Icon Capture Utility For Linux, Windows and Mac

chrome/browser/media/window_icon_util_win.cc

+// Copyright 2016 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 "chrome/browser/media/window_icon_util.h"
+
+#include "ui/gfx/icon_util.h"
+
+gfx::ImageSkia GetWindowIcon(content::DesktopMediaID id) {
+  DCHECK(id.type == content::DesktopMediaID::TYPE_WINDOW);
+
+  HWND hwnd = reinterpret_cast<HWND>(id.id);
+
+  HICON icon_handle =
+      reinterpret_cast<HICON>(SendMessage(hwnd, WM_GETICON, ICON_BIG, 0));
+
+  if (!icon_handle)
+    icon_handle = reinterpret_cast<HICON>(GetClassLongPtr(hwnd, GCLP_HICON));
+
+  if (!icon_handle) {
+    icon_handle =
+        reinterpret_cast<HICON>(SendMessage(hwnd, WM_GETICON, ICON_SMALL, 0));
+  }
+
+  if (!icon_handle) {
+    icon_handle =
+        reinterpret_cast<HICON>(SendMessage(hwnd, WM_GETICON, ICON_SMALL2, 0));
+  }
+
+  if (!icon_handle)
+    icon_handle = reinterpret_cast<HICON>(GetClassLongPtr(hwnd, GCLP_HICONSM));
+
+  if (!icon_handle)
+    return gfx::ImageSkia();
+
+  std::unique_ptr<SkBitmap> icon_bitmap(
+      IconUtil::CreateSkBitmapFromHICON(icon_handle));
+
+  return gfx::ImageSkia::CreateFrom1xBitmap(*icon_bitmap);
+}