From 8894894d9d34d169efa39d6d86ebefcb2ba69fe1 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 24 Aug 2007 13:40:26 +0100
Subject: [PATCH] [cairo-boilerplate-xlib] Check that the surface will fit in
 the screen.

Whilst testing the fallback surface, the resultant image was being
clipped to the screen size. Be conservative and refuse to create
windows (for CAIRO_CONTENT_COLOR surfaces) that are larger than the
 screen.
---
 boilerplate/cairo-boilerplate-xlib.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/boilerplate/cairo-boilerplate-xlib.c b/boilerplate/cairo-boilerplate-xlib.c
index c0553ef06..781f8f9e2 100644
--- a/boilerplate/cairo-boilerplate-xlib.c
+++ b/boilerplate/cairo-boilerplate-xlib.c
@@ -110,6 +110,18 @@ _cairo_boilerplate_xlib_test_create_surface (Display			*dpy,
 							  width, height);
 }
 
+
+static cairo_bool_t
+_cairo_boilerplate_xlib_check_screen_size (Display	*dpy,
+	                                   int		 screen,
+					   int		 width,
+					   int		 height)
+{
+    Screen *scr = XScreenOfDisplay (dpy, screen);
+    return width <= WidthOfScreen (scr) && height <= HeightOfScreen (scr);
+}
+
+
 static cairo_surface_t *
 _cairo_boilerplate_xlib_perf_create_surface (Display			*dpy,
 					     cairo_content_t		 content,
@@ -135,6 +147,13 @@ _cairo_boilerplate_xlib_perf_create_surface (Display			*dpy,
 	break;
 
     case CAIRO_CONTENT_COLOR:
+	if (! _cairo_boilerplate_xlib_check_screen_size (dpy,
+		                                         DefaultScreen (dpy),
+		                                         width, height)) {
+	    CAIRO_BOILERPLATE_LOG ("Surface is larger than the Screen.\n");
+	    return NULL;
+	}
+
 	visual = DefaultVisual (dpy, DefaultScreen (dpy));
 	xrender_format = XRenderFindVisualFormat (dpy, visual);
 	if (xrender_format == NULL) {
@@ -244,6 +263,12 @@ _cairo_boilerplate_xlib_fallback_create_surface (const char			 *name,
     XSynchronize (dpy, 1);
 
     screen = DefaultScreen (dpy);
+    if (! _cairo_boilerplate_xlib_check_screen_size (dpy, screen,
+		                                     width, height)) {
+	CAIRO_BOILERPLATE_LOG ("Surface is larger than the Screen.\n");
+	return NULL;
+    }
+
     attr.override_redirect = True;
     xtc->drawable = XCreateWindow (dpy, DefaultRootWindow (dpy),
 				   0, 0,