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https://github.com/servo/servo.git
synced 2025-08-06 14:10:11 +01:00
Partially implement radial gradients.
Missing: repeating radial gradients and keyword sizes.
This commit is contained in:
Pyfisch
parent
2c445169ad
commit
f4bad2d920
4 changed files with 194 additions and 83 deletions
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@ -25,7 +25,7 @@ use gfx::display_list::{BLUR_INFLATION_FACTOR, BaseDisplayItem, BorderDetails};
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use gfx::display_list::{BorderDisplayItem, ImageBorder, NormalBorder};
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use gfx::display_list::{BorderRadii, BoxShadowClipMode, BoxShadowDisplayItem, ClippingRegion};
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use gfx::display_list::{DisplayItem, DisplayItemMetadata, DisplayList, DisplayListSection};
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use gfx::display_list::{GradientDisplayItem, IframeDisplayItem, ImageDisplayItem};
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use gfx::display_list::{GradientDisplayItem, RadialGradientDisplayItem, IframeDisplayItem, ImageDisplayItem};
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use gfx::display_list::{LineDisplayItem, OpaqueNode};
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use gfx::display_list::{SolidColorDisplayItem, ScrollRoot, StackingContext, StackingContextType};
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use gfx::display_list::{TextDisplayItem, TextOrientation, WebGLDisplayItem, WebRenderImageInfo};
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@ -33,7 +33,7 @@ use gfx_traits::{combine_id_with_fragment_type, FragmentType, StackingContextId}
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use inline::{FIRST_FRAGMENT_OF_ELEMENT, InlineFlow, LAST_FRAGMENT_OF_ELEMENT};
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use ipc_channel::ipc;
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use list_item::ListItemFlow;
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use model::{self, MaybeAuto};
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use model::{self, MaybeAuto, specified};
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use msg::constellation_msg::PipelineId;
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use net_traits::image::base::PixelFormat;
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use net_traits::image_cache::UsePlaceholder;
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@ -58,8 +58,9 @@ use style::properties::longhands::border_image_repeat::computed_value::RepeatKey
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use style::properties::style_structs;
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use style::servo::restyle_damage::REPAINT;
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use style::values::{Either, RGBA, computed};
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use style::values::computed::{AngleOrCorner, Gradient, GradientItem, GradientKind};
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use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrAuto, NumberOrPercentage};
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use style::values::computed::{AngleOrCorner, Gradient, GradientKind, LengthOrPercentage, LengthOrPercentageOrAuto};
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use style::values::computed::{LengthOrKeyword, LengthOrPercentageOrKeyword, NumberOrPercentage};
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use style::values::computed::image::{ColorStop, EndingShape, SizeKeyword};
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use style::values::specified::{HorizontalDirection, VerticalDirection};
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use style_traits::CSSPixel;
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use style_traits::cursor::Cursor;
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@ -391,6 +392,12 @@ pub trait FragmentDisplayListBuilding {
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style: &ServoComputedValues)
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-> Option<display_list::Gradient>;
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fn convert_radial_gradient(&self,
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absolute_bounds: &Rect<Au>,
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gradient: &Gradient,
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style: &ServoComputedValues)
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-> Option<display_list::RadialGradient>;
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/// Adds the display items necessary to paint the background linear gradient of this fragment
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/// to the appropriate section of the display list.
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fn build_display_list_for_background_gradient(&self,
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@ -588,6 +595,85 @@ fn build_border_radius_for_inner_rect(outer_rect: &Rect<Au>,
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radii
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}
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fn convert_gradient_stops(gradient_stops: &[ColorStop],
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length: Au,
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style: &ServoComputedValues) -> Vec<GradientStop> {
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// Determine the position of each stop per CSS-IMAGES § 3.4.
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//
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// FIXME(#3908, pcwalton): Make sure later stops can't be behind earlier stops.
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let stop_items = gradient.items.iter().filter_map(|item| {
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match *item {
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GradientItem::ColorStop(ref stop) => Some(stop),
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_ => None,
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}
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}).collect::<Vec<_>>();
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let mut stops = Vec::with_capacity(stop_items.len());
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let mut stop_run = None;
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for (i, stop) in stop_items.iter().enumerate() {
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let offset = match stop.position {
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None => {
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if stop_run.is_none() {
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// Initialize a new stop run.
