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));
}
public static extern void XRenderCompositeTrapezoids(
DisplayPtr dpy,
PictOp op,
Picture src,
Picture dst,
[In] ref XRenderPictFormat maskFormat,
int xSrc,
int ySrc,
[In] XTrapezoid[] traps,
int ntrap
);
private X11Graphics(IntPtr display, int screen, ulong rootWindow, IntPtr visual, ulong colorMap, XRenderPictFormat pictFormat, IntPtr pictFormatPtr)
{
this.display = display;
this.screen = screen;
this.rootWindow = rootWindow;
this.visual = visual;
this.colorMap = colorMap;
this.pictFormat = pictFormat;
this.pictFormatPtr = pictFormatPtr;
this.objectCache = new X11ObjectCache(display, screen);
}