Page Speed Optimization Libraries
1.8.31.3
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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 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_