Animate transitions for zoom focus point change.

Handle the transition when focus changes from text cursor to
mouse pointer or vice versa.

src/compositor.c

@@ -1633,7 +1633,7 @@ notify_motion(struct wl_seat *seat, uint32_t time, wl_fixed_t x, wl_fixed_t y)
 		if (output->zoom.active &&
 		    pixman_region32_contains_point(&output->region,
 						   ix, iy, NULL))
-			weston_output_update_zoom(output, x, y, ZOOM_FOCUS_POINTER);
+			weston_output_update_zoom(output, ZOOM_FOCUS_POINTER);
 
 	weston_device_repick(seat);
 	interface = seat->pointer->grab->interface;
@@ -2783,9 +2783,11 @@ weston_text_cursor_position_notify(struct weston_surface *surface,
 		    pixman_region32_contains_point(&output->region,
 						wl_fixed_to_int(global_x),
 						wl_fixed_to_int(global_y),
-						NULL))
+						NULL)) {
-			weston_output_update_zoom(output, global_x, global_y,
+			output->zoom.text_cursor.x = global_x;
-							  ZOOM_FOCUS_TEXT);
+			output->zoom.text_cursor.y = global_y;
+			weston_output_update_zoom(output, ZOOM_FOCUS_TEXT);
+		}
 }
 
 static void
@@ -2815,60 +2817,89 @@ weston_zoom_frame_z(struct weston_animation *animation,
 }
 
 static void
-weston_zoom_transition(struct weston_output *output)
+weston_zoom_frame_xy(struct weston_animation *animation,
+		struct weston_output *output, uint32_t msecs)
 {
-	if (output->zoom.level != output->zoom.spring_z.current) {
+	wl_fixed_t x, y;
-		output->zoom.spring_z.target = output->zoom.level;
+	if (animation->frame_counter <= 1)
-		if (wl_list_empty(&output->zoom.animation_z.link)) {
+		output->zoom.spring_xy.timestamp = msecs;
-			output->zoom.animation_z.frame_counter = 0;
+
-			wl_list_insert(output->animation_list.prev,
+	weston_spring_update(&output->zoom.spring_xy, msecs);
-				&output->zoom.animation_z.link);
+
-		}
+	x = output->zoom.from.x - ((output->zoom.from.x - output->zoom.to.x) *
+						output->zoom.spring_xy.current);
+	y = output->zoom.from.y - ((output->zoom.from.y - output->zoom.to.y) *
+						output->zoom.spring_xy.current);
+
+	output->zoom.current.x = x;
+	output->zoom.current.y = y;
+
+	if (weston_spring_done(&output->zoom.spring_xy)) {
+		output->zoom.spring_xy.current = output->zoom.spring_xy.target;
+		output->zoom.current.x =
+				(output->zoom.type == ZOOM_FOCUS_POINTER) ?
+					output->compositor->seat->pointer.x :
+					output->zoom.text_cursor.x;
+		output->zoom.current.y =
+				(output->zoom.type == ZOOM_FOCUS_POINTER) ?
+					output->compositor->seat->pointer.y :
+					output->zoom.text_cursor.y;
+		wl_list_remove(&animation->link);
+		wl_list_init(&animation->link);
 	}
 
 	output->dirty = 1;
 	weston_output_damage(output);
 }
 
-WL_EXPORT void
+static void
-weston_output_update_zoom(struct weston_output *output,
+zoom_area_center_from_pointer(struct weston_output *output,
-						wl_fixed_t x,
+				wl_fixed_t *x, wl_fixed_t *y)
-						wl_fixed_t y,
+{
-						uint32_t type)
+	float level = output->zoom.spring_z.current;
+	wl_fixed_t offset_x = wl_fixed_from_int(output->x);
+	wl_fixed_t offset_y = wl_fixed_from_int(output->y);
+	wl_fixed_t w = wl_fixed_from_int(output->current->width);
+	wl_fixed_t h = wl_fixed_from_int(output->current->height);
+
+	*x -= ((((*x - offset_x) / (float) w) - 0.5) * (w * (1.0 - level)));
+	*y -= ((((*y - offset_y) / (float) h) - 0.5) * (h * (1.0 - level)));
+}
+
+static void
+weston_output_update_zoom_transform(struct weston_output *output)
 {
+	uint32_t type = output->zoom.type;
 	float global_x, global_y;
+	wl_fixed_t x = output->zoom.current.x;
+	wl_fixed_t y = output->zoom.current.y;
 	float trans_min, trans_max;
 	float ratio, level;
 
 	level = output->zoom.spring_z.current;
+	ratio = 1 / level;
 
 	if (!output->zoom.active || level > output->zoom.max_level)
 		return;
 
