Page Speed Optimization Libraries  1.4.26.1
net/instaweb/http/public/device_properties.h
00001 // Copyright 2012 Google Inc. All Rights Reserved.
00014 
00015 #ifndef NET_INSTAWEB_HTTP_PUBLIC_DEVICE_PROPERTIES_H_
00016 #define NET_INSTAWEB_HTTP_PUBLIC_DEVICE_PROPERTIES_H_
00017 
00018 #include "net/instaweb/util/public/basictypes.h"
00019 #include "net/instaweb/util/public/gtest_prod.h"
00020 #include "net/instaweb/util/public/string.h"
00021 #include "net/instaweb/util/public/string_util.h"
00022 
00023 namespace net_instaweb {
00024 
00025 class UserAgentMatcher;
00026 
00029 class DeviceProperties {
00030  public:
00031   explicit DeviceProperties(UserAgentMatcher* matcher);
00032   virtual ~DeviceProperties();
00033 
00034   void set_user_agent(const StringPiece& user_agent_string);
00035   bool SupportsImageInlining() const;
00036   bool SupportsLazyloadImages() const;
00037   bool SupportsCriticalImagesBeacon() const;
00038   bool SupportsJsDefer(bool enable_mobile) const;
00039   bool SupportsWebp() const;
00040   bool SupportsWebpLosslessAlpha() const;
00041   bool IsBot() const;
00042   bool IsMobileUserAgent() const;
00043   bool SupportsSplitHtml(bool enable_mobile) const;
00044   bool CanPreloadResources() const;
00045   bool GetScreenResolution(int* width, int* height) const;
00046 
00047  private:
00048   friend class ImageRewriteTest;
00049   FRIEND_TEST(ImageRewriteTest, SquashImagesForMobileScreen);
00050   void SetScreenResolution(int width, int height) const;
00051 
00052   GoogleString user_agent_;
00053   UserAgentMatcher* ua_matcher_;
00054 
00055   mutable LazyBool supports_image_inlining_;
00056   mutable LazyBool supports_js_defer_;
00057   mutable LazyBool supports_lazyload_images_;
00058   mutable LazyBool supports_webp_;
00059   mutable LazyBool supports_webp_lossless_alpha_;
00060   mutable LazyBool is_bot_;
00061   mutable LazyBool is_mobile_user_agent_;
00062   mutable LazyBool supports_split_html_;
00063   mutable LazyBool supports_flush_early_;
00064   mutable LazyBool screen_dimensions_set_;
00065   mutable int screen_width_;
00066   mutable int screen_height_;
00067 
00068   DISALLOW_COPY_AND_ASSIGN(DeviceProperties);
00069 };
00070 
00071 }  
00072 
00073 #endif  ///< NET_INSTAWEB_HTTP_PUBLIC_DEVICE_PROPERTIES_H_
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