1 2/* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8#include "gm.h" 9#include "SkBitmap.h" 10#include "SkShader.h" 11#include "SkXfermode.h" 12 13namespace skiagm { 14 15static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst, 16 SkBitmap* transparent) { 17 src->allocN32Pixels(w, h); 18 src->eraseColor(SK_ColorTRANSPARENT); 19 20 SkPaint p; 21 p.setAntiAlias(true); 22 23 SkRect r; 24 SkScalar ww = SkIntToScalar(w); 25 SkScalar hh = SkIntToScalar(h); 26 27 { 28 SkCanvas c(*src); 29 p.setColor(0xFFFFCC44); 30 r.set(0, 0, ww*3/4, hh*3/4); 31 c.drawOval(r, p); 32 } 33 34 dst->allocN32Pixels(w, h); 35 dst->eraseColor(SK_ColorTRANSPARENT); 36 37 { 38 SkCanvas c(*dst); 39 p.setColor(0xFF66AAFF); 40 r.set(ww/3, hh/3, ww*19/20, hh*19/20); 41 c.drawRect(r, p); 42 } 43 44 transparent->allocN32Pixels(w, h); 45 transparent->eraseColor(SK_ColorTRANSPARENT); 46} 47 48static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; 49 50class XfermodesGM : public GM { 51 enum SrcType { 52 //! A WxH image with a rectangle in the lower right. 53 kRectangleImage_SrcType = 0x01, 54 //! kRectangleImage_SrcType with an alpha of 34.5%. 55 kRectangleImageWithAlpha_SrcType = 0x02, 56 //! kRectnagleImageWithAlpha_SrcType scaled down by half. 57 kSmallRectangleImageWithAlpha_SrcType = 0x04, 58 //! kRectangleImage_SrcType drawn directly instead in an image. 59 kRectangle_SrcType = 0x08, 60 //! Two rectangles, first on the right half, second on the bottom half. 61 kQuarterClear_SrcType = 0x10, 62 //! kQuarterClear_SrcType in a layer. 63 kQuarterClearInLayer_SrcType = 0x20, 64 //! A W/2xH/2 transparent image. 65 kSmallTransparentImage_SrcType = 0x40, 66 //! kRectangleImage_SrcType drawn directly with a mask. 67 kRectangleWithMask_SrcType = 0x80, 68 69 kAll_SrcType = 0xFF, //!< All the source types. 70 kBasic_SrcType = 0x03, //!< Just basic source types. 71 }; 72 73 SkBitmap fBG; 74 SkBitmap fSrcB, fDstB, fTransparent; 75 76 /* The srcType argument indicates what to draw for the source part. Skia 77 * uses the implied shape of the drawing command and these modes 78 * demonstrate that. 79 */ 80 void draw_mode(SkCanvas* canvas, SkXfermode* mode, SrcType srcType, 81 SkScalar x, SkScalar y) { 82 SkPaint p; 83 SkMatrix m; 84 bool restoreNeeded = false; 85 m.setTranslate(x, y); 86 87 canvas->drawBitmap(fSrcB, x, y, &p); 88 p.setXfermode(mode); 89 switch (srcType) { 90 case kSmallTransparentImage_SrcType: { 91 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 92 93 SkAutoCanvasRestore acr(canvas, true); 94 canvas->concat(m); 95 canvas->drawBitmap(fTransparent, 0, 0, &p); 96 break; 97 } 98 case kQuarterClearInLayer_SrcType: { 99 SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W), 100 SkIntToScalar(H)); 101 canvas->saveLayer(&bounds, &p); 102 restoreNeeded = true; 103 p.setXfermodeMode(SkXfermode::kSrcOver_Mode); 104 // Fall through. 105 } 106 case kQuarterClear_SrcType: { 107 SkScalar halfW = SkIntToScalar(W) / 2; 108 SkScalar halfH = SkIntToScalar(H) / 2; 109 p.setColor(0xFF66AAFF); 110 SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, 111 SkIntToScalar(H)); 112 canvas->drawRect(r, p); 113 p.setColor(0xFFAA66FF); 114 r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH); 115 canvas->drawRect(r, p); 116 break; 117 } 118 case kRectangleWithMask_SrcType: { 119 canvas->save(); 120 restoreNeeded = true; 121 SkScalar w = SkIntToScalar(W); 122 SkScalar h = SkIntToScalar(H); 123 SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60); 124 canvas->clipRect(r); 125 // Fall through. 126 } 127 case kRectangle_SrcType: { 128 SkScalar w = SkIntToScalar(W); 129 SkScalar h = SkIntToScalar(H); 130 SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3, 131 w * 37 / 60, h * 37 / 60); 132 p.setColor(0xFF66AAFF); 133 canvas->drawRect(r, p); 134 break; 135 } 136 case kSmallRectangleImageWithAlpha_SrcType: 137 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 138 // Fall through. 139 case kRectangleImageWithAlpha_SrcType: 140 p.setAlpha(0x88); 141 // Fall through. 