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Canvas: implement global composition and blending.

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This commit is contained in:
Mátyás Mustoha 2015-04-20 13:16:45 +02:00
parent 8efd70b01b
commit a8343a0750
31 changed files with 221 additions and 127 deletions
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21
components/script/dom/canvasrenderingcontext2d.rs
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@ -30,7 +30,7 @@ use geom::size::Size2D;
use canvas::canvas_msg::{CanvasMsg, Canvas2dMsg, CanvasCommonMsg};
use canvas::canvas_paint_task::{CanvasPaintTask, FillOrStrokeStyle};
use canvas::canvas_paint_task::{LinearGradientStyle, RadialGradientStyle};
use canvas::canvas_paint_task::{LineCapStyle, LineJoinStyle};
use canvas::canvas_paint_task::{LineCapStyle, LineJoinStyle, CompositionOrBlending};
use net_traits::image::base::Image;
use net_traits::image_cache_task::{ImageResponseMsg, Msg};
@ -61,6 +61,7 @@ pub struct CanvasRenderingContext2D {
#[jstraceable]
struct CanvasContextState {
global_alpha: f64,
global_composition: CompositionOrBlending,
image_smoothing_enabled: bool,
stroke_color: RGBA,
line_width: f64,
@ -81,6 +82,7 @@ impl CanvasContextState {
};
CanvasContextState {
global_alpha: 1.0,
global_composition: CompositionOrBlending::default(),
image_smoothing_enabled: true,
stroke_color: black,
line_width: 1.0,
@ -421,6 +423,23 @@ impl<'a> CanvasRenderingContext2DMethods for JSRef<'a, CanvasRenderingContext2D>
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetGlobalAlpha(alpha as f32))).unwrap()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-globalcompositeoperation
fn GlobalCompositeOperation(self) -> DOMString {
let state = self.state.borrow();
match state.global_composition {
CompositionOrBlending::Composition(op) => op.to_str().to_owned(),
CompositionOrBlending::Blending(op) => op.to_str().to_owned(),
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-globalcompositeoperation
fn SetGlobalCompositeOperation(self, op_str: DOMString) {
if let Some(op) = CompositionOrBlending::from_str(&op_str) {
self.state.borrow_mut().global_composition = op;
self.renderer.send(CanvasMsg::Canvas2d(Canvas2dMsg::SetGlobalComposition(op))).unwrap()
}
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-fillrect
fn FillRect(self, x: f64, y: f64, width: f64, height: f64) {
if let Some(rect) = self.create_drawable_rect(x, y, width, height) {