xfermodes.cpp revision 7542dc8897d151afc0eca7dd73d72ea05f92baad
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->setConfig(SkBitmap::kARGB_8888_Config, w, h); 18 src->allocPixels(); 19 src->eraseColor(SK_ColorTRANSPARENT); 20 21 SkPaint p; 22 p.setAntiAlias(true); 23 24 SkRect r; 25 SkScalar ww = SkIntToScalar(w); 26 SkScalar hh = SkIntToScalar(h); 27 28 { 29 SkCanvas c(*src); 30 p.setColor(0xFFFFCC44); 31 r.set(0, 0, ww*3/4, hh*3/4); 32 c.drawOval(r, p); 33 } 34 35 dst->setConfig(SkBitmap::kARGB_8888_Config, w, h); 36 dst->allocPixels(); 37 dst->eraseColor(SK_ColorTRANSPARENT); 38 39 { 40 SkCanvas c(*dst); 41 p.setColor(0xFF66AAFF); 42 r.set(ww/3, hh/3, ww*19/20, hh*19/20); 43 c.drawRect(r, p); 44 } 45 46 transparent->setConfig(SkBitmap::kARGB_8888_Config, w, h); 47 transparent->allocPixels(); 48 transparent->eraseColor(SK_ColorTRANSPARENT); 49} 50 51static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; 52 53class XfermodesGM : public GM { 54 enum SrcType { 55 //! A WxH image with a rectangle in the lower right. 56 kRectangleImage_SrcType = 0x01, 57 //! kRectangleImage_SrcType with an alpha of 34.5%. 58 kRectangleImageWithAlpha_SrcType = 0x02, 59 //! kRectnagleImageWithAlpha_SrcType scaled down by half. 60 kSmallRectangleImageWithAlpha_SrcType = 0x04, 61 //! kRectangleImage_SrcType drawn directly instead in an image. 62 kRectangle_SrcType = 0x08, 63 //! Two rectangles, first on the right half, second on the bottom half. 64 kQuarterClear_SrcType = 0x10, 65 //! kQuarterClear_SrcType in a layer. 66 kQuarterClearInLayer_SrcType = 0x20, 67 //! A W/2xH/2 transparent image. 68 kSmallTransparentImage_SrcType = 0x40, 69 70 kAll_SrcType = 0x7F, //!< All the source types. 71 kBasic_SrcType = 0x03, //!< Just basic source types. 72 }; 73 74 SkBitmap fBG; 75 SkBitmap fSrcB, fDstB, fTransparent; 76 77 /* The srcType argument indicates what to draw for the source part. Skia 78 * uses the implied shape of the drawing command and these modes 79 * demonstrate that. 80 */ 81 void draw_mode(SkCanvas* canvas, SkXfermode* mode, SrcType srcType, 82 SkScalar x, SkScalar y) { 83 SkPaint p; 84 SkMatrix m; 85 bool restoreNeeded = false; 86 m.setTranslate(x, y); 87 88 canvas->drawBitmapMatrix(fSrcB, m, &p); 89 p.setXfermode(mode); 90 switch (srcType) { 91 case kSmallTransparentImage_SrcType: 92 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 93 canvas->drawBitmapMatrix(fTransparent, m, &p); 94 break; 95 case kQuarterClearInLayer_SrcType: { 96 SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W), 97 SkIntToScalar(H)); 98 canvas->saveLayer(&bounds, &p); 99 restoreNeeded = true; 100 p.setXfermodeMode(SkXfermode::kSrcOver_Mode); 101 // Fall through. 102 } 103 case kQuarterClear_SrcType: { 104 SkScalar halfW = SkIntToScalar(W) / 2; 105 SkScalar halfH = SkIntToScalar(H) / 2; 106 p.setColor(0xFF66AAFF); 107 SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, 108 SkIntToScalar(H)); 109 canvas->drawRect(r, p); 110 p.setColor(0xFFAA66FF); 111 r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH); 112 canvas->drawRect(r, p); 113 break; 114 } 115 case kRectangle_SrcType: { 116 SkScalar w = SkIntToScalar(W); 117 SkScalar h = SkIntToScalar(H); 118 SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3, 119 w * 37 / 60, h * 37 / 60); 120 p.setColor(0xFF66AAFF); 121 canvas->drawRect(r, p); 122 break; 123 } 124 case kSmallRectangleImageWithAlpha_SrcType: 125 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 126 // Fall through. 127 case kRectangleImageWithAlpha_SrcType: 128 p.setAlpha(0x88); 129 // Fall through. 130 case kRectangleImage_SrcType: 131 canvas->drawBitmapMatrix(fDstB, m, &p); 132 break; 133 default: 134 break; 135 } 136 137 if (restoreNeeded) { 138 canvas->restore(); 139 } 140 } 141 142 virtual void onOnceBeforeDraw() SK_OVERRIDE { 143 fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4, kOpaque_SkAlphaType); 144 fBG.setPixels(gData); 145 146 make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent); 147 } 148 149public: 150 const static int W = 64; 151 const static int H = 64; 152 XfermodesGM() {} 153 154protected: 155 virtual SkString onShortName() { 156 return SkString("xfermodes"); 157 } 158 159 virtual SkISize onISize() { 160 return make_isize(1990, 640); 161 } 162 163 virtual void onDraw(SkCanvas* canvas) { 164 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 165 166 const struct { 167 SkXfermode::Mode fMode; 168 const char* fLabel; 169 int fSourceTypeMask; // The source types to use this 170 // mode with. See draw_mode for 171 // an explanation of each type. 172 // PDF has to play some tricks 173 // to support the base modes, 174 // test those more extensively. 