WIP: snap-width

third_party/WebKit/Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 573 matching lines @@
     quads.append(localToAbsoluteQuad(FloatRect(0, 0, m_frameRect.width().toFloat(), m_frameRect.height().toFloat())));
 }
 
 void LayoutBox::updateLayerTransformAfterLayout()
 {
     // Transform-origin depends on box size, so we need to update the layer transform after layout.
     if (hasLayer())
         layer()->updateTransformationMatrix();
 }
 
+LayoutUnit LayoutBox::snapContentLogicalWidth() const
+{
+    LayoutUnit width = contentLogicalWidth();
+    if (width <= 0)
+        return width;
+    LayoutUnit unit = styleRef().snapWidth();
+    ASSERT(unit > 0);
+    LayoutUnit mod = intMod(width, unit);
+    if (!mod)
+        return width;
+    return LayoutUnit((width - mod).ceil());
+}
+
 LayoutUnit LayoutBox::constrainLogicalWidthByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, LayoutBlock* cb) const
 {
     const ComputedStyle& styleToUse = styleRef();
     if (!styleToUse.logicalMaxWidth().isMaxSizeNone())
         logicalWidth = std::min(logicalWidth, computeLogicalWidthUsing(MaxSize, styleToUse.logicalMaxWidth(), availableWidth, cb));
     return std::max(logicalWidth, computeLogicalWidthUsing(MinSize, styleToUse.logicalMinWidth(), availableWidth, cb));
 }
 
 LayoutUnit LayoutBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
 {
@@ skipping 4136 matching lines @@
 
 void LayoutBox::clearPercentHeightDescendants()
 {
     for (LayoutObject* curr = slowFirstChild(); curr; curr = curr->nextInPreOrder(this)) {
         if (curr->isBox())
             toLayoutBox(curr)->removeFromPercentHeightContainer();
     }
 }
 
 } // namespace blink