Merge branch 'master' into windows+cc

[ardour.git] / libs / canvas / text.cc

diff --git a/libs/canvas/text.cc b/libs/canvas/text.cc
index ee15b13ef6398e2ceb1ce4a40e0902046fc470ad..7143f2aca704257547c5a1fe06671af79405b7f9 100644 (file)
--- a/libs/canvas/text.cc
+++ b/libs/canvas/text.cc
@@ -1,7 +1,28 @@
+/*
+    Copyright (C) 2011-2013 Paul Davis
+    Author: Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    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
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <gdk/gdk.h>
+
 #include <cairomm/cairomm.h>
 #include <gtkmm/label.h>
 
-#include "pbd/xml++.h"
+#include "pbd/stacktrace.h"
 
 #include "canvas/text.h"
 #include "canvas/canvas.h"
@@ -18,6 +39,7 @@ Text::Text (Group* parent)
        , _width (0)
        , _height (0)
        , _need_redraw (false)
+       , _clamped_width (COORD_MAX)
 {
 
 }
@@ -43,6 +65,10 @@ Text::set (string const & text)
 void
 Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
 {
+       if (_text.empty()) {
+               return;
+       }
+
        Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
 
        layout->set_text (_text);
@@ -57,8 +83,9 @@ Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
        
        _origin.x = ink_rect.get_x() / Pango::SCALE;
        _origin.y = ink_rect.get_y() / Pango::SCALE;
-       _width = (ink_rect.get_width() + Pango::SCALE / 2) / Pango::SCALE;
-       _height = (ink_rect.get_height() + Pango::SCALE / 2) / Pango::SCALE;
+
+       _width = _origin.x + (ink_rect.get_width() / Pango::SCALE);
+       _height = _origin.y + (ink_rect.get_height() / Pango::SCALE);
        
        _image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width, _height);
 
@@ -67,6 +94,7 @@ Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
        /* and draw, in the appropriate color of course */
 
        set_source_rgba (img_context, _color);
+
        layout->show_in_cairo_context (img_context);
 
        /* text has now been rendered in _image and is ready for blit in
@@ -76,13 +104,6 @@ Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
        _need_redraw = false;
 }
 
-void
-Text::compute_bounding_box () const
-{
-       _bounding_box = Rect (_origin.x, _origin.y, _origin.x + _width, _origin.y + _height);
-       _bounding_box_dirty = false;
-}
-
 void
 Text::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
 {
@@ -93,28 +114,54 @@ Text::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) cons
        if (_need_redraw) {
                redraw (context);
        }
-
-       context->set_source (_image, 0, 0);
-       context->rectangle (0, 0, _width, _height);
+       
+       Rect self = item_to_window (Rect (0, 0, min (_clamped_width, _width), _height));
+       context->rectangle (self.x0, self.y0, self.width(), self.height());
+       context->set_source (_image, self.x0, self.y0);
        context->fill ();
 }
 
-XMLNode *
-Text::get_state () const
+void
+Text::clamp_width (double w)
 {
-       XMLNode* node = new XMLNode ("Text");
-#ifdef CANVAS_DEBUG
-       if (!name.empty ()) {
-               node->add_property ("name", name);
-       }
-#endif
-       return node;
+       _clamped_width = w;
 }
 
 void
-Text::set_state (XMLNode const * /*node*/)
+Text::compute_bounding_box () const
 {
-       /* XXX */
+       if (!_canvas || _text.empty()) {
+               _bounding_box = boost::optional<Rect> ();
+               _bounding_box_dirty = false;
+               return;
+       }
+
+       if (_bounding_box_dirty) {
+               if (!_image) {
+
+                       PangoContext* _pc = gdk_pango_context_get ();
+                       Glib::RefPtr<Pango::Context> context = Glib::wrap (_pc); // context now owns _pc and will free it
+                       Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
+                       
+                       layout->set_text (_text);
+                       if (_font_description) {
+                               layout->set_font_description (*_font_description);
+                       }
+                       layout->set_alignment (_alignment);
+                       Pango::Rectangle const r = layout->get_ink_extents ();
+                       
+                       _bounding_box = Rect (
+                               0, 0, 
+                               (r.get_x() + r.get_width()) / Pango::SCALE,
+                               (r.get_y() + r.get_height()) / Pango::SCALE
+                               );
+               } else {
+
+                       _bounding_box = Rect (0, 0, _image->get_width(), _image->get_height());
+               }
+
+               _bounding_box_dirty = false;
+       }
 }
 
 void
@@ -152,3 +199,13 @@ Text::set_color (Color color)
 }
 
                
+void
+Text::dump (ostream& o) const
+{
+       Item::dump (o);
+
+       o << _canvas->indent() << '\t' << " text = " << _text << endl
+         << _canvas->indent() << " color = " << _color;
+
+       o << endl;
+}