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let start_offset = if i == 0 {
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0.0
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} else {
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// `unwrap()` here should never fail because this is the beginning of
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// a stop run, which is always bounded by a length or percentage.
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position_to_offset(stop_items[i - 1].position.unwrap(), length)
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};
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let (end_index, end_offset) =
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match stop_items[i..]
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.iter()
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.enumerate()
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.find(|&(_, ref stop)| stop.position.is_some()) {
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None => (stop_items.len() - 1, 1.0),
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Some((end_index, end_stop)) => {
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// `unwrap()` here should never fail because this is the end of
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// a stop run, which is always bounded by a length or
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// percentage.
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(end_index,
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position_to_offset(end_stop.position.unwrap(), length))
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}
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};
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stop_run = Some(StopRun {
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start_offset: start_offset,
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end_offset: end_offset,
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start_index: i,
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stop_count: end_index - i,
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})
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}
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let stop_run = stop_run.unwrap();
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let stop_run_length = stop_run.end_offset - stop_run.start_offset;
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if stop_run.stop_count == 0 {
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stop_run.end_offset
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} else {
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stop_run.start_offset +
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stop_run_length * (i - stop_run.start_index) as f32 /
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(stop_run.stop_count as f32)
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}
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}
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Some(position) => {
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stop_run = None;
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position_to_offset(position, length)
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}
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};
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stops.push(GradientStop {
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offset: offset,
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color: style.resolve_color(stop.color).to_gfx_color()
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})
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}
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stops
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}
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fn convert_size_keyword(_keyword: SizeKeyword,
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_circle: bool,
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_size: &Size2D<Au>,
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_center: &Point2D<Au>) -> Size2D<Au> {
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println!("TODO Implement size-keyword for radial gradients.");
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return Size2D::zero();
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}
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impl FragmentDisplayListBuilding for Fragment {
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fn build_display_list_for_background_if_applicable(&self,
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state: &mut DisplayListBuildState,
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@ -653,15 +739,12 @@ impl FragmentDisplayListBuilding for Fragment {
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match background_image.0 {
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None => {}
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Some(computed::Image::Gradient(ref gradient)) => {
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// FIXME: Radial gradients aren't implemented yet.
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if let GradientKind::Linear(_) = gradient.gradient_kind {
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self.build_display_list_for_background_gradient(state,
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display_list_section,
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&bounds,
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&clip,
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gradient,
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style);
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}
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self.build_display_list_for_background_gradient(state,
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display_list_section,
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&bounds,
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&clip,
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gradient,
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style);
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}
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Some(computed::Image::Url(ref image_url)) => {
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if let Some(url) = image_url.url() {
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@ -923,7 +1006,6 @@ impl FragmentDisplayListBuilding for Fragment {
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}
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}
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} else {
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// FIXME: Radial gradients aren't implemented yet.
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return None;
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};
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@ -945,71 +1027,9 @@ impl FragmentDisplayListBuilding for Fragment {
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let length = Au::from_f32_px(
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(delta.x.to_f32_px() * 2.0).hypot(delta.y.to_f32_px() * 2.0));
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// Determine the position of each stop per CSS-IMAGES § 3.4.
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//
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// FIXME(#3908, pcwalton): Make sure later stops can't be behind earlier stops.
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let stop_items = gradient.items.iter().filter_map(|item| {
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match *item {
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GradientItem::ColorStop(ref stop) => Some(stop),
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_ => None,
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}
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}).collect::<Vec<_>>();
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let mut stops = Vec::with_capacity(stop_items.len());
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let mut stop_run = None;
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for (i, stop) in stop_items.iter().enumerate() {
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let offset = match stop.position {
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None => {
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if stop_run.is_none() {
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// Initialize a new stop run.
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let start_offset = if i == 0 {
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0.0
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} else {
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// `unwrap()` here should never fail because this is the beginning of
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// a stop run, which is always bounded by a length or percentage.
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position_to_offset(stop_items[i - 1].position.unwrap(), length)
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};
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let (end_index, end_offset) =
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match stop_items[i..]
