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Implement new Webrender PushTextShadow API
Also includes an incidental bugfix for the rendering order of text decorations. This change depends on servo/webrender#1454 being merged and upstreamed to servo.
This commit is contained in:
Alexis Beingessner
Martin Robinson
parent
1b6d29e319
commit
2d3eae3e3a
3 changed files with 106 additions and 67 deletions
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@ -25,10 +25,10 @@ use gfx::display_list::{BLUR_INFLATION_FACTOR, BaseDisplayItem, BorderDetails, B
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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, ImageBorder, ImageDisplayItem};
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use gfx::display_list::{LineDisplayItem, NormalBorder, OpaqueNode, RadialGradientDisplayItem};
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use gfx::display_list::{ScrollRoot, ScrollRootType, SolidColorDisplayItem, StackingContext};
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use gfx::display_list::{StackingContextType, TextDisplayItem, TextOrientation, WebGLDisplayItem};
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use gfx::display_list::WebRenderImageInfo;
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use gfx::display_list::{LineDisplayItem, NormalBorder, OpaqueNode, PushTextShadowDisplayItem};
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use gfx::display_list::{PopTextShadowDisplayItem, RadialGradientDisplayItem, ScrollRoot};
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use gfx::display_list::{ScrollRootType, SolidColorDisplayItem, StackingContext, StackingContextType};
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use gfx::display_list::{TextDisplayItem, TextOrientation, WebGLDisplayItem, WebRenderImageInfo};
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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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@ -525,7 +525,7 @@ pub trait FragmentDisplayListBuilding {
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state: &mut DisplayListBuildState,
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text_fragment: &ScannedTextFragmentInfo,
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stacking_relative_content_box: &Rect<Au>,
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text_shadow: Option<&SimpleShadow>,
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text_shadows: &[SimpleShadow],
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clip: &Rect<Au>);
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/// Creates the display item for a text decoration: underline, overline, or line-through.
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@ -533,8 +533,7 @@ pub trait FragmentDisplayListBuilding {
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state: &mut DisplayListBuildState,
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color: &RGBA,
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stacking_relative_box: &LogicalRect<Au>,
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clip: &Rect<Au>,
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blur: Au);
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clip: &Rect<Au>);
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/// A helper method that `build_display_list` calls to create per-fragment-type display items.
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fn build_fragment_type_specific_display_items(&mut self,
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@ -1878,24 +1877,11 @@ impl FragmentDisplayListBuilding for Fragment {
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..
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}) |
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SpecificFragmentInfo::ScannedText(box ref text_fragment) => {
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// Create items for shadows.
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//
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// NB: According to CSS-BACKGROUNDS, text shadows render in *reverse* order (front
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// to back).
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for text_shadow in self.style.get_inheritedtext().text_shadow.0.iter().rev() {
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self.build_display_list_for_text_fragment(state,
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&*text_fragment,
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&stacking_relative_content_box,
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Some(text_shadow),
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clip);
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}
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// Create the main text display item.
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self.build_display_list_for_text_fragment(state,
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&*text_fragment,
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&stacking_relative_content_box,
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None,
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&self.style.get_inheritedtext().text_shadow.0,
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clip);
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if opts::get().show_debug_fragment_borders {
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@ -2077,22 +2063,20 @@ impl FragmentDisplayListBuilding for Fragment {
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state: &mut DisplayListBuildState,
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text_fragment: &ScannedTextFragmentInfo,
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stacking_relative_content_box: &Rect<Au>,
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text_shadow: Option<&SimpleShadow>,
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text_shadows: &[SimpleShadow],
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clip: &Rect<Au>) {
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// NB: The order for painting text components (CSS Text Decoration Module Level 3) is:
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// shadows, underline, overline, text, text-emphasis, and then line-through.
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// TODO(emilio): Allow changing more properties by ::selection
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let text_color = if let Some(shadow) = text_shadow {
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// If we're painting a shadow, paint the text the same color as the shadow.
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self.style().resolve_color(shadow.color)
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} else if text_fragment.selected() {
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// Otherwise, paint the text with the color as described in its styling.
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// Paint the text with the color as described in its styling.
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let text_color = if text_fragment.selected() {
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self.selected_style().get_color().color
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} else {
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self.style().get_color().color
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};
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let offset = text_shadow.map_or(Vector2D::zero(), |s| {
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Vector2D::new(s.horizontal, s.vertical)
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});
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let shadow_blur_radius = text_shadow.map(|s| s.blur).unwrap_or(Au(0));
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// Determine the orientation and cursor to use.
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let (orientation, cursor) = if self.style.writing_mode.is_vertical() {
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@ -2108,28 +2092,32 @@ impl FragmentDisplayListBuilding for Fragment {
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// FIXME(pcwalton): Get the real container size.
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let container_size = Size2D::zero();
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let metrics = &text_fragment.run.font_metrics;
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let stacking_relative_content_box = stacking_relative_content_box.translate(&offset);
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let baseline_origin = stacking_relative_content_box.origin +
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LogicalPoint::new(self.style.writing_mode,
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Au(0),
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metrics.ascent).to_physical(self.style.writing_mode,
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container_size).to_vector();
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// Create the text display item.
