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// 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 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_
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