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- // 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/containers/cxx20_erase.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();
- }
- int MainThreadScrollingReason::BucketIndexForTesting(uint32_t reason) {
- // These two values are already bucket indices.
- DCHECK_NE(reason, kNotScrollingOnMain);
- DCHECK_NE(reason, kScrollingOnMainForAnyReason);
- int index = 0;
- while (reason >>= 1)
- ++index;
- DCHECK_NE(index, 0);
- return index;
- }
- } // namespace cc
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