Page Speed Optimization Libraries  1.3.25.1
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 class DeviceProperties;
00030 class RewriteDriver;
00031 class MessageHandler;
00032 
00059 class ImageUrlEncoder : public UrlSegmentEncoder {
00060  public:
00061   ImageUrlEncoder() {}
00062   virtual ~ImageUrlEncoder();
00063 
00064   virtual void Encode(const StringVector& urls,
00065                       const ResourceContext* dim,
00066                       GoogleString* rewritten_url) const;
00067 
00068   virtual bool Decode(const StringPiece& url_segment,
00069                       StringVector* urls,
00070                       ResourceContext* dim,
00071                       MessageHandler* handler) const;
00072 
00077   static void  SetLibWebpLevel(const DeviceProperties& device_properties,
00078                                ResourceContext* resource_context);
00079 
00085   static void SetWebpAndMobileUserAgent(const RewriteDriver& driver,
00086                                         ResourceContext* context);
00087 
00089   static void SetUserAgentScreenResolution(
00090       RewriteDriver* driver, ResourceContext* context);
00091 
00093   static GoogleString CacheKeyFromResourceContext(
00094       const ResourceContext& resource_context);
00095 
00096   static bool HasDimensions(const ResourceContext& data) {
00097     return (data.has_desired_image_dims() &&
00098             HasValidDimensions(data.desired_image_dims()));
00099   }
00100 
00101   static bool HasValidDimensions(const ImageDim& dims) {
00102     return (dims.has_width() && dims.has_height());
00103   }
00104 
00105   static bool HasDimension(const ResourceContext& data) {
00106     return (data.has_desired_image_dims() &&
00107             HasValidDimension(data.desired_image_dims()));
00108   }
00109 
00110   static bool HasValidDimension(const ImageDim& dims) {
00111     return (dims.has_width() || dims.has_height());
00112   }
00113 
00114  private:
00115   FRIEND_TEST(ImageRewriteTest, SquashImagesForMobileScreen);
00116   FRIEND_TEST(ImageUrlEncoderTest, UserAgentScreenResolution);
00117 
00121   static bool GetNormalizedScreenResolution(
00122       int screen_width, int screen_height, int* normalized_width,
00123       int* normalized_height);
00124 
00125   DISALLOW_COPY_AND_ASSIGN(ImageUrlEncoder);
00126 };
00127 
00128 }  
00129 
00130 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_URL_ENCODER_H_
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