1 /* 2 * Copyright 2011 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 "SkPDFFormXObject.h" 9 #include "SkPDFGraphicState.h" 10 #include "SkPDFUtils.h" 11 #include "SkStream.h" 12 #include "SkTypes.h" 13 14 static const char* blend_mode_from_xfermode(SkXfermode::Mode mode) { 15 switch (mode) { 16 case SkXfermode::kSrcOver_Mode: return "Normal"; 17 case SkXfermode::kMultiply_Mode: return "Multiply"; 18 case SkXfermode::kScreen_Mode: return "Screen"; 19 case SkXfermode::kOverlay_Mode: return "Overlay"; 20 case SkXfermode::kDarken_Mode: return "Darken"; 21 case SkXfermode::kLighten_Mode: return "Lighten"; 22 case SkXfermode::kColorDodge_Mode: return "ColorDodge"; 23 case SkXfermode::kColorBurn_Mode: return "ColorBurn"; 24 case SkXfermode::kHardLight_Mode: return "HardLight"; 25 case SkXfermode::kSoftLight_Mode: return "SoftLight"; 26 case SkXfermode::kDifference_Mode: return "Difference"; 27 case SkXfermode::kExclusion_Mode: return "Exclusion"; 28 case SkXfermode::kHue_Mode: return "Hue"; 29 case SkXfermode::kSaturation_Mode: return "Saturation"; 30 case SkXfermode::kColor_Mode: return "Color"; 31 case SkXfermode::kLuminosity_Mode: return "Luminosity"; 32 33 // These are handled in SkPDFDevice::setUpContentEntry. 34 case SkXfermode::kClear_Mode: 35 case SkXfermode::kSrc_Mode: 36 case SkXfermode::kDst_Mode: 37 case SkXfermode::kDstOver_Mode: 38 case SkXfermode::kSrcIn_Mode: 39 case SkXfermode::kDstIn_Mode: 40 case SkXfermode::kSrcOut_Mode: 41 case SkXfermode::kDstOut_Mode: 42 case SkXfermode::kSrcATop_Mode: 43 case SkXfermode::kDstATop_Mode: 44 case SkXfermode::kModulate_Mode: 45 return "Normal"; 46 47 // TODO(vandebo): Figure out if we can support more of these modes. 48 case SkXfermode::kXor_Mode: 49 case SkXfermode::kPlus_Mode: 50 return NULL; 51 } 52 return NULL; 53 } 54 55 SkPDFGraphicState::~SkPDFGraphicState() { 56 SkAutoMutexAcquire lock(CanonicalPaintsMutex()); 57 if (!fSMask) { 58 int index = Find(fPaint); 59 SkASSERT(index >= 0); 60 SkASSERT(CanonicalPaints()[index].fGraphicState == this); 61 CanonicalPaints().removeShuffle(index); 62 } 63 fResources.unrefAll(); 64 } 65 66 void SkPDFGraphicState::getResources( 67 const SkTSet<SkPDFObject*>& knownResourceObjects, 68 SkTSet<SkPDFObject*>* newResourceObjects) { 69 GetResourcesHelper(&fResources, knownResourceObjects, newResourceObjects); 70 } 71 72 void SkPDFGraphicState::emitObject(SkWStream* stream, SkPDFCatalog* catalog, 73 bool indirect) { 74 populateDict(); 75 SkPDFDict::emitObject(stream, catalog, indirect); 76 } 77 78 // static 79 size_t SkPDFGraphicState::getOutputSize(SkPDFCatalog* catalog, bool indirect) { 80 populateDict(); 81 return SkPDFDict::getOutputSize(catalog, indirect); 82 } 83 84 // static 85 SkTDArray<SkPDFGraphicState::GSCanonicalEntry>& 86 SkPDFGraphicState::CanonicalPaints() { 87 // This initialization is only thread safe with gcc. 88 static SkTDArray<SkPDFGraphicState::GSCanonicalEntry> gCanonicalPaints; 89 return gCanonicalPaints; 90 } 91 92 // static 93 SkBaseMutex& SkPDFGraphicState::CanonicalPaintsMutex() { 94 // This initialization is only thread safe with gcc or when 95 // POD-style mutex initialization is used. 96 SK_DECLARE_STATIC_MUTEX(gCanonicalPaintsMutex); 97 return gCanonicalPaintsMutex; 98 } 99 100 // static 101 SkPDFGraphicState* SkPDFGraphicState::GetGraphicStateForPaint( 102 const SkPaint& paint) { 103 SkAutoMutexAcquire