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| 1 /* | |
| 2 * Copyright 2007, 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 "SkColorPriv.h" | |
| 19 #include "SkDither.h" | |
| 20 #include "SkScaledBitmapSampler.h" | |
| 21 #include "SkStream.h" | |
| 22 #include "SkTemplates.h" | |
| 23 #include "SkUtils.h" | |
| 24 | |
| 25 #include <stdio.h> | |
| 26 extern "C" { | |
| 27 #include "jpeglib.h" | |
| 28 #include "jerror.h" | |
| 29 } | |
| 30 | |
| 31 // this enables timing code to report milliseconds for an encode | |
| 32 //#define TIME_ENCODE | |
| 33 //#define TIME_DECODE | |
| 34 | |
| 35 // this enables our rgb->yuv code, which is faster than libjpeg on ARM | |
| 36 // disable for the moment, as we have some glitches when width != multiple of 4 | |
| 37 #define WE_CONVERT_TO_YUV | |
| 38 | |
| 39 ////////////////////////////////////////////////////////////////////////// | |
| 40 ////////////////////////////////////////////////////////////////////////// | |
| 41 | |
| 42 class SkJPEGImageDecoder : public SkImageDecoder { | |
| 43 public: | |
| 44 virtual Format getFormat() const { | |
| 45 return kJPEG_Format; | |
| 46 } | |
| 47 | |
| 48 protected: | |
| 49 virtual bool onDecode(SkStream* stream, SkBitmap* bm, | |
| 50 SkBitmap::Config pref, Mode); | |
| 51 }; | |
| 52 | |
| 53 SkImageDecoder* SkImageDecoder_JPEG_Factory(SkStream* stream) { | |
| 54 static const char gHeader[] = { 0xFF, 0xD8, 0xFF }; | |
| 55 static const size_t HEADER_SIZE = sizeof(gHeader); | |
| 56 | |
| 57 char buffer[HEADER_SIZE]; | |
| 58 size_t len = stream->read(buffer, HEADER_SIZE); | |
| 59 | |
| 60 if (len != HEADER_SIZE) { | |
| 61 return NULL; // can't read enough | |
| 62 } | |
| 63 | |
| 64 if (memcmp(buffer, gHeader, HEADER_SIZE)) { | |
| 65 return NULL; | |
| 66 } | |
| 67 | |
| 68 return SkNEW(SkJPEGImageDecoder); | |
| 69 } | |
| 70 | |
| 71 ////////////////////////////////////////////////////////////////////////// | |
| 72 | |
| 73 #include "SkTime.h" | |
| 74 | |
| 75 class AutoTimeMillis { | |
| 76 public: | |
| 77 AutoTimeMillis(const char label[]) : fLabel(label) { | |
| 78 if (!fLabel) { | |
| 79 fLabel = ""; | |
| 80 } | |
| 81 fNow = SkTime::GetMSecs(); | |
| 82 } | |
| 83 ~AutoTimeMillis() { | |
| 84 SkDebugf("---- Time (ms): %s %d\n", fLabel, SkTime::GetMSecs() - fNow); | |
| 85 } | |
| 86 private: | |
| 87 const char* fLabel; | |
| 88 SkMSec fNow; | |
| 89 }; | |
| 90 | |
| 91 /* our source struct for directing jpeg to our stream object | |
| 92 */ | |
| 93 struct sk_source_mgr : jpeg_source_mgr { | |
| 94 sk_source_mgr(SkStream* stream, SkImageDecoder* decoder); | |
| 95 | |
| 96 SkStream* fStream; | |
| 97 const void* fMemoryBase; | |
| 98 size_t fMemoryBaseSize; | |
| 99 SkImageDecoder* fDecoder; | |
| 100 enum { | |
| 101 kBufferSize = 1024 | |
| 102 }; | |
| 103 char fBuffer[kBufferSize]; | |
| 104 }; | |
| 105 | |
| 106 /* Automatically clean up after throwing an exception */ | |
| 107 class JPEGAutoClean { | |
| 108 public: | |
| 109 JPEGAutoClean(): cinfo_ptr(NULL) {} | |
| 110 ~JPEGAutoClean() { | |
| 111 if (cinfo_ptr) { | |
| 112 jpeg_destroy_decompress(cinfo_ptr); | |
| 113 } | |
| 114 } | |
| 115 void set(jpeg_decompress_struct* info) { | |
| 116 cinfo_ptr = info; | |
| 117 } | |
| 118 private: | |
| 119 jpeg_decompress_struct* cinfo_ptr; | |
| 120 }; | |
| 121 | |
| 122 static void sk_init_source(j_decompress_ptr cinfo) { | |
| 123 sk_source_mgr* src = (sk_source_mgr*)cinfo->src; | |
| 124 src->next_input_byte = (const JOCTET*)src->fBuffer; | |
| 125 src->bytes_in_buffer = 0; | |
| 126 } | |
| 127 | |
