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 "../webp/config.h" 19 #endif 20 21 #include "../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 #ifndef __has_builtin 42 # define __has_builtin(x) 0 43 #endif 44 45 #if defined(_MSC_VER) && _MSC_VER > 1310 && \ 46 (defined(_M_X64) || defined(_M_IX86)) 47 #define WEBP_MSC_SSE2 // Visual C++ SSE2 targets 48 #endif 49 50 #if defined(_MSC_VER) && _MSC_VER >= 1500 && \ 51 (defined(_M_X64) || defined(_M_IX86)) 52 #define WEBP_MSC_SSE41 // Visual C++ SSE4.1 targets 53 #endif 54 55 // WEBP_HAVE_* are used to indicate the presence of the instruction set in dsp 56 // files without intrinsics, allowing the corresponding Init() to be called. 57 // Files containing intrinsics will need to be built targeting the instruction 58 // set so should succeed on one of the earlier tests. 59 #if defined(__SSE2__) || defined(WEBP_MSC_SSE2) || defined(WEBP_HAVE_SSE2) 60 #define WEBP_USE_SSE2 61 #endif 62 63 #if defined(__SSE4_1__) || defined(WEBP_MSC_SSE41) || defined(WEBP_HAVE_SSE41) 64 #define WEBP_USE_SSE41 65 #endif 66 67 #if defined(__AVX2__) || defined(WEBP_HAVE_AVX2) 68 #define WEBP_USE_AVX2 69 #endif 70 71 // The intrinsics currently cause compiler errors with arm-nacl-gcc and the 72 // inline assembly would need to be modified for use with Native Client. 73 #if (defined(__ARM_NEON__) || \ 74 defined(__aarch64__) || defined(WEBP_HAVE_NEON)) && \ 75 !defined(__native_client__) 76 #define WEBP_USE_NEON 77 #endif 78 79 #if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_M_ARM) 80 #define WEBP_USE_NEON 81 #define WEBP_USE_INTRINSICS 82 #endif 83 84 #if defined(__mips__) && !defined(__mips64) && \ 85 defined(__mips_isa_rev) && (__mips_isa_rev >= 1) && (__mips_isa_rev < 6) 86 #define WEBP_USE_MIPS32 87 #if (__mips_isa_rev >= 2) 88 #define WEBP_USE_MIPS32_R2 89 #if defined(__mips_dspr2) || (__mips_dsp_rev >= 2) 90 #define WEBP_USE_MIPS_DSP_R2 91 #endif 92 #endif 93 #endif 94 95 #if defined(__mips_msa) && defined(__mips_isa_rev) && (__mips_isa_rev >= 5) 96 #define WEBP_USE_MSA 97 #endif 98 99 // This macro prevents thread_sanitizer from reporting known concurrent writes. 100 #define WEBP_TSAN_IGNORE_FUNCTION 101 #if defined(__has_feature) 102 #if __has_feature(thread_sanitizer) 103 #undef WEBP_TSAN_IGNORE_FUNCTION 104 #define WEBP_TSAN_IGNORE_FUNCTION __attribute__((no_sanitize_thread)) 105 #endif 106 #endif 107 108 #define WEBP_UBSAN_IGNORE_UNDEF 109 #define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW 110 #if defined(__clang__) && defined(__has_attribute) 111 #if __has_attribute(no_sanitize) 112 // This macro prevents the undefined behavior sanitizer from reporting 113 // failures. This is only meant to silence unaligned loads on platforms that 114 // are known to support them. 115 #undef WEBP_UBSAN_IGNORE_UNDEF 116 #define WEBP_UBSAN_IGNORE_UNDEF \ 117 __attribute__((no_sanitize("undefined"))) 118 119 // This macro prevents the undefined behavior sanitizer from reporting 120 // failures related to unsigned integer overflows. This is only meant to 121 // silence cases where this well defined behavior is expected. 