Move painting code from RenderTableCell to TableCellPainter.

Source/core/paint/TableCellPainter.cpp

Index: Source/core/paint/TableCellPainter.cpp
diff --git a/Source/core/paint/TableCellPainter.cpp b/Source/core/paint/TableCellPainter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7892579c7b8cb5838f9d7c265f9e3b74a732a9e4
--- /dev/null
+++ b/Source/core/paint/TableCellPainter.cpp
@@ -0,0 +1,254 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/paint/TableCellPainter.h"
+
+#include "core/paint/BlockPainter.h"
+#include "core/paint/BoxPainter.h"
+#include "core/paint/DrawingRecorder.h"
+#include "core/rendering/PaintInfo.h"
+#include "core/rendering/RenderTableCell.h"
+
+namespace blink {
+
+inline CollapsedBorderValue TableCellPainter::cachedCollapsedLeftBorder(const RenderStyle* styleForCellFlow) const
+{
+    if (styleForCellFlow->isHorizontalWritingMode()) {
+        return styleForCellFlow->isLeftToRightDirection() ? m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSStart)
+            : m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSEnd);
+    }
+    return styleForCellFlow->slowIsFlippedBlocksWritingMode() ? m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSAfter)
+        : m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSBefore);
+}
+
+inline CollapsedBorderValue TableCellPainter::cachedCollapsedRightBorder(const RenderStyle* styleForCellFlow) const
+{
+    if (styleForCellFlow->isHorizontalWritingMode()) {
+        return styleForCellFlow->isLeftToRightDirection() ? m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSEnd)
+            : m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSStart);
+    }
+    return styleForCellFlow->slowIsFlippedBlocksWritingMode() ? m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSBefore)
+        : m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSAfter);
+}
+
+inline CollapsedBorderValue TableCellPainter::cachedCollapsedTopBorder(const RenderStyle* styleForCellFlow) const
+{
+    if (styleForCellFlow->isHorizontalWritingMode())
+        return styleForCellFlow->slowIsFlippedBlocksWritingMode() ? m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSAfter) : m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSBefore);
+    return styleForCellFlow->isLeftToRightDirection() ? m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSStart) : m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSEnd);
+}
+
+inline CollapsedBorderValue TableCellPainter::cachedCollapsedBottomBorder(const RenderStyle* styleForCellFlow) const
+{
+    if (styleForCellFlow->isHorizontalWritingMode()) {
+        return styleForCellFlow->slowIsFlippedBlocksWritingMode() ? m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSBefore)
+            : m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSAfter);
+    }
+    return styleForCellFlow->isLeftToRightDirection() ? m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSEnd)
+        : m_renderTableCell.section()->cachedCollapsedBorder(&m_renderTableCell, CBSStart);
+}
+
+void TableCellPainter::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+{
+    ASSERT(paintInfo.phase != PaintPhaseCollapsedTableBorders);
+    BlockPainter(m_renderTableCell).paint(paintInfo, paintOffset);
+}
+
+struct CollapsedBorder {
+    CollapsedBorderValue borderValue;
+    BoxSide side;
+    bool shouldPaint;
+    int x1;
+    int y1;
+    int x2;
+    int y2;
+    EBorderStyle style;
+};
+
+class CollapsedBorders {
+public:
+    CollapsedBorders()
+        : m_count(0)
+    {
+    }
+
