public static X11Graphics Create(IntPtr display)
{
int defaultScreen = LibX11.XDefaultScreen(display);
ulong defaultRootWindow = LibX11.XDefaultRootWindow(display);
//todo: is is safe to keep pictFormatPtr after reading it into XRenderPictFormat
IntPtr pictFormatPtr = LibXRender.XRenderFindStandardFormat(display, StandardPictFormat.PictStandardARGB32);
if (pictFormatPtr == IntPtr.Zero)
{
throw new InvalidOperationException("Display does not support 32-bit ARGB.");
}
XRenderPictFormat pictFormat = Marshal.PtrToStructure <XRenderPictFormat>(pictFormatPtr);
int status = LibX11.XMatchVisualInfo
(
display,
defaultScreen,
pictFormat.depth,
VisualClass.TrueColor,
out XVisualInfo visualInfo
);
if (status == 0)
{
throw new InvalidOperationException($"TrueColor visual with depth {pictFormat.depth} does not exist.");
}
ulong colorMap = LibX11.XCreateColormap(display, defaultRootWindow, visualInfo.visual, CreateColormapOption.AllocNone);
return(new X11Graphics(display, defaultScreen, defaultRootWindow, visualInfo.visual, colorMap, pictFormat, pictFormatPtr));
}