C++ (Cpp) screenHorizontalDPI Examples

Example #1

void ChromeClientImpl::dispatchViewportPropertiesDidChange(const ViewportArguments& arguments) const
{
#if ENABLE(VIEWPORT)
    if (!m_webView->settings()->viewportEnabled() || !m_webView->isFixedLayoutModeEnabled() || !m_webView->client() || !m_webView->page())
        return;

    ViewportArguments args;
    if (arguments == args) {
        // Default viewport arguments passed in. This is a signal to reset the viewport.
        args.width = ViewportArguments::ValueDesktopWidth;
    } else
        args = arguments;

    FrameView* frameView = m_webView->mainFrameImpl()->frameView();
    int dpi = screenHorizontalDPI(frameView);
    ASSERT(dpi > 0);

    WebViewClient* client = m_webView->client();
    WebRect deviceRect = client->windowRect();
    // If the window size has not been set yet don't attempt to set the viewport
    if (!deviceRect.width || !deviceRect.height)
        return;

    Settings* settings = m_webView->page()->settings();
    float devicePixelRatio = dpi / ViewportArguments::deprecatedTargetDPI;
    // Call the common viewport computing logic in ViewportArguments.cpp.
    ViewportAttributes computed = computeViewportAttributes(
        args, settings->layoutFallbackWidth(), deviceRect.width, deviceRect.height,
        devicePixelRatio, IntSize(deviceRect.width, deviceRect.height));

    restrictScaleFactorToInitialScaleIfNotUserScalable(computed);

    if (m_webView->ignoreViewportTagMaximumScale()) {
        computed.maximumScale = max(computed.maximumScale, m_webView->maxPageScaleFactor);
        computed.userScalable = true;
    }

    int layoutWidth = computed.layoutSize.width();
    int layoutHeight = computed.layoutSize.height();
    m_webView->setFixedLayoutSize(IntSize(layoutWidth, layoutHeight));

    bool needInitializePageScale = !m_webView->isPageScaleFactorSet();
    m_webView->setDeviceScaleFactor(devicePixelRatio);
    m_webView->setPageScaleFactorLimits(computed.minimumScale, computed.maximumScale);
    if (needInitializePageScale)
        m_webView->setPageScaleFactorPreservingScrollOffset(computed.initialScale * devicePixelRatio);
#endif
}

Example #2

File: ChromeClientImpl.cpp Project: Moondee/Artemis

void ChromeClientImpl::dispatchViewportPropertiesDidChange(const ViewportArguments& arguments) const
{
#if ENABLE(VIEWPORT)
    if (!m_webView->settings()->viewportEnabled() || !m_webView->isFixedLayoutModeEnabled() || !m_webView->client() || !m_webView->page())
        return;

    bool useDefaultDeviceScaleFactor = false;
    ViewportArguments args;
    if (arguments == args) {
        // Default viewport arguments passed in. This is a signal to reset the viewport.
        args.width = ViewportArguments::ValueDesktopWidth;
        useDefaultDeviceScaleFactor = true;
    } else
        args = arguments;

    FrameView* frameView = m_webView->mainFrameImpl()->frameView();
    int dpi = screenHorizontalDPI(frameView);
    ASSERT(dpi > 0);

    WebViewClient* client = m_webView->client();
    WebRect deviceRect = client->windowRect();
    // If the window size has not been set yet don't attempt to set the viewport
    if (!deviceRect.width || !deviceRect.height)
        return;

    Settings* settings = m_webView->page()->settings();
    // Call the common viewport computing logic in ViewportArguments.cpp.
    ViewportAttributes computed = computeViewportAttributes(
        args, settings->layoutFallbackWidth(), deviceRect.width, deviceRect.height,
        dpi, IntSize(deviceRect.width, deviceRect.height));

    int layoutWidth = computed.layoutSize.width();
    int layoutHeight = computed.layoutSize.height();
    m_webView->setFixedLayoutSize(IntSize(layoutWidth, layoutHeight));

    // FIXME: Investigate the impact this has on layout/rendering if any.
    // This exposes the correct device scale to javascript and media queries.
    if (useDefaultDeviceScaleFactor && settings->defaultDeviceScaleFactor())
        m_webView->setDeviceScaleFactor(settings->defaultDeviceScaleFactor());
    else
        m_webView->setDeviceScaleFactor(computed.devicePixelRatio);
    m_webView->setPageScaleFactorLimits(computed.minimumScale, computed.maximumScale);
    m_webView->setPageScaleFactorPreservingScrollOffset(computed.initialScale * computed.devicePixelRatio);
#endif
}

Example #3

File: Screen.cpp Project: CannedFish/deepin-webkit

unsigned Screen::horizontalDPI() const
{
    if (!m_frame)
        return 0;
    return static_cast<unsigned>(screenHorizontalDPI(m_frame->view()));
}