1 // Copyright 2011 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // Speed-critical functions. 11 // 12 // Author: Skal (pascal.massimino@gmail.com) 13 14 #ifndef WEBP_DSP_DSP_H_ 15 #define WEBP_DSP_DSP_H_ 16 17 #ifdef HAVE_CONFIG_H 18 #include "src/webp/config.h" 19 #endif 20 21 #include "src/webp/types.h" 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 #define BPS 32 // this is the common stride for enc/dec 28 29 //------------------------------------------------------------------------------ 30 // CPU detection 31 32 #if defined(__GNUC__) 33 # define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__) 34 # define LOCAL_GCC_PREREQ(maj, min) \ 35 (LOCAL_GCC_VERSION >= (((maj) << 8) | (min))) 36 #else 37 # define LOCAL_GCC_VERSION 0 38 # define LOCAL_GCC_PREREQ(maj, min) 0 39 #endif 40 41 #if defined(__clang__) 42 # define LOCAL_CLANG_VERSION ((__clang_major__ << 8) | __clang_minor__) 43 # define LOCAL_CLANG_PREREQ(maj, min) \ 44 (LOCAL_CLANG_VERSION >= (((maj) << 8) | (min))) 45 #else 46 # define LOCAL_CLANG_VERSION 0 47 # define LOCAL_CLANG_PREREQ(maj, min) 0 48 #endif 49 50 #ifndef __has_builtin 51 # define __has_builtin(x) 0 52 #endif 53 54 // for now, none of the optimizations below are available in emscripten 55 #if !defined(EMSCRIPTEN) 56 57 #if defined(_MSC_VER) && _MSC_VER > 1310 && \ 58 (defined(_M_X64) || defined(_M_IX86)) 59 #define WEBP_MSC_SSE2 // Visual C++ SSE2 targets 60 #endif 61 62 #if defined(_MSC_VER) && _MSC_VER >= 1500 && \ 63 (defined(_M_X64) || defined(_M_IX86)) 64 #define WEBP_MSC_SSE41 // Visual C++ SSE4.1 targets 65 #endif 66 67 // WEBP_HAVE_* are used to indicate the presence of the instruction set in dsp 68 // files without intrinsics, allowing the corresponding Init() to be called. 69 // Files containing intrinsics will need to be built targeting the instruction 70 // set so should succeed on one of the earlier tests. 71 #if defined(__SSE2__) || defined(WEBP_MSC_SSE2) || defined(WEBP_HAVE_SSE2) 72 #define WEBP_USE_SSE2 73 #endif 74 75 #if defined(__SSE4_1__) || defined(WEBP_MSC_SSE41) || defined(WEBP_HAVE_SSE41) 76 #define WEBP_USE_SSE41 77 #endif 78 79 // The intrinsics currently cause compiler errors with arm-nacl-gcc and the 80 // inline assembly would need to be modified for use with Native Client. 81 #if (defined(__ARM_NEON__) || \ 82 defined(__aarch64__) || defined(WEBP_HAVE_NEON)) && \ 83 !defined(__native_client__) 84 #define WEBP_USE_NEON 85 #endif 86 87 #if !defined(WEBP_USE_NEON) && defined(__ANDROID__) && \ 88 defined(__ARM_ARCH_7A__) && defined(HAVE_CPU_FEATURES_H) 89 #define WEBP_ANDROID_NEON // Android targets that may have NEON 90 #define WEBP_USE_NEON 91 #endif 92 93 #if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_M_ARM) 94 #define WEBP_USE_NEON 95 #define WEBP_USE_INTRINSICS 96 #endif 97 98 #if defined(__mips__) && !defined(__mips64) && \ 99 defined(__mips_isa_rev) && (__mips_isa_rev >= 1) && (__mips_isa_rev < 6) 100 #define WEBP_USE_MIPS32 101 #if (__mips_isa_rev >= 2) 102 #define WEBP_USE_MIPS32_R2 103 #if defined(__mips_dspr2) || (defined(__mips_dsp_rev) && __mips_dsp_rev >= 2) 104 #define WEBP_USE_MIPS_DSP_R2 105 #endif 106 #endif 107 #endif 108 109 #if defined(__mips_msa) && defined(__mips_isa_rev) && (__mips_isa_rev >= 5) 110 #define WEBP_USE_MSA 111 #endif 112 113 #endif /* EMSCRIPTEN */ 114 115 #ifndef WEBP_DSP_OMIT_C_CODE 116 #define WEBP_DSP_OMIT_C_CODE 1 117 #endif 118 119 #if (defined(__aarch64__) || defined(__ARM_NEON__)) && WEBP_DSP_OMIT_C_CODE 120 #define WEBP_NEON_OMIT_C_CODE 1 121 #else 122 #define WEBP_NEON_OMIT_C_CODE 0 123 #endif 124 125 #if !