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author | Steve Block <steveblock@google.com> | 2011-05-18 13:36:51 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-24 15:38:28 +0100 |
commit | 2fc2651226baac27029e38c9d6ef883fa32084db (patch) | |
tree | e396d4bf89dcce6ed02071be66212495b1df1dec /Source/WebCore/plugins/IFrameShimSupport.cpp | |
parent | b3725cedeb43722b3b175aaeff70552e562d2c94 (diff) | |
download | external_webkit-2fc2651226baac27029e38c9d6ef883fa32084db.zip external_webkit-2fc2651226baac27029e38c9d6ef883fa32084db.tar.gz external_webkit-2fc2651226baac27029e38c9d6ef883fa32084db.tar.bz2 |
Merge WebKit at r78450: Initial merge by git.
Change-Id: I6d3e5f1f868ec266a0aafdef66182ddc3f265dc1
Diffstat (limited to 'Source/WebCore/plugins/IFrameShimSupport.cpp')
-rw-r--r-- | Source/WebCore/plugins/IFrameShimSupport.cpp | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/Source/WebCore/plugins/IFrameShimSupport.cpp b/Source/WebCore/plugins/IFrameShimSupport.cpp new file mode 100644 index 0000000..3deaf09 --- /dev/null +++ b/Source/WebCore/plugins/IFrameShimSupport.cpp @@ -0,0 +1,167 @@ +/* + * 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 "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 = static_cast<FrameView*>(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 = static_cast<const FrameView*>((*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->absoluteBoundingBoxRect().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 |