1 /* 2 * Copyright 2018 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/gm.h" 9 #include "include/core/SkBitmap.h" 10 #include "include/core/SkBlendMode.h" 11 #include "include/core/SkCanvas.h" 12 #include "include/core/SkColor.h" 13 #include "include/core/SkFont.h" 14 #include "include/core/SkImageInfo.h" 15 #include "include/core/SkPaint.h" 16 #include "include/core/SkRect.h" 17 #include "include/core/SkSize.h" 18 #include "include/core/SkString.h" 19 #include "include/core/SkTypeface.h" 20 #include "include/utils/SkTextUtils.h" 21 #include "tools/ToolUtils.h" 22 23 #include <initializer_list> 24 25 namespace skiagm { 26 27 // This GM recreates the blend mode images from the Android documentation 28 class AndroidBlendModesGM : public GM { 29 public: AndroidBlendModesGM()30 AndroidBlendModesGM() { 31 this->setBGColor(SK_ColorBLACK); 32 } 33 34 protected: onShortName()35 SkString onShortName() override { 36 return SkString("androidblendmodes"); 37 } 38 onISize()39 SkISize onISize() override { 40 return SkISize::Make(kNumCols * kBitmapSize, kNumRows * kBitmapSize); 41 } 42 onOnceBeforeDraw()43 void onOnceBeforeDraw() override { 44 SkImageInfo ii = SkImageInfo::MakeN32Premul(kBitmapSize, kBitmapSize); 45 { 46 fCompositeSrc.allocPixels(ii); 47 SkCanvas tmp(fCompositeSrc); 48 tmp.clear(SK_ColorTRANSPARENT); 49 SkPaint p; 50 p.setAntiAlias(true); 51 p.setColor(ToolUtils::color_to_565(kBlue)); 52 tmp.drawRect(SkRect::MakeLTRB(16, 96, 160, 240), p); 53 } 54 55 { 56 fCompositeDst.allocPixels(ii); 57 SkCanvas tmp(fCompositeDst); 58 tmp.clear(SK_ColorTRANSPARENT); 59 SkPaint p; 60 p.setAntiAlias(true); 61 p.setColor(ToolUtils::color_to_565(kRed)); 62 tmp.drawCircle(160, 95, 80, p); 63 } 64 } 65 drawTile(SkCanvas * canvas,int xOffset,int yOffset,SkBlendMode mode)66 void drawTile(SkCanvas* canvas, int xOffset, int yOffset, SkBlendMode mode) { 67 canvas->translate(xOffset, yOffset); 68 69 canvas->clipRect(SkRect::MakeXYWH(0, 0, 256, 256)); 70 71 canvas->saveLayer(nullptr, nullptr); 72 73 SkPaint p; 74 canvas->drawBitmap(fCompositeDst, 0, 0, &p); 75 p.setBlendMode(mode); 76 canvas->drawBitmap(fCompositeSrc, 0, 0, &p); 77 } 78 onDraw(SkCanvas * canvas)79 void onDraw(SkCanvas* canvas) override { 80 SkFont font(ToolUtils::create_portable_typeface()); 81 82 ToolUtils::draw_checkerboard(canvas, kWhite, kGrey, 32); 83 84 int xOffset = 0, yOffset = 0; 85 86 // Android doesn't expose all the blend modes 87 // Note that the Android documentation calls: 88 // Skia's kPlus, add 89 // Skia's kModulate, multiply 90 for (SkBlendMode mode : { SkBlendMode::kPlus /* add */, SkBlendMode::kClear, 91 SkBlendMode::kDarken, SkBlendMode::kDst, 92 SkBlendMode::kDstATop, SkBlendMode::kDstIn, 93 SkBlendMode::kDstOut, SkBlendMode::kDstOver, 94 SkBlendMode::kLighten, SkBlendMode::kModulate /* multiply */, 95 SkBlendMode::kOverlay, SkBlendMode::kScreen, 96 SkBlendMode::kSrc, SkBlendMode::kSrcATop, 97 SkBlendMode::kSrcIn, SkBlendMode::kSrcOut, 98 SkBlendMode::kSrcOver, SkBlendMode::kXor } ) { 99 100 int saveCount = canvas->save(); 101 this->drawTile(canvas, xOffset, yOffset, mode); 102 canvas->restoreToCount(saveCount); 103 104 SkTextUtils::DrawString(canvas, SkBlendMode_Name(mode), 105 xOffset + kBitmapSize/2.0f, 106 yOffset + kBitmapSize, 107 font, SkPaint(), SkTextUtils::kCenter_Align); 108 109 xOffset += 256; 110 if (xOffset >= 1024) { 111 xOffset = 0; 112 yOffset += 256; 113 } 114 } 115 } 116 117 private: 118 static const int kBitmapSize = 256; 119 static const int kNumRows = 5; 120 static const int kNumCols = 4; 121 122 static const SkColor kBlue = SkColorSetARGB(255, 22, 150, 243); 123 static const SkColor kRed = SkColorSetARGB(255, 233, 30, 99); 124 static const SkColor kWhite = SkColorSetARGB(255, 243, 243, 243); 125 static const SkColor kGrey = SkColorSetARGB(255, 222, 222, 222); 126 127 SkBitmap fCompositeSrc; 128 SkBitmap fCompositeDst; 129 130 typedef GM INHERITED; 131 }; 132 133 ////////////////////////////////////////////////////////////////////////////// 134 135 DEF_GM(return new AndroidBlendModesGM;) 136 } 137