Great!
Carlos, you rock :)
2012/10/3 Carlos López González <genet...@gmail.com>
> Hi!
> This morning I came out with another simper solution for the STRAIGHT
> method!
> It is very exciting!
> The code I previously figured out was this:
>
> /////////////////////////////////////// OLD CODE
> cairo_save(cr);
>
> // This part would retrieve the current passed surface and copy it on
> destimage
> cairo_surface_t* dest=cairo_get_target(cr);
> cairo_surface_flush(dest);
> cairo_surface_t* destimage=cairo_surface_map_to_image(dest, NULL);
>
> // Then using destimage width and height create newdest
> int w=cairo_image_surface_get_width(destimage);
> int h=cairo_image_surface_get_height(destimage);
> cairo_surface_t* newdest=cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
> w, h);
>
> // Now I paint destimage to newdest with a 1.0 -alpha mask
> cairo_t* destcr=cairo_create(newdest);
> cairo_set_source_surface(destcr, destimage, 0, 0);
> cairo_paint_with_alpha(destcr, 1.0-alpha);
> cairo_destroy(destcr);
>
> // Here I rewrite the newdest to destimage
> destcr=cairo_create(destimage);
> cairo_set_source_surface(destcr, newdest, 0, 0);
> cairo_set_operator(destcr, CAIRO_OPERATOR_SOURCE);
> cairo_paint(destcr);
> cairo_destroy(destcr);
>
> // and update the cr target (dest)
> cairo_surface_unmap_image(dest, destimage);
> cairo_surface_mark_dirty(dest);
>
> // destroy and restore
> cairo_surface_destroy(newdest);
> cairo_restore(cr);
>
> // Finally I paint with he ADD operator using alpha for the current
> cairo_t commands
> cairo_set_operator(cr, CAIRO_OPERATOR_ADD);
> cairo_paint_with_alpha(cr, alpha);
>
> ////////////////////////////// OLD CODE - end
>
> And I asked my self: Is there other way to fade out a given surface?
> The solution I did was: extract image, paint with 1.0-alpha, paint
> back and extract back.
>
> I think that I can directly paint on the given surface without need to
> map and unmap. Also I've found a way to fade out a surface in a single
> operation:
>
> // //////////////////////////////////// NEW CODE
> // First save the context status
> cairo_save(cr);
>
> // Second paint with the DEST_IN operator.
> // It would achieve the following result:
> // aR=aA*aB
> // xR=xB
> // which is exactly to fade out the destination surface
> // by the alpha of the source (1.0-alpha in this case)
> cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0-alpha);
> cairo_set_operator(cr, CAIRO_OPERATOR_DEST_IN);
> cairo_paint(cr);
>
> // Then restore the cairo context
> cairo_restore(cr);
>
> // Then paint using the ADD operator and the alpha value
> cairo_set_operator(cr, CAIRO_OPERATOR_ADD);
> cairo_paint_with_alpha(cr, alpha);
> // //////////////////////////////////// NEW CODE end
>
> I cannot test it right now, but I'm very excited on I have found a way
> to perform the desired blending operation with atomic Cairo
> instructions!!
>
> Cheers!
>
> 2012/10/2 Carlos López González <genet...@gmail.com>:
> > Thanks Konstantin. Your backing helps a lot.
> >
> > I've finally figured out how to emulate the STRAIGHT blend method
> > operation in Cairo.
> > It is an important milestone because I'm confident on being able to
> > emulate the Synfig's
> > blend methods that aren't directly supported by Cairo just using a
> > combination of Cairo's operators.
> > This means that the performance when blending can have the full
> > benefit of use Cairo native API.
> > It is possible that some of the Synfig's blend methods gets difficult
> > to emulate or impossible but
> > I hope they would be the less used.
> >
> > Cheers!
> >
> > 2012/9/29 Konstantin Dmitriev <ksee.zelga...@gmail.com>:
> >> 2012/9/29 Carlos López González <genet...@gmail.com>:
> >>> Hi!
> >>> I've added Cairo support for Shade and Bevel layers.
> >>> Again the results are very similar but slightly slower. These kind of
> layers
> >>> that manipulate pixels directly doesn't seem to improve much using
> Cairo
> >>> colors. In fact they loose time doing some unwanted operations (due
> >>> premultiplied and due to need to convert alpha to a 0-1 range) that
> doesn't
> >>> compensate the supposed speed increase for handling unsigned char in
> memory.
> >>>
> >>> I've seen that there are room for some improvements in the Paste Canvas
> >>> layer because in Cairo I didn't clip the Paste Canvas's canvas's
> context
> >>> because I didn't understand what was doing the Software. Now that I
> know
> >>> more about Cairo and that I understand what does Paste Canvas do, I
> could
> >>> try to use clip in Cairo render and so the things should improve the
> speed
> >>> for all the encapsulated layers that have defined boundaries.
> >>
> >> Hi, Carlos!
> >> It's awesom to see such a progress.
> >> >From some moment this week I've got a strong feeling that the
> >> finished cairo implementation is somewhere near, on the horizon. That
> >> is awesome. Of course, there's still a lot of work, I understand. But
> >> it will be such a significant step even if we will not gain desired
> >> speed increase!
> >> Please keep your hard work!
> >> Thank you!
> >> K.
> >>
> >>
> >>
> >> --
> >> http://morevnaproject.org/
> >>
> >>
> ------------------------------------------------------------------------------
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> >> http://info.appdynamics.com/FreeJavaPerformanceDownload.html
> >> _______________________________________________
> >> Synfig-devl mailing list
> >> Synfig-devl@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/synfig-devl
> >
> >
> >
> > --
> > Carlos
> > http://synfig.org
>
>
>
> --
> Carlos
> http://synfig.org
>
>
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