JpegReader.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
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#pragma once
 
#include <vcl/graph.hxx>
#include <vcl/bitmap.hxx>
 
#include <bitmap/BitmapWriteAccess.hxx>
#include <graphic/GraphicReader.hxx>
 
enum class GraphicFilterImportFlags;
 
enum ReadState
{
    JPEGREAD_OK,
    JPEGREAD_ERROR,
    JPEGREAD_NEED_MORE
};
 
struct JPEGCreateBitmapParam
{
    tools::ULong nWidth;
    tools::ULong nHeight;
    tools::ULong density_unit;
    tools::ULong X_density;
    tools::ULong Y_density;
 
    bool bGray;
};
 
class JPEGReader : public GraphicReader
{
    SvStream&           mrStream;
    std::optional<Bitmap> mpBitmap;
    std::optional<AlphaMask> mpIncompleteAlpha;
 
    tools::Long                mnLastPos;
    tools::Long                mnLastLines;
    bool                mbSetLogSize;
 
    Graphic CreateIntermediateGraphic(tools::Long nLines);
 
public:
            JPEGReader( SvStream& rStream, GraphicFilterImportFlags nImportFlags );
    virtual ~JPEGReader() override;
 
    ReadState Read(Graphic& rGraphic, GraphicFilterImportFlags nImportFlags, BitmapScopedWriteAccess* ppAccess);
 
    bool CreateBitmap(JPEGCreateBitmapParam const & param);
 
    Bitmap& GetBitmap() { return *mpBitmap; }
};
 
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