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.iter()
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.enumerate()
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.find(|&(_, ref stop)| stop.position.is_some()) {
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None => (stop_items.len() - 1, 1.0),
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Some((end_index, end_stop)) => {
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// `unwrap()` here should never fail because this is the end of
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// a stop run, which is always bounded by a length or
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// percentage.
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(end_index,
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position_to_offset(end_stop.position.unwrap(), length))
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}
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};
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stop_run = Some(StopRun {
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start_offset: start_offset,
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end_offset: end_offset,
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start_index: i,
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stop_count: end_index - i,
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})
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}
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let stop_run = stop_run.unwrap();
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let stop_run_length = stop_run.end_offset - stop_run.start_offset;
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if stop_run.stop_count == 0 {
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stop_run.end_offset
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} else {
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stop_run.start_offset +
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stop_run_length * (i - stop_run.start_index) as f32 /
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(stop_run.stop_count as f32)
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}
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}
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Some(position) => {
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stop_run = None;
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position_to_offset(position, length)
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}
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};
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stops.push(GradientStop {
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offset: offset,
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color: style.resolve_color(stop.color).to_gfx_color()
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})
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}
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let stops = convert_gradient_stops(&gradient.stops[..],
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length,
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style);
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let center = Point2D::new(absolute_bounds.size.width / 2,
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absolute_bounds.size.height / 2);
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@ -1021,6 +1041,43 @@ impl FragmentDisplayListBuilding for Fragment {
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})
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}
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fn convert_radial_gradient(&self,
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absolute_bounds: &Rect<Au>,
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gradient: &Gradient,
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style: &ServoComputedValues) -> Option<display_list::RadialGradient> {
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// FIXME: Repeating gradients aren't implemented yet.
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if gradient.repeating {
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return None;
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}
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if let GradientKind::Radial(ref shape, ref center) = gradient.gradient_kind {
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let center = Point2D::new(specified(center.horizontal, absolute_bounds.size.width),
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specified(center.vertical, absolute_bounds.size.height));
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let radius = match *shape {
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EndingShape::Circle(LengthOrKeyword::Length(length))
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=> Size2D::new(length, length),
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EndingShape::Circle(LengthOrKeyword::Keyword(word))
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=> convert_size_keyword(word, true, &absolute_bounds.size, ¢er),
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EndingShape::Ellipse(LengthOrPercentageOrKeyword::LengthOrPercentage(horizontal,
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vertical))
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=> Size2D::new(specified(horizontal, absolute_bounds.size.width),
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specified(vertical, absolute_bounds.size.height)),
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EndingShape::Ellipse(LengthOrPercentageOrKeyword::Keyword(word))
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=> convert_size_keyword(word, false, &absolute_bounds.size, ¢er),
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};
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let length = Au::from_f32_px(radius.width.to_f32_px().hypot(radius.height.to_f32_px()));
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let stops = convert_gradient_stops(&gradient.stops[..],
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length,
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style);
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Some(display_list::RadialGradient {
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center: absolute_bounds.origin + center,
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radius: radius,
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stops: stops,
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})
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} else {
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None
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}
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}
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fn build_display_list_for_background_gradient(&self,
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state: &mut DisplayListBuildState,
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display_list_section: DisplayListSection,
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@ -1031,9 +1088,7 @@ impl FragmentDisplayListBuilding for Fragment {
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let mut clip = clip.clone();
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clip.intersect_rect(absolute_bounds);
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let grad = self.convert_gradient(absolute_bounds, gradient, style);
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if let Some(x) = grad {
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if let Some(x) = self.convert_gradient(absolute_bounds, gradient, style) {
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let base = state.create_base_display_item(absolute_bounds,
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&clip,
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self.node,
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@ -1045,6 +1100,19 @@ impl FragmentDisplayListBuilding for Fragment {
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gradient: x,
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});
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state.add_display_item(gradient_display_item);
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} else if let Some(x) = self.convert_radial_gradient(absolute_bounds, gradient, style) {
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let base = state.create_base_display_item(absolute_bounds,
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&clip,
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self.node,
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style.get_cursor(Cursor::Default),
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display_list_section);
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let gradient_display_item = DisplayItem::RadialGradient(box RadialGradientDisplayItem {
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base: base,
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gradient: x,
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});
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state.add_display_item(gradient_display_item);
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}
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}
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