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Nigel Tao db892dd957 draw: clip scaling to the dst bounds. 
This is necessary for the upcoming RGBA dst fast path. The RGBA.Set slow
path will clip automatically. Accessing RGBA.Pix directly will not.

Benchmarks look like noise to me:
benchmark                     old ns/op      new ns/op      delta
BenchmarkScaleLargeDownNN     6212108        6131166        -1.30%
BenchmarkScaleLargeDownAB     15586042       15656681       +0.45%
BenchmarkScaleLargeDownBL     1518783517     1508124217     -0.70%
BenchmarkScaleLargeDownCR     2998969089     2978114154     -0.70%
BenchmarkScaleDownNN          1821187        1809314        -0.65%
BenchmarkScaleDownAB          4286983        4248974        -0.89%
BenchmarkScaleDownBL          29396818       30181926       +2.67%
BenchmarkScaleDownCR          56441945       57952417       +2.68%
BenchmarkScaleUpNN            90325384       89734496       -0.65%
BenchmarkScaleUpAB            211613922      211625435      +0.01%
BenchmarkScaleUpBL            119730880      120817135      +0.91%
BenchmarkScaleUpCR            178592665      182305702      +2.08%
BenchmarkScaleSrcNRGBA        13271034       13210760       -0.45%
BenchmarkScaleSrcRGBA         13082234       12997551       -0.65%
BenchmarkScaleSrcUniform      4003966        3934184        -1.74%
BenchmarkScaleSrcYCbCr        15939182       15900123       -0.25%

Change-Id: Ibf2843bb3c4eb695b58030e7314053c669533016
Reviewed-on: https://go-review.googlesource.com/6073
Reviewed-by: Rob Pike <r@golang.org>
2015-02-26 22:56:31 +00:00
bmp image: add import comments. 2014-12-09 22:43:18 +00:00
cmd/webp-manual-test image: add import comments. 2014-12-09 22:43:18 +00:00
draw draw: clip scaling to the dst bounds. 2015-02-26 22:56:31 +00:00
riff image: add import comments. 2014-12-09 22:43:18 +00:00
testdata draw: new package, a superset of the standard library's image/draw 2015-02-17 23:20:02 +00:00
tiff image: add import comments. 2014-12-09 22:43:18 +00:00
vp8 image: add import comments. 2014-12-09 22:43:18 +00:00
vp8l image: add import comments. 2014-12-09 22:43:18 +00:00
webp image: add import comments. 2014-12-09 22:43:18 +00:00
.gitattributes image: copying .gitattributes to all subrepositories 2014-12-23 11:05:35 +00:00
.gitignore convert .hgignore to .gitignore. 2014-12-08 10:42:30 +11:00
AUTHORS go.empty: prototype for new subrepository 2012-01-25 14:45:13 -05:00
CONTRIBUTING.md doc: add CONTRIBUTING.md 2015-02-20 05:00:47 +00:00
CONTRIBUTORS go.empty: prototype for new subrepository 2012-01-25 14:45:13 -05:00
LICENSE LICENSE: add 2012-03-17 15:20:31 +11:00
PATENTS go.image: add PATENTS file to the subrepo. 2012-04-16 11:25:02 +10:00
README go.image: initial code. 2012-01-31 11:32:50 +11:00

README 

This repository holds supplementary Go image libraries.

To submit changes to this repository, see http://golang.org/doc/contribute.html.