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/webpi_dec.h" |
18 | #include "src/utils/filters_utils.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 | uint8_t* output_; |
39 | const uint8_t* prev_line_; // last output row (or NULL) |
40 | }; |
41 | |
42 | //------------------------------------------------------------------------------ |
43 | // internal functions. Not public. |
44 | |
45 | // Deallocate memory associated to dec->alpha_plane_ decoding |
46 | void WebPDeallocateAlphaMemory(VP8Decoder* const dec); |
47 | |
48 | //------------------------------------------------------------------------------ |
49 | |
50 | #ifdef __cplusplus |
51 | } // extern "C" |
52 | #endif |
53 | |
54 | #endif // WEBP_DEC_ALPHAI_DEC_H_ |
55 | |