lock(CanonicalPaintsMutex()); 104 int index = Find(paint); 105 if (index >= 0) { 106 CanonicalPaints()[index].fGraphicState->ref(); 107 return CanonicalPaints()[index].fGraphicState; 108 } 109 GSCanonicalEntry newEntry(new SkPDFGraphicState(paint)); 110 CanonicalPaints().push(newEntry); 111 return newEntry.fGraphicState; 112 } 113 114 // static 115 SkPDFObject* SkPDFGraphicState::GetInvertFunction() { 116 // This assumes that canonicalPaintsMutex is held. 117 static SkPDFStream* invertFunction = NULL; 118 if (!invertFunction) { 119 // Acrobat crashes if we use a type 0 function, kpdf crashes if we use 120 // a type 2 function, so we use a type 4 function. 121 SkAutoTUnref<SkPDFArray> domainAndRange(new SkPDFArray); 122 domainAndRange->reserve(2); 123 domainAndRange->appendInt(0); 124 domainAndRange->appendInt(1); 125 126 static const char psInvert[] = "{1 exch sub}"; 127 SkAutoTUnref<SkMemoryStream> psInvertStream( 128 new SkMemoryStream(&psInvert, strlen(psInvert), true)); 129 130 invertFunction = new SkPDFStream(psInvertStream.get()); 131 invertFunction->insertInt("FunctionType", 4); 132 invertFunction->insert("Domain", domainAndRange.get()); 133 invertFunction->insert("Range", domainAndRange.get()); 134 } 135 return invertFunction; 136 } 137 138 // static 139 SkPDFGraphicState* SkPDFGraphicState::GetSMaskGraphicState( 140 SkPDFFormXObject* sMask, bool invert, SkPDFSMaskMode sMaskMode) { 141 // The practical chances of using the same mask more than once are unlikely 142 // enough that it's not worth canonicalizing. 143 SkAutoMutexAcquire lock(CanonicalPaintsMutex()); 144 145 SkAutoTUnref<SkPDFDict> sMaskDict(new SkPDFDict("Mask")); 146 if (sMaskMode == kAlpha_SMaskMode) { 147 sMaskDict->insertName("S", "Alpha"); 148 } else if (sMaskMode == kLuminosity_SMaskMode) { 149 sMaskDict->insertName("S", "Luminosity"); 150 } 151 sMaskDict->insert("G", new SkPDFObjRef(sMask))->unref(); 152 153 SkPDFGraphicState* result = new SkPDFGraphicState; 154 result->fPopulated = true; 155 result->fSMask = true; 156 result->insertName("Type", "ExtGState"); 157 result->insert("SMask", sMaskDict.get()); 158 result->fResources.push(sMask); 159 sMask->ref(); 160 161 if (invert) { 162 SkPDFObject* invertFunction = GetInvertFunction(); 163 result->fResources.push(invertFunction); 164 invertFunction->ref(); 165 sMaskDict->insert("TR", new SkPDFObjRef(invertFunction))->unref(); 166 } 167 168 return result; 169 } 170 171 // static 172 SkPDFGraphicState* SkPDFGraphicState::GetNoSMaskGraphicState() { 173 SkAutoMutexAcquire lock(CanonicalPaintsMutex()); 174 static SkPDFGraphicState* noSMaskGS = NULL; 175 if (!noSMaskGS) { 176 noSMaskGS = new SkPDFGraphicState; 177 noSMaskGS->fPopulated = true; 178 noSMaskGS->fSMask = true; 179 noSMaskGS->insertName("Type", "ExtGState"); 180 noSMaskGS->insertName("SMask", "None"); 181 } 182 noSMaskGS->ref(); 183 return noSMaskGS; 184 } 185 186 // static 187 int SkPDFGraphicState::Find(const SkPaint& paint) { 188 GSCanonicalEntry search(&paint); 189 return CanonicalPaints().find(search); 190 } 191 192 SkPDFGraphicState::SkPDFGraphicState() 193 : fPopulated(false), 194 fSMask(false) { 195 } 196 197 SkPDFGraphicState::SkPDFGraphicState(const SkPaint& paint) 198 : fPaint(paint), 199 fPopulated(false), 200 fSMask(false) { 201 } 202 203 // populateDict and operator== have to stay in sync with each other. 