jpeg_decompressor.h

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/*
**  ClanLib SDK
**  Copyright (c) 1997-2009 The ClanLib Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries ClanLib may link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/


#pragma once

#include "../api_display.h"
#include "../Image/pixel_buffer.h"
#include "../../Core/Text/string_types.h"
#include <vector>

class CL_IODevice;
class CL_JPEGDecompressor_Impl;

class CL_API_DISPLAY CL_JPEGDecompressor
{

public:

        CL_JPEGDecompressor(CL_IODevice input_source);


public:
        enum SpecialMarker
        {
                marker_rst0 = 0xD0,
                marker_eoi  = 0xD9,
                marker_app0 = 0xe0,
                marker_app1 = 0xe1, // EXIF data
                marker_app2 = 0xe2, // FlashPix Ready data (is that a fancy word for thumbnail?)
                marker_app3 = 0xe3,
                marker_app4 = 0xe4,
                marker_app5 = 0xe5,
                marker_app6 = 0xe6,
                marker_app7 = 0xe7,
                marker_app8 = 0xe8,
                marker_app9 = 0xe9,
                marker_app10 = 0xea,
                marker_app11 = 0xeb,
                marker_app12 = 0xec,
                marker_app13 = 0xed,
                marker_app14 = 0xee,
                marker_com  = 0xfe
        };

        struct SavedMarker
        {
                unsigned char marker;
                unsigned int original_length;
                unsigned int data_length;
                void *data;
        };

        int get_output_width() const;

        int get_output_height() const;

        int get_output_components() const;

        std::vector<SavedMarker> get_saved_markers() const;


public:

        void record_marker(SpecialMarker marker_code, unsigned int length_limit = 0xffff);

        void start(bool raw_data = false);

        unsigned int read_scanlines(unsigned char **data, unsigned int lines);

        unsigned int read_raw_data(const unsigned char ***data, unsigned int lines);

        void finish();


private:
        CL_SharedPtr<CL_JPEGDecompressor_Impl> impl;
};

---