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[xlib] Interim CAIRO_DEBUG variable to specify xrender level

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Use CAIRO_DEBUG=xrender-version=x.y to override what the server reports.
Useful to test cairo's behaviour against older servers.
This commit is contained in:
Chris Wilson 2009-09-20 18:45:09 +01:00
parent 531e804598
commit 878cef62b5
1 changed files with 19 additions and 4 deletions
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23
src/cairo-xlib-display.c
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@ -237,7 +237,7 @@ _cairo_xlib_display_get (Display *dpy,
cairo_xlib_display_t *display;
cairo_xlib_display_t **prev;
XExtCodes *codes;
int render_major, render_minor;
const char *env;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
/* There is an apparent deadlock between this mutex and the
@ -281,7 +281,24 @@ _cairo_xlib_display_get (Display *dpy,
* add our hook. For now, that means Render, so we call into its
* QueryVersion function to ensure it gets initialized.
*/
XRenderQueryVersion (dpy, &render_major, &render_minor);
display->render_major = display->render_minor = -1;
XRenderQueryVersion (dpy, &display->render_major, &display->render_minor);
env = getenv ("CAIRO_DEBUG");
if (env != NULL && (env = strstr (env, "xrender-version=")) != NULL) {
int max_render_major, max_render_minor;
env += sizeof ("xrender-version=") - 1;
if (sscanf (env, "%d.%d", &max_render_major, &max_render_minor) != 2)
max_render_major = max_render_minor = -1;
if (max_render_major < display->render_major ||
(max_render_major == display->render_major &&
max_render_minor < display->render_minor))
{
display->render_major = max_render_major;
display->render_minor = max_render_minor;
}
}
codes = XAddExtension (dpy);
if (unlikely (codes == NULL)) {
@ -303,8 +320,6 @@ _cairo_xlib_display_get (Display *dpy,
display->close_display_hooks = NULL;
display->closed = FALSE;
display->render_major = render_major;
display->render_minor = render_minor;
memset (display->cached_xrender_formats, 0,
sizeof (display->cached_xrender_formats));