+    void addBorder(const CollapsedBorderValue& borderValue, BoxSide borderSide, bool shouldPaint, int x1, int y1, int x2, int y2, EBorderStyle borderStyle)
+    {
+        if (borderValue.exists() && shouldPaint) {
+            m_borders[m_count].borderValue = borderValue;
+            m_borders[m_count].side = borderSide;
+            m_borders[m_count].shouldPaint = shouldPaint;
+            m_borders[m_count].x1 = x1;
+            m_borders[m_count].x2 = x2;
+            m_borders[m_count].y1 = y1;
+            m_borders[m_count].y2 = y2;
+            m_borders[m_count].style = borderStyle;
+            m_count++;
+        }
+    }
+
+    CollapsedBorder* nextBorder()
+    {
+        for (unsigned i = 0; i < m_count; i++) {
+            if (m_borders[i].borderValue.exists() && m_borders[i].shouldPaint) {
+                m_borders[i].shouldPaint = false;
+                return &m_borders[i];
+            }
+        }
+
+        return 0;
+    }
+
+    CollapsedBorder m_borders[4];
+    unsigned m_count;
+};
+
+static EBorderStyle collapsedBorderStyle(EBorderStyle style)
+{
+    if (style == OUTSET)
+        return GROOVE;
+    if (style == INSET)
+        return RIDGE;
+    return style;
+}
+
+void TableCellPainter::paintCollapsedBorders(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+{
+    ASSERT(paintInfo.phase == PaintPhaseCollapsedTableBorders);
+
+    if (!paintInfo.shouldPaintWithinRoot(&m_renderTableCell) || m_renderTableCell.style()->visibility() != VISIBLE)
+        return;
+
+    LayoutRect paintRect = LayoutRect(paintOffset + m_renderTableCell.location(), m_renderTableCell.pixelSnappedSize());
+    if (paintRect.y() - m_renderTableCell.table()->outerBorderTop() >= paintInfo.rect.maxY())
+        return;
+
+    if (paintRect.maxY() + m_renderTableCell.table()->outerBorderBottom() <= paintInfo.rect.y())
+        return;
+
+    if (!m_renderTableCell.table()->currentBorderValue())
+        return;
+
+    const RenderStyle* styleForCellFlow = m_renderTableCell.styleForCellFlow();
+    CollapsedBorderValue leftVal = cachedCollapsedLeftBorder(styleForCellFlow);
+    CollapsedBorderValue rightVal = cachedCollapsedRightBorder(styleForCellFlow);
+    CollapsedBorderValue topVal = cachedCollapsedTopBorder(styleForCellFlow);
+    CollapsedBorderValue bottomVal = cachedCollapsedBottomBorder(styleForCellFlow);
+
+    // Adjust our x/y/width/height so that we paint the collapsed borders at the correct location.
+    int topWidth = topVal.width();
+    int bottomWidth = bottomVal.width();
+    int leftWidth = leftVal.width();
+    int rightWidth = rightVal.width();
+
+    IntRect borderRect = pixelSnappedIntRect(paintRect.x() - leftWidth / 2,
+        paintRect.y() - topWidth / 2,
+        paintRect.width() + leftWidth / 2 + (rightWidth + 1) / 2,
+        paintRect.height() + topWidth / 2 + (bottomWidth + 1) / 2);
+
+    EBorderStyle topStyle = collapsedBorderStyle(topVal.style());
+    EBorderStyle bottomStyle = collapsedBorderStyle(bottomVal.style());
+    EBorderStyle leftStyle = collapsedBorderStyle(leftVal.style());
+    EBorderStyle rightStyle = collapsedBorderStyle(rightVal.style());
+
+    bool renderTop = topStyle > BHIDDEN && !topVal.isTransparent();
+    bool renderBottom = bottomStyle > BHIDDEN && !bottomVal.isTransparent();
+    bool renderLeft = leftStyle > BHIDDEN && !leftVal.isTransparent();
+    bool renderRight = rightStyle > BHIDDEN && !rightVal.isTransparent();
+
+    // We never paint diagonals at the joins.  We simply let the border with the highest
+    // precedence paint on top of borders with lower precedence.
