Parse currentColor as Canvas2D color

1 files changed, 24 insertions, 2 deletions

diff --git a/components/script/dom/canvasrenderingcontext2d.rs b/components/script/dom/canvasrenderingcontext2d.rs
index 4f307a5c127..2954fbb332e 100644
--- a/components/script/dom/canvasrenderingcontext2d.rs
+++ b/components/script/dom/canvasrenderingcontext2d.rs
@@ -9,10 +9,12 @@ use canvas_traits::{FillOrStrokeStyle, LinearGradientStyle, RadialGradientStyle,
 use cssparser::Color as CSSColor;
 use cssparser::{Parser, RGBA};
 use dom::bindings::cell::DOMRefCell;
+use dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationMethods;
 use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding;
 use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasRenderingContext2DMethods;
 use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasWindingRule;
 use dom::bindings::codegen::Bindings::ImageDataBinding::ImageDataMethods;
+use dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
 use dom::bindings::codegen::UnionTypes::HTMLImageElementOrHTMLCanvasElementOrCanvasRenderingContext2D;
 use dom::bindings::codegen::UnionTypes::StringOrCanvasGradientOrCanvasPattern;
 use dom::bindings::error::{Error, Fallible};
@@ -439,6 +441,26 @@ impl CanvasRenderingContext2D {
                        Size2D::new(w as f32, h as f32)))
     }
 
+    fn parse_color(&self, string: &str) -> Result<RGBA,()> {
+        let mut parser = Parser::new(&string);
+        let color = CSSColor::parse(&mut parser);
+        if parser.is_exhausted() {
+            match color {
+                Ok(CSSColor::RGBA(rgba)) => Ok(rgba),
+                Ok(CSSColor::CurrentColor) => {
+                    // TODO: will need to check that the context bitmap mode is fixed
+                    // once we implement CanvasProxy
+                    let window = window_from_node(&*self.canvas);
+                    let style = window.GetComputedStyle(&*self.canvas.upcast(), None);
+                    self.parse_color(&style.GetPropertyValue(DOMString::from("color")))
+                },
+                _ => Err(())
+            }
+        } else {
+            Err(())
+        }
+    }
+
     pub fn get_renderer_id(&self) -> usize {
         self.renderer_id
     }
@@ -844,7 +866,7 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
     fn SetStrokeStyle(&self, value: StringOrCanvasGradientOrCanvasPattern) {
         match value {
             StringOrCanvasGradientOrCanvasPattern::eString(string) => {
-                match parse_color(&string) {
+                match self.parse_color(&string) {
                     Ok(rgba) => {
                         self.state.borrow_mut().stroke_style = CanvasFillOrStrokeStyle::Color(rgba);
                         self.ipc_renderer
@@ -884,7 +906,7 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
     fn SetFillStyle(&self, value: StringOrCanvasGradientOrCanvasPattern) {
         match value {
             StringOrCanvasGradientOrCanvasPattern::eString(string) => {
-                if let Ok(rgba) = parse_color(&string) {
+                if let Ok(rgba) = self.parse_color(&string) {
                     self.state.borrow_mut().fill_style = CanvasFillOrStrokeStyle::Color(rgba);
                     self.ipc_renderer
                         .send(CanvasMsg::Canvas2d(Canvas2dMsg::SetFillStyle(