Merge WebKit at r75993: Initial merge by git.

Change-Id: I602bbdc3974787a3b0450456a30a7868286921c3

1 files changed, 212 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/mathml/RenderMathMLSubSup.cpp b/Source/WebCore/rendering/mathml/RenderMathMLSubSup.cpp
new file mode 100644
index 0000000..0ea6667
--- /dev/null
+++ b/Source/WebCore/rendering/mathml/RenderMathMLSubSup.cpp
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2010 Alex Milowski (alex@milowski.com). All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * 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"
+
+#if ENABLE(MATHML)
+
+#include "RenderMathMLSubSup.h"
+
+#include "FontSelector.h"
+#include "MathMLNames.h"
+#include "RenderInline.h"
+#include "RenderTable.h"
+#include "RenderTableCell.h"
+#include "RenderTableRow.h"
+#include "RenderTableSection.h"
+#include "RenderText.h"
+
+namespace WebCore {
+    
+using namespace MathMLNames;
+
+static const int gTopAdjustDivisor = 3;
+static const int gSubsupScriptMargin = 1;
+static const float gSubSupStretch = 1.2f;
+
+RenderMathMLSubSup::RenderMathMLSubSup(Element* element) 
+    : RenderMathMLBlock(element)
+    , m_scripts(0)
+{
+    // Determine what kind of under/over expression we have by element name
+    if (element->hasLocalName(MathMLNames::msubTag))
+        m_kind = Sub;
+    else if (element->hasLocalName(MathMLNames::msupTag))
+        m_kind = Sup;
+    else if (element->hasLocalName(MathMLNames::msubsupTag))
+        m_kind = SubSup;
+    else 
+        m_kind = SubSup;
+}
+
+void RenderMathMLSubSup::addChild(RenderObject* child, RenderObject* beforeChild)
+{
+    if (firstChild()) {
+        // We already have a base, so this is the super/subscripts being added.
+        
+        if (m_kind == SubSup) {
+            if (!m_scripts) {
+                m_scripts = new (renderArena()) RenderMathMLBlock(node());
+                RefPtr<RenderStyle> scriptsStyle = RenderStyle::create();
+                scriptsStyle->inheritFrom(style());
+                scriptsStyle->setDisplay(INLINE_BLOCK);
+                scriptsStyle->setVerticalAlign(TOP);
+                scriptsStyle->setMarginLeft(Length(gSubsupScriptMargin, Fixed));
+                scriptsStyle->setTextAlign(LEFT);
+                m_scripts->setStyle(scriptsStyle.release());
+                RenderMathMLBlock::addChild(m_scripts, beforeChild);
+            }
+            
+            RenderBlock* script = new (renderArena()) RenderMathMLBlock(node());
+            RefPtr<RenderStyle> scriptStyle = RenderStyle::create();
+            scriptStyle->inheritFrom(m_scripts->style());
+            scriptStyle->setDisplay(BLOCK);
+            script->setStyle(scriptStyle.release());
+            
+            m_scripts->addChild(script, m_scripts->firstChild());
+            script->addChild(child);
+        } else
+            RenderMathMLBlock::addChild(child, beforeChild);
+        
+    } else {
+        RenderMathMLBlock* wrapper = new (renderArena()) RenderMathMLBlock(node());
+        RefPtr<RenderStyle> wrapperStyle = RenderStyle::create();
+        wrapperStyle->inheritFrom(style());
+        wrapperStyle->setDisplay(INLINE_BLOCK);
+        wrapperStyle->setVerticalAlign(BASELINE);
+        wrapper->setStyle(wrapperStyle.release());
+        RenderMathMLBlock::addChild(wrapper, beforeChild);
+        wrapper->addChild(child);
+        
+    }
+}
+
+void RenderMathMLSubSup::stretchToHeight(int height)
+{
+    RenderObject* base = firstChild();
+    if (!base)
+        return;
+    
+    if (base->firstChild()->isRenderMathMLBlock()) {
+        RenderMathMLBlock* block = toRenderMathMLBlock(base->firstChild());
+        block->stretchToHeight(static_cast<int>(gSubSupStretch * height));
+        
+        // Adjust the script placement after we stretch
+        if (height > 0 && m_kind == SubSup && m_scripts) {
+            RenderObject* script = m_scripts->firstChild();
+            if (script) {
+                // Calculate the script height without the container margins.