(LOCAL_CLANG_PREREQ(3,8) || LOCAL_GCC_PREREQ(4,8) || defined(__aarch64__)) 126 #define WEBP_NEON_WORK_AROUND_GCC 1 127 #else 128 #define WEBP_NEON_WORK_AROUND_GCC 0 129 #endif 130 131 // This macro prevents thread_sanitizer from reporting known concurrent writes. 132 #define WEBP_TSAN_IGNORE_FUNCTION 133 #if defined(__has_feature) 134 #if __has_feature(thread_sanitizer) 135 #undef WEBP_TSAN_IGNORE_FUNCTION 136 #define WEBP_TSAN_IGNORE_FUNCTION __attribute__((no_sanitize_thread)) 137 #endif 138 #endif 139 140 #if defined(WEBP_USE_THREAD) && !defined(_WIN32) 141 #include <pthread.h> // NOLINT 142 143 #define WEBP_DSP_INIT(func) do { \ 144 static volatile VP8CPUInfo func ## _last_cpuinfo_used = \ 145 (VP8CPUInfo)&func ## _last_cpuinfo_used; \ 146 static pthread_mutex_t func ## _lock = PTHREAD_MUTEX_INITIALIZER; \ 147 if (pthread_mutex_lock(&func ## _lock)) break; \ 148 if (func ## _last_cpuinfo_used != VP8GetCPUInfo) func(); \ 149 func ## _last_cpuinfo_used = VP8GetCPUInfo; \ 150 (void)pthread_mutex_unlock(&func ## _lock); \ 151 } while (0) 152 #else // !(defined(WEBP_USE_THREAD) && !defined(_WIN32)) 153 #define WEBP_DSP_INIT(func) do { \ 154 static volatile VP8CPUInfo func ## _last_cpuinfo_used = \ 155 (VP8CPUInfo)&func ## _last_cpuinfo_used; \ 156 if (func ## _last_cpuinfo_used == VP8GetCPUInfo) break; \ 157 func(); \ 158 func ## _last_cpuinfo_used = VP8GetCPUInfo; \ 159 } while (0) 160 #endif // defined(WEBP_USE_THREAD) && !defined(_WIN32) 161 162 // Defines an Init + helper function that control multiple initialization of 163 // function pointers / tables. 164 /* Usage: 165 WEBP_DSP_INIT_FUNC(InitFunc) { 166 ...function body 167 } 168 */ 169 #define WEBP_DSP_INIT_FUNC(name) \ 170 static WEBP_TSAN_IGNORE_FUNCTION void name ## _body(void); \ 171 WEBP_TSAN_IGNORE_FUNCTION void name(void) { \ 172 WEBP_DSP_INIT(name ## _body); \ 173 } \ 174 static WEBP_TSAN_IGNORE_FUNCTION void name ## _body(void) 175 176 #define WEBP_UBSAN_IGNORE_UNDEF 177 #define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW 178 #if defined(__clang__) && defined(__has_attribute) 179 #if __has_attribute(no_sanitize) 180 // This macro prevents the undefined behavior sanitizer from reporting 181 // failures. This is only meant to silence unaligned loads on platforms that 182 // are known to support them. 183 #undef WEBP_UBSAN_IGNORE_UNDEF 184 #define WEBP_UBSAN_IGNORE_UNDEF \ 185 __attribute__((no_sanitize("undefined"))) 186 187 // This macro prevents the undefined behavior sanitizer from reporting 188 // failures related to unsigned integer overflows. This is only meant to 189 // silence cases where this well defined behavior is expected. 190 #undef WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW 191 #define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW \ 192 __attribute__((no_sanitize("unsigned-integer-overflow"))) 193 #endif 194 #endif 195 196 // Regularize the definition of WEBP_SWAP_16BIT_CSP (backward compatibility) 197 #if !defined(WEBP_SWAP_16BIT_CSP) 198 #define WEBP_SWAP_16BIT_CSP 0 199 #endif 200 201 // some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__) 202 #if !defined(WORDS_BIGENDIAN) && \ 203 (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \ 204 (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))) 205 #define WORDS_BIGENDIAN 206 #endif 207 208 typedef enum { 209 kSSE2, 210 kSSE3, 211 kSlowSSSE3, // special feature for slow SSSE3 architectures 212 kSSE4_1, 213 kAVX, 214 kAVX2, 215 kNEON, 216 kMIPS32, 217 kMIPSdspR2, 218 kMSA 219 } CPUFeature; 220 // returns true if the CPU supports the feature. 221 typedef int (*VP8CPUInfo)(CPUFeature feature); 222 WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo; 223 224 //------------------------------------------------------------------------------ 225 // Init stub generator 226 227 // Defines an init function stub to ensure each module exposes a symbol, 228 // avoiding a compiler warning. 229 #define WEBP_DSP_INIT_STUB(func) \ 230 extern void func(void); \ 231 void func(void) {} 232 233 //------------------------------------------------------------------------------ 234 // Encoding 235 236 // Transforms 237 // VP8Idct: Does one of two inverse transforms. If do_two is set, the transforms 238 // will be done for (ref, in, dst) and (ref + 4, in + 16, dst + 4). 239 typedef void (*VP8Idct)(const uint8_t* ref, const int16_t* in, uint8_t* dst, 240 int do_two); 241 typedef void (*VP8Fdct)(const uint8_t* src, const uint8_t* ref, int16_t* out); 242 typedef void (*VP8WHT)(const int16_t* in, int16_t* out); 243 extern VP8Idct VP8ITransform; 244 extern VP8Fdct VP8FTransform; 245 extern VP8Fdct VP8FTransform2; // performs two transforms at a time 246 extern VP8WHT VP8FTransformWHT; 247 // Predictions 248 // *dst is the destination block. *top and *left can be NULL. 249 typedef void (*VP8IntraPreds)(uint8_t* dst, const uint8_t* left, 250 const uint8_t* top); 251 typedef void (*VP8Intra4Preds)(uint8_t* dst, const uint8_t* top); 252 extern VP8Intra4Preds VP8EncPredLuma4; 253 extern VP8IntraPreds VP8EncPredLuma16; 254 extern VP8IntraPreds VP8EncPredChroma8; 255 256 typedef int (*VP8Metric)(const uint8_t* pix, const uint8_t* ref); 257 extern VP8Metric VP8SSE16x16, VP8SSE16x8, VP8SSE8x8, VP8SSE4x4; 258 typedef int (*VP8WMetric)(const uint8_t* pix, const uint8_t* ref, 259 const uint16_t* const weights); 260 // The weights for VP8TDisto4x4 and VP8TDisto16x16 contain a row-major 261 // 4 by 4 symmetric matrix. 262 extern VP8WMetric VP8TDisto4x4, VP8TDisto16x16; 263 264 // Compute the average (DC) of four 4x4 blocks. 265 // Each sub-4x4 block #i sum is stored in dc[i]. 266 typedef void (*VP8MeanMetric)(const uint8_t* ref, uint32_t dc[4]); 267 extern VP8MeanMetric VP8Mean16x4; 268 269 typedef void (*VP8BlockCopy)(const uint8_t* src, uint8_t* dst); 270 extern VP8BlockCopy VP8Copy4x4; 271 extern VP8BlockCopy VP8Copy16x8; 272 // Quantization 273 struct VP8Matrix; // forward declaration 274 typedef int (*VP8QuantizeBlock)(int16_t in[16], int16_t out[16], 275 const struct VP8Matrix* const mtx); 276 // Same as VP8QuantizeBlock, but quantizes two consecutive blocks. 277 typedef int (*VP8Quantize2Blocks)(int16_t in[32], int16_t out[32], 278 const struct VP8Matrix* const mtx); 279 280 extern VP8QuantizeBlock VP8EncQuantizeBlock; 281 extern VP8Quantize2Blocks VP8EncQuantize2Blocks; 282 283 // specific to 2nd transform: 284 typedef int (*VP8QuantizeBlockWHT)(int16_t in[16], int16_t out[16], 285 const struct VP8Matrix* const mtx); 286 extern VP8QuantizeBlockWHT VP8EncQuantizeBlockWHT; 287 288 extern const int VP8DspScan[16 + 4 + 4]; 289 290 // Collect histogram for susceptibility calculation. 