webview.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

}

void WebView::setCacheModel(WebCacheModel cacheModel)
{
    if (s_didSetCacheModel && cacheModel == s_cacheModel)
        return;

    RetainPtr<CFURLCacheRef> cfurlCache(AdoptCF, CFURLCacheCopySharedURLCache());
    RetainPtr<CFStringRef> cfurlCacheDirectory(AdoptCF, wkCopyFoundationCacheDirectory());
    if (!cfurlCacheDirectory)
        cfurlCacheDirectory.adoptCF(WebCore::localUserSpecificStorageDirectory().createCFString());

    // As a fudge factor, use 1000 instead of 1024, in case the reported byte 
    // count doesn't align exactly to a megabyte boundary.
    unsigned long long memSize = WebMemorySize() / 1024 / 1000;
    unsigned long long diskFreeSize = WebVolumeFreeSize(cfurlCacheDirectory.get()) / 1024 / 1000;

    unsigned cacheTotalCapacity = 0;
    unsigned cacheMinDeadCapacity = 0;
    unsigned cacheMaxDeadCapacity = 0;
    double deadDecodedDataDeletionInterval = 0;

    unsigned pageCacheCapacity = 0;

    CFIndex cfurlCacheMemoryCapacity = 0;
    CFIndex cfurlCacheDiskCapacity = 0;

    switch (cacheModel) {
    case WebCacheModelDocumentViewer: {
        // Page cache capacity (in pages)
        pageCacheCapacity = 0;

        // Object cache capacities (in bytes)
        if (memSize >= 2048)
            cacheTotalCapacity = 96 * 1024 * 1024;
        else if (memSize >= 1536)
            cacheTotalCapacity = 64 * 1024 * 1024;
        else if (memSize >= 1024)
            cacheTotalCapacity = 32 * 1024 * 1024;
        else if (memSize >= 512)
            cacheTotalCapacity = 16 * 1024 * 1024; 

        cacheMinDeadCapacity = 0;
        cacheMaxDeadCapacity = 0;

        // Foundation memory cache capacity (in bytes)
        cfurlCacheMemoryCapacity = 0;

        // Foundation disk cache capacity (in bytes)
        cfurlCacheDiskCapacity = CFURLCacheDiskCapacity(cfurlCache.get());

        break;
    }
    case WebCacheModelDocumentBrowser: {
        // Page cache capacity (in pages)
        if (memSize >= 1024)
            pageCacheCapacity = 3;
        else if (memSize >= 512)
            pageCacheCapacity = 2;
        else if (memSize >= 256)
            pageCacheCapacity = 1;
        else
            pageCacheCapacity = 0;

        // Object cache capacities (in bytes)
        if (memSize >= 2048)
            cacheTotalCapacity = 96 * 1024 * 1024;
        else if (memSize >= 1536)
            cacheTotalCapacity = 64 * 1024 * 1024;
        else if (memSize >= 1024)
            cacheTotalCapacity = 32 * 1024 * 1024;
        else if (memSize >= 512)
            cacheTotalCapacity = 16 * 1024 * 1024; 

        cacheMinDeadCapacity = cacheTotalCapacity / 8;
        cacheMaxDeadCapacity = cacheTotalCapacity / 4;

        // Foundation memory cache capacity (in bytes)
        if (memSize >= 2048)
            cfurlCacheMemoryCapacity = 4 * 1024 * 1024;
        else if (memSize >= 1024)
            cfurlCacheMemoryCapacity = 2 * 1024 * 1024;
        else if (memSize >= 512)
            cfurlCacheMemoryCapacity = 1 * 1024 * 1024;
        else
            cfurlCacheMemoryCapacity =      512 * 1024; 

        // Foundation disk cache capacity (in bytes)
        if (diskFreeSize >= 16384)
            cfurlCacheDiskCapacity = 50 * 1024 * 1024;
        else if (diskFreeSize >= 8192)
            cfurlCacheDiskCapacity = 40 * 1024 * 1024;
        else if (diskFreeSize >= 4096)
            cfurlCacheDiskCapacity = 30 * 1024 * 1024;
        else
            cfurlCacheDiskCapacity = 20 * 1024 * 1024;

        break;
    }
    case WebCacheModelPrimaryWebBrowser: {
        // Page cache capacity (in pages)
        // (Research indicates that value / page drops substantially after 3 pages.)
        if (memSize >= 2048)
            pageCacheCapacity = 5;
        else if (memSize >= 1024)
            pageCacheCapacity = 4;
        else if (memSize >= 512)
            pageCacheCapacity = 3;
        else if (memSize >= 256)
            pageCacheCapacity = 2;
        else
            pageCacheCapacity = 1;

