[PATCH 1/2] winex11.drv: optimise mode tests in X11DRV_ChangeDisplaySettingsEx Fields: DM_PELSWIDTH , DM_PELSHEIGHT are re-tested in the mode testing loop multiple times. However these fields have already been tested before the loop. Add pre-tests for the requested mode bpp and frequency.

[Rob Walker]

---
 dlls/winex11.drv/settings.c | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/dlls/winex11.drv/settings.c b/dlls/winex11.drv/settings.c
index afa26cf543..b0164d5806 100644
--- a/dlls/winex11.drv/settings.c
+++ b/dlls/winex11.drv/settings.c
@@ -344,7 +344,7 @@ LONG CDECL X11DRV_ChangeDisplaySettingsEx( LPCWSTR devname, LPDEVMODEW devmode,
 {
     DWORD i, dwBpp = 0;
     DEVMODEW dm;
-    BOOL def_mode = TRUE;
+    BOOL def_mode = TRUE, test_bpp, test_frequency;

TRACE("(%s,%p,%p,0x%08x,%p)\n",debugstr_w(devname),devmode,hwnd,flags,lpvoid);
     TRACE("flags=%s\n",_CDS_flags(flags));
@@ -387,29 +387,24 @@ LONG CDECL X11DRV_ChangeDisplaySettingsEx( LPCWSTR devname, LPDEVMODEW devmode,
         return DISP_CHANGE_BADMODE;
     }

+    test_bpp = devmode->dmFields & DM_BITSPERPEL;
+    test_frequency = (devmode->dmFields & DM_DISPLAYFREQUENCY) &&
+                     (devmode->dmDisplayFrequency != 0);
     for (i = 0; i < dd_mode_count; i++)
     {
-        if (devmode->dmFields & DM_BITSPERPEL)
+        if (devmode->dmPelsWidth != dd_modes[i].width) continue;
+        if (devmode->dmPelsHeight != dd_modes[i].height) continue;
+        if (test_bpp)
         {
             if (dwBpp != dd_modes[i].bpp)
                 continue;
         }
-        if (devmode->dmFields & DM_PELSWIDTH)
-        {
-            if (devmode->dmPelsWidth != dd_modes[i].width)
-                continue;
-        }
-        if (devmode->dmFields & DM_PELSHEIGHT)
-        {
-            if (devmode->dmPelsHeight != dd_modes[i].height)
-                continue;
-        }
-        if ((devmode->dmFields & DM_DISPLAYFREQUENCY) && (dd_modes[i].refresh_rate != 0) &&
-            devmode->dmDisplayFrequency != 0)
+        if (test_frequency && (dd_modes[i].refresh_rate != 0))
         {
             if (devmode->dmDisplayFrequency != dd_modes[i].refresh_rate)
                 continue;
         }
+
         /* we have a valid mode */
         TRACE("Requested display settings match mode %d (%s)\n", i, handler_name);