commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2010, The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "SkImageDecoder.h" |
| 18 | #include "SkImageEncoder.h" |
| 19 | #include "SkColorPriv.h" |
| 20 | #include "SkScaledBitmapSampler.h" |
| 21 | #include "SkStream.h" |
| 22 | #include "SkTemplates.h" |
| 23 | #include "SkUtils.h" |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 24 | |
| 25 | // A WebP decoder only, on top of (subset of) libwebp |
| 26 | // For more information on WebP image format, and libwebp library, see: |
| 27 | // http://code.google.com/speed/webp/ |
| 28 | // http://www.webmproject.org/code/#libwebp_webp_image_decoder_library |
| 29 | // http://review.webmproject.org/gitweb?p=libwebp.git |
| 30 | |
| 31 | #include <stdio.h> |
| 32 | extern "C" { |
| 33 | // If moving libwebp out of skia source tree, path for webp headers must be |
| 34 | // updated accordingly. Here, we enforce using local copy in webp sub-directory. |
| 35 | #include "webp/decode.h" |
| 36 | #include "webp/encode.h" |
| 37 | } |
| 38 | |
| 39 | #ifdef ANDROID |
| 40 | #include <cutils/properties.h> |
| 41 | |
| 42 | // Key to lookup the size of memory buffer set in system property |
| 43 | static const char KEY_MEM_CAP[] = "ro.media.dec.webp.memcap"; |
| 44 | #endif |
| 45 | |
| 46 | // this enables timing code to report milliseconds for a decode |
| 47 | //#define TIME_DECODE |
| 48 | |
| 49 | ////////////////////////////////////////////////////////////////////////// |
| 50 | ////////////////////////////////////////////////////////////////////////// |
| 51 | |
| 52 | // Define VP8 I/O on top of Skia stream |
| 53 | |
| 54 | ////////////////////////////////////////////////////////////////////////// |
| 55 | ////////////////////////////////////////////////////////////////////////// |
| 56 | |
| 57 | static const size_t WEBP_VP8_HEADER_SIZE = 64; |
| 58 | static const size_t WEBP_IDECODE_BUFFER_SZ = (1 << 16); |
| 59 | |
| 60 | // Parse headers of RIFF container, and check for valid Webp (VP8) content. |
| 61 | static bool webp_parse_header(SkStream* stream, int* width, int* height, int* alpha) { |
| 62 | unsigned char buffer[WEBP_VP8_HEADER_SIZE]; |
| 63 | const uint32_t contentSize = stream->getLength(); |
| 64 | const size_t len = stream->read(buffer, WEBP_VP8_HEADER_SIZE); |
| 65 | const uint32_t read_bytes = |
| 66 | (contentSize < WEBP_VP8_HEADER_SIZE) ? contentSize : WEBP_VP8_HEADER_SIZE; |
| 67 | if (len != read_bytes) { |
| 68 | return false; // can't read enough |
| 69 | } |
| 70 | |
| 71 | WebPBitstreamFeatures features; |
| 72 | VP8StatusCode status = WebPGetFeatures(buffer, read_bytes, &features); |
| 73 | if (VP8_STATUS_OK != status) { |
| 74 | return false; // Invalid WebP file. |
| 75 | } |
| 76 | *width = features.width; |
| 77 | *height = features.height; |
| 78 | *alpha = features.has_alpha; |
| 79 | |
| 80 | // sanity check for image size that's about to be decoded. |
| 81 | { |
| 82 | Sk64 size; |
| 83 | size.setMul(*width, *height); |
| 84 | if (size.isNeg() || !size.is32()) { |
| 85 | return false; |
| 86 | } |
| 87 | // now check that if we are 4-bytes per pixel, we also don't overflow |
| 88 | if (size.get32() > (0x7FFFFFFF >> 2)) { |
| 89 | return false; |
| 90 | } |
| 91 | } |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | class SkWEBPImageDecoder: public SkImageDecoder { |
| 96 | public: |
| 97 | SkWEBPImageDecoder() { |
| 98 | fInputStream = NULL; |
| 99 | fOrigWidth = 0; |
| 100 | fOrigHeight = 0; |
| 101 | fHasAlpha = 0; |
| 102 | } |
| 103 | virtual ~SkWEBPImageDecoder() { |
