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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkBmpCodec.h" | 8 #include "SkBmpCodec.h" |
9 #include "SkCodec_libico.h" | 9 #include "SkCodec_libico.h" |
10 #include "SkCodec_libpng.h" | 10 #include "SkCodec_libpng.h" |
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38 | 38 |
39 // Header size constants | 39 // Header size constants |
40 static const uint32_t kIcoDirectoryBytes = 6; | 40 static const uint32_t kIcoDirectoryBytes = 6; |
41 static const uint32_t kIcoDirEntryBytes = 16; | 41 static const uint32_t kIcoDirEntryBytes = 16; |
42 | 42 |
43 // Read the directory header | 43 // Read the directory header |
44 SkAutoTDeleteArray<uint8_t> dirBuffer(new uint8_t[kIcoDirectoryBytes]); | 44 SkAutoTDeleteArray<uint8_t> dirBuffer(new uint8_t[kIcoDirectoryBytes]); |
45 if (inputStream.get()->read(dirBuffer.get(), kIcoDirectoryBytes) != | 45 if (inputStream.get()->read(dirBuffer.get(), kIcoDirectoryBytes) != |
46 kIcoDirectoryBytes) { | 46 kIcoDirectoryBytes) { |
47 SkCodecPrintf("Error: unable to read ico directory header.\n"); | 47 SkCodecPrintf("Error: unable to read ico directory header.\n"); |
48 return NULL; | 48 return nullptr; |
49 } | 49 } |
50 | 50 |
51 // Process the directory header | 51 // Process the directory header |
52 const uint16_t numImages = get_short(dirBuffer.get(), 4); | 52 const uint16_t numImages = get_short(dirBuffer.get(), 4); |
53 if (0 == numImages) { | 53 if (0 == numImages) { |
54 SkCodecPrintf("Error: No images embedded in ico.\n"); | 54 SkCodecPrintf("Error: No images embedded in ico.\n"); |
55 return NULL; | 55 return nullptr; |
56 } | 56 } |
57 | 57 |
58 // Ensure that we can read all of indicated directory entries | 58 // Ensure that we can read all of indicated directory entries |
59 SkAutoTDeleteArray<uint8_t> entryBuffer(new uint8_t[numImages * kIcoDirEntry
Bytes]); | 59 SkAutoTDeleteArray<uint8_t> entryBuffer(new uint8_t[numImages * kIcoDirEntry
Bytes]); |
60 if (inputStream.get()->read(entryBuffer.get(), numImages*kIcoDirEntryBytes)
!= | 60 if (inputStream.get()->read(entryBuffer.get(), numImages*kIcoDirEntryBytes)
!= |
61 numImages*kIcoDirEntryBytes) { | 61 numImages*kIcoDirEntryBytes) { |
62 SkCodecPrintf("Error: unable to read ico directory entries.\n"); | 62 SkCodecPrintf("Error: unable to read ico directory entries.\n"); |
63 return NULL; | 63 return nullptr; |
64 } | 64 } |
65 | 65 |
66 // This structure is used to represent the vital information about entries | 66 // This structure is used to represent the vital information about entries |
67 // in the directory header. We will obtain this information for each | 67 // in the directory header. We will obtain this information for each |
68 // directory entry. | 68 // directory entry. |
69 struct Entry { | 69 struct Entry { |
70 uint32_t offset; | 70 uint32_t offset; |
71 uint32_t size; | 71 uint32_t size; |
72 }; | 72 }; |
73 SkAutoTDeleteArray<Entry> directoryEntries(new Entry[numImages]); | 73 SkAutoTDeleteArray<Entry> directoryEntries(new Entry[numImages]); |
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124 // stop trying to make codecs | 124 // stop trying to make codecs |
125 if (inputStream.get()->skip(offset - bytesRead) != offset - bytesRead) { | 125 if (inputStream.get()->skip(offset - bytesRead) != offset - bytesRead) { |
126 SkCodecPrintf("Warning: could not skip to ico offset.\n"); | 126 SkCodecPrintf("Warning: could not skip to ico offset.\n"); |
127 break; | 127 break; |
128 } | 128 } |
129 bytesRead = offset; | 129 bytesRead = offset; |
130 | 130 |
131 // Create a new stream for the embedded codec | 131 // Create a new stream for the embedded codec |
132 SkAutoTUnref<SkData> data( | 132 SkAutoTUnref<SkData> data( |
133 SkData::NewFromStream(inputStream.get(), size)); | 133 SkData::NewFromStream(inputStream.get(), size)); |
134 if (NULL == data.get()) { | 134 if (nullptr == data.get()) { |
135 SkCodecPrintf("Warning: could not create embedded stream.\n"); | 135 SkCodecPrintf("Warning: could not create embedded stream.\n"); |
136 break; | 136 break; |
137 } | 137 } |
138 SkAutoTDelete<SkMemoryStream> embeddedStream(new SkMemoryStream(data.get
