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Diffstat (limited to 'media/libwebp/src/dsp/lossless.h')
| -rw-r--r-- | media/libwebp/src/dsp/lossless.h | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/media/libwebp/src/dsp/lossless.h b/media/libwebp/src/dsp/lossless.h new file mode 100644 index 0000000000..f709cc86b2 --- /dev/null +++ b/media/libwebp/src/dsp/lossless.h @@ -0,0 +1,229 @@ +// 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 "src/webp/types.h" +#include "src/webp/decode.h" + +#include "src/enc/histogram_enc.h" +#include "src/utils/utils.h" + +#ifdef __cplusplus +extern "C" { +#endif + +//------------------------------------------------------------------------------ +// 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* 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 streak, 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 (*VP8LAddVectorFunc)(const uint32_t* a, const uint32_t* b, + uint32_t* out, int size); +extern VP8LAddVectorFunc VP8LAddVector; +typedef void (*VP8LAddVectorEqFunc)(const uint32_t* a, uint32_t* out, int size); +extern VP8LAddVectorEqFunc VP8LAddVectorEq; +void VP8LHistogramAdd(const VP8LHistogram* const a, + const VP8LHistogram* const b, + VP8LHistogram* const out); + +// ----------------------------------------------------------------------------- +// 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_ |