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authorcountingpine2013-07-16 16:16:08 +0100
committercountingpine2013-07-16 16:16:08 +0100
commit96c4ebe77fff9f23e085bb80a4907e6f857a96c2 (patch)
tree789a1a0ef419d812b9868dde1383e976b7abe83e /engines/kyra/items_hof.cpp
parent3d373281b440d5d139fbb01ef1ffa0ad0a76b3e8 (diff)
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SCUMM: Better Player_Mac::durationToSamples
Uses the fact that 4*480*480 == 225 << 12, and the identity (a*b)>>n == (a>>n)*b + ((a%(1<<n))*b)>>n (assuming non-overflowing math), except the rhs uses smaller intermediate values and does not overflow(*). Compared to the original code, this uses 1 fewer division and eliminates the rounding error. (*) Technical note: In some cases the right hand side of the above identity still has possibilities of intermediate overflow, but only if b > (1 << n), or if (b << n) overflows, neither of which are true here.
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