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 "sk_tool_utils.h" 10 #include "SkArithmeticImageFilter.h" 11 #include "SkImage.h" 12 #include "SkImageSource.h" 13 #include "SkOffsetImageFilter.h" 14 #include "SkXfermodeImageFilter.h" 15 16 #define WIDTH 600 17 #define HEIGHT 700 18 #define MARGIN 12 19 20 namespace skiagm { 21 22 class XfermodeImageFilterGM : public GM { 23 public: 24 XfermodeImageFilterGM(){ 25 this->setBGColor(0xFF000000); 26 } 27 28 protected: 29 SkString onShortName() override { 30 return SkString("xfermodeimagefilter"); 31 } 32 33 SkISize onISize() override { 34 return SkISize::Make(WIDTH, HEIGHT); 35 } 36 37 void onOnceBeforeDraw() override { 38 fBitmap = sk_tool_utils::create_string_bitmap(80, 80, 0xD000D000, 15, 65, 96, "e"); 39 40 fCheckerboard = SkImage::MakeFromBitmap( 41 sk_tool_utils::create_checkerboard_bitmap(80, 80, 42 sk_tool_utils::color_to_565(0xFFA0A0A0), 43 sk_tool_utils::color_to_565(0xFF404040), 44 8)); 45 } 46 47 void onDraw(SkCanvas* canvas) override { 48 canvas->clear(SK_ColorBLACK); 49 SkPaint paint; 50 51 const SkBlendMode gModes[] = { 52 SkBlendMode::kClear, 53 SkBlendMode::kSrc, 54 SkBlendMode::kDst, 55 SkBlendMode::kSrcOver, 56 SkBlendMode::kDstOver, 57 SkBlendMode::kSrcIn, 58 SkBlendMode::kDstIn, 59 SkBlendMode::kSrcOut, 60 SkBlendMode::kDstOut, 61 SkBlendMode::kSrcATop, 62 SkBlendMode::kDstATop, 63 SkBlendMode::kXor, 64 65 SkBlendMode::kPlus, 66 SkBlendMode::kModulate, 67 SkBlendMode::kScreen, 68 SkBlendMode::kOverlay, 69 SkBlendMode::kDarken, 70 SkBlendMode::kLighten, 71 SkBlendMode::kColorDodge, 72 SkBlendMode::kColorBurn, 73 SkBlendMode::kHardLight, 74 SkBlendMode::kSoftLight, 75 SkBlendMode::kDifference, 76 SkBlendMode::kExclusion, 77 SkBlendMode::kMultiply, 78 SkBlendMode::kHue, 79 SkBlendMode::kSaturation, 80 SkBlendMode::kColor, 81 SkBlendMode::kLuminosity, 82 }; 83 84 int x = 0, y = 0; 85 sk_sp<SkImageFilter> background(SkImageSource::Make(fCheckerboard)); 86 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 87 paint.setImageFilter(SkXfermodeImageFilter::Make(gModes[i], background)); 88 DrawClippedBitmap(canvas, fBitmap, paint, x, y); 89 x += fBitmap.width() + MARGIN; 90 if (x + fBitmap.width() > WIDTH) { 91 x = 0; 92 y += fBitmap.height() + MARGIN; 93 } 94 } 95 // Test arithmetic mode as image filter 96 paint.setImageFilter(SkArithmeticImageFilter::Make(0, 1, 1, 0, true, background, 97 nullptr, nullptr)); 98 DrawClippedBitmap(canvas, fBitmap, paint, x, y); 99 x += fBitmap.width() + MARGIN; 100 if (x + fBitmap.width() > WIDTH) { 101 x = 0; 102 y += fBitmap.height() + MARGIN; 103 } 104 // Test nullptr mode 105 paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver, background)); 106 DrawClippedBitmap(canvas, fBitmap, paint, x, y); 107 x += fBitmap.width() + MARGIN; 108 if (x + fBitmap.width() > WIDTH) { 109 x = 0; 110 y += fBitmap.height() + MARGIN; 111 } 112 SkRect clipRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() + 4), 113 SkIntToScalar(fBitmap.height() + 4)); 114 // Test offsets on SrcMode (uses fixed-function blend) 115 sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(fBitmap)); 116 sk_sp<SkImageFilter> foreground(SkImageSource::Make(std::move(bitmapImage))); 117 sk_sp<SkImageFilter> offsetForeground(SkOffsetImageFilter::Make(SkIntToScalar(4), 118 SkIntToScalar(-4), 119 foreground)); 120 sk_sp<SkImageFilter> offsetBackground(SkOffsetImageFilter::Make(SkIntToScalar(4), 121 SkIntToScalar(4), 122 background)); 123 paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver, 124 offsetBackground, 125 offsetForeground, 126 nullptr)); 127 DrawClippedPaint(canvas, clipRect, paint, x, y); 128 x += fBitmap.width() + MARGIN; 