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Diffstat (limited to 'libs/canvas/text.cc')
| -rw-r--r-- | libs/canvas/text.cc | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/libs/canvas/text.cc b/libs/canvas/text.cc new file mode 100644 index 0000000000..438413080a --- /dev/null +++ b/libs/canvas/text.cc @@ -0,0 +1,211 @@ +/* + 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/stacktrace.h" + +#include "canvas/text.h" +#include "canvas/canvas.h" +#include "canvas/utils.h" + +using namespace std; +using namespace ArdourCanvas; + +Text::Text (Group* parent) + : Item (parent) + , _color (0x000000ff) + , _font_description (0) + , _alignment (Pango::ALIGN_LEFT) + , _width (0) + , _height (0) + , _need_redraw (false) + , _clamped_width (COORD_MAX) +{ + +} + +Text::~Text () +{ + delete _font_description; +} + +void +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 +{ + if (_text.empty()) { + return; + } + + Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context); + + _redraw (layout); +} + +void +Text::redraw (Glib::RefPtr<Pango::Context> context) const +{ + if (_text.empty()) { + return; + } + + Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context); + _redraw (layout); +} + +void +Text::_redraw (Glib::RefPtr<Pango::Layout> layout) const +{ + layout->set_text (_text); + + if (_font_description) { + layout->set_font_description (*_font_description); + } + + layout->set_alignment (_alignment); + + int w; + int h; + + layout->get_size (w, h); + + _width = w / Pango::SCALE; + _height = h / 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::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const +{ + if (_text.empty()) { + return; + } + + if (_need_redraw) { + redraw (context); + } + + 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 (); +} + +void +Text::clamp_width (double w) +{ + _clamped_width = w; +} + +void +Text::compute_bounding_box () const +{ + if (!_canvas || _text.empty()) { + _bounding_box = boost::optional<Rect> (); + _bounding_box_dirty = false; + return; + } + + if (_bounding_box_dirty) { + if (_need_redraw || !_image) { + Glib::RefPtr<Pango::Context> context = Glib::wrap (gdk_pango_context_get()); // context now owns C object and will free it + redraw (context); + } + _bounding_box = Rect (0, 0, min (_clamped_width, (double) _image->get_width()), _image->get_height()); + _bounding_box_dirty = false; + } +} + +void +Text::set_alignment (Pango::Alignment alignment) +{ + begin_change (); + + _alignment = alignment; + _need_redraw = true; + _bounding_box_dirty = true; + end_change (); +} + +void +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 (); +} + +void +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; +} |