C++ FloatSize类代码示例

void Path::translate(const FloatSize& size)
{
    QTransform matrix;
    matrix.translate(size.width(), size.height());
    m_path = m_path * matrix;
}

void Path::addBeziersForRoundedRect(const FloatRect& rect, const FloatSize& topLeftRadius, const FloatSize& topRightRadius, const FloatSize& bottomLeftRadius, const FloatSize& bottomRightRadius)
{
    moveTo(FloatPoint(rect.x() + topLeftRadius.width(), rect.y()));

    addLineTo(FloatPoint(rect.maxX() - topRightRadius.width(), rect.y()));
    if (topRightRadius.width() > 0 || topRightRadius.height() > 0)
        addBezierCurveTo(FloatPoint(rect.maxX() - topRightRadius.width() * gCircleControlPoint, rect.y()),
            FloatPoint(rect.maxX(), rect.y() + topRightRadius.height() * gCircleControlPoint),
            FloatPoint(rect.maxX(), rect.y() + topRightRadius.height()));
    addLineTo(FloatPoint(rect.maxX(), rect.maxY() - bottomRightRadius.height()));
    if (bottomRightRadius.width() > 0 || bottomRightRadius.height() > 0)
        addBezierCurveTo(FloatPoint(rect.maxX(), rect.maxY() - bottomRightRadius.height() * gCircleControlPoint),
            FloatPoint(rect.maxX() - bottomRightRadius.width() * gCircleControlPoint, rect.maxY()),
            FloatPoint(rect.maxX() - bottomRightRadius.width(), rect.maxY()));
    addLineTo(FloatPoint(rect.x() + bottomLeftRadius.width(), rect.maxY()));
    if (bottomLeftRadius.width() > 0 || bottomLeftRadius.height() > 0)
        addBezierCurveTo(FloatPoint(rect.x() + bottomLeftRadius.width() * gCircleControlPoint, rect.maxY()),
            FloatPoint(rect.x(), rect.maxY() - bottomLeftRadius.height() * gCircleControlPoint),
            FloatPoint(rect.x(), rect.maxY() - bottomLeftRadius.height()));
    addLineTo(FloatPoint(rect.x(), rect.y() + topLeftRadius.height()));
    if (topLeftRadius.width() > 0 || topLeftRadius.height() > 0)
        addBezierCurveTo(FloatPoint(rect.x(), rect.y() + topLeftRadius.height() * gCircleControlPoint),
            FloatPoint(rect.x() + topLeftRadius.width() * gCircleControlPoint, rect.y()),
            FloatPoint(rect.x() + topLeftRadius.width(), rect.y()));

    closeSubpath();
}

float computeMinimumScaleFactorForContentContained(const ViewportAttributes& result, const IntSize& visibleViewport, const IntSize& contentsSize, float devicePixelRatio)
{
    FloatSize viewportSize = convertToUserSpace(visibleViewport, devicePixelRatio);

    return max<float>(result.minimumScale, max(viewportSize.width() / contentsSize.width(), viewportSize.height() / contentsSize.height()));
}

static inline int resolveHeightForRatio(int width, const FloatSize& intrinsicRatio)
{
    return ceilf(width * intrinsicRatio.height() / intrinsicRatio.width());
}

void Image::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
{
    intrinsicRatio = size();
    intrinsicWidth = Length(intrinsicRatio.width(), Fixed);
    intrinsicHeight = Length(intrinsicRatio.height(), Fixed);
}

static PassOwnPtr<Shape> createEllipseShape(const FloatPoint& center, const FloatSize& radii)
{
    ASSERT(radii.width() >= 0 && radii.height() >= 0);
    return adoptPtr(new RectangleShape(FloatRect(center.x() - radii.width(), center.y() - radii.height(), radii.width()*2, radii.height()*2), radii));
}

void PrintContext::computePageRectsWithPageSizeInternal(const FloatSize& pageSizeInPixels, bool allowInlineDirectionTiling)
{
    if (!m_frame->document() || !m_frame->view() || !m_frame->document()->renderView())
        return;

    RenderView* view = m_frame->document()->renderView();