| 104 | SkSafeUnref(fInputStream); |
| 105 | } |
| 106 | |
| 107 | virtual Format getFormat() const SK_OVERRIDE { |
| 108 | return kWEBP_Format; |
| 109 | } |
| 110 | |
| 111 | protected: |
| 112 | virtual bool onBuildTileIndex(SkStream *stream, int *width, int *height) SK_OVERRIDE; |
scroggo@google.com | 7e6fcee | 2013-05-03 20:14:28 +0000 | [diff] [blame] | 113 | virtual bool onDecodeSubset(SkBitmap* bitmap, const SkIRect& rect) SK_OVERRIDE; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 114 | virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE; |
| 115 | |
| 116 | private: |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 117 | /** |
| 118 | * Called when determining the output config to request to webp. |
| 119 | * If the image does not have alpha, there is no need to premultiply. |
| 120 | * If the caller wants unpremultiplied colors, that is respected. |
| 121 | */ |
| 122 | bool shouldPremultiply() const { |
| 123 | return SkToBool(fHasAlpha) && !this->getRequireUnpremultipliedColors(); |
| 124 | } |
| 125 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 126 | bool setDecodeConfig(SkBitmap* decodedBitmap, int width, int height); |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 127 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 128 | SkStream* fInputStream; |
| 129 | int fOrigWidth; |
| 130 | int fOrigHeight; |
| 131 | int fHasAlpha; |
| 132 | |
| 133 | typedef SkImageDecoder INHERITED; |
| 134 | }; |
| 135 | |
| 136 | ////////////////////////////////////////////////////////////////////////// |
| 137 | |
| 138 | #ifdef TIME_DECODE |
| 139 | |
| 140 | #include "SkTime.h" |
| 141 | |
| 142 | class AutoTimeMillis { |
| 143 | public: |
| 144 | AutoTimeMillis(const char label[]) : |
| 145 | fLabel(label) { |
| 146 | if (NULL == fLabel) { |
| 147 | fLabel = ""; |
| 148 | } |
| 149 | fNow = SkTime::GetMSecs(); |
| 150 | } |
| 151 | ~AutoTimeMillis() { |
| 152 | SkDebugf("---- Time (ms): %s %d\n", fLabel, SkTime::GetMSecs() - fNow); |
| 153 | } |
| 154 | private: |
| 155 | const char* fLabel; |
| 156 | SkMSec fNow; |
| 157 | }; |
| 158 | |
| 159 | #endif |
| 160 | |
| 161 | /////////////////////////////////////////////////////////////////////////////// |
| 162 | |
| 163 | // This guy exists just to aid in debugging, as it allows debuggers to just |
| 164 | // set a break-point in one place to see all error exists. |
| 165 | static bool return_false(const SkBitmap& bm, const char msg[]) { |
| 166 | SkDEBUGF(("libwebp error %s [%d %d]", msg, bm.width(), bm.height())); |
| 167 | return false; // must always return false |
| 168 | } |
| 169 | |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 170 | static WEBP_CSP_MODE webp_decode_mode(const SkBitmap* decodedBitmap, bool premultiply) { |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 171 | WEBP_CSP_MODE mode = MODE_LAST; |
| 172 | SkBitmap::Config config = decodedBitmap->config(); |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 173 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 174 | if (config == SkBitmap::kARGB_8888_Config) { |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 175 | mode = premultiply ? MODE_rgbA : MODE_RGBA; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 176 | } else if (config == SkBitmap::kARGB_4444_Config) { |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 177 | mode = premultiply ? MODE_rgbA_4444 : MODE_RGBA_4444; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 178 | } else if (config == SkBitmap::kRGB_565_Config) { |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 179 | mode = MODE_RGB_565; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 180 | } |
