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| author | Jamie Gennis <jgennis@google.com> | 2011-12-20 14:33:52 -0800 |
|---|---|---|
| committer | Jamie Gennis <jgennis@google.com> | 2011-12-20 14:33:52 -0800 |
| commit | 9c5466b6167a773eb4a313a59fddbcd986973120 (patch) | |
| tree | d3c89ef67ee71e67da87eff60e72b28b463bfe7c /include/hardware/hwcomposer.h | |
| parent | 72ba865479be8c7393923b6ea195196838ffa57b (diff) | |
| download | hardware_libhardware-9c5466b6167a773eb4a313a59fddbcd986973120.zip hardware_libhardware-9c5466b6167a773eb4a313a59fddbcd986973120.tar.gz hardware_libhardware-9c5466b6167a773eb4a313a59fddbcd986973120.tar.bz2 | |
HWComposer: update the hwc_layer::handle docs
Change-Id: I3c1211146b2e5f84546724c86f344bd2e63bd55c
Diffstat (limited to 'include/hardware/hwcomposer.h')
| -rw-r--r-- | include/hardware/hwcomposer.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/hardware/hwcomposer.h b/include/hardware/hwcomposer.h index b4a7a7a..f788e46 100644 --- a/include/hardware/hwcomposer.h +++ b/include/hardware/hwcomposer.h @@ -150,8 +150,12 @@ typedef struct hwc_layer { /* see hwc_layer_t::flags above */ uint32_t flags; - /* handle of buffer to compose. this handle is guaranteed to have been - * allocated with gralloc */ + /* handle of buffer to compose. This handle is guaranteed to have been + * allocated from gralloc using the GRALLOC_USAGE_HW_COMPOSER usage flag. If + * the layer's handle is unchanged across two consecutive prepare calls and + * the HWC_GEOMETRY_CHANGED flag is not set for the second call then the + * HWComposer implementation may assume that the contents of the buffer have + * not changed. */ buffer_handle_t handle; /* transformation to apply to the buffer during composition */ |