129 if (x + fBitmap.width() > WIDTH) { 130 x = 0; 131 y += fBitmap.height() + MARGIN; 132 } 133 // Test offsets on Darken (uses shader blend) 134 paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kDarken, 135 offsetBackground, 136 offsetForeground, 137 nullptr)); 138 DrawClippedPaint(canvas, clipRect, paint, x, y); 139 x += fBitmap.width() + MARGIN; 140 if (x + fBitmap.width() > WIDTH) { 141 x = 0; 142 y += fBitmap.height() + MARGIN; 143 } 144 // Test cropping 145 constexpr size_t nbSamples = 3; 146 const SkBlendMode sampledModes[nbSamples] = { 147 SkBlendMode::kOverlay, SkBlendMode::kSrcOver, SkBlendMode::kPlus 148 }; 149 int offsets[nbSamples][4] = {{ 10, 10, -16, -16}, 150 { 10, 10, 10, 10}, 151 {-10, -10, -6, -6}}; 152 for (size_t i = 0; i < nbSamples; ++i) { 153 SkIRect cropRect = SkIRect::MakeXYWH(offsets[i][0], 154 offsets[i][1], 155 fBitmap.width() + offsets[i][2], 156 fBitmap.height() + offsets[i][3]); 157 SkImageFilter::CropRect rect(SkRect::Make(cropRect)); 158 paint.setImageFilter(SkXfermodeImageFilter::Make(sampledModes[i], 159 offsetBackground, 160 offsetForeground, 161 &rect)); 162 DrawClippedPaint(canvas, clipRect, paint, x, y); 163 x += fBitmap.width() + MARGIN; 164 if (x + fBitmap.width() > WIDTH) { 165 x = 0; 166 y += fBitmap.height() + MARGIN; 167 } 168 } 169 // Test small bg, large fg with Screen (uses shader blend) 170 SkBlendMode mode = SkBlendMode::kScreen; 171 SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(10, 10, 60, 60)); 172 sk_sp<SkImageFilter> cropped(SkOffsetImageFilter::Make(0, 0, foreground, &cropRect)); 173 paint.setImageFilter(SkXfermodeImageFilter::Make(mode, cropped, background, nullptr)); 174 DrawClippedPaint(canvas, clipRect, paint, x, y); 175 x += fBitmap.width() + MARGIN; 176 if (x + fBitmap.width() > WIDTH) { 177 x = 0; 178 y += fBitmap.height() + MARGIN; 179 } 180 // Test small fg, large bg with Screen (uses shader blend) 181 paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background, cropped, nullptr)); 182 DrawClippedPaint(canvas, clipRect, paint, x, y); 183 x += fBitmap.width() + MARGIN; 184 if (x + fBitmap.width() > WIDTH) { 185 x = 0; 186 y += fBitmap.height() + MARGIN; 187 } 188 // Test small fg, large bg with SrcIn with a crop that forces it to full size. 189 // This tests that SkXfermodeImageFilter correctly applies the compositing mode to 190 // the region outside the foreground. 191 mode = SkBlendMode::kSrcIn; 192 SkImageFilter::CropRect cropRectFull(SkRect::MakeXYWH(0, 0, 80, 80)); 193 paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background, 194 cropped, &cropRectFull)); 195 DrawClippedPaint(canvas, clipRect, paint, x, y); 196 x += fBitmap.width() + MARGIN; 197 if (x + fBitmap.width() > WIDTH) { 198 x = 0; 199 y += fBitmap.height() + MARGIN; 200 } 201 } 202 203 private: 204 static void DrawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint, 205 int x, int y) { 206 canvas->save(); 207 canvas->translate(SkIntToScalar(x), SkIntToScalar(y)); 208 canvas->clipRect(SkRect::MakeIWH(bitmap.width(), bitmap.height())); 209 canvas->drawBitmap(bitmap, 0, 0, &paint); 210 canvas->restore(); 211 } 212 213 static void DrawClippedPaint(SkCanvas* canvas, const SkRect& rect, const SkPaint& paint, 214 int x, int y) { 215 canvas->save(); 216 canvas->translate(SkIntToScalar(x), SkIntToScalar(y)); 217 canvas->clipRect(rect); 218 canvas->drawPaint(paint); 219 canvas->restore(); 220 } 221 222 SkBitmap fBitmap; 223 sk_sp<SkImage> fCheckerboard; 224 225 typedef GM INHERITED; 226 }; 227 228 ////////////////////////////////////////////////////////////////////////////// 229 230 DEF_GM( return new XfermodeImageFilterGM; ); 231 232 } 233
