rendertablecell.cpp

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{
    return table()->collapseBorders() ? borderHalfLeft(false) : RenderBlock::borderLeft();
}

int RenderTableCell::borderRight() const
{
    return table()->collapseBorders() ? borderHalfRight(false) : RenderBlock::borderRight();
}

int RenderTableCell::borderTop() const
{
    return table()->collapseBorders() ? borderHalfTop(false) : RenderBlock::borderTop();
}

int RenderTableCell::borderBottom() const
{
    return table()->collapseBorders() ? borderHalfBottom(false) : RenderBlock::borderBottom();
}

int RenderTableCell::borderHalfLeft(bool outer) const
{
    CollapsedBorderValue border = collapsedLeftBorder(table()->style()->direction() == RTL);
    if (border.exists())
        return (border.width() + (outer ? 0 : 1)) / 2; // Give the extra pixel to top and left.
    return 0;
}
    
int RenderTableCell::borderHalfRight(bool outer) const
{
    CollapsedBorderValue border = collapsedRightBorder(table()->style()->direction() == RTL);
    if (border.exists())
        return (border.width() + (outer ? 1 : 0)) / 2;
    return 0;
}

int RenderTableCell::borderHalfTop(bool outer) const
{
    CollapsedBorderValue border = collapsedTopBorder();
    if (border.exists())
        return (border.width() + (outer ? 0 : 1)) / 2; // Give the extra pixel to top and left.
    return 0;
}

int RenderTableCell::borderHalfBottom(bool outer) const
{
    CollapsedBorderValue border = collapsedBottomBorder();
    if (border.exists())
        return (border.width() + (outer ? 1 : 0)) / 2;
    return 0;
}

void RenderTableCell::paint(PaintInfo& paintInfo, int tx, int ty)
{
    if (paintInfo.phase == PaintPhaseCollapsedTableBorders && style()->visibility() == VISIBLE) {
        tx += x();
        ty += y();
        int os = 2 * maximalOutlineSize(paintInfo.phase);
        if (ty - table()->outerBorderTop() < paintInfo.rect.bottom() + os &&
            ty + height() + table()->outerBorderBottom() > paintInfo.rect.y() - os)
            paintCollapsedBorder(paintInfo.context, tx, ty, width(), height());
        return;
    } 
    
    RenderBlock::paint(paintInfo, tx, ty);
}

static EBorderStyle collapsedBorderStyle(EBorderStyle style)
{
    if (style == OUTSET)
        return GROOVE;
    if (style == INSET)
        return RIDGE;
    return style;
}

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 (int 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];
    int m_count;
};

static void addBorderStyle(RenderTableCell::CollapsedBorderStyles& borderStyles, CollapsedBorderValue borderValue)
{
    if (!borderValue.exists())
        return;
    size_t count = borderStyles.size();
    for (size_t i = 0; i < count; ++i)
        if (borderStyles[i] == borderValue)
            return;
    borderStyles.append(borderValue);
}

void RenderTableCell::collectBorderStyles(CollapsedBorderStyles& borderStyles) const
{
    bool rtl = table()->style()->direction() == RTL;
    addBorderStyle(borderStyles, collapsedLeftBorder(rtl));
    addBorderStyle(borderStyles, collapsedRightBorder(rtl));
    addBorderStyle(borderStyles, collapsedTopBorder());
    addBorderStyle(borderStyles, collapsedBottomBorder());
}

static int compareBorderStylesForQSort(const void* pa, const void* pb)
{
    const CollapsedBorderValue* a = static_cast<const CollapsedBorderValue*>(pa);
    const CollapsedBorderValue* b = static_cast<const CollapsedBorderValue*>(pb);
    if (*a == *b)
        return 0;
    CollapsedBorderValue borderWithHigherPrecedence = compareBorders(*a, *b);
    if (*a == borderWithHigherPrecedence)
        return 1;
    return -1;
}

void RenderTableCell::sortBorderStyles(CollapsedBorderStyles& borderStyles)
{
    qsort(borderStyles.data(), borderStyles.size(), sizeof(CollapsedBorderValue),
        compareBorderStylesForQSort);
}

