Make gMask_00FF00FF a constant
This is to optimize SkAlphaMulQ() in PIC mode. With the visibility=default
symbol the constant is not known at compile time (and is not a constant), but
instead is fetched through a double indirection through GOT. The function is
quite hot on one of the chromium benchmarks:
rasterize_and_record_micro.key_silk_cases.
This change replaces the symbol with a compile-time constant. As a bonus the
variable is not exported from the dynamic library, i. e. a cleaner library
interface.
See specific performance improvements on Android here:
http://goo.gl/iMuTDt
R=skyostil@chromium.org, tomhudson@chromium.org, mtklein@google.com, reed@google.com, tomhudson@google.com
Author: pasko@chromium.org
Review URL: https://codereview.chromium.org/270473003
git-svn-id: http://skia.googlecode.com/svn/trunk@14696 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed