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 #if defined(__AVX2__) || defined(WEBP_HAVE_AVX2) 80 #define WEBP_USE_AVX2 81 #endif 82 83 // The intrinsics currently cause compiler errors with arm-nacl-gcc and the 84 // inline assembly would need to be modified for use with Native Client. 85 #if (defined(__ARM_NEON__) || \ 86 defined(__aarch64__) || defined(WEBP_HAVE_NEON)) && \ 87 !defined(__native_client__) 88 #define WEBP_USE_NEON 89 #endif 90 91 #if !defined(WEBP_USE_NEON) && defined(__ANDROID__) && \ 92 defined(__ARM_ARCH_7A__) && defined(HAVE_CPU_FEATURES_H) 93 #define WEBP_ANDROID_NEON // Android targets that may have NEON 94 #define WEBP_USE_NEON 95 #endif 96 97 #if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_M_ARM) 98 #define WEBP_USE_NEON 99 #define WEBP_USE_INTRINSICS 100 #endif 101 102 #if defined(__mips__) && !defined(__mips64) && \ 103 defined(__mips_isa_rev) && (__mips_isa_rev >= 1) && (__mips_isa_rev < 6) 104 #define WEBP_USE_MIPS32 105 #if (__mips_isa_rev >= 2) 106 #define WEBP_USE_MIPS32_R2 107 #if defined(__mips_dspr2) || (defined(__mips_dsp_rev) && __mips_dsp_rev >= 2) 108 #define WEBP_USE_MIPS_DSP_R2 109 #endif 110 #endif 111 #endif 112 113 #if defined(__mips_msa) && defined(__mips_isa_rev) && (__mips_isa_rev >= 5) 114 #define WEBP_USE_MSA 115 #endif 116 117 #endif /* EMSCRIPTEN */ 118 119 #ifndef WEBP_DSP_OMIT_C_CODE 120 #define WEBP_DSP_OMIT_C_CODE 1 121 #endif 122 123 #if (defined(__aarch64__) || defined(__ARM_NEON__)) && WEBP_DSP_OMIT_C_CODE 124 #define WEBP_NEON_OMIT_C_CODE 1 125 #else 126 #define WEBP_NEON_OMIT_C_CODE 0 127 #endif 128 129 #if !(LOCAL_CLANG_PREREQ(3,8) || LOCAL_GCC_PREREQ(4,8) || defined(__aarch64__)) 130 #define WEBP_NEON_WORK_AROUND_GCC 1 131 #else 132 #define WEBP_NEON_WORK_AROUND_GCC 0 133 #endif 134 135 // This macro prevents thread_sanitizer from reporting known concurrent writes. 136 #define WEBP_TSAN_IGNORE_FUNCTION 137 #if defined(__has_feature) 138 #if __has_feature(thread_sanitizer) 139 #undef WEBP_TSAN_IGNORE_FUNCTION 140 #define WEBP_TSAN_IGNORE_FUNCTION __attribute__((no_sanitize_thread)) 141 #endif 142 #endif 143 144 #define WEBP_UBSAN_IGNORE_UNDEF 145 #define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW 146 #if defined(__clang__) && defined(__has_attribute) 147 #if __has_attribute(no_sanitize) 148 // This macro prevents the undefined behavior sanitizer from reporting 149 // failures. This is only meant to silence unaligned loads on platforms that 150 // are known to support them. 151 #undef WEBP_UBSAN_IGNORE_UNDEF 152 #define WEBP_UBSAN_IGNORE_UNDEF \ 153 __attribute__((no_sanitize("undefined"))) 154 155 // This macro prevents the undefined behavior sanitizer from reporting 156 // failures related to unsigned integer overflows. This is only meant to 157 // silence cases where this well defined behavior is expected. 158 #undef WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW 159 #define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW \ 160 __attribute__((no_sanitize("unsigned-integer-overflow"))) 161 #endif 162 #endif 163 164 // Regularize the definition of WEBP_SWAP_16BIT_CSP (backward compatibility) 165 #if !defined(WEBP_SWAP_16BIT_CSP) 166 #define WEBP_SWAP_16BIT_CSP 0 167 #endif 168 169 typedef enum { 170 kSSE2, 171 kSSE3, 172 kSlowSSSE3, // special feature for slow SSSE3 architectures 173 kSSE4_1, 174 kAVX, 175 kAVX2, 176 kNEON, 177 kMIPS32, 178 kMIPSdspR2, 179 kMSA 180 } CPUFeature; 181 // returns true if the CPU supports the feature. 182 typedef int (*VP8CPUInfo)(CPUFeature feature); 183 WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo; 184 185 //------------------------------------------------------------------------------ 186 // Init stub generator 187 188 // Defines an init function stub to ensure each module exposes a symbol, 189 // avoiding a compiler warning. 190 #define WEBP_DSP_INIT_STUB(func) \ 191 extern void func(void); \ 192 WEBP_TSAN_IGNORE_FUNCTION void func(void) {} 193 194 //------------------------------------------------------------------------------ 195 // Encoding 196 197 // Transforms 198 // VP8Idct: Does one of two inverse transforms. If do_two is set, the transforms 199 // will be done for (ref, in, dst) and (ref + 4, in + 16, dst + 4). 200 typedef void (*VP8Idct)(const uint8_t* ref, const int16_t* in, uint8_t* dst, 201 int do_two); 202 typedef void (*VP8Fdct)(const uint8_t* src, const uint8_t* ref, int16_t* out); 203 typedef void (*VP8WHT)(const int16_t* in, int16_t* out); 204 extern VP8Idct VP8ITransform; 205 extern VP8Fdct VP8FTransform; 206 extern VP8Fdct VP8FTransform2; // performs two transforms at a time 207 extern VP8WHT VP8FTransformWHT; 208 // Predictions 209 // *dst is the destination block. *top and *left can be NULL. 210 typedef void (*VP8IntraPreds)(uint8_t *dst, const uint8_t* left, 211 const uint8_t* top); 212 typedef void (*VP8Intra4Preds)(uint8_t *dst, const uint8_t* top); 213 extern VP8Intra4Preds VP8EncPredLuma4; 214 extern VP8IntraPreds VP8EncPredLuma16; 215 extern VP8IntraPreds VP8EncPredChroma8; 216 217 typedef int (*VP8Metric)(const uint8_t* pix, const uint8_t* ref); 218 extern VP8Metric VP8SSE16x16, VP8SSE16x8, VP8SSE8x8, VP8SSE4x4; 219 typedef int (*VP8WMetric)(const uint8_t* pix, const uint8_t* ref, 220 const uint16_t* const weights); 221 // The weights for VP8TDisto4x4 and VP8TDisto16x16 contain a row-major 222 // 4 by 4 symmetric matrix. 223 extern VP8WMetric VP8TDisto4x4, VP8TDisto16x16; 224 225 // Compute the average (DC) of four 4x4 blocks. 226 // Each sub-4x4 block #i sum is stored in dc[i]. 227 typedef void (*VP8MeanMetric)(const uint8_t* ref, uint32_t dc[4]); 228 extern VP8MeanMetric VP8Mean16x4; 229 230 typedef void (*VP8BlockCopy)(const uint8_t* src, uint8_t* dst); 231 extern VP8BlockCopy VP8Copy4x4; 232 extern VP8BlockCopy VP8Copy16x8; 233 // Quantization 234 struct VP8Matrix; // forward declaration 235 typedef int (*VP8QuantizeBlock)(int16_t in[16], int16_t out[16], 236 const struct VP8Matrix* const mtx); 237 // Same as VP8QuantizeBlock, but quantizes two consecutive blocks. 238 typedef int (*VP8Quantize2Blocks)(int16_t in[32], int16_t out[32], 239 const struct VP8Matrix* const mtx); 240 241 extern VP8QuantizeBlock VP8EncQuantizeBlock; 242 extern VP8Quantize2Blocks VP8EncQuantize2Blocks; 243 244 // specific to 2nd transform: 245 typedef int (*VP8QuantizeBlockWHT)(int16_t in[16], int16_t out[16], 246 const struct VP8Matrix* const mtx); 247 extern VP8QuantizeBlockWHT VP8EncQuantizeBlockWHT; 248 249 extern const int VP8DspScan[16 + 4 + 4]; 250 251 // Collect histogram for susceptibility calculation. 252 #define MAX_COEFF_THRESH 31 // size of histogram used by CollectHistogram. 