Add appliedOrientation obj to metadata

Author: happycollision

lib/index.d.ts

@@ -1119,6 +1119,13 @@ declare namespace sharp {
         width?: number | undefined;
         /** Number of pixels high (EXIF orientation is not taken into consideration) */
         height?: number | undefined;
+        /** Any changed metadata after the image orientation is applied. */
+        appliedOrientation: {
+            /** Number of pixels wide (EXIF orientation is taken into consideration) */
+            width: number;
+            /** Number of pixels high (EXIF orientation is taken into consideration) */
+            height: number;
+        };
         /** Name of colour space interpretation */
         space?: keyof ColourspaceEnum | undefined;
         /** Number of bands e.g. 3 for sRGB, 4 for CMYK */

lib/input.js

@@ -486,13 +486,11 @@ function _isStreamInput () {
  * @example
  * // Based on EXIF rotation metadata, get the right-side-up width and height:
  *
- * const size = getNormalSize(await sharp(input).metadata());
+ * const metadata = await sharp(input).metadata()
  *
- * function getNormalSize({ width, height, orientation }) {
- *   return (orientation || 0) >= 5
- *     ? { width: height, height: width }
- *     : { width, height };
- * }
+ * // These will match metadata.width and metadata.height, but with EXIF
+ * // orientation applied if necessary.
+ * const {width, height} = metadata.appliedOrientation
  *
  * @param {Function} [callback] - called with the arguments `(err, metadata)`
  * @returns {Promise<Object>|Sharp}

src/metadata.cc

@@ -242,6 +242,15 @@ class MetadataWorker : public Napi::AsyncWorker {
       if (baton->orientation > 0) {
         info.Set("orientation", baton->orientation);
       }
+      Napi::Object appliedOrientation = Napi::Object::New(env);
+      info.Set("appliedOrientation", appliedOrientation);
+      if (baton->orientation >= 5) {
+        appliedOrientation.Set("width", baton->height);
+        appliedOrientation.Set("height", baton->width);
+      } else {
+        appliedOrientation.Set("width", baton->width);
+        appliedOrientation.Set("height", baton->height);
+      }
       if (baton->exifLength > 0) {
         info.Set("exif", Napi::Buffer<char>::NewOrCopy(env, baton->exif, baton->exifLength, sharp::FreeCallback));
       }

test/unit/metadata.js

@@ -102,6 +102,8 @@ describe('Image metadata', function () {
       assert.strictEqual(false, metadata.hasProfile);
       assert.strictEqual(false, metadata.hasAlpha);
       assert.strictEqual(1, metadata.orientation);
+      assert.strictEqual(2464, metadata.appliedOrientation.width);
+      assert.strictEqual(3248, metadata.appliedOrientation.height);
       assert.strictEqual('undefined', typeof metadata.exif);
       assert.strictEqual('undefined', typeof metadata.icc);
       assert.strictEqual('inch', metadata.resolutionUnit);
@@ -148,6 +150,8 @@ describe('Image metadata', function () {
       assert.strictEqual(false, metadata.hasProfile);
       assert.strictEqual(false, metadata.hasAlpha);
       assert.strictEqual('undefined', typeof metadata.orientation);
+      assert.strictEqual(2809, metadata.appliedOrientation.width);
+      assert.strictEqual(2074, metadata.appliedOrientation.height);
       assert.strictEqual('undefined', typeof metadata.exif);
       assert.strictEqual('undefined', typeof metadata.icc);
       done();
@@ -218,7 +222,11 @@ describe('Image metadata', function () {
       isPalette: false,
       isProgressive: false,
       space: 'b-w',
-      width: 32
+      width: 32,
+      appliedOrientation: {
+        width: 32,
+        height: 32
+      }
     });
   });
 
@@ -239,7 +247,11 @@ describe('Image metadata', function () {
       isPalette: false,
       isProgressive: false,
       space: 'grey16',
-      width: 32
+      width: 32,
+      appliedOrientation: {
+        width: 32,
+        height: 32
+      }
     });
   });
 
@@ -601,6 +613,10 @@ describe('Image metadata', function () {
           if (err) throw err;
           assert.strictEqual(true, metadata.hasProfile);
           assert.strictEqual(8, metadata.orientation);
+          assert.strictEqual(320, metadata.width);
+          assert.strictEqual(240, metadata.height);
+          assert.strictEqual(240, metadata.appliedOrientation.width);
+          assert.strictEqual(320, metadata.appliedOrientation.height);
           assert.strictEqual('object', typeof metadata.exif);
           assert.strictEqual(true, metadata.exif instanceof Buffer);
           // EXIF
@@ -926,7 +942,11 @@ describe('Image metadata', function () {
       pagePrimary: 0,
       compression: 'av1',
       hasProfile: false,
-      hasAlpha: false
+      hasAlpha: false,
+      appliedOrientation: {
+        width: 2048,
+        height: 858
+      }
     });
   });