175 } gModes[] = { 176 { SkXfermode::kClear_Mode, "Clear", kAll_SrcType }, 177 { SkXfermode::kSrc_Mode, "Src", kAll_SrcType }, 178 { SkXfermode::kDst_Mode, "Dst", kAll_SrcType }, 179 { SkXfermode::kSrcOver_Mode, "SrcOver", kAll_SrcType }, 180 { SkXfermode::kDstOver_Mode, "DstOver", kAll_SrcType }, 181 { SkXfermode::kSrcIn_Mode, "SrcIn", kAll_SrcType }, 182 { SkXfermode::kDstIn_Mode, "DstIn", kAll_SrcType }, 183 { SkXfermode::kSrcOut_Mode, "SrcOut", kAll_SrcType }, 184 { SkXfermode::kDstOut_Mode, "DstOut", kAll_SrcType }, 185 { SkXfermode::kSrcATop_Mode, "SrcATop", kAll_SrcType }, 186 { SkXfermode::kDstATop_Mode, "DstATop", kAll_SrcType }, 187 188 { SkXfermode::kXor_Mode, "Xor", kBasic_SrcType }, 189 { SkXfermode::kPlus_Mode, "Plus", kBasic_SrcType }, 190 { SkXfermode::kModulate_Mode, "Modulate", kAll_SrcType }, 191 { SkXfermode::kScreen_Mode, "Screen", kBasic_SrcType }, 192 { SkXfermode::kOverlay_Mode, "Overlay", kBasic_SrcType }, 193 { SkXfermode::kDarken_Mode, "Darken", kBasic_SrcType }, 194 { SkXfermode::kLighten_Mode, "Lighten", kBasic_SrcType }, 195 { SkXfermode::kColorDodge_Mode, "ColorDodge", kBasic_SrcType }, 196 { SkXfermode::kColorBurn_Mode, "ColorBurn", kBasic_SrcType }, 197 { SkXfermode::kHardLight_Mode, "HardLight", kBasic_SrcType }, 198 { SkXfermode::kSoftLight_Mode, "SoftLight", kBasic_SrcType }, 199 { SkXfermode::kDifference_Mode, "Difference", kBasic_SrcType }, 200 { SkXfermode::kExclusion_Mode, "Exclusion", kBasic_SrcType }, 201 { SkXfermode::kMultiply_Mode, "Multiply", kAll_SrcType }, 202 { SkXfermode::kHue_Mode, "Hue", kBasic_SrcType }, 203 { SkXfermode::kSaturation_Mode, "Saturation", kBasic_SrcType }, 204 { SkXfermode::kColor_Mode, "Color", kBasic_SrcType }, 205 { SkXfermode::kLuminosity_Mode, "Luminosity", kBasic_SrcType }, 206 }; 207 208 const SkScalar w = SkIntToScalar(W); 209 const SkScalar h = SkIntToScalar(H); 210 SkShader* s = SkShader::CreateBitmapShader(fBG, 211 SkShader::kRepeat_TileMode, 212 SkShader::kRepeat_TileMode); 213 SkMatrix m; 214 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 215 s->setLocalMatrix(m); 216 217 SkPaint labelP; 218 labelP.setAntiAlias(true); 219 labelP.setTextAlign(SkPaint::kCenter_Align); 220 221 const int W = 5; 222 223 SkScalar x0 = 0; 224 SkScalar y0 = 0; 225 for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) { 226 SkScalar x = x0, y = y0; 227 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 228 if ((gModes[i].fSourceTypeMask & sourceType) == 0) { 229 continue; 230 } 231 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode); 232 SkAutoUnref aur(mode); 233 SkRect r; 234 r.set(x, y, x+w, y+h); 235 236 SkPaint p; 237 p.setStyle(SkPaint::kFill_Style); 238 p.setShader(s); 239 canvas->drawRect(r, p); 240 241 canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag); 242 draw_mode(canvas, mode, static_cast<SrcType>(sourceType), 243 r.fLeft, r.fTop); 244 canvas->restore(); 245 246 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 247 p.setStyle(SkPaint::kStroke_Style); 248 p.setShader(NULL); 249 canvas->drawRect(r, p); 250 251#if 1 252 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel), 253 x + w/2, y - labelP.getTextSize()/2, labelP); 254#endif 255 x += w + SkIntToScalar(10); 256 if ((i % W) == W - 1) { 257 x = x0; 258 y += h + SkIntToScalar(30); 259 } 260 } 261 if (y < 320) { 262 if (x > x0) { 263 y += h + SkIntToScalar(30); 264 } 265 y0 = y; 266 } else { 267 x0 += SkIntToScalar(400); 268 y0 = 0; 269 } 270 } 271 s->unref(); 272 } 273 274private: 275 typedef GM INHERITED; 276}; 277 278////////////////////////////////////////////////////////////////////////////// 279 280static GM* MyFactory(void*) { return new XfermodesGM; } 281static GMRegistry reg(MyFactory); 282 283} 284