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