Bug 322345. Cap maximum ft2 font size at 1000 pixels to avoid killing freetype2 and/or the X server. r=vlad

gfx/cairo/cairo/src/cairo-ft-font.c

@@ -62,6 +62,10 @@
  */
 #define MAX_OPEN_FACES 10
 
+/* This is the maximum font size we allow to be passed to FT_Set_Char_Size
+ */
+#define MAX_FONT_SIZE 1000
+
 /*
  * The simple 2x2 matrix is converted into separate scale and shape
  * factors so that hinting works right
@@ -643,9 +647,18 @@ _cairo_ft_unscaled_font_set_scale (cairo_ft_unscaled_font_t *unscaled,
     FT_Set_Transform(unscaled->face, &mat, NULL);
 
     if ((unscaled->face->face_flags & FT_FACE_FLAG_SCALABLE) != 0) {
+        double x_scale = sf.x_scale;
+        double y_scale = sf.y_scale;
+        if (x_scale > MAX_FONT_SIZE) {
+            x_scale = MAX_FONT_SIZE;
+        }
+        if (y_scale > MAX_FONT_SIZE) {
+            y_scale = MAX_FONT_SIZE;
+        }
+
 	error = FT_Set_Char_Size (unscaled->face,
-				  sf.x_scale * 64.0,
-				  sf.y_scale * 64.0,
+				  x_scale * 64.0,
+				  y_scale * 64.0,
 				  0, 0);
 	assert (error == 0);
     } else {

gfx/cairo/max-font-size.patch

@@ -0,0 +1,36 @@
+diff --git a/src/cairo-ft-font.c b/src/cairo-ft-font.c
+index 59a5acb..8851387 100644
+--- a/src/cairo-ft-font.c
++++ b/src/cairo-ft-font.c
+@@ -62,6 +62,10 @@
+  */
+ #define MAX_OPEN_FACES 10
+ 
++/* This is the maximum font size we allow to be passed to FT_Set_Char_Size
++ */
++#define MAX_FONT_SIZE 1000
++
+ /*
+  * The simple 2x2 matrix is converted into separate scale and shape
+  * factors so that hinting works right
+@@ -643,9 +647,18 @@ _cairo_ft_unscaled_font_set_scale (cairo
+     FT_Set_Transform(unscaled->face, &mat, NULL);
+ 
+     if ((unscaled->face->face_flags & FT_FACE_FLAG_SCALABLE) != 0) {
++        double x_scale = sf.x_scale;
++        double y_scale = sf.y_scale;
++        if (x_scale > MAX_FONT_SIZE) {
++            x_scale = MAX_FONT_SIZE;
++        }
++        if (y_scale > MAX_FONT_SIZE) {
++            y_scale = MAX_FONT_SIZE;
++        }
++
+ 	error = FT_Set_Char_Size (unscaled->face,
+-				  sf.x_scale * 64.0,
+-				  sf.y_scale * 64.0,
++				  x_scale * 64.0,
++				  y_scale * 64.0,
+ 				  0, 0);
+ 	assert (error == 0);
+     } else {