Canvas2d: Implement rerouting event by hit region's control.

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 23 matching lines @@
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/CSSPropertyNames.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/StyleEngine.h"
 #include "core/events/Event.h"
+#include "core/events/MouseEvent.h"
 #include "core/frame/Settings.h"
 #include "core/html/TextMetrics.h"
 #include "core/html/canvas/CanvasFontCache.h"
 #include "core/layout/LayoutBox.h"
 #include "core/layout/LayoutTheme.h"
 #include "modules/canvas2d/CanvasStyle.h"
 #include "modules/canvas2d/HitRegion.h"
 #include "modules/canvas2d/Path2D.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/graphics/DrawLooperBuilder.h"
@@ skipping 517 matching lines @@
 ImageBuffer* CanvasRenderingContext2D::imageBuffer() const
 {
     return canvas()->buffer();
 }
 
 bool CanvasRenderingContext2D::parseColorOrCurrentColor(Color& color, const String& colorString) const
 {
     return ::blink::parseColorOrCurrentColor(color, colorString, canvas());
 }
 
+std::pair<Element*, String> CanvasRenderingContext2D::getControlAndIdIfHitRegionExists(const LayoutPoint& location)
+{
+    if (hitRegionsCount() <= 0)
+        return std::make_pair(nullptr, String());
+
+    LayoutBox* box = canvas()->layoutBox();
+    FloatPoint localPos = box->absoluteToLocal(FloatPoint(location), UseTransforms);
+    if (box->hasBorderOrPadding())
+        localPos.move(-box->contentBoxOffset());
+    localPos.scale(canvas()->width() / box->contentWidth(), canvas()->height() / box->contentHeight());
+
+    HitRegion* hitRegion = hitRegionAtPoint(localPos);
+    if (hitRegion) {
+        Element* control = hitRegion->control();
+        if (control && canvas()->isSupportedInteractiveCanvasFallback(*control))
+            return std::make_pair(hitRegion->control(), hitRegion->id());
+        return std::make_pair(nullptr, hitRegion->id());
+    }
+    return std::make_pair(nullptr, String());
+}
+
 String CanvasRenderingContext2D::textAlign() const
 {
     return textAlignName(state().getTextAlign());
 }
 
 void CanvasRenderingContext2D::setTextAlign(const String& s)
 {
     TextAlign align;
     if (!parseTextAlign(s, align))
         return;
@@ skipping 424 matching lines @@
 
 unsigned CanvasRenderingContext2D::hitRegionsCount() const
 {
     if (m_hitRegionManager)
         return m_hitRegionManager->getHitRegionsCount();
 
     return 0;
 }
 
 } // namespace blink