| 128 static boolean sk_fill_input_buffer(j_decompress_ptr cinfo) { | |
| 129 sk_source_mgr* src = (sk_source_mgr*)cinfo->src; | |
| 130 if (src->fDecoder != NULL && src->fDecoder->shouldCancelDecode()) { | |
| 131 return FALSE; | |
| 132 } | |
| 133 size_t bytes = src->fStream->read(src->fBuffer, sk_source_mgr::kBufferSize); | |
| 134 // note that JPEG is happy with less than the full read, | |
| 135 // as long as the result is non-zero | |
| 136 if (bytes == 0) { | |
| 137 return FALSE; | |
| 138 } | |
| 139 | |
| 140 src->next_input_byte = (const JOCTET*)src->fBuffer; | |
| 141 src->bytes_in_buffer = bytes; | |
| 142 return TRUE; | |
| 143 } | |
| 144 | |
| 145 static void sk_skip_input_data(j_decompress_ptr cinfo, long num_bytes) { | |
| 146 SkASSERT(num_bytes > 0); | |
| 147 | |
| 148 sk_source_mgr* src = (sk_source_mgr*)cinfo->src; | |
| 149 | |
| 150 long bytesToSkip = num_bytes - src->bytes_in_buffer; | |
| 151 | |
| 152 // check if the skip amount exceeds the current buffer | |
| 153 if (bytesToSkip > 0) { | |
| 154 size_t bytes = src->fStream->skip(bytesToSkip); | |
| 155 if (bytes != (size_t)bytesToSkip) { | |
| 156 // SkDebugf("xxxxxxxxxxxxxx failure to skip request %d actual %d\n",
bytesToSkip, bytes); | |
| 157 cinfo->err->error_exit((j_common_ptr)cinfo); | |
| 158 } | |
| 159 src->next_input_byte = (const JOCTET*)src->fBuffer; | |
| 160 src->bytes_in_buffer = 0; | |
| 161 } else { | |
| 162 src->next_input_byte += num_bytes; | |
| 163 src->bytes_in_buffer -= num_bytes; | |
| 164 } | |
| 165 } | |
| 166 | |
| 167 static boolean sk_resync_to_restart(j_decompress_ptr cinfo, int desired) { | |
| 168 sk_source_mgr* src = (sk_source_mgr*)cinfo->src; | |
| 169 | |
| 170 // what is the desired param for??? | |
| 171 | |
| 172 if (!src->fStream->rewind()) { | |
| 173 SkDebugf("xxxxxxxxxxxxxx failure to rewind\n"); | |
| 174 cinfo->err->error_exit((j_common_ptr)cinfo); | |
| 175 return FALSE; | |
| 176 } | |
| 177 src->next_input_byte = (const JOCTET*)src->fBuffer; | |
| 178 src->bytes_in_buffer = 0; | |
| 179 return TRUE; | |
| 180 } | |
| 181 | |
| 182 static void sk_term_source(j_decompress_ptr /*cinfo*/) {} | |
| 183 | |
| 184 /////////////////////////////////////////////////////////////////////////////// | |
| 185 | |
| 186 static void skmem_init_source(j_decompress_ptr cinfo) { | |
| 187 sk_source_mgr* src = (sk_source_mgr*)cinfo->src; | |
| 188 src->next_input_byte = (const JOCTET*)src->fMemoryBase; | |
| 189 src->bytes_in_buffer = src->fMemoryBaseSize; | |
| 190 } | |
| 191 | |
| 192 static boolean skmem_fill_input_buffer(j_decompress_ptr cinfo) { | |
| 193 SkDebugf("xxxxxxxxxxxxxx skmem_fill_input_buffer called\n"); | |
| 194 return FALSE; | |
| 195 } | |
| 196 | |
| 197 static void skmem_skip_input_data(j_decompress_ptr cinfo, long num_bytes) { | |
| 198 sk_source_mgr* src = (sk_source_mgr*)cinfo->src; | |
| 199 // SkDebugf("xxxxxxxxxxxxxx skmem_skip_input_data called %d\n", num_bytes); | |
| 200 src->next_input_byte = (const JOCTET*)((const char*)src->next_input_byte + n
um_bytes); | |
| 201 src->bytes_in_buffer -= num_bytes; | |
| 202 } | |
| 203 | |
| 204 static boolean skmem_resync_to_restart(j_decompress_ptr cinfo, int desired) { | |
| 205 SkDebugf("xxxxxxxxxxxxxx skmem_resync_to_restart called\n"); | |
| 206 return TRUE; | |
| 207 } | |
| 208 | |
| 209 static void skmem_term_source(j_decompress_ptr /*cinfo*/) {} | |
| 210 | |
| 211 /////////////////////////////////////////////////////////////////////////////// | |
| 212 | |
| 213 sk_source_mgr::sk_source_mgr(SkStream* stream, SkImageDecoder* decoder) : fStrea
m(stream) { | |