    IntRect docRect = view->documentRect();

    int pageWidth = pageSizeInPixels.width();
    int pageHeight = pageSizeInPixels.height();

    bool isHorizontal = view->style()->isHorizontalWritingMode();

    int docLogicalHeight = isHorizontal ? docRect.height() : docRect.width();
    int pageLogicalHeight = isHorizontal ? pageHeight : pageWidth;
    int pageLogicalWidth = isHorizontal ? pageWidth : pageHeight;

    int inlineDirectionStart;
    int inlineDirectionEnd;
    int blockDirectionStart;
    int blockDirectionEnd;
    if (isHorizontal) {
        if (view->style()->isFlippedBlocksWritingMode()) {
            blockDirectionStart = docRect.maxY();
            blockDirectionEnd = docRect.y();
        } else {
            blockDirectionStart = docRect.y();
            blockDirectionEnd = docRect.maxY();
        }
        inlineDirectionStart = view->style()->isLeftToRightDirection() ? docRect.x() : docRect.maxX();
        inlineDirectionEnd = view->style()->isLeftToRightDirection() ? docRect.maxX() : docRect.x();
    } else {
        if (view->style()->isFlippedBlocksWritingMode()) {
            blockDirectionStart = docRect.maxX();
            blockDirectionEnd = docRect.x();
        } else {
            blockDirectionStart = docRect.x();
            blockDirectionEnd = docRect.maxX();
        }
        inlineDirectionStart = view->style()->isLeftToRightDirection() ? docRect.y() : docRect.maxY();
        inlineDirectionEnd = view->style()->isLeftToRightDirection() ? docRect.maxY() : docRect.y();
    }

    unsigned pageCount = ceilf((float)docLogicalHeight / pageLogicalHeight);
    for (unsigned i = 0; i < pageCount; ++i) {
        int pageLogicalTop = blockDirectionEnd > blockDirectionStart ?
                                blockDirectionStart + i * pageLogicalHeight :
                                blockDirectionStart - (i + 1) * pageLogicalHeight;
        if (allowInlineDirectionTiling) {
            for (int currentInlinePosition = inlineDirectionStart;
                 inlineDirectionEnd > inlineDirectionStart ? currentInlinePosition < inlineDirectionEnd : currentInlinePosition > inlineDirectionEnd;
                 currentInlinePosition += (inlineDirectionEnd > inlineDirectionStart ? pageLogicalWidth : -pageLogicalWidth)) {
                int pageLogicalLeft = inlineDirectionEnd > inlineDirectionStart ? currentInlinePosition : currentInlinePosition - pageLogicalWidth;
                IntRect pageRect(pageLogicalLeft, pageLogicalTop, pageLogicalWidth, pageLogicalHeight);
                if (!isHorizontal)
                    pageRect = pageRect.transposedRect();
                m_pageRects.append(pageRect);
            }
        } else {
            int pageLogicalLeft = inlineDirectionEnd > inlineDirectionStart ? inlineDirectionStart : inlineDirectionStart - pageLogicalWidth;
            IntRect pageRect(pageLogicalLeft, pageLogicalTop, pageLogicalWidth, pageLogicalHeight);
            if (!isHorizontal)
                pageRect = pageRect.transposedRect();
            m_pageRects.append(pageRect);
        }
    }
}

inline static float perpProduct(const FloatSize& u, const FloatSize& v)
{
    return u.width() * v.height() - u.height() * v.width();
}

inline static float innerProduct(const FloatSize& u, const FloatSize& v)
{
    return u.width() * v.width() + u.height() * v.height();
}

void Path::translate(const FloatSize& size)
{
    AffineTransform transformation;
    transformation.translate(size.width(), size.height());
    transform(transformation);
}

static Frame* createWindow(Frame* openerFrame, Frame* lookupFrame, const FrameLoadRequest& request, const WindowFeatures& features, NavigationPolicy policy, ShouldSendReferrer shouldSendReferrer, bool& created)
{
    ASSERT(!features.dialog || request.frameName().isEmpty());

    if (!request.frameName().isEmpty() && request.frameName() != "_blank" && policy == NavigationPolicyIgnore) {
        if (Frame* frame = lookupFrame->loader().findFrameForNavigation(request.frameName(), openerFrame->document())) {
            if (request.frameName() != "_self")
                frame->page()->focusController().setFocusedFrame(frame);
            created = false;
            return frame;
        }
    }

    // Sandboxed frames cannot open new auxiliary browsing contexts.
    if (openerFrame->document()->isSandboxed(SandboxPopups)) {
        // FIXME: This message should be moved off the console once a solution to https://bugs.webkit.org/show_bug.cgi?id=103274 exists.
        openerFrame->document()->addConsoleMessage(SecurityMessageSource, ErrorMessageLevel, "Blocked opening '" + request.resourceRequest().url().elidedString() + "' in a new window because the request was made in a sandboxed frame whose 'allow-popups' permission is not set.");
        return 0;
    }

    if (openerFrame->settings() && !openerFrame->settings()->supportsMultipleWindows()) {
        created = false;
        return openerFrame->tree().top();
    }

    Page* oldPage = openerFrame->page();
    if (!oldPage)
        return 0;

    Page* page = oldPage->chrome().client().createWindow(openerFrame, request, features, policy, shouldSendReferrer);
    if (!page)
        return 0;
    FrameHost* host = &page->frameHost();

    Frame* frame = page->mainFrame();

    frame->loader().forceSandboxFlags(openerFrame->document()->sandboxFlags());

    if (request.frameName() != "_blank")
        frame->tree().setName(request.frameName());

    host->chrome().setWindowFeatures(features);

    // 'x' and 'y' specify the location of the window, while 'width' and 'height'
    // specify the size of the viewport. We can only resize the window, so adjust
    // for the difference between the window size and the viewport size.

    FloatRect windowRect = host->chrome().windowRect();
    FloatSize viewportSize = host->chrome().pageRect().size();

    if (features.xSet)
        windowRect.setX(features.x);
    if (features.ySet)
        windowRect.setY(features.y);
    if (features.widthSet)
        windowRect.setWidth(features.width + (windowRect.width() - viewportSize.width()));
    if (features.heightSet)
        windowRect.setHeight(features.height + (windowRect.height() - viewportSize.height()));

    // Ensure non-NaN values, minimum size as well as being within valid screen area.
    FloatRect newWindowRect = DOMWindow::adjustWindowRect(frame, windowRect);

    host->chrome().setWindowRect(newWindowRect);
    host->chrome().show(policy);

    created = true;
    return frame;
}

FloatSize HTMLCanvasElement::convertDeviceToLogical(const FloatSize& deviceSize) const
{
    float width = ceilf(deviceSize.width() / m_deviceScaleFactor);
    float height = ceilf(deviceSize.height() / m_deviceScaleFactor);
    return FloatSize(width, height);
}

static inline float determinant(const FloatSize& a, const FloatSize& b)
{
    return a.width() * b.height() - a.height() * b.width();
}

PageScaleConstraints ViewportDescription::resolve(const FloatSize& initialViewportSize, Length legacyFallbackWidth) const
{
    float resultWidth = ValueAuto;

    Length copyMaxWidth = maxWidth;
    Length copyMinWidth = minWidth;
    // In case the width (used for min- and max-width) is undefined.
    if (isLegacyViewportType() && maxWidth.isAuto()) {
        // The width viewport META property is translated into 'width' descriptors, setting
        // the 'min' value to 'extend-to-zoom' and the 'max' value to the intended length.
        // In case the UA-defines a min-width, use that as length.
        if (zoom == ViewportDescription::ValueAuto) {
            copyMinWidth = Length(ExtendToZoom);
            copyMaxWidth = legacyFallbackWidth;
        } else if (maxHeight.isAuto()) {
            copyMinWidth = Length(ExtendToZoom);
            copyMaxWidth = Length(ExtendToZoom);
        }
    }

    float resultMaxWidth = resolveViewportLength(copyMaxWidth, initialViewportSize, Horizontal);
    float resultMinWidth = resolveViewportLength(copyMinWidth, initialViewportSize, Horizontal);

    float resultHeight = ValueAuto;
    float resultMaxHeight = resolveViewportLength(maxHeight, initialViewportSize, Vertical);
    float resultMinHeight = resolveViewportLength(minHeight, initialViewportSize, Vertical);

    float resultZoom = zoom;
    float resultMinZoom = minZoom;
    float resultMaxZoom = maxZoom;
    bool resultUserZoom = userZoom;

