Bug 663190 - Calling strokeRect with zero width or height should do nothing; r=smaug

content/canvas/src/nsCanvasRenderingContext2D.cpp

@@ -2028,6 +2028,9 @@ nsCanvasRenderingContext2D::FillRect(float x, float y, float w, float h)
 NS_IMETHODIMP
 nsCanvasRenderingContext2D::StrokeRect(float x, float y, float w, float h)
 {
+    if (w == 0.f && h == 0.f) {
+        return NS_OK;
+    }
     return DrawRect(gfxRect(x, y, w, h), STYLE_STROKE);
 }
 

content/canvas/test/test_canvas.html

@@ -18395,7 +18395,7 @@ ctx.lineWidth = 250;
 ctx.lineCap = 'round';
 ctx.lineJoin = 'round';
 ctx.strokeRect(50, 25, 0, 0);
-todo_isPixel(ctx, 50,25, 0,0,0,0, 0);
+isPixel(ctx, 50,25, 0,0,0,0, 0);
 
 
 }