SSE2 optimizations for 32bit blending blitters

This CL implements SSE2 optimizations for 3 of the 32bit blending blitters.  It uses CPUID to detect for SSE2 at runtime.  In order to accomodate runtime detection, it changes the platform procs from static arrays to static functions.

It also includes an implementation of SkTime_Unix for Win32 (the file should probably be renamed).

[reed, 2009-11-04 18:47:08]

LGMT, module some minor comments

http://codereview.appspot.com/144072/diff/1/2
File include/config/SkUserConfig.h (right):

http://codereview.appspot.com/144072/diff/1/2#newcode128
Line 128: /*  The SK_SSE2 flag enables compile-time support for SSE2
optimizations.
Can we remove this change?

http://codereview.appspot.com/144072/diff/1/3
File include/core/SkBlitRow.h (right):

http://codereview.appspot.com/144072/diff/1/3#newcode73
Line 73: 
Capitalize static methods

http://codereview.appspot.com/144072/diff/1/7
File src/ports/SkTime_Unix.cpp (right):

http://codereview.appspot.com/144072/diff/1/7#newcode50
Line 50: #elif defined(SK_BUILD_FOR_WIN)
can we move this into its own file?

[reed, 2009-11-04 18:47:57]

http://codereview.appspot.com/144072/diff/1/4
File src/opts/SkBlitRow_opts_SSE2.cpp (right):

http://codereview.appspot.com/144072/diff/1/4#newcode21
Line 21: 
Do we still need this flag/test?

[Stephen White, 2009-11-04 19:19:07]

http://codereview.appspot.com/144072/diff/1/2
File include/config/SkUserConfig.h (right):

http://codereview.appspot.com/144072/diff/1/2#newcode128
Line 128: /*  The SK_SSE2 flag enables compile-time support for SSE2
optimizations.
On 2009/11/04 18:47:08, reed wrote:
> Can we remove this change?

The one advantage of this is it's really easy to turn on & off.  With the file
substitution, I have to regenerate our makefiles after changing.  Not a big deal
though.  Will remove.

http://codereview.appspot.com/144072/diff/1/3
File include/core/SkBlitRow.h (right):

http://codereview.appspot.com/144072/diff/1/3#newcode73
Line 73: 
On 2009/11/04 18:47:08, reed wrote:
> Capitalize static methods

Done.

http://codereview.appspot.com/144072/diff/1/4
File src/opts/SkBlitRow_opts_SSE2.cpp (right):

http://codereview.appspot.com/144072/diff/1/4#newcode21
Line 21: 
On 2009/11/04 18:47:57, reed wrote:
> Do we still need this flag/test?

Removed.

http://codereview.appspot.com/144072/diff/1/7
File src/ports/SkTime_Unix.cpp (right):

http://codereview.appspot.com/144072/diff/1/7#newcode50
Line 50: #elif defined(SK_BUILD_FOR_WIN)
On 2009/11/04 18:47:08, reed wrote:
> can we move this into its own file?

Done.

[Stephen White, 2009-11-04 19:28:44]

Responding to comments

[reed, 2009-11-04 20:35:02]

On 2009/11/04 19:28:44, Stephen White wrote:
> Responding to comments

LGTM - awesome to get the SSE2 code in, thanks!