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allow to use cairo-image/software surface for canvas & cairowidgets

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This commit is contained in:
Robin Gareus 2014-10-28 02:15:10 +01:00
parent 6dc3a4bf61
commit b04414d170
5 changed files with 94 additions and 9 deletions
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54
libs/canvas/canvas.cc
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@ -720,6 +720,18 @@ GtkCanvas::item_going_away (Item* item, boost::optional<Rect> bounding_box)
}
void
GtkCanvas::on_size_allocate (Gtk::Allocation& a)
{
EventBox::on_size_allocate (a);
#ifdef USE_CAIRO_IMAGE_SURFACE
/* allocate an image surface as large as the canvas itself */
canvas_image.clear ();
canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, a.get_width(), a.get_height());
#endif
}
/** Handler for GDK expose events.
* @param ev Event.
* @return true if the event was handled.
@ -727,11 +739,49 @@ GtkCanvas::item_going_away (Item* item, boost::optional<Rect> bounding_box)
bool
GtkCanvas::on_expose_event (GdkEventExpose* ev)
{
#ifdef USE_CAIRO_IMAGE_SURFACE
if (!canvas_image) {
canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height());
}
{
/* scope for image_context */
Cairo::RefPtr<Cairo::Context> image_context = Cairo::Context::create (canvas_image);
/* clear expose area to transparent */
image_context->save ();
image_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
image_context->clip ();
image_context->set_operator (Cairo::OPERATOR_CLEAR);
image_context->paint ();
image_context->restore ();
/* render into image surface */
render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), image_context);
/* image surface is flushed when image_context goes out of scope */
}
/* now blit our private surface back to the GDK one */
Cairo::RefPtr<Cairo::Context> cairo_context = get_window()->create_cairo_context ();
cairo_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
cairo_context->clip ();
cairo_context->set_source (canvas_image, 0, 0);
cairo_context->set_operator (Cairo::OPERATOR_SOURCE);
cairo_context->paint ();
#else
Cairo::RefPtr<Cairo::Context> cairo_context = get_window()->create_cairo_context ();
render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), cairo_context);
#endif
return true;
}
/** Handler for GDK scroll events.