/**
* gwy_data_view_set_alpha_layer:
* @data_view: A #GwyDataView.
* @layer: A layer to be used as the alpha layer for @data_view.
*
* Plugs @layer to @data_view as the alpha layer.
*
* If another alpha layer is present, it's unplugged.
*
* The layer must not be a vector layer. It can be %NULL, meaning no alpha
* layer is to be used.
**/
void
gwy_data_view_set_alpha_layer(GwyDataView *data_view,
GwyPixmapLayer *layer)
{
g_return_if_fail(!layer || GWY_IS_PIXMAP_LAYER(layer));
gwy_data_view_set_layer(data_view, &data_view->alpha_layer,
GWY_DATA_VIEW_LAYER(layer));
gwy_data_view_update(data_view);
}
static void
gwy_pixmap_layer_finalize(GObject *object)
{
GwyPixmapLayer *layer;
gwy_debug("");
g_return_if_fail(GWY_IS_PIXMAP_LAYER(object));
layer = GWY_PIXMAP_LAYER(object);
gwy_object_unref(layer->pixbuf);
G_OBJECT_CLASS(parent_class)->finalize(object);
}
/**
* gwy_set_data_preview_size:
* @data_view: A data view used for module preview.
* @max_size: Maximum allowed @data_view size (width and height).
*
* Sets up data view zoom to not exceed specified size.
*
* Before calling this function, data keys have be set, data fields and layers
* have to be present and physically square mode set in the container.
* Sizing of both pixel-wise square and physically square displays is performed
* correctly.
*
* Since: 2.7
**/
void
gwy_set_data_preview_size(GwyDataView *data_view,
gint max_size)
{
GwyContainer *container;
GwyDataField *data_field;
GwyPixmapLayer *layer;
gdouble zoomval, scale, xreal, yreal;
gboolean realsquare;
gint xres, yres;
const gchar *prefix;
gchar *key;
g_return_if_fail(GWY_IS_DATA_VIEW(data_view));
g_return_if_fail(max_size >= 2);
container = gwy_data_view_get_data(data_view);
g_return_if_fail(GWY_IS_CONTAINER(container));
layer = gwy_data_view_get_base_layer(data_view);
g_return_if_fail(GWY_IS_PIXMAP_LAYER(layer));
prefix = gwy_pixmap_layer_get_data_key(layer);
g_return_if_fail(prefix);
data_field = gwy_container_get_object_by_name(container, prefix);
g_return_if_fail(GWY_IS_DATA_FIELD(data_field));
prefix = gwy_data_view_get_data_prefix(data_view);
g_return_if_fail(prefix);
key = g_strconcat(prefix, "/realsquare", NULL);
realsquare = FALSE;
gwy_container_gis_boolean_by_name(container, key, &realsquare);
g_free(key);
xres = gwy_data_field_get_xres(data_field);
yres = gwy_data_field_get_yres(data_field);
if (!realsquare)
zoomval = max_size/(gdouble)MAX(xres, yres);
else {
xreal = gwy_data_field_get_xreal(data_field);
yreal = gwy_data_field_get_yreal(data_field);
scale = MAX(xres/xreal, yres/yreal);
zoomval = max_size/(scale*MAX(xreal, yreal));
}
gwy_data_view_set_zoom(data_view, zoomval);
}