253 typedef struct { 254 // We only need to store max_value and last_non_zero, not the distribution. 255 int max_value; 256 int last_non_zero; 257 } VP8Histogram; 258 typedef void (*VP8CHisto)(const uint8_t* ref, const uint8_t* pred, 259 int start_block, int end_block, 260 VP8Histogram* const histo); 261 extern VP8CHisto VP8CollectHistogram; 262 // General-purpose util function to help VP8CollectHistogram(). 263 void VP8SetHistogramData(const int distribution[MAX_COEFF_THRESH + 1], 264 VP8Histogram* const histo); 265 266 // must be called before using any of the above 267 void VP8EncDspInit(void); 268 269 //------------------------------------------------------------------------------ 270 // cost functions (encoding) 271 272 extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) 273 // approximate cost per level: 274 extern const uint16_t VP8LevelFixedCosts[2047 /*MAX_LEVEL*/ + 1]; 275 extern const uint8_t VP8EncBands[16 + 1]; 276 277 struct VP8Residual; 278 typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs, 279 struct VP8Residual* const res); 280 extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs; 281 282 // Cost calculation function. 283 typedef int (*VP8GetResidualCostFunc)(int ctx0, 284 const struct VP8Residual* const res); 285 extern VP8GetResidualCostFunc VP8GetResidualCost; 286 287 // must be called before anything using the above 288 void VP8EncDspCostInit(void); 289 290 //------------------------------------------------------------------------------ 291 // SSIM / PSNR utils 292 293 // struct for accumulating statistical moments 294 typedef struct { 295 uint32_t w; // sum(w_i) : sum of weights 296 uint32_t xm, ym; // sum(w_i * x_i), sum(w_i * y_i) 297 uint32_t xxm, xym, yym; // sum(w_i * x_i * x_i), etc. 298 } VP8DistoStats; 299 300 // Compute the final SSIM value 301 // The non-clipped version assumes stats->w = (2 * VP8_SSIM_KERNEL + 1)^2. 302 double VP8SSIMFromStats(const VP8DistoStats* const stats); 303 double VP8SSIMFromStatsClipped(const VP8DistoStats* const stats); 304 305 #define VP8_SSIM_KERNEL 3 // total size of the kernel: 2 * VP8_SSIM_KERNEL + 1 306 typedef double (*VP8SSIMGetClippedFunc)(const uint8_t* src1, int stride1, 307 const uint8_t* src2, int stride2, 308 int xo, int yo, // center position 309 int W, int H); // plane dimension 310 311 #if !defined(WEBP_REDUCE_SIZE) 312 // This version is called with the guarantee that you can load 8 bytes and 313 // 8 rows at offset src1 and src2 314 typedef double (*VP8SSIMGetFunc)(const uint8_t* src1, int stride1, 315 const uint8_t* src2, int stride2); 316 317 extern VP8SSIMGetFunc VP8SSIMGet; // unclipped / unchecked 318 extern VP8SSIMGetClippedFunc VP8SSIMGetClipped; // with clipping 319 #endif 320 321 #if !defined(WEBP_DISABLE_STATS) 322 typedef uint32_t (*VP8AccumulateSSEFunc)(const uint8_t* src1, 323 const uint8_t* src2, int len); 324 extern VP8AccumulateSSEFunc VP8AccumulateSSE; 325 #endif 326 327 // must be called before using any of the above directly 328 void VP8SSIMDspInit(void); 329 330 //------------------------------------------------------------------------------ 331 // Decoding 332 333 typedef void (*VP8DecIdct)(const int16_t* coeffs, uint8_t* dst); 334 // when doing two transforms, coeffs is actually int16_t[2][16]. 