PLT-173 Added graphics-go and goexif libraries for image manipulation

1 files changed, 41 insertions, 0 deletions

diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail.go
new file mode 100644
index 000000000..d3ad7e8f7
--- /dev/null
+++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail.go
@@ -0,0 +1,41 @@
+// Copyright 2011 The Graphics-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 graphics
+
+import (
+	"image"
+	"image/draw"
+)
+
+// Thumbnail scales and crops src so it fits in dst.
+func Thumbnail(dst draw.Image, src image.Image) error {
+	// Scale down src in the dimension that is closer to dst.
+	sb := src.Bounds()
+	db := dst.Bounds()
+	rx := float64(sb.Dx()) / float64(db.Dx())
+	ry := float64(sb.Dy()) / float64(db.Dy())
+	var b image.Rectangle
+	if rx < ry {
+		b = image.Rect(0, 0, db.Dx(), int(float64(sb.Dy())/rx))
+	} else {
+		b = image.Rect(0, 0, int(float64(sb.Dx())/ry), db.Dy())
+	}
+
+	buf := image.NewRGBA(b)
+	if err := Scale(buf, src); err != nil {
+		return err
+	}
+
+	// Crop.
+	// TODO(crawshaw): improve on center-alignment.
+	var pt image.Point
+	if rx < ry {
+		pt.Y = (b.Dy() - db.Dy()) / 2
+	} else {
+		pt.X = (b.Dx() - db.Dx()) / 2
+	}
+	draw.Draw(dst, db, buf, pt, draw.Src)
+	return nil
+}