Example #1
0
void RenderMathMLSquareRoot::layout()
{
    int maxHeight = 0;
    
    RenderObject* current = firstChild();
    while (current) {
        if (current->isBoxModelObject()) {
            RenderBoxModelObject* box = toRenderBoxModelObject(current);
            
            if (box->pixelSnappedOffsetHeight() > maxHeight)
                maxHeight = box->pixelSnappedOffsetHeight();
            
            box->style()->setVerticalAlign(BASELINE);
        }
        current = current->nextSibling();
    }
    
    if (!maxHeight)
        maxHeight = style()->fontSize();

    
    if (maxHeight > static_cast<int>(gThresholdBaseHeight * style()->fontSize()))
        style()->setPaddingBottom(Length(static_cast<int>(gRootBottomPadding * style()->fontSize()), Fixed));

    
    RenderBlock::layout();
}
void RenderMathMLRoot::layout()
{
    RenderBlock::layout();

    if (!firstChild() || !lastChild())
        return;

    int baseHeight = toRenderBoxModelObject(lastChild())->pixelSnappedOffsetHeight();
    if (!baseHeight)
        baseHeight = style()->fontSize();
    
    RenderObject* base = lastChild()->firstChild();
    if (base)
        base->style()->setVerticalAlign(BASELINE); // FIXME: Can this style be modified?
    
    // Base height above which the shape of the root changes
    int thresholdHeight = static_cast<int>(gThresholdBaseHeightEms * style()->fontSize());
    int overbarLeftPointShift = 0;
    
    // FIXME: Can style() and indexBox->style() be modified (4 times below)?
    if (baseHeight > thresholdHeight && thresholdHeight) {
        float shift = (baseHeight - thresholdHeight) / static_cast<float>(thresholdHeight);
        if (shift > 1.)
            shift = 1.0f;
        int frontWidth = static_cast<int>(style()->fontSize() * gFrontWidthEms);
        overbarLeftPointShift = static_cast<int>(gRadicalBottomPointXFront * frontWidth * shift);
        
        style()->setPaddingBottom(Length(static_cast<int>(gBigRootBottomPaddingEms * style()->fontSize()), Fixed));
    }
    
    // Positioning of the index
    RenderObject* possibleIndex = firstChild()->firstChild();
    while (possibleIndex && !possibleIndex->isBoxModelObject())
        possibleIndex = possibleIndex->nextSibling();
    RenderBoxModelObject* indexBox = toRenderBoxModelObject(possibleIndex);
    if (!indexBox)
        return;
    
    int shiftForIndex = indexBox->pixelSnappedOffsetWidth() + overbarLeftPointShift;
    int partDipHeight = static_cast<int>((1 - gRadicalDipLeftPointYPos) * baseHeight);
    int rootExtraTop = partDipHeight + style()->paddingBottom().value() + indexBox->pixelSnappedOffsetHeight()
        - (baseHeight + static_cast<int>(gRootPaddingEms * style()->fontSize()));
    
    style()->setPaddingLeft(Length(shiftForIndex, Fixed));
    if (rootExtraTop > 0)
        style()->setPaddingTop(Length(rootExtraTop + static_cast<int>(gRootPaddingEms * style()->fontSize()), Fixed));
    
    setNeedsLayout(true);
    setPreferredLogicalWidthsDirty(true, MarkOnlyThis); // FIXME: Can this really be right?
    RenderBlock::layout();

    indexBox->style()->setBottom(Length(partDipHeight + style()->paddingBottom().value(), Fixed));

    // Now that we've potentially changed its position, we need layout the index again.
    indexBox->setNeedsLayout(true);
    indexBox->layout();
}
void RenderMathMLRoot::layout()
{
    RenderBlock::layout();

    if (!firstChild() || !lastChild())
        return;

    int maxHeight = toRenderBoxModelObject(lastChild())->offsetHeight();
    
    RenderObject* current = lastChild()->firstChild();
    if (current)
        current->style()->setVerticalAlign(BASELINE);
    
    if (!maxHeight)
        maxHeight = style()->fontSize();
    
