| // Copyright 2019 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_LAZY_IMAGE_HELPER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_LAZY_IMAGE_HELPER_H_ |
| |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| |
| namespace blink { |
| |
| class Document; |
| class Element; |
| class HTMLImageElement; |
| class LocalFrame; |
| |
| // Contains helper functions to deal with the lazy loading logic of images. |
| class LazyImageHelper final { |
| STATIC_ONLY(LazyImageHelper); |
| |
| public: |
| static void StartMonitoring(Element* element); |
| static void StopMonitoring(Element* element); |
| |
| static bool LoadAllImagesAndBlockLoadEvent(Document&); |
| |
| static bool ShouldDeferImageLoad(LocalFrame& frame, |
| HTMLImageElement* html_image); |
| |
| static void StartMonitoringVisibilityMetrics(HTMLImageElement* html_image); |
| |
| static void RecordMetricsOnLoadFinished(HTMLImageElement* image_element); |
| }; |
| |
| } // namespace blink |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_LAZY_IMAGE_HELPER_H_ |