-	output->zoom.type = type;
+	if (type == ZOOM_FOCUS_POINTER &&
-
+			wl_list_empty(&output->zoom.animation_xy.link))
-	output->zoom.fx = x;
+		zoom_area_center_from_pointer(output, &x, &y);
-	output->zoom.fy = y;
 
 	global_x = wl_fixed_to_double(x);
 	global_y = wl_fixed_to_double(y);
 
 	output->zoom.trans_x =
-		(((global_x - output->x) / output->current->width) *
+		((((global_x - output->x) / output->current->width) *
-		(level * 2)) - level;
+		(level * 2)) - level) * ratio;
 	output->zoom.trans_y =
-		(((global_y - output->y) / output->current->height) *
+		((((global_y - output->y) / output->current->height) *
-		(level * 2)) - level;
+		(level * 2)) - level) * ratio;
-
-	if (type == ZOOM_FOCUS_TEXT) {
-		ratio = 1 / level;
-
-		output->zoom.trans_x *= ratio;
-		output->zoom.trans_y *= ratio;
 
 	trans_max = level * 2 - level;
 	trans_min = -trans_max;
 
+	/* Clip zoom area to output */
 	if (output->zoom.trans_x > trans_max)
 		output->zoom.trans_x = trans_max;
 	else if (output->zoom.trans_x < trans_min)
@@ -2879,7 +2910,85 @@ weston_output_update_zoom(struct weston_output *output,
 		output->zoom.trans_y = trans_min;
 }
 
-	weston_zoom_transition(output);
+static void
+weston_zoom_transition(struct weston_output *output, uint32_t type,
+						wl_fixed_t x, wl_fixed_t y)
+{
+	if (output->zoom.type != type) {
+		/* Set from/to points and start animation */
+		output->zoom.spring_xy.current = 0.0;
+		output->zoom.spring_xy.previous = 0.0;
+		output->zoom.spring_xy.target = 1.0;
+
+		if (wl_list_empty(&output->zoom.animation_xy.link)) {
+			output->zoom.animation_xy.frame_counter = 0;
+			wl_list_insert(output->animation_list.prev,
+				&output->zoom.animation_xy.link);
+
+			output->zoom.from.x = (type == ZOOM_FOCUS_TEXT) ?
+						x : output->zoom.text_cursor.x;
+			output->zoom.from.y = (type == ZOOM_FOCUS_TEXT) ?
+						y : output->zoom.text_cursor.y;
+		} else {
+			output->zoom.from.x = output->zoom.current.x;
+			output->zoom.from.y = output->zoom.current.y;
+		}
+
+		output->zoom.to.x = (type == ZOOM_FOCUS_POINTER) ?
+						x : output->zoom.text_cursor.x;
+		output->zoom.to.y = (type == ZOOM_FOCUS_POINTER) ?
+						y : output->zoom.text_cursor.y;
+		output->zoom.current.x = output->zoom.from.x;
+		output->zoom.current.y = output->zoom.from.y;
+
+		output->zoom.type = type;
+	}
+
+	if (output->zoom.level != output->zoom.spring_z.current) {
+		output->zoom.spring_z.target = output->zoom.level;
+		if (wl_list_empty(&output->zoom.animation_z.link)) {
+			output->zoom.animation_z.frame_counter = 0;
+			wl_list_insert(output->animation_list.prev,
+				&output->zoom.animation_z.link);
+		}
+	}
+
+	output->dirty = 1;
+	weston_output_damage(output);
+}
+
+WL_EXPORT void
+weston_output_update_zoom(struct weston_output *output, uint32_t type)
+{
+	wl_fixed_t x = output->compositor->seat->pointer.x;
+	wl_fixed_t y = output->compositor->seat->pointer.y;
+
+	zoom_area_center_from_pointer(output, &x, &y);
+
+	if (type == ZOOM_FOCUS_POINTER) {
+		if (wl_list_empty(&output->zoom.animation_xy.link)) {
+			output->zoom.current.x =
+					output->compositor->seat->pointer.x;
+			output->zoom.current.y =
+					output->compositor->seat->pointer.y;
+		} else {
+			output->zoom.to.x = x;
+			output->zoom.to.y = y;
+		}
+	}
+
+	if (type == ZOOM_FOCUS_TEXT) {
+		if (wl_list_empty(&output->zoom.animation_xy.link)) {
+			output->zoom.current.x = output->zoom.text_cursor.x;
+			output->zoom.current.y = output->zoom.text_cursor.y;
+		} else {
+			output->zoom.to.x = output->zoom.text_cursor.x;
+			output->zoom.to.y = output->zoom.text_cursor.y;
+		}
+	}
+
+	weston_zoom_transition(output, type, x, y);
+	weston_output_update_zoom_transform(output);
 }
 
