Implement a JavaScript API for document scanning

chrome/common/extensions/api/document_scan.idl

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Use the <code>chrome.document_scan</code> API to discover and retrieve
+// images from attached paper document scanners.
+namespace documentScan {
+
+  // Represents a document scanner's properties.
+  dictionary ScannerInfo {
+    // The name of a connected scanner.
+    DOMString name;
+
+    // The manufacturer name of the scanner.
+    DOMString manufacturer;
+
+    // The model name of the scanner.
+    DOMString model;
+
+    // The type of scanner.
+    DOMString type;
+  };
+
+  // Mode to perform the scan in.
+  enum ScanMode { color, gray, lineart };
+
+  dictionary ScanOptions {
+    // The mode to perform the scan in: color, gray or lineart.
+    ScanMode? mode;
+
+    // The resolution in dpi to perform the scan.
+    long? resolutionDpi;
+  };
+
+  // Callback from the <code>listScanners</code> method.
+  callback ListScannersCallback = void (ScannerInfo[] scannerInfos);
+
+  // Callback from the <code>scan</code> method; on success (result == true)
+  // PNG image data from the scan is returned in |image_data|.  The image
+  // is also saved to the user's download folder.

[mef, 2014/05/23 18:38:18]

Is saving to download folder specific to ChromeOS?

[Paul Stewart, 2014/05/23 19:45:36]

You just found a vestige!  Patch set 6 removes that old verbiage.

+  callback ScanCallback = void (ArrayBuffer image_data);
+
+  interface Functions {
+    // Returns information about available scanners on the system.
+    // The list is regenerated each time this method is called.
+    // |callback| : Called with the list of <code>ScannerInfo</code> objects.
+    static void listScanners(ListScannersCallback callback);
+
+    // Performs a document scan.  On success, the PNG data will also be
+    // sent to the callback.
+    // |scanner| : Name of the scanner to acquire an image from.
+    // |options| : <code>ScanObject</code> object containing scan parameters.
+    // |callback| : Called with the result and data from the scan.
+    static void scan(DOMString scanner, ScanOptions options,
+                     ScanCallback callback);
+  };
+};