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Add support for linear gradients, implemented as skia shaders.

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I had to complicate the IDL bindings generation to allow passing an array of
colors. Without these changes, we'd try to convert the dart object to
Vector<SkColor>, which C++ thinks is Vector<unsigned>, and we'd use the wrong
converter. So I added some template grease to force it to use a
Vector<CanvasColor> converter.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1152963009
This commit is contained in:
Matt Perry 2015-06-08 13:49:10 -04:00
parent 1526e5f8e0
commit 1f26d65757
1 changed files with 5 additions and 1 deletions
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6
examples/raw/painting.sky
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@ -26,8 +26,12 @@ void main() {
paint.color = const Color.fromARGB(128, 255, 0, 255);
context.rotateDegrees(45.0);
Gradient yellowBlue = new Gradient.Linear(
[new Point(-radius, -radius), new Point(0.0, 0.0)],
[const Color(0xFFFFFF00), const Color(0xFF0000FF)],
null);
context.drawRect(new Rect.fromLTRB(-radius, -radius, radius, radius),
paint);
new Paint()..setShader(yellowBlue));
// Scale x and y by 0.5.
var scaleMatrix = new Float32List.fromList([