122 #undef WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW 123 #define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW \ 124 __attribute__((no_sanitize("unsigned-integer-overflow"))) 125 #endif 126 #endif 127 128 typedef enum { 129 kSSE2, 130 kSSE3, 131 kSlowSSSE3, // special feature for slow SSSE3 architectures 132 kSSE4_1, 133 kAVX, 134 kAVX2, 135 kNEON, 136 kMIPS32, 137 kMIPSdspR2, 138 kMSA 139 } CPUFeature; 140 // returns true if the CPU supports the feature. 141 typedef int (*VP8CPUInfo)(CPUFeature feature); 142 WEBP_EXTERN(VP8CPUInfo) VP8GetCPUInfo; 143 144 //------------------------------------------------------------------------------ 145 // Init stub generator 146 147 // Defines an init function stub to ensure each module exposes a symbol, 148 // avoiding a compiler warning. 149 #define WEBP_DSP_INIT_STUB(func) \ 150 extern void func(void); \ 151 WEBP_TSAN_IGNORE_FUNCTION void func(void) {} 152 153 //------------------------------------------------------------------------------ 154 // Encoding 155 156 // Transforms 157 // VP8Idct: Does one of two inverse transforms. If do_two is set, the transforms 158 // will be done for (ref, in, dst) and (ref + 4, in + 16, dst + 4). 159 typedef void (*VP8Idct)(const uint8_t* ref, const int16_t* in, uint8_t* dst, 160 int do_two); 161 typedef void (*VP8Fdct)(const uint8_t* src, const uint8_t* ref, int16_t* out); 162 typedef void (*VP8WHT)(const int16_t* in, int16_t* out); 163 extern VP8Idct VP8ITransform; 164 extern VP8Fdct VP8FTransform; 165 extern VP8Fdct VP8FTransform2; // performs two transforms at a time 166 extern VP8WHT VP8FTransformWHT; 167 // Predictions 168 // *dst is the destination block. *top and *left can be NULL. 169 typedef void (*VP8IntraPreds)(uint8_t *dst, const uint8_t* left, 170 const uint8_t* top); 171 typedef void (*VP8Intra4Preds)(uint8_t *dst, const uint8_t* top); 172 extern VP8Intra4Preds VP8EncPredLuma4; 173 extern VP8IntraPreds VP8EncPredLuma16; 174 extern VP8IntraPreds VP8EncPredChroma8; 175 176 typedef int (*VP8Metric)(const uint8_t* pix, const uint8_t* ref); 177 extern VP8Metric VP8SSE16x16, VP8SSE16x8, VP8SSE8x8, VP8SSE4x4; 178 typedef int (*VP8WMetric)(const uint8_t* pix, const uint8_t* ref, 179 const uint16_t* const weights); 180 // The weights for VP8TDisto4x4 and VP8TDisto16x16 contain a row-major 181 // 4 by 4 symmetric matrix. 182 extern VP8WMetric VP8TDisto4x4, VP8TDisto16x16; 183 184 // Compute the average (DC) of four 4x4 blocks. 185 // Each sub-4x4 block #i sum is stored in dc[i]. 186 typedef void (*VP8MeanMetric)(const uint8_t* ref, uint32_t dc[4]); 187 extern VP8MeanMetric VP8Mean16x4; 188 189 typedef void (*VP8BlockCopy)(const uint8_t* src, uint8_t* dst); 190 extern VP8BlockCopy VP8Copy4x4; 191 extern VP8BlockCopy VP8Copy16x8; 192 // Quantization 193 struct VP8Matrix; // forward declaration 194 typedef int (*VP8QuantizeBlock)(int16_t in[16], int16_t out[16], 195 const struct VP8Matrix* const mtx); 196 // Same as VP8QuantizeBlock, but quantizes two consecutive blocks. 197 typedef int (*VP8Quantize2Blocks)(int16_t in[32], int16_t out[32], 198 const struct VP8Matrix* const mtx); 199 200 extern VP8QuantizeBlock VP8EncQuantizeBlock; 201 extern VP8Quantize2Blocks VP8EncQuantize2Blocks; 202 203 // specific to 2nd transform: 204 typedef int (*VP8QuantizeBlockWHT)(int16_t in[16], int16_t out[16], 205 const struct VP8Matrix* const mtx); 206 extern VP8QuantizeBlockWHT VP8EncQuantizeBlockWHT; 207 208 extern const int VP8DspScan[16 + 4 + 4]; 209 210 // Collect histogram for susceptibility calculation. 