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| 1 |
| 2 /* |
| 3 * Copyright 2013 Google Inc. |
| 4 * |
| 5 * Use of this source code is governed by a BSD-style license that can be |
| 6 * found in the LICENSE file. |
| 7 */ |
| 8 #include "gm.h" |
| 9 #include "SkBitmap.h" |
| 10 #include "SkRandom.h" |
| 11 #include "SkShader.h" |
| 12 #include "SkXfermode.h" |
| 13 |
| 14 namespace skiagm { |
| 15 |
| 16 /** |
| 17 * Renders overlapping circles with random SkXfermode::Modes against a checkerbo
ard. |
| 18 */ |
| 19 class MixedXfermodesGM : public GM { |
| 20 public: |
| 21 MixedXfermodesGM() { |
| 22 static uint32_t kCheckerPixelData[] = { 0xFFFFFFFF, 0xFFCCCCCC, 0xFFCCCC
CC, 0xFFFFFFFF }; |
| 23 SkBitmap bitmap; |
| 24 bitmap.setConfig(SkBitmap::kARGB_8888_Config, 2, 2, 2 * sizeof(uint32_t)
); |
| 25 bitmap.allocPixels(); |
| 26 bitmap.lockPixels(); |
| 27 memcpy(bitmap.getPixels(), kCheckerPixelData, sizeof(kCheckerPixelData))
; |
| 28 bitmap.unlockPixels(); |
| 29 fBG.reset(SkShader::CreateBitmapShader(bitmap, |
| 30 SkShader::kRepeat_TileMode, |
| 31 SkShader::kRepeat_TileMode)); |
| 32 SkASSERT(NULL != fBG); |
| 33 SkMatrix lm; |
| 34 lm.setScale(SkIntToScalar(20), SkIntToScalar(20)); |
| 35 fBG->setLocalMatrix(lm); |
| 36 } |
| 37 |
| 38 protected: |
| 39 virtual SkString onShortName() { |
| 40 return SkString("mixed_xfermodes"); |
| 41 } |
| 42 |
| 43 virtual SkISize onISize() { |
| 44 return make_isize(790, 640); |
| 45 } |
| 46 |
| 47 virtual void onDraw(SkCanvas* canvas) { |
| 48 // FIXME: Currently necessary for GPU to be able to make dst-copy in Sam
pleApp because |
| 49 // main layer is not a texture. |
| 50 SkPaint layerPaint; |
| 51 layerPaint.setXfermodeMode(SkXfermode::kSrc_Mode); |
| 52 canvas->saveLayer(NULL, &layerPaint); |
| 53 |
| 54 SkPaint bgPaint; |
| 55 bgPaint.setShader(fBG.get()); |
| 56 canvas->drawPaint(bgPaint); |
| 57 SkISize size = canvas->getDeviceSize(); |
| 58 SkScalar areaSqrt = SkScalarSqrt((SkIntToScalar(size.fWidth * size.fHeig
ht))); |
| 59 SkScalar minR = areaSqrt / 10; |
| 60 SkScalar maxR = areaSqrt / 4; |
| 61 SkMWCRandom random; |
| 62 for (int i = 0; i < kNumCircles; ++i) { |
| 63 SkScalar cx = random.nextRangeScalar(0, SkIntToScalar(size.fWidth)); |
| 64 SkScalar cy = random.nextRangeScalar(0, SkIntToScalar(size.fHeight))
; |
| 65 SkScalar r = random.nextRangeScalar(minR, maxR); |
| 66 SkColor color = random.nextU(); |
| 67 |
| 68 SkXfermode::Mode mode = |
| 69 static_cast<SkXfermode::Mode>(random.nextULessThan(SkXfermode::k
LastMode + 1)); |
| 70 // FIXME: Currently testing kDarken on GPU. |
| 71 mode = SkXfermode::kDarken_Mode; |
| 72 |
| 73 SkPaint p; |
| 74 p.setAntiAlias(true); |
| 75 p.setColor(color); |
| 76 p.setXfermodeMode(mode); |
| 77 canvas->drawCircle(cx, cy, r, p); |
| 78 } |
| 79 |
| 80 // FIXME: Remove text draw once this GM is finished. |
| 81 SkPaint txtPaint; |
| 82 txtPaint.setTextSize(areaSqrt / 20); |
| 83 txtPaint.setAntiAlias(true); |
| 84 static const char kTxt[] = "Work in progres... Do not baseline."; |
| 85 canvas->drawText(kTxt, strlen(kTxt), |
| 86 areaSqrt/50, |
| 87 SkIntToScalar(size.fHeight / 2), |
| 88 txtPaint); |
| 89 |
| 90 canvas->restore(); |
| 91 } |
| 92 |
| 93 // https://code.google.com/p/skia/issues/detail?id=1199&thanks=1199&ts=13648
39297 |
| 94 virtual uint32_t onGetFlags() const SK_OVERRIDE { return kSkipPipe_Flag; } |
| 95 |
| 96 private: |
| 97 enum { |
| 98 kMinR = 10, |
| 99 kMaxR = 50, |
| 100 kNumCircles = 50, |
| 101 }; |
| 102 SkAutoTUnref<SkShader> fBG; |
| 103 typedef GM INHERITED; |
| 104 }; |
| 105 |
| 106 ////////////////////////////////////////////////////////////////////////////// |
| 107 |
| 108 static GM* MyFactory(void*) { return new MixedXfermodesGM; } |
| 109 static GMRegistry reg(MyFactory); |
| 110 |
| 111 } |
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