[cairo-commit] 4 commits - src/cairo-xlib-display.c src/cairo-xlib-private.h src/cairo-xlib-screen.c src/cairo-xlib-surface.c src/cairo-xlib-visual.c
Chris Wilson
ickle at kemper.freedesktop.org
Thu May 6 02:48:00 PDT 2010
src/cairo-xlib-display.c | 84 ++++++------------------------
src/cairo-xlib-private.h | 27 ++-------
src/cairo-xlib-screen.c | 128 ++++++++++-------------------------------------
src/cairo-xlib-surface.c | 38 ++++---------
src/cairo-xlib-visual.c | 2
5 files changed, 68 insertions(+), 211 deletions(-)
New commits:
commit 88986fdbef795c61cd60231046663d3cd80b4947
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date: Thu May 6 10:46:49 2010 +0100
xlib: Remove reference counting for cairo_xlib_screen_t
The screen is owned by the cairo_xlib_display_t device, so we can
simplify and close the refleak by removing the surplus reference
counting.
diff --git a/src/cairo-xlib-display.c b/src/cairo-xlib-display.c
index afa7532..a86c206 100644
--- a/src/cairo-xlib-display.c
+++ b/src/cairo-xlib-display.c
@@ -73,10 +73,10 @@ _cairo_xlib_remove_close_display_hook_internal (cairo_xlib_display_t *display,
static void
_cairo_xlib_call_close_display_hooks (cairo_xlib_display_t *display)
{
- cairo_xlib_screen_t *screen;
- cairo_xlib_hook_t *hook;
+ cairo_xlib_screen_t *screen;
+ cairo_xlib_hook_t *hook;
- for (screen = display->screens; screen != NULL; screen = screen->next)
+ cairo_list_foreach_entry (screen, cairo_xlib_screen_t, &display->screens, link)
_cairo_xlib_screen_close_display (display, screen);
while (TRUE) {
@@ -92,22 +92,6 @@ _cairo_xlib_call_close_display_hooks (cairo_xlib_display_t *display)
}
static void
-_cairo_xlib_display_discard_screens (cairo_xlib_display_t *display)
-{
- cairo_xlib_screen_t *screens;
-
- screens = display->screens;
- display->screens = NULL;
-
- while (screens != NULL) {
- cairo_xlib_screen_t *screen = screens;
- screens = screen->next;
-
- _cairo_xlib_screen_destroy (screen);
- }
-}
-
-static void
_cairo_xlib_display_finish (void *abstract_display)
{
cairo_xlib_display_t *display = abstract_display;
@@ -132,6 +116,12 @@ _cairo_xlib_display_destroy (void *abstract_display)
}
_cairo_freelist_fini (&display->wq_freelist);
+ while (! cairo_list_is_empty (&display->screens)) {
+ _cairo_xlib_screen_destroy (cairo_list_first_entry (&display->screens,
+ cairo_xlib_screen_t,
+ link));
+ }
+
free (display);
}
@@ -216,7 +206,6 @@ _cairo_xlib_close_display (Display *dpy, XExtCodes *codes)
_cairo_xlib_display_notify (display);
_cairo_xlib_call_close_display_hooks (display);
- _cairo_xlib_display_discard_screens (display);
/* catch any that arrived before marking the display as closed */
_cairo_xlib_display_notify (display);
@@ -353,7 +342,7 @@ _cairo_xlib_device_create (Display *dpy)
cairo_device_reference (&display->base); /* add one for the CloseDisplay */
display->display = dpy;
- display->screens = NULL;
+ cairo_list_init (&display->screens);
display->workqueue = NULL;
display->close_display_hooks = NULL;
display->closed = FALSE;
@@ -610,56 +599,21 @@ _cairo_xlib_display_get_xrender_format (cairo_xlib_display_t *display,
return xrender_format;
}
-void
-_cairo_xlib_display_remove_screen (cairo_xlib_display_t *display,
