Fehler beim drehen eines Bitmaps

Hallo zusammen,

folgender Code:

if (Image1->Picture->Graphic)
  {
   Graphics::TBitmap *tgtbmp = new Graphics::TBitmap();
   Graphics::TBitmap *srcbmp = new Graphics::TBitmap();

   srcbmp->Assign(Image1->Picture->Graphic);
   tgtbmp->Height = srcbmp->Width;
   tgtbmp->Width = srcbmp->Height;
   tgtbmp->PixelFormat = pf32bit;
   srcbmp->PixelFormat = tgtbmp->PixelFormat;

   int *tgtptr, *srcptr;
   for( int y = 0; y < tgtbmp->Height; y++)
   {
     tgtptr = (int*)tgtbmp->ScanLine[tgtbmp->Height-y];
     for(int x = 0; x < tgtbmp->Width; x++)
     {
       srcptr = (int*)srcbmp->ScanLine[x];
       tgtptr[x] = srcptr[y];
     }
   }
   Image1->Picture->Bitmap = tgtbmp;
   delete tgtbmp;
   delete srcbmp;
   if (!jpRotate)
   {
    jpRotate = new TJPEGImage();
   }
   jpRotate->Assign(Image1->Picture->Graphic);
   rotate = true;
  }

manchmal klapt die Routine, ab und zu bekomme ich eine Zugriffsverletzung, vielleicht weis ja jemand wo der Fehler steckt. Danke

DerAltenburger

tgtptr = (int*)tgtbmp->ScanLine[tgtbmp->Height-y-1];
     for(int x = 0; x < tgtbmp->Width; x++)
     {
       srcptr = (int*)srcbmp->ScanLine[x];
       tgtptr[x] = srcptr[y];
     }