[PATCH 4/5] compositor: implement new data_device.set_surface protocol

[Ander Conselvan de Oliveira]

---
 src/compositor.c |   60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/compositor.h |    1 +
 2 files changed, 61 insertions(+), 0 deletions(-)

diff --git a/src/compositor.c b/src/compositor.c
index a519893..e2d9b4e 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -772,6 +772,8 @@ weston_compositor_top(struct weston_compositor *compositor)
 		list = list->next;
 	if (list->next == &input_device->sprite->link)
 		list = list->next;
+	if (list->next == &input_device->drag_surface->link)
+		list = list->next;
 
 	return list;
 }
@@ -903,6 +905,9 @@ struct weston_frame_callback {
 };
 
 static void
+update_drag_surface(struct wl_input_device *input_device, int dx, int dy);
+
+static void
 weston_output_repaint(struct weston_output *output, int msecs)
 {
 	struct weston_compositor *ec = output->compositor;
@@ -923,6 +928,8 @@ weston_output_repaint(struct weston_output *output, int msecs)
 	pixman_region32_init(&opaque);
 	pixman_region32_init(&overlap);
 
+	update_drag_surface(ec->input_device, 0, 0);
+
 	wl_list_for_each(es, &ec->surface_list, link) {
 		weston_surface_update_transform(es);
 
@@ -1286,6 +1293,31 @@ idle_handler(void *data)
 	return 1;
 }
 
+static void
+update_drag_surface(struct wl_input_device *input_device, int dx, int dy)
+{
+	struct weston_input_device *device =
+		(struct weston_input_device *) input_device;
+	struct weston_surface *drag_surface = device->drag_surface;
+
+	weston_surface_damage_below(drag_surface);
+
+	if (device->input_device.drag_icon_x != 0 ||
+	    device->input_device.drag_icon_y != 0) {
+		drag_surface->geometry.x = device->input_device.x +
+			device->input_device.drag_icon_x;
+		drag_surface->geometry.y = device->input_device.y +
+			device->input_device.drag_icon_y;
+
+		device->input_device.drag_icon_x = 0;
+		device->input_device.drag_icon_y = 0;
+	}
+
+	drag_surface->geometry.x = drag_surface->geometry.x + dx;
+	drag_surface->geometry.y = drag_surface->geometry.y + dy;
+	drag_surface->geometry.dirty = 1;
+}
+
 WL_EXPORT void
 notify_motion(struct wl_input_device *device, uint32_t time, int x, int y)
 {
@@ -1330,6 +1362,8 @@ notify_motion(struct wl_input_device *device, uint32_t time, int x, int y)
 			y = max_y;
 	}
 
+	update_drag_surface(device, x - device->x, y - device->y);
+
 	device->x = x;
 	device->y = y;
 
@@ -1460,6 +1494,8 @@ notify_pointer_focus(struct wl_input_device *device,
 	struct weston_compositor *compositor = wd->compositor;
 
 	if (output) {
+		update_drag_surface(device, x - device->x, y - device->y);
+
 		device->x = x;
 		device->y = y;
 		compositor->focus = 1;
@@ -1717,6 +1753,26 @@ bind_input_device(struct wl_client *client,
 	resource->destroy = unbind_input_device;
 }
 
+static void
+input_create_drag_surface(struct weston_input_device *device)
+{
+	struct weston_surface *drag_surface;
+
+	drag_surface = weston_surface_create(device->compositor);
+	device->drag_surface = drag_surface;
+
+	drag_surface->surface.resource.destroy = NULL;
+	drag_surface->surface.resource.client = NULL;
+	drag_surface->surface.resource.object.interface =
+		&wl_surface_interface;
+	drag_surface->surface.resource.object.implementation =
+		(void (**)(void)) &surface_interface;
+	drag_surface->surface.resource.data = device->drag_surface;
+
+	wl_data_device_set_drag_surface(&device->input_device,
+					&drag_surface->surface);
+}
+
 WL_EXPORT void
 weston_input_device_init(struct weston_input_device *device,
 			 struct weston_compositor *ec)
@@ -1734,6 +1790,8 @@ weston_input_device_init(struct weston_input_device *device,
 	device->modifier_state = 0;
 	device->num_tp = 0;
 
+	input_create_drag_surface(device);
+
 	wl_list_insert(ec->input_device_list.prev, &device->link);
 }
 
@@ -1746,6 +1804,8 @@ weston_input_device_release(struct weston_input_device *device)
 	if (device->sprite)
 		destroy_surface(&device->sprite->surface.resource);
 
+	destroy_surface(&device->drag_surface->surface.resource);
+
 	wl_input_device_release(&device->input_device);
 }
 
diff --git a/src/compositor.h b/src/compositor.h
index 80b848d..c3f571f 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -83,6 +83,7 @@ struct weston_input_device {
 	struct wl_input_device input_device;
 	struct weston_compositor *compositor;
 	struct weston_surface *sprite;
+	struct weston_surface *drag_surface;
 	int32_t hotspot_x, hotspot_y;
 	struct wl_list link;
 	uint32_t modifier_state;
-- 
1.7.4.1