| 214 fDecoder = decoder; | |
| 215 const void* baseAddr = stream->getMemoryBase(); | |
| 216 if (baseAddr && false) { | |
| 217 fMemoryBase = baseAddr; | |
| 218 fMemoryBaseSize = stream->getLength(); | |
| 219 | |
| 220 init_source = skmem_init_source; | |
| 221 fill_input_buffer = skmem_fill_input_buffer; | |
| 222 skip_input_data = skmem_skip_input_data; | |
| 223 resync_to_restart = skmem_resync_to_restart; | |
| 224 term_source = skmem_term_source; | |
| 225 } else { | |
| 226 fMemoryBase = NULL; | |
| 227 fMemoryBaseSize = 0; | |
| 228 | |
| 229 init_source = sk_init_source; | |
| 230 fill_input_buffer = sk_fill_input_buffer; | |
| 231 skip_input_data = sk_skip_input_data; | |
| 232 resync_to_restart = sk_resync_to_restart; | |
| 233 term_source = sk_term_source; | |
| 234 } | |
| 235 // SkDebugf("**************** use memorybase %p %d\n", fMemoryBase, fMemoryBa
seSize); | |
| 236 } | |
| 237 | |
| 238 #include <setjmp.h> | |
| 239 | |
| 240 struct sk_error_mgr : jpeg_error_mgr { | |
| 241 jmp_buf fJmpBuf; | |
| 242 }; | |
| 243 | |
| 244 static void sk_error_exit(j_common_ptr cinfo) { | |
| 245 sk_error_mgr* error = (sk_error_mgr*)cinfo->err; | |
| 246 | |
| 247 (*error->output_message) (cinfo); | |
| 248 | |
| 249 /* Let the memory manager delete any temp files before we die */ | |
| 250 jpeg_destroy(cinfo); | |
| 251 | |
| 252 longjmp(error->fJmpBuf, -1); | |
| 253 } | |
| 254 | |
| 255 /////////////////////////////////////////////////////////////////////////////// | |
| 256 | |
| 257 static bool skip_src_rows(jpeg_decompress_struct* cinfo, void* buffer, | |
| 258 int count) { | |
| 259 for (int i = 0; i < count; i++) { | |
| 260 JSAMPLE* rowptr = (JSAMPLE*)buffer; | |
| 261 int row_count = jpeg_read_scanlines(cinfo, &rowptr, 1); | |
| 262 if (row_count != 1) { | |
| 263 return false; | |
| 264 } | |
| 265 } | |
| 266 return true; | |
| 267 } | |
| 268 | |
| 269 // This guy exists just to aid in debugging, as it allows debuggers to just | |
| 270 // set a break-point in one place to see all error exists. | |
| 271 static bool return_false(const jpeg_decompress_struct& cinfo, | |
| 272 const SkBitmap& bm, const char msg[]) { | |
| 273 #if 0 | |
| 274 SkDebugf("libjpeg error %d <%s> from %s [%d %d]", cinfo.err->msg_code, | |
| 275 cinfo.err->jpeg_message_table[cinfo.err->msg_code], msg, | |
| 276 bm.width(), bm.height()); | |
| 277 #endif | |
| 278 return false; // must always return false | |
| 279 } | |
| 280 | |
| 281 bool SkJPEGImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, | |
| 282 SkBitmap::Config prefConfig, Mode mode) { | |
| 283 #ifdef TIME_DECODE | |
| 284 AutoTimeMillis atm("JPEG Decode"); | |
| 285 #endif | |
| 286 | |
| 287 SkAutoMalloc srcStorage; | |
| 288 JPEGAutoClean autoClean; | |
| 289 | |
| 290 jpeg_decompress_struct cinfo; | |
| 291 sk_error_mgr sk_err; | |
| 292 sk_source_mgr sk_stream(stream, this); | |
| 293 | |
| 294 cinfo.err = jpeg_std_error(&sk_err); | |
| 295 sk_err.error_exit = sk_error_exit; | |
| 296 | |
| 297 // All objects need to be instantiated before this setjmp call so that | |
| 298 // they will be cleaned up properly if an error occurs. | |
| 299 if (setjmp(sk_err.fJmpBuf)) { | |
| 300 return return_false(cinfo, *bm, "setjmp"); | |
| 301 } | |
| 302 | |
| 303 jpeg_create_decompress(&cinfo); | |
| 304 autoClean.set(&cinfo); | |
| 305 | |
| 306 //jpeg_stdio_src(&cinfo, file); | |
| 307 cinfo.src = &sk_stream; | |
| 308 | |
| 309 int status = jpeg_read_header(&cinfo, true); | |
| 310 if (status != JPEG_HEADER_OK) { | |
| 311 return return_false(cinfo, *bm, "read_header"); | |
| 312 } | |
| 313 | |
