halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 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 | |
commit-bot@chromium.org | 1ad518b | 2013-12-18 18:33:15 +0000 | [diff] [blame] | 8 | #include "SkData.h" |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 9 | #include "SkDecodingImageGenerator.h" |
halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 10 | #include "SkImageDecoder.h" |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 11 | #include "SkImageInfo.h" |
halcanary@google.com | edd370f | 2013-12-10 21:11:12 +0000 | [diff] [blame] | 12 | #include "SkImageGenerator.h" |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 13 | #include "SkImagePriv.h" |
| 14 | #include "SkStream.h" |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 15 | #include "SkUtils.h" |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 16 | |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 17 | static bool equal_modulo_alpha(const SkImageInfo& a, const SkImageInfo& b) { |
| 18 | return a.width() == b.width() && a.height() == b.height() && |
| 19 | a.colorType() == b.colorType(); |
| 20 | } |
| 21 | |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 22 | namespace { |
| 23 | /** |
| 24 | * Special allocator used by getPixels(). Uses preallocated memory |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 25 | * provided if possible, else fall-back on the default allocator |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 26 | */ |
| 27 | class TargetAllocator : public SkBitmap::Allocator { |
| 28 | public: |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 29 | TargetAllocator(const SkImageInfo& info, |
| 30 | void* target, |
| 31 | size_t rowBytes) |
| 32 | : fInfo(info) |
| 33 | , fTarget(target) |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 34 | , fRowBytes(rowBytes) |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 35 | {} |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 36 | |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 37 | bool isReady() { return (fTarget != NULL); } |
| 38 | |
| 39 | virtual bool allocPixelRef(SkBitmap* bm, SkColorTable* ct) { |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 40 | if (NULL == fTarget || !equal_modulo_alpha(fInfo, bm->info())) { |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 41 | // Call default allocator. |
| 42 | return bm->allocPixels(NULL, ct); |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 43 | } |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 44 | |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 45 | // TODO(halcanary): verify that all callers of this function |
| 46 | // will respect new RowBytes. Will be moot once rowbytes belongs |
| 47 | // to PixelRef. |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 48 | bm->installPixels(fInfo, fTarget, fRowBytes, NULL, NULL); |
| 49 | |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 50 | fTarget = NULL; // never alloc same pixels twice! |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 51 | return true; |
| 52 | } |
| 53 | |
| 54 | private: |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 55 | const SkImageInfo fInfo; |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 56 | void* fTarget; // Block of memory to be supplied as pixel memory |
| 57 | // in allocPixelRef. Must be large enough to hold |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 58 | // a bitmap described by fInfo and fRowBytes |
| 59 | const size_t fRowBytes; // rowbytes for the destination bitmap |
| 60 | |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 61 | typedef SkBitmap::Allocator INHERITED; |
| 62 | }; |
halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 63 | |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 64 | // TODO(halcanary): Give this macro a better name and move it into SkTypes.h |
| 65 | #ifdef SK_DEBUG |
| 66 | #define SkCheckResult(expr, value) SkASSERT((value) == (expr)) |
| 67 | #else |
| 68 | #define SkCheckResult(expr, value) (void)(expr) |
| 69 | #endif |
| 70 | |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 71 | #ifdef SK_DEBUG |
| 72 | inline bool check_alpha(SkAlphaType reported, SkAlphaType actual) { |
| 73 | return ((reported == actual) |
| 74 | || ((reported == kPremul_SkAlphaType) |
| 75 | && (actual == kOpaque_SkAlphaType))); |
| 76 | } |
| 77 | #endif // SK_DEBUG |
| 78 | |
| 79 | } // namespace |
| 80 | //////////////////////////////////////////////////////////////////////////////// |
| 81 | |
| 82 | SkDecodingImageGenerator::SkDecodingImageGenerator( |
| 83 | SkData* data, |
| 84 | SkStreamRewindable* stream, |
| 85 | const SkImageInfo& info, |