| 181 | SkASSERT(MODE_LAST != mode); |
| 182 | return mode; |
| 183 | } |
| 184 | |
| 185 | // Incremental WebP image decoding. Reads input buffer of 64K size iteratively |
| 186 | // and decodes this block to appropriate color-space as per config object. |
| 187 | static bool webp_idecode(SkStream* stream, WebPDecoderConfig* config) { |
| 188 | WebPIDecoder* idec = WebPIDecode(NULL, 0, config); |
| 189 | if (NULL == idec) { |
| 190 | WebPFreeDecBuffer(&config->output); |
| 191 | return false; |
| 192 | } |
| 193 | |
| 194 | stream->rewind(); |
| 195 | const uint32_t contentSize = stream->getLength(); |
| 196 | const uint32_t readBufferSize = (contentSize < WEBP_IDECODE_BUFFER_SZ) ? |
| 197 | contentSize : WEBP_IDECODE_BUFFER_SZ; |
| 198 | SkAutoMalloc srcStorage(readBufferSize); |
| 199 | unsigned char* input = (uint8_t*)srcStorage.get(); |
| 200 | if (NULL == input) { |
| 201 | WebPIDelete(idec); |
| 202 | WebPFreeDecBuffer(&config->output); |
| 203 | return false; |
| 204 | } |
| 205 | |
scroggo@google.com | 80e18c9 | 2013-08-09 19:22:00 +0000 | [diff] [blame^] | 206 | bool success = true; |
| 207 | VP8StatusCode status = VP8_STATUS_SUSPENDED; |
| 208 | do { |
| 209 | const size_t bytesRead = stream->read(input, readBufferSize); |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 210 | if (0 == bytesRead) { |
scroggo@google.com | 80e18c9 | 2013-08-09 19:22:00 +0000 | [diff] [blame^] | 211 | success = false; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 212 | break; |
| 213 | } |
| 214 | |
scroggo@google.com | 80e18c9 | 2013-08-09 19:22:00 +0000 | [diff] [blame^] | 215 | status = WebPIAppend(idec, input, bytesRead); |
| 216 | if (VP8_STATUS_OK != status && VP8_STATUS_SUSPENDED != status) { |
| 217 | success = false; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 218 | break; |
| 219 | } |
scroggo@google.com | 80e18c9 | 2013-08-09 19:22:00 +0000 | [diff] [blame^] | 220 | } while (VP8_STATUS_OK != status); |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 221 | srcStorage.free(); |
| 222 | WebPIDelete(idec); |
| 223 | WebPFreeDecBuffer(&config->output); |
| 224 | |
scroggo@google.com | 80e18c9 | 2013-08-09 19:22:00 +0000 | [diff] [blame^] | 225 | return success; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | static bool webp_get_config_resize(WebPDecoderConfig* config, |
| 229 | SkBitmap* decodedBitmap, |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 230 | int width, int height, bool premultiply) { |
| 231 | WEBP_CSP_MODE mode = webp_decode_mode(decodedBitmap, premultiply); |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 232 | if (MODE_LAST == mode) { |
| 233 | return false; |
| 234 | } |
| 235 | |
| 236 | if (0 == WebPInitDecoderConfig(config)) { |
| 237 | return false; |
| 238 | } |
| 239 | |
| 240 | config->output.colorspace = mode; |
| 241 | config->output.u.RGBA.rgba = (uint8_t*)decodedBitmap->getPixels(); |
| 242 | config->output.u.RGBA.stride = decodedBitmap->rowBytes(); |
| 243 | config->output.u.RGBA.size = decodedBitmap->getSize(); |
| 244 | config->output.is_external_memory = 1; |
| 245 | |
| 246 | if (width != decodedBitmap->width() || height != decodedBitmap->height()) { |
| 247 | config->options.use_scaling = 1; |
| 248 | config->options.scaled_width = decodedBitmap->width(); |
| 249 | config->options.scaled_height = decodedBitmap->height(); |
| 250 | } |
| 251 | |
| 252 | return true; |
| 253 | } |
| 254 | |
| 255 | static bool webp_get_config_resize_crop(WebPDecoderConfig* config, |