| 314 /* Try to fulfill the requested sampleSize. Since jpeg can do it (when it | |
| 315 can) much faster that we, just use their num/denom api to approximate | |
| 316 the size. | |
| 317 */ | |
| 318 int sampleSize = this->getSampleSize(); | |
| 319 | |
| 320 cinfo.dct_method = JDCT_IFAST; | |
| 321 cinfo.scale_num = 1; | |
| 322 cinfo.scale_denom = sampleSize; | |
| 323 | |
| 324 /* this gives about 30% performance improvement. In theory it may | |
| 325 reduce the visual quality, in practice I'm not seeing a difference | |
| 326 */ | |
| 327 cinfo.do_fancy_upsampling = 0; | |
| 328 | |
| 329 /* this gives another few percents */ | |
| 330 cinfo.do_block_smoothing = 0; | |
| 331 | |
| 332 /* default format is RGB */ | |
| 333 cinfo.out_color_space = JCS_RGB; | |
| 334 | |
| 335 SkBitmap::Config config = prefConfig; | |
| 336 // if no user preference, see what the device recommends | |
| 337 if (config == SkBitmap::kNo_Config) | |
| 338 config = SkImageDecoder::GetDeviceConfig(); | |
| 339 | |
| 340 // only these make sense for jpegs | |
| 341 if (config != SkBitmap::kARGB_8888_Config && | |
| 342 config != SkBitmap::kARGB_4444_Config && | |
| 343 config != SkBitmap::kRGB_565_Config) { | |
| 344 config = SkBitmap::kARGB_8888_Config; | |
| 345 } | |
| 346 | |
| 347 #ifdef ANDROID_RGB | |
| 348 cinfo.dither_mode = JDITHER_NONE; | |
| 349 if (config == SkBitmap::kARGB_8888_Config) { | |
| 350 cinfo.out_color_space = JCS_RGBA_8888; | |
| 351 } else if (config == SkBitmap::kRGB_565_Config) { | |
| 352 if (sampleSize == 1) { | |
| 353 // SkScaledBitmapSampler can't handle RGB_565 yet, | |
| 354 // so don't even try. | |
| 355 cinfo.out_color_space = JCS_RGB_565; | |
| 356 if (this->getDitherImage()) { | |
| 357 cinfo.dither_mode = JDITHER_ORDERED; | |
| 358 } | |
| 359 } | |
| 360 } | |
| 361 #endif | |
| 362 | |
| 363 /* image_width and image_height are the original dimensions, available | |
| 364 after jpeg_read_header(). To see the scaled dimensions, we have to call | |
| 365 jpeg_start_decompress(), and then read output_width and output_height. | |
| 366 */ | |
| 367 if (!jpeg_start_decompress(&cinfo)) { | |
| 368 return return_false(cinfo, *bm, "start_decompress"); | |
| 369 } | |
| 370 | |
| 371 /* If we need to better match the request, we might examine the image and | |
| 372 output dimensions, and determine if the downsampling jpeg provided is | |
| 373 not sufficient. If so, we can recompute a modified sampleSize value to | |
| 374 make up the difference. | |
| 375 | |
| 376 To skip this additional scaling, just set sampleSize = 1; below. | |
| 377 */ | |
| 378 sampleSize = sampleSize * cinfo.output_width / cinfo.image_width; | |
| 379 | |
| 380 | |
| 381 // should we allow the Chooser (if present) to pick a config for us??? | |
| 382 if (!this->chooseFromOneChoice(config, cinfo.output_width, | |
| 383 cinfo.output_height)) { | |
| 384 return return_false(cinfo, *bm, "chooseFromOneChoice"); | |
| 385 } | |
| 386 | |
| 387 #ifdef ANDROID_RGB | |
| 388 /* short-circuit the SkScaledBitmapSampler when possible, as this gives | |
| 389 a significant performance boost. | |
| 390 */ | |
| 391 if (sampleSize == 1 && | |
| 392 ((config == SkBitmap::kARGB_8888_Config && | |
| 393 cinfo.out_color_space == JCS_RGBA_8888) || | |
| 394 (config == SkBitmap::kRGB_565_Config && | |
| 395 cinfo.out_color_space == JCS_RGB_565))) | |
| 396 { | |
| 397 bm->setConfig(config, cinfo.output_width, cinfo.output_height); | |
| 398 bm->setIsOpaque(true); | |
| 399 if (SkImageDecoder::kDecodeBounds_Mode == mode) { | |
| 400 return true; | |
| 401 } | |
