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- // Copyright 2013 Google Inc. All Rights Reserved.
- //
- // Use of this source code is governed by a BSD-style license
- // that can be found in the COPYING file in the root of the source
- // tree. An additional intellectual property rights grant can be found
- // in the file PATENTS. All contributing project authors may
- // be found in the AUTHORS file in the root of the source tree.
- // -----------------------------------------------------------------------------
- //
- // Alpha decoder: internal header.
- //
- // Author: Urvang (urvang@google.com)
- #ifndef WEBP_DEC_ALPHAI_H_
- #define WEBP_DEC_ALPHAI_H_
- #include "./webpi.h"
- #include "../utils/filters.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- struct VP8LDecoder; // Defined in dec/vp8li.h.
- typedef struct ALPHDecoder ALPHDecoder;
- struct ALPHDecoder {
- int width_;
- int height_;
- int method_;
- WEBP_FILTER_TYPE filter_;
- int pre_processing_;
- struct VP8LDecoder* vp8l_dec_;
- VP8Io io_;
- int use_8b_decode; // Although alpha channel requires only 1 byte per
- // pixel, sometimes VP8LDecoder may need to allocate
- // 4 bytes per pixel internally during decode.
- };
- //------------------------------------------------------------------------------
- // internal functions. Not public.
- // Allocates a new alpha decoder instance.
- ALPHDecoder* ALPHNew(void);
- // Clears and deallocates an alpha decoder instance.
- void ALPHDelete(ALPHDecoder* const dec);
- //------------------------------------------------------------------------------
- #ifdef __cplusplus
- } // extern "C"
- #endif
- #endif /* WEBP_DEC_ALPHAI_H_ */
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