Adding Image Orientation from Exif

.gitignore

@@ -6,3 +6,6 @@ coverage/
 
 # Misc.
 .DS_Store
+
+# VS Code
+.vscode/

README.md

@@ -37,6 +37,13 @@ returns it as an `int`.
 Retrieves '[Exif.Photo.PixelYDimension][exiv2-tags]' from the EXIF IFD and
 returns it as an `int`.
 
+##### `Orientation`
+
+###### Description
+Retrieves '[Exif.Photo.Orientation][exiv2-tags]' from the EXIF IFD and
+returns it as an `int`. (Values from 1 to 8)
+
+
 ##### `DateTaken`
 
 ###### Description

src/meta-data/definitions.js

@@ -21,6 +21,13 @@ const definitions = {
     tagType: 2,
     ifd: 'exif',
     parse: parseExifDate
+  },
+
+  Orientation: {
+    tagId: 0x0112,
+    tagType: 3,
+    ifd: '0',
+    parse: parseInt
   }
 };
 

src/meta-data/exifValues.js

@@ -0,0 +1,28 @@
+'use strict';
+
+const EXIF_ORIENTATION = {
+    ROTATE_0: {
+        value: 1
+    },
+    ROTATE_0_SYMETRIC: {
+        value: 2
+    },
+    ROTATE_180: {
+        value: 3
+    },
+    ROTATE_180_SYMETRIC: {
+        value: 4
+    },
+    ROTATE_270_SYMETRIC: {
+        value: 5
+    },
+    ROTATE_270: {
+        value: 6
+    },
+    ROTATE_90_SYMETRIC: {
+        value: 7
+    },
+    ROTATE_90: {
+        value: 8
+    }
+}

tests/index.test.js

@@ -5,6 +5,8 @@ const path = require('path'),
   moment = require('moment');
 
 const cr2Raw = require('../');
+const metaData = require('../src/meta-data');
+const exifValues = require('../src/meta-data/exifValues');
 
 test('extract preview image from _MG_4122.CR2', () => {
 
@@ -171,6 +173,28 @@ test('fetch date taken from _MG_8367.CR2', () => {
   expect(result).toEqual(dateTaken.toDate());
 });
 
+test('fetch orientation taken from _MG_8367.CR2', () => {
+
+const orientationTaken = exifValues.EXIF_ORIENTATION.ROTATE_0;
+  const cr2Path = path.resolve(__dirname, 'res', '_MG_8367.CR2');
+
+  const raw = cr2Raw(cr2Path);
+  const result = raw.fetchMeta(cr2Raw.meta.Orientation);
+
+  expect(result).toEqual(orientationTaken);
+});
+
+test('fetch orientation taken from _MG_0081.CR2', () => {
+
+  const orientationTaken = exifValues.EXIF_ORIENTATION.ROTATE_90;
+  const cr2Path = path.resolve(__dirname, 'res', '_MG_0081.CR2');
+
+  const raw = cr2Raw(cr2Path);
+  const result = raw.fetchMeta(cr2Raw.meta.Orientation);
+
+  expect(result).toEqual(orientationTaken);
+});
+
 test('extract preview image from notraw.jpg', () => {
 
   const cr2Path = path.resolve(__dirname, 'res', 'notraw.jpg');

tests/meta-data/definitions.test.js

@@ -43,3 +43,17 @@ test('defines DateTaken', () => {
   expect(actual.tagType).toBe(tagType);
   expect(actual.ifd).toBe(ifd);
 });
+
+test('defines Orientation', () => {
+
+  const tagId = 0x0112;
+  const tagType = 3;
+  const ifd = '0';
+
+  const actual = definitions.Orientation;
+
+  expect(actual).toBeDefined();
+  expect(actual.tagId).toBe(tagId);
+  expect(actual.tagType).toBe(tagType);
+  expect(actual.ifd).toBe(ifd);
+});

tests/meta-data/index.test.js

@@ -3,6 +3,7 @@
 const moment = require('moment');
 
 const metaData = require('../../src/meta-data');
+const { Orientation } = require('../../src/meta-data/definitions');
 
 test('fetch fail, no ifd', () => {
 
@@ -207,3 +208,19 @@ test('fetch height', () => {
 
   expect(actual).toBe(testHeight);
 });
+
+test('fetch orientation', () => {
+
+  const testOrientation = 1;
+  const testRaw = {
+    ifds: {
+      '0': {
+        0x0112: {
+          tagValue: 1
+        }
+      }
+    }
+  };
+  const actual = metaData.fetch(testRaw, metaData.definitions.Orientation);
+  expect(actual).toBe(testOrientation);
+});