        // Object cache capacities (in bytes)
        // (Testing indicates that value / MB depends heavily on content and
        // browsing pattern. Even growth above 128MB can have substantial 
        // value / MB for some content / browsing patterns.)
        if (memSize >= 2048)
            cacheTotalCapacity = 128 * 1024 * 1024;
        else if (memSize >= 1536)
            cacheTotalCapacity = 96 * 1024 * 1024;
        else if (memSize >= 1024)
            cacheTotalCapacity = 64 * 1024 * 1024;
        else if (memSize >= 512)
            cacheTotalCapacity = 32 * 1024 * 1024; 

        cacheMinDeadCapacity = cacheTotalCapacity / 4;
        cacheMaxDeadCapacity = cacheTotalCapacity / 2;

        // This code is here to avoid a PLT regression. We can remove it if we
        // can prove that the overall system gain would justify the regression.
        cacheMaxDeadCapacity = max(24u, cacheMaxDeadCapacity);

        deadDecodedDataDeletionInterval = 60;

        // Foundation memory cache capacity (in bytes)
        // (These values are small because WebCore does most caching itself.)
        if (memSize >= 1024)
            cfurlCacheMemoryCapacity = 4 * 1024 * 1024;
        else if (memSize >= 512)
            cfurlCacheMemoryCapacity = 2 * 1024 * 1024;
        else if (memSize >= 256)
            cfurlCacheMemoryCapacity = 1 * 1024 * 1024;
        else
            cfurlCacheMemoryCapacity =      512 * 1024; 

        // Foundation disk cache capacity (in bytes)
        if (diskFreeSize >= 16384)
            cfurlCacheDiskCapacity = 175 * 1024 * 1024;
        else if (diskFreeSize >= 8192)
            cfurlCacheDiskCapacity = 150 * 1024 * 1024;
        else if (diskFreeSize >= 4096)
            cfurlCacheDiskCapacity = 125 * 1024 * 1024;
        else if (diskFreeSize >= 2048)
            cfurlCacheDiskCapacity = 100 * 1024 * 1024;
        else if (diskFreeSize >= 1024)
            cfurlCacheDiskCapacity = 75 * 1024 * 1024;
        else
            cfurlCacheDiskCapacity = 50 * 1024 * 1024;

        break;
    }
    default:
        ASSERT_NOT_REACHED();
    }

    // Don't shrink a big disk cache, since that would cause churn.
    cfurlCacheDiskCapacity = max(cfurlCacheDiskCapacity, CFURLCacheDiskCapacity(cfurlCache.get()));

    cache()->setCapacities(cacheMinDeadCapacity, cacheMaxDeadCapacity, cacheTotalCapacity);
    cache()->setDeadDecodedDataDeletionInterval(deadDecodedDataDeletionInterval);
    pageCache()->setCapacity(pageCacheCapacity);

    CFURLCacheSetMemoryCapacity(cfurlCache.get(), cfurlCacheMemoryCapacity);
    CFURLCacheSetDiskCapacity(cfurlCache.get(), cfurlCacheDiskCapacity);

    s_didSetCacheModel = true;
    s_cacheModel = cacheModel;
    return;
}

WebCacheModel WebView::cacheModel()
{
    return s_cacheModel;
}

bool WebView::didSetCacheModel()
{
    return s_didSetCacheModel;
}

WebCacheModel WebView::maxCacheModelInAnyInstance()
{
    WebCacheModel cacheModel = WebCacheModelDocumentViewer;

    HashSet<WebView*>::iterator end = allWebViewsSet().end();
    for (HashSet<WebView*>::iterator it = allWebViewsSet().begin(); it != end; ++it) {
        COMPtr<IWebPreferences> pref;
        if (FAILED((*it)->preferences(&pref)))
            continue;
        WebCacheModel prefCacheModel = WebCacheModelDocumentViewer;
        if (FAILED(pref->cacheModel(&prefCacheModel)))
            continue;

        cacheModel = max(cacheModel, prefCacheModel);
    }

    return cacheModel;
}

void WebView::close()
{
    if (m_didClose)
        return;

    m_didClose = true;

    removeFromAllWebViewsSet();

    Frame* frame = m_page->mainFrame();
    if (frame)
        frame->loader()->detachFromParent();

    if (m_mouseOutTracker) {
        m_mouseOutTracker->dwFlags = TME_CANCEL;
        ::TrackMouseEvent(m_mouseOutTracker.get());
        m_mouseOutTracker.set(0);
    }
    
    setHostWindow(0);

    setDownloadDelegate(0);
    setEditingDelegate(0);
    setFrameLoadDelegate(0);
    setFrameLoadDelegatePrivate(0);
    setPolicyDelegate(0);
    setResourceLoadDelegate(0);
    setUIDelegate(0);
    setFormDelegate(0);

    if (m_webInspector)
        m_webInspector->webViewClosed();

    delete m_page;
    m_page = 0;

    registerForIconNotification(false);
    IWebNotificationCenter* notifyCenter = WebNotificationCenter::defaultCenterInternal();
    notifyCenter->removeObserver(this, WebPreferences::webPreferencesChangedNotification(), static_cast<IWebPreferences*>(m_preferences.get()));

