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#include "canvas/image.h"
#include "gtkmm2ext/gui_thread.h"
using namespace ArdourCanvas;
Image::Image (Group* group, Cairo::Format fmt, int width, int height)
: Item (group)
, _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);
}
_current.reset ();
context->set_source (_surface, 0, 0);
context->rectangle (area.x0, area.y0, area.width(), area.height());
context->fill ();
}
void
Image::compute_bounding_box () const
{
_bounding_box = boost::optional<Rect> (Rect (0, 0, _width, _height));
_bounding_box_dirty = false;
}
boost::shared_ptr<Image::Data>
Image::get_image ()
{
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));
return d;
}
void
Image::put_image (boost::shared_ptr<Data> d)
{
_pending = d;
DataReady (); /* EMIT SIGNAL */
}
void
Image::accept_data ()
{
/* must be executed in gui thread */
_current = _pending;
_pending.reset ();
_need_render = true;
}
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