fix pixel address calculation in RawBitmap

Change-Id: I42476a8049330ff02c555ecba49b49f3cf012086
Reviewed-on: https://gerrit.libreoffice.org/49599Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/vcl/BitmapTools.hxx

@@ -19,7 +19,7 @@ namespace vcl {
 namespace bitmap {
 
 /**
- * intended to be used to feed into CreateFromData to create a BitmapEx
+ * Intended to be used to feed into CreateFromData to create a BitmapEx. RGB data format.
  */
 class VCL_DLLPUBLIC RawBitmap
 {
@@ -34,7 +34,7 @@ public:
     }
     void SetPixel(long nY, long nX, BitmapColor nColor)
     {
-        long p = nY * maSize.getWidth() + nX;
+        long p = (nY * maSize.getWidth() + nX) * 3;
         mpData[ p++ ] = nColor.GetRed();
         mpData[ p++ ] = nColor.GetGreen();
         mpData[ p   ] = nColor.GetBlue();

vcl/source/bitmap/BitmapTools.cxx

@@ -151,7 +151,7 @@ BitmapEx CreateFromData( RawBitmap&& rawBitmap )
     auto nWidth = rawBitmap.maSize.getWidth();
     for( long y = 0; y < nHeight; ++y )
     {
-        sal_uInt8 const *p = rawBitmap.mpData.get() + y * nWidth;
+        sal_uInt8 const *p = rawBitmap.mpData.get() + (y * nWidth * 3);
         Scanline pScanline = pWrite->GetScanline(y);
         for (long x = 0; x < nWidth; ++x)
         {