third_party/WebKit/Source/platform/graphics/ContentLayerDelegate.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 *     notice, this list of conditions and the following disclaimer in the
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 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
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#include "platform/graphics/ContentLayerDelegate.h"

#include "platform/RuntimeEnabledFeatures.h"
#include "platform/TraceEvent.h"
#include "platform/TracedValue.h"
#include "platform/geometry/IntRect.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/GraphicsLayer.h"
#include "platform/graphics/paint/PaintArtifactToSkCanvas.h"
#include "platform/graphics/paint/PaintController.h"
#include "public/platform/WebDisplayItemList.h"
#include "public/platform/WebRect.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "ui/gfx/geometry/rect.h"

namespace blink {

ContentLayerDelegate::ContentLayerDelegate(GraphicsLayer* graphicsLayer)
    : m_graphicsLayer(graphicsLayer) {}

ContentLayerDelegate::~ContentLayerDelegate() {}

static void paintArtifactToWebDisplayItemList(WebDisplayItemList* list,
                                              const PaintArtifact& artifact,
                                              const gfx::Rect& bounds) {
  if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
    // This is a temporary path to paint the artifact using the paint chunk
    // properties. Ultimately, we should instead split the artifact into
    // separate layers and send those to the compositor, instead of sending
    // one big flat SkPicture.
    SkRect skBounds = SkRect::MakeXYWH(bounds.x(), bounds.y(), bounds.width(),
                                       bounds.height());
    list->appendDrawingItem(
        WebRect(bounds.x(), bounds.y(), bounds.width(), bounds.height()),
        paintArtifactToSkPicture(artifact, skBounds));
    return;
  }
  artifact.appendToWebDisplayItemList(list);
}

gfx::Rect ContentLayerDelegate::paintableRegion() {
  IntRect interestRect = m_graphicsLayer->interestRect();
  return gfx::Rect(interestRect.x(), interestRect.y(), interestRect.width(),
                   interestRect.height());
}

void ContentLayerDelegate::paintContents(
    WebDisplayItemList* webDisplayItemList,
    WebContentLayerClient::PaintingControlSetting paintingControl) {
  TRACE_EVENT0("blink,benchmark", "ContentLayerDelegate::paintContents");

  PaintController& paintController = m_graphicsLayer->getPaintController();
  paintController.setDisplayItemConstructionIsDisabled(
      paintingControl ==
      WebContentLayerClient::DisplayListConstructionDisabled);
  paintController.setSubsequenceCachingIsDisabled(
      paintingControl == WebContentLayerClient::SubsequenceCachingDisabled);

  if (paintingControl == WebContentLayerClient::PartialInvalidation)
    m_graphicsLayer->client()->invalidateTargetElementForTesting();

  // We also disable caching when Painting or Construction are disabled. In both
  // cases we would like to compare assuming the full cost of recording, not the
  // cost of re-using cached content.
  if (paintingControl != WebContentLayerClient::PaintDefaultBehavior &&
      paintingControl != WebContentLayerClient::PaintDefaultBehaviorForTest &&
      paintingControl != WebContentLayerClient::SubsequenceCachingDisabled)
    paintController.invalidateAll();

  GraphicsContext::DisabledMode disabledMode = GraphicsContext::NothingDisabled;
  if (paintingControl == WebContentLayerClient::DisplayListPaintingDisabled ||
      paintingControl == WebContentLayerClient::DisplayListConstructionDisabled)
    disabledMode = GraphicsContext::FullyDisabled;

  // Anything other than PaintDefaultBehavior is for testing. In non-testing
  // scenarios, it is an error to call GraphicsLayer::paint. Actual painting
  // occurs in FrameView::synchronizedPaint; this method merely copies the
  // painted output to the WebDisplayItemList.
  if (paintingControl != PaintDefaultBehavior)
    m_graphicsLayer->paint(nullptr, disabledMode);

  paintArtifactToWebDisplayItemList(
      webDisplayItemList, paintController.paintArtifact(), paintableRegion());

  paintController.setDisplayItemConstructionIsDisabled(false);
  paintController.setSubsequenceCachingIsDisabled(false);
}

size_t ContentLayerDelegate::approximateUnsharedMemoryUsage() const {
  return m_graphicsLayer->getPaintController().approximateUnsharedMemoryUsage();
}

}  // namespace blink