The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/core/SkReadBuffer.cpp
gfx/skia/trunk/src/core/SkReadBuffer.cpp
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- TOR_BUG_3246
- changeset 6
- 8bccb770b82d
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| -1:000000000000 | 0:9f1eae38ee46 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2012 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 #include "SkBitmap.h" | |
| 10 #include "SkErrorInternals.h" | |
| 11 #include "SkReadBuffer.h" | |
| 12 #include "SkStream.h" | |
| 13 #include "SkTypeface.h" | |
| 14 | |
| 15 static uint32_t default_flags() { | |
| 16 uint32_t flags = 0; | |
| 17 #ifdef SK_SCALAR_IS_FLOAT | |
| 18 flags |= SkReadBuffer::kScalarIsFloat_Flag; | |
| 19 #endif | |
| 20 if (8 == sizeof(void*)) { | |
| 21 flags |= SkReadBuffer::kPtrIs64Bit_Flag; | |
| 22 } | |
| 23 return flags; | |
| 24 } | |
| 25 | |
| 26 SkReadBuffer::SkReadBuffer() { | |
| 27 fFlags = default_flags(); | |
| 28 fMemoryPtr = NULL; | |
| 29 | |
| 30 fBitmapStorage = NULL; | |
| 31 fTFArray = NULL; | |
| 32 fTFCount = 0; | |
| 33 | |
| 34 fFactoryTDArray = NULL; | |
| 35 fFactoryArray = NULL; | |
| 36 fFactoryCount = 0; | |
| 37 fBitmapDecoder = NULL; | |
| 38 #ifdef DEBUG_NON_DETERMINISTIC_ASSERT | |
| 39 fDecodedBitmapIndex = -1; | |
| 40 #endif // DEBUG_NON_DETERMINISTIC_ASSERT | |
| 41 } | |
| 42 | |
| 43 SkReadBuffer::SkReadBuffer(const void* data, size_t size) { | |
| 44 fFlags = default_flags(); | |
| 45 fReader.setMemory(data, size); | |
| 46 fMemoryPtr = NULL; | |
| 47 | |
| 48 fBitmapStorage = NULL; | |
| 49 fTFArray = NULL; | |
| 50 fTFCount = 0; | |
| 51 | |
| 52 fFactoryTDArray = NULL; | |
| 53 fFactoryArray = NULL; | |
| 54 fFactoryCount = 0; | |
| 55 fBitmapDecoder = NULL; | |
| 56 #ifdef DEBUG_NON_DETERMINISTIC_ASSERT | |
| 57 fDecodedBitmapIndex = -1; | |
| 58 #endif // DEBUG_NON_DETERMINISTIC_ASSERT | |
| 59 } | |
| 60 | |
| 61 SkReadBuffer::SkReadBuffer(SkStream* stream) { | |
| 62 fFlags = default_flags(); | |
| 63 const size_t length = stream->getLength(); | |
| 64 fMemoryPtr = sk_malloc_throw(length); | |
| 65 stream->read(fMemoryPtr, length); | |
| 66 fReader.setMemory(fMemoryPtr, length); | |
| 67 | |
| 68 fBitmapStorage = NULL; | |
| 69 fTFArray = NULL; | |
| 70 fTFCount = 0; | |
| 71 | |
| 72 fFactoryTDArray = NULL; | |
| 73 fFactoryArray = NULL; | |
| 74 fFactoryCount = 0; | |
| 75 fBitmapDecoder = NULL; | |
| 76 #ifdef DEBUG_NON_DETERMINISTIC_ASSERT | |
| 77 fDecodedBitmapIndex = -1; | |
| 78 #endif // DEBUG_NON_DETERMINISTIC_ASSERT | |
| 79 } | |
| 80 | |
| 81 SkReadBuffer::~SkReadBuffer() { | |
| 82 sk_free(fMemoryPtr); | |
| 83 SkSafeUnref(fBitmapStorage); | |
| 84 } | |
| 85 | |
| 86 bool SkReadBuffer::readBool() { | |
| 87 return fReader.readBool(); | |
| 88 } | |
| 89 | |
| 90 SkColor SkReadBuffer::readColor() { | |
| 91 return fReader.readInt(); | |
| 92 } | |
| 93 | |
| 94 SkFixed SkReadBuffer::readFixed() { | |
| 95 return fReader.readS32(); | |
| 96 } | |
| 97 | |
| 98 int32_t SkReadBuffer::readInt() { | |
| 99 return fReader.readInt(); | |
| 100 } | |
| 101 | |
