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/*
* java-gnome, a UI library for writing GTK and GNOME programs from Java!
*
* Copyright © 2007-2010 Operational Dynamics Consulting, Pty Ltd
* Copyright © 2008 Vreixo Formoso
*
* The code in this file, and the program it is a part of, is made available
* to you by its authors as open source software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License version
* 2 ("GPL") as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GPL for more details.
*
* You should have received a copy of the GPL along with this program. If not,
* see http://www.gnu.org/licenses/. The authors of this program may be
* contacted through http://java-gnome.sourceforge.net/.
*/
package org.gnome.pango;
import org.freedesktop.cairo.Context;
import org.freedesktop.cairo.Format;
import org.freedesktop.cairo.ImageSurface;
import org.freedesktop.cairo.Surface;
import org.gnome.gdk.Event;
import org.gnome.gdk.EventExpose;
import org.gnome.gdk.EventFocus;
import org.gnome.gtk.Gtk;
import org.gnome.gtk.Image;
import org.gnome.gtk.GraphicalTestCase;
import org.gnome.gtk.Widget;
import org.gnome.gtk.Window;
/**
* Evaluate problems relating to memory management of Pango Attribute structs.
*
* @author Vreixo Formoso
* @author Andrew Cowie
*/
public class ValidatePangoAttributeUsage extends GraphicalTestCase
{
private static Layout draw(Context cr) {
final Layout layout;
FontDescription desc;
final AttributeList list;
Attribute attr;
/*
* ...that we use to create a Pango Layout. The Context represents the
* backend where the text will be actually drawn. The Layout
* represents the text and its format attributes.
*/
layout = new Layout(cr);
/*
* You can set the default font description.
*/
desc = new FontDescription("DejaVu Serif, 18");
layout.setFontDescription(desc);
/*
* Build up the text and its formatting
*/
list = new AttributeList();
layout.setText("H€lloworldPeace武道");
attr = new StyleAttribute(Style.ITALIC);
attr.setIndices(0, 5);
list.insert(attr);
desc = new FontDescription();
desc.setWeight(Weight.BOLD);
attr = new FontDescriptionAttribute(desc);
attr.setIndices(5, 10);
list.insert(attr);
attr = new ForegroundColorAttribute(0.9, 0.1, 0.2);
attr.setIndices(10, 5);
list.insert(attr);
attr = new StyleAttribute(Style.NORMAL);
attr.setIndices(10, 5);
list.insert(attr);
attr = new BackgroundColorAttribute(1.0, 1.0, 0.0);
attr.setIndices(10, 5);
list.insert(attr);
attr = new WeightAttribute(Weight.NORMAL);
attr.setIndices(11, 4);
list.insert(attr);
attr = new VariantAttribute(Variant.SMALL_CAPS);
attr.setIndices(11, 4);
list.insert(attr);
attr = new ForegroundColorAttribute(0.0, 0.0, 0.0);
attr.setIndices(15, 2);
list.insert(attr);
attr = new FallbackAttribute(false);
attr.setIndices(15, 2);
list.insert(attr);
attr = new ForegroundColorAttribute(0.1, 0.5, 0.7);
list.insert(attr);
layout.setAttributes(list);
/*
* You can set the alignment of the Layout. Note that you should set
* its width too.
*/
layout.setWidth(290.0);
layout.setAlignment(Alignment.CENTER);
/*
* And finally, we draw the text!
*/
cr.showLayout(layout);
return layout;
}
public static void main(String[] args) {
final Window w;
final Image i;
Gtk.init(args);
w = new Window();
w.setDefaultSize(300, 70);
i = new Image();
w.add(i);
w.showAll();
i.connect(new Widget.ExposeEvent() {
public boolean onExposeEvent(Widget source, EventExpose event) {
final Context cr;
/*
* We need a Cairo context...
*/
cr = new Context(source.getWindow());
draw(cr);
return false;
}
});
/*
* This allows us to test the memory management problem where we were
* crashing the VM due to our not being aware that AttributeList's
* insert() steals the ownership of an Attribute.
*/
w.connect(new Widget.FocusOutEvent() {
public boolean onFocusOutEvent(Widget source, EventFocus event) {
System.gc();
return false;
}
});
w.connect(new Window.DeleteEvent() {
public boolean onDeleteEvent(Widget source, Event event) {
Gtk.mainQuit();
return false;
}
});
Gtk.main();
}
public final void testPangoAttributeOwnership() throws InterruptedException {
final Surface surface;
final Context cr;
Layout layout;
System.gc();
Thread.sleep(50);
surface = new ImageSurface(Format.ARGB32, 150, 150);
cr = new Context(surface);
layout = draw(cr);
assertNotNull(PangoLayout.getAttributes(layout));
layout = null;
System.gc();
Thread.sleep(50);
}
}
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