    // 1. Resolve min-zoom and max-zoom values.
    if (resultMinZoom != ViewportDescription::ValueAuto && resultMaxZoom != ViewportDescription::ValueAuto)
        resultMaxZoom = std::max(resultMinZoom, resultMaxZoom);

    // 2. Constrain zoom value to the [min-zoom, max-zoom] range.
    if (resultZoom != ViewportDescription::ValueAuto)
        resultZoom = compareIgnoringAuto(resultMinZoom, compareIgnoringAuto(resultMaxZoom, resultZoom, std::min), std::max);

    float extendZoom = compareIgnoringAuto(resultZoom, resultMaxZoom, std::min);

    // 3. Resolve non-"auto" lengths to pixel lengths.
    if (extendZoom == ViewportDescription::ValueAuto) {
        if (resultMaxWidth == ViewportDescription::ValueExtendToZoom)
            resultMaxWidth = ViewportDescription::ValueAuto;

        if (resultMaxHeight == ViewportDescription::ValueExtendToZoom)
            resultMaxHeight = ViewportDescription::ValueAuto;

        if (resultMinWidth == ViewportDescription::ValueExtendToZoom)
            resultMinWidth = resultMaxWidth;

        if (resultMinHeight == ViewportDescription::ValueExtendToZoom)
            resultMinHeight = resultMaxHeight;
    } else {
        float extendWidth = initialViewportSize.width() / extendZoom;
        float extendHeight = initialViewportSize.height() / extendZoom;

        if (resultMaxWidth == ViewportDescription::ValueExtendToZoom)
            resultMaxWidth = extendWidth;

        if (resultMaxHeight == ViewportDescription::ValueExtendToZoom)
            resultMaxHeight = extendHeight;

        if (resultMinWidth == ViewportDescription::ValueExtendToZoom)
            resultMinWidth = compareIgnoringAuto(extendWidth, resultMaxWidth, std::max);

        if (resultMinHeight == ViewportDescription::ValueExtendToZoom)
            resultMinHeight = compareIgnoringAuto(extendHeight, resultMaxHeight, std::max);
    }

    // 4. Resolve initial width from min/max descriptors.
    if (resultMinWidth != ViewportDescription::ValueAuto || resultMaxWidth != ViewportDescription::ValueAuto)
        resultWidth = compareIgnoringAuto(resultMinWidth, compareIgnoringAuto(resultMaxWidth, initialViewportSize.width(), std::min), std::max);

    // 5. Resolve initial height from min/max descriptors.
    if (resultMinHeight != ViewportDescription::ValueAuto || resultMaxHeight != ViewportDescription::ValueAuto)
        resultHeight = compareIgnoringAuto(resultMinHeight, compareIgnoringAuto(resultMaxHeight, initialViewportSize.height(), std::min), std::max);

    // 6-7. Resolve width value.
    if (resultWidth == ViewportDescription::ValueAuto) {
        if (resultHeight == ViewportDescription::ValueAuto || !initialViewportSize.height())
            resultWidth = initialViewportSize.width();
        else
            resultWidth = resultHeight * (initialViewportSize.width() / initialViewportSize.height());
    }

    // 8. Resolve height value.
    if (resultHeight == ViewportDescription::ValueAuto) {
        if (!initialViewportSize.width())
            resultHeight = initialViewportSize.height();
        else
            resultHeight = resultWidth * initialViewportSize.height() / initialViewportSize.width();
    }

    // Resolve initial-scale value.
    if (resultZoom == ViewportDescription::ValueAuto) {
        if (resultWidth != ViewportDescription::ValueAuto && resultWidth > 0)
            resultZoom = initialViewportSize.width() / resultWidth;
//.........这里部分代码省略.........

