a prototype function to implement the yuv to rgb with conversion and scale.
replace with 1 step function in future version, using same API.

R=harryjin@google.com
BUG=libyuv:471

Review URL: https://codereview.chromium.org/1421553016 .

in order to compare C and Neon code, a new command line flag is added.
historically environment variables controlled cpu features, but on
android apk it is easier to pass a command line option to disable cpu
optimizations.

R=harryjin@google.com
BUG=libyuv:516

Review URL: https://codereview.chromium.org/1407193009 .

R=harryjin@google.com
BUG=none

Review URL: https://codereview.chromium.org/1399523004 .

random / rand is slow and impacts performance testing.
Although its only called to clear a frame once, a typical profile shows
it high in the overall profile, when doing 1000 frames for a benchmark.

95.10%  libyuv_unittest  libyuv_unittest      [.] YUY2ToARGBRow_SSSE3
 2.01%  libyuv_unittest  libc-2.19.so         [.] __random_r
 1.13%  libyuv_unittest  libc-2.19.so         [.] __random

Replace random is a faster version for unittests.

set LIBYUV_WIDTH=1280
set LIBYUV_HEIGHT=720
set LIBYUV_REPEAT=999
set LIBYUV_FLAGS=-1
out\release\libyuv_unittest --gtest_filter=*YUY2ToARGB*  | findms

Was
libyuvTest.YUY2ToARGB_Opt (497 ms)

Now
libyuvTest.YUY2ToARGB_Opt (454 ms)

R=harryjin@google.com
BUG=none

Review URL: https://codereview.chromium.org/1361813002 .

BUG=none
TESTED=untested
R=harryjin@google.com

Review URL: https://webrtc-codereview.appspot.com/51199004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1421 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TESTED=set LIBYUV_WIDTH=1918 libyuvTest.ScaleDownBy3by4_None
R=harryjin@google.com

Review URL: https://webrtc-codereview.appspot.com/47349004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1416 16f28f9a-4ce2-e073-06de-1de4eb20be90

Scale Down by factor tests scale down to specified ratio rather than up.  This ensures the alignment constrains on the destination dont cause a different factor to be used.
BUG=431
TESTED=libyuvTest.ScaleDownBy3_Bilinear
R=harryjin@google.com

Review URL: https://webrtc-codereview.appspot.com/47309004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1413 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=431
TESTED=ARGBScaleDownBy4_Box

Review URL: https://webrtc-codereview.appspot.com/57409004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1411 16f28f9a-4ce2-e073-06de-1de4eb20be90

make box filter upsampler consider a pixel width of less than 1 to be 1.  This makes it behave as a point sampler.
BUG=428
TESTED=set LIBYUV_WIDTH=1900 && out\release\libyuv_unittest.exe
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/49709004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1372 16f28f9a-4ce2-e073-06de-1de4eb20be90

Add a scale down by 3 test for testing general purpose box/bilinear with scale factor of 3, but allowing width/height specified to do odd with testing.
BUG=libyuv:427
TESTED=libyuvTest.ScaleDownBy3*
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/45169004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1370 16f28f9a-4ce2-e073-06de-1de4eb20be90

All cpu flags to be set so that instead of comparing C code, compare assembler to assembler, for benchmarking purposes.
BUG=none
TESTED=libyuv_unittest.exe
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/50499004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1346 16f28f9a-4ce2-e073-06de-1de4eb20be90

pavgb with memory op requires alignment.  This CL disables conversions that use pavgb, and resolves scale by 3/8 unittest for checking alignment works.  The 3/8 code used a pavgb with a memory operand.  tests are added for scaling and allow unaligning on purpose.
BUG=365
TESTED=local change to force unaligned memory fails on some conversions and scaling code.
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/29699004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1114 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=317
TESTED=drmemory out\debug\libyuv_unittest.exe --gtest_catch_exceptions=0 --gtest_filter=*ARGBScale*
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/10159004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@984 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=296
TESTED=rotate_test
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/6329004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@922 16f28f9a-4ce2-e073-06de-1de4eb20be90

NaCL pepper_33 port of scale and compare using lock/unlock.  Remove less useful scaling tests and change default size to a multiple of 16 for better assembly coverage.
BUG=none
TESTED=ncval
R=nfullagar@google.com

Review URL: https://webrtc-codereview.appspot.com/5939005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@917 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=scale unittests updated to test to/from 1 pixel
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/5479005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@908 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
R=ryanpetrie@google.com

Review URL: https://webrtc-codereview.appspot.com/5389004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@907 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=261
TESTED=valgrind
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/5129004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@895 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TESTED=untested
R=wuwang@google.com

Review URL: https://webrtc-codereview.appspot.com/4479004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@875 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/3979007

git-svn-id: http://libyuv.googlecode.com/svn/trunk@864 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
R=johannkoenig@google.com

Review URL: https://webrtc-codereview.appspot.com/3929004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@855 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=*Linear*
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/3689004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@848 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=ncval
R=nfullagar@google.com

Review URL: https://webrtc-codereview.appspot.com/2719004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@822 16f28f9a-4ce2-e073-06de-1de4eb20be90

Coalesce rows by changing width/height and dropping into code instead of recursing.  Improve coalesce by setting stride to 0 so it can be used even on odd width images.  Reduce unittests to improve time to run emulators.
BUG=277
TEST=unittests all build and pass
R=ryanpetrie@google.com

Review URL: https://webrtc-codereview.appspot.com/2589004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@819 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=273
TEST=timex emuyuv Scale*
R=ryanpetrie@google.com

Review URL: https://webrtc-codereview.appspot.com/2469005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@815 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=260
TEST=ScaleDownByVertical2by3_Bilinear
R=jingning@google.com, thorcarpenter@google.com

Review URL: https://webrtc-codereview.appspot.com/2165004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@779 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=FixedDiv*
R=johannkoenig@google.com

Review URL: https://webrtc-codereview.appspot.com/1668004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@727 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
R=dingkai@google.com

Review URL: https://webrtc-codereview.appspot.com/1667004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@726 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=244
TEST=*ScaleFrom1366x768_Box
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1644004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@720 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=*Scale*
R=mikhal@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1608005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@718 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=*Scale* unittests
R=fischman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1599005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@716 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=237
TEST=Scale*
R=ryanpetrie@google.com

Review URL: https://webrtc-codereview.appspot.com/1587004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@710 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=226
TESTED=libyuv scale unittests
Review URL: https://webrtc-codereview.appspot.com/1470004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@694 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=lint
Review URL: https://webrtc-codereview.appspot.com/1417004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@686 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=220
TEST=convert util and ARGBScale unittests with set LIBYUV_WIDTH=-1280
Review URL: https://webrtc-codereview.appspot.com/1409005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@685 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=208
TEST=out\release\libyuv_unittest --gtest_filter=*ARGBScale*640*

Review URL: https://webrtc-codereview.appspot.com/1303006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@664 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=208
TEST=out\release\libyuv_unittest --gtest_filter=*Scale*640*
Review URL: https://webrtc-codereview.appspot.com/1283008

git-svn-id: http://libyuv.googlecode.com/svn/trunk@649 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=208
TEST=out\release\libyuv_unittest --gtest_filter=*Scale*640*
Review URL: https://webrtc-codereview.appspot.com/1294004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@648 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/1255004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@623 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=208
TESTED=out\release\libyuv_unittest --gtest_filter=*ScaleFrom*
Review URL: https://webrtc-codereview.appspot.com/1250004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@620 16f28f9a-4ce2-e073-06de-1de4eb20be90