gtk/gdk/wayland/gdkcursor-wayland.c
Carlos Garnacho a0abdbbdd6 wayland: Reference pixmap-based cursors' surface before handing the wl_buffer
cairo_surface_destroy() is called after the buffer is released, for every
wl_buffer. Windows usually reference their cairo surface before rendering,
so that extra reference is consumed after the buffer is released, so do
the same with cursor surfaces and add an extra reference whenever a cursor
surface change is about to be scheduled.

Otherwise, the GdkWaylandCursor is left with an invalid cairo_surface_t,
which causes crashes the next time it is used.

https://bugzilla.gnome.org/show_bug.cgi?id=735830
2014-09-01 20:46:29 +02:00

369 lines
10 KiB
C

/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#define GDK_PIXBUF_ENABLE_BACKEND
#include <string.h>
#include "gdkprivate-wayland.h"
#include "gdkcursorprivate.h"
#include "gdkdisplay-wayland.h"
#include "gdkwayland.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <wayland-cursor.h>
#define GDK_TYPE_WAYLAND_CURSOR (_gdk_wayland_cursor_get_type ())
#define GDK_WAYLAND_CURSOR(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_WAYLAND_CURSOR, GdkWaylandCursor))
#define GDK_WAYLAND_CURSOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_WAYLAND_CURSOR, GdkWaylandCursorClass))
#define GDK_IS_WAYLAND_CURSOR(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_WAYLAND_CURSOR))
#define GDK_IS_WAYLAND_CURSOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_WAYLAND_CURSOR))
#define GDK_WAYLAND_CURSOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_WAYLAND_CURSOR, GdkWaylandCursorClass))
typedef struct _GdkWaylandCursor GdkWaylandCursor;
typedef struct _GdkWaylandCursorClass GdkWaylandCursorClass;
struct _GdkWaylandCursor
{
GdkCursor cursor;
gchar *name;
struct
{
int hotspot_x, hotspot_y;
int width, height, scale;
cairo_surface_t *cairo_surface;
} surface;
struct wl_cursor *wl_cursor;
};
struct _GdkWaylandCursorClass
{
GdkCursorClass cursor_class;
};
G_DEFINE_TYPE (GdkWaylandCursor, _gdk_wayland_cursor, GDK_TYPE_CURSOR)
void
_gdk_wayland_display_init_cursors (GdkWaylandDisplay *display)
{
display->cursor_cache = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, g_object_unref);
}
void
_gdk_wayland_display_finalize_cursors (GdkWaylandDisplay *display)
{
g_hash_table_destroy (display->cursor_cache);
}
static gboolean
set_cursor_from_theme (GdkWaylandCursor *cursor, struct wl_cursor_theme *theme)
{
struct wl_cursor *c;
c = wl_cursor_theme_get_cursor (theme, cursor->name);
if (!c)
{
g_warning (G_STRLOC ": Unable to load %s from the cursor theme", cursor->name);
/* return the left_ptr cursor as a fallback */
c = wl_cursor_theme_get_cursor (theme, "left_ptr");
if (!c)
return FALSE;
}
cursor->wl_cursor = c;
return TRUE;
}
void
_gdk_wayland_display_update_cursors (GdkWaylandDisplay *display,
struct wl_cursor_theme *theme)
{
GHashTableIter iter;
const char *name;
GdkWaylandCursor *cursor;
g_hash_table_iter_init (&iter, display->cursor_cache);
while (g_hash_table_iter_next (&iter, (gpointer *) &name, (gpointer *) &cursor))
set_cursor_from_theme (cursor, theme);
}
static void
gdk_wayland_cursor_finalize (GObject *object)
{
GdkWaylandCursor *cursor = GDK_WAYLAND_CURSOR (object);
g_free (cursor->name);
if (cursor->surface.cairo_surface)
cairo_surface_destroy (cursor->surface.cairo_surface);
G_OBJECT_CLASS (_gdk_wayland_cursor_parent_class)->finalize (object);
}
static cairo_surface_t *
gdk_wayland_cursor_get_surface (GdkCursor *cursor,
gdouble *x_hot,
gdouble *y_hot)
{
return NULL;
}
struct wl_buffer *
_gdk_wayland_cursor_get_buffer (GdkCursor *cursor,
guint image_index,
int *hotspot_x,
int *hotspot_y,
int *w,
int *h,
int *scale)
{
GdkWaylandCursor *wayland_cursor = GDK_WAYLAND_CURSOR (cursor);
if (wayland_cursor->wl_cursor)
{
struct wl_cursor_image *image;
if (image_index >= wayland_cursor->wl_cursor->image_count)
{
g_warning (G_STRLOC " out of bounds cursor image [%d / %d]",
image_index,
wayland_cursor->wl_cursor->image_count - 1);
image_index = 0;
}
image = wayland_cursor->wl_cursor->images[image_index];
*hotspot_x = image->hotspot_x;
*hotspot_y = image->hotspot_y;
*w = image->width;
*h = image->height;
*scale = 1;
return wl_cursor_image_get_buffer (image);
}
else /* From surface */
{
*hotspot_x = wayland_cursor->surface.hotspot_x;
*hotspot_y = wayland_cursor->surface.hotspot_y;
*w = wayland_cursor->surface.width / wayland_cursor->surface.scale;
