// Copyright 2011 Google Inc. All Rights Reserved. // // Use of this source code is governed by a BSD-style license // that can be found in the COPYING file in the root of the source // tree. An additional intellectual property rights grant can be found // in the file PATENTS. All contributing project authors may // be found in the AUTHORS file in the root of the source tree. // ----------------------------------------------------------------------------- // // Speed-critical functions. // // Author: Skal ([email protected]) #ifndef WEBP_DSP_DSP_H_ #define WEBP_DSP_DSP_H_ #ifdef HAVE_CONFIG_H #include "src/webp/config.h" #endif #include "src/dsp/cpu.h" #include "src/webp/types.h" #ifdef __cplusplus extern "C" { #endif #define BPS … //------------------------------------------------------------------------------ // WEBP_RESTRICT // Declares a pointer with the restrict type qualifier if available. // This allows code to hint to the compiler that only this pointer references a // particular object or memory region within the scope of the block in which it // is declared. This may allow for improved optimizations due to the lack of // pointer aliasing. See also: // https://en.cppreference.com/w/c/language/restrict #if defined(__GNUC__) #define WEBP_RESTRICT … #elif defined(_MSC_VER) #define WEBP_RESTRICT … #else #define WEBP_RESTRICT #endif //------------------------------------------------------------------------------ // Init stub generator // Defines an init function stub to ensure each module exposes a symbol, // avoiding a compiler warning. #define WEBP_DSP_INIT_STUB(func) … //------------------------------------------------------------------------------ // Encoding // Transforms // VP8Idct: Does one of two inverse transforms. If do_two is set, the transforms // will be done for (ref, in, dst) and (ref + 4, in + 16, dst + 4). VP8Idct; VP8Fdct; VP8WHT; extern VP8Idct VP8ITransform; extern VP8Fdct VP8FTransform; extern VP8Fdct VP8FTransform2; // performs two transforms at a time extern VP8WHT VP8FTransformWHT; // Predictions // *dst is the destination block. *top and *left can be NULL. VP8IntraPreds; VP8Intra4Preds; extern VP8Intra4Preds VP8EncPredLuma4; extern VP8IntraPreds VP8EncPredLuma16; extern VP8IntraPreds VP8EncPredChroma8; VP8Metric; extern VP8Metric VP8SSE16x16, VP8SSE16x8, VP8SSE8x8, VP8SSE4x4; VP8WMetric; // The weights for VP8TDisto4x4 and VP8TDisto16x16 contain a row-major // 4 by 4 symmetric matrix. extern VP8WMetric VP8TDisto4x4, VP8TDisto16x16; // Compute the average (DC) of four 4x4 blocks. // Each sub-4x4 block #i sum is stored in dc[i]. VP8MeanMetric; extern VP8MeanMetric VP8Mean16x4; VP8BlockCopy; extern VP8BlockCopy VP8Copy4x4; extern VP8BlockCopy VP8Copy16x8; // Quantization struct VP8Matrix; // forward declaration VP8QuantizeBlock; // Same as VP8QuantizeBlock, but quantizes two consecutive blocks. VP8Quantize2Blocks; extern VP8QuantizeBlock VP8EncQuantizeBlock; extern VP8Quantize2Blocks VP8EncQuantize2Blocks; // specific to 2nd transform: VP8QuantizeBlockWHT; extern VP8QuantizeBlockWHT VP8EncQuantizeBlockWHT; extern const int VP8DspScan[16 + 4 + 4]; // Collect histogram for susceptibility calculation. #define MAX_COEFF_THRESH … VP8Histogram; VP8CHisto; extern VP8CHisto VP8CollectHistogram; // General-purpose util function to help VP8CollectHistogram(). void VP8SetHistogramData(const int distribution[MAX_COEFF_THRESH + 1], VP8Histogram* const histo); // must be called before using any of the above void VP8EncDspInit(void); //------------------------------------------------------------------------------ // cost functions (encoding) extern const uint16_t VP8EntropyCost[256]; // 8bit fixed-point log(p) // approximate cost per level: extern const uint16_t VP8LevelFixedCosts[2047 /*MAX_LEVEL*/ + 1]; extern const uint8_t VP8EncBands[16 + 1]; struct VP8Residual; VP8SetResidualCoeffsFunc; extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs; // Cost calculation function. VP8GetResidualCostFunc; extern VP8GetResidualCostFunc VP8GetResidualCost; // must be called before anything using the above void