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| 1 /* |
| 2 * Copyright 2014 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #if SK_SUPPORT_GPU |
| 9 |
| 10 #include "gm.h" |
| 11 #include "SkCanvas.h" |
| 12 #include "SkColorShader.h" |
| 13 #include "SkPaint.h" |
| 14 #include "SkSurface.h" |
| 15 |
| 16 namespace skiagm { |
| 17 |
| 18 /* |
| 19 * This GM exercises SkCanvas::discard() by creating an offscreen SkSurface and
repeatedly |
| 20 * discarding it, drawing to it, and then drawing it to the main canvas. |
| 21 */ |
| 22 class DiscardGM : public GM { |
| 23 |
| 24 public: |
| 25 DiscardGM() { |
| 26 } |
| 27 |
| 28 virtual uint32_t onGetFlags() const SK_OVERRIDE { return kGPUOnly_Flag; } |
| 29 |
| 30 protected: |
| 31 virtual SkString onShortName() SK_OVERRIDE { |
| 32 return SkString("discard"); |
| 33 } |
| 34 |
| 35 virtual SkISize onISize() SK_OVERRIDE { |
| 36 return SkISize::Make(100, 100); |
| 37 } |
| 38 |
| 39 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| 40 GrContext* context = canvas->getGrContext(); |
| 41 if (NULL == context) { |
| 42 return; |
| 43 } |
| 44 |
| 45 SkISize size = this->getISize(); |
| 46 size.fWidth /= 10; |
| 47 size.fHeight /= 10; |
| 48 SkImageInfo info = SkImageInfo::MakeN32Premul(size); |
| 49 SkSurface* surface = SkSurface::NewRenderTarget(context, info); |
| 50 |
| 51 if (NULL == surface) { |
| 52 return; |
| 53 } |
| 54 |
| 55 canvas->clear(SK_ColorBLACK); |
| 56 |
| 57 SkRandom rand; |
| 58 for (int x = 0; x < 10; ++x) { |
| 59 for (int y = 0; y < 10; ++y) { |
| 60 surface->getCanvas()->discard(); |
| 61 // Make something that isn't too close to the background color, bl
ack. |
| 62 SkColor color = rand.nextU() | 0xFF404040; |
| 63 switch (rand.nextULessThan(3)) { |
| 64 case 0: |
| 65 surface->getCanvas()->drawColor(color); |
| 66 break; |
| 67 case 1: |
| 68 surface->getCanvas()->clear(color); |
| 69 break; |
| 70 case 2: |
| 71 SkColorShader shader(color); |
| 72 SkPaint paint; |
| 73 paint.setShader(&shader); |
| 74 surface->getCanvas()->drawPaint(paint); |
| 75 break; |
| 76 } |
| 77 surface->draw(canvas, 10*x, 10*y, NULL); |
| 78 } |
| 79 } |
| 80 |
| 81 surface->getCanvas()->discard(); |
| 82 surface->unref(); |
| 83 } |
| 84 |
| 85 private: |
| 86 typedef GM INHERITED; |
| 87 }; |
| 88 |
| 89 ////////////////////////////////////////////////////////////////////////////// |
| 90 |
| 91 DEF_GM( return SkNEW(DiscardGM); ) |
| 92 |
| 93 } // end namespace |
| 94 |
| 95 #endif |
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