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Implement sideways text.

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This commit is contained in:
Simon Sapin 2014-08-22 22:49:32 +01:00
parent db80b76d0a
commit 80704aeabd
6 changed files with 126 additions and 37 deletions
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80
src/components/gfx/display_list/mod.rs
View file

@ -21,7 +21,7 @@ use text::TextRun;
use collections::dlist::DList;
use collections::dlist;
use geom::{Point2D, Rect, SideOffsets2D, Size2D};
use geom::{Point2D, Rect, SideOffsets2D, Size2D, Matrix2D};
use libc::uintptr_t;
use servo_net::image::base::Image;
use servo_util::geometry::Au;
@ -337,10 +337,11 @@ impl DisplayList {
/// 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) {
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)
item.draw_into_context(render_context, current_transform)
}
debug!("Ending display list.");
}
@ -483,6 +484,16 @@ pub struct TextDisplayItem {
/// 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.
@ -560,7 +571,8 @@ impl<'a> Iterator<&'a DisplayItem> for DisplayItemIterator<'a> {
impl DisplayItem {
/// Renders this display item into the given render context.
fn draw_into_context(&self, render_context: &mut RenderContext) {
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);
@ -572,31 +584,61 @@ impl DisplayItem {
ClipDisplayItemClass(ref clip) => {
render_context.draw_push_clip(&clip.base.bounds);
for item in clip.children.iter() {
(*item).draw_into_context(render_context);
(*item).draw_into_context(render_context, current_transform);
}
render_context.draw_pop_clip();
}
TextDisplayItemClass(ref text) => {
debug!("Drawing text at {:?}.", text.base.bounds);
debug!("Drawing text at {}.", text.base.bounds);
// FIXME(pcwalton): Allocating? Why?
let text_run = text.text_run.clone();
// Optimization: Don’t set a transform matrix for upright text,
// and pass a strart point to `draw_text_into_context`.
// For sideways text, it’s easier to do the rotation such that its center
// (the baseline’s 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()
}
};
let font = render_context.font_ctx.get_render_font_from_template(
&text_run.font_template,
text_run.pt_size,
render_context.opts.render_backend);
let font = font.borrow();
let origin = text.base.bounds.origin;
let baseline_origin = Point2D(origin.x, origin.y + text_run.font_metrics.ascent);
{
font.draw_text_into_context(render_context,
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);
text.text_color
);
// Undo the transform, only when we did one.
if text.orientation != Upright {
render_context.draw_target.set_transform(current_transform)
}
}

2
src/components/gfx/render_task.rs
View file

@ -352,7 +352,7 @@ impl<C:RenderListener + Send> RenderTask<C> {
// Draw the display list.
profile(time::RenderingDrawingCategory, self.time_profiler_chan.clone(), || {
display_list.draw_into_context(&mut ctx);
display_list.draw_into_context(&mut ctx, &matrix);
ctx.draw_target.flush();
});
}

21
src/components/layout/fragment.rs
View file

@ -29,6 +29,7 @@ use gfx::display_list::{ImageDisplayItemClass, LineDisplayItem};
use gfx::display_list::{LineDisplayItemClass, OpaqueNode, PseudoDisplayItemClass};
use gfx::display_list::{SolidColorDisplayItem, SolidColorDisplayItemClass, StackingLevel};
use gfx::display_list::{TextDisplayItem, TextDisplayItemClass};
use gfx::display_list::{Upright, SidewaysLeft, SidewaysRight};
use gfx::font::FontStyle;
use gfx::text::glyph::CharIndex;
use gfx::text::text_run::TextRun;
@ -935,12 +936,31 @@ impl Fragment {
TableColumnFragment(_) => fail!("Shouldn't see table column fragments here."),
ScannedTextFragment(ref text_fragment) => {
// Create the text display item.
let orientation = if self.style.writing_mode.is_vertical() {
if self.style.writing_mode.is_sideways_left() {
SidewaysLeft
} else {
SidewaysRight
}
} else {
Upright
};
let metrics = &text_fragment.run.font_metrics;
let baseline_origin ={
let mut tmp = content_box.start;
tmp.b = tmp.b + metrics.ascent;
tmp.to_physical(self.style.writing_mode, container_size) + flow_origin
};
let text_display_item = box TextDisplayItem {
base: BaseDisplayItem::new(
absolute_content_box, self.node, ContentStackingLevel),
text_run: text_fragment.run.clone(),
range: text_fragment.range,
text_color: self.style().get_color().color.to_gfx_color(),
orientation: orientation,
baseline_origin: baseline_origin,
};
accumulator.push(display_list, TextDisplayItemClass(text_display_item));
@ -965,7 +985,6 @@ impl Fragment {
let text_decorations =
self.style().get_inheritedtext()._servo_text_decorations_in_effect;
let metrics = &text_fragment.run.font_metrics;
line(text_decorations.underline, || {
let mut rect = content_box.clone();
rect.start.b = rect.start.b + metrics.ascent - metrics.underline_offset;

