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 13 namespace skiagm { 14 15 static 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 48 static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; 49 50 class 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->drawBitmapMatrix(fSrcB, m, &p); 88 p.setXfermode(mode); 89 switch (srcType) { 90 case kSmallTransparentImage_SrcType: 91 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 92 canvas->drawBitmapMatrix(fTransparent, m, &p); 93 break; 94 case kQuarterClearInLayer_SrcType: { 95 SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W), 96 SkIntToScalar(H)); 97 canvas->saveLayer(&bounds, &p); 98 restoreNeeded = true; 99 p.setXfermodeMode(SkXfermode::kSrcOver_Mode); 100 // Fall through. 101 } 102 case kQuarterClear_SrcType: { 103 SkScalar halfW = SkIntToScalar(W) / 2; 104 SkScalar halfH = SkIntToScalar(H) / 2; 105 p.setColor(0xFF66AAFF); 106 SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, 107 SkIntToScalar(H)); 108 canvas->drawRect(r, p); 109 p.setColor(0xFFAA66FF); 110 r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH); 111 canvas->drawRect(r, p); 112 break; 113 } 114 case kRectangleWithMask_SrcType: { 115 canvas->save(); 116 restoreNeeded = true; 117 SkScalar w = SkIntToScalar(W); 118 SkScalar h = SkIntToScalar(H); 119 SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60); 120 canvas->clipRect(r); 121 // Fall through. 122 } 123 case kRectangle_SrcType: { 124 SkScalar w = SkIntToScalar(W); 125 SkScalar h = SkIntToScalar(H); 126 SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3, 127 w * 37 / 60, h * 37 / 60); 128 p.setColor(0xFF66AAFF); 129 canvas->drawRect(r, p); 130 break; 131 } 132 case kSmallRectangleImageWithAlpha_SrcType: 133 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 134 // Fall through. 135 case kRectangleImageWithAlpha_SrcType: 136 p.setAlpha(0x88); 137 // Fall through. 138 case kRectangleImage_SrcType: 139 canvas->drawBitmapMatrix(fDstB, m, &p); 140 break; 141 default: 142 break; 143 } 144 145 if (restoreNeeded) { 146 canvas->restore(); 147 } 148 } 149 150 virtual void onOnceBeforeDraw() SK_OVERRIDE { 151 fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, 152 kOpaque_SkAlphaType), 153 gData, 4); 154 155 make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent); 156 } 157 158 public: 159 const static int W = 64; 160 const static int H = 64; 161 XfermodesGM() {} 162 163 protected: 164 virtual SkString onShortName() { 165 return SkString("xfermodes"); 166 } 167 168 virtual SkISize onISize() { 169 return SkISize::Make(1990, 640); 170 } 171 172 virtual void onDraw(SkCanvas* canvas) { 173 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 174 175 const struct { 176 SkXfermode::Mode fMode; 177 const char* fLabel; 178 int fSourceTypeMask; // The source types to use this 179 // mode with. See draw_mode for 180 // an explanation of each type. 181 // PDF has to play some tricks 182 // to support the base modes, 183 // test those more extensively. 