| 86 | int sampleSize, |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 87 | bool ditherImage) |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 88 | : fData(data) |
| 89 | , fStream(stream) |
| 90 | , fInfo(info) |
| 91 | , fSampleSize(sampleSize) |
| 92 | , fDitherImage(ditherImage) |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 93 | { |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 94 | SkASSERT(stream != NULL); |
| 95 | SkSafeRef(fData); // may be NULL. |
| 96 | } |
| 97 | |
| 98 | SkDecodingImageGenerator::~SkDecodingImageGenerator() { |
| 99 | SkSafeUnref(fData); |
| 100 | fStream->unref(); |
| 101 | } |
| 102 | |
| 103 | bool SkDecodingImageGenerator::getInfo(SkImageInfo* info) { |
| 104 | if (info != NULL) { |
| 105 | *info = fInfo; |
| 106 | } |
| 107 | return true; |
| 108 | } |
| 109 | |
halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 110 | SkData* SkDecodingImageGenerator::refEncodedData() { |
halcanary@google.com | 2c7c7ee | 2013-12-05 18:31:42 +0000 | [diff] [blame] | 111 | // This functionality is used in `gm --serialize` |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 112 | // Does not encode options. |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 113 | if (fData != NULL) { |
| 114 | return SkSafeRef(fData); |
| 115 | } |
| 116 | // TODO(halcanary): SkStreamRewindable needs a refData() function |
| 117 | // which returns a cheap copy of the underlying data. |
| 118 | if (!fStream->rewind()) { |
| 119 | return NULL; |
| 120 | } |
| 121 | size_t length = fStream->getLength(); |
| 122 | if (0 == length) { |
| 123 | return NULL; |
| 124 | } |
| 125 | void* buffer = sk_malloc_flags(length, 0); |
| 126 | SkCheckResult(fStream->read(buffer, length), length); |
| 127 | fData = SkData::NewFromMalloc(buffer, length); |
| 128 | return SkSafeRef(fData); |
halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 129 | } |
| 130 | |
halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 131 | bool SkDecodingImageGenerator::getPixels(const SkImageInfo& info, |
| 132 | void* pixels, |
| 133 | size_t rowBytes) { |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 134 | if (NULL == pixels) { |
| 135 | return false; |
| 136 | } |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 137 | if (fInfo != info) { |
| 138 | // The caller has specified a different info. This is an |
| 139 | // error for this kind of SkImageGenerator. Use the Options |
| 140 | // to change the settings. |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 141 | return false; |
| 142 | } |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 143 | if (info.minRowBytes() > rowBytes) { |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 144 | // The caller has specified a bad rowBytes. |
| 145 | return false; |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 146 | } |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 147 | |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 148 | SkAssertResult(fStream->rewind()); |
| 149 | SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(fStream)); |
| 150 | if (NULL == decoder.get()) { |
| 151 | return false; |
| 152 | } |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 153 | decoder->setDitherImage(fDitherImage); |
| 154 | decoder->setSampleSize(fSampleSize); |
commit-bot@chromium.org | 1ad518b | 2013-12-18 18:33:15 +0000 | [diff] [blame] | 155 | |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 156 | SkBitmap bitmap; |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 157 | TargetAllocator allocator(fInfo, pixels, rowBytes); |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 158 | decoder->setAllocator(&allocator); |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 159 | // TODO: need to be able to pass colortype directly to decoder |
| 160 | SkBitmap::Config legacyConfig = SkColorTypeToBitmapConfig(info.colorType()); |
| 161 | bool success = decoder->decode(fStream, &bitmap, legacyConfig, |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 162 | SkImageDecoder::kDecodePixels_Mode); |
| 163 | decoder->setAllocator(NULL); |
| 164 | if (!success) { |
| 165 | return false; |
| 166 | } |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 167 | if (allocator.isReady()) { // Did not use pixels! |
| 168 | SkBitmap bm; |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 169 | SkASSERT(bitmap.canCopyTo(info.colorType())); |
| 170 | bool copySuccess = bitmap.copyTo(&bm, info.colorType(), &allocator); |
| 171 | if (!copySuccess || allocator.isReady()) { |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 172 | SkDEBUGFAIL("bitmap.copyTo(requestedConfig) failed."); |
| 173 | // Earlier we checked canCopyto(); we expect consistency. |
| 174 | return false; |
