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| 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 uint32_t* transform_mem_; // Currently allocated memory. | |
| 36 size_t transform_mem_size_; // Currently allocated memory size. | |
| 37 | |
| 38 int current_width_; // Corresponds to packed image width. | |
| 39 | |
| 40 // Encoding parameters derived from quality parameter. | |
| 41 int histo_bits_; | |
| 42 int transform_bits_; | |
| 43 int cache_bits_; // If equal to 0, don't use color cache. | |
| 44 | |
| 45 // Encoding parameters derived from image characteristics. | |
| 46 int use_cross_color_; | |
| 47 int use_subtract_green_; | |
| 48 int use_predict_; | |
| 49 int use_palette_; | |
| 50 int palette_size_; | |
| 51 uint32_t palette_[MAX_PALETTE_SIZE]; | |
| 52 | |
| 53 // Some 'scratch' (potentially large) objects. | |
| 54 struct VP8LBackwardRefs refs_[2]; // Backward Refs array corresponding to | |
| 55 // LZ77 & RLE coding. | |
| 56 VP8LHashChain hash_chain_; // HashChain data for constructing | |
| 57 // backward references. | |
| 58 } VP8LEncoder; | |
| 59 | |
| 60 //------------------------------------------------------------------------------ | |
| 61 // internal functions. Not public. | |
| 62 | |
| 63 // Encodes the picture. | |
| 64 // Returns 0 if config or picture is NULL or picture doesn't have valid argb | |
| 65 // input. | |
| 66 int VP8LEncodeImage(const WebPConfig* const config, | |
| 67 const WebPPicture* const picture); | |
| 68 | |
| 69 // Encodes the main image stream using the supplied bit writer. | |
| 70 // If 'use_cache' is false, disables the use of color cache. | |
| 71 WebPEncodingError VP8LEncodeStream(const WebPConfig* const config, | |
| 72 const WebPPicture* const picture, | |
| 73 VP8LBitWriter* const bw, int use_cache); | |
| 74 | |
| 75 //------------------------------------------------------------------------------ | |
| 76 | |
| 77 #ifdef __cplusplus | |
| 78 } // extern "C" | |
| 79 #endif | |
| 80 | |
| 81 #endif /* WEBP_ENC_VP8LI_H_ */ | |
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Chromium Code Reviews
Issue 2651883004:
libwebp-0.6.0-rc1 (Closed)
