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