The snapshot mask cannot draw all the content

[q962 (提及)]

static void _draw( LxLyricLine* self, GtkSnapshot* snapshot, int offset ){
	int width  = gtk_widget_get_width( ( gpointer )self );
	int height = gtk_widget_get_height( ( gpointer )self );
	// width      = gtk_widget_get_allocated_width( ( gpointer )self );
	// height     = gtk_widget_get_allocated_height( ( gpointer )self );

	GtkSnapshot* child_snapshot = NULL;

	GdkRGBA color;
	gdk_rgba_parse( &color, "yellow" );

	int height_half = height / 2;

	// if ( offset < width ) {
	gtk_snapshot_push_clip( snapshot, &GRAPHENE_RECT_INIT( offset, -height_half, width, height * 2 ) );
	child_snapshot = gtk_snapshot_new();
	lx_widget_snapshot_childs( ( gpointer )self, child_snapshot );
	gtk_snapshot_append_node( snapshot, gtk_snapshot_free_to_node( child_snapshot ) );
	gtk_snapshot_pop( snapshot );
	//}

	gtk_snapshot_push_mask( snapshot, GSK_MASK_MODE_ALPHA );
	child_snapshot = gtk_snapshot_new();
	lx_widget_snapshot_childs( ( gpointer )self, child_snapshot );
	gtk_snapshot_append_node( snapshot, gtk_snapshot_free_to_node( child_snapshot ) );
	gtk_snapshot_pop( snapshot );
	gtk_snapshot_append_color( snapshot, &color, &GRAPHENE_RECT_INIT( 0, -height_half, offset, height * 2 ) );
	gtk_snapshot_pop( snapshot );
}

/////////////////////////////////////

static void lx_lyric_line_snapshot( GtkWidget* widget, GtkSnapshot* _snapshot )
{
	_SELF( widget );

	int width = gtk_widget_get_width( widget );
	//width     = gtk_widget_get_allocated_width( widget );
	// int height = gtk_widget_get_height( widget );

	_draw( self, _snapshot, width );
	return;
}

offset = width, but part of the content on the right is lost

I tried gtk_widget_get_allocated_width, still no effect

[q962 (提及)]

Maybe there is a problem with my measure function measurement