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Open Source Computer Vision Library
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96 lines
3.5 KiB
96 lines
3.5 KiB
8 years ago
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// 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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