The Qt drawing api should be set with a translation, and possibly with a
clip, so that when the contents are drawn into the buffer they are
offset correctly to miss the area the window border is drawn into.
On 11/03/2012 04:46 AM, Giulio Camuffo wrote:
Hi all,
I'm trying to get decorations in QtWayland for EGL apps. The problem
that I'm facing is that I cannot find a good way to do so.
One solution could be to use an FBO, let the client draw in that and
then draw the content of the FBO into the surface whith its nifty
decoration. This would work but what happens if the client in its
rendering code calls glBindFramebuffer(0)? It will start drawing
directly to the surface and it will screw up badly.
Using an EGL pixel buffer would solve the issue, as I can call
eglMakeCurrent with that, but copying its content to the surface is slow.
A faster thing would probably be wl_egl_pixmap but it's gone.
The ideal solution would be to have an EGL extension that lets call
eglMakeCurrent with a rect that defines the boundaries of the drawable
surface.
There's NV_post_sub_buffer
(http://www.khronos.org/registry/egl/extensions/NV/EGL_NV_post_sub_buffer.txt)
but wl_egl_windows don't seem to support it.
So I'm stuck. Does anyone have an idea?
Giulio
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