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95 lines
3.5 KiB
95 lines
3.5 KiB
// 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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// Lossless encoder: internal header. |
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// |
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// Author: Vikas Arora (vikaas.arora@gmail.com) |
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#ifndef WEBP_ENC_VP8LI_H_ |
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#define WEBP_ENC_VP8LI_H_ |
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#include "./backward_references_enc.h" |
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#include "./histogram_enc.h" |
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#include "../utils/bit_writer_utils.h" |
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#include "../webp/encode.h" |
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#include "../webp/format_constants.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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// maximum value of transform_bits_ in VP8LEncoder. |
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#define MAX_TRANSFORM_BITS 6 |
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typedef struct { |
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const WebPConfig* config_; // user configuration and parameters |
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const WebPPicture* pic_; // input picture. |
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uint32_t* argb_; // Transformed argb image data. |
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uint32_t* argb_scratch_; // Scratch memory for argb rows |
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// (used for prediction). |
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uint32_t* transform_data_; // Scratch memory for transform data. |
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uint32_t* transform_mem_; // Currently allocated memory. |
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size_t transform_mem_size_; // Currently allocated memory size. |
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int current_width_; // Corresponds to packed image width. |
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// Encoding parameters derived from quality parameter. |
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int histo_bits_; |
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int transform_bits_; // <= MAX_TRANSFORM_BITS. |
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int cache_bits_; // If equal to 0, don't use color cache. |
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// Encoding parameters derived from image characteristics. |
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int use_cross_color_; |
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int use_subtract_green_; |
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int use_predict_; |
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int use_palette_; |
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int palette_size_; |
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uint32_t palette_[MAX_PALETTE_SIZE]; |
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// Some 'scratch' (potentially large) objects. |
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struct VP8LBackwardRefs refs_[2]; // Backward Refs array corresponding to |
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// LZ77 & RLE coding. |
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VP8LHashChain hash_chain_; // HashChain data for constructing |
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// backward references. |
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} VP8LEncoder; |
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//------------------------------------------------------------------------------ |
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// internal functions. Not public. |
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// Encodes the picture. |
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// Returns 0 if config or picture is NULL or picture doesn't have valid argb |
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// input. |
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int VP8LEncodeImage(const WebPConfig* const config, |
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const WebPPicture* const picture); |
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// Encodes the main image stream using the supplied bit writer. |
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// If 'use_cache' is false, disables the use of color cache. |
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WebPEncodingError VP8LEncodeStream(const WebPConfig* const config, |
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const WebPPicture* const picture, |
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VP8LBitWriter* const bw, int use_cache); |
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//------------------------------------------------------------------------------ |
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// Image transforms in predictor.c. |
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void VP8LResidualImage(int width, int height, int bits, int low_effort, |
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uint32_t* const argb, uint32_t* const argb_scratch, |
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uint32_t* const image, int near_lossless, int exact, |
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int used_subtract_green); |
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void VP8LColorSpaceTransform(int width, int height, int bits, int quality, |
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uint32_t* const argb, uint32_t* image); |
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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_ENC_VP8LI_H_ */
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