AuroraMiddleware/qt5base-lts
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Small xcb startup performance optimization.

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Prefetch all the extensions, to avoid having to do blocking calls later.

Change-Id: I1527dbf03d76372ec88bc0d5d9f7af18a4cc2a26
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
This commit is contained in:
Samuel Rødal 2012-10-02 09:30:18 +02:00 committed by The Qt Project
parent cdc2161b6f
commit 9b2e4cd5a8
1 changed files with 15 additions and 1 deletions
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16
src/plugins/platforms/xcb/qxcbconnection.cpp
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@ -60,6 +60,8 @@
#include <stdio.h>
#include <errno.h>
#include <xcb/shm.h>
#include <xcb/sync.h>
#include <xcb/xfixes.h>
#ifdef XCB_USE_XLIB
@ -308,7 +310,19 @@ QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, const char
connect(dispatcher, SIGNAL(awake()), this, SLOT(processXcbEvents()));
#endif
xcb_prefetch_extension_data (m_connection, &xcb_xfixes_id);
xcb_extension_t *extensions[] = {
&xcb_shm_id, &xcb_xfixes_id, &xcb_randr_id, &xcb_shape_id, &xcb_sync_id,
#ifdef XCB_USE_RENDER
&xcb_render_id,
#endif
#ifdef XCB_HAS_XCB_GLX
&xcb_glx_id,
#endif
0
};
for (xcb_extension_t **ext_it = extensions; *ext_it; ++ext_it)
xcb_prefetch_extension_data (m_connection, *ext_it);
m_setup = xcb_get_setup(xcb_connection());