C++ FontCascade::fontMetrics方法代码示例

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 SVGInlineTextBox::paintDecorationWithStyle(GraphicsContext& context, TextDecoration decoration, const SVGTextFragment& fragment, RenderBoxModelObject& decorationRenderer)
{
    ASSERT(!m_paintingResource);
    ASSERT(m_paintingResourceMode != ApplyToDefaultMode);

    RenderStyle& decorationStyle = decorationRenderer.style();

    float scalingFactor = 1;
    FontCascade 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)));

    GraphicsContext* contextPtr = &context;
    if (acquirePaintingResource(contextPtr, scalingFactor, decorationRenderer, &decorationStyle))
        releasePaintingResource(contextPtr, &path);
}

void FullscreenVideoController::draw()
{
    auto bitmapDC = adoptGDIObject(::CreateCompatibleDC(HWndDC(m_hudWindow)));
    HGDIOBJ oldBitmap = SelectObject(bitmapDC.get(), m_bitmap.get());

    GraphicsContext context(bitmapDC.get(), true);

    context.save();

    // Draw the background
    IntSize outerRadius(borderRadius, borderRadius);
    IntRect outerRect(0, 0, windowWidth, windowHeight);
    IntSize innerRadius(borderRadius - borderThickness, borderRadius - borderThickness);
    IntRect innerRect(borderThickness, borderThickness, windowWidth - borderThickness * 2, windowHeight - borderThickness * 2);

    context.fillRoundedRect(FloatRoundedRect(outerRect, outerRadius, outerRadius, outerRadius, outerRadius), Color(borderColor));
    context.setCompositeOperation(CompositeCopy);
    context.fillRoundedRect(FloatRoundedRect(innerRect, innerRadius, innerRadius, innerRadius, innerRadius), Color(backgroundColor));

    // Draw the widgets
    m_playPauseButton.draw(context);
    m_volumeUpButton.draw(context);
    m_volumeSliderButton.draw(context);
    m_volumeDownButton.draw(context);
    m_timeSliderButton.draw(context);
    m_exitFullscreenButton.draw(context);
    m_volumeSlider.draw(context);
    m_timeSlider.draw(context);

    // Draw the text strings
    FontCascadeDescription desc;

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

    desc.setComputedSize(textSize);
    FontCascade font = FontCascade(desc, 0, 0);
    font.update(0);

    String s;

    // The y positioning of these two text strings is tricky because they are so small. They
    // are currently positioned relative to the center of the slider and then down the font
    // height / 4 (which is actually half of font height /2), which positions the center of
    // the text at the center of the slider.
    // Left string
    s = timeToString(currentTime());
    int fontHeight = font.fontMetrics().height();
    TextRun leftText(s);
    context.setFillColor(Color(textColor));
    context.drawText(font, leftText, IntPoint(windowWidth / 2 - timeSliderWidth / 2 - margin - font.width(leftText), windowHeight - margin - sliderHeight / 2 + fontHeight / 4));

    // Right string
    s = timeToString(currentTime() - duration());
    TextRun rightText(s);
    context.setFillColor(Color(textColor));
    context.drawText(font, rightText, IntPoint(windowWidth / 2 + timeSliderWidth / 2 + margin, windowHeight - margin - sliderHeight / 2 + fontHeight / 4));

    // Copy to the window
    BLENDFUNCTION blendFunction = {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA};
    SIZE size = { windowWidth, windowHeight };
    POINT sourcePoint = {0, 0};
    POINT destPoint = { m_hudPosition.x(), m_hudPosition.y() };
    BOOL result = UpdateLayeredWindow(m_hudWindow, 0, &destPoint, &size, bitmapDC.get(), &sourcePoint, 0, &blendFunction, ULW_ALPHA);

    context.restore();

