C++ LayoutRect::expand方法代码示例

void RenderFieldset::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (style().visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
        return;

    LayoutRect paintRect = LayoutRect(paintOffset, size());
    RenderBox* legend = findLegend();
    if (!legend)
        return RenderBlockFlow::paintMask(paintInfo, paintOffset);

    // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
    // cases the legend is embedded in the right and bottom borders respectively.
    // https://bugs.webkit.org/show_bug.cgi?id=47236
    if (style().isHorizontalWritingMode()) {
        LayoutUnit yOff = (legend->y() > 0) ? LayoutUnit() : (legend->height() - borderTop()) / 2;
        paintRect.expand(0, -yOff);
        paintRect.move(0, yOff);
    } else {
        LayoutUnit xOff = (legend->x() > 0) ? LayoutUnit() : (legend->width() - borderLeft()) / 2;
        paintRect.expand(-xOff, 0);
        paintRect.move(xOff, 0);
    }

    paintMaskImages(paintInfo, paintRect);
}

void FieldsetPainter::paintMask(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (m_layoutFieldset.style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
        return;

    LayoutRect paintRect = LayoutRect(paintOffset, m_layoutFieldset.size());
    LayoutBox* legend = m_layoutFieldset.findInFlowLegend();
    if (!legend)
        return BoxPainter(m_layoutFieldset).paintMask(paintInfo, paintOffset);

    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutFieldset, paintInfo.phase, paintOffset))
        return;

    // FIXME: We need to work with "rl" and "bt" block flow directions.  In those
    // cases the legend is embedded in the right and bottom borders respectively.
    // https://bugs.webkit.org/show_bug.cgi?id=47236
    if (m_layoutFieldset.style()->isHorizontalWritingMode()) {
        LayoutUnit yOff = (legend->location().y() > LayoutUnit()) ? LayoutUnit() : (legend->size().height() - m_layoutFieldset.borderTop()) / 2;
        paintRect.expand(LayoutUnit(), -yOff);
        paintRect.move(LayoutUnit(), yOff);
    } else {
        LayoutUnit xOff = (legend->location().x() > LayoutUnit()) ? LayoutUnit() : (legend->size().width() - m_layoutFieldset.borderLeft()) / 2;
        paintRect.expand(-xOff, LayoutUnit());
        paintRect.move(xOff, LayoutUnit());
    }

    LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutFieldset, paintInfo.phase, paintRect, paintOffset);
    BoxPainter(m_layoutFieldset).paintMaskImages(paintInfo, paintRect);
}

LayoutRect FilterEffectRenderer::computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect)
{
    // The result of this function is the area in the "filterBoxRect" that needs to be repainted, so that we fully cover the "dirtyRect".
    LayoutRect rectForRepaint = dirtyRect;
    if (hasFilterThatMovesPixels()) {
        // Note that the outsets are reversed here because we are going backwards -> we have the dirty rect and
        // need to find out what is the rectangle that might influence the result inside that dirty rect.
        rectForRepaint.move(-m_outsets.right(), -m_outsets.bottom());
        rectForRepaint.expand(m_outsets.left() + m_outsets.right(), m_outsets.top() + m_outsets.bottom());
    }
    rectForRepaint.intersect(filterBoxRect);
    return rectForRepaint;
}

LayoutRect FilterEffectRenderer::computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect)
{
#if ENABLE(CSS_SHADERS)
    if (hasCustomShaderFilter()) {
        // When we have at least a custom shader in the chain, we need to compute the whole source image, because the shader can
        // reference any pixel and we cannot control that.
        return filterBoxRect;
    }
#endif
    // The result of this function is the area in the "filterBoxRect" that needs to be repainted, so that we fully cover the "dirtyRect".
    LayoutRect rectForRepaint = dirtyRect;
    if (hasFilterThatMovesPixels()) {
        // Note that the outsets are reversed here because we are going backwards -> we have the dirty rect and
        // need to find out what is the rectangle that might influence the result inside that dirty rect.
        rectForRepaint.move(-m_rightOutset, -m_bottomOutset);
        rectForRepaint.expand(m_leftOutset + m_rightOutset, m_topOutset + m_bottomOutset);
    }
    rectForRepaint.intersect(filterBoxRect);
    return rectForRepaint;
}

LayoutRect RenderNamedFlowFragment::flowThreadPortionRectForClipping(bool isFirstRegionInRange, bool isLastRegionInRange) const
{
    // Elements flowed into a region should not be painted past the region's content box
    // if they continue to flow into another region in that direction.
    // If they do not continue into another region in that direction, they should be
    // painted all the way to the region's border box.
    // Regions with overflow:hidden will apply clip at the border box, not the content box.
    
    LayoutRect clippingRect = flowThreadPortionRect();
    RenderBlockFlow& container = fragmentContainer();
    if (container.style().hasPadding()) {
        if (isFirstRegionInRange) {
            if (flowThread()->isHorizontalWritingMode()) {
                clippingRect.move(0, -container.paddingBefore());
                clippingRect.expand(0, container.paddingBefore());
            } else {
                clippingRect.move(-container.paddingBefore(), 0);
                clippingRect.expand(container.paddingBefore(), 0);
            }
        }
        
        if (isLastRegionInRange) {
            if (flowThread()->isHorizontalWritingMode())
                clippingRect.expand(0, container.paddingAfter());
            else
                clippingRect.expand(container.paddingAfter(), 0);
        }
        
        if (flowThread()->isHorizontalWritingMode()) {
            clippingRect.move(-container.paddingStart(), 0);
            clippingRect.expand(container.paddingStart() + container.paddingEnd(), 0);
        } else {
            clippingRect.move(0, -container.paddingStart());
            clippingRect.expand(0, container.paddingStart() + container.paddingEnd());
        }
    }
    
    return clippingRect;
}