C++ FontCascade类代码示例

bool RenderEmbeddedObject::getReplacementTextGeometry(const LayoutPoint& accumulatedOffset, FloatRect& contentRect, FloatRect& indicatorRect, FloatRect& replacementTextRect, FloatRect& arrowRect, FontCascade& font, TextRun& run, float& textWidth) const
{
    bool includesArrow = shouldUnavailablePluginMessageBeButton(document(), m_pluginUnavailabilityReason);

    contentRect = contentBoxRect();
    contentRect.moveBy(roundedIntPoint(accumulatedOffset));

    FontCascadeDescription fontDescription;
    RenderTheme::defaultTheme()->systemFont(CSSValueWebkitSmallControl, fontDescription);
    fontDescription.setWeight(FontWeightBold);
    fontDescription.setRenderingMode(frame().settings().fontRenderingMode());
    fontDescription.setComputedSize(12);
    font = FontCascade(fontDescription, 0, 0);
    font.update(0);

    run = TextRun(m_unavailablePluginReplacementText);
    textWidth = font.width(run);

    replacementTextRect.setSize(FloatSize(textWidth + replacementTextRoundedRectLeftTextMargin + (includesArrow ? replacementTextRoundedRectRightTextMarginWithArrow : replacementTextRoundedRectRightTextMargin), replacementTextRoundedRectHeight));
    float x = (contentRect.size().width() / 2 - replacementTextRect.size().width() / 2) + contentRect.location().x();
    float y = (contentRect.size().height() / 2 - replacementTextRect.size().height() / 2) + contentRect.location().y();
    replacementTextRect.setLocation(FloatPoint(x, y));

    indicatorRect = replacementTextRect;

    // Expand the background rect to include the arrow, if it will be used.
    if (includesArrow) {
        arrowRect = indicatorRect;
        arrowRect.setX(ceilf(arrowRect.maxX() + replacementArrowLeftMargin));
        arrowRect.setWidth(arrowRect.height());
        indicatorRect.unite(arrowRect);
    }

    return true;
}

static void doDrawTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const FontCascade& font, const Color& color, int underlinedIndex)
{
    TextRun run(text);

    context.setFillColor(color);
    if (isOneLeftToRightRun(run))
        font.drawText(context, run, point);
    else
        context.drawBidiText(font, run, point);

    if (underlinedIndex >= 0) {
        ASSERT_WITH_SECURITY_IMPLICATION(underlinedIndex < static_cast<int>(text.length()));

        int beforeWidth;
        if (underlinedIndex > 0) {
            TextRun beforeRun(StringView(text).substring(0, underlinedIndex));
            beforeWidth = font.width(beforeRun);
        } else
            beforeWidth = 0;

        TextRun underlinedRun(StringView(text).substring(underlinedIndex, 1));
        int underlinedWidth = font.width(underlinedRun);

        IntPoint underlinePoint(point);
        underlinePoint.move(beforeWidth, 1);

        context.setStrokeColor(color);
        context.drawLineForText(underlinePoint, underlinedWidth, false);
    }
}

void RenderEmbeddedObject::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (!showsUnavailablePluginIndicator())
        return;

    if (paintInfo.phase == PaintPhaseSelection)
        return;

    GraphicsContext& context = paintInfo.context();
    if (context.paintingDisabled())
        return;

    FloatRect contentRect;
    FloatRect indicatorRect;
    FloatRect replacementTextRect;
    FloatRect arrowRect;
    FontCascade font;
    TextRun run(emptyString());
    float textWidth;
    if (!getReplacementTextGeometry(paintOffset, contentRect, indicatorRect, replacementTextRect, arrowRect, font, run, textWidth))
        return;

    Path background;
    background.addRoundedRect(indicatorRect, FloatSize(replacementTextRoundedRectRadius, replacementTextRoundedRectRadius));

    GraphicsContextStateSaver stateSaver(context);
    context.clip(contentRect);
    context.setFillColor(m_unavailablePluginIndicatorIsPressed ? replacementTextRoundedRectPressedColor() : replacementTextRoundedRectColor());
    context.fillPath(background);

