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 DrawClippedBitmap(canvas, fBitmap, paint, x, y); 98 x += fBitmap.width() + MARGIN; 99 if (x + fBitmap.width() > WIDTH) { 100 x = 0; 101 y += fBitmap.height() + MARGIN; 102 } 103 // Test nullptr mode 104 paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver, background)); 105 DrawClippedBitmap(canvas, fBitmap, paint, x, y); 106 x += fBitmap.width() + MARGIN; 107 if (x + fBitmap.width() > WIDTH) { 108 x = 0; 109 y += fBitmap.height() + MARGIN; 110 } 111 SkRect clipRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() + 4), 112 SkIntToScalar(fBitmap.height() + 4)); 113 // Test offsets on SrcMode (uses fixed-function blend) 114 sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(fBitmap)); 115 sk_sp<SkImageFilter> foreground(SkImageSource::Make(std::move(bitmapImage))); 116 sk_sp<SkImageFilter> offsetForeground(SkOffsetImageFilter::Make(SkIntToScalar(4), 117 SkIntToScalar(-4), 118 foreground)); 119 sk_sp<SkImageFilter> offsetBackground(SkOffsetImageFilter::Make(SkIntToScalar(4), 120 SkIntToScalar(4), 121 background)); 122 paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver, 123 offsetBackground, 124 offsetForeground, 125 nullptr)); 126 DrawClippedPaint(canvas, clipRect, paint, x, y); 127 x += fBitmap.width() + MARGIN; 128 if (x + fBitmap.width() > WIDTH) { 129 x = 0; 130 y += fBitmap.height() + MARGIN; 131 } 132 // Test offsets on Darken (uses shader blend) 133 paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kDarken, 134 offsetBackground, 135 offsetForeground, 136 nullptr)); 137 DrawClippedPaint(canvas, clipRect, paint, x, y); 138 x += fBitmap.width() + MARGIN; 139 if (x + fBitmap.width() > WIDTH) { 140 x = 0; 141 y += fBitmap.height() + MARGIN; 142 } 143 // Test cropping 144 constexpr size_t nbSamples = 3; 145 const SkBlendMode sampledModes[nbSamples] = { 146 SkBlendMode::kOverlay, SkBlendMode::kSrcOver, SkBlendMode::kPlus 147 }; 148 int offsets[nbSamples][4] = {{ 10, 10, -16, -16}, 149 { 10, 10, 10, 10}, 150 {-10, -10, -6, -6}}; 151 for (size_t i = 0; i < nbSamples; ++i) { 152 SkIRect cropRect = SkIRect::MakeXYWH(offsets[i][0], 153 offsets[i][1], 154 fBitmap.width() + offsets[i][2], 155 fBitmap.height() + offsets[i][3]); 156 SkImageFilter::CropRect rect(SkRect::Make(cropRect)); 157 paint.setImageFilter(SkXfermodeImageFilter::Make(sampledModes[i], 158 offsetBackground, 159 offsetForeground, 160 &rect)); 161 DrawClippedPaint(canvas, clipRect, paint, x, y); 162 x += fBitmap.width() + MARGIN; 163 if (x + fBitmap.width() > WIDTH) { 164 x = 0; 165 y += fBitmap.height() + MARGIN; 166 } 167 } 168 // Test small bg, large fg with Screen (uses shader blend) 169 SkBlendMode mode = SkBlendMode::kScreen; 170 SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(10, 10, 60, 60)); 171 sk_sp<SkImageFilter> cropped(SkOffsetImageFilter::Make(0, 0, foreground, &cropRect)); 172 paint.setImageFilter(SkXfermodeImageFilter::Make(mode, cropped, background, nullptr)); 173 DrawClippedPaint(canvas, clipRect, paint, x, y); 174 x += fBitmap.width() + MARGIN; 175 if (x + fBitmap.width() > WIDTH) { 176 x = 0; 177 y += fBitmap.height() + MARGIN; 178 } 179 // Test small fg, large bg with Screen (uses shader blend) 180 paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background, cropped, nullptr)); 181 DrawClippedPaint(canvas, clipRect, paint, x, y); 182 x += fBitmap.width() + MARGIN; 183 if (x + fBitmap.width() > WIDTH) { 184 x = 0; 185 y += fBitmap.height() + MARGIN; 186 } 187 // Test small fg, large bg with SrcIn with a crop that forces it to full size. 188 // This tests that SkXfermodeImageFilter correctly applies the compositing mode to 189 // the region outside the foreground. 190 mode = SkBlendMode::kSrcIn; 191 SkImageFilter::CropRect cropRectFull(SkRect::MakeXYWH(0, 0, 80, 80)); 192 paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background, 193 cropped, &cropRectFull)); 194 DrawClippedPaint(canvas, clipRect, paint, x, y); 195 x += fBitmap.width() + MARGIN; 196 if (x + fBitmap.width() > WIDTH) { 197 x = 0; 198 y += fBitmap.height() + MARGIN; 199 } 200 } 201 202 private: 203 static void DrawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint, 204 int x, int y) { 205 canvas->save(); 206 canvas->translate(SkIntToScalar(x), SkIntToScalar(y)); 207 canvas->clipRect(SkRect::MakeWH( 208 SkIntToScalar(bitmap.width()), SkIntToScalar(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