    // Base height above which the shape of the root changes
    int thresholdHeight = static_cast<int>(gThresholdBaseHeight * style()->fontSize());
    int topStartShift = 0;
    
    if (maxHeight > thresholdHeight && thresholdHeight) {
        float shift = (maxHeight - thresholdHeight) / static_cast<float>(thresholdHeight);
        if (shift > 1.)
            shift = 1.0f;
        int frontWidth = static_cast<int>(style()->fontSize() * gRadicalWidth);
        topStartShift = static_cast<int>(gRadicalBottomPointXPos * frontWidth * shift);
        
        style()->setPaddingBottom(Length(static_cast<int>(gRootBottomPadding * style()->fontSize()), Fixed));
    }
    
    // Positioning of the index
    RenderObject* possibleIndex = firstChild()->firstChild();
    while (possibleIndex && !possibleIndex->isBoxModelObject())
        possibleIndex = possibleIndex->nextSibling();
    RenderBoxModelObject* indexBox = toRenderBoxModelObject(possibleIndex);
    if (!indexBox)
        return;
    
    int indexShift = indexBox->offsetWidth() + topStartShift;
    int radicalHeight = static_cast<int>((1 - gRadicalTopLeftPointYPos) * maxHeight);
    int rootMarginTop = radicalHeight + style()->paddingBottom().value() + indexBox->offsetHeight() - (maxHeight + static_cast<int>(gRootPadding * style()->fontSize()));
    
    style()->setPaddingLeft(Length(indexShift, Fixed));
    if (rootMarginTop > 0)
        style()->setPaddingTop(Length(rootMarginTop + static_cast<int>(gRootPadding * style()->fontSize()), Fixed));
    
    setNeedsLayout(true);
    setPreferredLogicalWidthsDirty(true, false);
    RenderBlock::layout();

    indexBox->style()->setBottom(Length(radicalHeight + style()->paddingBottom().value(), Fixed));

    // Now that we've potentially changed its position, we need layout the index again.
    indexBox->setNeedsLayout(true);
    indexBox->layout();
}
Example #4
0
static inline RenderBoxModelObject& findRendererDefininingTextDecoration(InlineFlowBox* parentBox)
{
    // Lookup first render object in parent hierarchy which has text-decoration set.
    RenderBoxModelObject* renderer = nullptr;
    while (parentBox) {
        renderer = &parentBox->renderer();

        if (renderer->style()->textDecoration() != TextDecorationNone)
            break;

        parentBox = parentBox->parent();
    }

    ASSERT(renderer);
    return *renderer;
}
Example #5
0
void SVGInlineTextBox::paintDecorationWithStyle(GraphicsContext* context, TextDecoration decoration, const SVGTextFragment& fragment, RenderBoxModelObject& decorationRenderer)
{
    ASSERT(!m_paintingResource);
    ASSERT(m_paintingResourceMode != ApplyToDefaultMode);

    RenderStyle* decorationStyle = decorationRenderer.style();
    ASSERT(decorationStyle);

    float scalingFactor = 1;
    Font scaledFont;
    RenderSVGInlineText::computeNewScaledFontForStyle(&decorationRenderer, decorationStyle, scalingFactor, scaledFont);
    ASSERT(scalingFactor);

    // The initial y value refers to overline position.
    float thickness = thicknessForDecoration(decoration, scaledFont);

    if (fragment.width <= 0 && thickness <= 0)
        return;

    FloatPoint decorationOrigin(fragment.x, fragment.y);
    float width = fragment.width;
    const FontMetrics& scaledFontMetrics = scaledFont.fontMetrics();

    GraphicsContextStateSaver stateSaver(*context);
    if (scalingFactor != 1) {
        width *= scalingFactor;
        decorationOrigin.scale(scalingFactor, scalingFactor);
        context->scale(FloatSize(1 / scalingFactor, 1 / scalingFactor));
    }

    decorationOrigin.move(0, -scaledFontMetrics.floatAscent() + positionOffsetForDecoration(decoration, scaledFontMetrics, thickness));

