newbitmaps: Speed up make_default_yaml.
Sub-shell execution is slow. To improve shell script execution speed:
- Replae $(expr) by $(()).
- Cache image file data and avoid executing ImageMagick.
- Prevent extra eval & subshell.
- Remove bash-only syntax to allow using dash.
# time ../make_default_yaml en
Before change: Real 9s, User 1m7s.
After (bash): Real 1.6s, User 8.8s.
After (dash): Real 1.0s, User 6.9s.
BRANCH=none
BUG=none
TEST=make
Change-Id: I59626fb1a211de82cf58fcd1331a5641b97e2823
Reviewed-on: https://gerrit.chromium.org/gerrit/37006
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
2 files changed