211 #define MAX_COEFF_THRESH 31 // size of histogram used by CollectHistogram. 212 typedef struct { 213 // We only need to store max_value and last_non_zero, not the distribution. 214 int max_value; 215 int last_non_zero; 216 } VP8Histogram; 217 typedef void (*VP8CHisto)(const uint8_t* ref, const uint8_t* pred, 218 int start_block, int end_block, 219 VP8Histogram* const histo); 220 extern VP8CHisto VP8CollectHistogram; 221 // General-purpose util function to help VP8CollectHistogram(). 222 void VP8SetHistogramData(const int distribution[MAX_COEFF_THRESH + 1], 223 VP8Histogram* const histo); 224 225 // must be called before using any of the above 226 void VP8EncDspInit(void); 227 228 //------------------------------------------------------------------------------ 229 // cost functions (encoding) 230 231 extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) 232 // approximate cost per level: 233 extern const uint16_t VP8LevelFixedCosts[2047 /*MAX_LEVEL*/ + 1]; 234 extern const uint8_t VP8EncBands[16 + 1]; 235 236 struct VP8Residual; 237 typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs, 238 struct VP8Residual* const res); 239 extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs; 240 241 // Cost calculation function. 242 typedef int (*VP8GetResidualCostFunc)(int ctx0, 243 const struct VP8Residual* const res); 244 extern VP8GetResidualCostFunc VP8GetResidualCost; 245 246 // must be called before anything using the above 247 void VP8EncDspCostInit(void); 248 249 //------------------------------------------------------------------------------ 250 // SSIM / PSNR utils 251 252 // struct for accumulating statistical moments 253 typedef struct { 254 uint32_t w; // sum(w_i) : sum of weights 255 uint32_t xm, ym; // sum(w_i * x_i), sum(w_i * y_i) 256 uint32_t xxm, xym, yym; // sum(w_i * x_i * x_i), etc. 257 } VP8DistoStats; 258 259 // Compute the final SSIM value 260 // The non-clipped version assumes stats->w = (2 * VP8_SSIM_KERNEL + 1)^2. 261 double VP8SSIMFromStats(const VP8DistoStats* const stats); 262 double VP8SSIMFromStatsClipped(const VP8DistoStats* const stats); 263 264 #define VP8_SSIM_KERNEL 3 // total size of the kernel: 2 * VP8_SSIM_KERNEL + 1 265 typedef double (*VP8SSIMGetClippedFunc)(const uint8_t* src1, int stride1, 266 const uint8_t* src2, int stride2, 267 int xo, int yo, // center position 268 int W, int H); // plane dimension 269 270 // This version is called with the guarantee that you can load 8 bytes and 271 // 8 rows at offset src1 and src2 272 typedef double (*VP8SSIMGetFunc)(const uint8_t* src1, int stride1, 273 const uint8_t* src2, int stride2); 274 275 extern VP8SSIMGetFunc VP8SSIMGet; // unclipped / unchecked 276 extern VP8SSIMGetClippedFunc VP8SSIMGetClipped; // with clipping 277 278 typedef uint32_t (*VP8AccumulateSSEFunc)(const uint8_t* src1, 279 const uint8_t* src2, int len); 280 extern VP8AccumulateSSEFunc VP8AccumulateSSE; 281 282 // must be called before using any of the above directly 283 void VP8SSIMDspInit(void); 284 285 //------------------------------------------------------------------------------ 286 // Decoding 287 288 typedef void (*VP8DecIdct)(const int16_t* coeffs, uint8_t* dst); 289 // when doing two transforms, coeffs is actually int16_t[2][16]. 