335 typedef void (*VP8DecIdct2)(const int16_t* coeffs, uint8_t* dst, int do_two); 336 extern VP8DecIdct2 VP8Transform; 337 extern VP8DecIdct VP8TransformAC3; 338 extern VP8DecIdct VP8TransformUV; 339 extern VP8DecIdct VP8TransformDC; 340 extern VP8DecIdct VP8TransformDCUV; 341 extern VP8WHT VP8TransformWHT; 342 343 // *dst is the destination block, with stride BPS. Boundary samples are 344 // assumed accessible when needed. 345 typedef void (*VP8PredFunc)(uint8_t* dst); 346 extern VP8PredFunc VP8PredLuma16[/* NUM_B_DC_MODES */]; 347 extern VP8PredFunc VP8PredChroma8[/* NUM_B_DC_MODES */]; 348 extern VP8PredFunc VP8PredLuma4[/* NUM_BMODES */]; 349 350 // clipping tables (for filtering) 351 extern const int8_t* const VP8ksclip1; // clips [-1020, 1020] to [-128, 127] 352 extern const int8_t* const VP8ksclip2; // clips [-112, 112] to [-16, 15] 353 extern const uint8_t* const VP8kclip1; // clips [-255,511] to [0,255] 354 extern const uint8_t* const VP8kabs0; // abs(x) for x in [-255,255] 355 // must be called first 356 void VP8InitClipTables(void); 357 358 // simple filter (only for luma) 359 typedef void (*VP8SimpleFilterFunc)(uint8_t* p, int stride, int thresh); 360 extern VP8SimpleFilterFunc VP8SimpleVFilter16; 361 extern VP8SimpleFilterFunc VP8SimpleHFilter16; 362 extern VP8SimpleFilterFunc VP8SimpleVFilter16i; // filter 3 inner edges 363 extern VP8SimpleFilterFunc VP8SimpleHFilter16i; 364 365 // regular filter (on both macroblock edges and inner edges) 366 typedef void (*VP8LumaFilterFunc)(uint8_t* luma, int stride, 367 int thresh, int ithresh, int hev_t); 368 typedef void (*VP8ChromaFilterFunc)(uint8_t* u, uint8_t* v, int stride, 369 int thresh, int ithresh, int hev_t); 370 // on outer edge 371 extern VP8LumaFilterFunc VP8VFilter16; 372 extern VP8LumaFilterFunc VP8HFilter16; 373 extern VP8ChromaFilterFunc VP8VFilter8; 374 extern VP8ChromaFilterFunc VP8HFilter8; 375 376 // on inner edge 377 extern VP8LumaFilterFunc VP8VFilter16i; // filtering 3 inner edges altogether 378 extern VP8LumaFilterFunc VP8HFilter16i; 379 extern VP8ChromaFilterFunc VP8VFilter8i; // filtering u and v altogether 380 extern VP8ChromaFilterFunc VP8HFilter8i; 381 382 // Dithering. Combines dithering values (centered around 128) with dst[], 383 // according to: dst[] = clip(dst[] + (((dither[]-128) + 8) >> 4) 384 #define VP8_DITHER_DESCALE 4 385 #define VP8_DITHER_DESCALE_ROUNDER (1 << (VP8_DITHER_DESCALE - 1)) 386 #define VP8_DITHER_AMP_BITS 7 387 #define VP8_DITHER_AMP_CENTER (1 << VP8_DITHER_AMP_BITS) 388 extern void (*VP8DitherCombine8x8)(const uint8_t* dither, uint8_t* dst, 389 int dst_stride); 390 391 // must be called before anything using the above 392 void VP8DspInit(void); 393 394 //------------------------------------------------------------------------------ 395 // WebP I/O 396 397 #define FANCY_UPSAMPLING // undefined to remove fancy upsampling support 398 399 // Convert a pair of y/u/v lines together to the output rgb/a colorspace. 400 // bottom_y can be NULL if only one line of output is needed (at top/bottom). 401 typedef void (*WebPUpsampleLinePairFunc)( 402 const uint8_t* top_y, const uint8_t* bottom_y, 403 const uint8_t* top_u, const uint8_t* top_v, 404 const uint8_t* cur_u, const uint8_t* cur_v, 405 uint8_t* top_dst, uint8_t* bottom_dst, int len); 406 407 #ifdef FANCY_UPSAMPLING 408 409 // Fancy upsampling functions to convert YUV to RGB(A) modes 410 extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */]; 411 412 #endif // FANCY_UPSAMPLING 413 414 // Per-row point-sampling methods. 