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gtk/gdk/wayland/gdkcursor-wayland.c
Jonas Ådahl 2943bfef46 wayland: Always apply scaling factor to cursor hotspot and dimension 
Prior to this patch, the hotspot would be passed in buffer coordinate
space. Where this were ever tested, i.e. in a patched mutter, the
server interpreted them incorrectly, which meant it went undiscovered.
In the updated mutter patches the incorrect behavior in GTK+ was
discovered due to the behavior in mutter was corrected.

In the themed cursor case, the dimensions were not correctly scaled
either, but this had no negative visible effect because the dimension is
only used for reporting damage tracking, and passing a bigger damage
region than surface has no negative visible effects.

https://bugzilla.gnome.org/show_bug.cgi?id=752616
2015-07-20 17:36:38 +08:00

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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;
struct
{
int hotspot_x, hotspot_y;
int width, height, scale;
cairo_surface_t *cairo_surface;
} surface;
struct wl_cursor *wl_cursor;
int scale;
};
struct _GdkWaylandCursorClass
{
GdkCursorClass cursor_class;
};
GType _gdk_wayland_cursor_get_type (void);
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 const struct {
const gchar *css_name, *traditional_name;
} name_map[] = {
{ "default", "left_ptr" },
{ "pointer", "hand" },
{ "progress", "left_ptr_watch" },
{ "wait", "watch" },
{ "cell", "crosshair" },
{ "crosshair", "cross" },
{ "text", "xterm" },
{ "alias", "dnd-link" },
{ "copy", "dnd-copy" },
{ "no-drop", "dnd-none" },
{ "not-allowed", "crossed_circle" },
{ "grab", "hand2" },
{ "col-resize", "h_double_arrow" },
{ "row-resize", "v_double_arrow" },
{ "n-resize", "top_side" },
{ "e-resize", "right_side" },
{ "s-resize", "bottom_side" },
{ "w-resize", "left_side" },
{ "ne-resize", "top_right_corner" },
{ "nw-resize", "top_left_corner" },
{ "se-resize", "bottom_right_corner" },
{ "sw-resize", "bottom_left_corner" },
{ "ew-resize", "h_double_arrow" },
{ "ns-resize", "v_double_arrow" },
{ "nesw-resize", "fd_double_arrow" },
{ "nwse-resize", "bd_double_arrow" },
{ NULL, NULL }
};
static const gchar *
name_fallback (const gchar *name)
{
gint i;
for (i = 0; name_map[i].css_name; i++)
{
if (g_str_equal (name_map[i].css_name, name))
return name_map[i].traditional_name;
}
return "left_ptr";
}
static gboolean
_gdk_wayland_cursor_update (GdkWaylandDisplay *wayland_display,
GdkWaylandCursor *cursor)
{
struct wl_cursor *c;
struct wl_cursor_theme *theme;
/* Do nothing if this is not a wl_cursor cursor. */
if (cursor->name == NULL)
return FALSE;
theme = _gdk_wayland_display_get_scaled_cursor_theme (wayland_display,
cursor->scale);
c = wl_cursor_theme_get_cursor (theme, cursor->name);
if (!c)
c = wl_cursor_theme_get_cursor (theme, name_fallback (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)
{
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))
_gdk_wayland_cursor_update (display, cursor);
}
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 / wayland_cursor->scale;
*hotspot_y = image->hotspot_y / wayland_cursor->scale;
*w = image->width / wayland_cursor->scale;
*h = image->height / wayland_cursor->scale;
*scale = wayland_cursor->scale;
return wl_cursor_image_get_buffer (image);
}
else if (wayland_cursor->name == NULL) /* From surface */
{
*hotspot_x =
wayland_cursor->surface.hotspot_x / wayland_cursor->surface.scale;
*hotspot_y =
wayland_cursor->surface.hotspot_y / wayland_cursor->surface.scale;
*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);
}
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;
}
void
_gdk_wayland_cursor_set_scale (GdkCursor *cursor,
guint scale)
{
GdkWaylandDisplay *wayland_display =
GDK_WAYLAND_DISPLAY (gdk_cursor_get_display (cursor));
GdkWaylandCursor *wayland_cursor = GDK_WAYLAND_CURSOR (cursor);
if (scale > GDK_WAYLAND_MAX_THEME_SCALE)
{
g_warning (G_STRLOC ": cursor theme size %u too large", scale);
scale = GDK_WAYLAND_MAX_THEME_SCALE;
}
if (wayland_cursor->scale == scale)
return;
wayland_cursor->scale = scale;
_gdk_wayland_cursor_update (wayland_display, wayland_cursor);
}
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)
{
}
static GdkCursor *
_gdk_wayland_display_get_cursor_for_name_with_scale (GdkDisplay *display,
const gchar *name,
guint scale)
{
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->scale = scale;
/* Blank cursor case */
if (!name || g_str_equal (name, "none") || g_str_equal (name, "blank_cursor"))
return GDK_CURSOR (private);
if (!_gdk_wayland_cursor_update (wayland_display, private))
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_name (GdkDisplay *display,
const gchar *name)
{
return _gdk_wayland_display_get_cursor_for_name_with_scale (display, name, 1);
}
GdkCursor *
_gdk_wayland_display_get_cursor_for_type_with_scale (GdkDisplay *display,
GdkCursorType cursor_type,
guint scale)
{
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_with_scale (display,
cursor_name,
scale);
g_free (cursor_name);
return result;
}
GdkCursor *
_gdk_wayland_display_get_cursor_for_type (GdkDisplay *display,
GdkCursorType cursor_type)
{
return _gdk_wayland_display_get_cursor_for_type_with_scale (display,
cursor_type,
1);
}
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)
{
double sx, sy;
cairo_surface_get_device_scale (surface, &sx, &sy);
cursor->surface.scale = (int)sx;
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;
}
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