compositor: Move device coordinate transform helper to compositor.c

This function transform input coordinates from output space to
compositor space and is useful for X input as well as touch screen input.

src/compositor-x11.c

@@ -1058,61 +1058,6 @@ x11_compositor_deliver_button_event(struct x11_compositor *c,
 			      WL_POINTER_BUTTON_STATE_RELEASED);
 }
 
-static void
-x11_output_transform_coordinate(struct x11_output *x11_output,
-						wl_fixed_t *x, wl_fixed_t *y)
-{
-	struct weston_output *output = &x11_output->base;
-	wl_fixed_t tx, ty;
-	wl_fixed_t width = wl_fixed_from_int(output->width * output->scale - 1);
-	wl_fixed_t height = wl_fixed_from_int(output->height * output->scale - 1);
-
-	switch(output->transform) {
-	case WL_OUTPUT_TRANSFORM_NORMAL:
-	default:
-		tx = *x;
-		ty = *y;
-		break;
-	case WL_OUTPUT_TRANSFORM_90:
-		tx = *y;
-		ty = height - *x;
-		break;
-	case WL_OUTPUT_TRANSFORM_180:
-		tx = width - *x;
-		ty = height - *y;
-		break;
-	case WL_OUTPUT_TRANSFORM_270:
-		tx = width - *y;
-		ty = *x;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED:
-		tx = width - *x;
-		ty = *y;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED_90:
-		tx = width - *y;
-		ty = height - *x;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED_180:
-		tx = *x;
-		ty = height - *y;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED_270:
-		tx = *y;
-		ty = *x;
-		break;
-	}
-
-	tx /= output->scale;
-	ty /= output->scale;
-
-	tx += wl_fixed_from_int(output->x);
-	ty += wl_fixed_from_int(output->y);
-
-	*x = tx;
-	*y = ty;
-}
-
 static void
 x11_compositor_deliver_motion_event(struct x11_compositor *c,
 					xcb_generic_event_t *event)
@@ -1125,9 +1070,9 @@ x11_compositor_deliver_motion_event(struct x11_compositor *c,
 	if (!c->has_xkb)
 		update_xkb_state_from_core(c, motion_notify->state);
 	output = x11_compositor_find_output(c, motion_notify->event);
-	x = wl_fixed_from_int(motion_notify->event_x);
-	y = wl_fixed_from_int(motion_notify->event_y);
-	x11_output_transform_coordinate(output, &x, &y);
+	weston_output_transform_coordinate(&output->base,
+					   motion_notify->event_x,
+					   motion_notify->event_y, &x, &y);
 
 	notify_motion(&c->core_seat, weston_compositor_get_time(),
 		      x - c->prev_x, y - c->prev_y);
@@ -1150,9 +1095,9 @@ x11_compositor_deliver_enter_event(struct x11_compositor *c,
 	if (!c->has_xkb)
 		update_xkb_state_from_core(c, enter_notify->state);
 	output = x11_compositor_find_output(c, enter_notify->event);
-	x = wl_fixed_from_int(enter_notify->event_x);
-	y = wl_fixed_from_int(enter_notify->event_y);
-	x11_output_transform_coordinate(output, &x, &y);
+	weston_output_transform_coordinate(&output->base,
+					   enter_notify->event_x,
+					   enter_notify->event_y, &x, &y);
 
 	notify_pointer_focus(&c->core_seat, &output->base, x, y);
 

src/compositor.c

@@ -2751,6 +2751,57 @@ weston_output_init(struct weston_output *output, struct weston_compositor *c,
 	wl_signal_emit(&c->output_created_signal, output);
 }
 
+WL_EXPORT void
+weston_output_transform_coordinate(struct weston_output *output,
+				   int device_x, int device_y,
+				   wl_fixed_t *x, wl_fixed_t *y)
+{
+	wl_fixed_t tx, ty;
+	wl_fixed_t width, height;
+
+	width = wl_fixed_from_int(output->width * output->scale - 1);
+	height = wl_fixed_from_int(output->height * output->scale - 1);
+
+	switch(output->transform) {
+	case WL_OUTPUT_TRANSFORM_NORMAL:
+	default:
+		tx = wl_fixed_from_int(device_x);
+		ty = wl_fixed_from_int(device_y);
+		break;
+	case WL_OUTPUT_TRANSFORM_90:
+		tx = wl_fixed_from_int(device_y);
+		ty = height - wl_fixed_from_int(device_x);
+		break;
+	case WL_OUTPUT_TRANSFORM_180:
+		tx = width - wl_fixed_from_int(device_x);
+		ty = height - wl_fixed_from_int(device_y);
+		break;
+	case WL_OUTPUT_TRANSFORM_270:
+		tx = width - wl_fixed_from_int(device_y);
+		ty = wl_fixed_from_int(device_x);
+		break;
+	case WL_OUTPUT_TRANSFORM_FLIPPED:
+		tx = width - wl_fixed_from_int(device_x);
+		ty = wl_fixed_from_int(device_y);
+		break;
+	case WL_OUTPUT_TRANSFORM_FLIPPED_90:
+		tx = width - wl_fixed_from_int(device_y);
+		ty = height - wl_fixed_from_int(device_x);
+		break;
+	case WL_OUTPUT_TRANSFORM_FLIPPED_180:
+		tx = wl_fixed_from_int(device_x);
+		ty = height - wl_fixed_from_int(device_y);
+		break;
+	case WL_OUTPUT_TRANSFORM_FLIPPED_270:
+		tx = wl_fixed_from_int(device_y);
+		ty = wl_fixed_from_int(device_x);
+		break;
+	}
+
+	*x = tx / output->scale + wl_fixed_from_int(output->x);
+	*y = ty / output->scale + wl_fixed_from_int(output->y);
+}
+
 static void
 compositor_bind(struct wl_client *client,
 		void *data, uint32_t version, uint32_t id)

src/compositor.h

@@ -1075,6 +1075,10 @@ weston_output_init(struct weston_output *output, struct weston_compositor *c,
 		   int x, int y, int width, int height, uint32_t transform, int32_t scale);
 void
 weston_output_destroy(struct weston_output *output);
+void
+weston_output_transform_coordinate(struct weston_output *x11_output,
+				   int device_x, int device_y,
+				   wl_fixed_t *x, wl_fixed_t *y);
 
 void
 weston_seat_init(struct weston_seat *seat, struct weston_compositor *ec,