+                RenderObject* top = script;
+                int topHeight = getBoxModelObjectHeight(top->firstChild());
+                int topAdjust = topHeight / gTopAdjustDivisor;
+                top->style()->setMarginTop(Length(-topAdjust, Fixed));
+                top->style()->setMarginBottom(Length(height - topHeight + topAdjust, Fixed));
+                if (top->isBoxModelObject()) {
+                    RenderBoxModelObject* topBox = toRenderBoxModelObject(top);
+                    topBox->updateBoxModelInfoFromStyle();
+                }
+                m_scripts->setNeedsLayout(true);
+                setNeedsLayout(true);
+            }
+        }
+        
+    }
+}
+
+int RenderMathMLSubSup::nonOperatorHeight() const 
+{
+    if (m_kind == SubSup) 
+       return static_cast<int>(style()->fontSize()*gSubSupStretch);
+    return static_cast<int>(style()->fontSize());
+}
+
+void RenderMathMLSubSup::layout() 
+{
+    if (firstChild())
+        firstChild()->setNeedsLayout(true);
+    if (m_scripts) 
+        m_scripts->setNeedsLayout(true);
+    
+    RenderBlock::layout();
+    
+    if (m_kind == SubSup) {
+        if (RenderObject* base = firstChild()) {
+            int maxHeight = 0;
+            RenderObject* current = base->firstChild();
+            while (current) {
+                int height = getBoxModelObjectHeight(current);
+                if (height > maxHeight)
+                    maxHeight = height;
+                current = current->nextSibling();
+            }
+            int heightDiff = m_scripts ? (m_scripts->offsetHeight() - maxHeight) / 2 : 0;
+            if (heightDiff < 0) 
+                heightDiff = 0;
+            base->style()->setPaddingTop(Length(heightDiff, Fixed));
+            base->setNeedsLayout(true);
+        }
+        setNeedsLayout(true);
+        RenderBlock::layout();
+    }    
+}
+
+int RenderMathMLSubSup::baselinePosition(FontBaseline, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
+{
+    RenderObject* base = firstChild();
+    if (!base) 
+        return offsetHeight();
+    
+    int baseline = offsetHeight();
+    if (!base || !base->isBoxModelObject()) 
+        return baseline;
+
+    switch (m_kind) {
+    case SubSup:
+        base = base->firstChild();
+        if (m_scripts && base->isBoxModelObject()) {
+            RenderBoxModelObject* box = toRenderBoxModelObject(base);
+            
+            int topAdjust = (m_scripts->offsetHeight() - box->offsetHeight()) / 2;
+        
+            // FIXME: The last bit of this calculation should be more exact.  Why is the 2-3px scaled for zoom necessary?
+            // The baseline is top spacing of the base + the baseline of the base + adjusted space for zoom
+            float zoomFactor = style()->effectiveZoom();
+            return topAdjust + box->baselinePosition(AlphabeticBaseline, firstLine, direction, linePositionMode) + static_cast<int>((zoomFactor > 1.25 ? 2 : 3) * zoomFactor);
+        }
+        break;
+    case Sup: 
+    case Sub:
+        RenderBoxModelObject* box = toRenderBoxModelObject(base);
+        baseline = box->baselinePosition(AlphabeticBaseline, firstLine, direction, linePositionMode);
+        break;
+    }
+    
+    return baseline;
+    
+}
+    
+}    
+
+#endif // ENABLE(MATHML)