291 #define MAX_COEFF_THRESH 31 // size of histogram used by CollectHistogram. 292 typedef struct { 293 // We only need to store max_value and last_non_zero, not the distribution. 294 int max_value; 295 int last_non_zero; 296 } VP8Histogram; 297 typedef void (*VP8CHisto)(const uint8_t* ref, const uint8_t* pred, 298 int start_block, int end_block, 299 VP8Histogram* const histo); 300 extern VP8CHisto VP8CollectHistogram; 301 // General-purpose util function to help VP8CollectHistogram(). 302 void VP8SetHistogramData(const int distribution[MAX_COEFF_THRESH + 1], 303 VP8Histogram* const histo); 304 305 // must be called before using any of the above 306 void VP8EncDspInit(void); 307 308 //------------------------------------------------------------------------------ 309 // cost functions (encoding) 310 311 extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) 312 // approximate cost per level: 313 extern const uint16_t VP8LevelFixedCosts[2047 /*MAX_LEVEL*/ + 1]; 314 extern const uint8_t VP8EncBands[16 + 1]; 315 316 struct VP8Residual; 317 typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs, 318 struct VP8Residual* const res); 319 extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs; 320 321 // Cost calculation function. 322 typedef int (*VP8GetResidualCostFunc)(int ctx0, 323 const struct VP8Residual* const res); 324 extern VP8GetResidualCostFunc VP8GetResidualCost; 325 326 // must be called before anything using the above 327 void VP8EncDspCostInit(void); 328 329 //------------------------------------------------------------------------------ 330 // SSIM / PSNR utils 331 332 // struct for accumulating statistical moments 333 typedef struct { 334 uint32_t w; // sum(w_i) : sum of weights 335 uint32_t xm, ym; // sum(w_i * x_i), sum(w_i * y_i) 336 uint32_t xxm, xym, yym; // sum(w_i * x_i * x_i), etc. 337 } VP8DistoStats; 338 339 // Compute the final SSIM value 340 // The non-clipped version assumes stats->w = (2 * VP8_SSIM_KERNEL + 1)^2. 341 double VP8SSIMFromStats(const VP8DistoStats* const stats); 342 double VP8SSIMFromStatsClipped(const VP8DistoStats* const stats); 343 344 #define VP8_SSIM_KERNEL 3 // total size of the kernel: 2 * VP8_SSIM_KERNEL + 1 345 typedef double (*VP8SSIMGetClippedFunc)(const uint8_t* src1, int stride1, 346 const uint8_t* src2, int stride2, 347 int xo, int yo, // center position 348 int W, int H); // plane dimension 349 350 #if !defined(WEBP_REDUCE_SIZE) 351 // This version is called with the guarantee that you can load 8 bytes and 352 // 8 rows at offset src1 and src2 353 typedef double (*VP8SSIMGetFunc)(const uint8_t* src1, int stride1, 354 const uint8_t* src2, int stride2); 355 356 extern VP8SSIMGetFunc VP8SSIMGet; // unclipped / unchecked 357 extern VP8SSIMGetClippedFunc VP8SSIMGetClipped; // with clipping 358 #endif 359 360 #if !defined(WEBP_DISABLE_STATS) 361 typedef uint32_t (*VP8AccumulateSSEFunc)(const uint8_t* src1, 362 const uint8_t* src2, int len); 363 extern VP8AccumulateSSEFunc VP8AccumulateSSE; 364 #endif 365 366 // must be called before using any of the above directly 367 void VP8SSIMDspInit(void); 368 369 //------------------------------------------------------------------------------ 370 // Decoding 371 372 typedef void (*VP8DecIdct)(const int16_t* coeffs, uint8_t* dst); 373 // when doing two transforms, coeffs is actually int16_t[2][16]. 