epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2006 The Android Open Source Project |
| 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 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 8 | |
| 9 | #include "SkImageDecoder.h" |
| 10 | #include "SkBitmap.h" |
scroggo@google.com | f8d7d27 | 2013-02-22 21:38:35 +0000 | [diff] [blame] | 11 | #include "SkImagePriv.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 12 | #include "SkPixelRef.h" |
| 13 | #include "SkStream.h" |
| 14 | #include "SkTemplates.h" |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame^] | 15 | #include "SkCanvas.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 16 | |
robertphillips@google.com | 15e9d3e | 2012-06-21 20:25:03 +0000 | [diff] [blame] | 17 | SK_DEFINE_INST_COUNT(SkImageDecoder::Peeker) |
| 18 | SK_DEFINE_INST_COUNT(SkImageDecoder::Chooser) |
| 19 | SK_DEFINE_INST_COUNT(SkImageDecoderFactory) |
| 20 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame^] | 21 | const char *SkImageDecoder::sFormatName[] = { |
| 22 | "Unknown Format", |
| 23 | "BMP", |
| 24 | "GIF", |
| 25 | "ICO", |
| 26 | "JPEG", |
| 27 | "PNG", |
| 28 | "WBMP", |
| 29 | "WEBP", |
| 30 | }; |
| 31 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 32 | static SkBitmap::Config gDeviceConfig = SkBitmap::kNo_Config; |
| 33 | |
| 34 | SkBitmap::Config SkImageDecoder::GetDeviceConfig() |
| 35 | { |
| 36 | return gDeviceConfig; |
| 37 | } |
| 38 | |
| 39 | void SkImageDecoder::SetDeviceConfig(SkBitmap::Config config) |
| 40 | { |
| 41 | gDeviceConfig = config; |
| 42 | } |
| 43 | |
| 44 | /////////////////////////////////////////////////////////////////////////////// |
| 45 | |
| 46 | SkImageDecoder::SkImageDecoder() |
| 47 | : fPeeker(NULL), fChooser(NULL), fAllocator(NULL), fSampleSize(1), |
reed@android.com | 3f1f06a | 2010-03-03 21:04:12 +0000 | [diff] [blame] | 48 | fDefaultPref(SkBitmap::kNo_Config), fDitherImage(true), |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame^] | 49 | fUsePrefTable(false),fPreferQualityOverSpeed(false) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | SkImageDecoder::~SkImageDecoder() { |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 53 | SkSafeUnref(fPeeker); |
| 54 | SkSafeUnref(fChooser); |
| 55 | SkSafeUnref(fAllocator); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | SkImageDecoder::Format SkImageDecoder::getFormat() const { |
| 59 | return kUnknown_Format; |
| 60 | } |
| 61 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame^] | 62 | const char* SkImageDecoder::getFormatName() const { |
| 63 | SkASSERT(SK_ARRAY_COUNT(sFormatName) == kLastKnownFormat); |
| 64 | return sFormatName[this->getFormat()]; |
| 65 | } |
| 66 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 67 | SkImageDecoder::Peeker* SkImageDecoder::setPeeker(Peeker* peeker) { |
| 68 | SkRefCnt_SafeAssign(fPeeker, peeker); |
| 69 | return peeker; |
| 70 | } |
| 71 | |
| 72 | SkImageDecoder::Chooser* SkImageDecoder::setChooser(Chooser* chooser) { |
| 73 | SkRefCnt_SafeAssign(fChooser, chooser); |
| 74 | return chooser; |
| 75 | } |
| 76 | |
| 77 | SkBitmap::Allocator* SkImageDecoder::setAllocator(SkBitmap::Allocator* alloc) { |
| 78 | SkRefCnt_SafeAssign(fAllocator, alloc); |
| 79 | return alloc; |
| 80 | } |
| 81 | |
| 82 | void SkImageDecoder::setSampleSize(int size) { |
| 83 | if (size < 1) { |
| 84 | size = 1; |
| 85 | } |
| 86 | fSampleSize = size; |
| 87 | } |
| 88 | |
