X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fcanvas%2Ftext.cc;h=438413080a2d7a539283bf157980e5f0d15f126a;hb=007e6bb15b63506a1789fc2159386b48da413130;hp=feb88e199649c7ad9edb44dd4b2b54ad4a07f0fe;hpb=19bd6419157119b976393a0c5966b4be4c962119;p=ardour.git

diff --git a/libs/canvas/text.cc b/libs/canvas/text.cc
index feb88e1996..438413080a 100644
--- a/libs/canvas/text.cc
+++ b/libs/canvas/text.cc
@@ -1,5 +1,29 @@
+/*
+    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/xml++.h"
+
+#include "pbd/stacktrace.h"
+
 #include "canvas/text.h"
 #include "canvas/canvas.h"
 #include "canvas/utils.h"
@@ -9,9 +33,13 @@ using namespace ArdourCanvas;
 
 Text::Text (Group* parent)
 	: Item (parent)
-	, _font_description (0)
 	, _color (0x000000ff)
+	, _font_description (0)
 	, _alignment (Pango::ALIGN_LEFT)
+	, _width (0)
+	, _height (0)
+	, _need_redraw (false)
+	, _clamped_width (COORD_MAX)
 {
 
 }
@@ -27,67 +55,113 @@ Text::set (string const & text)
 	begin_change ();
 	
 	_text = text;
-	
+
+	_need_redraw = true;
 	_bounding_box_dirty = true;
+
 	end_change ();
 }
 
 void
-Text::compute_bounding_box () const
+Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
 {
-	if (!_canvas || !_canvas->context ()) {
-		_bounding_box = boost::optional<Rect> ();
-		_bounding_box_dirty = false;
+	if (_text.empty()) {
 		return;
 	}
-	
-	Pango::Rectangle const r = layout (_canvas->context())->get_ink_extents ();
-	
-	_bounding_box = Rect (
-		r.get_x() / Pango::SCALE,
-		r.get_y() / Pango::SCALE,
-		(r.get_x() + r.get_width()) / Pango::SCALE,
-		(r.get_y() + r.get_height()) / Pango::SCALE
-		);
-	
-	_bounding_box_dirty = false;
+
+	Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
+
+	_redraw (layout);
 }
 
-Glib::RefPtr<Pango::Layout>
-Text::layout (Cairo::RefPtr<Cairo::Context> context) const
+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);
-	return layout;
+	
+	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
 {
-	set_source_rgba (context, _color);
-	layout (context)->show_in_cairo_context (context);
+	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 ();
 }
 
-XMLNode *
-Text::get_state () const
+void
+Text::clamp_width (double w)
 {
-	XMLNode* node = new XMLNode ("Text");
-#ifdef CANVAS_DEBUG
-	if (!name.empty ()) {
-		node->add_property ("name", name);
-	}
-#endif
-	return node;
+	_clamped_width = w;
 }
 
 void
-Text::set_state (XMLNode const * /*node*/)
+Text::compute_bounding_box () const
 {
-	/* XXX */
+	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
@@ -96,7 +170,7 @@ Text::set_alignment (Pango::Alignment alignment)
 	begin_change ();
 	
 	_alignment = alignment;
-
+	_need_redraw = true;
 	_bounding_box_dirty = true;
 	end_change ();
 }
@@ -107,6 +181,7 @@ 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 ();
@@ -118,8 +193,19 @@ 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;
+}