Page Speed Optimization Libraries
1.7.30.2
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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 */ 00016 00018 00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_REWRITE_FILTER_H_ 00020 #define NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_REWRITE_FILTER_H_ 00021 00022 #include "net/instaweb/htmlparse/public/html_element.h" 00023 #include "net/instaweb/rewriter/image_types.pb.h" 00024 #include "net/instaweb/rewriter/public/image.h" 00025 #include "net/instaweb/rewriter/public/image_url_encoder.h" 00026 #include "net/instaweb/rewriter/public/resource.h" 00027 #include "net/instaweb/rewriter/public/server_context.h" 00028 #include "net/instaweb/rewriter/public/resource_slot.h" 00029 #include "net/instaweb/rewriter/public/rewrite_filter.h" 00030 #include "net/instaweb/rewriter/public/rewrite_options.h" 00031 #include "net/instaweb/rewriter/public/rewrite_result.h" 00032 #include "net/instaweb/util/public/basictypes.h" 00033 #include "net/instaweb/util/public/scoped_ptr.h" 00034 #include "net/instaweb/util/public/string.h" 00035 #include "net/instaweb/util/public/string_util.h" 00036 00037 namespace net_instaweb { 00038 00039 class CachedResult; 00040 class ImageDim; 00041 class Histogram; 00042 class ResourceContext; 00043 class RewriteContext; 00044 class RewriteDriver; 00045 class Statistics; 00046 class TimedVariable; 00047 class UrlSegmentEncoder; 00048 class Variable; 00049 class WorkBound; 00050 struct ContentType; 00051 00055 class ImageRewriteFilter : public RewriteFilter { 00056 public: 00058 static const char kImageNoRewritesHighResolution[]; 00059 static const char kImageOngoingRewrites[]; 00060 static const char kImageResizedUsingRenderedDimensions[]; 00061 static const char kImageRewriteLatencyFailedMs[]; 00062 static const char kImageRewriteLatencyOkMs[]; 00063 static const char kImageRewritesDroppedDecodeFailure[]; 00064 static const char kImageRewritesDroppedDueToLoad[]; 00065 static const char kImageRewritesDroppedMIMETypeUnknown[]; 00066 static const char kImageRewritesDroppedNoSavingNoResize[]; 00067 static const char kImageRewritesDroppedNoSavingResize[]; 00068 static const char kImageRewritesDroppedServerWriteFail[]; 00069 static const char kImageRewritesSquashingForMobileScreen[]; 00070 static const char kImageRewrites[]; 00071 static const char kImageWebpRewrites[]; 00072 static const char kImageWebpFromGifFailureMs[]; 00073 static const char kImageWebpFromGifSuccessMs[]; 00074 static const char kImageWebpFromGifTimeouts[]; 00075 static const char kImageWebpFromJpegFailureMs[]; 00076 static const char kImageWebpFromJpegSuccessMs[]; 00077 static const char kImageWebpFromJpegTimeouts[]; 00078 static const char kImageWebpFromPngFailureMs[]; 00079 static const char kImageWebpFromPngSuccessMs[]; 00080 static const char kImageWebpFromPngTimeouts[]; 00081 static const char kImageWebpOpaqueFailureMs[]; 00082 static const char kImageWebpOpaqueSuccessMs[]; 00083 static const char kImageWebpOpaqueTimeouts[]; 00084 static const char kImageWebpWithAlphaFailureMs[]; 00085 static const char kImageWebpWithAlphaSuccessMs[]; 00086 static const char kImageWebpWithAlphaTimeouts[]; 00087 00091 static const char kInlinableImageUrlsPropertyName[]; 00092 00093 static const RewriteOptions::Filter kRelatedFilters[]; 00094 static const int kRelatedFiltersSize; 00095 00096 explicit ImageRewriteFilter(RewriteDriver* driver); 00097 virtual ~ImageRewriteFilter(); 00098 static void InitStats(Statistics* statistics); 00099 static void Initialize(); 00100 static void Terminate(); 00101 static void AddRelatedOptions(StringPieceVector* target); 00102 virtual void StartDocumentImpl(); 00103 virtual void StartElementImpl(HtmlElement* element) {} 00104 virtual void EndElementImpl(HtmlElement* element); 00105 virtual const char* Name() const { return "ImageRewrite"; } 00106 virtual const char* id() const { return RewriteOptions::kImageCompressionId; } 00107 virtual void EncodeUserAgentIntoResourceContext( 00108 ResourceContext* context) const; 00109 00112 bool TryInline( 00113 int64 image_inline_max_bytes, const CachedResult* cached_result, 00114 ResourceSlot* slot, GoogleString* data_url); 00115 00135 