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livetrax/libs/canvas/text.cc

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/*
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/window.h>
#include <gtkmm/label.h>
#include "pbd/stacktrace.h"
#include "canvas/text.h"
#include "canvas/canvas.h"
#include "canvas/utils.h"
#include "canvas/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)
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, _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;
}
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Text::~Text ()
{
delete _font_description;
}
void
Text::set (string const & text)
{
begin_change ();
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_text = text;
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_need_redraw = true;
_bounding_box_dirty = true;
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end_change ();
}
void
Text::_redraw () const
{
assert (!_text.empty());
Glib::RefPtr<Pango::Context> context = Glib::wrap (gdk_pango_context_get());
Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
#ifdef __APPLE__
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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 ();
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int width = 0;
int height = 0;
Glib::RefPtr<Pango::Layout> test_layout = foo.create_pango_layout ("H");
if (_font_description) {
test_layout->set_font_description (*_font_description);
}
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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
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_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width, _height);
#endif
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Cairo::RefPtr<Cairo::Context> img_context = Cairo::Context::create (_image);
#ifdef __APPLE__
/* Below, the rendering scaling is set to support retina display
*/
img_context->scale (2, 2);
#endif
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/* and draw, in the appropriate color of course */
if (_outline) {
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 ();
set_source_rgba (img_context, _color);
img_context->fill ();
} else {
set_source_rgba (img_context, _color);
layout->show_in_cairo_context (img_context);
}
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/* text has now been rendered in _image and is ready for blit in
* ::render
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*/
_need_redraw = false;
}
void
Text::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
if (_text.empty()) {
return;
}
Rect self = item_to_window (Rect (0, 0, min (_clamped_width, (double)_image->get_width ()), _image->get_height ()));
boost::optional<Rect> i = self.intersection (area);
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if (!i) {
return;
}
if (_need_redraw) {
_redraw ();
}
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Rect intersection (i.get());
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 = boost::optional<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)
{
begin_change ();
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_alignment = alignment;
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_need_redraw = true;
_bounding_box_dirty = true;
end_change ();
}
void
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Text::set_font_description (Pango::FontDescription font_description)
{
begin_change ();
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_font_description = new Pango::FontDescription (font_description);
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_need_redraw = true;
_width_correction = -1.0;
_bounding_box_dirty = true;
end_change ();
}
void
Text::set_color (Color color)
{
begin_change ();
_color = color;
if (_outline) {
set_outline_color (contrasting_text_color (_color));
}
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_need_redraw = true;
end_change ();
}
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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;
}