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pre-render text canvas items so that ::render() is just a blit from an image surface

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This commit is contained in:
Paul Davis 2013-04-06 18:35:32 -04:00
parent bcd65def7d
commit b9750bac72
2 changed files with 52 additions and 31 deletions
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69
libs/canvas/text.cc
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@ -1,5 +1,8 @@
#include <cairomm/cairomm.h>
#include <gtkmm/label.h>
#include "pbd/xml++.h"
#include "canvas/text.h"
#include "canvas/canvas.h"
#include "canvas/utils.h"
@ -9,9 +12,12 @@ using namespace ArdourCanvas;
Text::Text (Group* parent)
: Item (parent)
, _font_description (0)
, _image (0)
, _color (0x000000ff)
, _font_description (0)
, _alignment (Pango::ALIGN_LEFT)
, _width (0)
, _height (0)
{
}
@ -27,49 +33,56 @@ Text::set (string const & text)
begin_change ();
_text = text;
redraw ();
_bounding_box_dirty = true;
end_change ();
}
void
Text::compute_bounding_box () const
Text::redraw ()
{
if (!_canvas || !_canvas->context ()) {
_bounding_box = boost::optional<Rect> ();
_bounding_box_dirty = false;
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;
}
_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width, _height);
Glib::RefPtr<Pango::Layout>
Text::layout (Cairo::RefPtr<Cairo::Context> context) const
{
Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (_image);
Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
layout->set_text (_text);
if (_font_description) {
layout->set_font_description (*_font_description);
}
layout->set_alignment (_alignment);
return layout;
Pango::Rectangle ink_rect = layout->get_ink_extents();
_origin.x = ink_rect.get_x() / Pango::SCALE;
_origin.y = ink_rect.get_y() / Pango::SCALE;
_width = (ink_rect.get_width() + Pango::SCALE / 2) / Pango::SCALE;
_height = (ink_rect.get_height() + Pango::SCALE / 2) / Pango::SCALE;
set_source_rgba (context, _color);
layout->show_in_cairo_context (context);
/* text has now been rendered */
}
void
Text::compute_bounding_box () const
{
_bounding_box = Rect (_origin.x, _origin.y, _origin.x + _width, _origin.y + _height);
_bounding_box_dirty = 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);
context->set_source (_image, 0, 0);
context->rectangle (0, 0, _width, _height);
context->fill ();
}
XMLNode *
@ -96,7 +109,7 @@ Text::set_alignment (Pango::Alignment alignment)
begin_change ();
_alignment = alignment;
redraw ();
_bounding_box_dirty = true;
end_change ();
}
@ -107,6 +120,7 @@ Text::set_font_description (Pango::FontDescription font_description)
begin_change ();
_font_description = new Pango::FontDescription (font_description);
redraw ();
_bounding_box_dirty = true;
end_change ();
@ -118,6 +132,7 @@ Text::set_color (Color color)
begin_change ();
_color = color;
redraw ();
end_change ();
}