| 89 | bool SkImageDecoder::chooseFromOneChoice(SkBitmap::Config config, int width, |
| 90 | int height) const { |
| 91 | Chooser* chooser = fChooser; |
| 92 | |
| 93 | if (NULL == chooser) { // no chooser, we just say YES to decoding :) |
| 94 | return true; |
| 95 | } |
| 96 | chooser->begin(1); |
| 97 | chooser->inspect(0, config, width, height); |
| 98 | return chooser->choose() == 0; |
| 99 | } |
| 100 | |
| 101 | bool SkImageDecoder::allocPixelRef(SkBitmap* bitmap, |
| 102 | SkColorTable* ctable) const { |
| 103 | return bitmap->allocPixels(fAllocator, ctable); |
| 104 | } |
| 105 | |
| 106 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | b6137c3 | 2009-07-29 20:56:52 +0000 | [diff] [blame] | 107 | |
reed@android.com | 3f1f06a | 2010-03-03 21:04:12 +0000 | [diff] [blame] | 108 | void SkImageDecoder::setPrefConfigTable(const SkBitmap::Config pref[6]) { |
| 109 | if (NULL == pref) { |
| 110 | fUsePrefTable = false; |
| 111 | } else { |
| 112 | fUsePrefTable = true; |
| 113 | memcpy(fPrefTable, pref, sizeof(fPrefTable)); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | SkBitmap::Config SkImageDecoder::getPrefConfig(SrcDepth srcDepth, |
| 118 | bool srcHasAlpha) const { |
| 119 | SkBitmap::Config config; |
| 120 | |
| 121 | if (fUsePrefTable) { |
| 122 | int index = 0; |
| 123 | switch (srcDepth) { |
| 124 | case kIndex_SrcDepth: |
| 125 | index = 0; |
| 126 | break; |
| 127 | case k16Bit_SrcDepth: |
| 128 | index = 2; |
| 129 | break; |
| 130 | case k32Bit_SrcDepth: |
| 131 | index = 4; |
| 132 | break; |
| 133 | } |
| 134 | if (srcHasAlpha) { |
| 135 | index += 1; |
| 136 | } |
| 137 | config = fPrefTable[index]; |
| 138 | } else { |
| 139 | config = fDefaultPref; |
| 140 | } |
| 141 | |
| 142 | if (SkBitmap::kNo_Config == config) { |
| 143 | config = SkImageDecoder::GetDeviceConfig(); |
| 144 | } |
| 145 | return config; |
| 146 | } |
| 147 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 148 | bool SkImageDecoder::decode(SkStream* stream, SkBitmap* bm, |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame^] | 149 | SkBitmap::Config pref, Mode mode, bool reuseBitmap) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 150 | // we reset this to false before calling onDecode |
| 151 | fShouldCancelDecode = false; |
reed@android.com | 3f1f06a | 2010-03-03 21:04:12 +0000 | [diff] [blame] | 152 | // assign this, for use by getPrefConfig(), in case fUsePrefTable is false |
| 153 | fDefaultPref = pref; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 154 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame^] | 155 | if (reuseBitmap) { |
| 156 | SkAutoLockPixels alp(*bm); |
| 157 | if (NULL != bm->getPixels()) { |
| 158 | return this->onDecode(stream, bm, mode); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | // pass a temporary bitmap, so that if we return false, we are assured of |
| 163 | // leaving the caller's bitmap untouched. |
| 164 | SkBitmap tmp; |
reed@android.com | 3f1f06a | 2010-03-03 21:04:12 +0000 | [diff] [blame] | 165 | if (!this->onDecode(stream, &tmp, mode)) { |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 166 | return false; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 167 | } |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 168 | bm->swap(tmp); |
| 169 | return true; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 170 | } |
| 171 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame^] | 172 | bool SkImageDecoder::decodeRegion(SkBitmap* bm, const SkIRect& rect, |
