Support PNG and quality control in chrome.tabs.captureVisibleTab().

chrome/browser/extensions/extension_tabs_module.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__
 
 #include <string>
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/common/notification_service.h"
@@ skipping 122 matching lines @@
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
   void GotLanguage(const std::string& language);
   NotificationRegistrar registrar_;
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.detectLanguage")
 };
 class CaptureVisibleTabFunction : public AsyncExtensionFunction,
                                   public NotificationObserver {
  private:
+  enum ImageFormat {
+    FORMAT_JPEG,
+    FORMAT_PNG
+  };
+
+  // The default quality setting used when encoding jpegs.
+  static const int kDefaultQuality;
+
   ~CaptureVisibleTabFunction() {}
   virtual bool RunImpl();
   virtual bool CaptureSnapshotFromBackingStore(BackingStore* backing_store);
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
   virtual void SendResultFromBitmap(const SkBitmap& screen_capture);
 
   NotificationRegistrar registrar_;
 
+  // The format (JPEG vs PNG) of the resulting image.  Set in RunImpl().
+  ImageFormat image_format_;
+
+  // Quality setting to use when encoding jpegs.  Set in RunImpl().
+  int image_quality_;
+
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.captureVisibleTab")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__