9
src/components/layout/inline.rs
View file

@ -1100,12 +1100,9 @@ impl Flow for InlineFlow {
line_distance_from_flow_block_start = line_distance_from_flow_block_start + line.bounds.size.block;
} // End of `lines.each` loop.
self.base.position.size.block =
if self.lines.len() > 0 {
self.lines.as_slice().last().get_ref().bounds.start.b +
self.lines.as_slice().last().get_ref().bounds.size.block
} else {
Au::new(0)
self.base.position.size.block = match self.lines.as_slice().last() {
Some(ref last_line) => last_line.bounds.start.b + last_line.bounds.size.block,
None => Au::new(0)
};
self.base.floats = scanner.floats();

40
src/components/layout/text.rs
View file

@ -9,16 +9,16 @@
use flow::Flow;
use fragment::{Fragment, ScannedTextFragment, ScannedTextFragmentInfo, UnscannedTextFragment};
use gfx::font::{FontMetrics, FontStyle};
use gfx::font::{FontMetrics, FontStyle, RunMetrics};
use gfx::font_context::FontContext;
use gfx::text::glyph::CharIndex;
use gfx::text::text_run::TextRun;
use gfx::text::util::{CompressWhitespaceNewline, transform_text, CompressNone};
use servo_util::geometry::Au;
use servo_util::logical_geometry::LogicalSize;
use servo_util::logical_geometry::{LogicalSize, WritingMode};
use servo_util::range::Range;
use style::ComputedValues;
use style::computed_values::{font_family, line_height, white_space};
use style::computed_values::{font_family, line_height, text_orientation, white_space};
use sync::Arc;
struct NewLinePositions {
@ -150,8 +150,8 @@ impl TextRunScanner {
*text);
let range = Range::new(CharIndex(0), run.char_len());
let new_metrics = run.metrics_for_range(&range);
let bounding_box_size = LogicalSize::from_physical(
old_fragment.style.writing_mode, new_metrics.bounding_box.size);
let bounding_box_size = bounding_box_for_run_metrics(
&new_metrics, old_fragment.style.writing_mode);
let new_text_fragment_info = ScannedTextFragmentInfo::new(Arc::new(run), range);
let mut new_fragment = old_fragment.transform(
bounding_box_size, ScannedTextFragment(new_text_fragment_info));
@ -234,8 +234,8 @@ impl TextRunScanner {
let new_text_fragment_info = ScannedTextFragmentInfo::new(run.get_ref().clone(), range);
let old_fragment = &in_fragments[i.to_uint()];
let new_metrics = new_text_fragment_info.run.metrics_for_range(&range);
let bounding_box_size = LogicalSize::from_physical(
old_fragment.style.writing_mode, new_metrics.bounding_box.size);
let bounding_box_size = bounding_box_for_run_metrics(
&new_metrics, old_fragment.style.writing_mode);
let mut new_fragment = old_fragment.transform(
bounding_box_size, ScannedTextFragment(new_text_fragment_info));
new_fragment.new_line_pos = new_line_positions[logical_offset.to_uint()].new_line_pos.clone();
@ -251,6 +251,32 @@ impl TextRunScanner {
} // End of `flush_clump_to_list`.
}
#[inline]
fn bounding_box_for_run_metrics(metrics: &RunMetrics, writing_mode: WritingMode)
-> LogicalSize<Au> {
// This does nothing, but it will fail to build
// when more values are added to the `text-orientation` CSS property.
// This will be a reminder to update the code below.
let dummy: Option<text_orientation::T> = None;
match dummy {
Some(text_orientation::sideways_right) |
Some(text_orientation::sideways_left) |
Some(text_orientation::sideways) |
None => {}
}
// In vertical sideways or horizontal upgright text,
// the "width" of text metrics is always inline
// This will need to be updated when other text orientations are supported.
LogicalSize::new(
writing_mode,
metrics.bounding_box.size.width,
metrics.bounding_box.size.height)
}
/// Returns the metrics of the font represented by the given `FontStyle`, respectively.
///
/// `#[inline]` because often the caller only needs a few fields from the font metrics.

5
src/components/util/logical_geometry.rs
View file

@ -41,6 +41,11 @@ impl WritingMode {
pub fn is_bidi_ltr(&self) -> bool {
!self.intersects(FlagRTL)
}
#[inline]
pub fn is_sideways_left(&self) -> bool {
self.intersects(FlagSidewaysLeft)
}
}
impl Show for WritingMode {