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- /*
- * Copyright (C) 2011 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:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * 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.
- * * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "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 THE COPYRIGHT
- * OWNER 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
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include "config.h"
- #include "IFrameShimSupport.h"
- #include "Element.h"
- #include "Frame.h"
- #include "FrameView.h"
- #include "HTMLElement.h"
- #include "HTMLFrameOwnerElement.h"
- #include "HTMLNames.h"
- #include "RenderBox.h"
- #include "RenderObject.h"
- #include "Widget.h"
- #include <wtf/HashSet.h>
- // This file provides plugin-related utility functions for iframe shims and is shared by platforms that inherit
- // from PluginView (e.g. Qt) and those that do not (e.g. Chromium).
- namespace WebCore {
- static void getObjectStack(const RenderObject* ro, Vector<const RenderObject*>* roStack)
- {
- roStack->clear();
- while (ro) {
- roStack->append(ro);
- ro = ro->parent();
- }
- }
- // Returns true if stack1 is at or above stack2
- static bool iframeIsAbovePlugin(const Vector<const RenderObject*>& iframeZstack, const Vector<const RenderObject*>& pluginZstack)
- {
- for (size_t i = 0; i < iframeZstack.size() && i < pluginZstack.size(); i++) {
- // The root is at the end of these stacks. We want to iterate
- // root-downwards so we index backwards from the end.
- const RenderObject* ro1 = iframeZstack[iframeZstack.size() - 1 - i];
- const RenderObject* ro2 = pluginZstack[pluginZstack.size() - 1 - i];
- if (ro1 != ro2) {
- // When we find nodes in the stack that are not the same, then
- // we've found the nodes just below the lowest comment ancestor.
- // Determine which should be on top.
- // See if z-index determines an order.
- if (ro1->style() && ro2->style()) {
- int z1 = ro1->style()->zIndex();
- int z2 = ro2->style()->zIndex();
- if (z1 > z2)
- return true;
- if (z1 < z2)
- return false;
- }
- // If the plugin does not have an explicit z-index it stacks behind the iframe.
- // This is for maintaining compatibility with IE.
- if (ro2->style()->position() == StaticPosition) {
- // The 0'th elements of these RenderObject arrays represent the plugin node and
- // the iframe.
- const RenderObject* pluginRenderObject = pluginZstack[0];
- const RenderObject* iframeRenderObject = iframeZstack[0];
- if (pluginRenderObject->style() && iframeRenderObject->style()) {
- if (pluginRenderObject->style()->zIndex() > iframeRenderObject->style()->zIndex())
- return false;
- }
- return true;
- }
- // Inspect the document order. Later order means higher stacking.
- const RenderObject* parent = ro1->parent();
- if (!parent)
- return false;
- ASSERT(parent == ro2->parent());
- for (const RenderObject* ro = parent->firstChild(); ro; ro = ro->nextSibling()) {
- if (ro == ro1)
- return false;
- if (ro == ro2)
- return true;
- }
- ASSERT(false); // We should have seen ro1 and ro2 by now.
- return false;
- }
- }
- return true;
- }
- // Return a set of rectangles that should not be overdrawn by the
- // plugin ("cutouts"). This helps implement the "iframe shim"
- // technique of overlaying a windowed plugin with content from the
- // page. In a nutshell, iframe elements should occlude plugins when
- // they occur higher in the stacking order.
- void getPluginOcclusions(Element* element, Widget* parentWidget, const IntRect& frameRect, Vector<IntRect>& occlusions)
- {
- RenderObject* pluginNode = element->renderer();
- ASSERT(pluginNode);
- if (!pluginNode->style())
- return;
- Vector<const RenderObject*> pluginZstack;
- Vector<const RenderObject*> iframeZstack;
- getObjectStack(pluginNode, &pluginZstack);
- if (!parentWidget->isFrameView())
- return;
- FrameView* parentFrameView = toFrameView(parentWidget);
- const HashSet<RefPtr<Widget> >* children = parentFrameView->children();
- for (HashSet<RefPtr<Widget> >::const_iterator it = children->begin(); it != children->end(); ++it) {
- // We only care about FrameView's because iframes show up as FrameViews.
- if (!(*it)->isFrameView())
- continue;
- const FrameView* frameView = toFrameView((*it).get());
- // Check to make sure we can get both the element and the RenderObject
- // for this FrameView, if we can't just move on to the next object.
- if (!frameView->frame() || !frameView->frame()->ownerElement()
- || !frameView->frame()->ownerElement()->renderer())
- continue;
- HTMLElement* element = frameView->frame()->ownerElement();
- RenderObject* iframeRenderer = element->renderer();
- if (element->hasTagName(HTMLNames::iframeTag)
- && iframeRenderer->absoluteBoundingBoxRectIgnoringTransforms().intersects(frameRect)
- && (!iframeRenderer->style() || iframeRenderer->style()->visibility() == VISIBLE)) {
- getObjectStack(iframeRenderer, &iframeZstack);
- if (iframeIsAbovePlugin(iframeZstack, pluginZstack)) {
- IntPoint point = roundedIntPoint(iframeRenderer->localToAbsolute());
- RenderBox* rbox = toRenderBox(iframeRenderer);
- IntSize size(rbox->width(), rbox->height());
- occlusions.append(IntRect(point, size));
- }
- }
- }
- }
- } // namespace WebCore
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