| 256 | SkBitmap* decodedBitmap, |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 257 | const SkIRect& region, bool premultiply) { |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 258 | |
| 259 | if (!webp_get_config_resize(config, decodedBitmap, region.width(), |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 260 | region.height(), premultiply)) { |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 261 | return false; |
| 262 | } |
| 263 | |
| 264 | config->options.use_cropping = 1; |
| 265 | config->options.crop_left = region.fLeft; |
| 266 | config->options.crop_top = region.fTop; |
| 267 | config->options.crop_width = region.width(); |
| 268 | config->options.crop_height = region.height(); |
| 269 | |
| 270 | return true; |
| 271 | } |
| 272 | |
| 273 | bool SkWEBPImageDecoder::setDecodeConfig(SkBitmap* decodedBitmap, |
| 274 | int width, int height) { |
commit-bot@chromium.org | bff83f6 | 2013-03-14 15:18:08 +0000 | [diff] [blame] | 275 | SkBitmap::Config config = this->getPrefConfig(k32Bit_SrcDepth, SkToBool(fHasAlpha)); |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 276 | |
| 277 | // YUV converter supports output in RGB565, RGBA4444 and RGBA8888 formats. |
| 278 | if (fHasAlpha) { |
| 279 | if (config != SkBitmap::kARGB_4444_Config) { |
| 280 | config = SkBitmap::kARGB_8888_Config; |
| 281 | } |
| 282 | } else { |
| 283 | if (config != SkBitmap::kRGB_565_Config && |
| 284 | config != SkBitmap::kARGB_4444_Config) { |
| 285 | config = SkBitmap::kARGB_8888_Config; |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | if (!this->chooseFromOneChoice(config, width, height)) { |
| 290 | return false; |
| 291 | } |
| 292 | |
| 293 | decodedBitmap->setConfig(config, width, height, 0); |
| 294 | |
| 295 | decodedBitmap->setIsOpaque(!fHasAlpha); |
| 296 | |
| 297 | return true; |
| 298 | } |
| 299 | |
| 300 | bool SkWEBPImageDecoder::onBuildTileIndex(SkStream* stream, |
| 301 | int *width, int *height) { |
| 302 | int origWidth, origHeight, hasAlpha; |
| 303 | if (!webp_parse_header(stream, &origWidth, &origHeight, &hasAlpha)) { |
| 304 | return false; |
| 305 | } |
| 306 | |
| 307 | stream->rewind(); |
| 308 | *width = origWidth; |
| 309 | *height = origHeight; |
| 310 | |
| 311 | SkRefCnt_SafeAssign(this->fInputStream, stream); |
| 312 | this->fOrigWidth = origWidth; |
| 313 | this->fOrigHeight = origHeight; |
| 314 | this->fHasAlpha = hasAlpha; |
| 315 | |
| 316 | return true; |
| 317 | } |
| 318 | |
| 319 | static bool is_config_compatible(const SkBitmap& bitmap) { |
| 320 | SkBitmap::Config config = bitmap.config(); |
| 321 | return config == SkBitmap::kARGB_4444_Config || |
| 322 | config == SkBitmap::kRGB_565_Config || |
| 323 | config == SkBitmap::kARGB_8888_Config; |
| 324 | } |
| 325 | |
scroggo@google.com | 7e6fcee | 2013-05-03 20:14:28 +0000 | [diff] [blame] | 326 | bool SkWEBPImageDecoder::onDecodeSubset(SkBitmap* decodedBitmap, |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 327 | const SkIRect& region) { |
| 328 | SkIRect rect = SkIRect::MakeWH(fOrigWidth, fOrigHeight); |
| 329 | |
| 330 | if (!rect.intersect(region)) { |
| 331 | // If the requested region is entirely outsides the image, return false |
| 332 | return false; |
| 333 | } |
| 334 | |
| 335 | const int sampleSize = this->getSampleSize(); |
| 336 | SkScaledBitmapSampler sampler(rect.width(), rect.height(), sampleSize); |
| 337 | const int width = sampler.scaledWidth(); |
| 338 | const int height = sampler.scaledHeight(); |
| 339 | |
| 340 | // The image can be decoded directly to decodedBitmap if |
