alphai_dec.h (1736B)
1 // Copyright 2013 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 // Alpha decoder: internal header. 11 // 12 // Author: Urvang (urvang@google.com) 13 14 #ifndef WEBP_DEC_ALPHAI_DEC_H_ 15 #define WEBP_DEC_ALPHAI_DEC_H_ 16 17 #include "src/dec/vp8_dec.h" 18 #include "src/webp/types.h" 19 #include "src/dec/webpi_dec.h" 20 #include "src/dsp/dsp.h" 21 #include "src/utils/filters_utils.h" 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 struct VP8LDecoder; // Defined in dec/vp8li.h. 28 29 typedef struct ALPHDecoder ALPHDecoder; 30 struct ALPHDecoder { 31 int width; 32 int height; 33 int method; 34 WEBP_FILTER_TYPE filter; 35 int pre_processing; 36 struct VP8LDecoder* vp8l_dec; 37 VP8Io io; 38 int use_8b_decode; // Although alpha channel requires only 1 byte per 39 // pixel, sometimes VP8LDecoder may need to allocate 40 // 4 bytes per pixel internally during decode. 41 uint8_t* output; 42 const uint8_t* prev_line; // last output row (or NULL) 43 }; 44 45 //------------------------------------------------------------------------------ 46 // internal functions. Not public. 47 48 // Deallocate memory associated to dec->alpha_plane decoding 49 void WebPDeallocateAlphaMemory(VP8Decoder* const dec); 50 51 //------------------------------------------------------------------------------ 52 53 #ifdef __cplusplus 54 } // extern "C" 55 #endif 56 57 #endif // WEBP_DEC_ALPHAI_DEC_H_