184 } gModes[] = { 185 { SkXfermode::kClear_Mode, "Clear", kAll_SrcType }, 186 { SkXfermode::kSrc_Mode, "Src", kAll_SrcType }, 187 { SkXfermode::kDst_Mode, "Dst", kAll_SrcType }, 188 { SkXfermode::kSrcOver_Mode, "SrcOver", kAll_SrcType }, 189 { SkXfermode::kDstOver_Mode, "DstOver", kAll_SrcType }, 190 { SkXfermode::kSrcIn_Mode, "SrcIn", kAll_SrcType }, 191 { SkXfermode::kDstIn_Mode, "DstIn", kAll_SrcType }, 192 { SkXfermode::kSrcOut_Mode, "SrcOut", kAll_SrcType }, 193 { SkXfermode::kDstOut_Mode, "DstOut", kAll_SrcType }, 194 { SkXfermode::kSrcATop_Mode, "SrcATop", kAll_SrcType }, 195 { SkXfermode::kDstATop_Mode, "DstATop", kAll_SrcType }, 196 197 { SkXfermode::kXor_Mode, "Xor", kBasic_SrcType }, 198 { SkXfermode::kPlus_Mode, "Plus", kBasic_SrcType }, 199 { SkXfermode::kModulate_Mode, "Modulate", kAll_SrcType }, 200 { SkXfermode::kScreen_Mode, "Screen", kBasic_SrcType }, 201 { SkXfermode::kOverlay_Mode, "Overlay", kBasic_SrcType }, 202 { SkXfermode::kDarken_Mode, "Darken", kBasic_SrcType }, 203 { SkXfermode::kLighten_Mode, "Lighten", kBasic_SrcType }, 204 { SkXfermode::kColorDodge_Mode, "ColorDodge", kBasic_SrcType }, 205 { SkXfermode::kColorBurn_Mode, "ColorBurn", kBasic_SrcType }, 206 { SkXfermode::kHardLight_Mode, "HardLight", kBasic_SrcType }, 207 { SkXfermode::kSoftLight_Mode, "SoftLight", kBasic_SrcType }, 208 { SkXfermode::kDifference_Mode, "Difference", kBasic_SrcType }, 209 { SkXfermode::kExclusion_Mode, "Exclusion", kBasic_SrcType }, 210 { SkXfermode::kMultiply_Mode, "Multiply", kAll_SrcType }, 211 { SkXfermode::kHue_Mode, "Hue", kBasic_SrcType }, 212 { SkXfermode::kSaturation_Mode, "Saturation", kBasic_SrcType }, 213 { SkXfermode::kColor_Mode, "Color", kBasic_SrcType }, 214 { SkXfermode::kLuminosity_Mode, "Luminosity", kBasic_SrcType }, 215 }; 216 217 const SkScalar w = SkIntToScalar(W); 218 const SkScalar h = SkIntToScalar(H); 219 SkMatrix m; 220 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 221 SkShader* s = SkShader::CreateBitmapShader(fBG, 222 SkShader::kRepeat_TileMode, 223 SkShader::kRepeat_TileMode, 224 &m); 225 226 SkPaint labelP; 227 labelP.setAntiAlias(true); 228 sk_tool_utils::set_portable_typeface(&labelP); 229 labelP.setTextAlign(SkPaint::kCenter_Align); 230 231 const int W = 5; 232 233 SkScalar x0 = 0; 234 SkScalar y0 = 0; 235 for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) { 236 SkScalar x = x0, y = y0; 237 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 238 if ((gModes[i].fSourceTypeMask & sourceType) == 0) { 239 continue; 240 } 241 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode); 242 SkAutoUnref aur(mode); 243 SkRect r; 244 r.set(x, y, x+w, y+h); 245 246 SkPaint p; 247 p.setStyle(SkPaint::kFill_Style); 248 p.setShader(s); 249 canvas->drawRect(r, p); 250 251 canvas->saveLayer(&r, NULL); 252 draw_mode(canvas, mode, static_cast<SrcType>(sourceType), 253 r.fLeft, r.fTop); 254 canvas->restore(); 255 256 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 257 p.setStyle(SkPaint::kStroke_Style); 258 p.setShader(NULL); 259 canvas->drawRect(r, p); 260 261 #if 1 262 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel), 263 x + w/2, y - labelP.getTextSize()/2, labelP); 264 #endif 265 x += w + SkIntToScalar(10); 266 if ((i % W) == W - 1) { 267 x = x0; 268 y += h + SkIntToScalar(30); 269 } 270 } 271 if (y < 320) { 272 if (x > x0) { 273 y += h + SkIntToScalar(30); 274 } 275 y0 = y; 276 } else { 277 x0 += SkIntToScalar(400); 278 y0 = 0; 279 } 280 } 281 s->unref(); 282 } 283 284 private: 285 typedef GM INHERITED; 286 }; 287 288 ////////////////////////////////////////////////////////////////////////////// 289 290 static GM* MyFactory(void*) { return new XfermodesGM; } 291 static GMRegistry reg(MyFactory); 292 293 } 294