ViewportAttributes ViewportArguments::resolve(const FloatSize& initialViewportSize, const FloatSize& deviceSize, int defaultWidth) const
{
    float resultWidth = width;
    float resultMaxWidth = maxWidth;
    float resultMinWidth = minWidth;
    float resultHeight = height;
    float resultMinHeight = minHeight;
    float resultMaxHeight = maxHeight;
    float resultZoom = zoom;
    float resultMinZoom = minZoom;
    float resultMaxZoom = maxZoom;
    float resultUserZoom = userZoom;

    switch (int(resultWidth)) {
    case ViewportArguments::ValueDeviceWidth:
        resultWidth = deviceSize.width();
        break;
    case ViewportArguments::ValueDeviceHeight:
        resultWidth = deviceSize.height();
        break;
    }

    switch (int(resultHeight)) {
    case ViewportArguments::ValueDeviceWidth:
        resultHeight = deviceSize.width();
        break;
    case ViewportArguments::ValueDeviceHeight:
        resultHeight = deviceSize.height();
        break;
    }

    if (type == ViewportArguments::CSSDeviceAdaptation) {
        switch (int(resultMinWidth)) {
        case ViewportArguments::ValueDeviceWidth:
            resultMinWidth = deviceSize.width();
            break;
        case ViewportArguments::ValueDeviceHeight:
            resultMinWidth = deviceSize.height();
            break;
        }

        switch (int(resultMaxWidth)) {
        case ViewportArguments::ValueDeviceWidth:
            resultMaxWidth = deviceSize.width();
            break;
        case ViewportArguments::ValueDeviceHeight:
            resultMaxWidth = deviceSize.height();
            break;
        }

        switch (int(resultMinHeight)) {
        case ViewportArguments::ValueDeviceWidth:
            resultMinHeight = deviceSize.width();
            break;
        case ViewportArguments::ValueDeviceHeight:
            resultMinHeight = deviceSize.height();
            break;
        }

        switch (int(resultMaxHeight)) {
        case ViewportArguments::ValueDeviceWidth:
            resultMaxHeight = deviceSize.width();
            break;
        case ViewportArguments::ValueDeviceHeight:
            resultMaxHeight = deviceSize.height();
            break;
        }

        if (resultMinWidth != ViewportArguments::ValueAuto || resultMaxWidth != ViewportArguments::ValueAuto)
            resultWidth = compareIgnoringAuto(resultMinWidth, compareIgnoringAuto(resultMaxWidth, deviceSize.width(), std::min), std::max);

        if (resultMinHeight != ViewportArguments::ValueAuto || resultMaxHeight != ViewportArguments::ValueAuto)
            resultHeight = compareIgnoringAuto(resultMinHeight, compareIgnoringAuto(resultMaxHeight, deviceSize.height(), std::min), std::max);

        if (resultMinZoom != ViewportArguments::ValueAuto && resultMaxZoom != ViewportArguments::ValueAuto)
            resultMaxZoom = std::max(resultMinZoom, resultMaxZoom);

        if (resultZoom != ViewportArguments::ValueAuto)
            resultZoom = compareIgnoringAuto(resultMinZoom, compareIgnoringAuto(resultMaxZoom, resultZoom, std::min), std::max);

        if (resultWidth == ViewportArguments::ValueAuto && resultZoom == ViewportArguments::ValueAuto)
            resultWidth = deviceSize.width();

        if (resultWidth == ViewportArguments::ValueAuto && resultHeight == ViewportArguments::ValueAuto)
            resultWidth = deviceSize.width() / resultZoom;

        if (resultWidth == ViewportArguments::ValueAuto)
            resultWidth = resultHeight * deviceSize.width() / deviceSize.height();

        if (resultHeight == ViewportArguments::ValueAuto)
            resultHeight = resultWidth * deviceSize.height() / deviceSize.width();

        if (resultZoom != ViewportArguments::ValueAuto || resultMaxZoom != ViewportArguments::ValueAuto) {
            resultWidth = compareIgnoringAuto(resultWidth, deviceSize.width() / compareIgnoringAuto(resultZoom, resultMaxZoom, std::min), std::max);
            resultHeight = compareIgnoringAuto(resultHeight, deviceSize.height() / compareIgnoringAuto(resultZoom, resultMaxZoom, std::min), std::max);
        }

        resultWidth = std::max<float>(1, resultWidth);
        resultHeight = std::max<float>(1, resultHeight);
    }
//.........这里部分代码省略.........