- cairo_xlib_screen_t *screen)
-{
- cairo_xlib_screen_t **prev;
- cairo_xlib_screen_t *list;
-
- for (prev = &display->screens; (list = *prev); prev = &list->next) {
- if (list == screen) {
- *prev = screen->next;
- break;
- }
- }
-}
-
-cairo_status_t
+cairo_xlib_screen_t *
_cairo_xlib_display_get_screen (cairo_xlib_display_t *display,
- Screen *screen,
- cairo_xlib_screen_t **out)
+ Screen *screen)
{
- cairo_xlib_screen_t *info = NULL, **prev;
-
- if (display->closed)
- return _cairo_error (CAIRO_STATUS_SURFACE_FINISHED);
+ cairo_xlib_screen_t *info;
- for (prev = &display->screens; (info = *prev); prev = &(*prev)->next) {
+ cairo_list_foreach_entry (info, cairo_xlib_screen_t, &display->screens, link) {
if (info->screen == screen) {
- /*
- * MRU the list
- */
- if (prev != &display->screens) {
- *prev = info->next;
- info->next = display->screens;
- display->screens = info;
- }
- break;
- }
+ if (display->screens.next != &info->link)
+ cairo_list_move (&info->link, &display->screens);
+ return info;
+ }
}
- *out = info;
- return CAIRO_STATUS_SUCCESS;
-}
-
-
-void
-_cairo_xlib_display_add_screen (cairo_xlib_display_t *display,
- cairo_xlib_screen_t *screen)
-{
- screen->next = display->screens;
- display->screens = screen;
+ return NULL;
}
void
diff --git a/src/cairo-xlib-private.h b/src/cairo-xlib-private.h
index 345f3e1..24bf5e3 100644
--- a/src/cairo-xlib-private.h
+++ b/src/cairo-xlib-private.h
@@ -71,7 +71,7 @@ struct _cairo_xlib_display {
cairo_xlib_display_t *next;
Display *display;
- cairo_xlib_screen_t *screens;
+ cairo_list_t screens;
int render_major;
int render_minor;
@@ -98,8 +98,7 @@ typedef struct _cairo_xlib_visual_info {
} cairo_xlib_visual_info_t;
struct _cairo_xlib_screen {
- cairo_xlib_screen_t *next;
- cairo_reference_count_t ref_count;
+ cairo_list_t link;
cairo_device_t *device;
Screen *screen;
@@ -116,18 +115,9 @@ struct _cairo_xlib_screen {
cairo_private cairo_device_t *
_cairo_xlib_device_create (Display *display);
-cairo_private void
-_cairo_xlib_display_add_screen (cairo_xlib_display_t *display,
- cairo_xlib_screen_t *screen);
-
-cairo_private cairo_status_t
+cairo_private cairo_xlib_screen_t *
_cairo_xlib_display_get_screen (cairo_xlib_display_t *display,
- Screen *screen,
- cairo_xlib_screen_t **out);
-
-cairo_private void
-_cairo_xlib_display_remove_screen (cairo_xlib_display_t *display,
- cairo_xlib_screen_t *screen);
+ Screen *screen);
cairo_private void
_cairo_xlib_add_close_display_hook (cairo_xlib_display_t *display, cairo_xlib_hook_t *hook);
@@ -170,8 +160,6 @@ _cairo_xlib_screen_get (Display *dpy,
Screen *screen,
cairo_xlib_screen_t **out);
-cairo_private cairo_xlib_screen_t *
-_cairo_xlib_screen_reference (cairo_xlib_screen_t *info);
cairo_private void
_cairo_xlib_screen_destroy (cairo_xlib_screen_t *info);
@@ -207,6 +195,6 @@ _cairo_xlib_visual_info_create (Display *dpy,
cairo_xlib_visual_info_t **out);
cairo_private void
-_cairo_xlib_visual_info_destroy (Display *dpy, cairo_xlib_visual_info_t *info);
+_cairo_xlib_visual_info_destroy (cairo_xlib_visual_info_t *info);
#endif /* CAIRO_XLIB_PRIVATE_H */
diff --git a/src/cairo-xlib-screen.c b/src/cairo-xlib-screen.c
index d1d9cf6..b094eaf 100644