    ::SelectObject(bitmapDC.get(), oldBitmap);
}

void PopupMenuWin::paint(const IntRect& damageRect, HDC hdc)
{
    if (!m_popup)
        return;

    if (!m_DC) {
        m_DC = adoptGDIObject(::CreateCompatibleDC(HWndDC(m_popup)));
        if (!m_DC)
            return;
    }

    if (m_bmp) {
        bool keepBitmap = false;
        BITMAP bitmap;
        if (::GetObject(m_bmp.get(), sizeof(bitmap), &bitmap))
            keepBitmap = bitmap.bmWidth == clientRect().width()
                         && bitmap.bmHeight == clientRect().height();
        if (!keepBitmap)
            m_bmp.clear();
    }
    if (!m_bmp) {
        BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(clientRect().size());
        void* pixels = 0;
        m_bmp = adoptGDIObject(::CreateDIBSection(m_DC.get(), &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0));
        if (!m_bmp)
            return;

        ::SelectObject(m_DC.get(), m_bmp.get());
    }

    GraphicsContext context(m_DC.get());

    int itemCount = client()->listSize();

    // listRect is the damageRect translated into the coordinates of the entire menu list (which is itemCount * m_itemHeight pixels tall)
    IntRect listRect = damageRect;
    listRect.move(IntSize(0, m_scrollOffset * m_itemHeight));

    for (int y = listRect.y(); y < listRect.maxY(); y += m_itemHeight) {
        int index = y / m_itemHeight;

        Color optionBackgroundColor, optionTextColor;
        PopupMenuStyle itemStyle = client()->itemStyle(index);
        if (index == focusedIndex()) {
            optionBackgroundColor = RenderTheme::defaultTheme()->activeListBoxSelectionBackgroundColor();
            optionTextColor = RenderTheme::defaultTheme()->activeListBoxSelectionForegroundColor();
        } else {
            optionBackgroundColor = itemStyle.backgroundColor();
            optionTextColor = itemStyle.foregroundColor();
        }

        // itemRect is in client coordinates
        IntRect itemRect(0, (index - m_scrollOffset) * m_itemHeight, damageRect.width(), m_itemHeight);

        // Draw the background for this menu item
        if (itemStyle.isVisible())
            context.fillRect(itemRect, optionBackgroundColor);

        if (client()->itemIsSeparator(index)) {
            IntRect separatorRect(itemRect.x() + separatorPadding, itemRect.y() + (itemRect.height() - separatorHeight) / 2, itemRect.width() - 2 * separatorPadding, separatorHeight);
            context.fillRect(separatorRect, optionTextColor);
            continue;
        }

        String itemText = client()->itemText(index);

        TextRun textRun(itemText, 0, 0, AllowTrailingExpansion, itemStyle.textDirection(), itemStyle.hasTextDirectionOverride());
        context.setFillColor(optionTextColor);

        FontCascade itemFont = client()->menuStyle().font();
        if (client()->itemIsLabel(index)) {
            auto d = itemFont.fontDescription();
            d.setWeight(d.bolderWeight());
            itemFont = FontCascade(d, itemFont.letterSpacing(), itemFont.wordSpacing());
            itemFont.update(m_popupClient->fontSelector());
        }

        // Draw the item text
        if (itemStyle.isVisible()) {
            int textX = 0;
            if (client()->menuStyle().textDirection() == LTR) {
                textX = std::max<int>(0, client()->clientPaddingLeft() - client()->clientInsetLeft());
                if (RenderTheme::defaultTheme()->popupOptionSupportsTextIndent())
                    textX += minimumIntValueForLength(itemStyle.textIndent(), itemRect.width());
            } else {
                textX = itemRect.width() - client()->menuStyle().font().width(textRun);
                textX = std::min<int>(textX, textX - client()->clientPaddingRight() + client()->clientInsetRight());
                if (RenderTheme::defaultTheme()->popupOptionSupportsTextIndent())
                    textX -= minimumIntValueForLength(itemStyle.textIndent(), itemRect.width());
            }
            int textY = itemRect.y() + itemFont.fontMetrics().ascent() + (itemRect.height() - itemFont.fontMetrics().height()) / 2;
            context.drawBidiText(itemFont, textRun, IntPoint(textX, textY));
        }
    }

    if (m_scrollbar)
        m_scrollbar->paint(context, damageRect);

    HWndDC hWndDC;
    HDC localDC = hdc ? hdc : hWndDC.setHWnd(m_popup);
//.........这里部分代码省略.........