VP8EncDspCostInit(void); //------------------------------------------------------------------------------ // SSIM / PSNR utils // struct for accumulating statistical moments VP8DistoStats; // Compute the final SSIM value // The non-clipped version assumes stats->w = (2 * VP8_SSIM_KERNEL + 1)^2. double VP8SSIMFromStats(const VP8DistoStats* const stats); double VP8SSIMFromStatsClipped(const VP8DistoStats* const stats); #define VP8_SSIM_KERNEL … VP8SSIMGetClippedFunc; // plane dimension #if !defined(WEBP_REDUCE_SIZE) // This version is called with the guarantee that you can load 8 bytes and // 8 rows at offset src1 and src2 VP8SSIMGetFunc; extern VP8SSIMGetFunc VP8SSIMGet; // unclipped / unchecked extern VP8SSIMGetClippedFunc VP8SSIMGetClipped; // with clipping #endif #if !defined(WEBP_DISABLE_STATS) VP8AccumulateSSEFunc; extern VP8AccumulateSSEFunc VP8AccumulateSSE; #endif // must be called before using any of the above directly void VP8SSIMDspInit(void); //------------------------------------------------------------------------------ // Decoding VP8DecIdct; // when doing two transforms, coeffs is actually int16_t[2][16]. VP8DecIdct2; extern VP8DecIdct2 VP8Transform; extern VP8DecIdct VP8TransformAC3; extern VP8DecIdct VP8TransformUV; extern VP8DecIdct VP8TransformDC; extern VP8DecIdct VP8TransformDCUV; extern VP8WHT VP8TransformWHT; #define WEBP_TRANSFORM_AC3_C1 … #define WEBP_TRANSFORM_AC3_C2 … #define WEBP_TRANSFORM_AC3_MUL1(a) … #define WEBP_TRANSFORM_AC3_MUL2(a) … // *dst is the destination block, with stride BPS. Boundary samples are // assumed accessible when needed. VP8PredFunc; extern VP8PredFunc VP8PredLuma16[/* NUM_B_DC_MODES */]; extern VP8PredFunc VP8PredChroma8[/* NUM_B_DC_MODES */]; extern VP8PredFunc VP8PredLuma4[/* NUM_BMODES */]; // clipping tables (for filtering) extern const int8_t* const VP8ksclip1; // clips [-1020, 1020] to [-128, 127] extern const int8_t* const VP8ksclip2; // clips [-112, 112] to [-16, 15] extern const uint8_t* const VP8kclip1; // clips [-255,511] to [0,255] extern const uint8_t* const VP8kabs0; // abs(x) for x in [-255,255] // must be called first void VP8InitClipTables(void); // simple filter (only for luma) VP8SimpleFilterFunc; extern VP8SimpleFilterFunc VP8SimpleVFilter16; extern VP8SimpleFilterFunc VP8SimpleHFilter16; extern VP8SimpleFilterFunc VP8SimpleVFilter16i; // filter 3 inner edges extern VP8SimpleFilterFunc VP8SimpleHFilter16i; // regular filter (on both macroblock edges and inner edges) VP8LumaFilterFunc; VP8ChromaFilterFunc; // on outer edge extern VP8LumaFilterFunc VP8VFilter16; extern VP8LumaFilterFunc VP8HFilter16; extern VP8ChromaFilterFunc VP8VFilter8; extern VP8ChromaFilterFunc VP8HFilter8; // on inner edge extern VP8LumaFilterFunc VP8VFilter16i; // filtering 3 inner edges altogether extern VP8LumaFilterFunc VP8HFilter16i; extern VP8ChromaFilterFunc VP8VFilter8i; // filtering u and v altogether extern VP8ChromaFilterFunc VP8HFilter8i; // Dithering. Combines dithering values (centered around 128) with dst[], // according to: dst[] = clip(dst[] + (((dither[]-128) + 8) >> 4) #define VP8_DITHER_DESCALE … #define VP8_DITHER_DESCALE_ROUNDER … #define VP8_DITHER_AMP_BITS … #define VP8_DITHER_AMP_CENTER … extern void (*VP8DitherCombine8x8)(const uint8_t* dither, uint8_t* dst, int dst_stride); // must be called before anything using the above void VP8DspInit(void); //------------------------------------------------------------------------------ // WebP I/O #define FANCY_UPSAMPLING … // Convert a pair of y/u/v lines together to the output rgb/a colorspace. // bottom_y can be NULL if only one line of output is needed (at top/bottom). WebPUpsampleLinePairFunc; #ifdef FANCY_UPSAMPLING // Fancy upsampling functions to convert YUV to RGB(A) modes extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */]; #endif // FANCY_UPSAMPLING // Per-row point-sampling methods. WebPSamplerRowFunc; // Generic function to apply 'WebPSamplerRowFunc' to the whole plane: void WebPSamplerProcessPlane(const uint8_t* y, int y_stride, const uint8_t* u, const uint8_t* v, int uv_stride, uint8_t* dst, int dst_stride, int width, int