Road to pixman 0.16.0

[Soeren Sandmann]

Hi,

Pixman 0.15.16 contains the last bits of refactoring, so from now on,
there will be a coding style enforced. The coding style is similar to
cairo's, with the main difference being that braces go on their own
line always. Ie., 

        if (...)
        {
        }

and not

        if (...) {
        }

The cairo coding style document is here:

        http://cgit.freedesktop.org/cairo/tree/CODING_STYLE

Here is a rough road map for the remaining things before 0.16.0:

* Disable region self-check

* MSVC fixes.

   - The Makefile.win32 broke as Rainman Lee pointed out.

   - There is this bug:

       https://bugs.freedesktop.org/show_bug.cgi?id=22390

     with fixes for sse2 on x64. The mmx file there seems sane to me,
     but it would be good if someone with access to Windows can verify
     that it work.

  Someone with access to this compiler, please help out if you can.

* ARM fixes

  - The current code is not releasable.

    Unless I hear otherwise, I'll just apply Siarhei's fixes after
    they are updated for code style issues.

  - Build fixes for older CPUs:
        
        https://bugs.freedesktop.org/show_bug.cgi?id=22692

    Siarhei says it's reasonable, so unless I hear otherwise, I'll
    apply that as well.

* Merge the blitter-test code.

  - Some changes are needed; see other mail.

* Fix bugs reported by the blitter-test

  - The discrepancies between the architecture specific code and the
    general C code should be tracked down and fixed.

  - It should be tracked down why enabling component-alpha causes
    crashes.

* Fix performance regressions.

  There have been reports of performance regressions. The ones I am
  aware of are:

  - Image allocation may have become slower

  - _pixman_run_fast_path() may have too much overhead

  - Delegates may have too much overhead

  - Carl reported that the swfdec-fill-rate-2xaa perf-trace had a 25%
    performance regression between 0.15.1 and 0.15.13

Let me know if I missed anything.

There will be at least one, and probably two, development releases
before 0.16.0. I'll be spending a bit less time on pixman in the
coming weeks, so help is appreciated with the above items.


Thanks,
Soren