| 173 | SkBitmap::Config pref) { |
| 174 | // we reset this to false before calling onDecodeRegion |
| 175 | fShouldCancelDecode = false; |
| 176 | // assign this, for use by getPrefConfig(), in case fUsePrefTable is false |
| 177 | fDefaultPref = pref; |
| 178 | |
| 179 | return this->onDecodeRegion(bm, rect); |
| 180 | } |
| 181 | |
| 182 | bool SkImageDecoder::buildTileIndex(SkStream* stream, |
| 183 | int *width, int *height) { |
| 184 | // we reset this to false before calling onBuildTileIndex |
| 185 | fShouldCancelDecode = false; |
| 186 | |
| 187 | return this->onBuildTileIndex(stream, width, height); |
| 188 | } |
| 189 | |
| 190 | void SkImageDecoder::cropBitmap(SkBitmap *dst, SkBitmap *src, int sampleSize, |
| 191 | int dstX, int dstY, int width, int height, |
| 192 | int srcX, int srcY) { |
| 193 | int w = width / sampleSize; |
| 194 | int h = height / sampleSize; |
| 195 | // if the destination has no pixels then we must allocate them. |
| 196 | if (dst->isNull()) { |
| 197 | dst->setConfig(src->getConfig(), w, h); |
| 198 | dst->setIsOpaque(src->isOpaque()); |
| 199 | |
| 200 | if (!this->allocPixelRef(dst, NULL)) { |
| 201 | SkDEBUGF(("failed to allocate pixels needed to crop the bitmap")); |
| 202 | return; |
| 203 | } |
| 204 | } |
| 205 | // check to see if the destination is large enough to decode the desired |
| 206 | // region. If this assert fails we will just draw as much of the source |
| 207 | // into the destination that we can. |
| 208 | SkASSERT(dst->width() >= w && dst->height() >= h); |
| 209 | |
| 210 | // Set the Src_Mode for the paint to prevent transparency issue in the |
| 211 | // dest in the event that the dest was being re-used. |
| 212 | SkPaint paint; |
| 213 | paint.setXfermodeMode(SkXfermode::kSrc_Mode); |
| 214 | |
| 215 | SkCanvas canvas(*dst); |
| 216 | canvas.drawSprite(*src, (srcX - dstX) / sampleSize, |
| 217 | (srcY - dstY) / sampleSize, |
| 218 | &paint); |
| 219 | } |
| 220 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 221 | /////////////////////////////////////////////////////////////////////////////// |
| 222 | |
| 223 | bool SkImageDecoder::DecodeFile(const char file[], SkBitmap* bm, |
reed@android.com | b3ade9d | 2009-06-15 13:04:45 +0000 | [diff] [blame] | 224 | SkBitmap::Config pref, Mode mode, Format* format) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 225 | SkASSERT(file); |
| 226 | SkASSERT(bm); |
| 227 | |
| 228 | SkFILEStream stream(file); |
| 229 | if (stream.isValid()) { |
reed@android.com | b3ade9d | 2009-06-15 13:04:45 +0000 | [diff] [blame] | 230 | if (SkImageDecoder::DecodeStream(&stream, bm, pref, mode, format)) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 231 | bm->pixelRef()->setURI(file); |
tomhudson@google.com | 1a36621 | 2012-01-03 14:42:08 +0000 | [diff] [blame] | 232 | return true; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 233 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 234 | } |
| 235 | return false; |
| 236 | } |
| 237 | |
| 238 | bool SkImageDecoder::DecodeMemory(const void* buffer, size_t size, SkBitmap* bm, |
reed@android.com | b3ade9d | 2009-06-15 13:04:45 +0000 | [diff] [blame] | 239 | SkBitmap::Config pref, Mode mode, Format* format) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 240 | if (0 == size) { |
| 241 | return false; |
| 242 | } |
| 243 | SkASSERT(buffer); |
| 244 | |
| 245 | SkMemoryStream stream(buffer, size); |
