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libwebp interface changes for lossless encoding.

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Change-Id: I703a1a18347acf78378cb23fddc6e5ca6dc6a0bb
This commit is contained in:
Vikas Arora
2012-03-28 11:07:42 +00:00
committed by James Zern
parent c04eb7be9d
commit 227110c4c3
8 changed files with 648 additions and 158 deletions
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src/enc/vp8li.h Normal file
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// Copyright 2012 Google Inc. All Rights Reserved.
//
// This code is licensed under the same terms as WebM:
// Software License Agreement: http://www.webmproject.org/license/software/
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// Lossless encoder: internal header.
//
// Author: Vikas Arora(vikaas.arora@gmail.com)
#ifndef WEBP_ENC_VP8LI_H_
#define WEBP_ENC_VP8LI_H_
#include "../webp/encode.h"
#include "../utils/bit_writer.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
// TODO(vikasa): factorize these with ones used in lossless decoder.
#define TAG_SIZE 4
#define CHUNK_HEADER_SIZE 8
#define RIFF_HEADER_SIZE 12
#define HEADER_SIZE (RIFF_HEADER_SIZE + CHUNK_HEADER_SIZE)
#define SIGNATURE_SIZE 1
#define LOSSLESS_MAGIC_BYTE 0x64
typedef struct {
const WebPConfig* config_; // user configuration and parameters
WebPPicture* pic_; // input / output picture
// Encoding parameters derived from quality parameter.
int use_lz77_;
int palette_bits_;
int histo_bits_;
int transform_bits_;
// Encoding parameters derived from image characteristics.
int predicted_bits_;
int non_predicted_bits_;
int use_palette_;
int num_palette_colors;
int use_predict_;
int use_cross_color_;
int use_emerging_palette_;
VP8LBitWriter bw_;
} VP8LEncoder;
//------------------------------------------------------------------------------
// internal functions. Not public.
// in vp8l.c
// 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,
WebPPicture* const picture);
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
#endif /* WEBP_ENC_VP8LI_H_ */