static bool ParseDimensionAttribute(const char* position, int* value); 00136 00140 RewriteContext* MakeNestedRewriteContextForCss( 00141 int64 css_image_inline_max_bytes, 00142 RewriteContext* parent, 00143 const ResourceSlotPtr& slot); 00144 00147 virtual RewriteContext* MakeNestedRewriteContext(RewriteContext* parent, 00148 const ResourceSlotPtr& slot); 00149 00152 bool UpdateDesiredImageDimsIfNecessary( 00153 const ImageDim& image_dim, const ResourceContext& resource_context, 00154 ImageDim* desired_dim); 00155 00159 bool ShouldResize(const ResourceContext& context, 00160 const GoogleString& url, 00161 Image* image, 00162 ImageDim* desired_dimensions); 00163 00166 bool ResizeImageIfNecessary( 00167 const RewriteContext* rewrite_context, const GoogleString& url, 00168 ResourceContext* context, Image* image, CachedResult* cached); 00169 00172 Image::CompressionOptions* ImageOptionsForLoadedResource( 00173 const ResourceContext& context, const ResourcePtr& input_resource, 00174 bool is_css); 00175 00176 virtual const RewriteOptions::Filter* RelatedFilters(int* num_filters) const; 00177 virtual const StringPieceVector* RelatedOptions() const { 00178 return related_options_; 00179 } 00180 00182 static void DisableRelatedFilters(RewriteOptions* options); 00183 00184 protected: 00185 virtual const UrlSegmentEncoder* encoder() const; 00186 00187 virtual RewriteContext* MakeRewriteContext(); 00188 00189 private: 00190 class Context; 00191 friend class Context; 00192 00194 const ContentType* ImageToContentType(const GoogleString& origin_url, 00195 Image* image); 00196 void BeginRewriteImageUrl(HtmlElement* element, HtmlElement::Attribute* src); 00197 00198 RewriteResult RewriteLoadedResourceImpl(Context* context, 00199 const ResourcePtr& input_resource, 00200 const OutputResourcePtr& result); 00201 00203 bool FinishRewriteCssImageUrl( 00204 int64 css_image_inline_max_bytes, 00205 const CachedResult* cached, ResourceSlot* slot); 00206 00208 bool FinishRewriteImageUrl( 00209 const CachedResult* cached, const ResourceContext* resource_context, 00210 HtmlElement* element, HtmlElement::Attribute* src, int image_index, 00211 HtmlResourceSlot* slot); 00212 00214 void SaveIfInlinable(const StringPiece& contents, 00215 const ImageType image_type, 00216 CachedResult* cached); 00217 00222 void GetDimensions(HtmlElement* element, ImageDim* page_dim, 00223 const HtmlElement::Attribute* src, 00224 bool* is_resized_using_rendered_dimensions); 00225 00228 bool HasAnyDimensions(HtmlElement* element); 00229 00232 void ResizeLowQualityImage( 00233 Image* low_image, const ResourcePtr& input_resource, 00234 CachedResult* cached); 00235 00240 bool IsHtmlCriticalImage(StringPiece image_url) const; 00241 00245 bool StoreUrlInPropertyCache(const StringPiece& url); 00246 00247 bool SquashImagesForMobileScreenEnabled() const; 00248 00249 scoped_ptr<WorkBound> work_bound_; 00250 00252 00254 Variable* image_rewrites_; 00256 Variable* image_resized_using_rendered_dimensions_; 00258 Variable* image_norewrites_high_resolution_; 00263 Variable* image_rewrites_dropped_intentionally_; 00265 Variable* image_rewrites_dropped_decode_failure_; 00267 Variable* image_rewrites_dropped_mime_type_unknown_; 00270 Variable* image_rewrites_dropped_server_write_fail_; 00273 Variable* image_rewrites_dropped_nosaving_resize_; 00276 Variable* image_rewrites_dropped_nosaving_noresize_; 00278 TimedVariable* image_rewrites_dropped_due_to_load_; 00282 TimedVariable* image_rewrites_squashing_for_mobile_screen_; 00286 Variable* image_rewrite_total_bytes_saved_; 00290 Variable* image_rewrite_total_original_bytes_; 00293 Variable* image_rewrite_uses_; 00295 Variable* image_inline_count_; 00297 Variable* image_webp_rewrites_; 00298 00300 Histogram* image_rewrite_latency_ok_ms_; 00302 Histogram* image_rewrite_latency_failed_ms_; 00303 00304 ImageUrlEncoder encoder_; 00305 00308 int image_counter_; 00309 00313 StringSet inlinable_urls_; 00314 00316 Image::ConversionVariables webp_conversion_variables_; 00317 00319 static StringPieceVector* related_options_; 00320 00321 DISALLOW_COPY_AND_ASSIGN(ImageRewriteFilter); 00322 }; 00323 00324 } 00325 00326 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_REWRITE_FILTER_H_