    Path path;
    path.addRect(FloatRect(decorationOrigin, FloatSize(width, thickness)));

    if (acquirePaintingResource(context, scalingFactor, decorationRenderer, decorationStyle))
        releasePaintingResource(context, &path);
}
Example #6
0
void RootInlineBox::ascentAndDescentForBox(InlineBox* box, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, int& ascent, int& descent,
                                           bool& affectsAscent, bool& affectsDescent) const
{
    bool ascentDescentSet = false;

    // Replaced boxes will return 0 for the line-height if line-box-contain says they are
    // not to be included.
    if (box->renderer().isReplaced()) {
        if (lineStyle().lineBoxContain() & LineBoxContainReplaced) {
            ascent = box->baselinePosition(baselineType());
            descent = box->lineHeight() - ascent;
            
            // Replaced elements always affect both the ascent and descent.
            affectsAscent = true;
            affectsDescent = true;
        }
        return;
    }

    Vector<const SimpleFontData*>* usedFonts = 0;
    GlyphOverflow* glyphOverflow = 0;
    if (box->isInlineTextBox()) {
        GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(toInlineTextBox(box));
        usedFonts = it == textBoxDataMap.end() ? 0 : &it->value.first;
        glyphOverflow = it == textBoxDataMap.end() ? 0 : &it->value.second;
    }
        
    bool includeLeading = includeLeadingForBox(box);
    bool includeFont = includeFontForBox(box);
    
    bool setUsedFont = false;
    bool setUsedFontWithLeading = false;

    const RenderStyle& boxLineStyle = box->lineStyle();
#if PLATFORM(IOS)
    if (usedFonts && !usedFonts->isEmpty() && (includeFont || (boxLineStyle.lineHeight().isNegative() && includeLeading)) && !box->renderer().document().settings()->alwaysUseBaselineOfPrimaryFont()) {
#else
    if (usedFonts && !usedFonts->isEmpty() && (includeFont || (boxLineStyle.lineHeight().isNegative() && includeLeading))) {
#endif
        usedFonts->append(boxLineStyle.font().primaryFont());
        for (size_t i = 0; i < usedFonts->size(); ++i) {
            const FontMetrics& fontMetrics = usedFonts->at(i)->fontMetrics();
            int usedFontAscent = fontMetrics.ascent(baselineType());
            int usedFontDescent = fontMetrics.descent(baselineType());
            int halfLeading = (fontMetrics.lineSpacing() - fontMetrics.height()) / 2;
            int usedFontAscentAndLeading = usedFontAscent + halfLeading;
            int usedFontDescentAndLeading = fontMetrics.lineSpacing() - usedFontAscentAndLeading;
            if (includeFont) {
                setAscentAndDescent(ascent, descent, usedFontAscent, usedFontDescent, ascentDescentSet);
                setUsedFont = true;
            }
            if (includeLeading) {
                setAscentAndDescent(ascent, descent, usedFontAscentAndLeading, usedFontDescentAndLeading, ascentDescentSet);
                setUsedFontWithLeading = true;
            }
            if (!affectsAscent)
                affectsAscent = usedFontAscent - box->logicalTop() > 0;
            if (!affectsDescent)
                affectsDescent = usedFontDescent + box->logicalTop() > 0;
        }
    }

    // If leading is included for the box, then we compute that box.
    if (includeLeading && !setUsedFontWithLeading) {
        int ascentWithLeading = box->baselinePosition(baselineType());
        int descentWithLeading = box->lineHeight() - ascentWithLeading;
        setAscentAndDescent(ascent, descent, ascentWithLeading, descentWithLeading, ascentDescentSet);
        
