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wayland: Implement DND icon hotspot API

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In Wayland, the hotspot of a DND icon is set using the buffer offset in
wl_buffer.attach. To implement this, add a private API to cause the
next wl_surface.attach to offset the new buffer with a given offset.
Setting a DND icon hotspot sets this offset while also queuing a redraw
of the window to trigger the wl_surface.attach.

https://bugzilla.gnome.org/show_bug.cgi?id=759168
This commit is contained in:
Jonas Ådahl
2015-12-08 18:19:33 +08:00
committed by Matthias Clasen
parent 0164256aec
commit 3ab9d96623
3 changed files with 60 additions and 3 deletions
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33
gdk/wayland/gdkwindow-wayland.c
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@ -121,6 +121,8 @@ struct _GdkWindowImplWayland
GdkWindow *transient_for;
cairo_surface_t *cairo_surface;
int pending_buffer_offset_x;
int pending_buffer_offset_y;
gchar *title;
@ -564,7 +566,10 @@ gdk_wayland_window_attach_image (GdkWindow *window)
/* Attach this new buffer to the surface */
wl_surface_attach (impl->surface,
_gdk_wayland_shm_surface_get_wl_buffer (impl->cairo_surface),
0, 0);
impl->pending_buffer_offset_x,
impl->pending_buffer_offset_y);
impl->pending_buffer_offset_x = 0;
impl->pending_buffer_offset_y = 0;
/* Only set the buffer scale if supported by the compositor */
display = GDK_WAYLAND_DISPLAY (gdk_window_get_display (window));
@ -2564,6 +2569,32 @@ gdk_wayland_window_get_wl_surface (GdkWindow *window)
return GDK_WINDOW_IMPL_WAYLAND (window->impl)->surface;
}
/**
* gdk_wayland_window_offset_next_wl_buffer:
* @window (type GdkWaylandWindow): a #GdkWindow
* @x: x offset which the next buffer should be attached at
* @y: y offset which the next buffer should be attached at
*
* Make GDK attach the next buffer at the given offset. This is useful for
* DND icons which may have a hotspot other than (0, 0).
*
* Since: 3.20
*/
void
gdk_wayland_window_offset_next_wl_buffer (GdkWindow *window,
int x,
int y)
{
GdkWindowImplWayland *impl;
g_return_if_fail (GDK_IS_WAYLAND_WINDOW (window));
impl = GDK_WINDOW_IMPL_WAYLAND (window->impl);
impl->pending_buffer_offset_x = x;
impl->pending_buffer_offset_y = y;
}
static struct wl_egl_window *
gdk_wayland_window_get_wl_egl_window (GdkWindow *window)
{