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