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base repository: racket/racket
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head repository: gcr/racket
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compare: master
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  • 2 commits
  • 1 file changed
  • 1 contributor

Commits on Dec 16, 2012

  1. Speed up set-argb-pixels by using local references to b&w? and alpha-… 

    …channel?

In set-argb-pixels, the critical loop for each pixel tests the value
of a boolean that was defined at the top level of the class. Forcing
these to be local variables gives a speedup of 1.5.
    @gcr
    gcr committed Dec 16, 2012
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    a91535c View commit details
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  2. Speed up set-argb-pixels by using unsafe operations. 

    Presumably, values shouldn't ever wrap and the bytestring is already
assured to be long enough, so using safe operations isn't strictly
necessary. This dangerous improvement yields speedup factor of ~1.86.
    @gcr
    gcr committed Dec 16, 2012
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    2de232e View commit details
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