// Set this window's icon.
void IToolkitTopLevelWindow.SetIcon(Icon icon)
{
DotGNU.Images.Frame frame = ToolkitManager.GetImageFrame(icon);
Xsharp.Image origIcon = Icon;
if (frame != null)
{
Icon = new Xsharp.Image(Screen, frame);
}
else
{
Icon = null;
}
if (origIcon != null)
{
origIcon.Dispose();
}
}
// Create an HICON handle from an icon.
// "DeleteObject" must be called on it when no longer needed.
IntPtr HandleFromIcon(Icon icon)
{
Frame frame = ToolkitManager.GetImageFrame(icon);
Win32.Api.ICONINFO iconInfo = new System.Drawing.Win32.Api.ICONINFO();
iconInfo.fIcon = true;
// Hotspot is always the middle for an icon.
iconInfo.xHotspot = iconInfo.yHotspot = 0;
// Create the mono bitmap mask using CreateBitmap rather than CreateDIBitmap, its faster.
// CreateBitmap expects the mask data to be word aligned, not int aligned and the mask is inverted.
int frameBytes = (frame.Width + 7) / 8;
int newStride = (frameBytes + 1) & ~1;
byte[] inverseMask = new byte[frame.Height * newStride];
int prevOldPos = 0;
int prevNewPos = 0;
for (int y = 0; y < frame.Height; y++)
{
int oldPos = prevOldPos;
int newPos = prevNewPos;
for (int b = 0; b < frameBytes; b++)
{
inverseMask[newPos++] = (byte)~frame.Mask[oldPos++];
}
prevOldPos += frame.MaskStride;
prevNewPos += newStride;
}
iconInfo.hbmMask = Win32.Api.CreateBitmap(frame.Width, frame.Height, 1, 1, inverseMask);
iconInfo.hbmColor = HandleFromBitmap(frame, true);
IntPtr iconHandle = Win32.Api.CreateIconIndirect(ref iconInfo);
Win32.Api.DeleteObject(iconInfo.hbmMask);
Win32.Api.DeleteObject(iconInfo.hbmColor);
return(iconHandle);
}