415 typedef void (*WebPSamplerRowFunc)(const uint8_t* y, 416 const uint8_t* u, const uint8_t* v, 417 uint8_t* dst, int len); 418 // Generic function to apply 'WebPSamplerRowFunc' to the whole plane: 419 void WebPSamplerProcessPlane(const uint8_t* y, int y_stride, 420 const uint8_t* u, const uint8_t* v, int uv_stride, 421 uint8_t* dst, int dst_stride, 422 int width, int height, WebPSamplerRowFunc func); 423 424 // Sampling functions to convert rows of YUV to RGB(A) 425 extern WebPSamplerRowFunc WebPSamplers[/* MODE_LAST */]; 426 427 // General function for converting two lines of ARGB or RGBA. 428 // 'alpha_is_last' should be true if 0xff000000 is stored in memory as 429 // as 0x00, 0x00, 0x00, 0xff (little endian). 430 WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last); 431 432 // YUV444->RGB converters 433 typedef void (*WebPYUV444Converter)(const uint8_t* y, 434 const uint8_t* u, const uint8_t* v, 435 uint8_t* dst, int len); 436 437 extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */]; 438 439 // Must be called before using the WebPUpsamplers[] (and for premultiplied 440 // colorspaces like rgbA, rgbA4444, etc) 441 void WebPInitUpsamplers(void); 442 // Must be called before using WebPSamplers[] 443 void WebPInitSamplers(void); 444 // Must be called before using WebPYUV444Converters[] 445 void WebPInitYUV444Converters(void); 446 447 //------------------------------------------------------------------------------ 448 // ARGB -> YUV converters 449 450 // Convert ARGB samples to luma Y. 451 extern void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width); 452 // Convert ARGB samples to U/V with downsampling. do_store should be '1' for 453 // even lines and '0' for odd ones. 'src_width' is the original width, not 454 // the U/V one. 455 extern void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v, 456 int src_width, int do_store); 457 458 // Convert a row of accumulated (four-values) of rgba32 toward U/V 459 extern void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb, 460 uint8_t* u, uint8_t* v, int width); 461 462 // Convert RGB or BGR to Y 463 extern void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width); 464 extern void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width); 465 466 // used for plain-C fallback. 467 extern void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v, 468 int src_width, int do_store); 469 extern void WebPConvertRGBA32ToUV_C(const uint16_t* rgb, 470 uint8_t* u, uint8_t* v, int width); 471 472 // utilities for accurate RGB->YUV conversion 473 extern uint64_t (*WebPSharpYUVUpdateY)(const uint16_t* src, const uint16_t* ref, 474 uint16_t* dst, int len); 475 extern void (*WebPSharpYUVUpdateRGB)(const int16_t* src, const int16_t* ref, 476 int16_t* dst, int len); 477 extern void (*WebPSharpYUVFilterRow)(const int16_t* A, const int16_t* B, 478 int len, 479 const uint16_t* best_y, uint16_t* out); 480 481 // Must be called before using the above. 482 void WebPInitConvertARGBToYUV(void); 483 484 //------------------------------------------------------------------------------ 485 // Rescaler 486 487 struct WebPRescaler; 488 489 // Import a row of data and save its contribution in the rescaler. 