2013-04-15 22:10:18 -04:00
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/*
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Copyright (C) 2011-2013 Paul Davis
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Author: Carl Hetherington <cth@carlh.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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2013-04-09 14:22:58 -04:00
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#include <gdk/gdk.h>
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2013-04-06 18:35:32 -04:00
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#include <cairomm/cairomm.h>
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#include <gtkmm/label.h>
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2013-04-09 14:22:58 -04:00
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#include "pbd/stacktrace.h"
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2013-04-04 00:32:52 -04:00
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#include "canvas/text.h"
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#include "canvas/canvas.h"
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#include "canvas/utils.h"
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using namespace std;
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using namespace ArdourCanvas;
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2014-06-12 14:53:44 -04:00
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Text::Text (Canvas* c)
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: Item (c)
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, _color (0x000000ff)
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, _font_description (0)
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, _alignment (Pango::ALIGN_LEFT)
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, _width (0)
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, _height (0)
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, _need_redraw (false)
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, _clamped_width (COORD_MAX)
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{
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_outline = false;
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}
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Text::Text (Item* parent)
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: Item (parent)
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, _color (0x000000ff)
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, _font_description (0)
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, _alignment (Pango::ALIGN_LEFT)
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, _width (0)
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, _height (0)
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, _need_redraw (false)
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, _clamped_width (COORD_MAX)
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{
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_outline = false;
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}
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Text::~Text ()
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{
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delete _font_description;
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}
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void
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Text::set (string const & text)
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{
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begin_change ();
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_text = text;
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_need_redraw = true;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
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{
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if (_text.empty()) {
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return;
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}
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Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
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_redraw (layout);
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}
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void
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Text::redraw (Glib::RefPtr<Pango::Context> context) const
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{
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if (_text.empty()) {
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return;
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}
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Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
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_redraw (layout);
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}
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void
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Text::_redraw (Glib::RefPtr<Pango::Layout> layout) const
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{
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layout->set_text (_text);
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if (_font_description) {
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layout->set_font_description (*_font_description);
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}
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layout->set_alignment (_alignment);
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int w;
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int h;
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layout->get_pixel_size (w, h);
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_width = w;
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_height = h;
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_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width, _height);
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Cairo::RefPtr<Cairo::Context> img_context = Cairo::Context::create (_image);
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/* and draw, in the appropriate color of course */
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if (_outline) {
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set_source_rgba (img_context, _outline_color);
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layout->update_from_cairo_context (img_context);
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pango_cairo_layout_path (img_context->cobj(), layout->gobj());
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img_context->stroke_preserve ();
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set_source_rgba (img_context, _color);
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img_context->fill ();
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} else {
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set_source_rgba (img_context, _color);
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layout->show_in_cairo_context (img_context);
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}
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/* text has now been rendered in _image and is ready for blit in
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* ::render
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*/
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_need_redraw = false;
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}
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void
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Text::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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if (_text.empty()) {
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return;
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}
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Rect self = item_to_window (Rect (0, 0, min (_clamped_width, (double)_image->get_width ()), _image->get_height ()));
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boost::optional<Rect> i = self.intersection (area);
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if (!i) {
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return;
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}
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2013-06-18 13:46:24 -04:00
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if (_need_redraw) {
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redraw (context);
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}
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Rect intersection (i.get());
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context->rectangle (intersection.x0, intersection.y0, intersection.width(), intersection.height());
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context->set_source (_image, self.x0, self.y0);
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context->fill ();
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}
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2013-04-15 14:45:22 -04:00
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void
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Text::clamp_width (double w)
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{
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begin_change ();
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_clamped_width = w;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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Text::compute_bounding_box () const
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{
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if (!_canvas || _text.empty()) {
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_bounding_box = boost::optional<Rect> ();
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_bounding_box_dirty = false;
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return;
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}
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2013-06-26 17:55:42 -04:00
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if (_bounding_box_dirty) {
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if (_need_redraw || !_image) {
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Glib::RefPtr<Pango::Context> context = Glib::wrap (gdk_pango_context_get()); // context now owns C object and will free it
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redraw (context);
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}
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_bounding_box = Rect (0, 0, min (_clamped_width, (double) _image->get_width()), _image->get_height());
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_bounding_box_dirty = false;
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}
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}
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void
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Text::set_alignment (Pango::Alignment alignment)
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{
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begin_change ();
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_alignment = alignment;
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_need_redraw = true;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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Text::set_font_description (Pango::FontDescription font_description)
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{
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begin_change ();
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_font_description = new Pango::FontDescription (font_description);
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_need_redraw = true;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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Text::set_color (Color color)
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{
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begin_change ();
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_color = color;
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2014-06-30 10:39:26 -04:00
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if (_outline) {
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set_outline_color (contrasting_text_color (_color));
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}
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_need_redraw = true;
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2013-04-04 00:32:52 -04:00
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end_change ();
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}
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2013-04-08 19:48:09 -04:00
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void
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Text::dump (ostream& o) const
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{
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Item::dump (o);
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o << _canvas->indent() << '\t' << " text = " << _text << endl
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<< _canvas->indent() << " color = " << _color;
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o << endl;
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}
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