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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 (vikaas.arora@gmail.com)
- #ifndef WEBP_ENC_VP8LI_H_
- #define WEBP_ENC_VP8LI_H_
- #include "./backward_references.h"
- #include "./histogram.h"
- #include "../utils/bit_writer.h"
- #include "../webp/encode.h"
- #include "../webp/format_constants.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- 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];
- // Some 'scratch' (potentially large) objects.
- struct VP8LBackwardRefs refs_[2]; // Backward Refs array corresponding to
- // LZ77 & RLE coding.
- VP8LHashChain hash_chain_; // HashChain data for constructing
- // backward references.
- } 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);
- //------------------------------------------------------------------------------
- #ifdef __cplusplus
- } // extern "C"
- #endif
- #endif /* WEBP_ENC_VP8LI_H_ */
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