/* * Copyright (C) 2012 Carl Hetherington * Copyright (C) 2013-2017 Paul Davis * Copyright (C) 2015-2017 Robin Gareus * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include "pbd/stacktrace.h" #include "canvas/text.h" #include "canvas/canvas.h" #include "gtkmm2ext/colors.h" using namespace std; using namespace ArdourCanvas; Text::Text (Canvas* c) : Item (c) , _color (0x000000ff) , _font_description (0) , _alignment (Pango::ALIGN_LEFT) , _width (0) , _height (0) , _need_redraw (false) , _width_correction (-1) , _clamped_width (COORD_MAX) { _outline = false; } Text::Text (Item* parent) : Item (parent) , _color (0x000000ff) , _font_description (0) , _alignment (Pango::ALIGN_LEFT) , _width (0) , _height (0) , _need_redraw (false) , _width_correction (-1) , _clamped_width (COORD_MAX) { _outline = false; } Text::~Text () { delete _font_description; } void Text::set (string const & text) { if (text == _text) { return; } begin_change (); _text = text; _need_redraw = true; _bounding_box_dirty = true; end_change (); } double Text::width () const { if (_need_redraw) { _redraw (); } return _width; } double Text::height () const { if (_need_redraw) { _redraw (); } return _height; } void Text::_redraw () const { assert (!_text.empty()); assert (_canvas); Glib::RefPtr context = _canvas->get_pango_context(); Glib::RefPtr layout = Pango::Layout::create (context); #if 0 // def __APPLE__ // Looks like this is no longer needed 2017-03-11, pango 1.36.8, pangomm 2.34.0 if (_width_correction < 0.0) { // Pango returns incorrect text width on some OS X // So we have to make a correction // To determine the correct indent take the largest symbol for which the width is correct // and make the calculation Gtk::Window win; Gtk::Label foo; win.add (foo); win.ensure_style (); int width = 0; int height = 0; Glib::RefPtr test_layout = foo.create_pango_layout ("H"); if (_font_description) { test_layout->set_font_description (*_font_description); } test_layout->get_pixel_size (width, height); _width_correction = width*1.5; } #else /* don't bother with a conditional here */ _width_correction = 0.0; #endif layout->set_text (_text); if (_font_description) { layout->set_font_description (*_font_description); } layout->set_alignment (_alignment); int w; int h; layout->get_pixel_size (w, h); _width = w + _width_correction; _height = h; #ifdef __APPLE__ _image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width * 2, _height * 2); #else _image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width, _height); #endif Cairo::RefPtr img_context = Cairo::Context::create (_image); #ifdef __APPLE__ /* Below, the rendering scaling is set to support retina display */ img_context->scale (2, 2); #endif /* and draw, in the appropriate color of course */ if (_outline) { Gtkmm2ext::set_source_rgba (img_context, _outline_color); layout->update_from_cairo_context (img_context); pango_cairo_layout_path (img_context->cobj(), layout->gobj()); img_context->stroke_preserve (); Gtkmm2ext::set_source_rgba (img_context, _color); img_context->fill (); } else { Gtkmm2ext::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 context) const { if (_text.empty()) { return; } Rect self = item_to_window (Rect (0, 0, min (_clamped_width, (double)_image->get_width ()), _image->get_height ())); Rect i = self.intersection (area); if (!i) { return; } if (_need_redraw) { _redraw (); } Rect intersection (i); context->rectangle (intersection.x0, intersection.y0, intersection.width(), intersection.height()); #ifdef __APPLE__ /* Below, the rendering scaling is set to support retina display */ Cairo::Matrix original_matrix = context->get_matrix(); context->scale (0.5, 0.5); context->set_source (_image, self.x0 * 2, self.y0 * 2); context->fill (); context->set_matrix (original_matrix); #else context->set_source (_image, self.x0, self.y0); context->fill (); #endif } void Text::clamp_width (double w) { if (_clamped_width == w) { return; } begin_change (); _clamped_width = w; _bounding_box_dirty = true; end_change (); } void Text::compute_bounding_box () const { if (!_canvas || _text.empty()) { _bounding_box = Rect (); _bounding_box_dirty = false; return; } if (_bounding_box_dirty) { #ifdef __APPLE__ const float retina_factor = 0.5; #else const float retina_factor = 1.0; #endif if (_need_redraw || !_image) { _redraw (); } _bounding_box = Rect (0, 0, min (_clamped_width, (double) _image->get_width() * retina_factor), _image->get_height() * retina_factor); _bounding_box_dirty = false; } } void Text::set_alignment (Pango::Alignment alignment) { if (alignment == _alignment) { return; } 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; _width_correction = -1.0; _bounding_box_dirty = true; end_change (); } void Text::set_color (Gtkmm2ext::Color color) { if (color == _color) { return; } begin_change (); _color = color; if (_outline) { set_outline_color (Gtkmm2ext::contrasting_text_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; } double Text::text_width() const { if (_need_redraw) { redraw (); } return _width; }