 WL_EXPORT void
@@ -2904,9 +3013,7 @@ weston_output_update_matrix(struct weston_output *output)
 		magnification = 1 / (1 - output->zoom.spring_z.current);
 		weston_matrix_init(&camera);
 		weston_matrix_init(&modelview);
-		weston_output_update_zoom(output, output->zoom.fx,
+		weston_output_update_zoom(output, output->zoom.type);
-						  output->zoom.fy,
-						  output->zoom.type);
 		weston_matrix_translate(&camera, output->zoom.trans_x,
 					  flip * output->zoom.trans_y, 0);
 		weston_matrix_invert(&modelview, &camera);
@@ -2951,10 +3058,15 @@ weston_output_init(struct weston_output *output, struct weston_compositor *c,
 	output->zoom.level = 0.0;
 	output->zoom.trans_x = 0.0;
 	output->zoom.trans_y = 0.0;
+	output->zoom.type = ZOOM_FOCUS_POINTER;
 	weston_spring_init(&output->zoom.spring_z, 250.0, 0.0, 0.0);
 	output->zoom.spring_z.friction = 1000;
 	output->zoom.animation_z.frame = weston_zoom_frame_z;
 	wl_list_init(&output->zoom.animation_z.link);
+	weston_spring_init(&output->zoom.spring_xy, 250.0, 0.0, 0.0);
+	output->zoom.spring_xy.friction = 1000;
+	output->zoom.animation_xy.frame = weston_zoom_frame_xy;
+	wl_list_init(&output->zoom.animation_xy.link);
 
 	output->flags = flags;
 	weston_output_move(output, x, y);

src/compositor.h

@@ -115,16 +115,25 @@ enum {
 	ZOOM_FOCUS_TEXT
 };
 
+struct weston_fixed_point {
+	wl_fixed_t x, y;
+};
+
 struct weston_output_zoom {
 	int active;
 	uint32_t type;
 	float increment;
 	float level;
 	float max_level;
-	wl_fixed_t fx, fy;
 	float trans_x, trans_y;
 	struct weston_animation animation_z;
 	struct weston_spring spring_z;
+	struct weston_animation animation_xy;
+	struct weston_spring spring_xy;
+	struct weston_fixed_point from;
+	struct weston_fixed_point to;
+	struct weston_fixed_point current;
+	struct weston_fixed_point text_cursor;
 };
 
 /* bit compatible with drm definitions. */
@@ -633,9 +642,7 @@ void
 weston_text_cursor_position_notify(struct weston_surface *surface,
 						wl_fixed_t x, wl_fixed_t y);
 void
-weston_output_update_zoom(struct weston_output *output,
+weston_output_update_zoom(struct weston_output *output, uint32_t type);
-						wl_fixed_t x, wl_fixed_t y,
-						uint32_t type);
 void
 weston_output_update_matrix(struct weston_output *output);
 void

src/shell.c

@@ -2185,10 +2185,7 @@ do_zoom(struct wl_seat *seat, uint32_t time, uint32_t key, uint32_t axis,
 
 			output->zoom.spring_z.target = output->zoom.level;
 
-			weston_output_update_zoom(output,
+			weston_output_update_zoom(output, output->zoom.type);
-			                          seat->pointer->x,
-						  seat->pointer->y,
-						  ZOOM_FOCUS_POINTER);
 		}
 	}
 }