Page Speed Optimization Libraries  1.7.30.3
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 MessageHandler;
00034 
00061 class ImageUrlEncoder : public UrlSegmentEncoder {
00062  public:
00066   static const int kSmallScreenSizeThresholdArea;
00067 
00068   ImageUrlEncoder() {}
00069   virtual ~ImageUrlEncoder();
00070 
00071   virtual void Encode(const StringVector& urls,
00072                       const ResourceContext* dim,
00073                       GoogleString* rewritten_url) const;
00074 
00075   virtual bool Decode(const StringPiece& url_segment,
00076                       StringVector* urls,
00077                       ResourceContext* dim,
00078                       MessageHandler* handler) const;
00079 
00084   static void  SetLibWebpLevel(const RequestProperties& request_properties,
00085                                ResourceContext* resource_context);
00086 
00092   static void SetWebpAndMobileUserAgent(const RewriteDriver& driver,
00093                                         ResourceContext* context);
00094 
00096   static bool IsWebpRewrittenUrl(const GoogleUrl& gurl);
00097 
00100   static void SetSmallScreen(const RewriteDriver& driver,
00101                              ResourceContext* context);
00102 
00104   static void SetUserAgentScreenResolution(
00105       RewriteDriver* driver, ResourceContext* context);
00106 
00108   static GoogleString CacheKeyFromResourceContext(
00109       const ResourceContext& resource_context);
00110 
00111   static bool HasDimensions(const ResourceContext& data) {
00112     return (data.has_desired_image_dims() &&
00113             HasValidDimensions(data.desired_image_dims()));
00114   }
00115 
00116   static bool HasValidDimensions(const ImageDim& dims) {
00117     return (dims.has_width() && dims.has_height());
00118   }
00119 
00120   static bool HasDimension(const ResourceContext& data) {
00121     return (data.has_desired_image_dims() &&
00122             HasValidDimension(data.desired_image_dims()));
00123   }
00124 
00125   static bool HasValidDimension(const ImageDim& dims) {
00126     return (dims.has_width() || dims.has_height());
00127   }
00128 
00129  private:
00130   FRIEND_TEST(ImageRewriteTest, SquashImagesForMobileScreen);
00131   FRIEND_TEST(ImageUrlEncoderTest, UserAgentScreenResolution);
00132 
00136   static bool GetNormalizedScreenResolution(
00137       int screen_width, int screen_height, int* normalized_width,
00138       int* normalized_height);
00139 
00140   DISALLOW_COPY_AND_ASSIGN(ImageUrlEncoder);
00141 };
00142 
00143 }  
00144 
00145 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_URL_ENCODER_H_
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