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      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 UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
      6 #define UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/strings/string_piece.h"
     10 #include "ui/base/layout.h"
     11 #include "ui/base/ui_export.h"
     12 
     13 namespace base {
     14 class RefCountedStaticMemory;
     15 }
     16 
     17 namespace ui {
     18 
     19 class UI_EXPORT ResourceHandle {
     20  public:
     21   // What type of encoding the text resources use.
     22   enum TextEncodingType {
     23     BINARY,
     24     UTF8,
     25     UTF16
     26   };
     27 
     28   virtual ~ResourceHandle() {}
     29 
     30   // Returns true if the DataPack contains a resource with id |resource_id|.
     31   virtual bool HasResource(uint16 resource_id) const = 0;
     32 
     33   // Get resource by id |resource_id|, filling in |data|.
     34   // The data is owned by the DataPack object and should not be modified.
     35   // Returns false if the resource id isn't found.
     36   virtual bool GetStringPiece(uint16 resource_id,
     37                               base::StringPiece* data) const = 0;
     38 
     39   // Like GetStringPiece(), but returns a reference to memory.
     40   // Caller owns the returned object.
     41   virtual base::RefCountedStaticMemory* GetStaticMemory(
     42       uint16 resource_id) const = 0;
     43 
     44   // Get the encoding type of text resources.
     45   virtual TextEncodingType GetTextEncodingType() const = 0;
     46 
     47   // The scale of images in this resource pack relative to images in the 1x
     48   // resource pak.
     49   virtual ScaleFactor GetScaleFactor() const = 0;
     50 };
     51 
     52 }  // namespace ui
     53 
     54 #endif  // UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
     55