    BSTR identifier = 0;
    m_preferences->identifier(&identifier);

    COMPtr<WebPreferences> preferences = m_preferences;
    m_preferences = 0;
    preferences->didRemoveFromWebView();
    // Make sure we release the reference, since WebPreferences::removeReferenceForIdentifier will check for last reference to WebPreferences
    preferences = 0;
    if (identifier) {
        WebPreferences::removeReferenceForIdentifier(identifier);
        SysFreeString(identifier);
    }

    deleteBackingStore();
}

void WebView::repaint(const WebCore::IntRect& windowRect, bool contentChanged, bool immediate, bool repaintContentOnly)
{
    if (!repaintContentOnly) {
        RECT rect = windowRect;
        ::InvalidateRect(m_viewWindow, &rect, false);
    }
    if (contentChanged)
        addToDirtyRegion(windowRect);
    if (immediate) {
        if (repaintContentOnly)
            updateBackingStore(core(topLevelFrame())->view());
        else
            ::UpdateWindow(m_viewWindow);
    }
}

void WebView::deleteBackingStore()
{
    pendingDeleteBackingStoreSet.remove(this);

    if (m_deleteBackingStoreTimerActive) {
        KillTimer(m_viewWindow, DeleteBackingStoreTimer);
        m_deleteBackingStoreTimerActive = false;
    }
    m_backingStoreBitmap.clear();
    m_backingStoreDirtyRegion.clear();

    m_backingStoreSize.cx = m_backingStoreSize.cy = 0;
}

bool WebView::ensureBackingStore()
{
    RECT windowRect;
    ::GetClientRect(m_viewWindow, &windowRect);
    LONG width = windowRect.right - windowRect.left;
    LONG height = windowRect.bottom - windowRect.top;
    if (width > 0 && height > 0 && (width != m_backingStoreSize.cx || height != m_backingStoreSize.cy)) {
        deleteBackingStore();

        m_backingStoreSize.cx = width;
        m_backingStoreSize.cy = height;
        BITMAPINFO bitmapInfo;
        bitmapInfo.bmiHeader.biSize          = sizeof(BITMAPINFOHEADER);
        bitmapInfo.bmiHeader.biWidth         = width; 
        bitmapInfo.bmiHeader.biHeight        = -height;
        bitmapInfo.bmiHeader.biPlanes        = 1;
        bitmapInfo.bmiHeader.biBitCount      = 32;
        bitmapInfo.bmiHeader.biCompression   = BI_RGB;
        bitmapInfo.bmiHeader.biSizeImage     = 0;
        bitmapInfo.bmiHeader.biXPelsPerMeter = 0;
        bitmapInfo.bmiHeader.biYPelsPerMeter = 0;
        bitmapInfo.bmiHeader.biClrUsed       = 0;
        bitmapInfo.bmiHeader.biClrImportant  = 0;

        void* pixels = NULL;
        m_backingStoreBitmap.set(::CreateDIBSection(NULL, &bitmapInfo, DIB_RGB_COLORS, &pixels, NULL, 0));
        return true;
    }

    return false;
}

void WebView::addToDirtyRegion(const IntRect& dirtyRect)
{
    HRGN newRegion = ::CreateRectRgn(dirtyRect.x(), dirtyRect.y(),
                                     dirtyRect.right(), dirtyRect.bottom());
    addToDirtyRegion(newRegion);
}

void WebView::addToDirtyRegion(HRGN newRegion)
{
    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    if (m_backingStoreDirtyRegion) {
        HRGN combinedRegion = ::CreateRectRgn(0,0,0,0);
        ::CombineRgn(combinedRegion, m_backingStoreDirtyRegion.get(), newRegion, RGN_OR);
        ::DeleteObject(newRegion);
        m_backingStoreDirtyRegion.set(combinedRegion);
    } else
        m_backingStoreDirtyRegion.set(newRegion);
}

void WebView::scrollBackingStore(FrameView* frameView, int dx, int dy, const IntRect& scrollViewRect, const IntRect& clipRect)
{
    LOCAL_GDI_COUNTER(0, __FUNCTION__);

    // If there's no backing store we don't need to update it
    if (!m_backingStoreBitmap) {
        if (m_uiDelegatePrivate)
            m_uiDelegatePrivate->webViewScrolled(this);

        return;
    }

    // Make a region to hold the invalidated scroll area.
    HRGN updateRegion = ::CreateRectRgn(0, 0, 0, 0);

    // Collect our device context info and select the bitmap to scroll.