webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 126 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/mathml/RenderMathMLPadded.cpp b/Source/WebCore/rendering/mathml/RenderMathMLPadded.cpp
new file mode 100644
index 000000000..59b2b01df
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+++ b/Source/WebCore/rendering/mathml/RenderMathMLPadded.cpp
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+/*
+ * Copyright (C) 2016 Igalia S.L. 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"
+#include "RenderMathMLPadded.h"
+
+#if ENABLE(MATHML)
+
+#include <cmath>
+
+namespace WebCore {
+
+RenderMathMLPadded::RenderMathMLPadded(MathMLPaddedElement& element, RenderStyle&& style)
+    : RenderMathMLRow(element, WTFMove(style))
+{
+}
+
+LayoutUnit RenderMathMLPadded::voffset() const
+{
+    return toUserUnits(element().voffset(), style(), 0);
+}
+
+LayoutUnit RenderMathMLPadded::lspace() const
+{
+    LayoutUnit lspace = toUserUnits(element().lspace(), style(), 0);
+    // FIXME: Negative lspace values are not supported yet (https://bugs.webkit.org/show_bug.cgi?id=85730).
+    return std::max<LayoutUnit>(0, lspace);
+}
+
+LayoutUnit RenderMathMLPadded::mpaddedWidth(LayoutUnit contentWidth) const
+{
+    return std::max<LayoutUnit>(0, toUserUnits(element().width(), style(), contentWidth));
+}
+
+LayoutUnit RenderMathMLPadded::mpaddedHeight(LayoutUnit contentHeight) const
+{
+    return std::max<LayoutUnit>(0, toUserUnits(element().height(), style(), contentHeight));
+}
+
+LayoutUnit RenderMathMLPadded::mpaddedDepth(LayoutUnit contentDepth) const
+{
+    return std::max<LayoutUnit>(0, toUserUnits(element().depth(), style(), contentDepth));
+}
+
+void RenderMathMLPadded::computePreferredLogicalWidths()
+{
+    ASSERT(preferredLogicalWidthsDirty());
+
+    // Determine the intrinsic width of the content.
+    RenderMathMLRow::computePreferredLogicalWidths();
+
+    // Only the width attribute should modify the width.
+    // We parse it using the preferred width of the content as its default value.
+    m_maxPreferredLogicalWidth = mpaddedWidth(m_maxPreferredLogicalWidth);
+    m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth;
+
+    setPreferredLogicalWidthsDirty(false);
+}
+
+void RenderMathMLPadded::layoutBlock(bool relayoutChildren, LayoutUnit)
+{
+    ASSERT(needsLayout());
+
+    if (!relayoutChildren && simplifiedLayout())
+        return;
+
+    // We first layout our children as a normal <mrow> element.
+    LayoutUnit contentAscent, contentDescent, contentWidth;
+    contentAscent = contentDescent = 0;
+    RenderMathMLRow::computeLineVerticalStretch(contentAscent, contentDescent);
+    RenderMathMLRow::layoutRowItems(contentAscent, contentDescent);
+    contentWidth = logicalWidth();
+
+    // We parse the mpadded attributes using the content metrics as the default value.
+    LayoutUnit width = mpaddedWidth(contentWidth);
+    LayoutUnit ascent = mpaddedHeight(contentAscent);
+    LayoutUnit descent = mpaddedDepth(contentDescent);
+
+    // Align children on the new baseline and shift them by (lspace, -voffset)
+    LayoutPoint contentLocation(lspace(), ascent - contentAscent - voffset());
+    for (auto* child = firstChildBox(); child; child = child->nextSiblingBox())
+        child->setLocation(child->location() + contentLocation);
+
+    // Set the final metrics.
+    setLogicalWidth(width);
+    setLogicalHeight(ascent + descent);
+
+    clearNeedsLayout();
+}
+
+std::optional<int> RenderMathMLPadded::firstLineBaseline() const
+{
+    // We try and calculate the baseline from the position of the first child.
+    LayoutUnit ascent;
+    if (auto* baselineChild = firstChildBox())
+        ascent = ascentForChild(*baselineChild) + baselineChild->logicalTop() + voffset();
+    else
+        ascent = mpaddedHeight(0);
+    return std::optional<int>(std::lround(static_cast<float>(ascent)));
+}
+
+}
+
+#endif