Page Speed Optimization Libraries  1.7.30.4
net/instaweb/rewriter/public/image_url_encoder.h
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00001 /*
00002  * Copyright 2010 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  */
00017 
00018 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_URL_ENCODER_H_
00019 #define NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_URL_ENCODER_H_
00020 
00021 #include "net/instaweb/rewriter/cached_result.pb.h"
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/gtest_prod.h"
00024 #include "net/instaweb/util/public/string.h"
00025 #include "net/instaweb/util/public/string_util.h"
00026 #include "net/instaweb/util/public/url_segment_encoder.h"
00027 
00028 namespace net_instaweb {
00029 
00030 class GoogleUrl;
00031 class RequestProperties;
00032 class RewriteDriver;
00033 class RewriteOptions;
00034 class MessageHandler;
00035 
00062 class ImageUrlEncoder : public UrlSegmentEncoder {
00063  public:
00067   static const int kSmallScreenSizeThresholdArea;
00068 
00069   ImageUrlEncoder() {}
00070   virtual ~ImageUrlEncoder();
00071 
00072   virtual void Encode(const StringVector& urls,
00073                       const ResourceContext* dim,
00074                       GoogleString* rewritten_url) const;
00075 
00076   virtual bool Decode(const StringPiece& url_segment,
00077                       StringVector* urls,
00078                       ResourceContext* dim,
00079                       MessageHandler* handler) const;
00080 
00085   static void SetLibWebpLevel(const RewriteOptions& options,
00086                               const RequestProperties& request_properties,
00087                               ResourceContext* resource_context);
00088 
00094   static void SetWebpAndMobileUserAgent(const RewriteDriver& driver,
00095                                         ResourceContext* context);
00096 
00098   static bool IsWebpRewrittenUrl(const GoogleUrl& gurl);
00099 
00102   static void SetSmallScreen(const RewriteDriver& driver,
00103                              ResourceContext* context);
00104 
00106   static void SetUserAgentScreenResolution(
00107       RewriteDriver* driver, ResourceContext* context);
00108 
00110   static GoogleString CacheKeyFromResourceContext(
00111       const ResourceContext& resource_context);
00112 
00113   static bool HasDimensions(const ResourceContext& data) {
00114     return (data.has_desired_image_dims() &&
00115             HasValidDimensions(data.desired_image_dims()));
00116   }
00117 
00118   static bool HasValidDimensions(const ImageDim& dims) {
00119     return (dims.has_width() && dims.has_height());
00120   }
00121 
00122   static bool HasDimension(const ResourceContext& data) {
00123     return (data.has_desired_image_dims() &&
00124             HasValidDimension(data.desired_image_dims()));
00125   }
00126 
00127   static bool HasValidDimension(const ImageDim& dims) {
00128     return (dims.has_width() || dims.has_height());
00129   }
00130 
00131  private:
00132   FRIEND_TEST(ImageRewriteTest, SquashImagesForMobileScreen);
00133   FRIEND_TEST(ImageUrlEncoderTest, UserAgentScreenResolution);
00134 
00138   static bool GetNormalizedScreenResolution(
00139       int screen_width, int screen_height, int* normalized_width,
00140       int* normalized_height);
00141 
00142   DISALLOW_COPY_AND_ASSIGN(ImageUrlEncoder);
00143 };
00144 
00145 }  
00146 
00147 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_URL_ENCODER_H_
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