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// 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.
#include "third_party/blink/renderer/platform/graphics/paint/scrollbar_display_item.h"
#include "base/trace_event/traced_value.h"
#include "cc/input/scrollbar.h"
#include "cc/layers/scrollbar_layer_base.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/graphics/paint/drawing_recorder.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_controller.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_record_builder.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_recorder.h"
#include "third_party/blink/renderer/platform/graphics/paint/scroll_paint_property_node.h"
#include "ui/gfx/geometry/skia_conversions.h"
namespace blink {
ScrollbarDisplayItem::ScrollbarDisplayItem(
DisplayItemClientId client_id,
Type type,
scoped_refptr<cc::Scrollbar> scrollbar,
const gfx::Rect& visual_rect,
const TransformPaintPropertyNode* scroll_translation,
CompositorElementId element_id,
cc::HitTestOpaqueness hit_test_opaqueness,
RasterEffectOutset outset,
PaintInvalidationReason paint_invalidation_reason)
: DisplayItem(client_id,
type,
visual_rect,
outset,
paint_invalidation_reason,
/*draws_content*/ true),
data_(new Data{std::move(scrollbar), scroll_translation, element_id,
hit_test_opaqueness}) {
DCHECK(IsScrollbar());
CHECK(!data_->scroll_translation_ ||
data_->scroll_translation_->ScrollNode());
}
PaintRecord ScrollbarDisplayItem::Paint() const {
DCHECK(!IsTombstone());
if (!data_->record_.empty() && !NeedsUpdateDisplay()) {
return data_->record_;
}
PaintRecorder recorder;
const gfx::Rect& rect = VisualRect();
recorder.beginRecording();
auto* canvas = recorder.getRecordingCanvas();
auto* scrollbar = data_->scrollbar_.get();
// Skip track and button painting for Minimal mode Fluent scrollbars.
if (!scrollbar->IsFluentOverlayScrollbarMinimalMode()) {
scrollbar->PaintTrackAndButtons(*canvas, rect);
}
gfx::Rect thumb_rect = scrollbar->ThumbRect();
thumb_rect.Offset(rect.OffsetFromOrigin());
if (scrollbar->IsFluentOverlayScrollbarMinimalMode()) {
thumb_rect = scrollbar->ShrinkMainThreadedMinimalModeThumbRect(thumb_rect);
}
scrollbar->PaintThumb(*canvas, thumb_rect);
scrollbar->ClearNeedsUpdateDisplay();
data_->record_ = recorder.finishRecordingAsPicture();
return data_->record_;
}
bool ScrollbarDisplayItem::NeedsUpdateDisplay() const {
return data_->scrollbar_->NeedsUpdateDisplay();
}
scoped_refptr<cc::ScrollbarLayerBase> ScrollbarDisplayItem::CreateOrReuseLayer(
cc::ScrollbarLayerBase* existing_layer,
gfx::Vector2dF offset_of_decomposited_transforms) const {
DCHECK(!IsTombstone());
// This function is called when the scrollbar is composited. We don't need
// record_ which is for non-composited scrollbars.
data_->record_ = PaintRecord();
auto* scrollbar = data_->scrollbar_.get();
auto layer = cc::ScrollbarLayerBase::CreateOrReuse(scrollbar, existing_layer);
layer->SetIsDrawable(true);
layer->SetContentsOpaque(IsOpaque());
layer->SetHitTestOpaqueness(data_->hit_test_opaqueness_);
layer->SetElementId(data_->element_id_);
layer->SetScrollElementId(
data_->scroll_translation_
? data_->scroll_translation_->ScrollNode()->GetCompositorElementId()
: CompositorElementId());
layer->SetOffsetToTransformParent(
gfx::Vector2dF(VisualRect().OffsetFromOrigin()) +
offset_of_decomposited_transforms);
layer->SetBounds(VisualRect().size());
// TODO(crbug.com/1414885): This may be duplicate with
// ScrollableArea::ScrollableArea::SetScrollbarNeedsPaintInvalidation()
// which calls PaintArtifactCompositor::SetScrollbarNeedsDisplay().
if (NeedsUpdateDisplay()) {
layer->SetNeedsDisplay();
scrollbar->ClearNeedsUpdateDisplay();
}
return layer;
}
bool ScrollbarDisplayItem::IsOpaque() const {
DCHECK(!IsTombstone());
return data_->scrollbar_->IsOpaque();
}
bool ScrollbarDisplayItem::EqualsForUnderInvalidationImpl(
const ScrollbarDisplayItem& other) const {
DCHECK(RuntimeEnabledFeatures::PaintUnderInvalidationCheckingEnabled());
// Don't check scrollbar_ because it's always newly created when we repaint
// a scrollbar (including forced repaint for PaintUnderInvalidationChecking).
// Don't check record_ because it's lazily created, and the DCHECKs in Paint()
// can catch most under-invalidation cases.
return data_->scroll_translation_ == other.data_->scroll_translation_ &&
data_->element_id_ == other.data_->element_id_;
}
#if DCHECK_IS_ON()
void ScrollbarDisplayItem::PropertiesAsJSONImpl(JSONObject& json) const {
json.SetString("scrollTranslation",
String::Format("%p", data_->scroll_translation_.Get()));
}
#endif
void ScrollbarDisplayItem::Record(
GraphicsContext& context,
const DisplayItemClient& client,
DisplayItem::Type type,
scoped_refptr<cc::Scrollbar> scrollbar,
const gfx::Rect& visual_rect,
const TransformPaintPropertyNode* scroll_translation,
CompositorElementId element_id,
cc::HitTestOpaqueness hit_test_opaqueness) {
PaintController& paint_controller = context.GetPaintController();
// Must check PaintController::UseCachedItemIfPossible before this function.
DCHECK(RuntimeEnabledFeatures::PaintUnderInvalidationCheckingEnabled() ||
!paint_controller.UseCachedItemIfPossible(client, type));
CHECK(IsScrollbarElementId(element_id));
paint_controller.CreateAndAppend<ScrollbarDisplayItem>(
client, type, std::move(scrollbar), visual_rect, scroll_translation,
element_id, hit_test_opaqueness,
client.VisualRectOutsetForRasterEffects(),
client.GetPaintInvalidationReason());
}
} // namespace blink
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