void X11XRenderBackend::init(bool createOverlay)
{
if (m_front != XCB_RENDER_PICTURE_NONE)
xcb_render_free_picture(connection(), m_front);
bool haveOverlay = createOverlay ? m_overlayWindow->create() : (m_overlayWindow->window() != XCB_WINDOW_NONE);
if (haveOverlay) {
m_overlayWindow->setup(XCB_WINDOW_NONE);
ScopedCPointer<xcb_get_window_attributes_reply_t> attribs(xcb_get_window_attributes_reply(connection(),
xcb_get_window_attributes_unchecked(connection(), m_overlayWindow->window()), NULL));
if (!attribs) {
setFailed("Failed getting window attributes for overlay window");
return;
}
m_format = XRenderUtils::findPictFormat(attribs->visual);
if (m_format == 0) {
setFailed("Failed to find XRender format for overlay window");
return;
}
m_front = xcb_generate_id(connection());
xcb_render_create_picture(connection(), m_front, m_overlayWindow->window(), m_format, 0, NULL);
} else {
// create XRender picture for the root window
m_format = XRenderUtils::findPictFormat(defaultScreen()->root_visual);
if (m_format == 0) {
setFailed("Failed to find XRender format for root window");
return; // error
}
m_front = xcb_generate_id(connection());
const uint32_t values[] = {XCB_SUBWINDOW_MODE_INCLUDE_INFERIORS};
xcb_render_create_picture(connection(), m_front, rootWindow(), m_format, XCB_RENDER_CP_SUBWINDOW_MODE, values);
}
createBuffer();
}
xcb_window_t rootWindow(xcb_connection_t *c, int screen)
{
xcb_screen_t *s = defaultScreen(c, screen);
if (!s) {
return XCB_WINDOW_NONE;
}
return s->root;
}
