Refactor ManifestIconSelector and update it for Manifest.icon.purpose

chrome/browser/manifest/manifest_icon_selector.h

 // Copyright 2015 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_MANIFEST_MANIFEST_ICON_SELECTOR_H_
 #define CHROME_BROWSER_MANIFEST_MANIFEST_ICON_SELECTOR_H_
 
 #include "base/macros.h"
 #include "content/public/common/manifest.h"
 #include "url/gurl.h"
 
-// Selects the icon most closely matching the size constraints.  This follows
-// very basic heuristics -- improvements are welcome.
+// Selects the square icon with the supported image MIME types and the specified
+// icon purpose that most closely matches the size constraints.
+// This follows very basic heuristics -- improvements are welcome.
 class ManifestIconSelector {
  public:
   // Runs the algorithm to find the best matching icon in the icons listed in
-  // the Manifest.
-  //
-  // Size is defined in pixels.
+  // the Manifest. Size is defined in pixels.
   //
   // Any icon returned will be close as possible to |ideal_icon_size_in_px|
-  // with a size not less than |minimum_icon_size_in_px|.
+  // with a size not less than |minimum_icon_size_in_px|. Additionally, it must
+  // be square, have supported image MIME types, and have icon purpose
+  // |purpose|.
   //
   // Returns the icon url if a suitable icon is found. An empty URL otherwise.
   static GURL FindBestMatchingIcon(
       const std::vector<content::Manifest::Icon>& icons,
       int ideal_icon_size_in_px,
-      int minimum_icon_size_in_px);
+      int minimum_icon_size_in_px,
+      content::Manifest::Icon::IconPurpose purpose);
 
  private:
-  ManifestIconSelector(int ideal_icon_size_in_px,
-                       int minimum_icon_size_in_px);
-  virtual ~ManifestIconSelector() {}
-
-  // Returns the square icon that is the smallest icon larger than
-  // ideal_icon_size_in_px_ (if it exists), or the largest icon smaller than
-  // ideal_icon_size_in_px_ otherwise.
-  int FindClosestIconToIdealSize(
-      const std::vector<content::Manifest::Icon>& icons) const;
-
-  // Runs the algorithm to find the best matching icon in the icons listed in
-  // the Manifest.
-  // Returns the icon url if a suitable icon is found. An empty URL otherwise.
-  int FindBestMatchingIcon(
-      const std::vector<content::Manifest::Icon>& icons) const;
-
-  // Returns whether the |preferred_icon_size_in_pixels_| is in |sizes|.
-  bool IconSizesContainsPreferredSize(
-      const std::vector<gfx::Size>& sizes) const;
-
-  // Returns whether a size bigger than |minimun_icon_size_in_pixels_| is in
-  // |sizes|.
-  bool IconSizesContainsBiggerThanMinimumSize(
-      const std::vector<gfx::Size>& sizes) const;
-
-  // Returns an array containing the items in |icons| without the unsupported
-  // image MIME types.
-  static std::vector<content::Manifest::Icon> FilterIconsByType(
-      const std::vector<content::Manifest::Icon>& icons);
-
-  // Returns whether the 'any' (ie. gfx::Size(0,0)) is in |sizes|.
-  static bool IconSizesContainsAny(const std::vector<gfx::Size>& sizes);
-
-  const int ideal_icon_size_in_px_;
-  const int minimum_icon_size_in_px_;
-
-  friend class ManifestIconSelectorTest;
-
-  DISALLOW_COPY_AND_ASSIGN(ManifestIconSelector);
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ManifestIconSelector);
 };
 
 #endif  // CHROME_BROWSER_MANIFEST_MANIFEST_ICON_SELECTOR_H_