我正在尝试创建一个复合窗口管理器。目前它可以工作,但是当一个窗口覆盖另一个窗口时,会出现闪烁的问题。我发现这是因为我创建了一个
我的期望行为是有一个离屏的
到目前为止(这段代码在一个无限循环中运行):
Picture
,然后在其上绘制,导致它绘制到屏幕上。我的期望行为是有一个离屏的
Picture
,我可以在其上绘图,然后使用XComposite将其绘制到屏幕上的窗口上。有没有办法创建一个与根窗口大小相同的离屏Picture
?到目前为止(这段代码在一个无限循环中运行):
Window root, parent, *children;
uint children_count;
XQueryTree(disp, DefaultRootWindow(disp), &root, &parent, &children, &children_count);
// I'd like the following picture to be offscreen.
// I suspect that I have to put else something where rootPicture is
// Currently, when I draw to this picture, X11 renders it to the screen immediately, which is what I don't want.
Picture pictureBuf = XRenderCreatePicture(disp, /* rootPicture */, XRenderFindVisualFormat(disp, DefaultVisual(disp, DefaultScreen(disp))), CPSubwindowMode, &RootAttributes);
for (uint i = 0; i < children_count; i++) {
// collapsed some stuff that doesn't matter
Picture picture = XRenderCreatePicture(disp, children[i], pictureFormat, CPSubwindowMode, &pictureAttributes);
// The following line should composite to an offscreen picture
XRenderComposite(disp, hasAlpha ? PictOpOver : PictOpSrc, picture, None, pictureBuf, 0, 0, 0, 0, windowRect.x(), windowRect.y(), windowRect.width(), windowRect.height());
// collapsed some stuff that doesn't matter
}
// The following line should composite from the offscreen picture to an onscreen picture
XRenderComposite(disp, PictOpSrc, pictureBuf, None, rootPicture, 0, 0, 0, 0, RootAttr.x, RootAttr.y, RootAttr.width, RootAttr.height);
Picture
是一个XID
的别名,而XID
本身是一个unsigned long
的别名。 - Victor Tran