merge with master

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

diff --git a/libs/canvas/text.cc b/libs/canvas/text.cc
index feb88e199649c7ad9edb44dd4b2b54ad4a07f0fe..c0bac2f7ee08403582fafcab8eb21286bbfd8e60 100644 (file)
--- a/libs/canvas/text.cc
+++ b/libs/canvas/text.cc
@@ -1,5 +1,29 @@
+/*
+    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"
 #include "canvas/utils.h"
@@ -9,9 +33,13 @@ using namespace ArdourCanvas;
 
 Text::Text (Group* parent)
        : Item (parent)
-       , _font_description (0)
        , _color (0x000000ff)
+       , _font_description (0)
        , _alignment (Pango::ALIGN_LEFT)
+       , _width (0)
+       , _height (0)
+       , _need_redraw (false)
+       , _clamped_width (COORD_MAX)
 {
 
 }
@@ -27,21 +55,75 @@ Text::set (string const & text)
        begin_change ();
        
        _text = text;
-       
+
+       _need_redraw = true;
        _bounding_box_dirty = true;
+
        end_change ();
 }
 
+void
+Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
+{
+       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 ink_rect = layout->get_ink_extents();
+       
+       _origin.x = ink_rect.get_x() / Pango::SCALE;
+       _origin.y = ink_rect.get_y() / 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);
+
+       Cairo::RefPtr<Cairo::Context> img_context = Cairo::Context::create (_image);
+
+       /* 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
+        * ::render 
+        */
+
+       _need_redraw = false;
+}
+
+void
+Text::clamp_width (double w)
+{
+       _clamped_width = w;
+}
+
 void
 Text::compute_bounding_box () const
 {
-       if (!_canvas || !_canvas->context ()) {
+       if (!_canvas || _text.empty()) {
                _bounding_box = boost::optional<Rect> ();
                _bounding_box_dirty = false;
                return;
        }
+
+       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);
        
-       Pango::Rectangle const r = layout (_canvas->context())->get_ink_extents ();
+       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 (
                r.get_x() / Pango::SCALE,
@@ -49,45 +131,24 @@ Text::compute_bounding_box () const
                (r.get_x() + r.get_width()) / Pango::SCALE,
                (r.get_y() + r.get_height()) / Pango::SCALE
                );
-       
+               
        _bounding_box_dirty = false;
 }
 
-Glib::RefPtr<Pango::Layout>
-Text::layout (Cairo::RefPtr<Cairo::Context> context) const
-{
-       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);
-       return layout;
-}
-
 void
 Text::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
 {
-       set_source_rgba (context, _color);
-       layout (context)->show_in_cairo_context (context);
-}
-
-XMLNode *
-Text::get_state () const
-{
-       XMLNode* node = new XMLNode ("Text");
-#ifdef CANVAS_DEBUG
-       if (!name.empty ()) {
-               node->add_property ("name", name);
+       if (_text.empty()) {
+               return;
        }
-#endif
-       return node;
-}
 
-void
-Text::set_state (XMLNode const * /*node*/)
-{
-       /* XXX */
+       if (_need_redraw) {
+               redraw (context);
+       }
+       
+       context->set_source (_image, 0, 0);
+       context->rectangle (0, 0, min (_clamped_width, _width), _height);
+       context->fill ();
 }
 
 void
@@ -96,7 +157,7 @@ Text::set_alignment (Pango::Alignment alignment)
        begin_change ();
        
        _alignment = alignment;
-
+       _need_redraw = true;
        _bounding_box_dirty = true;
        end_change ();
 }
@@ -107,6 +168,7 @@ Text::set_font_description (Pango::FontDescription font_description)
        begin_change ();
        
        _font_description = new Pango::FontDescription (font_description);
+       _need_redraw = true;
 
        _bounding_box_dirty = true;
        end_change ();
@@ -118,8 +180,19 @@ Text::set_color (Color color)
        begin_change ();
 
        _color = color;
+       _need_redraw = true;
 
        end_change ();
 }
 
                
+void
+Text::dump (ostream& o) const
+{
+       Item::dump (o);
+
+       o << _canvas->indent() << '\t' << " text = " << _text << endl
+         << _canvas->indent() << " color = " << _color;
+
+       o << endl;
+}