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// Copyright (c) 2005-2024 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 <cstddef>
// jpeglib.h must be included after cstddef or else it messes up the definition of size_t.
#include <jpeglib.h>
class QPDF_DLL_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:
QPDF_DLL
CompressConfig() = default;
QPDF_DLL
virtual ~CompressConfig() = default;
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 = nullptr);
QPDF_DLL
~Pl_DCT() override;
QPDF_DLL
void write(unsigned char const* data, size_t len) override;
QPDF_DLL
void finish() override;
private:
QPDF_DLL_PRIVATE
void compress(void* cinfo, Buffer*);
QPDF_DLL_PRIVATE
void decompress(void* cinfo, Buffer*);
enum action_e { a_compress, a_decompress };
class QPDF_DLL_PRIVATE Members
{
friend class Pl_DCT;
public:
QPDF_DLL
~Members() = default;
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 = nullptr);
Members(Members const&) = delete;
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;
};
std::shared_ptr<Members> m;
};
#endif // PL_DCT_HH
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