    Path strokePath;
    FloatRect strokeRect(indicatorRect);
    strokeRect.inflate(1);
    strokePath.addRoundedRect(strokeRect, FloatSize(replacementTextRoundedRectRadius + 1, replacementTextRoundedRectRadius + 1));

    context.setStrokeColor(unavailablePluginBorderColor());
    context.setStrokeThickness(2);
    context.strokePath(strokePath);

    const FontMetrics& fontMetrics = font.fontMetrics();
    float labelX = roundf(replacementTextRect.location().x() + replacementTextRoundedRectLeftTextMargin);
    float labelY = roundf(replacementTextRect.location().y() + (replacementTextRect.size().height() - fontMetrics.height()) / 2 + fontMetrics.ascent() + replacementTextRoundedRectTopTextMargin);
    context.setFillColor(replacementTextColor());
    context.drawBidiText(font, run, FloatPoint(labelX, labelY));

    if (shouldUnavailablePluginMessageBeButton(document(), m_pluginUnavailabilityReason)) {
        arrowRect.inflate(-replacementArrowCirclePadding);

        context.beginTransparencyLayer(1.0);
        context.setFillColor(replacementTextColor());
        context.fillEllipse(arrowRect);

        context.setCompositeOperation(CompositeClear);
        drawReplacementArrow(context, arrowRect);
        context.endTransparencyLayer();
    }
}

void GraphicsContext::drawGlyphs(const FontCascade& fontCascade, const Font& font, const GlyphBuffer& buffer, int from, int numGlyphs, const FloatPoint& point)
{
    if (paintingDisabled())
        return;

    if (isRecording()) {
        m_displayListRecorder->drawGlyphs(font, buffer, from, numGlyphs, point, fontCascade.fontDescription().fontSmoothing());
        return;
    }

    fontCascade.drawGlyphs(*this, font, buffer, from, numGlyphs, point, fontCascade.fontDescription().fontSmoothing());
}

bool FontLoader::checkFont(const String& fontString, const String&)
{
    // FIXME: The second parameter (text) is ignored.
    FontCascade font;
    if (!resolveFontStyle(fontString, font))
        return false;
    for (unsigned i = 0; i < font.familyCount(); i++) {
        CSSSegmentedFontFace* face = m_document->fontSelector().getFontFace(font.fontDescription(), font.familyAt(i));
        if (!face || !face->checkFont())
            return false;
    }
    return true;
}

float RenderCombineText::width(unsigned from, unsigned length, const FontCascade& font, float xPosition, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
    if (m_isCombined)
        return font.size();

    return RenderText::width(from, length, font, xPosition, fallbackFonts, glyphOverflow);
}

float GraphicsContext::drawText(const FontCascade& font, const TextRun& run, const FloatPoint& point, int from, int to)
{
    if (paintingDisabled())
        return 0;

    return font.drawText(*this, run, point, from, to);
}

void GraphicsContext::drawGlyphs(const FontCascade& fontCascade, const Font& font, const GlyphBuffer& buffer, int from, int numGlyphs, const FloatPoint& point)
{
    if (paintingDisabled())
        return;

    fontCascade.drawGlyphs(*this, font, buffer, from, numGlyphs, point);
}

void GraphicsContext::drawEmphasisMarks(const FontCascade& font, const TextRun& run, const AtomicString& mark, const FloatPoint& point, int from, int to)
{
    if (paintingDisabled())
        return;

    font.drawEmphasisMarks(*this, run, mark, point, from, to);
}

void GraphicsContext::drawBidiText(const FontCascade& font, const TextRun& run, const FloatPoint& point, FontCascade::CustomFontNotReadyAction customFontNotReadyAction)
{
    if (paintingDisabled())
        return;

    BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
    bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
    bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));

    // FIXME: This ownership should be reversed. We should pass BidiRunList
    // to BidiResolver in createBidiRunsForLine.
    BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
    bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()));

    if (!bidiRuns.runCount())
        return;