| 402 if (!this->allocPixelRef(bm, NULL)) { | |
| 403 return return_false(cinfo, *bm, "allocPixelRef"); | |
| 404 } | |
| 405 SkAutoLockPixels alp(*bm); | |
| 406 JSAMPLE* rowptr = (JSAMPLE*)bm->getPixels(); | |
| 407 INT32 const bpr = bm->rowBytes(); | |
| 408 | |
| 409 while (cinfo.output_scanline < cinfo.output_height) { | |
| 410 int row_count = jpeg_read_scanlines(&cinfo, &rowptr, 1); | |
| 411 // if row_count == 0, then we didn't get a scanline, so abort. | |
| 412 // if we supported partial images, we might return true in this case | |
| 413 if (0 == row_count) { | |
| 414 return return_false(cinfo, *bm, "read_scanlines"); | |
| 415 } | |
| 416 if (this->shouldCancelDecode()) { | |
| 417 return return_false(cinfo, *bm, "shouldCancelDecode"); | |
| 418 } | |
| 419 rowptr += bpr; | |
| 420 } | |
| 421 jpeg_finish_decompress(&cinfo); | |
| 422 return true; | |
| 423 } | |
| 424 #endif | |
| 425 | |
| 426 // check for supported formats | |
| 427 SkScaledBitmapSampler::SrcConfig sc; | |
| 428 if (3 == cinfo.out_color_components && JCS_RGB == cinfo.out_color_space) { | |
| 429 sc = SkScaledBitmapSampler::kRGB; | |
| 430 #ifdef ANDROID_RGB | |
| 431 } else if (JCS_RGBA_8888 == cinfo.out_color_space) { | |
| 432 sc = SkScaledBitmapSampler::kRGBX; | |
| 433 //} else if (JCS_RGB_565 == cinfo.out_color_space) { | |
| 434 // sc = SkScaledBitmapSampler::kRGB_565; | |
| 435 #endif | |
| 436 } else if (1 == cinfo.out_color_components && | |
| 437 JCS_GRAYSCALE == cinfo.out_color_space) { | |
| 438 sc = SkScaledBitmapSampler::kGray; | |
| 439 } else { | |
| 440 return return_false(cinfo, *bm, "jpeg colorspace"); | |
| 441 } | |
| 442 | |
| 443 SkScaledBitmapSampler sampler(cinfo.output_width, cinfo.output_height, | |
| 444 sampleSize); | |
| 445 | |
| 446 bm->setConfig(config, sampler.scaledWidth(), sampler.scaledHeight()); | |
| 447 // jpegs are always opauqe (i.e. have no per-pixel alpha) | |
| 448 bm->setIsOpaque(true); | |
| 449 | |
| 450 if (SkImageDecoder::kDecodeBounds_Mode == mode) { | |
| 451 return true; | |
| 452 } | |
| 453 if (!this->allocPixelRef(bm, NULL)) { | |
| 454 return return_false(cinfo, *bm, "allocPixelRef"); | |
| 455 } | |
| 456 | |
| 457 SkAutoLockPixels alp(*bm); | |
| 458 if (!sampler.begin(bm, sc, this->getDitherImage())) { | |
| 459 return return_false(cinfo, *bm, "sampler.begin"); | |
| 460 } | |
| 461 | |
| 462 uint8_t* srcRow = (uint8_t*)srcStorage.alloc(cinfo.output_width * 4); | |
| 463 | |
| 464 // Possibly skip initial rows [sampler.srcY0] | |
| 465 if (!skip_src_rows(&cinfo, srcRow, sampler.srcY0())) { | |
| 466 return return_false(cinfo, *bm, "skip rows"); | |
| 467 } | |
| 468 | |
| 469 // now loop through scanlines until y == bm->height() - 1 | |
| 470 for (int y = 0;; y++) { | |
| 471 JSAMPLE* rowptr = (JSAMPLE*)srcRow; | |
| 472 int row_count = jpeg_read_scanlines(&cinfo, &rowptr, 1); | |
| 473 if (0 == row_count) { | |
| 474 return return_false(cinfo, *bm, "read_scanlines"); | |
| 475 } | |
| 476 if (this->shouldCancelDecode()) { | |
| 477 return return_false(cinfo, *bm, "shouldCancelDecode"); | |
| 478 } | |
| 479 | |
| 480 sampler.next(srcRow); | |
| 481 if (bm->height() - 1 == y) { | |
| 482 // we're done | |
| 483 break; | |
| 484 } | |
| 485 | |
| 486 if (!skip_src_rows(&cinfo, srcRow, sampler.srcDY() - 1)) { | |
| 487 return return_false(cinfo, *bm, "skip rows"); | |
| 488 } | |
| 489 } | |
| 490 | |
| 491 // we formally skip the rest, so we don't get a complaint from libjpeg | |
| 492 if (!skip_src_rows(&cinfo, srcRow, | |
| 493 cinfo.output_height - cinfo.output_scanline)) { | |
| 494 return return_false(cinfo, *bm, "skip rows"); | |