| 341 | // 1. the region is within the image range |
| 342 | // 2. bitmap's config is compatible |
| 343 | // 3. bitmap's size is same as the required region (after sampled) |
| 344 | bool directDecode = (rect == region) && |
| 345 | (decodedBitmap->isNull() || |
| 346 | (is_config_compatible(*decodedBitmap) && |
| 347 | (decodedBitmap->width() == width) && |
| 348 | (decodedBitmap->height() == height))); |
commit-bot@chromium.org | a9f142e | 2013-05-09 16:15:20 +0000 | [diff] [blame] | 349 | |
| 350 | SkBitmap tmpBitmap; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 351 | SkBitmap *bitmap = decodedBitmap; |
| 352 | |
| 353 | if (!directDecode) { |
commit-bot@chromium.org | a9f142e | 2013-05-09 16:15:20 +0000 | [diff] [blame] | 354 | bitmap = &tmpBitmap; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | if (bitmap->isNull()) { |
| 358 | if (!setDecodeConfig(bitmap, width, height)) { |
| 359 | return false; |
| 360 | } |
| 361 | // alloc from native heap if it is a temp bitmap. (prevent GC) |
| 362 | bool allocResult = (bitmap == decodedBitmap) |
| 363 | ? allocPixelRef(bitmap, NULL) |
| 364 | : bitmap->allocPixels(); |
| 365 | if (!allocResult) { |
| 366 | return return_false(*decodedBitmap, "allocPixelRef"); |
| 367 | } |
| 368 | } else { |
| 369 | // This is also called in setDecodeConfig in above block. |
| 370 | // i.e., when bitmap->isNull() is true. |
| 371 | if (!chooseFromOneChoice(bitmap->config(), width, height)) { |
| 372 | return false; |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | SkAutoLockPixels alp(*bitmap); |
| 377 | WebPDecoderConfig config; |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 378 | if (!webp_get_config_resize_crop(&config, bitmap, rect, |
| 379 | this->shouldPremultiply())) { |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 380 | return false; |
| 381 | } |
| 382 | |
| 383 | // Decode the WebP image data stream using WebP incremental decoding for |
| 384 | // the specified cropped image-region. |
| 385 | if (!webp_idecode(this->fInputStream, &config)) { |
| 386 | return false; |
| 387 | } |
| 388 | |
| 389 | if (!directDecode) { |
| 390 | cropBitmap(decodedBitmap, bitmap, sampleSize, region.x(), region.y(), |
| 391 | region.width(), region.height(), rect.x(), rect.y()); |
| 392 | } |
| 393 | return true; |
| 394 | } |
| 395 | |
| 396 | bool SkWEBPImageDecoder::onDecode(SkStream* stream, SkBitmap* decodedBitmap, |
| 397 | Mode mode) { |
| 398 | #ifdef TIME_DECODE |
| 399 | AutoTimeMillis atm("WEBP Decode"); |
| 400 | #endif |
| 401 | |
| 402 | int origWidth, origHeight, hasAlpha; |
| 403 | if (!webp_parse_header(stream, &origWidth, &origHeight, &hasAlpha)) { |
| 404 | return false; |
| 405 | } |
| 406 | this->fHasAlpha = hasAlpha; |
| 407 | |
| 408 | const int sampleSize = this->getSampleSize(); |
| 409 | SkScaledBitmapSampler sampler(origWidth, origHeight, sampleSize); |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 410 | if (!setDecodeConfig(decodedBitmap, sampler.scaledWidth(), |
| 411 | sampler.scaledHeight())) { |
| 412 | return false; |
| 413 | } |
| 414 | |
scroggo@google.com | bc69ce9 | 2013-07-09 15:45:14 +0000 | [diff] [blame] | 415 | // If only bounds are requested, done |
| 416 | if (SkImageDecoder::kDecodeBounds_Mode == mode) { |
| 417 | return true; |
| 418 | } |
| 419 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 420 | if (!this->allocPixelRef(decodedBitmap, NULL)) { |
| 421 | return return_false(*decodedBitmap, "allocPixelRef"); |
| 422 | } |
| 423 | |
| 424 | SkAutoLockPixels alp(*decodedBitmap); |
| 425 | |
