| // 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_ENC_H_ |
| #define WEBP_ENC_VP8LI_ENC_H_ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "src/webp/config.h" |
| #endif |
| // Either WEBP_NEAR_LOSSLESS is defined as 0 in config.h when compiling to |
| // disable near-lossless, or it is enabled by default. |
| #ifndef WEBP_NEAR_LOSSLESS |
| #define WEBP_NEAR_LOSSLESS 1 |
| #endif |
| |
| #include "src/enc/backward_references_enc.h" |
| #include "src/enc/histogram_enc.h" |
| #include "src/utils/bit_writer_utils.h" |
| #include "src/webp/encode.h" |
| #include "src/webp/format_constants.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| // maximum value of transform_bits_ in VP8LEncoder. |
| #define MAX_TRANSFORM_BITS 6 |
| |
| typedef enum { |
| kEncoderNone = 0, |
| kEncoderARGB, |
| kEncoderNearLossless, |
| kEncoderPalette |
| } VP8LEncoderARGBContent; |
| |
| typedef struct { |
| const WebPConfig* config_; // user configuration and parameters |
| const WebPPicture* pic_; // input picture. |
| |
| uint32_t* argb_; // Transformed argb image data. |
| VP8LEncoderARGBContent argb_content_; // Content type of the argb buffer. |
| uint32_t* argb_scratch_; // Scratch memory for argb rows |
| // (used for prediction). |
| uint32_t* transform_data_; // Scratch memory for transform data. |
| uint32_t* transform_mem_; // Currently allocated memory. |
| size_t transform_mem_size_; // Currently allocated memory size. |
| |
| int current_width_; // Corresponds to packed image width. |
| |
| // Encoding parameters derived from quality parameter. |
| int histo_bits_; |
| int transform_bits_; // <= MAX_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_[3]; // Backward Refs array for temporaries. |
| 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. |
| // If 'use_cache' is false, disables the use of color cache. |
| WebPEncodingError VP8LEncodeStream(const WebPConfig* const config, |
| const WebPPicture* const picture, |
| VP8LBitWriter* const bw, int use_cache); |
| |
| #if (WEBP_NEAR_LOSSLESS == 1) |
| // in near_lossless.c |
| // Near lossless preprocessing in RGB color-space. |
| int VP8ApplyNearLossless(const WebPPicture* const picture, int quality, |
| uint32_t* const argb_dst); |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| // Image transforms in predictor.c. |
| |
| void VP8LResidualImage(int width, int height, int bits, int low_effort, |
| uint32_t* const argb, uint32_t* const argb_scratch, |
| uint32_t* const image, int near_lossless, int exact, |
| int used_subtract_green); |
| |
| void VP8LColorSpaceTransform(int width, int height, int bits, int quality, |
| uint32_t* const argb, uint32_t* image); |
| |
| //------------------------------------------------------------------------------ |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif /* WEBP_ENC_VP8LI_ENC_H_ */ |