diff options
| author | Harry Cutts <hcutts@google.com> | 2023-11-23 11:45:48 +0000 |
|---|---|---|
| committer | Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> | 2023-11-27 21:01:38 +0000 |
| commit | e1b20730a2a0cbccb0bc4a1bd98229a33117a407 (patch) | |
| tree | 788f20ad22b988c1dfbf77a56ec4bd478f8bb426 | |
| parent | 705a01132d889586bc816edf2cefb1c541980712 (diff) | |
| download | libchrome-gestures-e1b20730a2a0cbccb0bc4a1bd98229a33117a407.tar.gz | |
Note that HardwareState::fingers can be null
BUG=b:245989146
TEST=none
Change-Id: Ie80d06b0d2e05be1190c423872465d55285e9d35
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/gestures/+/5056835
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Commit-Queue: Henry Barnor <hbarnor@chromium.org>
Tested-by: Harry Cutts <hcutts@chromium.org>
Code-Coverage: Henry Barnor <hbarnor@chromium.org>
Tested-by: Arpit Singh <arpitks@google.com>
Auto-Submit: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Henry Barnor <hbarnor@chromium.org>
Reviewed-by: Arpit Singh <arpitks@google.com>
| -rw-r--r-- | include/gestures.h | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/include/gestures.h b/include/gestures.h index e2e9c81..3ccaa20 100644 --- a/include/gestures.h +++ b/include/gestures.h @@ -243,12 +243,14 @@ struct HardwareState { // The number of fingers touching the pad, which may be more than finger_cnt. unsigned short touch_cnt; // A pointer to an array of FingerState structs with finger_cnt entries, - // representing the contacts currently being tracked. The order in which - // FingerStates appear need not be stable between HardwareStates — only the - // tracking ID is used to track individual contacts over time. Accordingly, - // when a finger is lifted from the pad (and therefore its ABS_MT_TRACKING_ID - // becomes -1), the client should simply stop including it in this array, - // rather than including a final FingerState for it. + // representing the contacts currently being tracked. If finger_cnt is 0, this + // pointer will be null. + // + // The order in which FingerStates appear need not be stable between + // HardwareStates — only the tracking ID is used to track individual contacts + // over time. Accordingly, when a finger is lifted from the pad (and therefore + // its ABS_MT_TRACKING_ID becomes -1), the client should simply stop including + // it in this array, rather than including a final FingerState for it. struct FingerState* fingers; // Mouse axes, which have the same meanings as the Linux evdev axes of the |