Page Speed Optimization Libraries
1.7.30.3
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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_