chrome/browser/favicon/favicon_util.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_FAVICON_FAVICON_UTIL_H_
   6 #define CHROME_BROWSER_FAVICON_FAVICON_UTIL_H_
   7
   8 #include "ui/base/layout.h"
   9
  10 class GURL;
  11
  12 namespace content {
  13 class RenderViewHost;
  14 }
  15
  16 namespace gfx {
  17 class Image;
  18 }
  19
  20 namespace history {
  21 struct FaviconBitmapResult;
  22 }
  23
  24 // Utility class for common favicon related code.
  25 class FaviconUtil {
  26  public:
  27   // Returns the scale factors at which favicons should be fetched. This is
  28   // different from ui::GetSupportedScaleFactors() because clients which do
  29   // not support 1x should still fetch a favicon for 1x to push to sync. This
  30   // guarantees that the clients receiving sync updates pushed by this client
  31   // receive a favicon (potentially of the wrong scale factor) and do not show
  32   // the default favicon.
  33   static std::vector<ui::ScaleFactor> GetFaviconScaleFactors();
  34
  35   // Takes a vector of png-encoded frames, decodes them, and converts them to
  36   // a favicon of size favicon_size (in DIPs) at the desired ui scale factors.
  37   static gfx::Image SelectFaviconFramesFromPNGs(
  38       const std::vector<history::FaviconBitmapResult>& png_data,
  39       const std::vector<ui::ScaleFactor>& scale_factors,
  40       int favicon_size);
  41
  42   // Takes a vector of bitmaps and returns the index of the image that will best
  43   // produce an image of size |desired_size| for the given |scale_factors|.
  44   static size_t SelectBestFaviconFromBitmaps(
  45       const std::vector<SkBitmap>& bitmaps,
  46       const std::vector<ui::ScaleFactor>& scale_factors,
  47       int desired_size);
  48 };
  49
  50 #endif  // CHROME_BROWSER_FAVICON_FAVICON_UTIL_H_