vcl/source/graphic/GraphicID.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <graphic/GraphicID.hxx>
  21
  22 #include <impgraph.hxx>
  23 #include <rtl/crc.h>
  24 #include <rtl/strbuf.hxx>
  25
  26 GraphicID::GraphicID(ImpGraphic const& rGraphic)
  27 {
  28     rGraphic.ensureAvailable();
  29
  30     mnID1 = static_cast<sal_uLong>(rGraphic.getType()) << 28;
  31     mnID2 = mnID3 = mnID4 = 0;
  32
  33     if (rGraphic.getType() == GraphicType::Bitmap)
  34     {
  35         auto const& rVectorGraphicDataPtr = rGraphic.getVectorGraphicData();
  36         if (rVectorGraphicDataPtr)
  37         {
  38             const basegfx::B2DRange& rRange = rVectorGraphicDataPtr->getRange();
  39
  40             mnID1 |= rVectorGraphicDataPtr->getBinaryDataContainer().getSize();
  41             mnID2 = basegfx::fround(rRange.getWidth());
  42             mnID3 = basegfx::fround(rRange.getHeight());
  43             mnID4 = rtl_crc32(0, rVectorGraphicDataPtr->getBinaryDataContainer().getData(),
  44                               rVectorGraphicDataPtr->getBinaryDataContainer().getSize());
  45         }
  46         else if (rGraphic.isAnimated())
  47         {
  48             const Animation aAnimation(rGraphic.getAnimation());
  49
  50             mnID1 |= (aAnimation.Count() & 0x0fffffff);
  51             mnID2 = aAnimation.GetDisplaySizePixel().Width();
  52             mnID3 = aAnimation.GetDisplaySizePixel().Height();
  53             mnID4 = rGraphic.getChecksum();
  54         }
  55         else
  56         {
  57             const BitmapEx aBmpEx(rGraphic.getBitmapEx(GraphicConversionParameters()));
  58
  59             mnID1 |= aBmpEx.IsAlpha() ? 1 : 0;
  60             mnID2 = aBmpEx.GetSizePixel().Width();
  61             mnID3 = aBmpEx.GetSizePixel().Height();
  62             mnID4 = rGraphic.getChecksum();
  63         }
  64     }
  65     else if (rGraphic.getType() == GraphicType::GdiMetafile)
  66     {
  67         const GDIMetaFile& rMtf = rGraphic.getGDIMetaFile();
  68
  69         mnID1 |= (rMtf.GetActionSize() & 0x0fffffff);
  70         mnID2 = rMtf.GetPrefSize().Width();
  71         mnID3 = rMtf.GetPrefSize().Height();
  72         mnID4 = rGraphic.getChecksum();
  73     }
  74 }
  75
  76 OString GraphicID::getIDString() const
  77 {
  78     static const char aHexData[]
  79         = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
  80
  81     sal_Int32 nShift, nIndex = 0;
  82     sal_Int32 nLen = 24 + (2 * BITMAP_CHECKSUM_SIZE);
  83     OStringBuffer aHexStr(nLen);
  84     aHexStr.setLength(nLen);
  85
  86     for (nShift = 28; nShift >= 0; nShift -= 4)
  87         aHexStr[nIndex++] = aHexData[(mnID1 >> static_cast<sal_uInt32>(nShift)) & 0xf];
  88
  89     for (nShift = 28; nShift >= 0; nShift -= 4)
  90         aHexStr[nIndex++] = aHexData[(mnID2 >> static_cast<sal_uInt32>(nShift)) & 0xf];
  91
  92     for (nShift = 28; nShift >= 0; nShift -= 4)
  93         aHexStr[nIndex++] = aHexData[(mnID3 >> static_cast<sal_uInt32>(nShift)) & 0xf];
  94
  95     for (nShift = (8 * BITMAP_CHECKSUM_SIZE) - 4; nShift >= 0; nShift -= 4)
  96         aHexStr[nIndex++] = aHexData[(mnID4 >> static_cast<sal_uInt32>(nShift)) & 0xf];
  97
  98     return aHexStr.makeStringAndClear();
  99 }
 100
 101 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */