Implement a JavaScript API for document scanning

chrome/common/extensions/api/document_scan.idl

Index: chrome/common/extensions/api/document_scan.idl
diff --git a/chrome/common/extensions/api/document_scan.idl b/chrome/common/extensions/api/document_scan.idl
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+// 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 an 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;
+  };
+
+  dictionary ScanOptions {
+    // The mode to perform the scan in: color, gray or lineart.
+    DOMString? 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.
+  callback ScanCallback = void (boolean result, 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, ths image data will be stored in
+    // the user's download folder, and 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);
+  };
+};