public RectangleF[] GetRegionScans(Matrix matrix)
{
if (matrix == null)
{
throw new ArgumentNullException("matrix");
}
int cnt;
Status status = GDIPlus.GdipGetRegionScansCount(nativeRegion, out cnt, matrix.NativeObject);
GDIPlus.CheckStatus(status);
if (cnt == 0)
{
return(new RectangleF[0]);
}
RectangleF[] rects = new RectangleF [cnt];
int size = Marshal.SizeOf(rects[0]);
IntPtr dest = Marshal.AllocHGlobal(size * cnt);
try {
status = GDIPlus.GdipGetRegionScans(nativeRegion, dest, out cnt, matrix.NativeObject);
GDIPlus.CheckStatus(status);
}
finally {
// note: Marshal.FreeHGlobal is called from GDIPlus.FromUnManagedMemoryToRectangles
GDIPlus.FromUnManagedMemoryToRectangles(dest, rects);
}
return(rects);
}