internal static void Render(this BufferedGraphics source,
Graphics target,
Rectangle clientRectangle,
GdiRasterOps rasterOp
)
{
source.Render(target, clientRectangle.Location, clientRectangle.Size, rasterOp);
}
internal static void Render(this BufferedGraphics source,
Graphics target,
Point scrollPosition,
Size virtualSize,
GdiRasterOps rasterOp
)
{
if (target != null)
{
var targetDC = target.GetHdc();
try {
source.RenderInternal(new HandleRef(target, targetDC), scrollPosition, virtualSize, rasterOp);
} finally {
target.ReleaseHdc(targetDC);
}
}
}
private static void RenderInternal(this BufferedGraphics source,
HandleRef targetDC,
Point scrollPosition,
Size virtualSize,
GdiRasterOps rasterOp
)
{
var sourceDC = source.Graphics.GetHdc();
try {
NativeMethods.BitBlt(
targetDC,
scrollPosition.X, scrollPosition.Y,
virtualSize.Width, virtualSize.Height,
new HandleRef(source.Graphics, sourceDC),
0, 0,
(int)rasterOp);
} finally {
source.Graphics.ReleaseHdc(sourceDC);
}
}
