1 files changed, 118 insertions, 0 deletions
diff --git a/vendor/golang.org/x/image/draw/example_test.go b/vendor/golang.org/x/image/draw/example_test.go
new file mode 100644
index 000000000..bcb46629c
--- /dev/null
+++ b/vendor/golang.org/x/image/draw/example_test.go
@@ -0,0 +1,118 @@
+// Copyright 2015 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 draw_test
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"image/png"
+	"log"
+	"math"
+	"os"
+
+	"golang.org/x/image/draw"
+	"golang.org/x/image/math/f64"
+)
+
+func ExampleDraw() {
+	fSrc, err := os.Open("../testdata/blue-purple-pink.png")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer fSrc.Close()
+	src, err := png.Decode(fSrc)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	dst := image.NewRGBA(image.Rect(0, 0, 400, 300))
+	green := image.NewUniform(color.RGBA{0x00, 0x1f, 0x00, 0xff})
+	draw.Copy(dst, image.Point{}, green, dst.Bounds(), draw.Src, nil)
+	qs := []draw.Interpolator{
+		draw.NearestNeighbor,
+		draw.ApproxBiLinear,
+		draw.CatmullRom,
+	}
+	const cos60, sin60 = 0.5, 0.866025404
+	t := f64.Aff3{
+		+2 * cos60, -2 * sin60, 100,
+		+2 * sin60, +2 * cos60, 100,
+	}
+
+	draw.Copy(dst, image.Point{20, 30}, src, src.Bounds(), draw.Over, nil)
+	for i, q := range qs {
+		q.Scale(dst, image.Rect(200+10*i, 100*i, 600+10*i, 150+100*i), src, src.Bounds(), draw.Over, nil)
+	}
+	draw.NearestNeighbor.Transform(dst, t, src, src.Bounds(), draw.Over, nil)
+
+	red := image.NewNRGBA(image.Rect(0, 0, 16, 16))
+	for y := 0; y < 16; y++ {
+		for x := 0; x < 16; x++ {
+			red.SetNRGBA(x, y, color.NRGBA{
+				R: uint8(x * 0x11),
+				A: uint8(y * 0x11),
+			})
+		}
+	}
+	red.SetNRGBA(0, 0, color.NRGBA{0xff, 0xff, 0x00, 0xff})
+	red.SetNRGBA(15, 15, color.NRGBA{0xff, 0xff, 0x00, 0xff})
+
+	ops := []draw.Op{
+		draw.Over,
+		draw.Src,
+	}
+	for i, op := range ops {
+		dr := image.Rect(120+10*i, 150+60*i, 170+10*i, 200+60*i)
+		draw.NearestNeighbor.Scale(dst, dr, red, red.Bounds(), op, nil)
+		t := f64.Aff3{
+			+cos60, -sin60, float64(190 + 10*i),
+			+sin60, +cos60, float64(140 + 50*i),
+		}
+		draw.NearestNeighbor.Transform(dst, t, red, red.Bounds(), op, nil)
+	}
+
+	dr := image.Rect(0, 0, 128, 128)
+	checkerboard := image.NewAlpha(dr)
+	for y := dr.Min.Y; y < dr.Max.Y; y++ {
+		for x := dr.Min.X; x < dr.Max.X; x++ {
+			if (x/20)%2 == (y/20)%2 {
+				checkerboard.SetAlpha(x, y, color.Alpha{0xff})
+			}
+		}
+	}
+	sr := image.Rect(0, 0, 16, 16)
+	circle := image.NewAlpha(sr)
+	for y := sr.Min.Y; y < sr.Max.Y; y++ {
+		for x := sr.Min.X; x < sr.Max.X; x++ {
+			dx, dy := x-10, y-8
+			if d := 32 * math.Sqrt(float64(dx*dx)+float64(dy*dy)); d < 0xff {
+				circle.SetAlpha(x, y, color.Alpha{0xff - uint8(d)})
+			}
+		}
+	}
+	cyan := image.NewUniform(color.RGBA{0x00, 0xff, 0xff, 0xff})
+	draw.NearestNeighbor.Scale(dst, dr, cyan, sr, draw.Over, &draw.Options{
+		DstMask: checkerboard,
+		SrcMask: circle,
+	})
+
+	// Change false to true to write the resultant image to disk.
+	if false {
+		fDst, err := os.Create("out.png")
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer fDst.Close()
+		err = png.Encode(fDst, dst)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	fmt.Printf("dst has bounds %v.\n", dst.Bounds())
+	// Output:
+	// dst has bounds (0,0)-(400,300).
+}