWhitespace,
CompressWhitespaceNewline,
DiscardNewline
}
// ported from Gecko's nsTextFrameUtils::TransformText.
//
// High level TODOs:
//
// * Issue #113: consider incoming text state (arabic, etc)
// and propogate outgoing text state (dual of above)
//
// * Issue #114: record skipped and kept chars for mapping original to new text
//
// * Untracked: various edge cases for bidi, CJK, etc.
pub fn transform_text(text: &str, mode: CompressionMode,
incoming_whitespace: bool,
new_line_pos: &mut Vec<CharIndex>) -> (String, bool) {
let mut out_str = String::new();
let out_whitespace = match mode {
CompressNone | DiscardNewline => {
let mut new_line_index = CharIndex(0);
for ch in text.chars() {
if is_discardable_char(ch, mode) {
// TODO: record skipped char
} else {
// TODO: record kept char
if ch == '\t' {
// TODO: set "has tab" flag
} else if ch == '\n' {
// Save new-line's position for line-break
// This value is relative(not absolute)
new_line_pos.push(new_line_index);
new_line_index = CharIndex(0);
}
if ch != '\n' {
new_line_index = new_line_index + CharIndex(1);
}
out_str.push_char(ch);
}
}
text.len() > 0 && is_in_whitespace(text.char_at_reverse(0), mode)
},
CompressWhitespace | CompressWhitespaceNewline => {
let mut in_whitespace: bool = incoming_whitespace;
for ch in text.chars() {
// TODO: discard newlines between CJK chars
let mut next_in_whitespace: bool = is_in_whitespace(ch, mode);
if !next_in_whitespace {
if is_always_discardable_char(ch) {
// revert whitespace setting, since this char was discarded
next_in_whitespace = in_whitespace;
// TODO: record skipped char
} else {
// TODO: record kept char
out_str.push_char(ch);
}
} else { /* next_in_whitespace; possibly add a space char */
if in_whitespace {
// TODO: record skipped char
} else {
// TODO: record kept char
out_str.push_char(' ');
}
}
// save whitespace context for next char
in_whitespace = next_in_whitespace;
} /* /for str::each_char */
in_whitespace
}
};
return (out_str.into_string(), out_whitespace);
fn is_in_whitespace(ch: char, mode: CompressionMode) -> bool {
match (ch, mode) {
(' ', _) => true,
('\t', _) => true,
('\n', CompressWhitespaceNewline) => true,
(_, _) => false
}
}
fn is_discardable_char(ch: char, mode: CompressionMode) -> bool {
if is_always_discardable_char(ch) {
return true;
}
match mode {
DiscardNewline | CompressWhitespaceNewline => ch == '\n',
_ => false
}
}
fn is_always_discardable_char(_ch: char) -> bool {
// TODO: check for bidi control chars, soft hyphens.
false
}
}
pub fn float_to_fixed(before: int, f: f64) -> i32 {
(1i32 << before as uint) * (f as i32)
}
pub fn fixed_to_float(before: int, f: i32) -> f64 {
f as f64 * 1.0f64 / ((1i32 << before as uint) as f64)
}
pub fn fixed_to_rounded_int(before: int, f: i32) -> int {
let half = 1i32 << (before-1) as uint;
if f > 0i32 {
((half + f) >> before as uint) as int
} else {
-((half - f) >> before as uint) as int
}
}
/* Generate a 32-bit TrueType tag from its 4 characters */
pub fn true_type_tag(a: char, b: char, c: char, d: char) -> u32 {
let a = a as u32;
let b = b as u32;
let c = c as u32;
let d = d as u32;
(a << 24 | b << 16 | c << 8 | d) as u32
}
#[test]
fn test_true_type_tag() {