        // Examine the font box for inline flows and text boxes to see if any part of it is above the baseline.
        // If the top of our font box relative to the root box baseline is above the root box baseline, then
        // we are contributing to the maxAscent value. Descent is similar. If any part of our font box is below
        // the root box's baseline, then we contribute to the maxDescent value.
        affectsAscent = ascentWithLeading - box->logicalTop() > 0;
        affectsDescent = descentWithLeading + box->logicalTop() > 0; 
    }
    
    if (includeFontForBox(box) && !setUsedFont) {
        int fontAscent = boxLineStyle.fontMetrics().ascent(baselineType());
        int fontDescent = boxLineStyle.fontMetrics().descent(baselineType());
        setAscentAndDescent(ascent, descent, fontAscent, fontDescent, ascentDescentSet);
        affectsAscent = fontAscent - box->logicalTop() > 0;
        affectsDescent = fontDescent + box->logicalTop() > 0; 
    }

    if (includeGlyphsForBox(box) && glyphOverflow && glyphOverflow->computeBounds) {
        setAscentAndDescent(ascent, descent, glyphOverflow->top, glyphOverflow->bottom, ascentDescentSet);
        affectsAscent = glyphOverflow->top - box->logicalTop() > 0;
        affectsDescent = glyphOverflow->bottom + box->logicalTop() > 0; 
        glyphOverflow->top = std::min(glyphOverflow->top, std::max(0, glyphOverflow->top - boxLineStyle.fontMetrics().ascent(baselineType())));
        glyphOverflow->bottom = std::min(glyphOverflow->bottom, std::max(0, glyphOverflow->bottom - boxLineStyle.fontMetrics().descent(baselineType())));
    }

    if (includeMarginForBox(box)) {
        LayoutUnit ascentWithMargin = boxLineStyle.fontMetrics().ascent(baselineType());
        LayoutUnit descentWithMargin = boxLineStyle.fontMetrics().descent(baselineType());
        if (box->parent() && !box->renderer().isTextOrLineBreak()) {
            ascentWithMargin += box->boxModelObject()->borderAndPaddingBefore() + box->boxModelObject()->marginBefore();
            descentWithMargin += box->boxModelObject()->borderAndPaddingAfter() + box->boxModelObject()->marginAfter();
        }
        setAscentAndDescent(ascent, descent, ascentWithMargin, descentWithMargin, ascentDescentSet);
        
        // Treat like a replaced element, since we're using the margin box.
        affectsAscent = true;
        affectsDescent = true;
    }
}

LayoutUnit RootInlineBox::verticalPositionForBox(InlineBox* box, VerticalPositionCache& verticalPositionCache)
{
    if (box->renderer().isTextOrLineBreak())
        return box->parent()->logicalTop();
    
    RenderBoxModelObject* renderer = box->boxModelObject();
    ASSERT(renderer->isInline());
    if (!renderer->isInline())
        return 0;

    // This method determines the vertical position for inline elements.
    bool firstLine = isFirstLine();
    if (firstLine && !renderer->document().styleSheetCollection().usesFirstLineRules())
        firstLine = false;

    // Check the cache.
    bool isRenderInline = renderer->isRenderInline();
    if (isRenderInline && !firstLine) {
        LayoutUnit verticalPosition = verticalPositionCache.get(renderer, baselineType());
        if (verticalPosition != PositionUndefined)
            return verticalPosition;
    }

    LayoutUnit verticalPosition = 0;
    EVerticalAlign verticalAlign = renderer->style().verticalAlign();
    if (verticalAlign == TOP || verticalAlign == BOTTOM)
        return 0;
   
    RenderElement* parent = renderer->parent();
    if (parent->isRenderInline() && parent->style().verticalAlign() != TOP && parent->style().verticalAlign() != BOTTOM)
        verticalPosition = box->parent()->logicalTop();
    
    if (verticalAlign != BASELINE) {
        const RenderStyle& parentLineStyle = firstLine ? parent->firstLineStyle() : parent->style();
        const Font& font = parentLineStyle.font();
        const FontMetrics& fontMetrics = font.fontMetrics();
        int fontSize = font.pixelSize();