| 175 | } |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 176 | SkASSERT(check_alpha(info.alphaType(), bm.alphaType())); |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 177 | } else { |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 178 | SkASSERT(check_alpha(info.alphaType(), bitmap.alphaType())); |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 179 | } |
| 180 | return true; |
halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 181 | } |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 182 | |
| 183 | SkImageGenerator* SkDecodingImageGenerator::Create( |
| 184 | SkData* data, |
| 185 | const SkDecodingImageGenerator::Options& opts) { |
halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 186 | SkASSERT(data != NULL); |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 187 | if (NULL == data) { |
| 188 | return NULL; |
| 189 | } |
| 190 | SkStreamRewindable* stream = SkNEW_ARGS(SkMemoryStream, (data)); |
| 191 | SkASSERT(stream != NULL); |
| 192 | SkASSERT(stream->unique()); |
| 193 | return SkDecodingImageGenerator::Create(data, stream, opts); |
halcanary@google.com | ad04eb4 | 2013-11-21 15:32:08 +0000 | [diff] [blame] | 194 | } |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 195 | |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 196 | SkImageGenerator* SkDecodingImageGenerator::Create( |
| 197 | SkStreamRewindable* stream, |
| 198 | const SkDecodingImageGenerator::Options& opts) { |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 199 | SkASSERT(stream != NULL); |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 200 | SkASSERT(stream->unique()); |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 201 | if ((stream == NULL) || !stream->unique()) { |
| 202 | SkSafeUnref(stream); |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 203 | return NULL; |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 204 | } |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 205 | return SkDecodingImageGenerator::Create(NULL, stream, opts); |
| 206 | } |
| 207 | |
| 208 | // A contructor-type function that returns NULL on failure. This |
| 209 | // prevents the returned SkImageGenerator from ever being in a bad |
| 210 | // state. Called by both Create() functions |
| 211 | SkImageGenerator* SkDecodingImageGenerator::Create( |
| 212 | SkData* data, |
| 213 | SkStreamRewindable* stream, |
| 214 | const SkDecodingImageGenerator::Options& opts) { |
| 215 | SkASSERT(stream); |
| 216 | SkAutoTUnref<SkStreamRewindable> autoStream(stream); // always unref this. |
| 217 | if (opts.fUseRequestedColorType && |
| 218 | (kIndex_8_SkColorType == opts.fRequestedColorType)) { |
| 219 | // We do not support indexed color with SkImageGenerators, |
| 220 | return NULL; |
| 221 | } |
| 222 | SkAssertResult(autoStream->rewind()); |
| 223 | SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(autoStream)); |
| 224 | if (NULL == decoder.get()) { |
| 225 | return NULL; |
| 226 | } |
| 227 | SkBitmap bitmap; |
| 228 | decoder->setSampleSize(opts.fSampleSize); |
| 229 | if (!decoder->decode(stream, &bitmap, |
| 230 | SkImageDecoder::kDecodeBounds_Mode)) { |
| 231 | return NULL; |
| 232 | } |
| 233 | if (bitmap.config() == SkBitmap::kNo_Config) { |
| 234 | return NULL; |
| 235 | } |
| 236 | |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 237 | SkImageInfo info = bitmap.info(); |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 238 | |
| 239 | if (!opts.fUseRequestedColorType) { |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 240 | // Use default |
| 241 | if (kIndex_8_SkColorType == bitmap.colorType()) { |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 242 | // We don't support kIndex8 because we don't support |
| 243 | // colortables in this workflow. |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 244 | info.fColorType = kPMColor_SkColorType; |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 245 | } |
| 246 | } else { |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 247 | if (!bitmap.canCopyTo(opts.fRequestedColorType)) { |
| 248 | SkASSERT(bitmap.colorType() != opts.fRequestedColorType); |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 249 | return NULL; // Can not translate to needed config. |
| 250 | } |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 251 | info.fColorType = opts.fRequestedColorType; |
halcanary@google.com | 3d50ea1 | 2014-01-02 13:15:13 +0000 | [diff] [blame] | 252 | } |
| 253 | return SkNEW_ARGS(SkDecodingImageGenerator, |
| 254 | (data, autoStream.detach(), info, |
commit-bot@chromium.org | 8a2ad3c | 2014-02-23 03:59:35 +0000 | [diff] [blame^] | 255 | opts.fSampleSize, opts.fDitherImage)); |
halcanary@google.com | 29d9693 | 2013-12-09 13:45:02 +0000 | [diff] [blame] | 256 | } |