public static Graphics AlphaBlend(this Graphics gr, Bitmap b, Rectangle to, Rectangle from, float opacity)
{
#if WINCE
byte bopacity = unchecked((byte)(255 * opacity));
using (Graphics gxSrc = Graphics.FromImage(b))
{
IntPtr hdcDst = gr.GetHdc();
IntPtr hdcSrc = gxSrc.GetHdc();
BlendFunction blendFunction = new BlendFunction();
blendFunction.BlendOp = (byte)BlendOperation.AC_SRC_OVER;
blendFunction.BlendFlags = (byte)BlendFlags.Zero;
blendFunction.SourceConstantAlpha = bopacity;
blendFunction.AlphaFormat = (byte)0;
try{
PlatformAPI.AlphaBlend(hdcDst, to.X, to.Y, to.Width, to.Height, hdcSrc, from.X, from.Y, from.Width, from.Height, blendFunction);
}catch(Exception e){}
gr.ReleaseHdc(hdcDst);
gxSrc.ReleaseHdc(hdcSrc);
}
#else
var ia = new ImageAttributes();
float[][] ptsArray = {
new float[] {1, 0, 0, 0, 0},
new float[] {0, 1, 0, 0, 0},
new float[] {0, 0, 1, 0, 0},
new float[] {0, 0, 0, opacity, 0},
new float[] {0, 0, 0, 0, 1}};
ia.SetColorMatrix(new ColorMatrix(ptsArray));
gr.DrawImage(b, to, from.X, from.Y, from.Width, from.Height, GraphicsUnit.Pixel, ia);
#endif
return gr;
}
public static Graphics AlphaBlend(this Graphics gr, Bitmap b, Rectangle to, Rectangle from, float opacity)
{
#if WINCE
byte bopacity = unchecked ((byte)(255 * opacity));
using (Graphics gxSrc = Graphics.FromImage(b))
{
IntPtr hdcDst = gr.GetHdc();
IntPtr hdcSrc = gxSrc.GetHdc();
BlendFunction blendFunction = new BlendFunction();
blendFunction.BlendOp = (byte)BlendOperation.AC_SRC_OVER;
blendFunction.BlendFlags = (byte)BlendFlags.Zero;
blendFunction.SourceConstantAlpha = bopacity;
blendFunction.AlphaFormat = (byte)0;
try{
PlatformAPI.AlphaBlend(hdcDst, to.X, to.Y, to.Width, to.Height, hdcSrc, from.X, from.Y, from.Width, from.Height, blendFunction);
}catch (Exception e) {}
gr.ReleaseHdc(hdcDst);
gxSrc.ReleaseHdc(hdcSrc);
}
#else
var ia = new ImageAttributes();
float[][] ptsArray =
{
new float[] { 1, 0, 0, 0, 0 },
new float[] { 0, 1, 0, 0, 0 },
new float[] { 0, 0, 1, 0, 0 },
new float[] { 0, 0, 0, opacity, 0 },
new float[] { 0, 0, 0, 0, 1 }
};
ia.SetColorMatrix(new ColorMatrix(ptsArray));
gr.DrawImage(b, to, from.X, from.Y, from.Width, from.Height, GraphicsUnit.Pixel, ia);
#endif
return(gr);
}
public static extern Int32 AlphaBlend(IntPtr hdcDest, Int32 xDest, Int32 yDest, Int32 cxDest, Int32 cyDest, IntPtr hdcSrc, Int32 xSrc, Int32 ySrc, Int32 cxSrc, Int32 cySrc, BlendFunction blendFunction);
extern public static Int32 AlphaBlend(IntPtr hdcDest, Int32 xDest, Int32 yDest, Int32 cxDest, Int32 cyDest, IntPtr hdcSrc, Int32 xSrc, Int32 ySrc, Int32 cxSrc, Int32 cySrc, BlendFunction blendFunction);
