Add a basic custom painting facility to Sky

sky/engine/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/dom/Element.h"
 
+#include "base/bind.h"
 #include "gen/sky/core/CSSValueKeywords.h"
 #include "gen/sky/core/HTMLNames.h"
 #include "gen/sky/platform/RuntimeEnabledFeatures.h"
 #include "sky/engine/bindings/exception_messages.h"
 #include "sky/engine/bindings/exception_state.h"
 #include "sky/engine/core/animation/AnimationTimeline.h"
 #include "sky/engine/core/animation/css/CSSAnimations.h"
 #include "sky/engine/core/css/CSSImageValue.h"
 #include "sky/engine/core/css/CSSStyleSheet.h"
 #include "sky/engine/core/css/CSSValuePool.h"
 #include "sky/engine/core/css/PropertySetCSSStyleDeclaration.h"
 #include "sky/engine/core/css/StylePropertySet.h"
 #include "sky/engine/core/css/parser/BisonCSSParser.h"
 #include "sky/engine/core/css/resolver/StyleResolver.h"
 #include "sky/engine/core/dom/Attr.h"
 #include "sky/engine/core/dom/ClientRect.h"
 #include "sky/engine/core/dom/ClientRectList.h"
 #include "sky/engine/core/dom/DOMTokenList.h"
 #include "sky/engine/core/dom/Document.h"
 #include "sky/engine/core/dom/ElementDataCache.h"
 #include "sky/engine/core/dom/ElementRareData.h"
 #include "sky/engine/core/dom/ElementTraversal.h"
 #include "sky/engine/core/dom/ExceptionCode.h"
+#include "sky/engine/core/dom/Microtask.h"
 #include "sky/engine/core/dom/MutationObserverInterestGroup.h"
 #include "sky/engine/core/dom/MutationRecord.h"
 #include "sky/engine/core/dom/NodeRenderStyle.h"
 #include "sky/engine/core/dom/RenderTreeBuilder.h"
 #include "sky/engine/core/dom/SelectorQuery.h"
 #include "sky/engine/core/dom/StyleEngine.h"
 #include "sky/engine/core/dom/Text.h"
 #include "sky/engine/core/dom/custom/custom_element.h"
 #include "sky/engine/core/dom/shadow/InsertionPoint.h"
 #include "sky/engine/core/dom/shadow/ShadowRoot.h"
 #include "sky/engine/core/editing/FrameSelection.h"
 #include "sky/engine/core/editing/TextIterator.h"
 #include "sky/engine/core/editing/htmlediting.h"
 #include "sky/engine/core/events/EventDispatcher.h"
 #include "sky/engine/core/events/FocusEvent.h"
 #include "sky/engine/core/frame/FrameView.h"
 #include "sky/engine/core/frame/LocalFrame.h"
 #include "sky/engine/core/frame/Settings.h"
 #include "sky/engine/core/html/HTMLCanvasElement.h"
 #include "sky/engine/core/html/HTMLElement.h"
 #include "sky/engine/core/html/HTMLTemplateElement.h"
 #include "sky/engine/core/html/parser/HTMLDocumentParser.h"
 #include "sky/engine/core/html/parser/HTMLParserIdioms.h"
 #include "sky/engine/core/page/ChromeClient.h"
 #include "sky/engine/core/page/FocusController.h"
 #include "sky/engine/core/page/Page.h"
+#include "sky/engine/core/painting/PaintingContext.h"
+#include "sky/engine/core/painting/PaintingCallback.h"
 #include "sky/engine/core/rendering/RenderLayer.h"
 #include "sky/engine/core/rendering/RenderView.h"
 #include "sky/engine/platform/EventDispatchForbiddenScope.h"
 #include "sky/engine/tonic/dart_state.h"
 #include "sky/engine/wtf/BitVector.h"
 #include "sky/engine/wtf/HashFunctions.h"
 #include "sky/engine/wtf/text/CString.h"
 #include "sky/engine/wtf/text/StringBuilder.h"
 #include "sky/engine/wtf/text/TextPosition.h"
 
@@ skipping 318 matching lines @@
     if (quads.isEmpty())
         return ClientRect::create();
 
     FloatRect result = quads[0].boundingBox();
     for (size_t i = 1; i < quads.size(); ++i)
         result.unite(quads[i].boundingBox());
 
     return ClientRect::create(result);
 }
 
+// TODO(abarth): We should schedule this work at a more reasonable time.
+static void handlePaintingCommit(RefPtr<Element> element, RefPtr<PaintingContext> context)
+{
+    if (!element->document().isActive())
+        return;
+    element->document().updateLayout();

[ojan, 2015/03/19 22:30:04]

We should not need to do this. I guess that falls out from scheduling the work
at a more reasonable time? We'll need to figure out how to get these callbacks
to not be able to change the tree structure.

+    RenderObject* renderer = element->renderer();
+    if (!renderer || !renderer->isBox())
+        return;
+    toRenderBox(renderer)->setCustomPainting(context->takeDisplayList());
+    element->document().scheduleVisualUpdate();
+}
+
+// TODO(abarth): We should schedule this work at a more reasonable time.
+static void runPaintingCallback(RefPtr<Element> element, PassOwnPtr<PaintingCallback> callback)
+{
+    if (!element->document().isActive())
+        return;
+    element->document().updateLayout();
+    RenderObject* renderer = element->renderer();
+    if (!renderer || !renderer->isBox())
+        return;
+    RefPtr<PaintingContext> context = PaintingContext::create(
+        toRenderBox(renderer)->size(), base::Bind(&handlePaintingCommit, element));
+    callback->handleEvent(context.get());
+}
+
+void Element::requestPaint(PassOwnPtr<PaintingCallback> callback)
+{
+    Microtask::enqueueMicrotask(base::Bind(&runPaintingCallback, this, callback));
+}
+
 void Element::setAttribute(const AtomicString& localName, const AtomicString& value, ExceptionState& exceptionState)
 {
     if (!Document::isValidName(localName)) {
         exceptionState.ThrowDOMException(InvalidCharacterError, "'" + localName + "' is not a valid attribute name.");
         return;
     }
 
     synchronizeAttribute(localName);
 
     if (!elementData()) {
@@ skipping 1130 matching lines @@
         return false;
     if (treeScope().scopedStyleResolver().hasSelectorForId(idValue))
         return true;
     // Host rules could also have effects.
     if (ShadowRoot* shadowRoot = this->shadowRoot())
         return shadowRoot->scopedStyleResolver().hasSelectorForId(idValue);
     return false;
 }
 
 } // namespace blink