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.h" 18 #include "./histogram.h" 19 #include "../utils/bit_writer.h" 20 #include "../webp/encode.h" 21 #include "../webp/format_constants.h" 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 typedef struct { 28 const WebPConfig* config_; // user configuration and parameters 29 const WebPPicture* pic_; // input picture. 30 31 uint32_t* argb_; // Transformed argb image data. 32 uint32_t* argb_scratch_; // Scratch memory for argb rows 33 // (used for prediction). 34 uint32_t* transform_data_; // Scratch memory for transform data. 35 int current_width_; // Corresponds to packed image width. 36 37 // Encoding parameters derived from quality parameter. 38 int histo_bits_; 39 int transform_bits_; 40 int cache_bits_; // If equal to 0, don't use color cache. 41 42 // Encoding parameters derived from image characteristics. 43 int use_cross_color_; 44 int use_subtract_green_; 45 int use_predict_; 46 int use_palette_; 47 int palette_size_; 48 uint32_t palette_[MAX_PALETTE_SIZE]; 49 50 // Some 'scratch' (potentially large) objects. 51 struct VP8LBackwardRefs refs_[2]; // Backward Refs array corresponding to 52 // LZ77 & RLE coding. 53 VP8LHashChain hash_chain_; // HashChain data for constructing 54 // backward references. 55 } VP8LEncoder; 56 57 //------------------------------------------------------------------------------ 58 // internal functions. Not public. 59 60 // Encodes the picture. 61 // Returns 0 if config or picture is NULL or picture doesn't have valid argb 62 // input. 63 int VP8LEncodeImage(const WebPConfig* const config, 64 const WebPPicture* const picture); 65 66 // Encodes the main image stream using the supplied bit writer. 67 WebPEncodingError VP8LEncodeStream(const WebPConfig* const config, 68 const WebPPicture* const picture, 69 VP8LBitWriter* const bw); 70 71 //------------------------------------------------------------------------------ 72 73 #ifdef __cplusplus 74 } // extern "C" 75 #endif 76 77 #endif /* WEBP_ENC_VP8LI_H_ */ 78