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graphics.mapper@2.0: Document previously-implicit accessRegion behavior.

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Existing Android framework code (and transitively, CTS test) require
that an accessRegion of (0,0,0,0) is treated the same as an
accessRegion covering the entire buffer, when calling lock() or
lockYCbCr().

Document this so that there is no confusion about this going forward,
since this requirement pre-dates the HIDL HALs.

Bug: 119440345
Test: Builds
Change-Id: Id16831d3da4ec3dc74dbdca18447581a50ee1193
This commit is contained in:
Eino-Ville Talvala 2018-12-04 13:35:46 -08:00
parent 7cec015f22
commit 7c51e8492e
2 changed files with 4 additions and 0 deletions
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1
current.txt
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@ -396,6 +396,7 @@ da33234403ff5d60f3473711917b9948e6484a4260b5247acdafb111193a9de2 android.hardwar
d702fb01dc2a0733aa820b7eb65435ee3334f75632ef880bafd2fb8803a20a58 android.hardware.gnss@1.0::IGnssMeasurementCallback
7c7721c0f773fcf422b71a4f558545e9e36acc973e58ca51e5bd53905cf46bc0 android.hardware.graphics.bufferqueue@1.0::IGraphicBufferProducer
d4fea995378bb4f421b4e24ccf68cad2734ab07fe4f874a126ba558b99df5766 android.hardware.graphics.composer@2.1::IComposerClient
f7d7cb747dc01a9fdb2d39a80003b4d8df9be733d65f5842198802eb6209db69 android.hardware.graphics.mapper@2.0::IMapper
65a021fa89085b62fc96b2b6d3bef2f9103cf4d63379c68bc154fd9eef672852 android.hardware.health@1.0::types
b7ecf29927055ec422ec44bf776223f07d79ad9f92ccf9becf167e62c2607e7a android.hardware.keymaster@4.0::IKeymasterDevice
574e8f1499436fb4075894dcae0b36682427956ecb114f17f1fe22d116a83c6b android.hardware.neuralnetworks@1.0::IPreparedModel

3
graphics/mapper/2.0/IMapper.hal
View file

@ -147,6 +147,9 @@ interface IMapper {
* outside of accessRegion is undefined, except that it must not cause
* process termination.
*
* An accessRegion of all-zeros means the entire buffer. That is, it is
* equivalent to '(0,0)-(buffer width, buffer height)'.
*
* data will be filled with a pointer to the locked buffer memory. This
* address will represent the top-left corner of the entire buffer, even
* if accessRegion does not begin at the top-left corner.