WIP: <canvas> hit regions

Source/core/rendering/RenderHTMLCanvas.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/rendering/RenderHTMLCanvas.h"
 
+#include "core/frame/FrameView.h"
+#include "core/frame/LocalFrame.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
-#include "core/frame/FrameView.h"
-#include "core/frame/LocalFrame.h"
+#include "core/html/canvas/CanvasRenderingContext2D.h"
 #include "core/page/Page.h"
+#include "core/rendering/HitTestLocation.h"
 #include "core/rendering/PaintInfo.h"
 #include "core/rendering/RenderView.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
     : RenderReplaced(element, element->size())
 {
     view()->frameView()->setIsVisuallyNonEmpty();
 }
 
 LayerType RenderHTMLCanvas::layerTypeRequired() const
 {
     return NormalLayer;
 }
 
+bool RenderHTMLCanvas::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
+{
+    if (!RenderReplaced::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, hitTestAction))
+        return false;
+
+    if (!visibleToHitTestRequest(request) || hitTestAction != HitTestForeground)
+        return true;
+
+    HTMLCanvasElement* canvas = toHTMLCanvasElement(node());
+    // Thread/plumb through HTMLCanvasElement instead?
+    if (!canvas->renderingContext() || !canvas->renderingContext()->is2d())
+        return true;
+
+    // Check for intersections with hit regions.
+    LayoutPoint adjustedLocation = accumulatedOffset + location();
+    LayoutPoint localPoint = locationInContainer.point() - toLayoutSize(adjustedLocation);
+    if (CanvasHitRegion* hitRegion = toCanvasRenderingContext2D(canvas->renderingContext())->hitRegionAtPoint(localPoint)) {
+        hitRegion = hitRegion;
+        updateHitTestResult(result, localPoint);
+    }
+    return true;
+}
+
 void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     GraphicsContext* context = paintInfo.context;
 
     LayoutRect contentRect = contentBoxRect();
     contentRect.moveBy(paintOffset);
     LayoutRect paintRect = replacedContentRect();
     paintRect.moveBy(paintOffset);
 
     bool clip = !contentRect.contains(paintRect);
@@ skipping 47 matching lines @@
         return CompositingReasonNone;
 
     HTMLCanvasElement* canvas = toHTMLCanvasElement(node());
     if (canvas->renderingContext() && canvas->renderingContext()->isAccelerated())
         return CompositingReasonCanvas;
 
     return CompositingReasonNone;
 }
 
 } // namespace WebCore