PngImageReader.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 */
 
#ifndef INCLUDED_VCL_FILTER_PNGIMAGEREADER_HXX
#define INCLUDED_VCL_FILTER_PNGIMAGEREADER_HXX
 
#include <sal/config.h>
 
#include <memory>
#include <vector>
 
#include <vcl/dllapi.h>
#include <vcl/BinaryDataContainer.hxx>
 
#include <com/sun/star/uno/Reference.hxx>
 
constexpr sal_uInt64 PNG_SIGNATURE = 0x89504E470D0A1A0A;
constexpr sal_uInt32 PNG_IHDR_SIGNATURE = 0x49484452;
constexpr sal_uInt32 PNG_IDAT_SIGNATURE = 0x49444154;
constexpr sal_uInt32 PNG_PHYS_SIGNATURE = 0x70485973;
constexpr sal_uInt32 PNG_TRNS_SIGNATURE = 0x74524E53;
constexpr sal_uInt32 PNG_ACTL_SIGNATURE = 0x6163544C;
constexpr sal_uInt32 PNG_FCTL_SIGNATURE = 0x6663544C;
constexpr sal_uInt32 PNG_FDAT_SIGNATURE = 0x66644154;
constexpr sal_uInt32 PNG_IEND_SIGNATURE = 0x49454E44;
constexpr sal_uInt32 PNG_IEND_CRC = 0xAE426082;
constexpr int PNG_SIGNATURE_SIZE = 8;
constexpr int PNG_IHDR_SIZE = 13;
constexpr int PNG_TYPE_SIZE = 4;
constexpr int PNG_SIZE_SIZE = 4;
constexpr int PNG_CRC_SIZE = 4;
constexpr int PNG_IEND_SIZE = 0;
 
namespace com::sun::star::task
{
class XStatusIndicator;
}
 
class Graphic;
class BitmapEx;
class SvStream;
 
namespace vcl
{
class VCL_DLLPUBLIC PngImageReader
{
    SvStream& mrStream;
    css::uno::Reference<css::task::XStatusIndicator> mxStatusIndicator;
 
public:
    PngImageReader(SvStream& rStream);
 
    // Returns true if image was successfully read without errors.
    // A usable bitmap may be returned even if there were errors (e.g. incomplete image).
    bool read(BitmapEx& rBitmap);
    bool read(Graphic& rGraphic);
    // Returns a bitmap without indicating if there were errors.
    BitmapEx read();
 
    // Returns the contents of the msOG chunk (containing a Gif image), if it exists.
    // Does not change position in the stream.
    static BinaryDataContainer getMicrosoftGifChunk(SvStream& rStream);
 
    static bool isAPng(SvStream& rStream);
};
 
} // namespace vcl
 
#endif
 
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