// Copyright 2012 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. // ----------------------------------------------------------------------------- // // Image transforms and color space conversion methods for lossless decoder. // // Authors: Vikas Arora (vikaas.arora@gmail.com) // Jyrki Alakuijala (jyrki@google.com) #ifndef WEBP_DSP_LOSSLESS_H_ #define WEBP_DSP_LOSSLESS_H_ #include "../webp/types.h" #include "../webp/decode.h" #include "../enc/histogram_enc.h" #include "../utils/utils.h" #ifdef __cplusplus extern "C" { #endif #ifdef WEBP_EXPERIMENTAL_FEATURES #include "../enc/delta_palettization_enc.h" #endif // WEBP_EXPERIMENTAL_FEATURES //------------------------------------------------------------------------------ // Decoding typedef uint32_t (*VP8LPredictorFunc)(uint32_t left, const uint32_t* const top); extern VP8LPredictorFunc VP8LPredictors[16]; extern VP8LPredictorFunc VP8LPredictors_C[16]; // These Add/Sub function expects upper[-1] and out[-1] to be readable. typedef void (*VP8LPredictorAddSubFunc)(const uint32_t* in, const uint32_t* upper, int num_pixels, uint32_t* out); extern VP8LPredictorAddSubFunc VP8LPredictorsAdd[16]; extern VP8LPredictorAddSubFunc VP8LPredictorsAdd_C[16]; typedef void (*VP8LProcessDecBlueAndRedFunc)(const uint32_t* src, int num_pixels, uint32_t* dst); extern VP8LProcessDecBlueAndRedFunc VP8LAddGreenToBlueAndRed; typedef struct { // Note: the members are uint8_t, so that any negative values are // automatically converted to "mod 256" values. uint8_t green_to_red_; uint8_t green_to_blue_; uint8_t red_to_blue_; } VP8LMultipliers; typedef void (*VP8LTransformColorInverseFunc)(const VP8LMultipliers* const m, const uint32_t* src, int num_pixels, uint32_t* dst); extern VP8LTransformColorInverseFunc VP8LTransformColorInverse; struct VP8LTransform; // Defined in dec/vp8li.h. // Performs inverse transform of data given transform information, start and end // rows. Transform will be applied to rows [row_start, row_end[. // The *in and *out pointers refer to source and destination data respectively // corresponding to the intermediate row (row_start). void VP8LInverseTransform(const struct VP8LTransform* const transform, int row_start, int row_end, const uint32_t* const in, uint32_t* const out); // Color space conversion. typedef void (*VP8LConvertFunc)(const uint32_t* src, int num_pixels, uint8_t* dst); extern VP8LConvertFunc VP8LConvertBGRAToRGB; extern VP8LConvertFunc VP8LConvertBGRAToRGBA; extern VP8LConvertFunc VP8LConvertBGRAToRGBA4444; extern VP8LConvertFunc VP8LConvertBGRAToRGB565; extern VP8LConvertFunc VP8LConvertBGRAToBGR; // Converts from BGRA to other color spaces. void VP8LConvertFromBGRA(const uint32_t* const in_data, int num_pixels, WEBP_CSP_MODE out_colorspace, uint8_t* const rgba); typedef void (*VP8LMapARGBFunc)(const uint32_t* src, const uint32_t* const color_map, uint32_t* dst, int y_start, int y_end, int width); typedef void (*VP8LMapAlphaFunc)(const uint8_t* src, const uint32_t* const color_map, uint8_t* dst, int y_start, int y_end, int width); extern VP8LMapARGBFunc VP8LMapColor32b; extern VP8LMapAlphaFunc VP8LMapColor8b; // Similar to the static method ColorIndexInverseTransform() that is part of // lossless.c, but used only for alpha decoding. It takes uint8_t (rather than // uint32_t) arguments for 'src' and 'dst'. void VP8LColorIndexInverseTransformAlpha( const struct VP8LTransform* const transform, int y_start, int y_end, const uint8_t* src, uint8_t* dst); // Expose some C-only fallback functions void VP8LTransformColorInverse_C(const VP8LMultipliers* const m, const uint32_t* src, int num_pixels, uint32_t* dst); void VP8LConvertBGRAToRGB_C(const uint32_t* src, int num_pixels, uint8_t* dst); void VP8LConvertBGRAToRGBA_C(const uint32_t* src, int num_pixels, uint8_t* dst); void VP8LConvertBGRAToRGBA4444_C(const uint32_t* src, int num_pixels, uint8_t* dst); void VP8LConvertBGRAToRGB565_C(const uint32_t* src, int num_pixels, uint8_t* dst); void VP8LConvertBGRAToBGR_C(const uint32_t* src, int num_pixels, uint8_t* dst); void VP8LAddGreenToBlueAndRed_C(const uint32_t* src, int num_pixels, uint32_t* dst); // Must be called before calling any of the above methods. void VP8LDspInit(void); //------------------------------------------------------------------------------ // Encoding typedef void (*VP8LProcessEncBlueAndRedFunc)(uint32_t* dst, int num_pixels); extern VP8LProcessEncBlueAndRedFunc VP8LSubtractGreenFromBlueAndRed; typedef void (*VP8LTransformColorFunc)(const VP8LMultipliers* const m, uint32_t* const dst, int num_pixels); extern VP8LTransformColorFunc VP8LTransformColor; typedef void (*VP8LCollectColorBlueTransformsFunc)( const uint32_t* argb, int stride, int tile_width, int tile_height, int green_to_blue, int red_to_blue, int histo[]); extern VP8LCollectColorBlueTransformsFunc VP8LCollectColorBlueTransforms; typedef void (*VP8LCollectColorRedTransformsFunc)( const uint32_t* argb, int stride, int tile_width, int tile_height, int green_to_red, int histo[]); extern VP8LCollectColorRedTransformsFunc VP8LCollectColorRedTransforms; // Expose some C-only fallback functions void VP8LTransformColor_C(const VP8LMultipliers* const m, uint32_t* data, int num_pixels); void VP8LSubtractGreenFromBlueAndRed_C(uint32_t* argb_data, int num_pixels); void VP8LCollectColorRedTransforms_C(const uint32_t* argb, int stride, int tile_width, int tile_height, int green_to_red, int histo[]); void VP8LCollectColorBlueTransforms_C(const uint32_t* argb, int stride, int tile_width, int tile_height, int green_to_blue, int red_to_blue, int histo[]); extern VP8LPredictorAddSubFunc VP8LPredictorsSub[16]; extern VP8LPredictorAddSubFunc VP8LPredictorsSub_C[16]; // ----------------------------------------------------------------------------- // Huffman-cost related functions. typedef double (*VP8LCostFunc)(const uint32_t* population, int length); typedef double (*VP8LCostCombinedFunc)(const uint32_t* X, const uint32_t* Y, int length); typedef float (*VP8LCombinedShannonEntropyFunc)(const int X[256], const int Y[256]); extern VP8LCostFunc VP8LExtraCost; extern VP8LCostCombinedFunc VP8LExtraCostCombined; extern VP8LCombinedShannonEntropyFunc VP8LCombinedShannonEntropy; typedef struct { // small struct to hold counters int counts[2]; // index: 0=zero steak, 1=non-zero streak int streaks[2][2]; // [zero/non-zero][streak<3 / streak>=3] } VP8LStreaks; typedef struct { // small struct to hold bit entropy results double entropy; // entropy uint32_t sum; // sum of the population int nonzeros; // number of non-zero elements in the population uint32_t max_val; // maximum value in the population uint32_t nonzero_code; // index of the last non-zero in the population } VP8LBitEntropy; void VP8LBitEntropyInit(VP8LBitEntropy* const entropy); // Get the combined symbol bit entropy and Huffman cost stats for the // distributions 'X' and 'Y'. Those results can then be refined according to // codec specific heuristics. typedef void (*VP8LGetCombinedEntropyUnrefinedFunc)( const uint32_t X[], const uint32_t Y[], int length, VP8LBitEntropy* const bit_entropy, VP8LStreaks* const stats); extern VP8LGetCombinedEntropyUnrefinedFunc VP8LGetCombinedEntropyUnrefined; // Get the entropy for the distribution 'X'. typedef void (*VP8LGetEntropyUnrefinedFunc)(const uint32_t X[], int length, VP8LBitEntropy* const bit_entropy, VP8LStreaks* const stats); extern VP8LGetEntropyUnrefinedFunc VP8LGetEntropyUnrefined; void VP8LBitsEntropyUnrefined(const uint32_t* const array, int n, VP8LBitEntropy* const entropy); typedef void (*VP8LHistogramAddFunc)(const VP8LHistogram* const a, const VP8LHistogram* const b, VP8LHistogram* const out); extern VP8LHistogramAddFunc VP8LHistogramAdd; // ----------------------------------------------------------------------------- // PrefixEncode() typedef int (*VP8LVectorMismatchFunc)(const uint32_t* const array1, const uint32_t* const array2, int length); // Returns the first index where array1 and array2 are different. extern VP8LVectorMismatchFunc VP8LVectorMismatch; typedef void (*VP8LBundleColorMapFunc)(const uint8_t* const row, int width, int xbits, uint32_t* dst); extern VP8LBundleColorMapFunc VP8LBundleColorMap; void VP8LBundleColorMap_C(const uint8_t* const row, int width, int xbits, uint32_t* dst); // Must be called before calling any of the above methods. void VP8LEncDspInit(void); //------------------------------------------------------------------------------ #ifdef __cplusplus } // extern "C" #endif #endif // WEBP_DSP_LOSSLESS_H_