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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_H_
15 #define WEBP_DEC_ALPHAI_H_
16 
17 #include "./webpi.h"
18 #include "../utils/filters.h"
19 
20 #ifdef __cplusplus
21 extern "C" {
22 #endif
23 
24 struct VP8LDecoder;  // Defined in dec/vp8li.h.
25 
26 typedef struct ALPHDecoder ALPHDecoder;
27 struct ALPHDecoder {
28   int width_;
29   int height_;
30   int method_;
31   WEBP_FILTER_TYPE filter_;
32   int pre_processing_;
33   struct VP8LDecoder* vp8l_dec_;
34   VP8Io io_;
35   int use_8b_decode;  // Although alpha channel requires only 1 byte per
36                       // pixel, sometimes VP8LDecoder may need to allocate
37                       // 4 bytes per pixel internally during decode.
38 };
39 
40 //------------------------------------------------------------------------------
41 // internal functions. Not public.
42 
43 // Allocates a new alpha decoder instance.
44 ALPHDecoder* ALPHNew(void);
45 
46 // Clears and deallocates an alpha decoder instance.
47 void ALPHDelete(ALPHDecoder* const dec);
48 
49 //------------------------------------------------------------------------------
50 
51 #ifdef __cplusplus
52 }    // extern "C"
53 #endif
54 
55 #endif  /* WEBP_DEC_ALPHAI_H_ */
56