mirror of https://github.com/qpdf/qpdf.git
109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
// Copyright (c) 2005-2024 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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// in compliance with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under
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// the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic
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// License. At your option, you may continue to consider qpdf to be licensed under those terms.
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// Please see the manual for additional information.
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#ifndef PL_DCT_HH
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#define PL_DCT_HH
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#include <qpdf/Pipeline.hh>
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#include <qpdf/Pl_Buffer.hh>
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#include <cstddef>
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// jpeglib.h must be included after cstddef or else it messes up the definition of size_t.
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#include <jpeglib.h>
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class QPDF_DLL_CLASS Pl_DCT: public Pipeline
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{
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public:
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// Constructor for decompressing image data
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QPDF_DLL
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Pl_DCT(char const* identifier, Pipeline* next);
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class QPDF_DLL_CLASS CompressConfig
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{
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public:
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QPDF_DLL
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CompressConfig() = default;
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QPDF_DLL
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virtual ~CompressConfig() = default;
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virtual void apply(jpeg_compress_struct*) = 0;
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};
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// Constructor for compressing image data
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QPDF_DLL
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Pl_DCT(
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char const* identifier,
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Pipeline* next,
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JDIMENSION image_width,
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JDIMENSION image_height,
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int components,
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J_COLOR_SPACE color_space,
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CompressConfig* config_callback = nullptr);
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QPDF_DLL
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~Pl_DCT() override;
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QPDF_DLL
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void write(unsigned char const* data, size_t len) override;
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QPDF_DLL
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void finish() override;
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private:
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QPDF_DLL_PRIVATE
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void compress(void* cinfo, Buffer*);
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QPDF_DLL_PRIVATE
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void decompress(void* cinfo, Buffer*);
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enum action_e { a_compress, a_decompress };
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class QPDF_DLL_PRIVATE Members
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{
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friend class Pl_DCT;
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public:
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QPDF_DLL
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~Members() = default;
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private:
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Members(
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action_e action,
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char const* buf_description,
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JDIMENSION image_width = 0,
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JDIMENSION image_height = 0,
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int components = 1,
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J_COLOR_SPACE color_space = JCS_GRAYSCALE,
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CompressConfig* config_callback = nullptr);
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Members(Members const&) = delete;
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action_e action;
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Pl_Buffer buf;
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// Used for compression
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JDIMENSION image_width;
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JDIMENSION image_height;
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int components;
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J_COLOR_SPACE color_space;
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CompressConfig* config_callback;
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};
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std::shared_ptr<Members> m;
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};
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#endif // PL_DCT_HH
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