Merge WebKit at r75993: Initial merge by git.

Change-Id: I602bbdc3974787a3b0450456a30a7868286921c3

1 files changed, 136 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/mathml/RenderMathMLRow.cpp b/Source/WebCore/rendering/mathml/RenderMathMLRow.cpp
new file mode 100644
index 0000000..ad54846
--- /dev/null
+++ b/Source/WebCore/rendering/mathml/RenderMathMLRow.cpp
@@ -0,0 +1,136 @@
+/*
+ * 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 "RenderMathMLRow.h"
+
+#include "MathMLNames.h"
+#include "RenderMathMLOperator.h"
+
+namespace WebCore {
+
+using namespace MathMLNames;
+
+RenderMathMLRow::RenderMathMLRow(Node* row)
+    : RenderMathMLBlock(row)
+{
+}
+
+int RenderMathMLRow::nonOperatorHeight() const
+{
+    int maxHeight = 0;
+    for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
+        if (current->isRenderMathMLBlock()) {
+            RenderMathMLBlock* block = toRenderMathMLBlock(current);
+            int blockHeight = block->nonOperatorHeight();
+            // Check to see if this box has a larger height
+            if (blockHeight > maxHeight)
+                maxHeight = blockHeight;
+        } else if (current->isBoxModelObject()) {
+            RenderBoxModelObject* box = toRenderBoxModelObject(current);
+            // Check to see if this box has a larger height
+            if (box->offsetHeight() > maxHeight)
+                maxHeight = box->offsetHeight();
+        }
+        
+    }
+    return maxHeight;
+}
+
+void RenderMathMLRow::layout() 
+{
+    RenderBlock::layout();
+    
+    int maxHeight = 0;
+    int childCount = 0;
+    int operatorCount = 0;
+
+    // Calculate the non-operator max height of the row.
+    int operatorHeight = 0;
+    for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
+        childCount++;
+        if (current->isRenderMathMLBlock()) {
+            RenderMathMLBlock* block = toRenderMathMLBlock(current);
+            // Check to see if the non-operator block has a greater height.
+            if (!block->hasBase() && !block->isRenderMathMLOperator() && block->offsetHeight() > maxHeight)
+                maxHeight = block->offsetHeight();
+            if (block->hasBase() && block->nonOperatorHeight() > maxHeight) 
+                maxHeight = block->nonOperatorHeight();
+            // If the block is an operator, capture the maximum height and increment the count.
+            if (block->isRenderMathMLOperator()) {
+                if (block->offsetHeight() > operatorHeight)
+                    operatorHeight = block->offsetHeight();
+                operatorCount++;
+            }
+        } else if (current->isBoxModelObject()) {
+            RenderBoxModelObject* box = toRenderBoxModelObject(current);
+            // Check to see if this box has a larger height.
+            if (box->offsetHeight() > maxHeight)
+                maxHeight = box->offsetHeight();
+        }
+    }
+    
+    if (childCount > 0 && childCount == operatorCount) {
+        // We have only operators and so set the max height to the operator height.
+        maxHeight = operatorHeight;
+    }
+    
+    // Stretch everything to the same height (blocks can ignore the request).
+    if (maxHeight > 0) {
+        bool didStretch = false;
+        for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {
+            if (current->isRenderMathMLBlock()) {
+                RenderMathMLBlock* block = toRenderMathMLBlock(current);
+                block->stretchToHeight(maxHeight);
+                didStretch = true;
+            }
+        }
+        if (didStretch) {
+            setNeedsLayout(true);
+            setPreferredLogicalWidthsDirty(true, false);
+            RenderBlock::layout();
+        }
+    }
+    
+}    
+
+int RenderMathMLRow::baselinePosition(FontBaseline, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
+{
+    if (firstChild() && firstChild()->isRenderMathMLBlock()) {
+        RenderMathMLBlock* block = toRenderMathMLBlock(firstChild());
+        if (block->isRenderMathMLOperator())
+            return block->y() + block->baselinePosition(AlphabeticBaseline, firstLine, direction, linePositionMode);
+    }
+    
+    return RenderBlock::baselinePosition(AlphabeticBaseline, firstLine, direction, linePositionMode);
+}
+    
+}
+
+#endif // ENABLE(MATHML)
+