Page Speed Optimization Libraries
1.7.30.1
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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 class RequestProperties; 00030 class RewriteDriver; 00031 class MessageHandler; 00032 00059 class ImageUrlEncoder : public UrlSegmentEncoder { 00060 public: 00064 static const int kSmallScreenSizeThresholdArea; 00065 00066 ImageUrlEncoder() {} 00067 virtual ~ImageUrlEncoder(); 00068 00069 virtual void Encode(const StringVector& urls, 00070 const ResourceContext* dim, 00071 GoogleString* rewritten_url) const; 00072 00073 virtual bool Decode(const StringPiece& url_segment, 00074 StringVector* urls, 00075 ResourceContext* dim, 00076 MessageHandler* handler) const; 00077 00082 static void SetLibWebpLevel(const RequestProperties& request_properties, 00083 ResourceContext* resource_context); 00084 00090 static void SetWebpAndMobileUserAgent(const RewriteDriver& driver, 00091 ResourceContext* context); 00092 00095 static void SetSmallScreen(const RewriteDriver& driver, 00096 ResourceContext* context); 00097 00099 static void SetUserAgentScreenResolution( 00100 RewriteDriver* driver, ResourceContext* context); 00101 00103 static GoogleString CacheKeyFromResourceContext( 00104 const ResourceContext& resource_context); 00105 00106 static bool HasDimensions(const ResourceContext& data) { 00107 return (data.has_desired_image_dims() && 00108 HasValidDimensions(data.desired_image_dims())); 00109 } 00110 00111 static bool HasValidDimensions(const ImageDim& dims) { 00112 return (dims.has_width() && dims.has_height()); 00113 } 00114 00115 static bool HasDimension(const ResourceContext& data) { 00116 return (data.has_desired_image_dims() && 00117 HasValidDimension(data.desired_image_dims())); 00118 } 00119 00120 static bool HasValidDimension(const ImageDim& dims) { 00121 return (dims.has_width() || dims.has_height()); 00122 } 00123 00124 private: 00125 FRIEND_TEST(ImageRewriteTest, SquashImagesForMobileScreen); 00126 FRIEND_TEST(ImageUrlEncoderTest, UserAgentScreenResolution); 00127 00131 static bool GetNormalizedScreenResolution( 00132 int screen_width, int screen_height, int* normalized_width, 00133 int* normalized_height); 00134 00135 DISALLOW_COPY_AND_ASSIGN(ImageUrlEncoder); 00136 }; 00137 00138 } 00139 00140 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_URL_ENCODER_H_