| 102 SkScalar SkReadBuffer::readScalar() { | |
| 103 return fReader.readScalar(); | |
| 104 } | |
| 105 | |
| 106 uint32_t SkReadBuffer::readUInt() { | |
| 107 return fReader.readU32(); | |
| 108 } | |
| 109 | |
| 110 int32_t SkReadBuffer::read32() { | |
| 111 return fReader.readInt(); | |
| 112 } | |
| 113 | |
| 114 void SkReadBuffer::readString(SkString* string) { | |
| 115 size_t len; | |
| 116 const char* strContents = fReader.readString(&len); | |
| 117 string->set(strContents, len); | |
| 118 } | |
| 119 | |
| 120 void* SkReadBuffer::readEncodedString(size_t* length, SkPaint::TextEncoding encoding) { | |
| 121 SkDEBUGCODE(int32_t encodingType = ) fReader.readInt(); | |
| 122 SkASSERT(encodingType == encoding); | |
| 123 *length = fReader.readInt(); | |
| 124 void* data = sk_malloc_throw(*length); | |
| 125 memcpy(data, fReader.skip(SkAlign4(*length)), *length); | |
| 126 return data; | |
| 127 } | |
| 128 | |
| 129 void SkReadBuffer::readPoint(SkPoint* point) { | |
| 130 point->fX = fReader.readScalar(); | |
| 131 point->fY = fReader.readScalar(); | |
| 132 } | |
| 133 | |
| 134 void SkReadBuffer::readMatrix(SkMatrix* matrix) { | |
| 135 fReader.readMatrix(matrix); | |
| 136 } | |
| 137 | |
| 138 void SkReadBuffer::readIRect(SkIRect* rect) { | |
| 139 memcpy(rect, fReader.skip(sizeof(SkIRect)), sizeof(SkIRect)); | |
| 140 } | |
| 141 | |
| 142 void SkReadBuffer::readRect(SkRect* rect) { | |
| 143 memcpy(rect, fReader.skip(sizeof(SkRect)), sizeof(SkRect)); | |
| 144 } | |
| 145 | |
| 146 void SkReadBuffer::readRegion(SkRegion* region) { | |
| 147 fReader.readRegion(region); | |
| 148 } | |
| 149 | |
| 150 void SkReadBuffer::readPath(SkPath* path) { | |
| 151 fReader.readPath(path); | |
| 152 } | |
| 153 | |
| 154 bool SkReadBuffer::readArray(void* value, size_t size, size_t elementSize) { | |
| 155 const size_t count = this->getArrayCount(); | |
| 156 if (count == size) { | |
| 157 (void)fReader.skip(sizeof(uint32_t)); // Skip array count | |
| 158 const size_t byteLength = count * elementSize; | |
| 159 memcpy(value, fReader.skip(SkAlign4(byteLength)), byteLength); | |
| 160 return true; | |
| 161 } | |
| 162 SkASSERT(false); | |
| 163 fReader.skip(fReader.available()); | |
| 164 return false; | |
| 165 } | |
| 166 | |
| 167 bool SkReadBuffer::readByteArray(void* value, size_t size) { | |
| 168 return readArray(static_cast<unsigned char*>(value), size, sizeof(unsigned char)); | |
| 169 } | |
| 170 | |
| 171 bool SkReadBuffer::readColorArray(SkColor* colors, size_t size) { | |
| 172 return readArray(colors, size, sizeof(SkColor)); | |
| 173 } | |
| 174 | |
| 175 bool SkReadBuffer::readIntArray(int32_t* values, size_t size) { | |
| 176 return readArray(values, size, sizeof(int32_t)); | |
| 177 } | |
| 178 | |
| 179 bool SkReadBuffer::readPointArray(SkPoint* points, size_t size) { | |
| 180 return readArray(points, size, sizeof(SkPoint)); | |
| 181 } | |
| 182 | |
| 183 bool SkReadBuffer::readScalarArray(SkScalar* values, size_t size) { | |
| 184 return readArray(values, size, sizeof(SkScalar)); | |
| 185 } | |
| 186 | |
| 187 uint32_t SkReadBuffer::getArrayCount() { | |