| 495 } | |
| 496 jpeg_finish_decompress(&cinfo); | |
| 497 | |
| 498 // SkDebugf("------------------- bm2 size %d [%d %d] %d\n", bm->getSize(), bm
->width(), bm->height(), bm->config()); | |
| 499 return true; | |
| 500 } | |
| 501 | |
| 502 /////////////////////////////////////////////////////////////////////////////// | |
| 503 | |
| 504 #ifdef SK_SUPPORT_IMAGE_ENCODE | |
| 505 | |
| 506 #include "SkColorPriv.h" | |
| 507 | |
| 508 // taken from jcolor.c in libjpeg | |
| 509 #if 0 // 16bit - precise but slow | |
| 510 #define CYR 19595 // 0.299 | |
| 511 #define CYG 38470 // 0.587 | |
| 512 #define CYB 7471 // 0.114 | |
| 513 | |
| 514 #define CUR -11059 // -0.16874 | |
| 515 #define CUG -21709 // -0.33126 | |
| 516 #define CUB 32768 // 0.5 | |
| 517 | |
| 518 #define CVR 32768 // 0.5 | |
| 519 #define CVG -27439 // -0.41869 | |
| 520 #define CVB -5329 // -0.08131 | |
| 521 | |
| 522 #define CSHIFT 16 | |
| 523 #else // 8bit - fast, slightly less precise | |
| 524 #define CYR 77 // 0.299 | |
| 525 #define CYG 150 // 0.587 | |
| 526 #define CYB 29 // 0.114 | |
| 527 | |
| 528 #define CUR -43 // -0.16874 | |
| 529 #define CUG -85 // -0.33126 | |
| 530 #define CUB 128 // 0.5 | |
| 531 | |
| 532 #define CVR 128 // 0.5 | |
| 533 #define CVG -107 // -0.41869 | |
| 534 #define CVB -21 // -0.08131 | |
| 535 | |
| 536 #define CSHIFT 8 | |
| 537 #endif | |
| 538 | |
| 539 static void rgb2yuv_32(uint8_t dst[], SkPMColor c) { | |
| 540 int r = SkGetPackedR32(c); | |
| 541 int g = SkGetPackedG32(c); | |
| 542 int b = SkGetPackedB32(c); | |
| 543 | |
| 544 int y = ( CYR*r + CYG*g + CYB*b ) >> CSHIFT; | |
| 545 int u = ( CUR*r + CUG*g + CUB*b ) >> CSHIFT; | |
| 546 int v = ( CVR*r + CVG*g + CVB*b ) >> CSHIFT; | |
| 547 | |
| 548 dst[0] = SkToU8(y); | |
| 549 dst[1] = SkToU8(u + 128); | |
| 550 dst[2] = SkToU8(v + 128); | |
| 551 } | |
| 552 | |
| 553 static void rgb2yuv_4444(uint8_t dst[], U16CPU c) { | |
| 554 int r = SkGetPackedR4444(c); | |
| 555 int g = SkGetPackedG4444(c); | |
| 556 int b = SkGetPackedB4444(c); | |
| 557 | |
| 558 int y = ( CYR*r + CYG*g + CYB*b ) >> (CSHIFT - 4); | |
| 559 int u = ( CUR*r + CUG*g + CUB*b ) >> (CSHIFT - 4); | |
| 560 int v = ( CVR*r + CVG*g + CVB*b ) >> (CSHIFT - 4); | |
| 561 | |
| 562 dst[0] = SkToU8(y); | |
| 563 dst[1] = SkToU8(u + 128); | |
| 564 dst[2] = SkToU8(v + 128); | |
| 565 } | |
| 566 | |
| 567 static void rgb2yuv_16(uint8_t dst[], U16CPU c) { | |
| 568 int r = SkGetPackedR16(c); | |
| 569 int g = SkGetPackedG16(c); | |
| 570 int b = SkGetPackedB16(c); | |
| 571 | |
| 572 int y = ( 2*CYR*r + CYG*g + 2*CYB*b ) >> (CSHIFT - 2); | |
| 573 int u = ( 2*CUR*r + CUG*g + 2*CUB*b ) >> (CSHIFT - 2); | |
| 574 int v = ( 2*CVR*r + CVG*g + 2*CVB*b ) >> (CSHIFT - 2); | |
| 575 | |
| 576 dst[0] = SkToU8(y); | |
| 577 dst[1] = SkToU8(u + 128); | |
| 578 dst[2] = SkToU8(v + 128); | |
| 579 } | |
| 580 | |
| 581 /////////////////////////////////////////////////////////////////////////////// | |
| 582 | |
| 583 typedef void (*WriteScanline)(uint8_t* SK_RESTRICT dst, | |
| 584 const void* SK_RESTRICT src, int width, | |
| 585 const SkPMColor* SK_RESTRICT ctable); | |
| 586 | |
| 587 static void Write_32_YUV(uint8_t* SK_RESTRICT dst, | |
| 588 const void* SK_RESTRICT srcRow, int width, | |
| 589 const SkPMColor*) { | |
| 590 const uint32_t* SK_RESTRICT src = (const uint32_t*)srcRow; | |
| 591 while (--width >= 0) { | |
| 592 #ifdef WE_CONVERT_TO_YUV | |
| 593 rgb2yuv_32(dst, *src++); | |
| 594 #else | |
| 595 uint32_t c = *src++; | |
| 596 dst[0] = SkGetPackedR32(c); | |
| 597 dst[1] = SkGetPackedG32(c); | |
