Artyom Pervukhin 088209bbe8 image/draw: reduce drawPaletted allocations for special source cases ... drawPaletted has to discover R,G,B,A color values of each source image pixel in a given rectangle. Doing that by calling image.Image.At() method returning color.Color interface is quite taxing allocation-wise since interface values go through heap. Introduce special cases for some concrete source types by fetching color values using type-specific methods. name old time/op new time/op delta Paletted-4 7.62ms ± 4% 3.72ms ± 3% -51.20% (p=0.008 n=5+5) name old alloc/op new alloc/op delta Paletted-4 480kB ± 0% 0kB ± 0% -99.99% (p=0.000 n=4+5) name old allocs/op new allocs/op delta Paletted-4 120k ± 0% 0k ± 0% -100.00% (p=0.008 n=5+5) Updates #15759. Change-Id: I0ce1770ff600ac80599541aaad4c2c826855c8fb Reviewed-on: https://go-review.googlesource.com/72370 Reviewed-by: Nigel Tao <nigeltao@golang.org>		2017-10-25 23:43:27 +00:00
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color	all: fix article typos	2017-09-15 02:39:16 +00:00
draw	image/draw: reduce drawPaletted allocations for special source cases	2017-10-25 23:43:27 +00:00
gif	image/gif: avoid setting defers in the decode loop	2017-10-23 22:59:18 +00:00
internal/imageutil	image/color: tweak the YCbCr to RGBA conversion formula again.	2017-02-10 22:57:50 +00:00
jpeg	image/gif: add BenchmarkDecode.	2017-10-07 05:23:42 +00:00
png	image/png: fix width * height * bpp overflow check.	2017-10-21 22:00:32 +00:00
testdata	image/jpeg: reconstruct progressive images even if incomplete.	2016-03-31 00:33:24 +00:00
decode_example_test.go	image/color: tweak the YCbCr to RGBA conversion formula.	2015-07-15 05:29:00 +00:00
decode_test.go	image/jpeg: reconstruct progressive images even if incomplete.	2016-03-31 00:33:24 +00:00
format.go	build: move package sources from src/pkg to src	2014-09-08 00:08:51 -04:00
geom.go	image: fix the overlap check in Rectangle.Intersect.	2017-02-10 05:05:59 +00:00
geom_test.go	image: fix the overlap check in Rectangle.Intersect.	2017-02-10 05:05:59 +00:00
image.go	image: add NYCbCrA types.	2015-10-11 11:07:25 +00:00
image_test.go	all: remove some unused parameters in test code	2017-04-25 14:38:10 +00:00
names.go	build: move package sources from src/pkg to src	2014-09-08 00:08:51 -04:00
ycbcr.go	image: add NYCbCrA types.	2015-10-11 11:07:25 +00:00
ycbcr_test.go	image: add YCbCrSubsampleRatio411 and YCbCrSubsampleRatio410.	2015-02-26 00:14:16 +00:00