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improve hwc VSYNC documentation

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Change-Id: I5820d8fa183701ebbc0a825cf27bd0004b47d62e
This commit is contained in:
Mathias Agopian
2012-04-10 21:22:28 -07:00
parent c65a2fe392
commit 6d3fec70d8
1 changed files with 5 additions and 0 deletions
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5
include/hardware/hwcomposer.h
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@@ -331,6 +331,11 @@ typedef struct hwc_procs {
* ANDROID_URGENT_DISPLAY_PRIORITY with as little latency as possible, * ANDROID_URGENT_DISPLAY_PRIORITY with as little latency as possible,
* typically less than 0.5 ms. * typically less than 0.5 ms.
* *
* It is a (silent) error to have HWC_EVENT_VSYNC enabled when calling
* hwc_composer_device.set(..., 0, 0, 0) (screen off). The implementation
* can either stop or continue to process VSYNC events, but must not
* crash or cause other problems.
*
*/ */
void (*vsync)(struct hwc_procs* procs, int zero, int64_t timestamp); void (*vsync)(struct hwc_procs* procs, int zero, int64_t timestamp);
} hwc_procs_t; } hwc_procs_t;