height, WebPSamplerRowFunc func); // Sampling functions to convert rows of YUV to RGB(A) extern WebPSamplerRowFunc WebPSamplers[/* MODE_LAST */]; // General function for converting two lines of ARGB or RGBA. // 'alpha_is_last' should be true if 0xff000000 is stored in memory as // as 0x00, 0x00, 0x00, 0xff (little endian). WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last); // YUV444->RGB converters WebPYUV444Converter; extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */]; // Must be called before using the WebPUpsamplers[] (and for premultiplied // colorspaces like rgbA, rgbA4444, etc) void WebPInitUpsamplers(void); // Must be called before using WebPSamplers[] void WebPInitSamplers(void); // Must be called before using WebPYUV444Converters[] void WebPInitYUV444Converters(void); //------------------------------------------------------------------------------ // ARGB -> YUV converters // Convert ARGB samples to luma Y. extern void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width); // Convert ARGB samples to U/V with downsampling. do_store should be '1' for // even lines and '0' for odd ones. 'src_width' is the original width, not // the U/V one. extern void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v, int src_width, int do_store); // Convert a row of accumulated (four-values) of rgba32 toward U/V extern void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb, uint8_t* u, uint8_t* v, int width); // Convert RGB or BGR to Y extern void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width); extern void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width); // used for plain-C fallback. extern void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v, int src_width, int do_store); extern void WebPConvertRGBA32ToUV_C(const uint16_t* rgb, uint8_t* u, uint8_t* v, int width); // Must be called before using the above. void WebPInitConvertARGBToYUV(void); //------------------------------------------------------------------------------ // Rescaler struct WebPRescaler; // Import a row of data and save its contribution in the rescaler. // 'channel' denotes the channel number to be imported. 'Expand' corresponds to // the wrk->x_expand case. Otherwise, 'Shrink' is to be used. WebPRescalerImportRowFunc; extern WebPRescalerImportRowFunc WebPRescalerImportRowExpand; extern WebPRescalerImportRowFunc WebPRescalerImportRowShrink; // Export one row (starting at x_out position) from rescaler. // 'Expand' corresponds to the wrk->y_expand case. // Otherwise 'Shrink' is to be used WebPRescalerExportRowFunc; extern WebPRescalerExportRowFunc WebPRescalerExportRowExpand; extern WebPRescalerExportRowFunc WebPRescalerExportRowShrink; // Plain-C implementation, as fall-back. extern void WebPRescalerImportRowExpand_C(struct WebPRescaler* const wrk, const uint8_t* src); extern void WebPRescalerImportRowShrink_C(struct WebPRescaler* const wrk, const uint8_t* src); extern void WebPRescalerExportRowExpand_C(struct WebPRescaler* const wrk); extern void WebPRescalerExportRowShrink_C(struct WebPRescaler* const wrk); // Main entry calls: extern void WebPRescalerImportRow(struct WebPRescaler* const wrk, const uint8_t* src); // Export one row (starting at x_out position) from rescaler. extern void WebPRescalerExportRow(struct WebPRescaler* const wrk); // Must be called first before using the above. void WebPRescalerDspInit(void); //------------------------------------------------------------------------------ // Utilities for processing transparent channel. // Apply alpha pre-multiply on an rgba, bgra or argb plane of size w * h. // alpha_first should be 0 for argb, 1 for rgba or bgra (where alpha is last). extern void (*WebPApplyAlphaMultiply)( uint8_t* rgba, int alpha_first, int w, int h, int stride); // Same, buf specifically for RGBA4444 format extern void (*WebPApplyAlphaMultiply4444)( uint8_t* rgba4444, int w, int h, int stride); // Dispatch the values from alpha[] plane to the ARGB destination 'dst'. // Returns true if alpha[] plane has non-trivial values different from 0xff. extern int (*WebPDispatchAlpha)(const uint8_t* WEBP_RESTRICT alpha, int alpha_stride, int width, int height, uint8_t* WEBP_RESTRICT dst, int dst_stride); // Transfer packed 8b alpha[] values to green channel in dst[], zero'ing the // A/R/B values. 