290 typedef void (*VP8DecIdct2)(const int16_t* coeffs, uint8_t* dst, int do_two); 291 extern VP8DecIdct2 VP8Transform; 292 extern VP8DecIdct VP8TransformAC3; 293 extern VP8DecIdct VP8TransformUV; 294 extern VP8DecIdct VP8TransformDC; 295 extern VP8DecIdct VP8TransformDCUV; 296 extern VP8WHT VP8TransformWHT; 297 298 // *dst is the destination block, with stride BPS. Boundary samples are 299 // assumed accessible when needed. 300 typedef void (*VP8PredFunc)(uint8_t* dst); 301 extern VP8PredFunc VP8PredLuma16[/* NUM_B_DC_MODES */]; 302 extern VP8PredFunc VP8PredChroma8[/* NUM_B_DC_MODES */]; 303 extern VP8PredFunc VP8PredLuma4[/* NUM_BMODES */]; 304 305 // clipping tables (for filtering) 306 extern const int8_t* const VP8ksclip1; // clips [-1020, 1020] to [-128, 127] 307 extern const int8_t* const VP8ksclip2; // clips [-112, 112] to [-16, 15] 308 extern const uint8_t* const VP8kclip1; // clips [-255,511] to [0,255] 309 extern const uint8_t* const VP8kabs0; // abs(x) for x in [-255,255] 310 // must be called first 311 void VP8InitClipTables(void); 312 313 // simple filter (only for luma) 314 typedef void (*VP8SimpleFilterFunc)(uint8_t* p, int stride, int thresh); 315 extern VP8SimpleFilterFunc VP8SimpleVFilter16; 316 extern VP8SimpleFilterFunc VP8SimpleHFilter16; 317 extern VP8SimpleFilterFunc VP8SimpleVFilter16i; // filter 3 inner edges 318 extern VP8SimpleFilterFunc VP8SimpleHFilter16i; 319 320 // regular filter (on both macroblock edges and inner edges) 321 typedef void (*VP8LumaFilterFunc)(uint8_t* luma, int stride, 322 int thresh, int ithresh, int hev_t); 323 typedef void (*VP8ChromaFilterFunc)(uint8_t* u, uint8_t* v, int stride, 324 int thresh, int ithresh, int hev_t); 325 // on outer edge 326 extern VP8LumaFilterFunc VP8VFilter16; 327 extern VP8LumaFilterFunc VP8HFilter16; 328 extern VP8ChromaFilterFunc VP8VFilter8; 329 extern VP8ChromaFilterFunc VP8HFilter8; 330 331 // on inner edge 332 extern VP8LumaFilterFunc VP8VFilter16i; // filtering 3 inner edges altogether 333 extern VP8LumaFilterFunc VP8HFilter16i; 334 extern VP8ChromaFilterFunc VP8VFilter8i; // filtering u and v altogether 335 extern VP8ChromaFilterFunc VP8HFilter8i; 336 337 // Dithering. Combines dithering values (centered around 128) with dst[], 338 // according to: dst[] = clip(dst[] + (((dither[]-128) + 8) >> 4) 339 #define VP8_DITHER_DESCALE 4 340 #define VP8_DITHER_DESCALE_ROUNDER (1 << (VP8_DITHER_DESCALE - 1)) 341 #define VP8_DITHER_AMP_BITS 7 342 #define VP8_DITHER_AMP_CENTER (1 << VP8_DITHER_AMP_BITS) 343 extern void (*VP8DitherCombine8x8)(const uint8_t* dither, uint8_t* dst, 344 int dst_stride); 345 346 // must be called before anything using the above 347 void VP8DspInit(void); 348 349 //------------------------------------------------------------------------------ 350 // WebP I/O 351 352 #define FANCY_UPSAMPLING // undefined to remove fancy upsampling support 353 354 // Convert a pair of y/u/v lines together to the output rgb/a colorspace. 355 // bottom_y can be NULL if only one line of output is needed (at top/bottom). 356 typedef void (*WebPUpsampleLinePairFunc)( 357 const uint8_t* top_y, const uint8_t* bottom_y, 358 const uint8_t* top_u, const uint8_t* top_v, 359 const uint8_t* cur_u, const uint8_t* cur_v, 360 uint8_t* top_dst, uint8_t* bottom_dst, int len); 361 362 #ifdef FANCY_UPSAMPLING 363 364 // Fancy upsampling functions to convert YUV to RGB(A) modes 365 extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */]; 366 367 #endif // FANCY_UPSAMPLING 368 369 // Per-row point-sampling methods. 370 typedef void (*WebPSamplerRowFunc)(const uint8_t* y, 371 const uint8_t* u, const uint8_t* v, 372 uint8_t* dst, int len); 373 // Generic function to apply 'WebPSamplerRowFunc' to the whole plane: 374 void WebPSamplerProcessPlane(const uint8_t* y, int y_stride, 375 const uint8_t* u, const uint8_t* v, int uv_stride, 376 uint8_t* dst, int dst_stride, 377 int width, int height, WebPSamplerRowFunc func); 378 379 // Sampling functions to convert rows of YUV to RGB(A) 380 extern WebPSamplerRowFunc WebPSamplers[/* MODE_LAST */]; 381 382 // General function for converting two lines of ARGB or RGBA. 383 // 'alpha_is_last' should be true if 0xff000000 is stored in memory as 384 // as 0x00, 0x00, 0x00, 0xff (little endian). 385 WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last); 386 387 // YUV444->RGB converters 388 typedef void (*WebPYUV444Converter)(const uint8_t* y, 389 const uint8_t* u, const uint8_t* v, 390 uint8_t* dst, int len); 391 392 extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */]; 393 394 // Must be called before using the WebPUpsamplers[] (and for premultiplied 395 // colorspaces like rgbA, rgbA4444, etc) 396 void WebPInitUpsamplers(void); 397 // Must be called before using WebPSamplers[] 398 void WebPInitSamplers(void); 399 // Must be called before using WebPYUV444Converters[] 400 void WebPInitYUV444Converters(void); 401 402 //------------------------------------------------------------------------------ 403 // ARGB -> YUV converters 404 405 // Convert ARGB samples to luma Y. 406 extern void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width); 407 // Convert ARGB samples to U/V with downsampling. do_store should be '1' for 408 // even lines and '0' for odd ones. 'src_width' is the original width, not 409 // the U/V one. 410 extern void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v, 411 int src_width, int do_store); 412 413 // Convert a row of accumulated (four-values) of rgba32 toward U/V 414 extern void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb, 415 uint8_t* u, uint8_t* v, int width); 416 417 // Convert RGB or BGR to Y 418 extern void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width); 419 extern void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width); 420 421 // used for plain-C fallback. 422 extern void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v, 423 int src_width, int do_store); 424 extern void WebPConvertRGBA32ToUV_C(const uint16_t* rgb, 425 uint8_t* u, uint8_t* v, int width); 426 427 // utilities for accurate RGB->YUV conversion 428 extern uint64_t (*WebPSharpYUVUpdateY)(const uint16_t* src, const uint16_t* ref, 429 uint16_t* dst, int len); 430 extern void (*WebPSharpYUVUpdateRGB)(const int16_t* src, const int16_t* ref, 431 int16_t* dst, int len); 432 extern void (*WebPSharpYUVFilterRow)(const int16_t* A, const int16_t* B, 433 int len, 434 const uint16_t* best_y, uint16_t* out); 435 436 // Must be called before using the above. 