| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cc/input/main_thread_scrolling_reason.h" |
| |
| #include "base/stl_util.h" |
| #include "base/strings/string_util.h" |
| #include "base/trace_event/traced_value.h" |
| |
| namespace cc { |
| |
| std::string MainThreadScrollingReason::AsText(uint32_t reasons) { |
| base::trace_event::TracedValueJSON traced_value; |
| AddToTracedValue(reasons, traced_value); |
| std::string result = traced_value.ToJSON(); |
| // Remove '{main_thread_scrolling_reasons:[', ']}', and any '"' chars. |
| size_t array_start_pos = result.find('['); |
| size_t array_end_pos = result.find(']'); |
| result = |
| result.substr(array_start_pos + 1, array_end_pos - array_start_pos - 1); |
| base::Erase(result, '\"'); |
| // Add spaces after all commas. |
| base::ReplaceChars(result, ",", ", ", &result); |
| return result; |
| } |
| |
| void MainThreadScrollingReason::AddToTracedValue( |
| uint32_t reasons, |
| base::trace_event::TracedValue& traced_value) { |
| traced_value.BeginArray("main_thread_scrolling_reasons"); |
| |
| if (reasons & kHasBackgroundAttachmentFixedObjects) |
| traced_value.AppendString("Has background-attachment:fixed"); |
| if (reasons & kThreadedScrollingDisabled) |
| traced_value.AppendString("Threaded scrolling is disabled"); |
| if (reasons & kScrollbarScrolling) |
| traced_value.AppendString("Scrollbar scrolling"); |
| if (reasons & kNotOpaqueForTextAndLCDText) |
| traced_value.AppendString("Not opaque for text and LCD text"); |
| if (reasons & kCantPaintScrollingBackgroundAndLCDText) |
| traced_value.AppendString("Can't paint scrolling background and LCD text"); |
| |
| // Transient scrolling reasons. |
| if (reasons & kNonFastScrollableRegion) |
| traced_value.AppendString("Non fast scrollable region"); |
| if (reasons & kFailedHitTest) |
| traced_value.AppendString("Failed hit test"); |
| if (reasons & kNoScrollingLayer) |
| traced_value.AppendString("No scrolling layer"); |
| if (reasons & kNotScrollable) |
| traced_value.AppendString("Not scrollable"); |
| if (reasons & kNonInvertibleTransform) |
| traced_value.AppendString("Non-invertible transform"); |
| if (reasons & kWheelEventHandlerRegion) |
| traced_value.AppendString("Wheel event handler region"); |
| if (reasons & kTouchEventHandlerRegion) |
| traced_value.AppendString("Touch event handler region"); |
| |
| traced_value.EndArray(); |
| } |
| |
| } // namespace cc |