142 case kRectangleImage_SrcType: { 143 SkAutoCanvasRestore acr(canvas, true); 144 canvas->concat(m); 145 canvas->drawBitmap(fDstB, 0, 0, &p); 146 break; 147 } 148 default: 149 break; 150 } 151 152 if (restoreNeeded) { 153 canvas->restore(); 154 } 155 } 156 157 void onOnceBeforeDraw() override { 158 fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, 159 kOpaque_SkAlphaType), 160 gData, 4); 161 162 make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent); 163 } 164 165public: 166 const static int W = 64; 167 const static int H = 64; 168 XfermodesGM() {} 169 170protected: 171 SkString onShortName() override { 172 return SkString("xfermodes"); 173 } 174 175 SkISize onISize() override { 176 return SkISize::Make(1990, 640); 177 } 178 179 void onDraw(SkCanvas* canvas) override { 180 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 181 182 const struct { 183 SkXfermode::Mode fMode; 184 const char* fLabel; 185 int fSourceTypeMask; // The source types to use this 186 // mode with. See draw_mode for 187 // an explanation of each type. 188 // PDF has to play some tricks 189 // to support the base modes, 190 // test those more extensively. 191 } gModes[] = { 192 { SkXfermode::kClear_Mode, "Clear", kAll_SrcType }, 193 { SkXfermode::kSrc_Mode, "Src", kAll_SrcType }, 194 { SkXfermode::kDst_Mode, "Dst", kAll_SrcType }, 195 { SkXfermode::kSrcOver_Mode, "SrcOver", kAll_SrcType }, 196 { SkXfermode::kDstOver_Mode, "DstOver", kAll_SrcType }, 197 { SkXfermode::kSrcIn_Mode, "SrcIn", kAll_SrcType }, 198 { SkXfermode::kDstIn_Mode, "DstIn", kAll_SrcType }, 199 { SkXfermode::kSrcOut_Mode, "SrcOut", kAll_SrcType }, 200 { SkXfermode::kDstOut_Mode, "DstOut", kAll_SrcType }, 201 { SkXfermode::kSrcATop_Mode, "SrcATop", kAll_SrcType }, 202 { SkXfermode::kDstATop_Mode, "DstATop", kAll_SrcType }, 203 204 { SkXfermode::kXor_Mode, "Xor", kBasic_SrcType }, 205 { SkXfermode::kPlus_Mode, "Plus", kBasic_SrcType }, 206 { SkXfermode::kModulate_Mode, "Modulate", kAll_SrcType }, 207 { SkXfermode::kScreen_Mode, "Screen", kBasic_SrcType }, 208 { SkXfermode::kOverlay_Mode, "Overlay", kBasic_SrcType }, 209 { SkXfermode::kDarken_Mode, "Darken", kBasic_SrcType }, 210 { SkXfermode::kLighten_Mode, "Lighten", kBasic_SrcType }, 211 { SkXfermode::kColorDodge_Mode, "ColorDodge", kBasic_SrcType }, 212 { SkXfermode::kColorBurn_Mode, "ColorBurn", kBasic_SrcType }, 213 { SkXfermode::kHardLight_Mode, "HardLight", kBasic_SrcType }, 214 { SkXfermode::kSoftLight_Mode, "SoftLight", kBasic_SrcType }, 215 { SkXfermode::kDifference_Mode, "Difference", kBasic_SrcType }, 216 { SkXfermode::kExclusion_Mode, "Exclusion", kBasic_SrcType }, 217 { SkXfermode::kMultiply_Mode, "Multiply", kAll_SrcType }, 218 { SkXfermode::kHue_Mode, "Hue", kBasic_SrcType }, 219 { SkXfermode::kSaturation_Mode, "Saturation", kBasic_SrcType }, 220 { SkXfermode::kColor_Mode, "Color", kBasic_SrcType }, 221 { SkXfermode::kLuminosity_Mode, "Luminosity", kBasic_SrcType }, 222 }; 223 224 const SkScalar w = SkIntToScalar(W); 225 const SkScalar h = SkIntToScalar(H); 226 SkMatrix m; 227 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 228 SkShader* s = SkShader::CreateBitmapShader(fBG, 229 SkShader::kRepeat_TileMode, 230 SkShader::kRepeat_TileMode, 231 &m); 232 233 SkPaint labelP; 234 labelP.setAntiAlias(true); 235 sk_tool_utils::set_portable_typeface(&labelP); 236 labelP.setTextAlign(SkPaint::kCenter_Align); 237 238 const int W = 5; 239 240 SkScalar x0 = 0; 241 SkScalar y0 = 0; 242 for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) { 243 SkScalar x = x0, y = y0; 244 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 245 if ((gModes[i].fSourceTypeMask & sourceType) == 0) { 246 continue; 247 } 248 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode); 249 SkAutoUnref aur(mode); 250 SkRect r; 251 r.set(x, y, x+w, y+h); 252 253 SkPaint p; 254 p.setStyle(SkPaint::kFill_Style); 255 p.setShader(s); 256 canvas->drawRect(r, p); 257 258 canvas->saveLayer(&r, NULL); 259 draw_mode(canvas, mode, static_cast<SrcType>(sourceType), 260 r.fLeft, r.fTop); 261 canvas->restore(); 262 263 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 264 p.setStyle(SkPaint::kStroke_Style); 265 p.setShader(NULL); 266 canvas->drawRect(r, p); 267 268#if 1 269 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel), 270 x + w/2, y - labelP.getTextSize()/2, labelP); 271#endif 272 x += w + SkIntToScalar(10); 273 if ((i % W) == W - 1) { 274 x = x0; 275 y += h + SkIntToScalar(30); 276 } 277 } 278 if (y < 320) { 279 if (x > x0) { 280 y += h + SkIntToScalar(30); 281 } 282 y0 = y; 283 } else { 284 x0 += SkIntToScalar(400); 285 y0 = 0; 286 } 287 } 288 s->unref(); 289 } 290 291private: 292 typedef GM INHERITED; 293}; 294 295////////////////////////////////////////////////////////////////////////////// 296 297static GM* MyFactory(void*) { return new XfermodesGM; } 298static GMRegistry reg(MyFactory); 299 300} 301