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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 (at) gmail.com)
     13 
     14 #ifndef WEBP_ENC_VP8LI_H_
     15 #define WEBP_ENC_VP8LI_H_
     16 
     17 #include "./histogram.h"
     18 #include "../utils/bit_writer.h"
     19 #include "webp/encode.h"
     20 #include "webp/format_constants.h"
     21 
     22 #if defined(__cplusplus) || defined(c_plusplus)
     23 extern "C" {
     24 #endif
     25 
     26 typedef struct {
     27   const WebPConfig* config_;    // user configuration and parameters
     28   const WebPPicture* pic_;      // input picture.
     29 
     30   uint32_t* argb_;              // Transformed argb image data.
     31   uint32_t* argb_scratch_;      // Scratch memory for argb rows
     32                                 // (used for prediction).
     33   uint32_t* transform_data_;    // Scratch memory for transform data.
     34   int       current_width_;     // Corresponds to packed image width.
     35 
     36   // Encoding parameters derived from quality parameter.
     37   int histo_bits_;
     38   int transform_bits_;
     39   int cache_bits_;        // If equal to 0, don't use color cache.
     40 
     41   // Encoding parameters derived from image characteristics.
     42   int use_cross_color_;
     43   int use_subtract_green_;
     44   int use_predict_;
     45   int use_palette_;
     46   int palette_size_;
     47   uint32_t palette_[MAX_PALETTE_SIZE];
     48 } VP8LEncoder;
     49 
     50 //------------------------------------------------------------------------------
     51 // internal functions. Not public.
     52 
     53 // Encodes the picture.
     54 // Returns 0 if config or picture is NULL or picture doesn't have valid argb
     55 // input.
     56 int VP8LEncodeImage(const WebPConfig* const config,
     57                     const WebPPicture* const picture);
     58 
     59 // Encodes the main image stream using the supplied bit writer.
     60 WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
     61                                    const WebPPicture* const picture,
     62                                    VP8LBitWriter* const bw);
     63 
     64 //------------------------------------------------------------------------------
     65 
     66 #if defined(__cplusplus) || defined(c_plusplus)
     67 }    // extern "C"
     68 #endif
     69 
     70 #endif  /* WEBP_ENC_VP8LI_H_ */
     71