| 598 dst[2] = SkGetPackedB32(c); | |
| 599 #endif | |
| 600 dst += 3; | |
| 601 } | |
| 602 } | |
| 603 | |
| 604 static void Write_4444_YUV(uint8_t* SK_RESTRICT dst, | |
| 605 const void* SK_RESTRICT srcRow, int width, | |
| 606 const SkPMColor*) { | |
| 607 const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)srcRow; | |
| 608 while (--width >= 0) { | |
| 609 #ifdef WE_CONVERT_TO_YUV | |
| 610 rgb2yuv_4444(dst, *src++); | |
| 611 #else | |
| 612 SkPMColor16 c = *src++; | |
| 613 dst[0] = SkPacked4444ToR32(c); | |
| 614 dst[1] = SkPacked4444ToG32(c); | |
| 615 dst[2] = SkPacked4444ToB32(c); | |
| 616 #endif | |
| 617 dst += 3; | |
| 618 } | |
| 619 } | |
| 620 | |
| 621 static void Write_16_YUV(uint8_t* SK_RESTRICT dst, | |
| 622 const void* SK_RESTRICT srcRow, int width, | |
| 623 const SkPMColor*) { | |
| 624 const uint16_t* SK_RESTRICT src = (const uint16_t*)srcRow; | |
| 625 while (--width >= 0) { | |
| 626 #ifdef WE_CONVERT_TO_YUV | |
| 627 rgb2yuv_16(dst, *src++); | |
| 628 #else | |
| 629 uint16_t c = *src++; | |
| 630 dst[0] = SkPacked16ToR32(c); | |
| 631 dst[1] = SkPacked16ToG32(c); | |
| 632 dst[2] = SkPacked16ToB32(c); | |
| 633 #endif | |
| 634 dst += 3; | |
| 635 } | |
| 636 } | |
| 637 | |
| 638 static void Write_Index_YUV(uint8_t* SK_RESTRICT dst, | |
| 639 const void* SK_RESTRICT srcRow, int width, | |
| 640 const SkPMColor* SK_RESTRICT ctable) { | |
| 641 const uint8_t* SK_RESTRICT src = (const uint8_t*)srcRow; | |
| 642 while (--width >= 0) { | |
| 643 #ifdef WE_CONVERT_TO_YUV | |
| 644 rgb2yuv_32(dst, ctable[*src++]); | |
| 645 #else | |
| 646 uint32_t c = ctable[*src++]; | |
| 647 dst[0] = SkGetPackedR32(c); | |
| 648 dst[1] = SkGetPackedG32(c); | |
| 649 dst[2] = SkGetPackedB32(c); | |
| 650 #endif | |
| 651 dst += 3; | |
| 652 } | |
| 653 } | |
| 654 | |
| 655 static WriteScanline ChooseWriter(const SkBitmap& bm) { | |
| 656 switch (bm.config()) { | |
| 657 case SkBitmap::kARGB_8888_Config: | |
| 658 return Write_32_YUV; | |
| 659 case SkBitmap::kRGB_565_Config: | |
| 660 return Write_16_YUV; | |
| 661 case SkBitmap::kARGB_4444_Config: | |
| 662 return Write_4444_YUV; | |
| 663 case SkBitmap::kIndex8_Config: | |
| 664 return Write_Index_YUV; | |
| 665 default: | |
| 666 return NULL; | |
| 667 } | |
| 668 } | |
| 669 | |
| 670 struct sk_destination_mgr : jpeg_destination_mgr { | |
| 671 sk_destination_mgr(SkWStream* stream); | |
| 672 | |
| 673 SkWStream* fStream; | |
| 674 | |
| 675 enum { | |
| 676 kBufferSize = 1024 | |
| 677 }; | |
| 678 uint8_t fBuffer[kBufferSize]; | |
| 679 }; | |
| 680 | |
| 681 static void sk_init_destination(j_compress_ptr cinfo) { | |
| 682 sk_destination_mgr* dest = (sk_destination_mgr*)cinfo->dest; | |
| 683 | |
| 684 dest->next_output_byte = dest->fBuffer; | |
| 685 dest->free_in_buffer = sk_destination_mgr::kBufferSize; | |
| 686 } | |
| 687 | |
| 688 static boolean sk_empty_output_buffer(j_compress_ptr cinfo) { | |
| 689 sk_destination_mgr* dest = (sk_destination_mgr*)cinfo->dest; | |
| 690 | |
| 691 // if (!dest->fStream->write(dest->fBuffer, sk_destination_mgr::kBufferSize - d
est->free_in_buffer)) | |
| 692 if (!dest->fStream->write(dest->fBuffer, sk_destination_mgr::kBufferSize)) { | |
| 693 ERREXIT(cinfo, JERR_FILE_WRITE); | |
| 694 return false; | |
| 695 } | |
| 696 | |
| 697 dest->next_output_byte = dest->fBuffer; | |
| 698 dest->free_in_buffer = sk_destination_mgr::kBufferSize; | |
| 699 return TRUE; | |
| 700 } | |
| 701 | |
| 702 static void sk_term_destination (j_compress_ptr cinfo) { | |
| 703 sk_destination_mgr* dest = (sk_destination_mgr*)cinfo->dest; | |
| 704 | |
