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// Copyright 2017 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_
#define CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_
#include <memory>
#include <vector>
#include "core/fxcodec/gif/cfx_gif.h"
#include "core/fxcodec/gif/gif_decoder.h"
#include "core/fxcodec/gif/lzw_decompressor.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/unowned_ptr.h"
#include "third_party/base/containers/span.h"
class CFX_CodecMemory;
namespace fxcodec {
class CFX_GifContext : public ProgressiveDecoderIface::Context {
public:
explicit CFX_GifContext(GifDecoder::Delegate* delegate);
~CFX_GifContext() override;
void ReadScanline(int32_t row_num, pdfium::span<uint8_t> row_buf);
bool GetRecordPosition(uint32_t cur_pos,
int32_t left,
int32_t top,
int32_t width,
int32_t height,
int32_t pal_num,
CFX_GifPalette* pal,
int32_t trans_index,
bool interlace);
GifDecoder::Status ReadHeader();
GifDecoder::Status GetFrame();
GifDecoder::Status LoadFrame(size_t frame_num);
void SetInputBuffer(RetainPtr<CFX_CodecMemory> codec_memory);
uint32_t GetAvailInput() const;
size_t GetFrameNum() const { return images_.size(); }
UnownedPtr<GifDecoder::Delegate> const delegate_;
std::vector<CFX_GifPalette> global_palette_;
uint8_t global_palette_exp_ = 0;
uint32_t img_row_offset_ = 0;
uint32_t img_row_avail_size_ = 0;
int32_t decode_status_ = GIF_D_STATUS_SIG;
std::unique_ptr<CFX_GifGraphicControlExtension> graphic_control_extension_;
std::vector<std::unique_ptr<CFX_GifImage>> images_;
std::unique_ptr<LZWDecompressor> lzw_decompressor_;
int width_ = 0;
int height_ = 0;
uint8_t bc_index_ = 0;
uint8_t global_sort_flag_ = 0;
uint8_t global_color_resolution_ = 0;
uint8_t img_pass_num_ = 0;
protected:
bool ReadAllOrNone(uint8_t* dest, uint32_t size);
GifDecoder::Status ReadGifSignature();
GifDecoder::Status ReadLogicalScreenDescriptor();
RetainPtr<CFX_CodecMemory> input_buffer_;
private:
void SaveDecodingStatus(int32_t status);
GifDecoder::Status DecodeExtension();
GifDecoder::Status DecodeImageInfo();
void DecodingFailureAtTailCleanup(CFX_GifImage* gif_image);
bool ScanForTerminalMarker();
uint8_t GetPaletteExp(CFX_GifImage* gif_image) const;
};
} // namespace fxcodec
#endif // CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_
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