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layout: Implement mix-blend-mode per COMPOSITING § 3.4.1.

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`background-blend-mode` is not yet supported because we don't support
multiple backgrounds yet.
This commit is contained in:
Patrick Walton 2015-01-08 13:53:17 -08:00
parent 3897547bc2
commit 97d3443003
10 changed files with 181 additions and 23 deletions
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13
components/gfx/display_list/mod.rs
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@ -41,7 +41,7 @@ use std::fmt;
use std::slice::Items;
use std::sync::Arc;
use style::ComputedValues;
use style::computed_values::{border_style, cursor, filter, pointer_events};
use style::computed_values::{border_style, cursor, filter, mix_blend_mode, pointer_events};
// It seems cleaner to have layout code not mention Azure directly, so let's just reexport this for
// layout to use.
@ -165,6 +165,8 @@ pub struct StackingContext {
pub z_index: i32,
/// CSS filters to be applied to this stacking context (including opacity).
pub filters: filter::T,
/// The blend mode with which this stacking context blends with its backdrop.
pub blend_mode: mix_blend_mode::T,
}
impl StackingContext {
@ -175,6 +177,7 @@ impl StackingContext {
overflow: &Rect<Au>,
z_index: i32,
filters: filter::T,
blend_mode: mix_blend_mode::T,
layer: Option<Arc<PaintLayer>>)
-> StackingContext {
StackingContext {
@ -184,6 +187,7 @@ impl StackingContext {
overflow: *overflow,
z_index: z_index,
filters: filters,
blend_mode: blend_mode,
}
}
@ -194,7 +198,7 @@ impl StackingContext {
transform: &Matrix2D<AzFloat>,
clip_rect: Option<&Rect<Au>>) {
let temporary_draw_target =
paint_context.get_or_create_temporary_draw_target(&self.filters);
paint_context.get_or_create_temporary_draw_target(&self.filters, self.blend_mode);
{
let mut paint_subcontext = PaintContext {
draw_target: temporary_draw_target.clone(),
@ -307,7 +311,8 @@ impl StackingContext {
}
paint_context.draw_temporary_draw_target_if_necessary(&temporary_draw_target,
&self.filters)
&self.filters,
self.blend_mode)
}
/// Translate the given tile rect into the coordinate system of a child stacking context.
@ -849,7 +854,7 @@ impl DisplayItem {
bounds.origin.y = bounds.origin.y + y_offset;
bounds.size = image_item.stretch_size;
paint_context.draw_image(bounds, image_item.image.clone());
paint_context.draw_image(&bounds, image_item.image.clone());
x_offset = x_offset + image_item.stretch_size.width;
}