public static void DrawAlpha(this Graphics g, Image image, byte transparency, int x, int y)
{
using (var gSrc = Graphics.FromImage(image))
{
var hdcDst = g.GetHdc();
var hdcSrc = gSrc.GetHdc();
var blendFunction = new BlendFunction
{
BlendOp = 0x00, // AC_SRC_OVER
BlendFlags = 0x00,
SourceConstantAlpha = transparency,
AlphaFormat = 0
};
NativeMethods.AlphaBlend(hdcDst, x, y, image.Width, image.Height, hdcSrc, 0, 0, image.Width, image.Height, blendFunction);
g.ReleaseHdc(hdcDst);
gSrc.ReleaseHdc(hdcSrc);
}
}
internal static extern bool AlphaBlend(IntPtr hdcDest, int xDest, int yDest, int cxDest, int cyDest, IntPtr hdcSrc, int xSrc, int ySrc, int cxSrc, int cySrc, BlendFunction blendFunction);
public static void DrawAlpha(this Graphics g, Image image, byte transparency, int x, int y)
{
using (var gSrc = Graphics.FromImage(image))
{
var hdcDst = g.GetHdc();
var hdcSrc = gSrc.GetHdc();
var blendFunction = new BlendFunction
{
BlendOp = 0x00, // AC_SRC_OVER
BlendFlags = 0x00,
SourceConstantAlpha = transparency,
AlphaFormat = 0
};
NativeMethods.AlphaBlend(hdcDst, x, y, image.Width, image.Height, hdcSrc, 0, 0, image.Width, image.Height, blendFunction);
g.ReleaseHdc(hdcDst);
gSrc.ReleaseHdc(hdcSrc);
}
}
internal static extern bool AlphaBlend(IntPtr hdcDest, int xDest, int yDest, int cxDest, int cyDest, IntPtr hdcSrc, int xSrc, int ySrc, int cxSrc, int cySrc, BlendFunction blendFunction);