Add RegionEqual function for older XFree86 versions.

Fixes bug : http://bugzilla.eng.vmware.com/show_bug.cgi?id=312853

When we added AUTOPAINT_COLORKEY capability to our VMware video driver,
region functions were used to keep track of colorkey painting.

REGION_EQUAL was one of them.

Unfortunately REGION_EQUAL was not present in regionstr.h shipped with XFree86 version
4.3.0.
This version is used by TurboLinux 10; causing X server to crash while playing videos.

REGION_EQUAL was added in revision 1.8 of regionstr.h and available for xfree86 version
4.3.99
onwards.
Reference:
http://cvsweb.xfree86.org/cvsweb/xc/programs/Xserver/include/regionstr.h.diff?r1=1.7&r2=1.8

When I compiled the existing code(without my change), I see a warning was generated
indicating REGION_EQUAL is not present.
Too bad we missed it.

This patch includes
1) Slightly modified version of miRegionEqual from miRegion.c
2) Some formating cleanup.

1 files changed, 53 insertions, 0 deletions

diff --git a/src/vmware.c b/src/vmware.c
index c2b72e8..cff4715 100644
--- a/src/vmware.c
+++ b/src/vmware.c
@@ -1447,6 +1447,59 @@ VMWAREAddDisplayMode(ScrnInfoPtr pScrn,
 }
 
 
+/*
+ *-----------------------------------------------------------------------------
+ *
+ * vmwareIsRegionEqual --
+ *
+ *    This function implements REGION_EQUAL because older versions of
+ *    regionstr.h don't define it.
+ *    It is a slightly modified version of miRegionEqual from $Xorg: miregion.c
+ *
+ * Results:
+ *    TRUE if regions are equal; FALSE otherwise
+ *
+ * Side effects:
+ *    None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+
+Bool
+vmwareIsRegionEqual(const RegionPtr reg1,
+                    const RegionPtr reg2)
+{
+    int i, num;
+    BoxPtr rects1, rects2;
+
+    if ((reg1->extents.x1 != reg2->extents.x1) ||
+        (reg1->extents.x2 != reg2->extents.x2) ||
+        (reg1->extents.y1 != reg2->extents.y1) ||
+        (reg1->extents.y2 != reg2->extents.y2)) {
+        return FALSE;
+    }
+
+    num = REGION_NUM_RECTS(reg1);
+    if (num != REGION_NUM_RECTS(reg2)) {
+        return FALSE;
+    }
+
+    rects1 = REGION_RECTS(reg1);
+    rects2 = REGION_RECTS(reg2);
+
+    for (i = 0; i < num; i++) {
+        if ((rects1[i].x1 != rects2[i].x1) ||
+            (rects1[i].x2 != rects2[i].x2) ||
+            (rects1[i].y1 != rects2[i].y1) ||
+            (rects1[i].y2 != rects2[i].y2)) {
+            return FALSE;
+        }
+    }
+
+    return TRUE;
+}
+
+
 #if VMWARE_DRIVER_FUNC
 static Bool
 VMWareDriverFunc(ScrnInfoPtr pScrn,