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Canvas: added support for the globalAlpha attribute.

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This commit is contained in:
Mátyás Mustoha 2015-04-04 00:05:52 +02:00
parent 83d9ab3ba5
commit 5c560397eb
12 changed files with 29 additions and 56 deletions
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15
components/script/dom/canvasrenderingcontext2d.rs
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@ -49,6 +49,7 @@ pub struct CanvasRenderingContext2D {
global: GlobalField,
renderer: Sender<CanvasMsg>,
canvas: JS<HTMLCanvasElement>,
global_alpha: Cell<f64>,
image_smoothing_enabled: Cell<bool>,
stroke_color: Cell<RGBA>,
line_width: Cell<f64>,
@ -70,6 +71,7 @@ impl CanvasRenderingContext2D {
global: GlobalField::from_rooted(&global),
renderer: CanvasPaintTask::start(size),
canvas: JS::from_rooted(canvas),
global_alpha: Cell::new(1.0),
image_smoothing_enabled: Cell::new(true),
stroke_color: Cell::new(black),
line_width: Cell::new(1.0),
@ -342,6 +344,19 @@ impl<'a> CanvasRenderingContext2DMethods for JSRef<'a, CanvasRenderingContext2D>
self.update_transform()
}
fn GlobalAlpha(self) -> f64 {
self.global_alpha.get()
}
fn SetGlobalAlpha(self, alpha: f64) {
if !alpha.is_finite() || alpha > 1.0 || alpha < 0.0 {
return;
}
self.global_alpha.set(alpha);
self.renderer.send(CanvasMsg::SetGlobalAlpha(alpha as f32)).unwrap()
}
fn FillRect(self, x: f64, y: f64, width: f64, height: f64) {
if !(x.is_finite() && y.is_finite() &&
width.is_finite() && height.is_finite()) {