1 // Copyright 2012 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // Lossless encoder: internal header. 11 // 12 // Author: Vikas Arora (vikaas.arora@gmail.com) 13 14 #ifndef WEBP_ENC_VP8LI_H_ 15 #define WEBP_ENC_VP8LI_H_ 16 17 #include "./backward_references_enc.h" 18 #include "./histogram_enc.h" 19 #include "../utils/bit_writer_utils.h" 20 #include "../webp/encode.h" 21 #include "../webp/format_constants.h" 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 // maximum value of transform_bits_ in VP8LEncoder. 28 #define MAX_TRANSFORM_BITS 6 29 30 typedef struct { 31 const WebPConfig* config_; // user configuration and parameters 32 const WebPPicture* pic_; // input picture. 33 34 uint32_t* argb_; // Transformed argb image data. 35 uint32_t* argb_scratch_; // Scratch memory for argb rows 36 // (used for prediction). 37 uint32_t* transform_data_; // Scratch memory for transform data. 38 uint32_t* transform_mem_; // Currently allocated memory. 39 size_t transform_mem_size_; // Currently allocated memory size. 40 41 int current_width_; // Corresponds to packed image width. 42 43 // Encoding parameters derived from quality parameter. 44 int histo_bits_; 45 int transform_bits_; // <= MAX_TRANSFORM_BITS. 46 int cache_bits_; // If equal to 0, don't use color cache. 47 48 // Encoding parameters derived from image characteristics. 49 int use_cross_color_; 50 int use_subtract_green_; 51 int use_predict_; 52 int use_palette_; 53 int palette_size_; 54 uint32_t palette_[MAX_PALETTE_SIZE]; 55 56 // Some 'scratch' (potentially large) objects. 57 struct VP8LBackwardRefs refs_[2]; // Backward Refs array corresponding to 58 // LZ77 & RLE coding. 59 VP8LHashChain hash_chain_; // HashChain data for constructing 60 // backward references. 61 } VP8LEncoder; 62 63 //------------------------------------------------------------------------------ 64 // internal functions. Not public. 65 66 // Encodes the picture. 67 // Returns 0 if config or picture is NULL or picture doesn't have valid argb 68 // input. 69 int VP8LEncodeImage(const WebPConfig* const config, 70 const WebPPicture* const picture); 71 72 // Encodes the main image stream using the supplied bit writer. 73 // If 'use_cache' is false, disables the use of color cache. 74 WebPEncodingError VP8LEncodeStream(const WebPConfig* const config, 75 const WebPPicture* const picture, 76 VP8LBitWriter* const bw, int use_cache); 77 78 //------------------------------------------------------------------------------ 79 // Image transforms in predictor.c. 80 81 void VP8LResidualImage(int width, int height, int bits, int low_effort, 82 uint32_t* const argb, uint32_t* const argb_scratch, 83 uint32_t* const image, int near_lossless, int exact, 84 int used_subtract_green); 85 86 void VP8LColorSpaceTransform(int width, int height, int bits, int quality, 87 uint32_t* const argb, uint32_t* image); 88 89 //------------------------------------------------------------------------------ 90 91 #ifdef __cplusplus 92 } // extern "C" 93 #endif 94 95 #endif /* WEBP_ENC_VP8LI_H_ */ 96