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Add a GM to test the clipping of canvas layers.

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R=tomhudson@google.com

Review URL: https://codereview.chromium.org/22815012

git-svn-id: http://skia.googlecode.com/svn/trunk@10831 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
djsollen@google.com 2013-08-20 17:54:33 +00:00
parent 3055b70018
commit 9615fed005
1 changed files with 68 additions and 0 deletions
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68
gm/canvasstate.cpp
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@ -109,6 +109,74 @@ private:
//////////////////////////////////////////////////////////////////////////////
class CanvasLayerStateGM : public GM {
public:
CanvasLayerStateGM() {
fRedPaint.setColor(SK_ColorRED);
fRedPaint.setStyle(SkPaint::kFill_Style);
fBluePaint.setColor(SK_ColorBLUE);
fBluePaint.setStyle(SkPaint::kFill_Style);
fRect = SkRect::MakeXYWH(SPACER, SPACER, WIDTH-(2*SPACER), (HEIGHT-(2*SPACER)) / 7);
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("canvas-layer-state");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(WIDTH, HEIGHT);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
// clear the canvas to red
canvas->drawColor(SK_ColorRED);
// both rects should appear
drawTestPattern(canvas, 255, SkCanvas::kARGB_NoClipLayer_SaveFlag);
canvas->translate(0, 2*(fRect.height() + 10));
// only the top rect should appear
drawTestPattern(canvas, 255, SkCanvas::kARGB_ClipLayer_SaveFlag);
canvas->translate(0, 2*(fRect.height() + 10));
// only the bottom rect should appear
drawTestPattern(canvas, 0, SkCanvas::kARGB_NoClipLayer_SaveFlag);
}
virtual uint32_t onGetFlags() const SK_OVERRIDE { return kSkipGPU_Flag; }
private:
// draw a rect within the layer's bounds and again outside the layer's bounds
void drawTestPattern(SkCanvas* canvas, U8CPU layerAlpha, SkCanvas::SaveFlags flags) {
canvas->saveLayerAlpha(&fRect, layerAlpha, flags);
canvas->drawRect(fRect, fBluePaint);
canvas->translate(0, fRect.height() + 10);
canvas->drawRect(fRect, fBluePaint);
canvas->restore();
}
enum {
WIDTH = 400,
HEIGHT = 400,
SPACER = 10,
};
SkPaint fRedPaint;
SkPaint fBluePaint;
SkRect fRect;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return SkNEW(CanvasStateGM); )
DEF_GM( return SkNEW(CanvasLayerStateGM); )
} // end namespace