| 426 | WebPDecoderConfig config; |
| 427 | if (!webp_get_config_resize(&config, decodedBitmap, origWidth, origHeight, |
scroggo@google.com | 2bbc2c9 | 2013-06-14 15:33:20 +0000 | [diff] [blame] | 428 | this->shouldPremultiply())) { |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 429 | return false; |
| 430 | } |
| 431 | |
| 432 | // Decode the WebP image data stream using WebP incremental decoding. |
| 433 | return webp_idecode(stream, &config); |
| 434 | } |
| 435 | |
| 436 | /////////////////////////////////////////////////////////////////////////////// |
| 437 | |
| 438 | typedef void (*ScanlineImporter)(const uint8_t* in, uint8_t* out, int width, |
| 439 | const SkPMColor* SK_RESTRICT ctable); |
| 440 | |
| 441 | static void ARGB_8888_To_RGB(const uint8_t* in, uint8_t* rgb, int width, |
| 442 | const SkPMColor*) { |
| 443 | const uint32_t* SK_RESTRICT src = (const uint32_t*)in; |
| 444 | for (int i = 0; i < width; ++i) { |
| 445 | const uint32_t c = *src++; |
| 446 | rgb[0] = SkGetPackedR32(c); |
| 447 | rgb[1] = SkGetPackedG32(c); |
| 448 | rgb[2] = SkGetPackedB32(c); |
| 449 | rgb += 3; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | static void RGB_565_To_RGB(const uint8_t* in, uint8_t* rgb, int width, |
| 454 | const SkPMColor*) { |
| 455 | const uint16_t* SK_RESTRICT src = (const uint16_t*)in; |
| 456 | for (int i = 0; i < width; ++i) { |
| 457 | const uint16_t c = *src++; |
| 458 | rgb[0] = SkPacked16ToR32(c); |
| 459 | rgb[1] = SkPacked16ToG32(c); |
| 460 | rgb[2] = SkPacked16ToB32(c); |
| 461 | rgb += 3; |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | static void ARGB_4444_To_RGB(const uint8_t* in, uint8_t* rgb, int width, |
| 466 | const SkPMColor*) { |
| 467 | const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)in; |
| 468 | for (int i = 0; i < width; ++i) { |
| 469 | const SkPMColor16 c = *src++; |
| 470 | rgb[0] = SkPacked4444ToR32(c); |
| 471 | rgb[1] = SkPacked4444ToG32(c); |
| 472 | rgb[2] = SkPacked4444ToB32(c); |
| 473 | rgb += 3; |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | static void Index8_To_RGB(const uint8_t* in, uint8_t* rgb, int width, |
| 478 | const SkPMColor* SK_RESTRICT ctable) { |
| 479 | const uint8_t* SK_RESTRICT src = (const uint8_t*)in; |
| 480 | for (int i = 0; i < width; ++i) { |
| 481 | const uint32_t c = ctable[*src++]; |
| 482 | rgb[0] = SkGetPackedR32(c); |
| 483 | rgb[1] = SkGetPackedG32(c); |
| 484 | rgb[2] = SkGetPackedB32(c); |
| 485 | rgb += 3; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | static ScanlineImporter ChooseImporter(const SkBitmap::Config& config) { |
| 490 | switch (config) { |
| 491 | case SkBitmap::kARGB_8888_Config: |
| 492 | return ARGB_8888_To_RGB; |
| 493 | case SkBitmap::kRGB_565_Config: |
| 494 | return RGB_565_To_RGB; |
| 495 | case SkBitmap::kARGB_4444_Config: |
| 496 | return ARGB_4444_To_RGB; |
| 497 | case SkBitmap::kIndex8_Config: |
| 498 | return Index8_To_RGB; |
| 499 | default: |
| 500 | return NULL; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | static int stream_writer(const uint8_t* data, size_t data_size, |
| 505 | const WebPPicture* const picture) { |
| 506 | SkWStream* const stream = (SkWStream*)picture->custom_ptr; |
| 507 | return stream->write(data, data_size) ? 1 : 0; |
| 508 | } |
| 509 | |
| 510 | class SkWEBPImageEncoder : public SkImageEncoder { |
| 511 | protected: |
| 512 | virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) SK_OVERRIDE; |
| 513 | |
| 514 | private: |
| 515 | typedef SkImageEncoder INHERITED; |
| 516 | }; |
| 517 | |