437 void WebPInitConvertARGBToYUV(void); 438 439 //------------------------------------------------------------------------------ 440 // Rescaler 441 442 struct WebPRescaler; 443 444 // Import a row of data and save its contribution in the rescaler. 445 // 'channel' denotes the channel number to be imported. 'Expand' corresponds to 446 // the wrk->x_expand case. Otherwise, 'Shrink' is to be used. 447 typedef void (*WebPRescalerImportRowFunc)(struct WebPRescaler* const wrk, 448 const uint8_t* src); 449 450 extern WebPRescalerImportRowFunc WebPRescalerImportRowExpand; 451 extern WebPRescalerImportRowFunc WebPRescalerImportRowShrink; 452 453 // Export one row (starting at x_out position) from rescaler. 454 // 'Expand' corresponds to the wrk->y_expand case. 455 // Otherwise 'Shrink' is to be used 456 typedef void (*WebPRescalerExportRowFunc)(struct WebPRescaler* const wrk); 457 extern WebPRescalerExportRowFunc WebPRescalerExportRowExpand; 458 extern WebPRescalerExportRowFunc WebPRescalerExportRowShrink; 459 460 // Plain-C implementation, as fall-back. 461 extern void WebPRescalerImportRowExpandC(struct WebPRescaler* const wrk, 462 const uint8_t* src); 463 extern void WebPRescalerImportRowShrinkC(struct WebPRescaler* const wrk, 464 const uint8_t* src); 465 extern void WebPRescalerExportRowExpandC(struct WebPRescaler* const wrk); 466 extern void WebPRescalerExportRowShrinkC(struct WebPRescaler* const wrk); 467 468 // Main entry calls: 469 extern void WebPRescalerImportRow(struct WebPRescaler* const wrk, 470 const uint8_t* src); 471 // Export one row (starting at x_out position) from rescaler. 472 extern void WebPRescalerExportRow(struct WebPRescaler* const wrk); 473 474 // Must be called first before using the above. 475 void WebPRescalerDspInit(void); 476 477 //------------------------------------------------------------------------------ 478 // Utilities for processing transparent channel. 479 480 // Apply alpha pre-multiply on an rgba, bgra or argb plane of size w * h. 481 // alpha_first should be 0 for argb, 1 for rgba or bgra (where alpha is last). 482 extern void (*WebPApplyAlphaMultiply)( 483 uint8_t* rgba, int alpha_first, int w, int h, int stride); 484 485 // Same, buf specifically for RGBA4444 format 486 extern void (*WebPApplyAlphaMultiply4444)( 487 uint8_t* rgba4444, int w, int h, int stride); 488 489 // Dispatch the values from alpha[] plane to the ARGB destination 'dst'. 490 // Returns true if alpha[] plane has non-trivial values different from 0xff. 491 extern int (*WebPDispatchAlpha)(const uint8_t* alpha, int alpha_stride, 492 int width, int height, 493 uint8_t* dst, int dst_stride); 494 495 // Transfer packed 8b alpha[] values to green channel in dst[], zero'ing the 496 // A/R/B values. 'dst_stride' is the stride for dst[] in uint32_t units. 497 extern void (*WebPDispatchAlphaToGreen)(const uint8_t* alpha, int alpha_stride, 498 int width, int height, 499 uint32_t* dst, int dst_stride); 500 501 // Extract the alpha values from 32b values in argb[] and pack them into alpha[] 502 // (this is the opposite of WebPDispatchAlpha). 503 // Returns true if there's only trivial 0xff alpha values. 504 extern int (*WebPExtractAlpha)(const uint8_t* argb, int argb_stride, 505 int width, int height, 506 uint8_t* alpha, int alpha_stride); 507 508 // Extract the green values from 32b values in argb[] and pack them into alpha[] 509 // (this is the opposite of WebPDispatchAlphaToGreen). 