05a2ee052c
git-svn-id: http://skia.googlecode.com/svn/trunk@8477 2bbb7eff-a529-9590-31e7-b0007b416f81
112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
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/*
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* Copyright 2013 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 "SkBitmap.h"
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#include "SkRandom.h"
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#include "SkShader.h"
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#include "SkXfermode.h"
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namespace skiagm {
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/**
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* Renders overlapping circles with random SkXfermode::Modes against a checkerboard.
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*/
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class MixedXfermodesGM : public GM {
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public:
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MixedXfermodesGM() {
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static uint32_t kCheckerPixelData[] = { 0xFFFFFFFF, 0xFFCCCCCC, 0xFFCCCCCC, 0xFFFFFFFF };
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SkBitmap bitmap;
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bitmap.setConfig(SkBitmap::kARGB_8888_Config, 2, 2, 2 * sizeof(uint32_t));
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bitmap.allocPixels();
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bitmap.lockPixels();
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memcpy(bitmap.getPixels(), kCheckerPixelData, sizeof(kCheckerPixelData));
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bitmap.unlockPixels();
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fBG.reset(SkShader::CreateBitmapShader(bitmap,
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SkShader::kRepeat_TileMode,
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SkShader::kRepeat_TileMode));
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SkASSERT(NULL != fBG);
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SkMatrix lm;
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lm.setScale(SkIntToScalar(20), SkIntToScalar(20));
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fBG->setLocalMatrix(lm);
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}
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protected:
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virtual SkString onShortName() {
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return SkString("mixed_xfermodes");
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}
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virtual SkISize onISize() {
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return make_isize(790, 640);
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}
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virtual void onDraw(SkCanvas* canvas) {
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// FIXME: Currently necessary for GPU to be able to make dst-copy in SampleApp because
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// main layer is not a texture.
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SkPaint layerPaint;
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layerPaint.setXfermodeMode(SkXfermode::kSrc_Mode);
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canvas->saveLayer(NULL, &layerPaint);
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SkPaint bgPaint;
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bgPaint.setShader(fBG.get());
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canvas->drawPaint(bgPaint);
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SkISize size = canvas->getDeviceSize();
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SkScalar areaSqrt = SkScalarSqrt((SkIntToScalar(size.fWidth * size.fHeight)));
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SkScalar minR = areaSqrt / 10;
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SkScalar maxR = areaSqrt / 4;
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SkMWCRandom random;
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for (int i = 0; i < kNumCircles; ++i) {
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SkScalar cx = random.nextRangeScalar(0, SkIntToScalar(size.fWidth));
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SkScalar cy = random.nextRangeScalar(0, SkIntToScalar(size.fHeight));
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SkScalar r = random.nextRangeScalar(minR, maxR);
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SkColor color = random.nextU();
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SkXfermode::Mode mode =
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static_cast<SkXfermode::Mode>(random.nextULessThan(SkXfermode::kLastMode + 1));
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// FIXME: Currently testing kDarken on GPU.
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mode = SkXfermode::kDarken_Mode;
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SkPaint p;
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p.setAntiAlias(true);
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p.setColor(color);
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p.setXfermodeMode(mode);
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canvas->drawCircle(cx, cy, r, p);
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}
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// FIXME: Remove text draw once this GM is finished.
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SkPaint txtPaint;
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txtPaint.setTextSize(areaSqrt / 20);
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txtPaint.setAntiAlias(true);
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static const char kTxt[] = "Work in progres... Do not baseline.";
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canvas->drawText(kTxt, strlen(kTxt),
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areaSqrt/50,
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SkIntToScalar(size.fHeight / 2),
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txtPaint);
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canvas->restore();
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}
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// https://code.google.com/p/skia/issues/detail?id=1199&thanks=1199&ts=1364839297
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virtual uint32_t onGetFlags() const SK_OVERRIDE { return kSkipPipe_Flag; }
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private:
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enum {
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kMinR = 10,
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kMaxR = 50,
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kNumCircles = 50,
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};
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SkAutoTUnref<SkShader> fBG;
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typedef GM INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static GM* MyFactory(void*) { return new MixedXfermodesGM; }
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static GMRegistry reg(MyFactory);
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}
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