public void DrawImage(INativeImage image, int x, int y)
{
x += offset.X;
y += offset.Y;
// todo: allow null?
Win32Image win32Image = (Win32Image)image;
var bitmap = Gdi32API.CreateDIBSectionChecked(hdc, new BITMAPINFO(win32Image.Width, win32Image.Height), out IntPtr buffer);
IntPtr hdcMem = IntPtr.Zero;
try
{
Marshal.Copy(win32Image.Pixels, 0, buffer, win32Image.Pixels.Length);
hdcMem = Gdi32API.CreateCompatibleDCChecked(hdc);
var oldBitmap = Gdi32API.SelectObjectChecked(hdcMem, bitmap);
Gdi32API.GdiAlphaBlend
(
hdc,
x, y, win32Image.Width, win32Image.Height,
hdcMem,
0, 0, win32Image.Width, win32Image.Height,
BLENDFUNCTION.SourceAlpha()
);
Gdi32API.SelectObjectChecked(hdcMem, oldBitmap);
}
finally
{
Gdi32API.SafeDeleteObject(hdcMem);
Gdi32API.DeleteObject(bitmap);
}
}
