static void
update_autoscale(ViewHelper *self)
{
GdkRectangle viewport = self->widget_allocation;
GeglRectangle bbox = gegl_node_get_bounding_box(self->node);
model_rect_to_view_rect(self, &bbox);
if (!self->node || viewport.width < 0 || viewport.height < 0
|| bbox.width < 0 || bbox.height < 0)
return;
if (self->autoscale_policy == GEGL_GTK_VIEW_AUTOSCALE_WIDGET) {
/* Request widget size change */
/* XXX: Should we reset scale/x/y here? */
g_signal_emit(self, view_helper_signals[SIGNAL_SIZE_CHANGED],
0, &bbox, NULL);
} else if (self->autoscale_policy == GEGL_GTK_VIEW_AUTOSCALE_CONTENT) {
/* Calculate and set scaling factor to make the content fit inside */
float width_ratio = bbox.width / (float)viewport.width;
float height_ratio = bbox.height / (float)viewport.height;
float max_ratio = width_ratio >= height_ratio ? width_ratio : height_ratio;
float current_scale = view_helper_get_scale(self);
view_helper_set_scale(self, current_scale * (1.0 / max_ratio));
}
}
/**
* gegl_gtk_view_get_scale:
* @self: A #GeglGtkView
*
* Getter for the :scale property
*
* Returns:
**/
float
gegl_gtk_view_get_scale(GeglGtkView *self)
{
return view_helper_get_scale(GET_PRIVATE(self));
}