Pl_DCT.hh
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// Copyright (c) 2005-2015 Jay Berkenbilt
//
// This file is part of qpdf. This software may be distributed under
// the terms of version 2 of the Artistic License which may be found
// in the source distribution. It is provided "as is" without express
// or implied warranty.
#ifndef __PL_DCT_HH__
#define __PL_DCT_HH__
#include <qpdf/Pipeline.hh>
#include <qpdf/Pl_Buffer.hh>
#include <jpeglib.h>
class Pl_DCT: public Pipeline
{
public:
// Constructor for decompressing image data
QPDF_DLL
Pl_DCT(char const* identifier, Pipeline* next);
class CompressConfig
{
public:
CompressConfig()
{
}
virtual ~CompressConfig()
{
}
virtual void apply(jpeg_compress_struct*) = 0;
};
// Constructor for compressing image data
QPDF_DLL
Pl_DCT(char const* identifier, Pipeline* next,
JDIMENSION image_width,
JDIMENSION image_height,
int components,
J_COLOR_SPACE color_space,
CompressConfig* config_callback = 0);
QPDF_DLL
virtual ~Pl_DCT();
QPDF_DLL
virtual void write(unsigned char* data, size_t len);
QPDF_DLL
virtual void finish();
private:
void compress(void* cinfo, PointerHolder<Buffer>);
void decompress(void* cinfo, PointerHolder<Buffer>);
enum action_e { a_compress, a_decompress };
action_e action;
Pl_Buffer buf;
// Used for compression
JDIMENSION image_width;
JDIMENSION image_height;
int components;
J_COLOR_SPACE color_space;
CompressConfig* config_callback;
};
#endif // __PL_DCT_HH__