| 705 size_t size = sk_destination_mgr::kBufferSize - dest->free_in_buffer; | |
| 706 if (size > 0) { | |
| 707 if (!dest->fStream->write(dest->fBuffer, size)) { | |
| 708 ERREXIT(cinfo, JERR_FILE_WRITE); | |
| 709 return; | |
| 710 } | |
| 711 } | |
| 712 dest->fStream->flush(); | |
| 713 } | |
| 714 | |
| 715 sk_destination_mgr::sk_destination_mgr(SkWStream* stream) | |
| 716 : fStream(stream) { | |
| 717 this->init_destination = sk_init_destination; | |
| 718 this->empty_output_buffer = sk_empty_output_buffer; | |
| 719 this->term_destination = sk_term_destination; | |
| 720 } | |
| 721 | |
| 722 class SkJPEGImageEncoder : public SkImageEncoder { | |
| 723 protected: | |
| 724 virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) { | |
| 725 #ifdef TIME_ENCODE | |
| 726 AutoTimeMillis atm("JPEG Encode"); | |
| 727 #endif | |
| 728 | |
| 729 const WriteScanline writer = ChooseWriter(bm); | |
| 730 if (NULL == writer) { | |
| 731 return false; | |
| 732 } | |
| 733 | |
| 734 SkAutoLockPixels alp(bm); | |
| 735 if (NULL == bm.getPixels()) { | |
| 736 return false; | |
| 737 } | |
| 738 | |
| 739 jpeg_compress_struct cinfo; | |
| 740 sk_error_mgr sk_err; | |
| 741 sk_destination_mgr sk_wstream(stream); | |
| 742 | |
| 743 // allocate these before set call setjmp | |
| 744 SkAutoMalloc oneRow; | |
| 745 SkAutoLockColors ctLocker; | |
| 746 | |
| 747 cinfo.err = jpeg_std_error(&sk_err); | |
| 748 sk_err.error_exit = sk_error_exit; | |
| 749 if (setjmp(sk_err.fJmpBuf)) { | |
| 750 return false; | |
| 751 } | |
| 752 jpeg_create_compress(&cinfo); | |
| 753 | |
| 754 cinfo.dest = &sk_wstream; | |
| 755 cinfo.image_width = bm.width(); | |
| 756 cinfo.image_height = bm.height(); | |
| 757 cinfo.input_components = 3; | |
| 758 #ifdef WE_CONVERT_TO_YUV | |
| 759 cinfo.in_color_space = JCS_YCbCr; | |
| 760 #else | |
| 761 cinfo.in_color_space = JCS_RGB; | |
| 762 #endif | |
| 763 cinfo.input_gamma = 1; | |
| 764 | |
| 765 jpeg_set_defaults(&cinfo); | |
| 766 jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values
*/); | |
| 767 cinfo.dct_method = JDCT_IFAST; | |
| 768 | |
| 769 jpeg_start_compress(&cinfo, TRUE); | |
| 770 | |
| 771 const int width = bm.width(); | |
| 772 uint8_t* oneRowP = (uint8_t*)oneRow.alloc(width * 3); | |
| 773 | |
| 774 const SkPMColor* colors = ctLocker.lockColors(bm); | |
| 775 const void* srcRow = bm.getPixels(); | |
| 776 | |
| 777 while (cinfo.next_scanline < cinfo.image_height) { | |
| 778 JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */ | |
| 779 | |
| 780 writer(oneRowP, srcRow, width, colors); | |
| 781 row_pointer[0] = oneRowP; | |
| 782 (void) jpeg_write_scanlines(&cinfo, row_pointer, 1); | |
| 783 srcRow = (const void*)((const char*)srcRow + bm.rowBytes()); | |
| 784 } | |
| 785 | |
| 786 jpeg_finish_compress(&cinfo); | |
| 787 jpeg_destroy_compress(&cinfo); | |
| 788 | |
| 789 return true; | |
| 790 } | |
| 791 }; | |
| 792 | |
| 793 SkImageEncoder* SkImageEncoder_JPEG_Factory(); | |
| 794 SkImageEncoder* SkImageEncoder_JPEG_Factory() { | |
| 795 return SkNEW(SkJPEGImageEncoder); | |
| 796 } | |
| 797 | |
| 798 #endif /* SK_SUPPORT_IMAGE_ENCODE */ | |
| 799 | |
| 800 ////////////////////////////////////////////////////////////////////////// | |
| 801 ////////////////////////////////////////////////////////////////////////// | |
| 802 | |
| 803 #ifdef SK_DEBUG | |
| 804 | |
| 805 void SkImageDecoder::UnitTest() { | |
| 806 SkBitmap bm; | |
| 807 | |
| 808 (void)SkImageDecoder::DecodeFile("logo.jpg", &bm); | |
| 809 } | |
| 810 | |
| 811 #endif | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/