--- a/src/cairo-xlib-screen.c
+++ b/src/cairo-xlib-screen.c
@@ -256,16 +256,6 @@ _cairo_xlib_init_screen_font_options (Display *dpy,
cairo_font_options_set_hint_metrics (&info->font_options, CAIRO_HINT_METRICS_ON);
}
-cairo_xlib_screen_t *
-_cairo_xlib_screen_reference (cairo_xlib_screen_t *info)
-{
- assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&info->ref_count));
-
- _cairo_reference_count_inc (&info->ref_count);
-
- return info;
-}
-
void
_cairo_xlib_screen_close_display (cairo_xlib_display_t *display,
cairo_xlib_screen_t *info)
@@ -274,37 +264,25 @@ _cairo_xlib_screen_close_display (cairo_xlib_display_t *display,
int i;
dpy = display->display;
+
for (i = 0; i < ARRAY_LENGTH (info->gc); i++) {
if ((info->gc_depths >> (8*i)) & 0xff)
XFreeGC (dpy, info->gc[i]);
}
info->gc_depths = 0;
-
- while (! cairo_list_is_empty (&info->visuals)) {
- _cairo_xlib_visual_info_destroy (dpy,
- cairo_list_first_entry (&info->visuals,
- cairo_xlib_visual_info_t,
- link));
- }
}
void
_cairo_xlib_screen_destroy (cairo_xlib_screen_t *info)
{
- cairo_xlib_display_t *display;
-
- assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&info->ref_count));
-
- if (! _cairo_reference_count_dec_and_test (&info->ref_count))
- return;
-
- if (! _cairo_xlib_display_acquire (info->device, &display)) {
- _cairo_xlib_display_remove_screen (display, info);
- _cairo_xlib_screen_close_display (display, info);
-
- cairo_device_release (&display->base);
+ while (! cairo_list_is_empty (&info->visuals)) {
+ _cairo_xlib_visual_info_destroy (cairo_list_first_entry (&info->visuals,
+ cairo_xlib_visual_info_t,
+ link));
}
+ cairo_list_del (&info->link);
+
free (info);
}
@@ -327,12 +305,9 @@ _cairo_xlib_screen_get (Display *dpy,
if (unlikely (status))
goto CLEANUP_DEVICE;
- status = _cairo_xlib_display_get_screen (display, screen, &info);
- if (unlikely (status))
- goto CLEANUP_DISPLAY;
-
+ info = _cairo_xlib_display_get_screen (display, screen);
if (info != NULL) {
- *out = _cairo_xlib_screen_reference (info);
+ *out = info;
goto CLEANUP_DISPLAY;
}
@@ -342,7 +317,6 @@ _cairo_xlib_screen_get (Display *dpy,
goto CLEANUP_DISPLAY;
}
- CAIRO_REFERENCE_COUNT_INIT (&info->ref_count, 2); /* Add one for display cache */
info->device = device;
info->screen = screen;
info->has_font_options = FALSE;
@@ -350,8 +324,7 @@ _cairo_xlib_screen_get (Display *dpy,
memset (info->gc, 0, sizeof (info->gc));
cairo_list_init (&info->visuals);
-
- _cairo_xlib_display_add_screen (display, info);
+ cairo_list_add (&info->link, &display->screens);
*out = info;
diff --git a/src/cairo-xlib-surface.c b/src/cairo-xlib-surface.c
index fa7d645..3b01fde 100644
--- a/src/cairo-xlib-surface.c
+++ b/src/cairo-xlib-surface.c
@@ -415,8 +415,6 @@ _cairo_xlib_surface_finish (void *abstract_surface)
cairo_device_release (&display->base);
- _cairo_xlib_screen_destroy (surface->screen);
-
cairo_region_destroy (surface->clip_region);
return status;
@@ -2947,8 +2945,6 @@ _cairo_xlib_surface_create_internal (cairo_xlib_screen_t *screen,
cairo_xlib_surface_t *surface;
cairo_xlib_display_t *display;
cairo_status_t status;
-
- CAIRO_MUTEX_INITIALIZE ();
if (depth == 0) {
if (xrender_format) {
@@ -3019,7 +3015,7 @@ found:
surface->close_display_hook.func = _cairo_xlib_surface_detach_display;
_cairo_xlib_add_close_display_hook (display,
&surface->close_display_hook);
-
+
cairo_device_release (&display->base);
_cairo_surface_init (&surface->base,
@@ -3027,7 +3023,7 @@ found:
screen->device,
_xrender_format_to_content (xrender_format));
- surface->screen = _cairo_xlib_screen_reference (screen);
+ surface->screen = screen;
surface->drawable = drawable;
surface->owns_pixmap = FALSE;
@@ -3161,7 +3157,6 @@ cairo_xlib_surface_create (Display *dpy,
{
Screen *scr;
cairo_xlib_screen_t *screen;
- cairo_surface_t *surface;
cairo_status_t status;
if (width > XLIB_COORD_MAX || height > XLIB_COORD_MAX) {
@@ -3179,12 +3174,9 @@ cairo_xlib_surface_create (Display *dpy,
X_DEBUG ((dpy, "create (drawable=%x)", (unsigned int) drawable));
- surface = _cairo_xlib_surface_create_internal (screen, drawable,
- visual, NULL,
- width, height, 0);
- _cairo_xlib_screen_destroy (screen);
-
- return surface;
+ return _cairo_xlib_surface_create_internal (screen, drawable,
+ visual, NULL,
+ width, height, 0);
}
slim_hidden_def (cairo_xlib_surface_create);
@@ -3209,7 +3201,6 @@ cairo_xlib_surface_create_for_bitmap (Display *dpy,
int height)
{
cairo_xlib_screen_t *screen;
- cairo_surface_t *surface;
cairo_status_t status;
if (width > XLIB_COORD_MAX || height > XLIB_COORD_MAX)
@@ -3221,12 +3212,9 @@ cairo_xlib_surface_create_for_bitmap (Display *dpy,
X_DEBUG ((dpy, "create_for_bitmap (drawable=%x)", (unsigned int) bitmap));
- surface = _cairo_xlib_surface_create_internal (screen, bitmap,
- NULL, NULL,
- width, height, 1);
- _cairo_xlib_screen_destroy (screen);
-
- return surface;
+ return _cairo_xlib_surface_create_internal (screen, bitmap,
+ NULL, NULL,
+ width, height, 1);
}
#if CAIRO_HAS_XLIB_XRENDER_SURFACE
@@ -3259,7 +3247,6 @@ cairo_xlib_surface_create_with_xrender_format (Display *dpy,
int height)
{
cairo_xlib_screen_t *screen;
- cairo_surface_t *surface;
cairo_status_t status;
if (width > XLIB_COORD_MAX || height > XLIB_COORD_MAX)
@@ -3271,12 +3258,9 @@ cairo_xlib_surface_create_with_xrender_format (Display *dpy,
X_DEBUG ((dpy, "create_with_xrender_format (drawable=%x)", (unsigned int) drawable));
- surface = _cairo_xlib_surface_create_internal (screen, drawable,
- NULL, format,
- width, height, 0);
- _cairo_xlib_screen_destroy (screen);
-
- return surface;
+ return _cairo_xlib_surface_create_internal (screen, drawable,
+ NULL, format,
+ width, height, 0);
}
slim_hidden_def (cairo_xlib_surface_create_with_xrender_format);
diff --git a/src/cairo-xlib-visual.c b/src/cairo-xlib-visual.c
index a76bf35..e076ed0 100644
--- a/src/cairo-xlib-visual.c
+++ b/src/cairo-xlib-visual.c
@@ -180,7 +180,7 @@ _cairo_xlib_visual_info_create (Display *dpy,
}
void
-_cairo_xlib_visual_info_destroy (Display *dpy, cairo_xlib_visual_info_t *info)
+_cairo_xlib_visual_info_destroy (cairo_xlib_visual_info_t *info)
{
/* No need for XFreeColors() whilst using DefaultColormap */
free (info);
commit 632fabc77d89254e2e6915148fa870f23c2a5722
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date: Thu May 6 10:10:38 2010 +0100
xlib: Convert visual array to a cairo_list_t
It's simpler and more memory efficient.