374 typedef void (*VP8DecIdct2)(const int16_t* coeffs, uint8_t* dst, int do_two); 375 extern VP8DecIdct2 VP8Transform; 376 extern VP8DecIdct VP8TransformAC3; 377 extern VP8DecIdct VP8TransformUV; 378 extern VP8DecIdct VP8TransformDC; 379 extern VP8DecIdct VP8TransformDCUV; 380 extern VP8WHT VP8TransformWHT; 381 382 // *dst is the destination block, with stride BPS. Boundary samples are 383 // assumed accessible when needed. 384 typedef void (*VP8PredFunc)(uint8_t* dst); 385 extern VP8PredFunc VP8PredLuma16[/* NUM_B_DC_MODES */]; 386 extern VP8PredFunc VP8PredChroma8[/* NUM_B_DC_MODES */]; 387 extern VP8PredFunc VP8PredLuma4[/* NUM_BMODES */]; 388 389 // clipping tables (for filtering) 390 extern const int8_t* const VP8ksclip1; // clips [-1020, 1020] to [-128, 127] 391 extern const int8_t* const VP8ksclip2; // clips [-112, 112] to [-16, 15] 392 extern const uint8_t* const VP8kclip1; // clips [-255,511] to [0,255] 393 extern const uint8_t* const VP8kabs0; // abs(x) for x in [-255,255] 394 // must be called first 395 void VP8InitClipTables(void); 396 397 // simple filter (only for luma) 398 typedef void (*VP8SimpleFilterFunc)(uint8_t* p, int stride, int thresh); 399 extern VP8SimpleFilterFunc VP8SimpleVFilter16; 400 extern VP8SimpleFilterFunc VP8SimpleHFilter16; 401 extern VP8SimpleFilterFunc VP8SimpleVFilter16i; // filter 3 inner edges 402 extern VP8SimpleFilterFunc VP8SimpleHFilter16i; 403 404 // regular filter (on both macroblock edges and inner edges) 405 typedef void (*VP8LumaFilterFunc)(uint8_t* luma, int stride, 406 int thresh, int ithresh, int hev_t); 407 typedef void (*VP8ChromaFilterFunc)(uint8_t* u, uint8_t* v, int stride, 408 int thresh, int ithresh, int hev_t); 409 // on outer edge 410 extern VP8LumaFilterFunc VP8VFilter16; 411 extern VP8LumaFilterFunc VP8HFilter16; 412 extern VP8ChromaFilterFunc VP8VFilter8; 413 extern VP8ChromaFilterFunc VP8HFilter8; 414 415 // on inner edge 416 extern VP8LumaFilterFunc VP8VFilter16i; // filtering 3 inner edges altogether 417 extern VP8LumaFilterFunc VP8HFilter16i; 418 extern VP8ChromaFilterFunc VP8VFilter8i; // filtering u and v altogether 419 extern VP8ChromaFilterFunc VP8HFilter8i; 420 421 // Dithering. Combines dithering values (centered around 128) with dst[], 422 // according to: dst[] = clip(dst[] + (((dither[]-128) + 8) >> 4) 423 #define VP8_DITHER_DESCALE 4 424 #define VP8_DITHER_DESCALE_ROUNDER (1 << (VP8_DITHER_DESCALE - 1)) 425 #define VP8_DITHER_AMP_BITS 7 426 #define VP8_DITHER_AMP_CENTER (1 << VP8_DITHER_AMP_BITS) 427 extern void (*VP8DitherCombine8x8)(const uint8_t* dither, uint8_t* dst, 428 int dst_stride); 429 430 // must be called before anything using the above 431 void VP8DspInit(void); 432 433 //------------------------------------------------------------------------------ 434 // WebP I/O 435 436 #define FANCY_UPSAMPLING // undefined to remove fancy upsampling support 437 438 // Convert a pair of y/u/v lines together to the output rgb/a colorspace. 439 // bottom_y can be NULL if only one line of output is needed (at top/bottom). 440 typedef void (*WebPUpsampleLinePairFunc)( 441 const uint8_t* top_y, const uint8_t* bottom_y, 442 const uint8_t* top_u, const uint8_t* top_v, 443 const uint8_t* cur_u, const uint8_t* cur_v, 444 uint8_t* top_dst, uint8_t* bottom_dst, int len); 445 446 #ifdef FANCY_UPSAMPLING 447 448 // Fancy upsampling functions to convert YUV to RGB(A) modes 449 extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */]; 450 451 #endif // FANCY_UPSAMPLING 452 453 // Per-row point-sampling methods. 