    FloatPoint currPoint = point;
    BidiCharacterRun* bidiRun = bidiRuns.firstRun();
    while (bidiRun) {
        TextRun subrun = run.subRun(bidiRun->start(), bidiRun->stop() - bidiRun->start());
        bool isRTL = bidiRun->level() % 2;
        subrun.setDirection(isRTL ? RTL : LTR);
        subrun.setDirectionalOverride(bidiRun->dirOverride(false));

        float width = font.drawText(*this, subrun, currPoint, 0, -1, customFontNotReadyAction);
        currPoint.move(width, 0);

        bidiRun = bidiRun->next();
    }

    bidiRuns.deleteRuns();
}

static float stringWidth(const FontCascade& renderer, const UChar* characters, unsigned length, bool disableRoundingHacks)
{
    TextRun run(characters, length);
    if (disableRoundingHacks)
        run.disableRoundingHacks();
    return renderer.width(run);
}

static FontCascade dragLabelFont(int size, bool bold, FontRenderingMode renderingMode)
{
    FontCascade result;
    NONCLIENTMETRICS metrics;
    metrics.cbSize = sizeof(metrics);
    SystemParametersInfo(SPI_GETNONCLIENTMETRICS, metrics.cbSize, &metrics, 0);

    FontCascadeDescription description;
    description.setWeight(bold ? FontWeightBold : FontWeightNormal);
    description.setOneFamily(metrics.lfSmCaptionFont.lfFaceName);
    description.setSpecifiedSize((float)size);
    description.setComputedSize((float)size);
    description.setRenderingMode(renderingMode);
    result = FontCascade(description, 0, 0);
    result.update(0);
    return result;
}

void PlatformCALayerWin::drawTextAtPoint(CGContextRef context, CGFloat x, CGFloat y, CGSize scale, CGFloat fontSize, const char* message, size_t length) const
{
    String text(message, length);

    FontCascadeDescription desc;

    NONCLIENTMETRICS metrics;
    metrics.cbSize = sizeof(metrics);
    SystemParametersInfo(SPI_GETNONCLIENTMETRICS, metrics.cbSize, &metrics, 0);
    desc.setOneFamily(metrics.lfSmCaptionFont.lfFaceName);

    desc.setComputedSize(scale.width * fontSize);

    FontCascade font = FontCascade(desc, 0, 0);
    font.update(nullptr);

    GraphicsContext cg(context);
    cg.setFillColor(Color::black, ColorSpaceDeviceRGB);
    cg.drawText(font, TextRun(text), IntPoint(x, y));
}

static void drawSkipInkUnderline(GraphicsContext& context, const FontCascade& font, const TextRun& textRun, const FloatPoint& textOrigin, const FloatPoint& localOrigin,
    float underlineOffset, float width, bool isPrinting, bool doubleLines, StrokeStyle strokeStyle)
{
    FloatPoint adjustedLocalOrigin = localOrigin;
    adjustedLocalOrigin.move(0, underlineOffset);
    FloatRect underlineBoundingBox = context.computeUnderlineBoundsForText(adjustedLocalOrigin, width, isPrinting);
    DashArray intersections = font.dashesForIntersectionsWithRect(textRun, textOrigin, underlineBoundingBox);
    DashArray a = translateIntersectionPointsToSkipInkBoundaries(intersections, underlineBoundingBox.height(), width);
    ASSERT(!(a.size() % 2));
    context.drawLinesForText(adjustedLocalOrigin, a, isPrinting, doubleLines, strokeStyle);
}

 static PassRefPtr<LoadFontCallback> createFromParams(const Dictionary& params, FontLoader& fontLoader, const FontCascade& font)
 {
     RefPtr<VoidCallback> onsuccess;
     RefPtr<VoidCallback> onerror;
     params.get("onsuccess", onsuccess);
     params.get("onerror", onerror);
     if (!onsuccess && !onerror)
         return 0;
     int numFamilies = font.familyCount();
     return LoadFontCallback::create(numFamilies, fontLoader, onsuccess, onerror);
 }