Page Speed Optimization Libraries  1.7.30.3
net/instaweb/spriter/image_library_interface.h
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00001 /*
00002  * Copyright 2011 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_SPRITER_IMAGE_LIBRARY_INTERFACE_H_
00020 #define NET_INSTAWEB_SPRITER_IMAGE_LIBRARY_INTERFACE_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/string.h"
00024 #include "net/instaweb/spriter/public/image_spriter.pb.h"
00025 
00028 
00029 namespace net_instaweb {
00030 namespace spriter {
00031 
00040 
00041 class ImageLibraryInterface {
00042  public:
00045   typedef GoogleString FilePath;
00046 
00049   class Delegate {
00050    public:
00051     virtual void OnError(const GoogleString& error) const = 0;
00052     virtual ~Delegate() {}
00053   };
00054 
00056   class Image {
00057    public:
00059     virtual bool GetDimensions(int* out_width, int* out_height) const = 0;
00060     virtual ~Image() {}
00061    protected:
00063     explicit Image(ImageLibraryInterface* lib) : lib_(lib) {}
00064     ImageLibraryInterface* lib_;
00065    private:
00066     DISALLOW_COPY_AND_ASSIGN(Image);
00067   };
00068 
00071   virtual Image* ReadFromFile(const FilePath& path) = 0;
00072 
00076   class Canvas {
00077    public:
00078     virtual bool DrawImage(const Image* image, int x, int y) = 0;
00079     virtual bool WriteToFile(
00080         const FilePath& write_path, ImageFormat format) = 0;
00081     virtual ~Canvas() {}
00082    protected:
00083     explicit Canvas(ImageLibraryInterface* lib) : lib_(lib) {}
00084     ImageLibraryInterface* lib_;
00085    private:
00086     DISALLOW_COPY_AND_ASSIGN(Canvas);
00087   };
00088 
00089   virtual Canvas* CreateCanvas(int width, int height) = 0;
00090 
00093   ImageLibraryInterface(Delegate* delegate)
00094       : delegate_(delegate) {
00095   }
00096 
00097   virtual ~ImageLibraryInterface() {}
00098 
00100   static ImageLibraryInterface* ImageLibraryInterfaceFactory(
00101       const GoogleString& library_name);
00102 
00103  protected:
00105   ImageLibraryInterface(const FilePath& base_input_path,
00106                         const FilePath& base_output_path,
00107                         Delegate* delegate);
00108 
00110   const FilePath& base_input_path() { return base_input_path_; }
00111   const FilePath& base_output_path() { return base_output_path_; }
00112   const Delegate* delegate() { return delegate_; }
00113 
00114  private:
00117   FilePath base_input_path_;
00118 
00121   FilePath base_output_path_;
00122 
00125   const Delegate* delegate_;
00126 
00127   DISALLOW_COPY_AND_ASSIGN(ImageLibraryInterface);
00128 };
00129 
00130 }  
00131 }  
00132 
00133 #endif  ///< NET_INSTAWEB_SPRITER_IMAGE_LIBRARY_INTERFACE_H_
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