        LineDirectionMode lineDirection = parent->isHorizontalWritingMode() ? HorizontalLine : VerticalLine;

        if (verticalAlign == SUB)
            verticalPosition += fontSize / 5 + 1;
        else if (verticalAlign == SUPER)
            verticalPosition -= fontSize / 3 + 1;
        else if (verticalAlign == TEXT_TOP)
            verticalPosition += renderer->baselinePosition(baselineType(), firstLine, lineDirection) - fontMetrics.ascent(baselineType());
        else if (verticalAlign == MIDDLE)
            verticalPosition = (verticalPosition - LayoutUnit(fontMetrics.xHeight() / 2) - renderer->lineHeight(firstLine, lineDirection) / 2 + renderer->baselinePosition(baselineType(), firstLine, lineDirection)).round();
        else if (verticalAlign == TEXT_BOTTOM) {
            verticalPosition += fontMetrics.descent(baselineType());
            // lineHeight - baselinePosition is always 0 for replaced elements (except inline blocks), so don't bother wasting time in that case.
            if (!renderer->isReplaced() || renderer->isInlineBlockOrInlineTable())
                verticalPosition -= (renderer->lineHeight(firstLine, lineDirection) - renderer->baselinePosition(baselineType(), firstLine, lineDirection));
        } else if (verticalAlign == BASELINE_MIDDLE)
            verticalPosition += -renderer->lineHeight(firstLine, lineDirection) / 2 + renderer->baselinePosition(baselineType(), firstLine, lineDirection);
        else if (verticalAlign == LENGTH) {
            LayoutUnit lineHeight;
            //Per http://www.w3.org/TR/CSS21/visudet.html#propdef-vertical-align: 'Percentages: refer to the 'line-height' of the element itself'.
            if (renderer->style().verticalAlignLength().isPercent())
                lineHeight = renderer->style().computedLineHeight();
            else
                lineHeight = renderer->lineHeight(firstLine, lineDirection);
            verticalPosition -= valueForLength(renderer->style().verticalAlignLength(), lineHeight);
        }
    }

    // Store the cached value.
    if (isRenderInline && !firstLine)
        verticalPositionCache.set(renderer, baselineType(), verticalPosition);

    return verticalPosition;
}

bool RootInlineBox::includeLeadingForBox(InlineBox* box) const
{
    if (box->renderer().isReplaced() || (box->renderer().isTextOrLineBreak() && !box->behavesLikeText()))
        return false;

    LineBoxContain lineBoxContain = renderer().style().lineBoxContain();
    return (lineBoxContain & LineBoxContainInline) || (box == this && (lineBoxContain & LineBoxContainBlock));
}

bool RootInlineBox::includeFontForBox(InlineBox* box) const
{
    if (box->renderer().isReplaced() || (box->renderer().isTextOrLineBreak() && !box->behavesLikeText()))
        return false;
    
    if (!box->behavesLikeText() && box->isInlineFlowBox() && !toInlineFlowBox(box)->hasTextChildren())
        return false;

    // For now map "glyphs" to "font" in vertical text mode until the bounds returned by glyphs aren't garbage.
    LineBoxContain lineBoxContain = renderer().style().lineBoxContain();
    return (lineBoxContain & LineBoxContainFont) || (!isHorizontal() && (lineBoxContain & LineBoxContainGlyphs));
}

bool RootInlineBox::includeGlyphsForBox(InlineBox* box) const
{
    if (box->renderer().isReplaced() || (box->renderer().isTextOrLineBreak() && !box->behavesLikeText()))
        return false;
    
    if (!box->behavesLikeText() && box->isInlineFlowBox() && !toInlineFlowBox(box)->hasTextChildren())
        return false;

    // FIXME: We can't fit to glyphs yet for vertical text, since the bounds returned are garbage.
    LineBoxContain lineBoxContain = renderer().style().lineBoxContain();
    return isHorizontal() && (lineBoxContain & LineBoxContainGlyphs);
}

bool RootInlineBox::includeMarginForBox(InlineBox* box) const
{
    if (box->renderer().isReplaced() || (box->renderer().isTextOrLineBreak() && !box->behavesLikeText()))
        return false;

    LineBoxContain lineBoxContain = renderer().style().lineBoxContain();
    return lineBoxContain & LineBoxContainInlineBox;
}


bool RootInlineBox::fitsToGlyphs() const
{
    // FIXME: We can't fit to glyphs yet for vertical text, since the bounds returned are garbage.
    LineBoxContain lineBoxContain = renderer().style().lineBoxContain();
    return isHorizontal() && (lineBoxContain & LineBoxContainGlyphs);
}