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Nigel Tao 3a0cda43a4 image/draw: have draw.Src preserve NRGBA colors 
This reverts a behavior change introduced in Go 1.18 (commit 9f69a443;
CL 340049). In Go 1.17 and earlier, draw.Draw(etc, draw.Src) with
image.NRGBA dst and src images would pass through a (heap allocated)
color.Color interface value holding a color.NRGBA concrete value.
Threading that color.NRGBA value all the way through preserves
non-premultiplied alpha transparency information (distinguishing e.g.
transparent blue from transparent red).

CL 340049 optimized out that heap allocation (per pixel), calling new
SetRGBA64At and RGBA64At methods instead. However, these methods (like
the existing image/color Color.RGBA method) work in premultiplied alpha,
so any distinction between transparent colors is lost.

This commit re-introduces the preservation of distinct transparencies,
when dst and src are both *image.NRGBA (or both *image.NRGBA64) and the
op is draw.Src.

Fixes #51893

Change-Id: Id9c64bfeeaecc458586f169f50b99d6c8aa52a7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/396795
Trust: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2022-04-07 10:41:34 +00:00
.github .github: remove duplicate security link 2022-01-07 17:55:09 +00:00
api crypto/x509: add new CRL parser, deprecate old one 2022-04-05 23:32:55 +00:00
doc image/draw: have draw.Src preserve NRGBA colors 2022-04-07 10:41:34 +00:00
lib/time lib/time, time/tzdata: update to 2021e 2021-11-11 05:16:39 +00:00
misc cmd/cgo: retain original file paths in godefs generated comment 2022-04-03 07:18:10 +00:00
src image/draw: have draw.Src preserve NRGBA colors 2022-04-07 10:41:34 +00:00
test cmd/compile: use shlx&shrx instruction for GOAMD64>=v3 2022-04-04 20:07:23 +00:00
.gitattributes
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS copyright: add Loongson into AUTHORS 2022-04-04 17:30:33 +00:00
codereview.cfg
CONTRIBUTING.md
CONTRIBUTORS A+C: change email of Ben Shi (individual CLA) 2022-03-22 16:02:31 +00:00
LICENSE
PATENTS
README.md README.md: update links to go.dev 2022-03-20 16:05:03 +00:00
SECURITY.md

README.md

The Go Programming Language

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