On Thu, Apr 25, 2013 at 5:32 AM, Emmanuel Rodriguez < emmanuel.rodrig...@gmail.com> wrote:
> > > > On 24 April 2013 09:32, Jianhua Shao <alex....@gmail.com> wrote: > >> >> I build webkitgtk 1.9.92 by below configuration >> ./configure --prefix=/usr --enable-accelerated-compositing >> --enable-fast-mobile-scrolling --enable-jit --disable-webkit2 >> --disable-plugin-process --disable-gtk-doc-html --with-gtk=2.0 >> --with-acceleration-backend=opengl >> >> After that, I write a simple app to make the content of webview >> transparent by calling webkit_web_view_set_transparent(). But it failed. >> I tryied version 1.11.5, it also does not work. >> The same app source code works in a old version of gtk-webkit, AFAIK, it >> was about gtk-webkit 1.3. >> > > Can you try to build gtk-webkit 1.6.3 and see if it works? > > I experience a similar problem in which calling webkit_web_view_draw() > with a custom Cairo context would behave strangely since gtk-webkit 1.8. In > my case I wanted to save a webpage as a PDF with a Cairo context that's > backed by a PDF surface. Since gtk-webkit 1.8 the PDF is composed of a big > rasterized image and is no longer vectorial. > > From what I saw in the code base of gtk-webkit 1.8, webkit_web_view_draw() > is now using a backing buffer to do all it's rendering and doesn't take the > Cairo context pass in argument into account, all that it does is to copy > the backing buffer into the Cairo context. > > I believe that this is why you're losing the transparency in your main > window and why my PDFs are no longer vectorial. > > Maybe someone that knows more about the internals of gtk-webkit can give > use more insight. > Thanks for sharing your experience. The version 1.6.3 does not meet my requirements. "enable-accelerated-compositing" is what I need in the newer version, from the dev document I found it is available from version 1.7.5. Seems I can give a try on version 1.7.x. And have you read my another mail, cairo_surface_t* surface = webkit_web_view_get_snapshot(view); cairo_surface_write_to_png(surface, "/home/meego/dump.png"); will result a transparent png file... Maybe I need to do some configuration on cario/gtk, but I am new on this subject, anyone can give me some hint? > -- > Emmanuel Rodriguez >
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