141776 2015-02-18 16:04:27 -0800 Horizontal and vertical lines are clipped completely if clip-path is included in the tag but the referenced element is defined later 2015-02-25 17:46:53 -0800 1 1 1 Unclassified WebKit SVG 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 sabouhallawa sabouhallawa darin dino jonlee simon.fraser zalan zimmermann oldest_to_newest 1070261 0 246854 sabouhallawa 2015-02-18 16:04:27 -0800 Created attachment 246854 test case Open the attached test case. It has different lines which are drawn using <line> and <path> elements. All the lines are clipped to a circle <clipPath> which is defined later. Results: Only the horizontal and vertical lines which are defined before defining the clipPath elements are clipped completely. If the page is repainted (through zooming for example), these missing lines are drawn as expected. The reason for this bug is the following. -- RenderSVGResourceClipper::resourceBoundingBox() returns the clipping box of the <clipPath> element for the referencing element. (the <line> or the <path> in the test case) -- If the <clipPath> is defined after it is referenced, RenderSVGResourceClipper::resourceBoundingBox() will see that selfNeedsLayout() is true so it will return object.objectBoundingBox(). -- For the case of horizontal and vertical line, the object.objectBoundingBox() height and width is zero. This means the clipping rectangle is just empty rectangle in this case. -- Later when the base class RenderSVGResourceContainer::layout() runs the layout for the <clipPath>, it figures out it might need to notify its clients. -- But it checks (everHadLayout() && selfNeedsLayout()) before doing so. -- Because it is the first time we run the layout for this <clipPath>, everHadLayout() returns false and end up not calling RenderSVGRoot::addResourceForClientInvalidation() -- Therefore the horizontal and vertical lines are completely clipped since their last clipping boxes were empty rectangles. One interesting thing to notice is if the line is neither horizontal nor vertical, its bonding box is not an empty rectangle. In this case, no clipping is applied to this line not even the <clipPath>. The same thing can happen if more than a line is put a group such that their bounding box is not empty rectangle. The fix can be the following: -- We can keep track of the <clipPath> which is referenced before it is defined by adding the RendererObject to the m_clipper in RenderSVGResourceClipper::resourceBoundingBox(). -- In RenderSVGResourceClipper::applyClippingToContext() we need to ensure the RendererElement is in m_clipper if it does not exist. -- In RenderSVGResourceContainer::layout() we need to use a new virtual function: selfNeedsClientInvalidation() which controls when we need to add the <clipPath> object for clientInvalidation. -- In the base class we implement selfNeedsClientInvalidation() as it was before: (everHadLayout() && selfNeedsLayout()) -- In the derived class we implement selfNeedsClientInvalidation() the same as the base but we add the clause: ((m_clipper.size() && selfNeedsLayout()) 1070262 1 246855 sabouhallawa 2015-02-18 16:05:32 -0800 Created attachment 246855 test case 1070291 2 246862 sabouhallawa 2015-02-18 17:31:23 -0800 Created attachment 246862 Patch 1072152 3 246862 sabouhallawa 2015-02-25 15:05:35 -0800 Comment on attachment 246862 Patch Clearing flags on attachment: 246862 Committed r180643: <http://trac.webkit.org/changeset/180643> 1072153 4 sabouhallawa 2015-02-25 15:05:38 -0800 All reviewed patches have been landed. Closing bug. 1072159 5 246862 darin 2015-02-25 15:22:57 -0800 Comment on attachment 246862 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=246862&action=review > Source/WebCore/rendering/svg/RenderSVGResourceClipper.cpp:260 > +ClipperData* RenderSVGResourceClipper::addRendererToClipper(const RenderObject& object) The pointer this returns is always non-null. This function should return a reference instead of a pointer. > Source/WebCore/rendering/svg/RenderSVGResourceClipper.cpp:264 > + if (!m_clipper.contains(&object)) > + m_clipper.set(&object, std::make_unique<ClipperData>()); > + return m_clipper.get(&object); This code does double hash table lookups. You just moved it, but the performance problem can be fixed, like this: auto& slot = m_clipper.add(&object, nullptr).iterator->value; if (!slot) slot = std::make_unique<ClipperData>(); return slot.get(); That will only do a single hash table lookup. In the future we might invent even cleaner ways to write this. We could also consider making this a HashMap<const RenderObject*, ClipperData> instead. If we did that, then the code would be even simpler: return m_clipper.add(&object, ClipperData()).iterator->value; The map would be larger, because each slot would have an entire ClipperData object. And rehashing would be slower, but we would avoid the overhead of an additional memory block for every slot that is in use. 1072224 6 sabouhallawa 2015-02-25 17:46:53 -0800 I logged https://bugs.webkit.org/show_bug.cgi?id=142032 to track Darin's comments. 246854 2015-02-18 16:04:27 -0800 2015-02-18 16:05:06 -0800 test case clip-path-line-use-before-defined.svg image/svg+xml 846 sabouhallawa PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRw Oi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB3aWR0aD0iMjAwIiBoZWlnaHQ9IjIwMCI+CiAgPGRl ZnM+CiAgICA8c3R5bGU+CiAgICAgIGxpbmUsIHBhdGggewogICAgICAgIGZpbGw6IG5vbmU7CiAg ICAgICAgc3Ryb2tlOiBibHVlOwogICAgICAgIHN0cm9rZS13aWR0aDogMzsKICAgICAgICBzdHJv a2UtbGluZWNhcDogc3F1YXJlOwogICAgICB9CiAgICA8L3N0eWxlPgogIDwvZGVmcz4KICAKICA8 cmVjdCB4PSIwIiB5PSIwIiB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiBmaWxsPSJsaW1lIi8+ CiAgPHJlY3QgeD0iMCIgeT0iMCIgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsbD0ieWVs 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