diff --git a/src/cairo-xlib-private.h b/src/cairo-xlib-private.h
index 2f27ae8..345f3e1 100644
--- a/src/cairo-xlib-private.h
+++ b/src/cairo-xlib-private.h
@@ -43,6 +43,7 @@
#include "cairo-compiler-private.h"
#include "cairo-device-private.h"
#include "cairo-freelist-private.h"
+#include "cairo-list-private.h"
#include "cairo-reference-count-private.h"
#include "cairo-types-private.h"
@@ -87,6 +88,7 @@ struct _cairo_xlib_display {
};
typedef struct _cairo_xlib_visual_info {
+ cairo_list_t link;
VisualID visualid;
struct { uint8_t a, r, g, b; } colors[256];
uint8_t cube_to_pseudocolor[CUBE_SIZE][CUBE_SIZE][CUBE_SIZE];
@@ -108,7 +110,7 @@ struct _cairo_xlib_screen {
GC gc[4];
cairo_atomic_int_t gc_depths; /* 4 x uint8_t */
- cairo_array_t visuals;
+ cairo_list_t visuals;
};
cairo_private cairo_device_t *
diff --git a/src/cairo-xlib-screen.c b/src/cairo-xlib-screen.c
index 500fc9e..d1d9cf6 100644
--- a/src/cairo-xlib-screen.c
+++ b/src/cairo-xlib-screen.c
@@ -270,25 +270,22 @@ void
_cairo_xlib_screen_close_display (cairo_xlib_display_t *display,
cairo_xlib_screen_t *info)
{
- cairo_xlib_visual_info_t **visuals;
Display *dpy;
- cairo_atomic_int_t old;
int i;
dpy = display->display;
-
- old = info->gc_depths;
- info->gc_depths = 0;
-
for (i = 0; i < ARRAY_LENGTH (info->gc); i++) {
- if ((old >> (8*i)) & 0xff)
+ if ((info->gc_depths >> (8*i)) & 0xff)
XFreeGC (dpy, info->gc[i]);
}
+ info->gc_depths = 0;
- visuals = _cairo_array_index (&info->visuals, 0);
- for (i = 0; i < _cairo_array_num_elements (&info->visuals); i++)
- _cairo_xlib_visual_info_destroy (dpy, visuals[i]);
- _cairo_array_truncate (&info->visuals, 0);
+ while (! cairo_list_is_empty (&info->visuals)) {
+ _cairo_xlib_visual_info_destroy (dpy,
+ cairo_list_first_entry (&info->visuals,
+ cairo_xlib_visual_info_t,
+ link));
+ }
}
void
@@ -308,8 +305,6 @@ _cairo_xlib_screen_destroy (cairo_xlib_screen_t *info)
cairo_device_release (&display->base);
}
- _cairo_array_fini (&info->visuals);
-
free (info);
}
@@ -354,8 +349,7 @@ _cairo_xlib_screen_get (Display *dpy,
info->gc_depths = 0;
memset (info->gc, 0, sizeof (info->gc));
- _cairo_array_init (&info->visuals,
- sizeof (cairo_xlib_visual_info_t*));
+ cairo_list_init (&info->visuals);
_cairo_xlib_display_add_screen (display, info);
@@ -436,56 +430,32 @@ _cairo_xlib_screen_put_gc (cairo_xlib_display_t *display,
cairo_status_t
_cairo_xlib_screen_get_visual_info (cairo_xlib_display_t *display,
cairo_xlib_screen_t *info,
- Visual *visual,
+ Visual *v,
cairo_xlib_visual_info_t **out)
{
- cairo_xlib_visual_info_t **visuals, *ret = NULL;
+ cairo_xlib_visual_info_t *visual;
cairo_status_t status;
- int i, n_visuals;
- visuals = _cairo_array_index (&info->visuals, 0);
- n_visuals = _cairo_array_num_elements (&info->visuals);
- for (i = 0; i < n_visuals; i++) {
- if (visuals[i]->visualid == visual->visualid) {
- ret = visuals[i];
- break;
+ cairo_list_foreach_entry (visual,
+ cairo_xlib_visual_info_t,
+ &info->visuals,
+ link)
+ {
+ if (visual->visualid == v->visualid) {
+ *out = visual;
+ return CAIRO_STATUS_SUCCESS;
}
}
- if (ret != NULL) {
- *out = ret;
- return CAIRO_STATUS_SUCCESS;
- }
-
status = _cairo_xlib_visual_info_create (display->display,
XScreenNumberOfScreen (info->screen),
- visual->visualid,
- &ret);
+ v->visualid,
+ &visual);
if (unlikely (status))
return status;
- if (n_visuals != _cairo_array_num_elements (&info->visuals)) {
- /* check that another thread has not added our visual */
- int new_visuals = _cairo_array_num_elements (&info->visuals);
- visuals = _cairo_array_index (&info->visuals, 0);
- for (i = n_visuals; i < new_visuals; i++) {
- if (visuals[i]->visualid == visual->visualid) {
- _cairo_xlib_visual_info_destroy (display->display, ret);
- ret = visuals[i];
- break;
- }
- }
- if (i == new_visuals)
- status = _cairo_array_append (&info->visuals, &ret);
- } else
- status = _cairo_array_append (&info->visuals, &ret);
-
- if (unlikely (status)) {
- _cairo_xlib_visual_info_destroy (display->display, ret);
- return status;
- }
-
- *out = ret;
+ cairo_list_add (&visual->link, &info->visuals);
+ *out = visual;
return CAIRO_STATUS_SUCCESS;
}
commit 20d75bdadc897be238ceb4d2d02f079e469144e4
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date: Thu May 6 10:03:36 2010 +0100
xlib: Remove screen->has_render
Use the info from the display instead.