| 188 return *(uint32_t*)fReader.peek(); | |
| 189 } | |
| 190 | |
| 191 void SkReadBuffer::readBitmap(SkBitmap* bitmap) { | |
| 192 const int width = this->readInt(); | |
| 193 const int height = this->readInt(); | |
| 194 // The writer stored a boolean value to determine whether an SkBitmapHeap was used during | |
| 195 // writing. | |
| 196 if (this->readBool()) { | |
| 197 // An SkBitmapHeap was used for writing. Read the index from the stream and find the | |
| 198 // corresponding SkBitmap in fBitmapStorage. | |
| 199 const uint32_t index = fReader.readU32(); | |
| 200 fReader.readU32(); // bitmap generation ID (see SkWriteBuffer::writeBitmap) | |
| 201 if (fBitmapStorage) { | |
| 202 *bitmap = *fBitmapStorage->getBitmap(index); | |
| 203 fBitmapStorage->releaseRef(index); | |
| 204 return; | |
| 205 } else { | |
| 206 // The bitmap was stored in a heap, but there is no way to access it. Set an error and | |
| 207 // fall through to use a place holder bitmap. | |
| 208 SkErrorInternals::SetError(kParseError_SkError, "SkWriteBuffer::writeBitmap " | |
| 209 "stored the SkBitmap in an SkBitmapHeap, but " | |
| 210 "SkReadBuffer has no SkBitmapHeapReader to " | |
| 211 "retrieve the SkBitmap."); | |
| 212 } | |
| 213 } else { | |
| 214 // The writer stored false, meaning the SkBitmap was not stored in an SkBitmapHeap. | |
| 215 const size_t length = this->readUInt(); | |
| 216 if (length > 0) { | |
| 217 #ifdef DEBUG_NON_DETERMINISTIC_ASSERT | |
| 218 fDecodedBitmapIndex++; | |
| 219 #endif // DEBUG_NON_DETERMINISTIC_ASSERT | |
| 220 // A non-zero size means the SkBitmap was encoded. Read the data and pixel | |
| 221 // offset. | |
| 222 const void* data = this->skip(length); | |
| 223 const int32_t xOffset = fReader.readS32(); | |
| 224 const int32_t yOffset = fReader.readS32(); | |
| 225 if (fBitmapDecoder != NULL && fBitmapDecoder(data, length, bitmap)) { | |
| 226 if (bitmap->width() == width && bitmap->height() == height) { | |
| 227 #ifdef DEBUG_NON_DETERMINISTIC_ASSERT | |
| 228 if (0 != xOffset || 0 != yOffset) { | |
| 229 SkDebugf("SkReadBuffer::readBitmap: heights match," | |
| 230 " but offset is not zero. \nInfo about the bitmap:" | |
| 231 "\n\tIndex: %d\n\tDimensions: [%d %d]\n\tEncoded" | |
| 232 " data size: %d\n\tOffset: (%d, %d)\n", | |
| 233 fDecodedBitmapIndex, width, height, length, xOffset, | |
| 234 yOffset); | |
| 235 } | |
| 236 #endif // DEBUG_NON_DETERMINISTIC_ASSERT | |
| 237 // If the width and height match, there should be no offset. | |
| 238 SkASSERT(0 == xOffset && 0 == yOffset); | |
| 239 return; | |
| 240 } | |
| 241 | |
| 242 // This case can only be reached if extractSubset was called, so | |
| 243 // the recorded width and height must be smaller than or equal to | |
| 244 // the encoded width and height. | |
| 245 // FIXME (scroggo): This assert assumes that our decoder and the | |
| 246 // sources encoder agree on the width and height which may not | |
| 247 // always be the case. Removing until it can be investigated | |
| 248 // further. | |
| 249 //SkASSERT(width <= bitmap->width() && height <= bitmap->height()); | |
