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Bug 1015780 - Make Moz2D's GetAlignedStride() faster. r=Bas

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--HG--
extra : rebase_source : 6e87f0f91cd9cab03facb789f1fee700175ba102
This commit is contained in:
Jonathan Watt 2014-05-26 16:20:39 +01:00
parent b731f7650c
commit bac4b9d1ef
1 changed files with 12 additions and 5 deletions
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17
gfx/2d/Tools.h
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@ -138,14 +138,21 @@ struct AlignedArray
T *mPtr;
};
/**
* Returns aStride increased, if necessary, so that it divides exactly into
* |alignment|.
*
* Note that currently |alignment| must be a power-of-2. If for some reason we
* want to support NPOT alignment we can revert back to this functions old
* implementation.
*/
template<int alignment>
int32_t GetAlignedStride(int32_t aStride)
{
if (aStride % alignment) {
return aStride + (alignment - (aStride % alignment));
}
return aStride;
MOZ_ASSERT(aStride > 0 && (aStride & (aStride-1)) == 0,
"This implementation currently require power-of-two");
const int32_t mask = alignment - 1;
return (aStride + mask) & ~mask;
}
}