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// Base item for all text/shadows
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let base = state.create_base_display_item(&stacking_relative_content_box,
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LocalClip::from(clip.to_rectf()),
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self.node,
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self.style().get_cursor(cursor),
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DisplayListSection::Content);
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state.add_display_item(DisplayItem::Text(box TextDisplayItem {
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base: base,
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text_run: text_fragment.run.clone(),
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range: text_fragment.range,
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text_color: text_color.to_gfx_color(),
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orientation: orientation,
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baseline_origin: baseline_origin,
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blur_radius: shadow_blur_radius,
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}));
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// NB: According to CSS-BACKGROUNDS, text shadows render in *reverse* order (front
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// to back).
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// Shadows
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for shadow in text_shadows.iter().rev() {
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state.add_display_item(DisplayItem::PushTextShadow(box PushTextShadowDisplayItem {
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base: base.clone(),
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blur_radius: shadow.blur,
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offset: Vector2D::new(shadow.horizontal, shadow.vertical),
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color: self.style().resolve_color(shadow.color).to_gfx_color(),
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}));
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}
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// Create display items for text decorations.
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let mut text_decorations = self.style()
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@ -2142,8 +2130,10 @@ impl FragmentDisplayListBuilding for Fragment {
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let stacking_relative_content_box =
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LogicalRect::from_physical(self.style.writing_mode,
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stacking_relative_content_box,
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*stacking_relative_content_box,
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container_size);
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// Underline
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if let Some(ref underline_color) = text_decorations.underline {
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let mut stacking_relative_box = stacking_relative_content_box;
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stacking_relative_box.start.b = stacking_relative_content_box.start.b +
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@ -2152,20 +2142,35 @@ impl FragmentDisplayListBuilding for Fragment {
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self.build_display_list_for_text_decoration(state,
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underline_color,
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&stacking_relative_box,
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clip,
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shadow_blur_radius);
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clip);
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}
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// Overline
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if let Some(ref overline_color) = text_decorations.overline {
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let mut stacking_relative_box = stacking_relative_content_box;
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stacking_relative_box.size.block = metrics.underline_size;
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self.build_display_list_for_text_decoration(state,
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overline_color,
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&stacking_relative_box,
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clip,
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shadow_blur_radius);
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clip);
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}
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// Text
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state.add_display_item(DisplayItem::Text(box TextDisplayItem {
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base: base.clone(),
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text_run: text_fragment.run.clone(),
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range: text_fragment.range,
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text_color: text_color.to_gfx_color(),
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orientation: orientation,
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baseline_origin: baseline_origin,
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}));
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// TODO(#17715): emit text-emphasis marks here.
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// (just push another TextDisplayItem?)
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// Line-Through
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if let Some(ref line_through_color) = text_decorations.line_through {
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let mut stacking_relative_box = stacking_relative_content_box;
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stacking_relative_box.start.b = stacking_relative_box.start.b + metrics.ascent -
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@ -2174,8 +2179,14 @@ impl FragmentDisplayListBuilding for Fragment {
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self.build_display_list_for_text_decoration(state,
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line_through_color,
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&stacking_relative_box,
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clip,
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shadow_blur_radius);
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clip);
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}
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// Pair all the PushTextShadows
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for _ in text_shadows {
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state.add_display_item(DisplayItem::PopTextShadow(box PopTextShadowDisplayItem {
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base: base.clone(),
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}));
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}
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}
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@ -2183,31 +2194,21 @@ impl FragmentDisplayListBuilding for Fragment {
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state: &mut DisplayListBuildState,
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color: &RGBA,
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stacking_relative_box: &LogicalRect<Au>,
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clip: &Rect<Au>,
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blur_radius: Au) {
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// Perhaps surprisingly, text decorations are box shadows. This is because they may need
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// to have blur in the case of `text-shadow`, and this doesn't hurt performance because box
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// shadows are optimized into essentially solid colors if there is no need for the blur.
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//
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clip: &Rect<Au>) {
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// FIXME(pcwalton, #2795): Get the real container size.
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let container_size = Size2D::zero();
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let stacking_relative_box = stacking_relative_box.to_physical(self.style.writing_mode,
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container_size);
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let base = state.create_base_display_item(
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&shadow_bounds(&stacking_relative_box, blur_radius, Au(0)),
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&stacking_relative_box,
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LocalClip::from(clip.to_rectf()),
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self.node,
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self.style.get_cursor(Cursor::Default),
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DisplayListSection::Content);
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state.add_display_item(DisplayItem::BoxShadow(box BoxShadowDisplayItem {
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state.add_display_item(DisplayItem::SolidColor(box SolidColorDisplayItem {
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base: base,
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box_bounds: stacking_relative_box,
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color: color.to_gfx_color(),
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offset: Vector2D::zero(),
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blur_radius: blur_radius,
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spread_radius: Au(0),
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border_radius: Au(0),
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clip_mode: BoxShadowClipMode::None,
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}));
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}
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