| 250 | |
| 251 SkBitmap subsetBm; | |
| 252 SkIRect subset = SkIRect::MakeXYWH(xOffset, yOffset, width, height); | |
| 253 if (bitmap->extractSubset(&subsetBm, subset)) { | |
| 254 bitmap->swap(subsetBm); | |
| 255 return; | |
| 256 } | |
| 257 } | |
| 258 // This bitmap was encoded when written, but we are unable to decode, possibly due to | |
| 259 // not having a decoder. | |
| 260 SkErrorInternals::SetError(kParseError_SkError, | |
| 261 "Could not decode bitmap. Resulting bitmap will be red."); | |
| 262 } else { | |
| 263 // A size of zero means the SkBitmap was simply flattened. | |
| 264 bitmap->unflatten(*this); | |
| 265 return; | |
| 266 } | |
| 267 } | |
| 268 // Could not read the SkBitmap. Use a placeholder bitmap. | |
| 269 bitmap->allocPixels(SkImageInfo::MakeN32Premul(width, height)); | |
| 270 bitmap->eraseColor(SK_ColorRED); | |
| 271 } | |
| 272 | |
| 273 SkTypeface* SkReadBuffer::readTypeface() { | |
| 274 | |
| 275 uint32_t index = fReader.readU32(); | |
| 276 if (0 == index || index > (unsigned)fTFCount) { | |
| 277 if (index) { | |
| 278 SkDebugf("====== typeface index %d\n", index); | |
| 279 } | |
| 280 return NULL; | |
| 281 } else { | |
| 282 SkASSERT(fTFArray); | |
| 283 return fTFArray[index - 1]; | |
| 284 } | |
| 285 } | |
| 286 | |
| 287 SkFlattenable* SkReadBuffer::readFlattenable(SkFlattenable::Type ft) { | |
| 288 // | |
| 289 // TODO: confirm that ft matches the factory we decide to use | |
| 290 // | |
| 291 | |
| 292 SkFlattenable::Factory factory = NULL; | |
| 293 | |
| 294 if (fFactoryCount > 0) { | |
| 295 int32_t index = fReader.readU32(); | |
| 296 if (0 == index) { | |
| 297 return NULL; // writer failed to give us the flattenable | |
| 298 } | |
| 299 index -= 1; // we stored the index-base-1 | |
| 300 SkASSERT(index < fFactoryCount); | |
| 301 factory = fFactoryArray[index]; | |
| 302 } else if (fFactoryTDArray) { | |
| 303 int32_t index = fReader.readU32(); | |
| 304 if (0 == index) { | |
| 305 return NULL; // writer failed to give us the flattenable | |
| 306 } | |
| 307 index -= 1; // we stored the index-base-1 | |
| 308 factory = (*fFactoryTDArray)[index]; | |
| 309 } else { | |
| 310 factory = (SkFlattenable::Factory)readFunctionPtr(); | |
| 311 if (NULL == factory) { | |
| 312 return NULL; // writer failed to give us the flattenable | |
| 313 } | |
| 314 } | |
| 315 | |
| 316 // if we get here, factory may still be null, but if that is the case, the | |
| 317 // failure was ours, not the writer. | |
| 318 SkFlattenable* obj = NULL; | |
| 319 uint32_t sizeRecorded = fReader.readU32(); | |
| 320 if (factory) { | |
| 321 uint32_t offset = fReader.offset(); | |
| 322 obj = (*factory)(*this); | |
| 323 // check that we read the amount we expected | |
| 324 uint32_t sizeRead = fReader.offset() - offset; | |
| 325 if (sizeRecorded != sizeRead) { | |
| 326 // we could try to fix up the offset... | |
| 327 sk_throw(); | |
| 328 } | |
| 329 } else { | |
| 330 // we must skip the remaining data | |
| 331 fReader.skip(sizeRecorded); | |
| 332 } | |
| 333 return obj; | |
| 334 } |
