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gtk/gdk/wayland/gdkcursor-wayland.c
Chris Cummins 6deff39f74 wayland: Use more explicit out parameter names 
Prevent confusion between positional values and hotspot values.

Signed-off-by: Rob Bradford <rob@linux.intel.com>
2013-04-09 12:52:56 +01:00

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/* 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;
guint serial;
struct
{
int hotspot_x, hotspot_y;
int width, height;
struct wl_buffer *buffer;
} pixbuf;
struct wl_cursor *wl_cursor;
};
struct _GdkWaylandCursorClass
{
GdkCursorClass cursor_class;
};
G_DEFINE_TYPE (GdkWaylandCursor, _gdk_wayland_cursor, GDK_TYPE_CURSOR)
static guint theme_serial = 0;
struct cursor_cache_key
{
GdkCursorType type;
const char *name;
};
static void
add_to_cache (GdkWaylandDisplay *display, GdkWaylandCursor *cursor)
{
display->cursor_cache = g_slist_prepend (display->cursor_cache, cursor);
g_object_ref (cursor);
}
static gint
cache_compare_func (gconstpointer listelem,
gconstpointer target)
{
GdkWaylandCursor *cursor = (GdkWaylandCursor *) listelem;
struct cursor_cache_key* key = (struct cursor_cache_key *) target;
if (cursor->cursor.type != key->type)
return 1; /* No match */
/* Elements marked as pixmap must be named cursors
* (since we don't store normal pixmap cursors
*/
if (key->type == GDK_CURSOR_IS_PIXMAP)
return strcmp (key->name, cursor->name);
return 0; /* Match */
}
static GdkWaylandCursor*
find_in_cache (GdkWaylandDisplay *display,
GdkCursorType type,
const char *name)
{
GSList* res;
struct cursor_cache_key key;
key.type = type;
key.name = name;
res = g_slist_find_custom (display->cursor_cache, &key, cache_compare_func);
if (res)
return (GdkWaylandCursor *) res->data;
return NULL;
}
/* Called by gdk_wayland_display_finalize to flush any cached cursors
* for a dead display.
*/
void
_gdk_wayland_display_finalize_cursors (GdkWaylandDisplay *display)
{
g_slist_foreach (display->cursor_cache, (GFunc) g_object_unref, NULL);
g_slist_free (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)
{
g_slist_foreach (display->cursor_cache, (GFunc) set_cursor_from_theme, theme);
}
static void
gdk_wayland_cursor_finalize (GObject *object)
{
GdkWaylandCursor *cursor = GDK_WAYLAND_CURSOR (object);
g_free (cursor->name);
if (cursor->pixbuf.buffer)
wl_buffer_destroy (cursor->pixbuf.buffer);
G_OBJECT_CLASS (_gdk_wayland_cursor_parent_class)->finalize (object);
}
static GdkPixbuf*
gdk_wayland_cursor_get_image (GdkCursor *cursor)
{
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)
{
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;
return wl_cursor_image_get_buffer (image);
}
else /* From pixbuf */
{
*hotspot_x = wayland_cursor->pixbuf.hotspot_x;
*hotspot_y = wayland_cursor->pixbuf.hotspot_y;
*w = wayland_cursor->pixbuf.width;
*h = wayland_cursor->pixbuf.height;
return wayland_cursor->pixbuf.buffer;
}
}
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_image = gdk_wayland_cursor_get_image;
}
static void
_gdk_wayland_cursor_init (GdkWaylandCursor *cursor)
{
}
/* Used to implement from_pixbuf below */
static void
set_pixbuf (gpointer argb_pixels, int width, int height, GdkPixbuf *pixbuf)
{
int stride, i, n_channels;
unsigned char *pixels, *end, *s, *d;
stride = gdk_pixbuf_get_rowstride(pixbuf);
pixels = gdk_pixbuf_get_pixels(pixbuf);
n_channels = gdk_pixbuf_get_n_channels(pixbuf);
#define MULT(_d,c,a,t) \
do { t = c * a + 0x7f; _d = ((t >> 8) + t) >> 8; } while (0)
if (n_channels == 4)
{
for (i = 0; i < height; i++)
{
s = pixels + i * stride;
end = s + width * 4;
d = argb_pixels + i * width * 4;
while (s < end)
{
unsigned int t;
MULT(d[0], s[2], s[3], t);
MULT(d[1], s[1], s[3], t);
MULT(d[2], s[0], s[3], t);
d[3] = s[3];
s += 4;
d += 4;
}
}
}
else if (n_channels == 3)
{
for (i = 0; i < height; i++)
{
s = pixels + i * stride;
end = s + width * 3;
d = argb_pixels + i * width * 4;
while (s < end)
{
d[0] = s[2];
d[1] = s[1];
d[2] = s[0];
d[3] = 0xff;
s += 3;
d += 4;
}
}
}
}
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 = find_in_cache (wayland_display, GDK_CURSOR_IS_PIXMAP, name);
if (private)
{
/* Cache had it, add a ref for this user */
g_object_ref (private);
return (GdkCursor*) private;
}
private = g_object_new (GDK_TYPE_WAYLAND_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", display,
NULL);
private->name = g_strdup (name);
private->serial = theme_serial;
/* 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);
add_to_cache (wayland_display, private);
return GDK_CURSOR (private);
}
GdkCursor *
_gdk_wayland_display_get_cursor_for_pixbuf (GdkDisplay *display,
GdkPixbuf *pixbuf,
gint x,
gint y)
{
GdkWaylandCursor *cursor;
GdkWaylandDisplay *wayland_display = GDK_WAYLAND_DISPLAY (display);
int stride;
size_t size;
gpointer data;
struct wl_shm_pool *pool;
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
g_return_val_if_fail (0 <= x && x < gdk_pixbuf_get_width (pixbuf), NULL);
g_return_val_if_fail (0 <= y && y < gdk_pixbuf_get_height (pixbuf), NULL);
cursor = g_object_new (GDK_TYPE_WAYLAND_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", wayland_display,
NULL);
cursor->name = NULL;
cursor->serial = theme_serial;
cursor->pixbuf.hotspot_x = x;
cursor->pixbuf.hotspot_y = y;
if (pixbuf)
{
cursor->pixbuf.width = gdk_pixbuf_get_width (pixbuf);
cursor->pixbuf.height = gdk_pixbuf_get_height (pixbuf);
}
else
{
cursor->pixbuf.width = 1;
cursor->pixbuf.height = 1;
}
pool = _create_shm_pool (wayland_display->shm,
cursor->pixbuf.width,
cursor->pixbuf.height,
&size,
&data);
if (pixbuf)
set_pixbuf (data, cursor->pixbuf.width, cursor->pixbuf.height, pixbuf);
else
memset (data, 0, 4);
stride = cursor->pixbuf.width * 4;
cursor->pixbuf.buffer = wl_shm_pool_create_buffer (pool, 0,
cursor->pixbuf.width,
cursor->pixbuf.height,
stride,
WL_SHM_FORMAT_ARGB8888);
wl_shm_pool_destroy (pool);
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;
}
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