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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.
// -----------------------------------------------------------------------------
// Lossless encoder: internal header.
// Author: Vikas Arora (
#ifndef WEBP_ENC_VP8LI_H_
#define WEBP_ENC_VP8LI_H_
#include "./histogram.h"
#include "../utils/bit_writer.h"
#include "../webp/encode.h"
#include "../webp/format_constants.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
typedef struct {
const WebPConfig* config_; // user configuration and parameters
const WebPPicture* pic_; // input picture.
uint32_t* argb_; // Transformed argb image data.
uint32_t* argb_scratch_; // Scratch memory for argb rows
// (used for prediction).
uint32_t* transform_data_; // Scratch memory for transform data.
int current_width_; // Corresponds to packed image width.
// Encoding parameters derived from quality parameter.
int histo_bits_;
int transform_bits_;
int cache_bits_; // If equal to 0, don't use color cache.
// Encoding parameters derived from image characteristics.
int use_cross_color_;
int use_subtract_green_;
int use_predict_;
int use_palette_;
int palette_size_;
uint32_t palette_[MAX_PALETTE_SIZE];
} VP8LEncoder;
// internal functions. Not public.
// Encodes the picture.
// Returns 0 if config or picture is NULL or picture doesn't have valid argb
// input.
int VP8LEncodeImage(const WebPConfig* const config,
const WebPPicture* const picture);
// Encodes the main image stream using the supplied bit writer.
WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
const WebPPicture* const picture,
VP8LBitWriter* const bw);
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif /* WEBP_ENC_VP8LI_H_ */