+    CollapsedBorders borders;
+    borders.addBorder(topVal, BSTop, renderTop, borderRect.x(), borderRect.y(), borderRect.maxX(), borderRect.y() + topWidth, topStyle);
+    borders.addBorder(bottomVal, BSBottom, renderBottom, borderRect.x(), borderRect.maxY() - bottomWidth, borderRect.maxX(), borderRect.maxY(), bottomStyle);
+    borders.addBorder(leftVal, BSLeft, renderLeft, borderRect.x(), borderRect.y(), borderRect.x() + leftWidth, borderRect.maxY(), leftStyle);
+    borders.addBorder(rightVal, BSRight, renderRight, borderRect.maxX() - rightWidth, borderRect.y(), borderRect.maxX(), borderRect.maxY(), rightStyle);
+
+    GraphicsContext* graphicsContext = paintInfo.context;
+    bool antialias = BoxPainter::shouldAntialiasLines(graphicsContext);
+
+    for (CollapsedBorder* border = borders.nextBorder(); border; border = borders.nextBorder()) {
+        if (border->borderValue.isSameIgnoringColor(*m_renderTableCell.table()->currentBorderValue())) {
+            ObjectPainter::drawLineForBoxSide(graphicsContext, border->x1, border->y1, border->x2, border->y2, border->side,
+                border->borderValue.color().resolve(m_renderTableCell.style()->visitedDependentColor(CSSPropertyColor)), border->style, 0, 0, antialias);
+        }
+    }
+}
+
+void TableCellPainter::paintBackgroundsBehindCell(PaintInfo& paintInfo, const LayoutPoint& paintOffset, RenderObject* backgroundObject)
+{
+    if (!paintInfo.shouldPaintWithinRoot(&m_renderTableCell))
+        return;
+
+    if (!backgroundObject)
+        return;
+
+    if (m_renderTableCell.style()->visibility() != VISIBLE)
+        return;
+
+    RenderTable* tableElt = m_renderTableCell.table();
+    if (!tableElt->collapseBorders() && m_renderTableCell.style()->emptyCells() == HIDE && !m_renderTableCell.firstChild())
+        return;
+
+    LayoutPoint adjustedPaintOffset = paintOffset;
+    if (backgroundObject != &m_renderTableCell)
+        adjustedPaintOffset.moveBy(m_renderTableCell.location());
+
+    Color c = backgroundObject->resolveColor(CSSPropertyBackgroundColor);
+    const FillLayer& bgLayer = backgroundObject->style()->backgroundLayers();
+
+    if (bgLayer.hasImage() || c.alpha()) {
+        // We have to clip here because the background would paint
+        // on top of the borders otherwise.  This only matters for cells and rows.
+        bool shouldClip = backgroundObject->hasLayer() && (backgroundObject == &m_renderTableCell || backgroundObject == m_renderTableCell.parent()) && tableElt->collapseBorders();
+        GraphicsContextStateSaver stateSaver(*paintInfo.context, shouldClip);
+        if (shouldClip) {
+            LayoutRect clipRect(adjustedPaintOffset.x() + m_renderTableCell.borderLeft(), adjustedPaintOffset.y() + m_renderTableCell.borderTop(),
+                m_renderTableCell.width() - m_renderTableCell.borderLeft() - m_renderTableCell.borderRight(),
+                m_renderTableCell.height() - m_renderTableCell.borderTop() - m_renderTableCell.borderBottom());
+            paintInfo.context->clip(clipRect);
+        }
+        BoxPainter(m_renderTableCell).paintFillLayers(paintInfo, c, bgLayer, LayoutRect(adjustedPaintOffset, m_renderTableCell.pixelSnappedSize()), BackgroundBleedNone, CompositeSourceOver, backgroundObject);
+    }
+}
+
+void TableCellPainter::paintBoxDecorationBackground(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+{
+    if (!paintInfo.shouldPaintWithinRoot(&m_renderTableCell))
+        return;
+
+    RenderTable* tableElt = m_renderTableCell.table();
+    if (!tableElt->collapseBorders() && m_renderTableCell.style()->emptyCells() == HIDE && !m_renderTableCell.firstChild())
+        return;
+
+    LayoutRect paintRect = LayoutRect(paintOffset, m_renderTableCell.pixelSnappedSize());
+    DrawingRecorder recorder(paintInfo.context, &m_renderTableCell, paintInfo.phase, pixelSnappedIntRect(paintRect));
+    BoxPainter::paintBoxShadow(paintInfo, paintRect, m_renderTableCell.style(), Normal);
+
+    // Paint our cell background.
+    paintBackgroundsBehindCell(paintInfo, paintOffset, &m_renderTableCell);
+
+    BoxPainter::paintBoxShadow(paintInfo, paintRect, m_renderTableCell.style(), Inset);
+
+    if (!m_renderTableCell.style()->hasBorder() || tableElt->collapseBorders())
+        return;
+
+    BoxPainter::paintBorder(m_renderTableCell, paintInfo, paintRect, m_renderTableCell.style());
+}
+
+void TableCellPainter::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+{
+    if (m_renderTableCell.style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
+        return;
+
+    RenderTable* tableElt = m_renderTableCell.table();
+    if (!tableElt->collapseBorders() && m_renderTableCell.style()->emptyCells() == HIDE && !m_renderTableCell.firstChild())
+        return;
+
+    BoxPainter(m_renderTableCell).paintMaskImages(paintInfo, LayoutRect(paintOffset, m_renderTableCell.pixelSnappedSize()));
+}
+
+} // namespace blink
+