[Wayland-bugs] [Bug 94312] Whether to use the "subsurfaces"?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94312

            Bug ID: 94312
           Summary: Whether to use the "subsurfaces"?
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: wayland
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: belnd at grr.la

So, consider a button with text. In the shm file are:
    * three button states: normal, pressed and hovered pointer,
    * the rendered text.
A total of 4 bitmaps.

How best to organize the rendering of the button?
    1. To use the "subsurfaces" for the text and for the button, changing its 3
state when needed.
    2. To draw directly in "shellsurface". The text and the button state is
stored in memory, but each time the update button will be copied into a
separate memory area "wl_buffer" for "shellsurface".

At the end of the article concludes that the surface is better not to use when
building widgets. http://ppaalanen.blogspot.ru/2013/11/sub-surfaces-now.html

It turns out that you need to use method #2, but then each time you hover the
cursor, the client will copy the button state and text. You can make a crutch:
cutting text bitmap from the bitmaps of the button states, then when you hover
the cursor would to copy _only_ the button state. But still not effective..

Stop, handling the pointer-hover is possible because only in the presence of
the surface.. of a button.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/wayland-bugs/attachments/20160226/f74db949/attachment.html>