| // 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 (pascal.massimino@gmail.com) |
| |
| #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 32 // this is the common stride for enc/dec |
| |
| //------------------------------------------------------------------------------ |
| // 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 __restrict__ |
| #elif defined(_MSC_VER) |
| #define WEBP_RESTRICT __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) \ |
| extern void func(void); \ |
| void func(void) {} |
| |
| //------------------------------------------------------------------------------ |
| // 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). |
| typedef void (*VP8Idct)(const uint8_t* ref, const int16_t* in, uint8_t* dst, |
| int do_two); |
| typedef void (*VP8Fdct)(const uint8_t* src, const uint8_t* ref, int16_t* out); |
| typedef void (*VP8WHT)(const int16_t* in, int16_t* out); |
| 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. |
| typedef void (*VP8IntraPreds)(uint8_t* dst, const uint8_t* left, |
| const uint8_t* top); |
| typedef void (*VP8Intra4Preds)(uint8_t* dst, const uint8_t* top); |
| extern VP8Intra4Preds VP8EncPredLuma4; |
| extern VP8IntraPreds VP8EncPredLuma16; |
| extern VP8IntraPreds VP8EncPredChroma8; |
| |
| typedef int (*VP8Metric)(const uint8_t* pix, const uint8_t* ref); |
| extern VP8Metric VP8SSE16x16, VP8SSE16x8, VP8SSE8x8, VP8SSE4x4; |
| typedef int (*VP8WMetric)(const uint8_t* pix, const uint8_t* ref, |
| const uint16_t* const weights); |
| // 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]. |
| typedef void (*VP8MeanMetric)(const uint8_t* ref, uint32_t dc[4]); |
| extern VP8MeanMetric VP8Mean16x4; |
| |
| typedef void (*VP8BlockCopy)(const uint8_t* src, uint8_t* dst); |
| extern VP8BlockCopy VP8Copy4x4; |
| extern VP8BlockCopy VP8Copy16x8; |
| // Quantization |
| struct VP8Matrix; // forward declaration |
| typedef int (*VP8QuantizeBlock)(int16_t in[16], int16_t out[16], |
| const struct VP8Matrix* const mtx); |
| // Same as VP8QuantizeBlock, but quantizes two consecutive blocks. |
| typedef int (*VP8Quantize2Blocks)(int16_t in[32], int16_t out[32], |
| const struct VP8Matrix* const mtx); |
| |
| extern VP8QuantizeBlock VP8EncQuantizeBlock; |
| extern VP8Quantize2Blocks VP8EncQuantize2Blocks; |
| |
| // specific to 2nd transform: |
| typedef int (*VP8QuantizeBlockWHT)(int16_t in[16], int16_t out[16], |
| const struct VP8Matrix* const mtx); |
| extern VP8QuantizeBlockWHT VP8EncQuantizeBlockWHT; |
| |
| extern const int VP8DspScan[16 + 4 + 4]; |
| |
| // Collect histogram for susceptibility calculation. |
| #define MAX_COEFF_THRESH 31 // size of histogram used by CollectHistogram. |
| typedef struct { |
| // We only need to store max_value and last_non_zero, not the distribution. |
| int max_value; |
| int last_non_zero; |
| } VP8Histogram; |
| typedef void (*VP8CHisto)(const uint8_t* ref, const uint8_t* pred, |
| int start_block, int end_block, |
| VP8Histogram* const histo); |
| 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; |
| typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs, |
| struct VP8Residual* const res); |
| extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs; |
| |
| // Cost calculation function. |
| typedef int (*VP8GetResidualCostFunc)(int ctx0, |
| const struct VP8Residual* const res); |
| extern VP8GetResidualCostFunc VP8GetResidualCost; |
| |
| // must be called before anything using the above |
| void VP8EncDspCostInit(void); |
| |
| //------------------------------------------------------------------------------ |
| // SSIM / PSNR utils |
| |
| // struct for accumulating statistical moments |
| typedef struct { |
| uint32_t w; // sum(w_i) : sum of weights |
| uint32_t xm, ym; // sum(w_i * x_i), sum(w_i * y_i) |
| uint32_t xxm, xym, yym; // sum(w_i * x_i * x_i), etc. |
| } 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 3 // total size of the kernel: 2 * VP8_SSIM_KERNEL + 1 |
