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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 ([email protected])
#ifndef WEBP_DEC_ALPHAI_DEC_H_
#define WEBP_DEC_ALPHAI_DEC_H_
#include "src/dec/vp8_dec.h"
#include "src/webp/types.h"
#include "src/dec/webpi_dec.h"
#include "src/dsp/dsp.h"
#include "src/utils/filters_utils.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.
uint8_t* output;
const uint8_t* prev_line; // last output row (or NULL)
};
//------------------------------------------------------------------------------
// internal functions. Not public.
// Deallocate memory associated to dec->alpha_plane decoding
void WebPDeallocateAlphaMemory(VP8Decoder* const dec);
//------------------------------------------------------------------------------
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_DEC_ALPHAI_DEC_H_
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