| commit | fcd2d9cd75e6307b5b72fed2201044e231bef40a | [log] [tgz] |
|---|---|---|
| author | Olivier Wulveryck <olivier.wulveryck@gmail.com> | Mon May 31 08:03:57 2021 +0200 |
| committer | Nigel Tao <nigeltao@golang.org> | Mon Oct 25 12:07:15 2021 +0000 |
| tree | 6cb35379911e0bcf19767525992909ec82b14c4f | |
| parent | 7b554575e46d1df9b68f71e051c8133aaf953fb7 [diff] |
image/draw: improve performances if mask is *image.Alpha The existing DrawMask method is generic and is therefore calling the At().RGBA() method for every pixel of the mask and the source. Do a specific implementation when the mask is *image.Alpha (which is common) and use use the PixOffset method to increase performances. name old time/op new time/op delta RGBA2-12 1.60ms ± 0% 1.13ms ± 1% -29.16% (p=0.008 n=5+5) GenericMaskOver-12 915µs ± 4% 926µs ± 1% ~ (p=0.190 n=5+4) RGBA64Over-12 1.53ms ± 3% 1.21ms ± 2% -20.74% (p=0.008 n=5+5) GrayOver-12 1.36ms ± 2% 1.01ms ± 7% -26.27% (p=0.008 n=5+5) Fixes: #46395 Change-Id: Iaeaa8cfcc6a3fe93eb19b361f3bf076e41cac5b6 Reviewed-on: https://go-review.googlesource.com/c/go/+/323749 Reviewed-by: Nigel Tao <nigeltao@golang.org> Trust: Nigel Tao <nigeltao@golang.org> Trust: Andrew Gerrand <adg@golang.org> Run-TryBot: Nigel Tao <nigeltao@golang.org>
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