204 void SkPDFGraphicState::populateDict() { 205 if (!fPopulated) { 206 fPopulated = true; 207 insertName("Type", "ExtGState"); 208 209 SkAutoTUnref<SkPDFScalar> alpha( 210 new SkPDFScalar(SkScalarDiv(fPaint.getAlpha(), 0xFF))); 211 insert("CA", alpha.get()); 212 insert("ca", alpha.get()); 213 214 SK_COMPILE_ASSERT(SkPaint::kButt_Cap == 0, paint_cap_mismatch); 215 SK_COMPILE_ASSERT(SkPaint::kRound_Cap == 1, paint_cap_mismatch); 216 SK_COMPILE_ASSERT(SkPaint::kSquare_Cap == 2, paint_cap_mismatch); 217 SK_COMPILE_ASSERT(SkPaint::kCapCount == 3, paint_cap_mismatch); 218 SkASSERT(fPaint.getStrokeCap() >= 0 && fPaint.getStrokeCap() <= 2); 219 insertInt("LC", fPaint.getStrokeCap()); 220 221 SK_COMPILE_ASSERT(SkPaint::kMiter_Join == 0, paint_join_mismatch); 222 SK_COMPILE_ASSERT(SkPaint::kRound_Join == 1, paint_join_mismatch); 223 SK_COMPILE_ASSERT(SkPaint::kBevel_Join == 2, paint_join_mismatch); 224 SK_COMPILE_ASSERT(SkPaint::kJoinCount == 3, paint_join_mismatch); 225 SkASSERT(fPaint.getStrokeJoin() >= 0 && fPaint.getStrokeJoin() <= 2); 226 insertInt("LJ", fPaint.getStrokeJoin()); 227 228 insertScalar("LW", fPaint.getStrokeWidth()); 229 insertScalar("ML", fPaint.getStrokeMiter()); 230 insert("SA", new SkPDFBool(true))->unref(); // Auto stroke adjustment. 231 232 SkXfermode::Mode xfermode = SkXfermode::kSrcOver_Mode; 233 // If asMode fails, default to kSrcOver_Mode. 234 if (fPaint.getXfermode()) 235 fPaint.getXfermode()->asMode(&xfermode); 236 // If we don't support the mode, just use kSrcOver_Mode. 237 if (xfermode < 0 || xfermode > SkXfermode::kLastMode || 238 blend_mode_from_xfermode(xfermode) == NULL) { 239 xfermode = SkXfermode::kSrcOver_Mode; 240 NOT_IMPLEMENTED("unsupported xfermode", false); 241 } 242 insertName("BM", blend_mode_from_xfermode(xfermode)); 243 } 244 } 245 246 // We're only interested in some fields of the SkPaint, so we have a custom 247 // operator== function. 248 bool SkPDFGraphicState::GSCanonicalEntry::operator==( 249 const SkPDFGraphicState::GSCanonicalEntry& gs) const { 250 const SkPaint* a = fPaint; 251 const SkPaint* b = gs.fPaint; 252 SkASSERT(a != NULL); 253 SkASSERT(b != NULL); 254 255 if (SkColorGetA(a->getColor()) != SkColorGetA(b->getColor()) || 256 a->getStrokeCap() != b->getStrokeCap() || 257 a->getStrokeJoin() != b->getStrokeJoin() || 258 a->getStrokeWidth() != b->getStrokeWidth() || 259 a->getStrokeMiter() != b->getStrokeMiter()) { 260 return false; 261 } 262 263 SkXfermode::Mode aXfermodeName = SkXfermode::kSrcOver_Mode; 264 SkXfermode* aXfermode = a->getXfermode(); 265 if (aXfermode) { 266 aXfermode->asMode(&aXfermodeName); 267 } 268 if (aXfermodeName < 0 || aXfermodeName > SkXfermode::kLastMode || 269 blend_mode_from_xfermode(aXfermodeName) == NULL) { 270 aXfermodeName = SkXfermode::kSrcOver_Mode; 271 } 272 const char* aXfermodeString = blend_mode_from_xfermode(aXfermodeName); 273 SkASSERT(aXfermodeString != NULL); 274 275 SkXfermode::Mode bXfermodeName = SkXfermode::kSrcOver_Mode; 276 SkXfermode* bXfermode = b->getXfermode(); 277 if (bXfermode) { 278 bXfermode->asMode(&bXfermodeName); 279 } 280 if (bXfermodeName < 0 || bXfermodeName > SkXfermode::kLastMode || 281 blend_mode_from_xfermode(bXfermodeName) == NULL) { 282 bXfermodeName = SkXfermode::kSrcOver_Mode; 283 } 284 const char* bXfermodeString = blend_mode_from_xfermode(bXfermodeName); 285 SkASSERT(bXfermodeString != NULL); 286 287 return strcmp(aXfermodeString, bXfermodeString) == 0; 288 } 289