454 typedef void (*WebPSamplerRowFunc)(const uint8_t* y, 455 const uint8_t* u, const uint8_t* v, 456 uint8_t* dst, int len); 457 // Generic function to apply 'WebPSamplerRowFunc' to the whole plane: 458 void WebPSamplerProcessPlane(const uint8_t* y, int y_stride, 459 const uint8_t* u, const uint8_t* v, int uv_stride, 460 uint8_t* dst, int dst_stride, 461 int width, int height, WebPSamplerRowFunc func); 462 463 // Sampling functions to convert rows of YUV to RGB(A) 464 extern WebPSamplerRowFunc WebPSamplers[/* MODE_LAST */]; 465 466 // General function for converting two lines of ARGB or RGBA. 467 // 'alpha_is_last' should be true if 0xff000000 is stored in memory as 468 // as 0x00, 0x00, 0x00, 0xff (little endian). 469 WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last); 470 471 // YUV444->RGB converters 472 typedef void (*WebPYUV444Converter)(const uint8_t* y, 473 const uint8_t* u, const uint8_t* v, 474 uint8_t* dst, int len); 475 476 extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */]; 477 478 // Must be called before using the WebPUpsamplers[] (and for premultiplied 479 // colorspaces like rgbA, rgbA4444, etc) 480 void WebPInitUpsamplers(void); 481 // Must be called before using WebPSamplers[] 482 void WebPInitSamplers(void); 483 // Must be called before using WebPYUV444Converters[] 484 void WebPInitYUV444Converters(void); 485 486 //------------------------------------------------------------------------------ 487 // ARGB -> YUV converters 488 489 // Convert ARGB samples to luma Y. 490 extern void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width); 491 // Convert ARGB samples to U/V with downsampling. do_store should be '1' for 492 // even lines and '0' for odd ones. 'src_width' is the original width, not 493 // the U/V one. 494 extern void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v, 495 int src_width, int do_store); 496 497 // Convert a row of accumulated (four-values) of rgba32 toward U/V 498 extern void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb, 499 uint8_t* u, uint8_t* v, int width); 500 501 // Convert RGB or BGR to Y 502 extern void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width); 503 extern void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width); 504 505 // used for plain-C fallback. 506 extern void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v, 507 int src_width, int do_store); 508 extern void WebPConvertRGBA32ToUV_C(const uint16_t* rgb, 509 uint8_t* u, uint8_t* v, int width); 510 511 // utilities for accurate RGB->YUV conversion 512 extern uint64_t (*WebPSharpYUVUpdateY)(const uint16_t* src, const uint16_t* ref, 513 uint16_t* dst, int len); 514 extern void (*WebPSharpYUVUpdateRGB)(const int16_t* src, const int16_t* ref, 515 int16_t* dst, int len); 516 extern void (*WebPSharpYUVFilterRow)(const int16_t* A, const int16_t* B, 517 int len, 518 const uint16_t* best_y, uint16_t* out); 519 520 // Must be called before using the above. 521 void WebPInitConvertARGBToYUV(void); 522 523 //------------------------------------------------------------------------------ 524 // Rescaler 525 526 struct WebPRescaler; 527 528 // Import a row of data and save its contribution in the rescaler. 