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[cairo-boilerplate-xlib] Check that the surface will fit in the screen.

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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.
This commit is contained in:
Chris Wilson 2007-08-24 13:40:26 +01:00
parent a29544a0b6
commit 8894894d9d
1 changed files with 25 additions and 0 deletions
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25
boilerplate/cairo-boilerplate-xlib.c
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@ -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,