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add some comments to Canvas::Image and ensure that the canvas redraws after a put_image() call is handled in the GUI thread

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This commit is contained in:
Paul Davis 2013-04-15 22:34:36 -04:00
parent 37dd7e952b
commit be23e48e7f
2 changed files with 30 additions and 0 deletions
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9
libs/canvas/image.cc
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@ -60,6 +60,8 @@ Image::compute_bounding_box () const
boost::shared_ptr<Image::Data>
Image::get_image ()
{
/* can be called by any thread */
int stride = Cairo::ImageSurface::format_stride_for_width (_format, _width);
boost::shared_ptr<Data> d (new Data (boost::shared_array<uint8_t> (new uint8_t[stride*_height]), _width, _height, stride, _format));
@ -69,6 +71,8 @@ Image::get_image ()
void
Image::put_image (boost::shared_ptr<Data> d)
{
/* can be called by any thread */
_pending = d;
DataReady (); /* EMIT SIGNAL */
}
@ -77,8 +81,13 @@ void
Image::accept_data ()
{
/* must be executed in gui thread */
begin_change ();
_current = _pending;
_pending.reset ();
_need_render = true;
end_change (); // notify canvas that we need redrawing
}