| 518 | bool SkWEBPImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bm, |
| 519 | int quality) { |
| 520 | const SkBitmap::Config config = bm.getConfig(); |
| 521 | const ScanlineImporter scanline_import = ChooseImporter(config); |
| 522 | if (NULL == scanline_import) { |
| 523 | return false; |
| 524 | } |
| 525 | |
| 526 | SkAutoLockPixels alp(bm); |
| 527 | SkAutoLockColors ctLocker; |
| 528 | if (NULL == bm.getPixels()) { |
| 529 | return false; |
| 530 | } |
| 531 | |
| 532 | WebPConfig webp_config; |
commit-bot@chromium.org | bff83f6 | 2013-03-14 15:18:08 +0000 | [diff] [blame] | 533 | if (!WebPConfigPreset(&webp_config, WEBP_PRESET_DEFAULT, (float) quality)) { |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 534 | return false; |
| 535 | } |
| 536 | |
| 537 | WebPPicture pic; |
| 538 | WebPPictureInit(&pic); |
| 539 | pic.width = bm.width(); |
| 540 | pic.height = bm.height(); |
| 541 | pic.writer = stream_writer; |
| 542 | pic.custom_ptr = (void*)stream; |
| 543 | |
| 544 | const SkPMColor* colors = ctLocker.lockColors(bm); |
| 545 | const uint8_t* src = (uint8_t*)bm.getPixels(); |
| 546 | const int rgbStride = pic.width * 3; |
| 547 | |
| 548 | // Import (for each scanline) the bit-map image (in appropriate color-space) |
| 549 | // to RGB color space. |
| 550 | uint8_t* rgb = new uint8_t[rgbStride * pic.height]; |
| 551 | for (int y = 0; y < pic.height; ++y) { |
| 552 | scanline_import(src + y * bm.rowBytes(), rgb + y * rgbStride, |
| 553 | pic.width, colors); |
| 554 | } |
| 555 | |
reed@google.com | bda74d3 | 2013-03-14 15:25:45 +0000 | [diff] [blame] | 556 | bool ok = SkToBool(WebPPictureImportRGB(&pic, rgb, rgbStride)); |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 557 | delete[] rgb; |
| 558 | |
| 559 | ok = ok && WebPEncode(&webp_config, &pic); |
| 560 | WebPPictureFree(&pic); |
| 561 | |
| 562 | return ok; |
| 563 | } |
| 564 | |
| 565 | |
| 566 | /////////////////////////////////////////////////////////////////////////////// |
| 567 | DEFINE_DECODER_CREATOR(WEBPImageDecoder); |
| 568 | DEFINE_ENCODER_CREATOR(WEBPImageEncoder); |
| 569 | /////////////////////////////////////////////////////////////////////////////// |
| 570 | |
| 571 | #include "SkTRegistry.h" |
| 572 | |
| 573 | static SkImageDecoder* sk_libwebp_dfactory(SkStream* stream) { |
| 574 | int width, height, hasAlpha; |
| 575 | if (!webp_parse_header(stream, &width, &height, &hasAlpha)) { |
| 576 | return NULL; |
| 577 | } |
| 578 | |
| 579 | // Magic matches, call decoder |
| 580 | return SkNEW(SkWEBPImageDecoder); |
| 581 | } |
| 582 | |
scroggo@google.com | 39edf4c | 2013-04-25 17:33:51 +0000 | [diff] [blame] | 583 | static SkImageDecoder::Format get_format_webp(SkStream* stream) { |
| 584 | int width, height, hasAlpha; |
| 585 | if (webp_parse_header(stream, &width, &height, &hasAlpha)) { |
| 586 | return SkImageDecoder::kWEBP_Format; |
| 587 | } |
| 588 | return SkImageDecoder::kUnknown_Format; |
| 589 | } |
| 590 | |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 591 | static SkImageEncoder* sk_libwebp_efactory(SkImageEncoder::Type t) { |
| 592 | return (SkImageEncoder::kWEBP_Type == t) ? SkNEW(SkWEBPImageEncoder) : NULL; |
| 593 | } |
| 594 | |
| 595 | static SkTRegistry<SkImageDecoder*, SkStream*> gDReg(sk_libwebp_dfactory); |
scroggo@google.com | 39edf4c | 2013-04-25 17:33:51 +0000 | [diff] [blame] | 596 | static SkTRegistry<SkImageDecoder::Format, SkStream*> gFormatReg(get_format_webp); |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 597 | static SkTRegistry<SkImageEncoder*, SkImageEncoder::Type> gEReg(sk_libwebp_efactory); |