[qcms] Fix overflow when reading parametric gamma curves

[qcms] Fix overflow when reading parametric gamma curves

The ICC spec does not impose input restrictions to compute a parametric
curve LUT. The largest value computed can reach about pow(65536,32768).
To prevent explicit handling of a large double, use powf(), and prevent
precision loss by executing right-to-left.

BUG=708143
Review-Url: https://codereview.chromium.org/2796893002
Cr-Commit-Position: refs/heads/master@{#461947}
Committed: https://chromium.googlesource.com/chromium/src/+/0eb3418b597de14bff675fde0e575fbc947ff962

[Noel Gordon, 2017-04-04 13:01:42]

The CQ bit was checked by noel@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-04 13:02:17]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Noel Gordon, 2017-04-04 13:03:55]

noel@chromium.org changed reviewers:
+ hubbe@chromium.org

[Noel Gordon, 2017-04-04 13:03:56]

PTAL.

[commit-bot: I haz the power, 2017-04-04 13:58:52]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-04 13:58:53]

Dry run: This issue passed the CQ dry run.

[hubbe, 2017-04-04 17:31:50]

The CQ bit was checked by hubbe@chromium.org

[hubbe, 2017-04-04 17:31:57]

The CQ bit was unchecked by hubbe@chromium.org

[hubbe, 2017-04-04 17:32:02]

lgtm

[Noel Gordon, 2017-04-05 01:37:11]

The CQ bit was checked by noel@chromium.org

[Noel Gordon, 2017-04-05 01:37:11]

The patchset sent to the CQ was uploaded after l-g-t-m from hubbe@chromium.org
Link to the patchset: https://codereview.chromium.org/2796893002/#ps20001
(title: "Sync up, fix QCMS tab vs. spaces per usual.")

[commit-bot: I haz the power, 2017-04-05 01:37:37]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-05 02:37:24]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1491356231541830,
"parent_rev": "55c1955a872e9e0b23cf17781a026035cf264a0b", "commit_rev":
"0eb3418b597de14bff675fde0e575fbc947ff962"}

[commit-bot: I haz the power, 2017-04-05 02:38:18]

Description was changed from

==========
[qcms] Fix overflow when reading parametric gamma curves

The ICC spec does not impose input restrictions to compute a parametric
curve LUT. The largest value computed can reach about pow(65536,32768).
To prevent explicit handling of a large double, use powf(), and prevent
precision loss by executing right-to-left.

BUG=708143
==========

to

==========
[qcms] Fix overflow when reading parametric gamma curves

The ICC spec does not impose input restrictions to compute a parametric
curve LUT. The largest value computed can reach about pow(65536,32768).
To prevent explicit handling of a large double, use powf(), and prevent
precision loss by executing right-to-left.

BUG=708143

Review-Url: https://codereview.chromium.org/2796893002
Cr-Commit-Position: refs/heads/master@{#461947}
Committed:
https://chromium.googlesource.com/chromium/src/+/0eb3418b597de14bff675fde0e57...
==========

[commit-bot: I haz the power, 2017-04-05 02:38:19]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/0eb3418b597de14bff675fde0e57...