98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
/*
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Copyright (C) 2013 Paul Davis
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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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#include "canvas/image.h"
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#include "gtkmm2ext/gui_thread.h"
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using namespace ArdourCanvas;
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Image::Image (Group* group, Cairo::Format fmt, int width, int height)
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: Item (group)
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, _format (fmt)
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, _width (width)
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, _height (height)
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, _need_render (false)
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{
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DataReady.connect (data_connections, MISSING_INVALIDATOR, boost::bind (&Image::accept_data, this), gui_context());
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}
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void
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Image::render (Rect const& area, Cairo::RefPtr<Cairo::Context> context) const
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{
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if (_need_render && _pending) {
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_surface = Cairo::ImageSurface::create (_pending->data,
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_pending->format,
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_pending->width,
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_pending->height,
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_pending->stride);
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_current = _pending;
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}
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Rect self = item_to_window (Rect (0, 0, _width, _height));
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boost::optional<Rect> draw = self.intersection (area);
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if (_surface && draw) {
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context->set_source (_surface, 0, 0);
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context->rectangle (draw->x0, draw->y0, draw->width(), draw->height());
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context->fill ();
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}
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}
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void
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Image::compute_bounding_box () const
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{
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_bounding_box = boost::optional<Rect> (Rect (0, 0, _width, _height));
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_bounding_box_dirty = false;
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}
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boost::shared_ptr<Image::Data>
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Image::get_image (bool allocate_data)
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{
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/* can be called by any thread */
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int stride = Cairo::ImageSurface::format_stride_for_width (_format, _width);
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if (allocate_data) {
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boost::shared_ptr<Data> d (new Data (new uint8_t[stride*_height], _width, _height, stride, _format));
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return d;
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} else {
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boost::shared_ptr<Data> d (new Data (NULL, _width, _height, stride, _format));
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return d;
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}
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}
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void
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Image::put_image (boost::shared_ptr<Data> d)
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{
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/* can be called by any thread */
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_pending = d;
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DataReady (); /* EMIT SIGNAL */
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}
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void
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Image::accept_data ()
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{
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/* must be executed in gui thread */
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begin_change ();
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_need_render = true;
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end_change (); // notify canvas that we need redrawing
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}
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