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change composeshader_alpha to exercise srcover as well

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BUG=skia:
R=scroggo@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/263083011

git-svn-id: http://skia.googlecode.com/svn/trunk@14572 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
commit-bot@chromium.org 2014-05-05 18:23:54 +00:00
parent 6b392b6111
commit 58e428729b
1 changed files with 47 additions and 35 deletions
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82
gm/composeshader.cpp
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@ -15,32 +15,33 @@
#include "SkString.h"
#include "SkXfermode.h"
static SkShader* make_shader(SkXfermode::Mode mode) {
SkPoint pts[2];
SkColor colors[2];
pts[0].set(0, 0);
pts[1].set(SkIntToScalar(100), 0);
colors[0] = SK_ColorRED;
colors[1] = SK_ColorBLUE;
SkAutoTUnref<SkShader> shaderA(SkGradientShader::CreateLinear(pts, colors, NULL, 2,
SkShader::kClamp_TileMode));
pts[0].set(0, 0);
pts[1].set(0, SkIntToScalar(100));
colors[0] = SK_ColorBLACK;
colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
SkAutoTUnref<SkShader> shaderB(SkGradientShader::CreateLinear(pts, colors, NULL, 2,
SkShader::kClamp_TileMode));
SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(mode));
return SkNEW_ARGS(SkComposeShader, (shaderA, shaderB, xfer));
}
class ComposeShaderGM : public skiagm::GM {
public:
ComposeShaderGM() {
SkPoint pts[2];
SkColor colors[2];
pts[0].set(0, 0);
pts[1].set(SkIntToScalar(100), 0);
colors[0] = SK_ColorRED;
colors[1] = SK_ColorBLUE;
SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2,
SkShader::kClamp_TileMode);
pts[0].set(0, 0);
pts[1].set(0, SkIntToScalar(100));
colors[0] = SK_ColorBLACK;
colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, NULL, 2,
SkShader::kClamp_TileMode);
SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
fShader = new SkComposeShader(shaderA, shaderB, mode);
shaderA->unref();
shaderB->unref();
mode->unref();
fShader = make_shader(SkXfermode::kDstIn_Mode);
}
virtual ~ComposeShaderGM() {
@ -77,7 +78,7 @@ private:
typedef GM INHERITED ;
};
class ComposeShaderAlphaGM : public ComposeShaderGM {
class ComposeShaderAlphaGM : public skiagm::GM {
public:
ComposeShaderAlphaGM() {}
@ -87,24 +88,35 @@ protected:
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(120, 1024);
return SkISize::Make(220, 750);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkAutoTUnref<SkShader> shader0(make_shader(SkXfermode::kDstIn_Mode));
SkAutoTUnref<SkShader> shader1(make_shader(SkXfermode::kSrcOver_Mode));
SkShader* shaders[] = { shader0.get(), shader1.get() };
SkPaint paint;
paint.setColor(SK_ColorGREEN);
const SkRect r = SkRect::MakeXYWH(5, 5, 100, 100);
for (int alpha = 0xFF; alpha > 0; alpha -= 0x20) {
paint.setAlpha(0xFF);
paint.setShader(NULL);
canvas->drawRect(r, paint);
paint.setAlpha(alpha);
paint.setShader(fShader);
canvas->drawRect(r, paint);
canvas->translate(r.width() + 5, 0);
for (size_t y = 0; y < SK_ARRAY_COUNT(shaders); ++y) {
SkShader* shader = shaders[y];
canvas->save();
for (int alpha = 0xFF; alpha > 0; alpha -= 0x28) {
paint.setAlpha(0xFF);
paint.setShader(NULL);
canvas->drawRect(r, paint);
paint.setAlpha(alpha);
paint.setShader(shader);
canvas->drawRect(r, paint);
canvas->translate(r.width() + 5, 0);
}
canvas->restore();
canvas->translate(0, r.height() + 5);
}
}
};