include/vcl/RawBitmap.hxx

   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
  10 #pragma once
  11
  12 #include <o3tl/safeint.hxx>
  13 #include <vcl/BitmapColor.hxx>
  14 #include <vcl/bitmapex.hxx>
  15
  16 namespace vcl::bitmap
  17 {
  18 /**
  19  * Intended to be used to feed into CreateFromData to create a BitmapEx. RGB data format.
  20  */
  21 class VCL_DLLPUBLIC RawBitmap
  22 {
  23     friend BitmapEx VCL_DLLPUBLIC CreateFromData(RawBitmap&& rawBitmap);
  24     std::unique_ptr<sal_uInt8[]> mpData;
  25     Size maSize;
  26     sal_uInt8 mnBitCount;
  27
  28 public:
  29     RawBitmap(Size const& rSize, sal_uInt8 nBitCount)
  30         : maSize(rSize)
  31         , mnBitCount(nBitCount)
  32     {
  33         assert(nBitCount == 24 || nBitCount == 32);
  34         if (rSize.getWidth() > std::numeric_limits<sal_Int32>::max() || rSize.getWidth() < 0)
  35             throw std::bad_alloc();
  36         if (rSize.getHeight() > std::numeric_limits<sal_Int32>::max() || rSize.getHeight() < 0)
  37             throw std::bad_alloc();
  38         sal_Int32 nRowSize, nDataSize;
  39         if (o3tl::checked_multiply<sal_Int32>(rSize.getWidth(), nBitCount / 8, nRowSize)
  40             || o3tl::checked_multiply<sal_Int32>(nRowSize, rSize.getHeight(), nDataSize)
  41             || nDataSize < 0)
  42         {
  43             throw std::bad_alloc();
  44         }
  45         mpData.reset(new sal_uInt8[nDataSize]);
  46     }
  47     void SetPixel(tools::Long nY, tools::Long nX, Color nColor)
  48     {
  49         tools::Long p = (nY * maSize.getWidth() + nX) * (mnBitCount / 8);
  50         mpData[p++] = nColor.GetRed();
  51         mpData[p++] = nColor.GetGreen();
  52         mpData[p++] = nColor.GetBlue();
  53         if (mnBitCount == 32)
  54             mpData[p] = nColor.GetAlpha();
  55     }
  56     void SetAlpha(tools::Long nY, tools::Long nX, sal_uInt8 nAlpha)
  57     {
  58         assert(mnBitCount == 32);
  59         tools::Long p = (nY * maSize.getWidth() + nX) * (mnBitCount / 8) + 3;
  60         mpData[p] = nAlpha;
  61     }
  62     Color GetPixel(tools::Long nY, tools::Long nX) const
  63     {
  64         tools::Long p = (nY * maSize.getWidth() + nX) * mnBitCount / 8;
  65         if (mnBitCount == 24)
  66             return Color(mpData[p], mpData[p + 1], mpData[p + 2]);
  67         else
  68             return Color(ColorAlpha, mpData[p + 3], mpData[p], mpData[p + 1], mpData[p + 2]);
  69     }
  70     // so we don't accidentally leave any code in that uses palette color indexes
  71     void SetPixel(tools::Long nY, tools::Long nX, BitmapColor nColor) = delete;
  72     tools::Long Height() const { return maSize.Height(); }
  73     tools::Long Width() const { return maSize.Width(); }
  74     sal_uInt8 GetBitCount() const { return mnBitCount; }
  75 };
  76
  77 } // end vcl::bitmap
  78
  79 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */