Implement a JavaScript API for document scanning

chrome/browser/extensions/api/document_scan/document_scan_interface.h

Index: chrome/browser/extensions/api/document_scan/document_scan_interface.h
diff --git a/chrome/browser/extensions/api/document_scan/document_scan_interface.h b/chrome/browser/extensions/api/document_scan/document_scan_interface.h
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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.
+
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_DOCUMENT_SCAN_DOCUMENT_SCAN_INTERFACE_H_
+#define CHROME_BROWSER_EXTENSIONS_API_DOCUMENT_SCAN_DOCUMENT_SCAN_INTERFACE_H_
+
+namespace extensions {
+
+namespace api {
+
+class DocumentScanInterface {
+ public:
+  struct ScannerDescription {
+    std::string name;
+    std::string manufacturer;
+    std::string model;
+    std::string scanner_type;
+    std::string image_mime_type;
+  };
+
+  enum ScanMode {
+    kScanModeColor,
+    kScanModeGray,
+    kScanModeLineart
+  };
+
+  typedef base::Callback<void(
+      const std::vector<ScannerDescription>& scanner_descriptions,
+      const std::string& error)> ListScannersResultsCallback;
+
+  typedef base::Callback<void(
+      const std::string& scanned_image,
+      const std::string& error)> ScanResultsCallback;
+
+  virtual ~DocumentScanInterface() {}
+
+  virtual void Scan(const std::string& scanner_name,
+                    ScanMode mode,
+                    int resolution_dpi,
+                    const ScanResultsCallback& callback) = 0;
+  virtual void ListScanners(const ListScannersResultsCallback& callback) = 0;
+  virtual std::string GetImageMimeType() const = 0;
+
+  // Creates a platform-specific DocumentScanInterface instance.
+  static DocumentScanInterface *CreateInstance();
+
+ protected:
+  DocumentScanInterface() {}
+};
+
+}  // namespace api
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_DOCUMENT_SCAN_DOCUMENT_SCAN_INTERFACE_H_