| typedef double (*VP8SSIMGetClippedFunc)(const uint8_t* src1, int stride1, |
| const uint8_t* src2, int stride2, |
| int xo, int yo, // center position |
| int W, int H); // 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 |
| typedef double (*VP8SSIMGetFunc)(const uint8_t* src1, int stride1, |
| const uint8_t* src2, int stride2); |
| |
| extern VP8SSIMGetFunc VP8SSIMGet; // unclipped / unchecked |
| extern VP8SSIMGetClippedFunc VP8SSIMGetClipped; // with clipping |
| #endif |
| |
| #if !defined(WEBP_DISABLE_STATS) |
| typedef uint32_t (*VP8AccumulateSSEFunc)(const uint8_t* src1, |
| const uint8_t* src2, int len); |
| extern VP8AccumulateSSEFunc VP8AccumulateSSE; |
| #endif |
| |
| // must be called before using any of the above directly |
| void VP8SSIMDspInit(void); |
| |
| //------------------------------------------------------------------------------ |
| // Decoding |
| |
| typedef void (*VP8DecIdct)(const int16_t* coeffs, uint8_t* dst); |
| // when doing two transforms, coeffs is actually int16_t[2][16]. |
| typedef void (*VP8DecIdct2)(const int16_t* coeffs, uint8_t* dst, int do_two); |
| extern VP8DecIdct2 VP8Transform; |
| extern VP8DecIdct VP8TransformAC3; |
| extern VP8DecIdct VP8TransformUV; |
| extern VP8DecIdct VP8TransformDC; |
| extern VP8DecIdct VP8TransformDCUV; |
| extern VP8WHT VP8TransformWHT; |
| |
| // *dst is the destination block, with stride BPS. Boundary samples are |
| // assumed accessible when needed. |
| typedef void (*VP8PredFunc)(uint8_t* dst); |
| 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) |
| typedef void (*VP8SimpleFilterFunc)(uint8_t* p, int stride, int thresh); |
| 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) |
| typedef void (*VP8LumaFilterFunc)(uint8_t* luma, int stride, |
| int thresh, int ithresh, int hev_t); |
| typedef void (*VP8ChromaFilterFunc)(uint8_t* u, uint8_t* v, int stride, |
| int thresh, int ithresh, int hev_t); |
| // 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 4 |
| #define VP8_DITHER_DESCALE_ROUNDER (1 << (VP8_DITHER_DESCALE - 1)) |
| #define VP8_DITHER_AMP_BITS 7 |
| #define VP8_DITHER_AMP_CENTER (1 << VP8_DITHER_AMP_BITS) |
| 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 // undefined to remove fancy upsampling support |
| |
| // 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). |
| typedef void (*WebPUpsampleLinePairFunc)( |
| const uint8_t* top_y, const uint8_t* bottom_y, |
| const uint8_t* top_u, const uint8_t* top_v, |
| const uint8_t* cur_u, const uint8_t* cur_v, |
| uint8_t* top_dst, uint8_t* bottom_dst, int len); |
| |
| #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. |
| typedef void (*WebPSamplerRowFunc)(const uint8_t* y, |
| const uint8_t* u, const uint8_t* v, |
| uint8_t* dst, int len); |
| // 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 |
| typedef void (*WebPYUV444Converter)(const uint8_t* y, |
| const uint8_t* u, const uint8_t* v, |
| uint8_t* dst, int len); |
| |
| 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. |
| typedef void (*WebPRescalerImportRowFunc)(struct WebPRescaler* const wrk, |
| const uint8_t* src); |
| |
| 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 |
| typedef void (*WebPRescalerExportRowFunc)(struct WebPRescaler* const wrk); |
| 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 |
| |
| typedef enum { // Filter types. |
| WEBP_FILTER_NONE = 0, |
| WEBP_FILTER_HORIZONTAL, |
| WEBP_FILTER_VERTICAL, |
| WEBP_FILTER_GRADIENT, |
| WEBP_FILTER_LAST = WEBP_FILTER_GRADIENT + 1, // end marker |
| WEBP_FILTER_BEST, // meta-types |
| WEBP_FILTER_FAST |
| } WEBP_FILTER_TYPE; |
| |
| typedef void (*WebPFilterFunc)(const uint8_t* in, int width, int height, |
| int stride, uint8_t* out); |
| // In-place un-filtering. |
| // Warning! 'prev_line' pointer can be equal to 'cur_line' or 'preds'. |
| typedef void (*WebPUnfilterFunc)(const uint8_t* prev_line, const uint8_t* preds, |
| uint8_t* cur_line, int width); |
| |
| // 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_ |