())); | 138 SkAutoTDelete<SkMemoryStream> embeddedStream(new SkMemoryStream(data.get
())); |
139 bytesRead += size; | 139 bytesRead += size; |
140 | 140 |
141 // Check if the embedded codec is bmp or png and create the codec | 141 // Check if the embedded codec is bmp or png and create the codec |
142 const bool isPng = SkPngCodec::IsPng(embeddedStream); | 142 const bool isPng = SkPngCodec::IsPng(embeddedStream); |
143 SkAssertResult(embeddedStream->rewind()); | 143 SkAssertResult(embeddedStream->rewind()); |
144 SkCodec* codec = NULL; | 144 SkCodec* codec = nullptr; |
145 if (isPng) { | 145 if (isPng) { |
146 codec = SkPngCodec::NewFromStream(embeddedStream.detach()); | 146 codec = SkPngCodec::NewFromStream(embeddedStream.detach()); |
147 } else { | 147 } else { |
148 codec = SkBmpCodec::NewFromIco(embeddedStream.detach()); | 148 codec = SkBmpCodec::NewFromIco(embeddedStream.detach()); |
149 } | 149 } |
150 | 150 |
151 // Save a valid codec | 151 // Save a valid codec |
152 if (NULL != codec) { | 152 if (nullptr != codec) { |
153 codecs->push_back().reset(codec); | 153 codecs->push_back().reset(codec); |
154 } | 154 } |
155 } | 155 } |
156 | 156 |
157 // Recognize if there are no valid codecs | 157 // Recognize if there are no valid codecs |
158 if (0 == codecs->count()) { | 158 if (0 == codecs->count()) { |
159 SkCodecPrintf("Error: could not find any valid embedded ico codecs.\n"); | 159 SkCodecPrintf("Error: could not find any valid embedded ico codecs.\n"); |
160 return NULL; | 160 return nullptr; |
161 } | 161 } |
162 | 162 |
163 // Use the largest codec as a "suggestion" for image info | 163 // Use the largest codec as a "suggestion" for image info |
164 uint32_t maxSize = 0; | 164 uint32_t maxSize = 0; |
165 uint32_t maxIndex = 0; | 165 uint32_t maxIndex = 0; |
166 for (int32_t i = 0; i < codecs->count(); i++) { | 166 for (int32_t i = 0; i < codecs->count(); i++) { |
167 SkImageInfo info = codecs->operator[](i)->getInfo(); | 167 SkImageInfo info = codecs->operator[](i)->getInfo(); |
168 uint32_t size = info.width() * info.height(); | 168 uint32_t size = info.width() * info.height(); |
169 if (size > maxSize) { | 169 if (size > maxSize) { |
170 maxSize = size; | 170 maxSize = size; |
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188 // direct access to the stream. | 188 // direct access to the stream. |
189 return new SkIcoCodec(info, codecs.detach()); | 189 return new SkIcoCodec(info, codecs.detach()); |
190 } | 190 } |
191 | 191 |
192 /* | 192 /* |
193 * Creates an instance of the decoder | 193 * Creates an instance of the decoder |
194 * Called only by NewFromStream | 194 * Called only by NewFromStream |
195 */ | 195 */ |
196 SkIcoCodec::SkIcoCodec(const SkImageInfo& info, | 196 SkIcoCodec::SkIcoCodec(const SkImageInfo& info, |
197 SkTArray<SkAutoTDelete<SkCodec>, true>* codecs) | 197 SkTArray<SkAutoTDelete<SkCodec>, true>* codecs) |
198 : INHERITED(info, NULL) | 198 : INHERITED(info, nullptr) |
199 , fEmbeddedCodecs(codecs) | 199 , fEmbeddedCodecs(codecs) |
200 {} | 200 {} |
201 | 201 |
202 /* | 202 /* |
203 * Chooses the best dimensions given the desired scale | 203 * Chooses the best dimensions given the desired scale |
204 */ | 204 */ |
205 SkISize SkIcoCodec::onGetScaledDimensions(float desiredScale) const { | 205 SkISize SkIcoCodec::onGetScaledDimensions(float desiredScale) const { |
206 // We set the dimensions to the largest candidate image by default. | 206 // We set the dimensions to the largest candidate image by default. |
207 // Regardless of the scale request, this is the largest image that we | 207 // Regardless of the scale request, this is the largest image that we |
208 // will decode. | 208 // will decode. |
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268 } | 268 } |
269 | 269 |
270 // On success or partial success, return the result | 270 // On success or partial success, return the result |
271 return result; | 271 return result; |
272 } | 272 } |
273 } | 273 } |
274 | 274 |
275 SkCodecPrintf("Error: No matching candidate image in ico.\n"); | 275 SkCodecPrintf("Error: No matching candidate image in ico.\n"); |
276 return result; | 276 return result; |
277 } | 277 } |
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