draw: alias the stdlib draw.RGBA64Image type
The stdlib type is new in Go 1.17 (CL 311129).
Change-Id: If5981c39f6c31cdf785576f9373db5661c99753c
Reviewed-on: https://go-review.googlesource.com/c/image/+/330489
Trust: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/draw/draw_go117.go b/draw/draw_go117.go
new file mode 100644
index 0000000..fa83648
--- /dev/null
+++ b/draw/draw_go117.go
@@ -0,0 +1,27 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.17
+// +build go1.17
+
+package draw
+
+import (
+ "image/draw"
+)
+
+// The package documentation, in draw.go, gives the intent of this package:
+//
+// This package is a superset of and a drop-in replacement for the
+// image/draw package in the standard library.
+//
+// "Drop-in replacement" means that we use type aliases in this file.
+//
+// TODO: move the type aliases to draw.go once Go 1.16 is no longer supported.
+
+// RGBA64Image extends both the Image and image.RGBA64Image interfaces with a
+// SetRGBA64 method to change a single pixel. SetRGBA64 is equivalent to
+// calling Set, but it can avoid allocations from converting concrete color
+// types to the color.Color interface type.
+type RGBA64Image = draw.RGBA64Image