assert_eq!(true_type_tag('c', 'm', 'a', 'p'), 0x_63_6D_61_70_u32);
}
#[test]
fn test_transform_compress_none() {
let test_strs = vec!(
" foo bar",
"foo bar ",
"foo\n bar",
"foo \nbar",
" foo bar \nbaz",
"foo bar baz",
"foobarbaz\n\n"
);
let mode = CompressNone;
for test in test_strs.iter() {
let mut new_line_pos = vec!();
let (trimmed_str, _out) = transform_text(*test, mode, true, &mut new_line_pos);
assert_eq!(trimmed_str.as_slice(), *test)
}
}
#[test]
fn test_transform_discard_newline() {
let test_strs = vec!(
" foo bar",
"foo bar ",
"foo\n bar",
"foo \nbar",
" foo bar \nbaz",
"foo bar baz",
"foobarbaz\n\n"
);
let oracle_strs = vec!(
" foo bar",
"foo bar ",
"foo bar",
"foo bar",
" foo bar baz",
"foo bar baz",
"foobarbaz"
);
assert_eq!(test_strs.len(), oracle_strs.len());
let mode = DiscardNewline;
for (test, oracle) in test_strs.iter().zip(oracle_strs.iter()) {
let mut new_line_pos = vec!();
let (trimmed_str, _out) = transform_text(*test, mode, true, &mut new_line_pos);
assert_eq!(trimmed_str.as_slice(), *oracle)
}
}
/* FIXME: Fix and re-enable
#[test]
fn test_transform_compress_whitespace() {
let test_strs : ~[String] = ~[" foo bar".to_string(),
"foo bar ".to_string(),
"foo\n bar".to_string(),
"foo \nbar".to_string(),
" foo bar \nbaz".to_string(),
"foo bar baz".to_string(),
"foobarbaz\n\n".to_string()];
let oracle_strs : ~[String] = ~[" foo bar".to_string(),
"foo bar ".to_string(),
"foo\n bar".to_string(),
"foo \nbar".to_string(),
" foo bar \nbaz".to_string(),
"foo bar baz".to_string(),
"foobarbaz\n\n".to_string()];
assert_eq!(test_strs.len(), oracle_strs.len());
let mode = CompressWhitespace;
for i in range(0, test_strs.len()) {
let mut new_line_pos = ~[];
let (trimmed_str, _out) = transform_text(test_strs[i], mode, true, &mut new_line_pos);
assert_eq!(&trimmed_str, &oracle_strs[i])
}
}
#[test]
fn test_transform_compress_whitespace_newline() {
let test_strs : ~[String] = ~[" foo bar".to_string(),
"foo bar ".to_string(),
"foo\n bar".to_string(),
"foo \nbar".to_string(),
" foo bar \nbaz".to_string(),
"foo bar baz".to_string(),
"foobarbaz\n\n".to_string()];
let oracle_strs : ~[String] = ~["foo bar".to_string(),
"foo bar ".to_string(),
"foo bar".to_string(),
"foo bar".to_string(),
" foo bar baz".to_string(),
"foo bar baz".to_string(),
"foobarbaz ".to_string()];
assert_eq!(test_strs.len(), oracle_strs.len());
let mode = CompressWhitespaceNewline;
for i in range(0, test_strs.len()) {
let mut new_line_pos = ~[];
let (trimmed_str, _out) = transform_text(test_strs[i], mode, true, &mut new_line_pos);
assert_eq!(&trimmed_str, &oracle_strs[i])
}
}
*/
#[test]
fn test_transform_compress_whitespace_newline_no_incoming() {
let test_strs = vec!(
" foo bar",
"\nfoo bar",
"foo bar ",
"foo\n bar",
"foo \nbar",
" foo bar \nbaz",
"foo bar baz",
"foobarbaz\n\n"
);
let oracle_strs = vec!(
" foo bar",
" foo bar",
"foo bar ",
"foo bar",
"foo bar",
" foo bar baz",
"foo bar baz",
"foobarbaz "
);
assert_eq!(test_strs.len(), oracle_strs.len());
let mode = CompressWhitespaceNewline;
for (test, oracle) in test_strs.iter().zip(oracle_strs.iter()) {
let mut new_line_pos = vec!();
let (trimmed_str, _out) = transform_text(*test, mode, false, &mut new_line_pos);
assert_eq!(trimmed_str.as_slice(), *oracle)
}
}