diff --git a/src/cairo-xlib-private.h b/src/cairo-xlib-private.h
index e7ee59d..2f27ae8 100644
--- a/src/cairo-xlib-private.h
+++ b/src/cairo-xlib-private.h
@@ -101,7 +101,6 @@ struct _cairo_xlib_screen {
cairo_device_t *device;
Screen *screen;
- cairo_bool_t has_render;
cairo_bool_t has_font_options;
cairo_font_options_t font_options;
diff --git a/src/cairo-xlib-screen.c b/src/cairo-xlib-screen.c
index 7f96a07..500fc9e 100644
--- a/src/cairo-xlib-screen.c
+++ b/src/cairo-xlib-screen.c
@@ -167,16 +167,16 @@ _cairo_xlib_init_screen_font_options (Display *dpy,
if (!get_integer_default (dpy, "rgba", &xft_rgba))
{
+ cairo_xlib_display_t *display = (cairo_xlib_display_t *) info->device;
+
xft_rgba = FC_RGBA_UNKNOWN;
#if RENDER_MAJOR > 0 || RENDER_MINOR >= 6
- if (info->has_render)
- {
+ if (display->render_major > 0 || display->render_minor >= 6) {
int render_order = XRenderQuerySubpixelOrder (dpy,
XScreenNumberOfScreen (info->screen));
- switch (render_order)
- {
+ switch (render_order) {
default:
case SubPixelUnknown:
xft_rgba = FC_RGBA_UNKNOWN;
@@ -350,7 +350,6 @@ _cairo_xlib_screen_get (Display *dpy,
CAIRO_REFERENCE_COUNT_INIT (&info->ref_count, 2); /* Add one for display cache */
info->device = device;
info->screen = screen;
- info->has_render = FALSE;
info->has_font_options = FALSE;
info->gc_depths = 0;
memset (info->gc, 0, sizeof (info->gc));
@@ -358,14 +357,6 @@ _cairo_xlib_screen_get (Display *dpy,
_cairo_array_init (&info->visuals,
sizeof (cairo_xlib_visual_info_t*));
- if (screen) {
- int event_base, error_base;
-
- info->has_render =
- XRenderQueryExtension (dpy, &event_base, &error_base) &&
- (XRenderFindVisualFormat (dpy, DefaultVisual (dpy, DefaultScreen (dpy))) != 0);
- }
-
_cairo_xlib_display_add_screen (display, info);
*out = info;
commit 9e0b716ecf1b27d74e63f25a055d8120d8d53309
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date: Thu May 6 09:58:46 2010 +0100
xlib: Remove obsolete comment, there is no race anymore
The display lock is now held for the duration of the screen creation, so
there is no race. Remove the false comment.
diff --git a/src/cairo-xlib-screen.c b/src/cairo-xlib-screen.c
index cfecbb5..7f96a07 100644
--- a/src/cairo-xlib-screen.c
+++ b/src/cairo-xlib-screen.c
@@ -366,10 +366,6 @@ _cairo_xlib_screen_get (Display *dpy,
(XRenderFindVisualFormat (dpy, DefaultVisual (dpy, DefaultScreen (dpy))) != 0);
}
- /* Small window of opportunity for two screen infos for the same
- * Screen - just wastes a little bit of memory but should not cause
- * any corruption.
- */
_cairo_xlib_display_add_screen (display, info);
*out = info;
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