1/* 2 * Copyright 2013 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#include "gm.h" 9#include "SkBitmap.h" 10#include "SkCanvas.h" 11#include "SkColor.h" 12#include "SkShader.h" 13 14namespace skiagm { 15 16// This GM draws a 3x3 grid (with the center element excluded) of rectangles 17// filled with a bitmap shader. The bitmap shader is transformed so that the 18// pattern cell is at the center (excluded) region. 19// 20// In Repeat and Mirror mode, this tests that the bitmap shader still draws 21// even though the pattern cell is outside the clip. 22// 23// In Clamp mode, this tests that the clamp is handled properly. For PDF, 24// (and possibly other exported formats) this also "tests" that the image itself 25// is not stored (well, you'll need to open it up with an external tool to 26// verify that). 27 28static SkBitmap create_bitmap() { 29 SkBitmap bmp; 30 bmp.allocN32Pixels(2, 2); 31 uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels()); 32 pixels[0] = SkPreMultiplyColor(SK_ColorRED); 33 pixels[1] = SkPreMultiplyColor(SK_ColorGREEN); 34 pixels[2] = SkPreMultiplyColor(SK_ColorBLACK); 35 pixels[3] = SkPreMultiplyColor(SK_ColorBLUE); 36 37 return bmp; 38} 39 40static const SkScalar RECT_SIZE = 64; 41static const SkScalar SLIDE_SIZE = 300; 42 43class ClippedBitmapShadersGM : public GM { 44public: 45 ClippedBitmapShadersGM(SkShader::TileMode mode, bool hq=false) 46 : fMode(mode), fHQ(hq) { 47 } 48 49protected: 50 SkShader::TileMode fMode; 51 bool fHQ; 52 53 virtual SkString onShortName() { 54 SkString descriptor; 55 switch (fMode) { 56 case SkShader::kRepeat_TileMode: 57 descriptor = "tile"; 58 break; 59 case SkShader::kMirror_TileMode: 60 descriptor = "mirror"; 61 break; 62 case SkShader::kClamp_TileMode: 63 descriptor = "clamp"; 64 break; 65 default: 66 SkASSERT(false); 67 } 68 descriptor.prepend("clipped-bitmap-shaders-"); 69 if (fHQ) { 70 descriptor.append("-hq"); 71 } 72 return descriptor; 73 } 74 75 virtual SkISize onISize() { 76 return SkISize::Make(300, 300); 77 } 78 79 virtual void onDraw(SkCanvas* canvas) { 80 SkBitmap bmp = create_bitmap(); 81 SkMatrix s; 82 s.reset(); 83 s.setScale(8, 8); 84 s.postTranslate(SLIDE_SIZE / 2, SLIDE_SIZE / 2); 85 SkShader* shader = SkShader::CreateBitmapShader( 86 bmp, fMode, fMode, &s); 87 88 SkPaint paint; 89 paint.setShader(shader)->unref(); 90 91 if (fHQ) { 92 paint.setFilterLevel(SkPaint::kHigh_FilterLevel); 93 } 94 95 SkScalar margin = (SLIDE_SIZE / 3 - RECT_SIZE) / 2; 96 for (int i = 0; i < 3; i++) { 97 SkScalar yOrigin = SLIDE_SIZE / 3 * i + margin; 98 for (int j = 0; j < 3; j++) { 99 SkScalar xOrigin = SLIDE_SIZE / 3 * j + margin; 100 if (i == 1 && j == 1) { 101 continue; // skip center element 102 } 103 SkRect rect = SkRect::MakeXYWH(xOrigin, yOrigin, 104 RECT_SIZE, RECT_SIZE); 105 canvas->save(); 106 canvas->clipRect(rect); 107 canvas->drawRect(rect, paint); 108 canvas->restore(); 109 } 110 } 111 } 112 113private: 114 typedef GM INHERITED; 115}; 116 117////////////////////////////////////////////////////////////////////////////// 118 119DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode); ) 120DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode); ) 121DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode); ) 122 123DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode, true); ) 124DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode, true); ) 125DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode, true); ) 126 127 128} 129