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// Copyright 2019 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 "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/painted_overlay_scrollbar_layer.h"
#include "cc/layers/painted_scrollbar_layer.h"
#include "cc/layers/solid_color_scrollbar_layer.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"
namespace blink {
ScrollbarDisplayItem::ScrollbarDisplayItem(
const DisplayItemClient& client,
Type type,
scoped_refptr<cc::Scrollbar> scrollbar,
const IntRect& rect,
const TransformPaintPropertyNode* scroll_translation,
CompositorElementId element_id)
: DisplayItem(client, type, sizeof(*this), /*draws_content*/ true),
scrollbar_(std::move(scrollbar)),
rect_(rect),
scroll_translation_(scroll_translation),
element_id_(element_id) {
DCHECK(IsScrollbar());
DCHECK(!scroll_translation || scroll_translation->ScrollNode());
}
sk_sp<const PaintRecord> ScrollbarDisplayItem::Paint() const {
// We are painting a non-composited scrollbar, so we don't need layer_.
layer_ = nullptr;
if (record_) {
DCHECK(!scrollbar_->NeedsRepaintPart(cc::TRACK_BUTTONS_TICKMARKS));
DCHECK(!scrollbar_->NeedsRepaintPart(cc::THUMB));
return record_;
}
PaintRecorder recorder;
recorder.beginRecording(rect_);
auto* canvas = recorder.getRecordingCanvas();
scrollbar_->PaintPart(canvas, cc::TRACK_BUTTONS_TICKMARKS, rect_);
gfx::Rect thumb_rect = scrollbar_->ThumbRect();
thumb_rect.Offset(rect_.X(), rect_.Y());
scrollbar_->PaintPart(canvas, cc::THUMB, thumb_rect);
record_ = recorder.finishRecordingAsPicture();
return record_;
}
scoped_refptr<cc::ScrollbarLayerBase> ScrollbarDisplayItem::GetLayer() const {
// This function is called when the scrollbar is composited. We don't need
// record_ which is for non-composited scrollbars.
record_ = nullptr;
if (!layer_ || layer_->is_left_side_vertical_scrollbar() !=
scrollbar_->IsLeftSideVerticalScrollbar())
layer_ = CreateLayer();
layer_->SetOffsetToTransformParent(
gfx::Vector2dF(FloatPoint(rect_.Location())));
layer_->SetBounds(gfx::Size(rect_.Size()));
if (scrollbar_->NeedsRepaintPart(cc::THUMB) ||
scrollbar_->NeedsRepaintPart(cc::TRACK_BUTTONS_TICKMARKS))
layer_->SetNeedsDisplay();
return layer_;
}
scoped_refptr<cc::ScrollbarLayerBase> ScrollbarDisplayItem::CreateLayer()
const {
scoped_refptr<cc::ScrollbarLayerBase> layer;
if (scrollbar_->IsSolidColor()) {
DCHECK(scrollbar_->IsOverlay());
bool is_horizontal = scrollbar_->Orientation() == cc::HORIZONTAL;
gfx::Rect thumb_rect = scrollbar_->ThumbRect();
int thumb_thickness =
is_horizontal ? thumb_rect.height() : thumb_rect.width();
gfx::Rect track_rect = scrollbar_->TrackRect();
int track_start = is_horizontal ? track_rect.x() : track_rect.y();
layer = cc::SolidColorScrollbarLayer::Create(
scrollbar_->Orientation(), thumb_thickness, track_start,
scrollbar_->IsLeftSideVerticalScrollbar());
} else if (scrollbar_->UsesNinePatchThumbResource()) {
DCHECK(scrollbar_->IsOverlay());
layer = cc::PaintedOverlayScrollbarLayer::Create(scrollbar_);
} else {
layer = cc::PaintedScrollbarLayer::Create(scrollbar_);
}
layer->SetIsDrawable(true);
layer->SetElementId(element_id_);
layer->SetScrollElementId(
scroll_translation_
? scroll_translation_->ScrollNode()->GetCompositorElementId()
: CompositorElementId());
return layer;
}
bool ScrollbarDisplayItem::Equals(const DisplayItem& other) const {
if (!DisplayItem::Equals(other))
return false;
// 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.
const auto& other_scrollbar_item =
static_cast<const ScrollbarDisplayItem&>(other);
return rect_ == other_scrollbar_item.rect_ &&
scroll_translation_ == other_scrollbar_item.scroll_translation_ &&
element_id_ == other_scrollbar_item.element_id_;
}
#if DCHECK_IS_ON()
void ScrollbarDisplayItem::PropertiesAsJSON(JSONObject& json) const {
DisplayItem::PropertiesAsJSON(json);
json.SetString("rect", rect_.ToString());
json.SetString("scrollTranslation",
String::Format("%p", scroll_translation_));
}
#endif
void ScrollbarDisplayItem::Record(
GraphicsContext& context,
const DisplayItemClient& client,
DisplayItem::Type type,
scoped_refptr<cc::Scrollbar> scrollbar,
const IntRect& rect,
const TransformPaintPropertyNode* scroll_translation,
CompositorElementId element_id) {
PaintController& paint_controller = context.GetPaintController();
// Must check PaintController::UseCachedItemIfPossible before this function.
DCHECK(RuntimeEnabledFeatures::PaintUnderInvalidationCheckingEnabled() ||
!paint_controller.UseCachedItemIfPossible(client, type));
paint_controller.CreateAndAppend<ScrollbarDisplayItem>(
client, type, std::move(scrollbar), rect, scroll_translation, element_id);
}
} // namespace blink
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