385fe4d4b6
DOCS_PREVIEW= https://skia.org/?cl=1316123003 Review URL: https://codereview.chromium.org/1316123003
124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkCanvas.h"
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#include "SkComposeShader.h"
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#include "SkGradientShader.h"
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#include "SkGraphics.h"
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#include "SkShader.h"
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#include "SkString.h"
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#include "SkXfermode.h"
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static SkShader* make_shader(SkXfermode::Mode mode) {
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SkPoint pts[2];
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SkColor colors[2];
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pts[0].set(0, 0);
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pts[1].set(SkIntToScalar(100), 0);
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colors[0] = SK_ColorRED;
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colors[1] = SK_ColorBLUE;
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SkAutoTUnref<SkShader> shaderA(SkGradientShader::CreateLinear(pts, colors, NULL, 2,
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SkShader::kClamp_TileMode));
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pts[0].set(0, 0);
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pts[1].set(0, SkIntToScalar(100));
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colors[0] = SK_ColorBLACK;
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colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
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SkAutoTUnref<SkShader> shaderB(SkGradientShader::CreateLinear(pts, colors, NULL, 2,
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SkShader::kClamp_TileMode));
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SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(mode));
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return new SkComposeShader(shaderA, shaderB, xfer);
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}
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class ComposeShaderGM : public skiagm::GM {
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public:
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ComposeShaderGM() {
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fShader = make_shader(SkXfermode::kDstIn_Mode);
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}
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virtual ~ComposeShaderGM() {
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SkSafeUnref(fShader);
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}
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protected:
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SkString onShortName() override {
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return SkString("composeshader");
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}
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SkISize onISize() override {
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return SkISize::Make(120, 120);
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint;
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paint.setColor(SK_ColorGREEN);
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canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
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paint.setShader(fShader);
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canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
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}
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protected:
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SkShader* fShader;
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private:
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typedef GM INHERITED ;
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};
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class ComposeShaderAlphaGM : public skiagm::GM {
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public:
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ComposeShaderAlphaGM() {}
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protected:
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SkString onShortName() override {
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return SkString("composeshader_alpha");
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}
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SkISize onISize() override {
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return SkISize::Make(220, 750);
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}
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void onDraw(SkCanvas* canvas) override {
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SkAutoTUnref<SkShader> shader0(make_shader(SkXfermode::kDstIn_Mode));
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SkAutoTUnref<SkShader> shader1(make_shader(SkXfermode::kSrcOver_Mode));
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SkShader* shaders[] = { shader0.get(), shader1.get() };
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SkPaint paint;
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paint.setColor(SK_ColorGREEN);
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const SkRect r = SkRect::MakeXYWH(5, 5, 100, 100);
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for (size_t y = 0; y < SK_ARRAY_COUNT(shaders); ++y) {
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SkShader* shader = shaders[y];
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canvas->save();
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for (int alpha = 0xFF; alpha > 0; alpha -= 0x28) {
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paint.setAlpha(0xFF);
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paint.setShader(NULL);
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canvas->drawRect(r, paint);
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paint.setAlpha(alpha);
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paint.setShader(shader);
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canvas->drawRect(r, paint);
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canvas->translate(r.width() + 5, 0);
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}
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canvas->restore();
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canvas->translate(0, r.height() + 5);
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}
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}
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM( return new ComposeShaderGM; )
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DEF_GM( return new ComposeShaderAlphaGM; )
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