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// Copyright 2014 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/core/paint/frame_painter.h"
#include "third_party/blink/renderer/core/frame/local_frame_view.h"
#include "third_party/blink/renderer/core/inspector/inspector_trace_events.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/paint/frame_paint_timing.h"
#include "third_party/blink/renderer/core/paint/paint_layer.h"
#include "third_party/blink/renderer/core/paint/paint_layer_painter.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/graphics/graphics_layer.h"
#include "third_party/blink/renderer/platform/graphics/paint/cull_rect.h"
#include "third_party/blink/renderer/platform/graphics/paint/drawing_recorder.h"
#include "third_party/blink/renderer/platform/loader/fetch/memory_cache.h"
namespace blink {
bool FramePainter::in_paint_contents_ = false;
void FramePainter::Paint(GraphicsContext& context,
const GlobalPaintFlags global_paint_flags,
const CullRect& cull_rect) {
if (GetFrameView().ShouldThrottleRendering())
return;
GetFrameView().NotifyPageThatContentAreaWillPaint();
CullRect document_cull_rect(
Intersection(cull_rect.Rect(), GetFrameView().FrameRect()));
document_cull_rect.MoveBy(-GetFrameView().Location());
if (document_cull_rect.Rect().IsEmpty())
return;
PaintContents(context, global_paint_flags, document_cull_rect);
}
void FramePainter::PaintContents(GraphicsContext& context,
const GlobalPaintFlags global_paint_flags,
const CullRect& cull_rect) {
Document* document = GetFrameView().GetFrame().GetDocument();
if (GetFrameView().ShouldThrottleRendering() || !document->IsActive())
return;
LayoutView* layout_view = GetFrameView().GetLayoutView();
if (!layout_view) {
DLOG(ERROR) << "called FramePainter::paint with nil layoutObject";
return;
}
// TODO(crbug.com/590856): It's still broken when we choose not to crash when
// the check fails.
if (!GetFrameView().CheckDoesNotNeedLayout())
return;
// TODO(wangxianzhu): The following check should be stricter, but currently
// this is blocked by the svg root issue (crbug.com/442939).
DCHECK(document->Lifecycle().GetState() >=
DocumentLifecycle::kCompositingAssignmentsClean);
FramePaintTiming frame_paint_timing(context, &GetFrameView().GetFrame());
TRACE_EVENT1("devtools.timeline,rail", "Paint", "data",
inspector_paint_event::Data(
layout_view, PhysicalRect(cull_rect.Rect()), nullptr));
bool is_top_level_painter = !in_paint_contents_;
in_paint_contents_ = true;
FontCachePurgePreventer font_cache_purge_preventer;
PaintLayerFlags root_layer_paint_flags = 0;
// This will prevent clipping the root PaintLayer to its visible content
// rect when root layer scrolling is enabled.
if (document->IsCapturingLayout())
root_layer_paint_flags = kPaintLayerPaintingOverflowContents;
PaintLayer* root_layer = layout_view->Layer();
#if DCHECK_IS_ON()
layout_view->AssertSubtreeIsLaidOut();
LayoutObject::SetLayoutNeededForbiddenScope forbid_set_needs_layout(
root_layer->GetLayoutObject());
#endif
PaintLayerPainter layer_painter(*root_layer);
float device_scale_factor = blink::DeviceScaleFactorDeprecated(
root_layer->GetLayoutObject().GetFrame());
context.SetDeviceScaleFactor(device_scale_factor);
layer_painter.Paint(context, cull_rect, global_paint_flags,
root_layer_paint_flags);
// Regions may have changed as a result of the visibility/z-index of element
// changing.
if (document->AnnotatedRegionsDirty())
GetFrameView().UpdateDocumentAnnotatedRegions();
if (is_top_level_painter) {
// Everything that happens after paintContents completions is considered
// to be part of the next frame.
GetMemoryCache()->UpdateFramePaintTimestamp();
in_paint_contents_ = false;
}
}
const LocalFrameView& FramePainter::GetFrameView() {
DCHECK(frame_view_);
return *frame_view_;
}
} // namespace blink
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