On 22 June 2012 01:04, Emmanuele Bassi <eba...@gmail.com> wrote: > hi; > > On 21 June 2012 21:19, Vivien Malerba <vmale...@gmail.com> wrote: > > I have a project using GooCanvas at the moment and was considering the > idea > > of using Clutter instead. The only thing which bothers me at the moment > is > > that using GooCanvas I can request the canvas to be rendered to a > specific > > cairo context (cairo_t type), which allows me to export to an SVG file, a > > PNG file or even print a diagram (using GtkPrintOperation and related). > > > > Is there any possibility to do the same with clutter (i.e. draw a clutter > > actor or stage to a specific cairo_t context)? > > not really, no; unlike GooCanvas, Clutter does not use Cairo to render > its scene graph, so you cannot simply create a cairo_surface_t or a > cairo_t and point Clutter in its direction. > > you may be able to render a complex Actor to an offscreen buffer, and > then take the contents of the buffer from the GPU and place them into > an image surface; you could also use clutter_stage_read_pixels() to > read back the contents of the Stage after it has been painted (using a > repaint function) and then place them into an image surface. reading > back data from the GPU is not extremely cheap, especially if you're > reading back large chunks of data. obviously, this would also mean > that what you get are the contents of the screen, and you don't get to > display them differently depending on the rendering target - nor that > primitives will get serialised to Cairo commands, except "put image > data at these coordinates". >
Ok, thanks for this suggestion. I've also found that the ClutterCanvas object would be a good starting point, simple to start with, so I'll investigate this first. Thanks again, Vivien
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