529 // 'channel' denotes the channel number to be imported. 'Expand' corresponds to 530 // the wrk->x_expand case. Otherwise, 'Shrink' is to be used. 531 typedef void (*WebPRescalerImportRowFunc)(struct WebPRescaler* const wrk, 532 const uint8_t* src); 533 534 extern WebPRescalerImportRowFunc WebPRescalerImportRowExpand; 535 extern WebPRescalerImportRowFunc WebPRescalerImportRowShrink; 536 537 // Export one row (starting at x_out position) from rescaler. 538 // 'Expand' corresponds to the wrk->y_expand case. 539 // Otherwise 'Shrink' is to be used 540 typedef void (*WebPRescalerExportRowFunc)(struct WebPRescaler* const wrk); 541 extern WebPRescalerExportRowFunc WebPRescalerExportRowExpand; 542 extern WebPRescalerExportRowFunc WebPRescalerExportRowShrink; 543 544 // Plain-C implementation, as fall-back. 545 extern void WebPRescalerImportRowExpand_C(struct WebPRescaler* const wrk, 546 const uint8_t* src); 547 extern void WebPRescalerImportRowShrink_C(struct WebPRescaler* const wrk, 548 const uint8_t* src); 549 extern void WebPRescalerExportRowExpand_C(struct WebPRescaler* const wrk); 550 extern void WebPRescalerExportRowShrink_C(struct WebPRescaler* const wrk); 551 552 // Main entry calls: 553 extern void WebPRescalerImportRow(struct WebPRescaler* const wrk, 554 const uint8_t* src); 555 // Export one row (starting at x_out position) from rescaler. 556 extern void WebPRescalerExportRow(struct WebPRescaler* const wrk); 557 558 // Must be called first before using the above. 559 void WebPRescalerDspInit(void); 560 561 //------------------------------------------------------------------------------ 562 // Utilities for processing transparent channel. 563 564 // Apply alpha pre-multiply on an rgba, bgra or argb plane of size w * h. 565 // alpha_first should be 0 for argb, 1 for rgba or bgra (where alpha is last). 566 extern void (*WebPApplyAlphaMultiply)( 567 uint8_t* rgba, int alpha_first, int w, int h, int stride); 568 569 // Same, buf specifically for RGBA4444 format 570 extern void (*WebPApplyAlphaMultiply4444)( 571 uint8_t* rgba4444, int w, int h, int stride); 572 573 // Dispatch the values from alpha[] plane to the ARGB destination 'dst'. 574 // Returns true if alpha[] plane has non-trivial values different from 0xff. 575 extern int (*WebPDispatchAlpha)(const uint8_t* alpha, int alpha_stride, 576 int width, int height, 577 uint8_t* dst, int dst_stride); 578 579 // Transfer packed 8b alpha[] values to green channel in dst[], zero'ing the 580 // A/R/B values. 'dst_stride' is the stride for dst[] in uint32_t units. 581 extern void (*WebPDispatchAlphaToGreen)(const uint8_t* alpha, int alpha_stride, 582 int width, int height, 583 uint32_t* dst, int dst_stride); 584 585 // Extract the alpha values from 32b values in argb[] and pack them into alpha[] 586 // (this is the opposite of WebPDispatchAlpha). 587 // Returns true if there's only trivial 0xff alpha values. 588 extern int (*WebPExtractAlpha)(const uint8_t* argb, int argb_stride, 589 int width, int height, 590 uint8_t* alpha, int alpha_stride); 591 592 // Extract the green values from 32b values in argb[] and pack them into alpha[] 593 // (this is the opposite of WebPDispatchAlphaToGreen). 594 extern void (*WebPExtractGreen)(const uint32_t* argb, uint8_t* alpha, int size); 595 596 // Pre-Multiply operation transforms x into x * A / 255 (where x=Y,R,G or B). 