b=383960, Upgrade cairo to 1.4.8, r=me -- moz cairo: avoid-region-extract.patch

gfx/cairo/README

@@ -32,3 +32,8 @@ win32-no-printer-bitblt.patch: If we need to BitBlt from a DC (to do
 fallback), only bother trying if the IS_DISPLAY flag is set -- many
 printers lie about their support for BitBlt, and we end up getting
 black instead of what we want.
+
+avoid-region-extract.patch: Bail from _cairo_traps_extract_region early
+if we have over 200 traps (arbitrary); this avoids an O(N*N) perf hit
+when the region is built up, because we call union_rect with each rect
+individually instead of building the region up in one go.

gfx/cairo/avoid-region-extract.patch

@@ -0,0 +1,16 @@
+diff -r 0e7cd985a7f0 gfx/cairo/cairo/src/cairo-traps.c
+--- a/gfx/cairo/cairo/src/cairo-traps.c	Fri Jun 08 18:09:53 2007 -0700
++++ b/gfx/cairo/cairo/src/cairo-traps.c	Fri Jun 08 18:10:48 2007 -0700
+@@ -599,6 +599,12 @@ _cairo_traps_extract_region (cairo_traps
+ {
+     int i;
+ 
++    /* Bail early if we have lots of traps, until we fix the code
++     * below to not use Union()
++     */
++    if (traps->num_traps > 200)
++        return CAIRO_INT_STATUS_UNSUPPORTED;
++
+     for (i = 0; i < traps->num_traps; i++)
+ 	if (!(traps->traps[i].left.p1.x == traps->traps[i].left.p2.x
+ 	      && traps->traps[i].right.p1.x == traps->traps[i].right.p2.x

gfx/cairo/cairo/src/cairo-traps.c

@@ -599,6 +599,12 @@ _cairo_traps_extract_region (cairo_traps_t     *traps,
 {
     int i;
 
+    /* Bail early if we have lots of traps, until we fix the code
+     * below to not use Union()
+     */
+    if (traps->num_traps > 200)
+        return CAIRO_INT_STATUS_UNSUPPORTED;
+
     for (i = 0; i < traps->num_traps; i++)
 	if (!(traps->traps[i].left.p1.x == traps->traps[i].left.p2.x
 	      && traps->traps[i].right.p1.x == traps->traps[i].right.p2.x