490 // 'channel' denotes the channel number to be imported. 'Expand' corresponds to 491 // the wrk->x_expand case. Otherwise, 'Shrink' is to be used. 492 typedef void (*WebPRescalerImportRowFunc)(struct WebPRescaler* const wrk, 493 const uint8_t* src); 494 495 extern WebPRescalerImportRowFunc WebPRescalerImportRowExpand; 496 extern WebPRescalerImportRowFunc WebPRescalerImportRowShrink; 497 498 // Export one row (starting at x_out position) from rescaler. 499 // 'Expand' corresponds to the wrk->y_expand case. 500 // Otherwise 'Shrink' is to be used 501 typedef void (*WebPRescalerExportRowFunc)(struct WebPRescaler* const wrk); 502 extern WebPRescalerExportRowFunc WebPRescalerExportRowExpand; 503 extern WebPRescalerExportRowFunc WebPRescalerExportRowShrink; 504 505 // Plain-C implementation, as fall-back. 506 extern void WebPRescalerImportRowExpand_C(struct WebPRescaler* const wrk, 507 const uint8_t* src); 508 extern void WebPRescalerImportRowShrink_C(struct WebPRescaler* const wrk, 509 const uint8_t* src); 510 extern void WebPRescalerExportRowExpand_C(struct WebPRescaler* const wrk); 511 extern void WebPRescalerExportRowShrink_C(struct WebPRescaler* const wrk); 512 513 // Main entry calls: 514 extern void WebPRescalerImportRow(struct WebPRescaler* const wrk, 515 const uint8_t* src); 516 // Export one row (starting at x_out position) from rescaler. 517 extern void WebPRescalerExportRow(struct WebPRescaler* const wrk); 518 519 // Must be called first before using the above. 520 void WebPRescalerDspInit(void); 521 522 //------------------------------------------------------------------------------ 523 // Utilities for processing transparent channel. 524 525 // Apply alpha pre-multiply on an rgba, bgra or argb plane of size w * h. 526 // alpha_first should be 0 for argb, 1 for rgba or bgra (where alpha is last). 527 extern void (*WebPApplyAlphaMultiply)( 528 uint8_t* rgba, int alpha_first, int w, int h, int stride); 529 530 // Same, buf specifically for RGBA4444 format 531 extern void (*WebPApplyAlphaMultiply4444)( 532 uint8_t* rgba4444, int w, int h, int stride); 533 534 // Dispatch the values from alpha[] plane to the ARGB destination 'dst'. 535 // Returns true if alpha[] plane has non-trivial values different from 0xff. 536 extern int (*WebPDispatchAlpha)(const uint8_t* alpha, int alpha_stride, 537 int width, int height, 538 uint8_t* dst, int dst_stride); 539 540 // Transfer packed 8b alpha[] values to green channel in dst[], zero'ing the 541 // A/R/B values. 'dst_stride' is the stride for dst[] in uint32_t units. 542 extern void (*WebPDispatchAlphaToGreen)(const uint8_t* alpha, int alpha_stride, 543 int width, int height, 544 uint32_t* dst, int dst_stride); 545 546 // Extract the alpha values from 32b values in argb[] and pack them into alpha[] 547 // (this is the opposite of WebPDispatchAlpha). 548 // Returns true if there's only trivial 0xff alpha values. 549 extern int (*WebPExtractAlpha)(const uint8_t* argb, int argb_stride, 550 int width, int height, 551 uint8_t* alpha, int alpha_stride); 552 553 // Extract the green values from 32b values in argb[] and pack them into alpha[] 554 // (this is the opposite of WebPDispatchAlphaToGreen). 