54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// Copyright 2013 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Alpha decoder: internal header.
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//
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// Author: Urvang (urvang@google.com)
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#ifndef WEBP_DEC_ALPHAI_H_
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#define WEBP_DEC_ALPHAI_H_
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#include "./webpi.h"
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#include "../utils/filters.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct VP8LDecoder; // Defined in dec/vp8li.h.
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typedef struct ALPHDecoder ALPHDecoder;
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struct ALPHDecoder {
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int width_;
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int height_;
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int method_;
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WEBP_FILTER_TYPE filter_;
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int pre_processing_;
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struct VP8LDecoder* vp8l_dec_;
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VP8Io io_;
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int use_8b_decode_; // Although alpha channel requires only 1 byte per
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// pixel, sometimes VP8LDecoder may need to allocate
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// 4 bytes per pixel internally during decode.
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uint8_t* output_;
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const uint8_t* prev_line_; // last output row (or NULL)
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};
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//------------------------------------------------------------------------------
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// internal functions. Not public.
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// Deallocate memory associated to dec->alpha_plane_ decoding
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void WebPDeallocateAlphaMemory(VP8Decoder* const dec);
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//------------------------------------------------------------------------------
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* WEBP_DEC_ALPHAI_H_ */
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