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gtk2/gdk/wayland/gdkcursor-wayland.c
Rob Bradford 93a338245a wayland: Switch to new wayland cursors mechanism
2012-07-12 15:58:38 +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;
int hotspot_x, hotspot_y;
int width, height;
struct wl_buffer *buffer;
};
struct _GdkWaylandCursorClass
{
GdkCursorClass cursor_class;
};
G_DEFINE_TYPE (GdkWaylandCursor, _gdk_wayland_cursor, GDK_TYPE_CURSOR)
static guint theme_serial = 0;
static void
gdk_wayland_cursor_finalize (GObject *object)
{
GdkWaylandCursor *cursor = GDK_WAYLAND_CURSOR (object);
g_free (cursor->name);
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,
int *x,
int *y,
int *w,
int *h)
{
GdkWaylandCursor *wayland_cursor = GDK_WAYLAND_CURSOR (cursor);
*x = wayland_cursor->hotspot_x;
*y = wayland_cursor->hotspot_y;
*w = wayland_cursor->width;
*h = wayland_cursor->height;
return wayland_cursor->buffer;
}
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)
{
}
/* Use to implement from_pixbuf below */
#if 0
static void
set_pixbuf (GdkWaylandCursor *cursor, GdkPixbuf *pixbuf)
{
int stride, i, n_channels;
unsigned char *pixels, *end, *argb_pixels, *s, *d;
stride = gdk_pixbuf_get_rowstride(pixbuf);
pixels = gdk_pixbuf_get_pixels(pixbuf);
n_channels = gdk_pixbuf_get_n_channels(pixbuf);
argb_pixels = cursor->map;
#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 < cursor->height; i++)
{
s = pixels + i * stride;
end = s + cursor->width * 4;
d = argb_pixels + i * cursor->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 < cursor->height; i++)
{
s = pixels + i * stride;
end = s + cursor->width * 3;
d = argb_pixels + i * cursor->width * 4;
while (s < end)
{
d[0] = s[2];
d[1] = s[1];
d[2] = s[0];
d[3] = 0xff;
s += 3;
d += 4;
}
}
}
}
static GdkCursor *
create_cursor(GdkWaylandDisplay *display, GdkPixbuf *pixbuf, int x, int y)
{
GdkWaylandCursor *cursor;
int stride, fd;
char *filename;
GError *error = NULL;
struct wl_shm_pool *pool;
cursor = g_object_new (GDK_TYPE_WAYLAND_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", display,
NULL);
cursor->name = NULL;
cursor->serial = theme_serial;
cursor->x = x;
cursor->y = y;
if (pixbuf)
{
cursor->width = gdk_pixbuf_get_width (pixbuf);
cursor->height = gdk_pixbuf_get_height (pixbuf);
}
else
{
cursor->width = 1;
cursor->height = 1;
}
stride = cursor->width * 4;
cursor->size = stride * cursor->height;
fd = g_file_open_tmp("wayland-shm-XXXXXX", &filename, &error);
if (fd < 0)
{
g_critical (G_STRLOC ": Error opening temporary file for buffer: %s",
error->message);
g_error_free (error);
return NULL;
}
unlink (filename);
g_free (filename);
if (ftruncate(fd, cursor->size) < 0)
{
g_critical (G_STRLOC ": Error truncating file for buffer: %s",
g_strerror (errno));
close(fd);
return NULL;
}
cursor->map = mmap(NULL, cursor->size,
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (cursor->map == MAP_FAILED)
{
g_critical (G_STRLOC ": Error mmap'ing file for buffer: %s",
g_strerror (errno));
close(fd);
return NULL;
}
if (pixbuf)
set_pixbuf (cursor, pixbuf);
else
memset (cursor->map, 0, 4);
cursor->buffer = wl_shm_create_buffer(display->shm,
fd,
cursor->width,
cursor->height,
stride, WL_SHM_FORMAT_ARGB8888);
close(fd);
return GDK_CURSOR (cursor);
}
#endif
/* TODO: Extend this table */
static const struct {
GdkCursorType type;
const gchar *cursor_name;
} cursor_mapping[] = {
{ GDK_BLANK_CURSOR, NULL },
{ GDK_HAND1, "hand1" },
{ GDK_HAND2, "hand2" },
{ GDK_LEFT_PTR, "left_ptr" },
{ GDK_SB_H_DOUBLE_ARROW, "sb_h_double_arrow" },
{ GDK_SB_V_DOUBLE_ARROW, "sb_v_double_arrow" },
{ GDK_XTERM, "xterm" },
{ GDK_BOTTOM_RIGHT_CORNER, "bottom_right_corner" }
};
GdkCursor *
_gdk_wayland_display_get_cursor_for_type (GdkDisplay *display,
GdkCursorType cursor_type)
{
int i;
for (i = 0; i < G_N_ELEMENTS (cursor_mapping); i++)
{
if (cursor_mapping[i].type == cursor_type)
break;
}
if (i == G_N_ELEMENTS (cursor_mapping))
{
g_warning ("Unhandled cursor type %d, falling back to blank\n",
cursor_type);
i = 0;
}
return _gdk_wayland_display_get_cursor_for_name (display,
cursor_mapping[i].cursor_name);
}
GdkCursor *
_gdk_wayland_display_get_cursor_for_name (GdkDisplay *display,
const gchar *name)
{
GdkWaylandCursor *private;
GdkWaylandDisplay *wayland_display = GDK_WAYLAND_DISPLAY (display);
struct wl_cursor *cursor;
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
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)
return GDK_CURSOR (private);
cursor = wl_cursor_theme_get_cursor (wayland_display->cursor_theme,
name);
if (!cursor)
{
g_warning (G_STRLOC ": Unable to load %s from the cursor theme", name);
g_object_unref (private);
return NULL;
}
/* TODO: Do something clever so we can do animated cursors - move the
* wl_pointer_set_cursor to a function here so that we can do the magic to
* iterate through
*/
private->hotspot_x = cursor->images[0]->hotspot_x;
private->hotspot_y = cursor->images[0]->hotspot_y;
private->width = cursor->images[0]->width;
private->height = cursor->images[0]->height;
private->buffer = wl_cursor_image_get_buffer(cursor->images[0]);
return GDK_CURSOR (private);
}
/* TODO: Needs implementing */
GdkCursor *
_gdk_wayland_display_get_cursor_for_pixbuf (GdkDisplay *display,
GdkPixbuf *pixbuf,
gint x,
gint y)
{
GdkWaylandCursor *private;
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);
private = g_object_new (GDK_TYPE_WAYLAND_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", display,
NULL);
private->name = NULL;
private->serial = theme_serial;
return GDK_CURSOR (private);
}
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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