content/child/image_decoder.h

   1 // Copyright (c) 2013 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 #include <vector>
   6
   7 #include "base/basictypes.h"
   8 #include "ui/gfx/size.h"
   9
  10 class SkBitmap;
  11
  12 namespace content {
  13
  14 // Provides an interface to WebKit's image decoders.
  15 //
  16 // Note to future: This class should be deleted. We should have our own nice
  17 // image decoders in base/gfx, and our port should use those. Currently, it's
  18 // the other way around.
  19 class ImageDecoder {
  20  public:
  21   // Use the constructor with desired_size when you think you may have an .ico
  22   // format and care about which size you get back. Otherwise, use the 0-arg
  23   // constructor.
  24   ImageDecoder();
  25   ImageDecoder(const gfx::Size& desired_icon_size);
  26   ~ImageDecoder();
  27
  28   // Call this function to decode the image. If successful, the decoded image
  29   // will be returned. Otherwise, an empty bitmap will be returned.
  30   SkBitmap Decode(const unsigned char* data, size_t size) const;
  31
  32   // Returns all frames found in the image represented by data. If there are
  33   // multiple frames at the same size, only the first one is returned.
  34   static std::vector<SkBitmap> DecodeAll(
  35       const unsigned char* data, size_t size);
  36
  37  private:
  38   // Size will be empty to get the largest possible size.
  39   gfx::Size desired_icon_size_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
  42 };
  43
  44 }  // namespace content