597 // Un-Multiply operation transforms x into x * 255 / A. 598 599 // Pre-Multiply or Un-Multiply (if 'inverse' is true) argb values in a row. 600 extern void (*WebPMultARGBRow)(uint32_t* const ptr, int width, int inverse); 601 602 // Same a WebPMultARGBRow(), but for several rows. 603 void WebPMultARGBRows(uint8_t* ptr, int stride, int width, int num_rows, 604 int inverse); 605 606 // Same for a row of single values, with side alpha values. 607 extern void (*WebPMultRow)(uint8_t* const ptr, const uint8_t* const alpha, 608 int width, int inverse); 609 610 // Same a WebPMultRow(), but for several 'num_rows' rows. 611 void WebPMultRows(uint8_t* ptr, int stride, 612 const uint8_t* alpha, int alpha_stride, 613 int width, int num_rows, int inverse); 614 615 // Plain-C versions, used as fallback by some implementations. 616 void WebPMultRow_C(uint8_t* const ptr, const uint8_t* const alpha, 617 int width, int inverse); 618 void WebPMultARGBRow_C(uint32_t* const ptr, int width, int inverse); 619 620 #ifdef WORDS_BIGENDIAN 621 // ARGB packing function: a/r/g/b input is rgba or bgra order. 622 extern void (*WebPPackARGB)(const uint8_t* a, const uint8_t* r, 623 const uint8_t* g, const uint8_t* b, int len, 624 uint32_t* out); 625 #endif 626 627 // RGB packing function. 'step' can be 3 or 4. r/g/b input is rgb or bgr order. 628 extern void (*WebPPackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b, 629 int len, int step, uint32_t* out); 630 631 // This function returns true if src[i] contains a value different from 0xff. 632 extern int (*WebPHasAlpha8b)(const uint8_t* src, int length); 633 // This function returns true if src[4*i] contains a value different from 0xff. 634 extern int (*WebPHasAlpha32b)(const uint8_t* src, int length); 635 636 // To be called first before using the above. 637 void WebPInitAlphaProcessing(void); 638 639 //------------------------------------------------------------------------------ 640 // Filter functions 641 642 typedef enum { // Filter types. 643 WEBP_FILTER_NONE = 0, 644 WEBP_FILTER_HORIZONTAL, 645 WEBP_FILTER_VERTICAL, 646 WEBP_FILTER_GRADIENT, 647 WEBP_FILTER_LAST = WEBP_FILTER_GRADIENT + 1, // end marker 648 WEBP_FILTER_BEST, // meta-types 649 WEBP_FILTER_FAST 650 } WEBP_FILTER_TYPE; 651 652 typedef void (*WebPFilterFunc)(const uint8_t* in, int width, int height, 653 int stride, uint8_t* out); 654 // In-place un-filtering. 655 // Warning! 'prev_line' pointer can be equal to 'cur_line' or 'preds'. 656 typedef void (*WebPUnfilterFunc)(const uint8_t* prev_line, const uint8_t* preds, 657 uint8_t* cur_line, int width); 658 659 // Filter the given data using the given predictor. 660 // 'in' corresponds to a 2-dimensional pixel array of size (stride * height) 661 // in raster order. 662 // 'stride' is number of bytes per scan line (with possible padding). 663 // 'out' should be pre-allocated. 664 extern WebPFilterFunc WebPFilters[WEBP_FILTER_LAST]; 665 666 // In-place reconstruct the original data from the given filtered data. 667 // The reconstruction will be done for 'num_rows' rows starting from 'row' 668 // (assuming rows upto 'row - 1' are already reconstructed). 669 extern WebPUnfilterFunc WebPUnfilters[WEBP_FILTER_LAST]; 670 671 // To be called first before using the above. 672 void VP8FiltersInit(void); 673 674 #ifdef __cplusplus 675 } // extern "C" 676 #endif 677 678 #endif // WEBP_DSP_DSP_H_ 679