void RenderTableCell::paintCollapsedBorder(GraphicsContext* graphicsContext, int tx, int ty, int w, int h)
{
    if (!table()->currentBorderStyle())
        return;
    
    bool rtl = table()->style()->direction() == RTL;
    CollapsedBorderValue leftVal = collapsedLeftBorder(rtl);
    CollapsedBorderValue rightVal = collapsedRightBorder(rtl);
    CollapsedBorderValue topVal = collapsedTopBorder();
    CollapsedBorderValue bottomVal = collapsedBottomBorder();
     
    // 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();
    
    tx -= leftWidth / 2;
    ty -= topWidth / 2;
    w += leftWidth / 2 + (rightWidth + 1) / 2;
    h += 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, tx, ty, tx + w, ty + topWidth, topStyle);
    borders.addBorder(bottomVal, BSBottom, renderBottom, tx, ty + h - bottomWidth, tx + w, ty + h, bottomStyle);
    borders.addBorder(leftVal, BSLeft, renderLeft, tx, ty, tx + leftWidth, ty + h, leftStyle);
    borders.addBorder(rightVal, BSRight, renderRight, tx + w - rightWidth, ty, tx + w, ty + h, rightStyle);
    
    for (CollapsedBorder* border = borders.nextBorder(); border; border = borders.nextBorder()) {
        if (border->borderValue == *table()->currentBorderStyle())
            drawLineForBoxSide(graphicsContext, border->x1, border->y1, border->x2, border->y2, border->side, 
                               border->borderValue.color(), style()->color(), border->style, 0, 0);
    }
}

void RenderTableCell::paintBackgroundsBehindCell(PaintInfo& paintInfo, int tx, int ty, RenderObject* backgroundObject)
{
    if (!backgroundObject)
        return;

    if (style()->visibility() != VISIBLE)
        return;

    RenderTable* tableElt = table();
    if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
        return;

    if (backgroundObject != this) {
        tx += x();
        ty += y();
    }

    int w = width();
    int h = height();

    int my = max(ty, paintInfo.rect.y());
    int end = min(paintInfo.rect.bottom(), ty + h);
    int mh = end - my;

    Color c = backgroundObject->style()->backgroundColor();
    const FillLayer* bgLayer = backgroundObject->style()->backgroundLayers();

    if (bgLayer->hasImage() || c.isValid()) {
        // 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 == this || backgroundObject == parent()) && tableElt->collapseBorders();
        if (shouldClip) {
            IntRect clipRect(tx + borderLeft(), ty + borderTop(),
                w - borderLeft() - borderRight(), h - borderTop() - borderBottom());
            paintInfo.context->save();
            paintInfo.context->clip(clipRect);
        }
        paintFillLayers(paintInfo, c, bgLayer, my, mh, tx, ty, w, h);
        if (shouldClip)
            paintInfo.context->restore();
    }
}

void RenderTableCell::paintBoxDecorations(PaintInfo& paintInfo, int tx, int ty)
{
    RenderTable* tableElt = table();
    if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
        return;

    int w = width();
    int h = height();
   
    if (style()->boxShadow())
        paintBoxShadow(paintInfo.context, tx, ty, w, h, style());
    
    // Paint our cell background.
    paintBackgroundsBehindCell(paintInfo, tx, ty, this);

    if (!style()->hasBorder() || tableElt->collapseBorders())
        return;

    paintBorder(paintInfo.context, tx, ty, w, h, style());
}

void RenderTableCell::paintMask(PaintInfo& paintInfo, int tx, int ty)
{
    if (style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
        return;

    RenderTable* tableElt = table();
    if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
        return;

    int w = width();
    int h = height();
   
    int my = max(ty, paintInfo.rect.y());
    int end = min(paintInfo.rect.bottom(), ty + h);
    int mh = end - my;

    paintMaskImages(paintInfo, my, mh, tx, ty, w, h);
}

} // namespace WebCore