reed@android.com | b3ade9d | 2009-06-15 13:04:45 +0000 | [diff] [blame] | 246 | return SkImageDecoder::DecodeStream(&stream, bm, pref, mode, format); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 247 | } |
| 248 | |
scroggo@google.com | f8d7d27 | 2013-02-22 21:38:35 +0000 | [diff] [blame] | 249 | class TargetAllocator : public SkBitmap::Allocator { |
| 250 | |
| 251 | public: |
| 252 | TargetAllocator(void* target) |
| 253 | : fTarget(target) {} |
| 254 | |
| 255 | virtual bool allocPixelRef(SkBitmap* bm, SkColorTable* ct) SK_OVERRIDE { |
| 256 | // SkColorTable is not supported by Info/Target model. |
| 257 | SkASSERT(NULL == ct); |
| 258 | bm->setPixels(fTarget); |
| 259 | return true; |
| 260 | } |
| 261 | |
| 262 | private: |
| 263 | void* fTarget; |
| 264 | }; |
| 265 | |
| 266 | bool SkImageDecoder::DecodeMemoryToTarget(const void* buffer, size_t size, |
| 267 | SkImage::Info* info, |
| 268 | const SkBitmapFactory::Target* target) { |
| 269 | if (NULL == info) { |
| 270 | return false; |
| 271 | } |
| 272 | // FIXME: Just to get this working, implement in terms of existing |
| 273 | // ImageDecoder calls. |
| 274 | SkBitmap bm; |
| 275 | SkMemoryStream stream(buffer, size); |
| 276 | SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(&stream)); |
| 277 | if (decoder.get() != NULL && decoder->decode(&stream, &bm, kDecodeBounds_Mode)) { |
| 278 | // Now set info properly |
| 279 | if (!SkBitmapToImageInfo(bm, info)) { |
| 280 | return false; |
| 281 | } |
| 282 | |
| 283 | // SkBitmapToImageInfo will return false if Index8 is used. kIndex8 |
| 284 | // is not supported by the Info/Target model, since kIndex8 requires |
| 285 | // an SkColorTable, which this model does not keep track of. |
| 286 | SkASSERT(bm.config() != SkBitmap::kIndex8_Config); |
| 287 | |
| 288 | if (NULL == target) { |
| 289 | return true; |
| 290 | } |
| 291 | |
| 292 | if (target->fRowBytes != (uint32_t) bm.rowBytes()) { |
| 293 | if (target->fRowBytes < SkImageMinRowBytes(*info)) { |
| 294 | SkASSERT(!"Desired row bytes is too small"); |
| 295 | return false; |
| 296 | } |
| 297 | bm.setConfig(bm.config(), bm.width(), bm.height(), target->fRowBytes); |
| 298 | } |
| 299 | |
| 300 | TargetAllocator allocator(target->fAddr); |
| 301 | decoder->setAllocator(&allocator); |
| 302 | stream.rewind(); |
| 303 | bool success = decoder->decode(&stream, &bm, kDecodePixels_Mode); |
| 304 | // Remove the allocator, since it's on the stack. |
| 305 | decoder->setAllocator(NULL); |
| 306 | return success; |
| 307 | } |
| 308 | return false; |
| 309 | } |
| 310 | |
| 311 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 312 | bool SkImageDecoder::DecodeStream(SkStream* stream, SkBitmap* bm, |
reed@android.com | b3ade9d | 2009-06-15 13:04:45 +0000 | [diff] [blame] | 313 | SkBitmap::Config pref, Mode mode, Format* format) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 314 | SkASSERT(stream); |
| 315 | SkASSERT(bm); |
| 316 | |
| 317 | bool success = false; |
| 318 | SkImageDecoder* codec = SkImageDecoder::Factory(stream); |
| 319 | |
| 320 | if (NULL != codec) { |
| 321 | success = codec->decode(stream, bm, pref, mode); |
reed@android.com | b3ade9d | 2009-06-15 13:04:45 +0000 | [diff] [blame] | 322 | if (success && format) { |
| 323 | *format = codec->getFormat(); |
| 324 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 325 | delete codec; |
| 326 | } |
| 327 | return success; |
| 328 | } |