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54 lines
1.6 KiB
54 lines
1.6 KiB
// 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_dec.h" |
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#include "../utils/filters_utils.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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