510 extern void (*WebPExtractGreen)(const uint32_t* argb, uint8_t* alpha, int size); 511 512 // Pre-Multiply operation transforms x into x * A / 255 (where x=Y,R,G or B). 513 // Un-Multiply operation transforms x into x * 255 / A. 514 515 // Pre-Multiply or Un-Multiply (if 'inverse' is true) argb values in a row. 516 extern void (*WebPMultARGBRow)(uint32_t* const ptr, int width, int inverse); 517 518 // Same a WebPMultARGBRow(), but for several rows. 519 void WebPMultARGBRows(uint8_t* ptr, int stride, int width, int num_rows, 520 int inverse); 521 522 // Same for a row of single values, with side alpha values. 523 extern void (*WebPMultRow)(uint8_t* const ptr, const uint8_t* const alpha, 524 int width, int inverse); 525 526 // Same a WebPMultRow(), but for several 'num_rows' rows. 527 void WebPMultRows(uint8_t* ptr, int stride, 528 const uint8_t* alpha, int alpha_stride, 529 int width, int num_rows, int inverse); 530 531 // Plain-C versions, used as fallback by some implementations. 532 void WebPMultRowC(uint8_t* const ptr, const uint8_t* const alpha, 533 int width, int inverse); 534 void WebPMultARGBRowC(uint32_t* const ptr, int width, int inverse); 535 536 // To be called first before using the above. 537 void WebPInitAlphaProcessing(void); 538 539 // ARGB packing function: a/r/g/b input is rgba or bgra order. 540 extern void (*VP8PackARGB)(const uint8_t* a, const uint8_t* r, 541 const uint8_t* g, const uint8_t* b, int len, 542 uint32_t* out); 543 544 // RGB packing function. 'step' can be 3 or 4. r/g/b input is rgb or bgr order. 545 extern void (*VP8PackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b, 546 int len, int step, uint32_t* out); 547 548 // To be called first before using the above. 549 void VP8EncDspARGBInit(void); 550 551 //------------------------------------------------------------------------------ 552 // Filter functions 553 554 typedef enum { // Filter types. 555 WEBP_FILTER_NONE = 0, 556 WEBP_FILTER_HORIZONTAL, 557 WEBP_FILTER_VERTICAL, 558 WEBP_FILTER_GRADIENT, 559 WEBP_FILTER_LAST = WEBP_FILTER_GRADIENT + 1, // end marker 560 WEBP_FILTER_BEST, // meta-types 561 WEBP_FILTER_FAST 562 } WEBP_FILTER_TYPE; 563 564 typedef void (*WebPFilterFunc)(const uint8_t* in, int width, int height, 565 int stride, uint8_t* out); 566 // In-place un-filtering. 567 // Warning! 'prev_line' pointer can be equal to 'cur_line' or 'preds'. 568 typedef void (*WebPUnfilterFunc)(const uint8_t* prev_line, const uint8_t* preds, 569 uint8_t* cur_line, int width); 570 571 // Filter the given data using the given predictor. 572 // 'in' corresponds to a 2-dimensional pixel array of size (stride * height) 573 // in raster order. 574 // 'stride' is number of bytes per scan line (with possible padding). 575 // 'out' should be pre-allocated. 576 extern WebPFilterFunc WebPFilters[WEBP_FILTER_LAST]; 577 578 // In-place reconstruct the original data from the given filtered data. 579 // The reconstruction will be done for 'num_rows' rows starting from 'row' 580 // (assuming rows upto 'row - 1' are already reconstructed). 581 extern WebPUnfilterFunc WebPUnfilters[WEBP_FILTER_LAST]; 582 583 // To be called first before using the above. 584 void VP8FiltersInit(void); 585 586 #ifdef __cplusplus 587 } // extern "C" 588 #endif 589 590 #endif /* WEBP_DSP_DSP_H_ */ 591