forked from openkylin/qpdf
105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
// Copyright (c) 2005-2020 Jay Berkenbilt
|
|
//
|
|
// This file is part of qpdf.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
// Versions of qpdf prior to version 7 were released under the terms
|
|
// of version 2.0 of the Artistic License. At your option, you may
|
|
// continue to consider qpdf to be licensed under those terms. Please
|
|
// see the manual for additional information.
|
|
|
|
#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 QPDF_DLL_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, Buffer*);
|
|
void decompress(void* cinfo, Buffer*);
|
|
|
|
enum action_e { a_compress, a_decompress };
|
|
|
|
class Members
|
|
{
|
|
friend class Pl_DCT;
|
|
|
|
public:
|
|
QPDF_DLL
|
|
~Members();
|
|
|
|
private:
|
|
Members(action_e action,
|
|
char const* buf_description,
|
|
JDIMENSION image_width = 0,
|
|
JDIMENSION image_height = 0,
|
|
int components = 1,
|
|
J_COLOR_SPACE color_space = JCS_GRAYSCALE,
|
|
CompressConfig* config_callback = 0);
|
|
Members(Members const&);
|
|
|
|
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;
|
|
};
|
|
|
|
PointerHolder<Members> m;
|
|
};
|
|
|
|
#endif // PL_DCT_HH
|