'dst_stride' is the stride for dst[] in uint32_t units. extern void (*WebPDispatchAlphaToGreen)(const uint8_t* WEBP_RESTRICT alpha, int alpha_stride, int width, int height, uint32_t* WEBP_RESTRICT dst, int dst_stride); // Extract the alpha values from 32b values in argb[] and pack them into alpha[] // (this is the opposite of WebPDispatchAlpha). // Returns true if there's only trivial 0xff alpha values. extern int (*WebPExtractAlpha)(const uint8_t* WEBP_RESTRICT argb, int argb_stride, int width, int height, uint8_t* WEBP_RESTRICT alpha, int alpha_stride); // Extract the green values from 32b values in argb[] and pack them into alpha[] // (this is the opposite of WebPDispatchAlphaToGreen). extern void (*WebPExtractGreen)(const uint32_t* WEBP_RESTRICT argb, uint8_t* WEBP_RESTRICT alpha, int size); // Pre-Multiply operation transforms x into x * A / 255 (where x=Y,R,G or B). // Un-Multiply operation transforms x into x * 255 / A. // Pre-Multiply or Un-Multiply (if 'inverse' is true) argb values in a row. extern void (*WebPMultARGBRow)(uint32_t* const ptr, int width, int inverse); // Same a WebPMultARGBRow(), but for several rows. void WebPMultARGBRows(uint8_t* ptr, int stride, int width, int num_rows, int inverse); // Same for a row of single values, with side alpha values. extern void (*WebPMultRow)(uint8_t* WEBP_RESTRICT const ptr, const uint8_t* WEBP_RESTRICT const alpha, int width, int inverse); // Same a WebPMultRow(), but for several 'num_rows' rows. void WebPMultRows(uint8_t* WEBP_RESTRICT ptr, int stride, const uint8_t* WEBP_RESTRICT alpha, int alpha_stride, int width, int num_rows, int inverse); // Plain-C versions, used as fallback by some implementations. void WebPMultRow_C(uint8_t* WEBP_RESTRICT const ptr, const uint8_t* WEBP_RESTRICT const alpha, int width, int inverse); void WebPMultARGBRow_C(uint32_t* const ptr, int width, int inverse); #ifdef WORDS_BIGENDIAN // ARGB packing function: a/r/g/b input is rgba or bgra order. extern void (*WebPPackARGB)(const uint8_t* WEBP_RESTRICT a, const uint8_t* WEBP_RESTRICT r, const uint8_t* WEBP_RESTRICT g, const uint8_t* WEBP_RESTRICT b, int len, uint32_t* WEBP_RESTRICT out); #endif // RGB packing function. 'step' can be 3 or 4. r/g/b input is rgb or bgr order. extern void (*WebPPackRGB)(const uint8_t* WEBP_RESTRICT r, const uint8_t* WEBP_RESTRICT g, const uint8_t* WEBP_RESTRICT b, int len, int step, uint32_t* WEBP_RESTRICT out); // This function returns true if src[i] contains a value different from 0xff. extern int (*WebPHasAlpha8b)(const uint8_t* src, int length); // This function returns true if src[4*i] contains a value different from 0xff. extern int (*WebPHasAlpha32b)(const uint8_t* src, int length); // replaces transparent values in src[] by 'color'. extern void (*WebPAlphaReplace)(uint32_t* src, int length, uint32_t color); // To be called first before using the above. void WebPInitAlphaProcessing(void); //------------------------------------------------------------------------------ // Filter functions WEBP_FILTER_TYPE; WebPFilterFunc; // In-place un-filtering. // Warning! 'prev_line' pointer can be equal to 'cur_line' or 'preds'. WebPUnfilterFunc; // Filter the given data using the given predictor. // 'in' corresponds to a 2-dimensional pixel array of size (stride * height) // in raster order. // 'stride' is number of bytes per scan line (with possible padding). // 'out' should be pre-allocated. extern WebPFilterFunc WebPFilters[WEBP_FILTER_LAST]; // In-place reconstruct the original data from the given filtered data. // The reconstruction will be done for 'num_rows' rows starting from 'row' // (assuming rows upto 'row - 1' are already reconstructed). extern WebPUnfilterFunc WebPUnfilters[WEBP_FILTER_LAST]; // To be called first before using the above. void VP8FiltersInit(void); #ifdef __cplusplus } // extern "C" #endif #endif // WEBP_DSP_DSP_H_
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