image: rename image.Tiled to image.Repeated.

What package image currently provides is a larger image consisting
of many copies of a smaller image.

More generally, a tiled image could be a quilt consisting of different
smaller images (like Google Maps), or a technique to view a portion of
enormous images without requiring the whole thing in memory.

This richer construct might not ever belong in the standard library (and
is definitely out of scope for Go 1), but I would like the option for
image.Tiled to be its name.

R=r, rsc
CC=golang-dev
https://golang.org/cl/5530062

src/cmd/gofix/Makefile

@@ -20,6 +20,7 @@ GOFILES=\
 	httputil.go\
 	imagecolor.go\
 	imagenew.go\
+	imagetiled.go\
 	imageycbcr.go\
 	iocopyn.go\
 	main.go\

src/cmd/gofix/imagetiled.go

+// Copyright 2012 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.
+
+package main
+
+import (
+	"go/ast"
+)
+
+func init() {
+	register(imagetiledFix)
+}
+
+var imagetiledFix = fix{
+	"imagetiled",
+	"2012-01-10",
+	imagetiled,
+	`Rename image.Tiled to image.Repeated.
+
+http://codereview.appspot.com/5530062
+`,
+}
+
+func imagetiled(f *ast.File) bool {
+	if !imports(f, "image") {
+		return false
+	}
+
+	fixed := false
+	walk(f, func(n interface{}) {
+		s, ok := n.(*ast.SelectorExpr)
+		if !ok || !isTopName(s.X, "image") || s.Sel.String() != "Tiled" {
+			return
+		}
+		s.Sel = &ast.Ident{Name: "Repeated"}
+		fixed = true
+	})
+	return fixed
+}

src/cmd/gofix/imagetiled_test.go

+// Copyright 2012 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.
+
+package main
+
+func init() {
+	addTestCases(imagetiledTests, imagetiled)
+}
+
+var imagetiledTests = []testCase{
+	{
+		Name: "imagetiled.0",
+		In: `package main
+
+import (
+	"foo"
+	"image"
+)
+
+var (
+	_ foo.Tiled
+	_ image.RGBA
+	_ image.Tiled
+)
+`,
+		Out: `package main
+
+import (
+	"foo"
+	"image"
+)
+
+var (
+	_ foo.Tiled
+	_ image.RGBA
+	_ image.Repeated
+)
+`,
+	},
+}

src/pkg/image/names.go

@@ -51,25 +51,25 @@ func NewUniform(c color.Color) *Uniform {
 	return &Uniform{c}
 }
 
-// A Tiled is an infinite-sized Image that repeats another Image in both
-// directions. Tiled{i, p}.At(x, y) will equal i.At(x+p.X, y+p.Y) for all
+// Repeated is an infinite-sized Image that repeats another Image in both
+// directions. Repeated{i, p}.At(x, y) will equal i.At(x+p.X, y+p.Y) for all
 // points {x+p.X, y+p.Y} within i's Bounds.
-type Tiled struct {
+type Repeated struct {
 	I      Image
 	Offset Point
 }
 
-func (t *Tiled) ColorModel() color.Model {
-	return t.I.ColorModel()
+func (r *Repeated) ColorModel() color.Model {
+	return r.I.ColorModel()
 }
 
-func (t *Tiled) Bounds() Rectangle { return Rectangle{Point{-1e9, -1e9}, Point{1e9, 1e9}} }
+func (r *Repeated) Bounds() Rectangle { return Rectangle{Point{-1e9, -1e9}, Point{1e9, 1e9}} }
 
-func (t *Tiled) At(x, y int) color.Color {
-	p := Point{x, y}.Add(t.Offset).Mod(t.I.Bounds())
-	return t.I.At(p.X, p.Y)
+func (r *Repeated) At(x, y int) color.Color {
+	p := Point{x, y}.Add(r.Offset).Mod(r.I.Bounds())
+	return r.I.At(p.X, p.Y)
 }
 
-func NewTiled(i Image, offset Point) *Tiled {
-	return &Tiled{i, offset}
+func NewRepeated(i Image, offset Point) *Repeated {
+	return &Repeated{i, offset}
 }