2 Copyright (C) 2011-2013 Paul Davis
3 Author: Carl Hetherington <cth@carlh.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <cairomm/cairomm.h>
23 #include <gtkmm/label.h>
25 #include "pbd/stacktrace.h"
27 #include "canvas/text.h"
28 #include "canvas/canvas.h"
29 #include "canvas/utils.h"
32 using namespace ArdourCanvas;
34 Text::Text (Canvas* c)
37 , _font_description (0)
38 , _alignment (Pango::ALIGN_LEFT)
41 , _need_redraw (false)
42 , _clamped_width (COORD_MAX)
47 Text::Text (Item* parent)
50 , _font_description (0)
51 , _alignment (Pango::ALIGN_LEFT)
54 , _need_redraw (false)
55 , _clamped_width (COORD_MAX)
62 delete _font_description;
66 Text::set (string const & text)
73 _bounding_box_dirty = true;
79 Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
85 Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
91 Text::redraw (Glib::RefPtr<Pango::Context> context) const
97 Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
102 Text::_redraw (Glib::RefPtr<Pango::Layout> layout) const
104 layout->set_text (_text);
106 if (_font_description) {
107 layout->set_font_description (*_font_description);
110 layout->set_alignment (_alignment);
115 layout->get_pixel_size (w, h);
120 _image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width, _height);
122 Cairo::RefPtr<Cairo::Context> img_context = Cairo::Context::create (_image);
124 /* and draw, in the appropriate color of course */
127 set_source_rgba (img_context, _outline_color);
128 layout->update_from_cairo_context (img_context);
129 pango_cairo_layout_path (img_context->cobj(), layout->gobj());
130 img_context->stroke_preserve ();
131 set_source_rgba (img_context, _color);
132 img_context->fill ();
134 set_source_rgba (img_context, _color);
135 layout->show_in_cairo_context (img_context);
138 /* text has now been rendered in _image and is ready for blit in
142 _need_redraw = false;
146 Text::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
152 Rect self = item_to_window (Rect (0, 0, min (_clamped_width, (double)_image->get_width ()), _image->get_height ()));
153 boost::optional<Rect> i = self.intersection (area);
163 Rect intersection (i.get());
165 context->rectangle (intersection.x0, intersection.y0, intersection.width(), intersection.height());
166 context->set_source (_image, self.x0, self.y0);
171 Text::clamp_width (double w)
175 _bounding_box_dirty = true;
180 Text::compute_bounding_box () const
182 if (!_canvas || _text.empty()) {
183 _bounding_box = boost::optional<Rect> ();
184 _bounding_box_dirty = false;
188 if (_bounding_box_dirty) {
189 if (_need_redraw || !_image) {
190 Glib::RefPtr<Pango::Context> context = Glib::wrap (gdk_pango_context_get()); // context now owns C object and will free it
193 _bounding_box = Rect (0, 0, min (_clamped_width, (double) _image->get_width()), _image->get_height());
194 _bounding_box_dirty = false;
199 Text::set_alignment (Pango::Alignment alignment)
203 _alignment = alignment;
205 _bounding_box_dirty = true;
210 Text::set_font_description (Pango::FontDescription font_description)
214 _font_description = new Pango::FontDescription (font_description);
217 _bounding_box_dirty = true;
222 Text::set_color (Color color)
228 set_outline_color (contrasting_text_color (_color));
237 Text::dump (ostream& o) const
241 o << _canvas->indent() << '\t' << " text = " << _text << endl
242 << _canvas->indent() << " color = " << _color;