555 extern void (*WebPExtractGreen)(const uint32_t* argb, uint8_t* alpha, int size); 556 557 // Pre-Multiply operation transforms x into x * A / 255 (where x=Y,R,G or B). 558 // Un-Multiply operation transforms x into x * 255 / A. 559 560 // Pre-Multiply or Un-Multiply (if 'inverse' is true) argb values in a row. 561 extern void (*WebPMultARGBRow)(uint32_t* const ptr, int width, int inverse); 562 563 // Same a WebPMultARGBRow(), but for several rows. 564 void WebPMultARGBRows(uint8_t* ptr, int stride, int width, int num_rows, 565 int inverse); 566 567 // Same for a row of single values, with side alpha values. 568 extern void (*WebPMultRow)(uint8_t* const ptr, const uint8_t* const alpha, 569 int width, int inverse); 570 571 // Same a WebPMultRow(), but for several 'num_rows' rows. 572 void WebPMultRows(uint8_t* ptr, int stride, 573 const uint8_t* alpha, int alpha_stride, 574 int width, int num_rows, int inverse); 575 576 // Plain-C versions, used as fallback by some implementations. 577 void WebPMultRow_C(uint8_t* const ptr, const uint8_t* const alpha, 578 int width, int inverse); 579 void WebPMultARGBRow_C(uint32_t* const ptr, int width, int inverse); 580 581 // RGB packing function. 'step' can be 3 or 4. r/g/b input is rgb or bgr order. 582 extern void (*WebPPackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b, 583 int len, int step, uint32_t* out); 584 585 // This function returns true if src[i] contains a value different from 0xff. 586 extern int (*WebPHasAlpha8b)(const uint8_t* src, int length); 587 // This function returns true if src[4*i] contains a value different from 0xff. 588 extern int (*WebPHasAlpha32b)(const uint8_t* src, int length); 589 590 // To be called first before using the above. 591 void WebPInitAlphaProcessing(void); 592 593 //------------------------------------------------------------------------------ 594 // Filter functions 595 596 typedef enum { // Filter types. 597 WEBP_FILTER_NONE = 0, 598 WEBP_FILTER_HORIZONTAL, 599 WEBP_FILTER_VERTICAL, 600 WEBP_FILTER_GRADIENT, 601 WEBP_FILTER_LAST = WEBP_FILTER_GRADIENT + 1, // end marker 602 WEBP_FILTER_BEST, // meta-types 603 WEBP_FILTER_FAST 604 } WEBP_FILTER_TYPE; 605 606 typedef void (*WebPFilterFunc)(const uint8_t* in, int width, int height, 607 int stride, uint8_t* out); 608 // In-place un-filtering. 609 // Warning! 'prev_line' pointer can be equal to 'cur_line' or 'preds'. 610 typedef void (*WebPUnfilterFunc)(const uint8_t* prev_line, const uint8_t* preds, 611 uint8_t* cur_line, int width); 612 613 // Filter the given data using the given predictor. 614 // 'in' corresponds to a 2-dimensional pixel array of size (stride * height) 615 // in raster order. 616 // 'stride' is number of bytes per scan line (with possible padding). 617 // 'out' should be pre-allocated. 618 extern WebPFilterFunc WebPFilters[WEBP_FILTER_LAST]; 619 620 // In-place reconstruct the original data from the given filtered data. 621 // The reconstruction will be done for 'num_rows' rows starting from 'row' 622 // (assuming rows upto 'row - 1' are already reconstructed). 623 extern WebPUnfilterFunc WebPUnfilters[WEBP_FILTER_LAST]; 624 625 // To be called first before using the above. 626 void VP8FiltersInit(void); 627 628 #ifdef __cplusplus 629 } // extern "C" 630 #endif 631 632 #endif /* WEBP_DSP_DSP_H_ */ 633