Start of images package and EXIF test files.

Change-Id: Ie623ddc7f6df5cbde890a7c0a47affe91780534b

pkg/images/images.go

@@ -0,0 +1,50 @@
+/*
+Copyright 2012 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package images
+
+import (
+	"image"
+	"io"
+
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
+)
+
+type DecodeOpts struct {
+	// Rotate specifies how to rotate the image.
+	// If nil, the image is rotated automatically based on EXIF metadata.
+	// If an int, Rotate is the number of degrees to rotate
+	// counter clockwise and must be one of 0, 90, -90, 180, or
+	// -180.
+	Rotate interface{}
+
+	// MaxWidgth and MaxHeight optionally specify bounds on the
+	// final image's size.
+	MaxWidth, MaxHeight int
+
+	// TODO: consider alternate options if scaled ratio doesn't
+	// match original ratio:
+	//   Crop    bool   
+	//   Stretch bool
+}
+
+// Decode decodes an image from r using the provided decoding options.
+// If opts is nil, the defaults are used.
+func Decode(r io.Reader, opts *DecodeOpts) (image.Image, error) {
+	panic("TODO(mpl): implement")
+}