*h = wayland_cursor->surface.height / wayland_cursor->surface.scale;
*scale = wayland_cursor->surface.scale;
cairo_surface_reference (wayland_cursor->surface.cairo_surface);
if (wayland_cursor->surface.cairo_surface)
return _gdk_wayland_shm_surface_get_wl_buffer (wayland_cursor->surface.cairo_surface);
else
return NULL;
}
}
guint
_gdk_wayland_cursor_get_next_image_index (GdkCursor *cursor,
guint current_image_index,
guint *next_image_delay)
{
struct wl_cursor *wl_cursor = GDK_WAYLAND_CURSOR (cursor)->wl_cursor;
if (wl_cursor && wl_cursor->image_count > 1)
{
if (current_image_index >= wl_cursor->image_count)
{
g_warning (G_STRLOC " out of bounds cursor image [%d / %d]",
current_image_index, wl_cursor->image_count - 1);
current_image_index = 0;
}
/* Return the time to next image */
if (next_image_delay)
*next_image_delay = wl_cursor->images[current_image_index]->delay;
return (current_image_index + 1) % wl_cursor->image_count;
}
else
return current_image_index;
}
static void
_gdk_wayland_cursor_class_init (GdkWaylandCursorClass *wayland_cursor_class)
{
GdkCursorClass *cursor_class = GDK_CURSOR_CLASS (wayland_cursor_class);
GObjectClass *object_class = G_OBJECT_CLASS (wayland_cursor_class);
object_class->finalize = gdk_wayland_cursor_finalize;
cursor_class->get_surface = gdk_wayland_cursor_get_surface;
}
static void
_gdk_wayland_cursor_init (GdkWaylandCursor *cursor)
{
}
GdkCursor *
_gdk_wayland_display_get_cursor_for_type (GdkDisplay *display,
GdkCursorType cursor_type)
{
GEnumClass *enum_class;
GEnumValue *enum_value;
gchar *cursor_name;
GdkCursor *result;
enum_class = g_type_class_ref (GDK_TYPE_CURSOR_TYPE);
enum_value = g_enum_get_value (enum_class, cursor_type);
cursor_name = g_strdup (enum_value->value_nick);
g_strdelimit (cursor_name, "-", '_');
g_type_class_unref (enum_class);
result = _gdk_wayland_display_get_cursor_for_name (display, cursor_name);
g_free (cursor_name);
return result;
}
GdkCursor *
_gdk_wayland_display_get_cursor_for_name (GdkDisplay *display,
const gchar *name)
{
GdkWaylandCursor *private;
GdkWaylandDisplay *wayland_display = GDK_WAYLAND_DISPLAY (display);
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
private = g_hash_table_lookup (wayland_display->cursor_cache, name);
if (private)
return GDK_CURSOR (g_object_ref (private));
private = g_object_new (GDK_TYPE_WAYLAND_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", display,
NULL);
private->name = g_strdup (name);
private->surface.scale = 1;
/* Blank cursor case */
if (!name || g_str_equal (name, "blank_cursor"))
return GDK_CURSOR (private);
if (!set_cursor_from_theme (private, wayland_display->cursor_theme))
return GDK_CURSOR (private);
/* Insert into cache. */
g_hash_table_insert (wayland_display->cursor_cache, private->name, g_object_ref (private));
return GDK_CURSOR (private);
}
GdkCursor *
_gdk_wayland_display_get_cursor_for_surface (GdkDisplay *display,
cairo_surface_t *surface,
gdouble x,
gdouble y)
{
GdkWaylandCursor *cursor;
GdkWaylandDisplay *wayland_display = GDK_WAYLAND_DISPLAY (display);
cairo_t *cr;
cursor = g_object_new (GDK_TYPE_WAYLAND_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", wayland_display,
NULL);
cursor->name = NULL;
cursor->surface.hotspot_x = x;
cursor->surface.hotspot_y = y;
cursor->surface.scale = 1;
if (surface)
{
#ifdef HAVE_CAIRO_SURFACE_SET_DEVICE_SCALE
{
double sx, sy;
cairo_surface_get_device_scale (surface, &sx, &sy);
cursor->surface.scale = (int)sx;
}
#endif
cursor->surface.width = cairo_image_surface_get_width (surface);
cursor->surface.height = cairo_image_surface_get_height (surface);
}
else
{
cursor->surface.width = 1;
cursor->surface.height = 1;
}
cursor->surface.cairo_surface = _gdk_wayland_display_create_shm_surface (wayland_display,
cursor->surface.width,
cursor->surface.height,
cursor->surface.scale);
if (surface)
{
cr = cairo_create (cursor->surface.cairo_surface);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
}
return GDK_CURSOR (cursor);
}
void
_gdk_wayland_display_get_default_cursor_size (GdkDisplay *display,
guint *width,
guint *height)
{
*width = 32;
*height = 32;
}
void
_gdk_wayland_display_get_maximal_cursor_size (GdkDisplay *display,
guint *width,
guint *height)
{
*width = 256;
*height = 256;
}
gboolean
_gdk_wayland_display_supports_cursor_alpha (GdkDisplay *display)
{
return TRUE;
}
gboolean
_gdk_wayland_display_supports_cursor_color (GdkDisplay *display)
{
return TRUE;
}