C++ QX11PixmapData::resize方法代码示例

void QX11WindowSurface::setGeometry(const QRect &rect)
{
    QWindowSurface::setGeometry(rect);

    const QSize size = rect.size();

    if (d_ptr->device.size() == size || size.width() <= 0 || size.height() <= 0)
        return;
#ifndef QT_NO_XRENDER
    if (d_ptr->translucentBackground) {
        QX11PixmapData *data = new QX11PixmapData(QPixmapData::PixmapType);
        data->xinfo = d_ptr->widget->x11Info();
        data->resize(size.width(), size.height());
        d_ptr->device = QPixmap(data);
    } else
#endif
    {
        QPixmap::x11SetDefaultScreen(d_ptr->widget->x11Info().screen());

        QX11PixmapData *oldData = static_cast<QX11PixmapData *>(d_ptr->device.pixmapData());

        if (oldData && !(oldData->flags & QX11PixmapData::Uninitialized) && hasStaticContents()) {
            // Copy the content of the old pixmap into the new one.
            QX11PixmapData *newData = new QX11PixmapData(QPixmapData::PixmapType);
            newData->resize(size.width(), size.height());
            Q_ASSERT(oldData->d == newData->d);

            QRegion staticRegion(staticContents());
            // Make sure we're inside the boundaries of the old pixmap.
            staticRegion &= QRect(0, 0, oldData->w, oldData->h);
            const QRect boundingRect(staticRegion.boundingRect());
            const int dx = boundingRect.x();
            const int dy = boundingRect.y();

            int num;
            XRectangle *rects = (XRectangle *)qt_getClipRects(staticRegion, num);
            GC tmpGc = XCreateGC(X11->display, oldData->hd, 0, 0);
            XSetClipRectangles(X11->display, tmpGc, 0, 0, rects, num, YXBanded);
            XCopyArea(X11->display, oldData->hd, newData->hd, tmpGc,
                      dx, dy, qMin(boundingRect.width(), size.width()),
                      qMin(boundingRect.height(), size.height()), dx, dy);
            XFreeGC(X11->display, tmpGc);
            newData->flags &= ~QX11PixmapData::Uninitialized;

            d_ptr->device = QPixmap(newData);
        } else {
            d_ptr->device = QPixmap(size);
        }
    }

    if (gc) {
        XFreeGC(X11->display, gc);
        gc = 0;
    }
    if (!d_ptr->device.isNull()) {
        gc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);
        XSetGraphicsExposures(X11->display, gc, False);
    }
}

QPixmap QX11GLWindowSurface::grabWidget(const QWidget *widget, const QRect& rect) const
{
    if (!widget || m_backBuffer.isNull())
        return QPixmap();

    QRect srcRect;

    // make sure the rect is inside the widget & clip to widget's rect
    if (!rect.isEmpty())
        srcRect = rect & widget->rect();
    else
        srcRect = widget->rect();

    if (srcRect.isEmpty())
        return QPixmap();

    // If it's a child widget we have to translate the coordinates
    if (widget != window())
        srcRect.translate(widget->mapTo(window(), QPoint(0, 0)));

    QPixmap::x11SetDefaultScreen(widget->x11Info().screen());

    QX11PixmapData *pmd = new QX11PixmapData(QPixmapData::PixmapType);
    pmd->resize(srcRect.width(), srcRect.height());
    QPixmap px(pmd);

    GC tmpGc = XCreateGC(X11->display, m_backBuffer.handle(), 0, 0);

    // Make sure all GL rendering is complete before copying the window
    QGLContext* ctx = static_cast<QX11GLPixmapData*>(m_backBuffer.pixmapData())->context();
    if (QGLContext::currentContext() != ctx && ctx && ctx->isValid())
        ctx->makeCurrent();
    eglWaitClient();

    // Copy srcRect from the backing store to the new pixmap
    XSetGraphicsExposures(X11->display, tmpGc, False);
    XCopyArea(X11->display, m_backBuffer.handle(), px.handle(), tmpGc,
              srcRect.x(), srcRect.y(), srcRect.width(), srcRect.height(), 0, 0);
    XFreeGC(X11->display, tmpGc);

    // Wait until the copy has finised before allowing more rendering into the back buffer
    eglWaitNative(EGL_CORE_NATIVE_ENGINE);

    return px;
}

    QX11GLSharedContexts()
        : rgbContext(0)
        , argbContext(0)
        , sharedQGLContext(0)
        , sharePixmap(0)
    {
        EGLint rgbConfigId;
        EGLint argbConfigId;

        do {
            EGLConfig rgbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL, QEgl::Renderable);
            EGLConfig argbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL,
                                                       QEgl::Renderable | QEgl::Translucent);

            eglGetConfigAttrib(QEgl::display(), rgbConfig, EGL_CONFIG_ID, &rgbConfigId);
            eglGetConfigAttrib(QEgl::display(), argbConfig, EGL_CONFIG_ID, &argbConfigId);

            rgbContext = new QEglContext;
            rgbContext->setConfig(rgbConfig);
            rgbContext->createContext();

            if (!rgbContext->isValid())
                break;

            // If the RGB & ARGB configs are the same, use the same egl context for both:
            if (rgbConfig == argbConfig)
                argbContext = rgbContext;

            // Otherwise, create a separate context to be used for ARGB pixmaps:
            if (!argbContext) {
                argbContext = new QEglContext;
                argbContext->setConfig(argbConfig);
                bool success = argbContext->createContext(rgbContext);
                if (!success) {
                    qWarning("QX11GLPixmapData - RGB & ARGB contexts aren't shared");
                    success = argbContext->createContext();
                    if (!success)
                        argbContext = rgbContext; // Might work, worth a shot at least.
                }
            }

            if (!argbContext->isValid())
                break;

            // Create the pixmap which will be used to create the egl surface for the share QGLContext
            QX11PixmapData *rgbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
            rgbPixmapData->resize(8, 8);
            rgbPixmapData->fill(Qt::red);
            sharePixmap = new QPixmap(rgbPixmapData);
            EGLSurface sharePixmapSurface = QEgl::createSurface(sharePixmap, rgbConfig);
            rgbPixmapData->gl_surface = (void*)sharePixmapSurface;

            // Create the actual QGLContext which will be used for sharing
            sharedQGLContext = new QGLContext(QX11GLPixmapData::glFormat());
            sharedQGLContext->d_func()->eglContext = rgbContext;
            sharedQGLContext->d_func()->eglSurface = sharePixmapSurface;
            sharedQGLContext->d_func()->valid = true;
            qt_glformat_from_eglconfig(sharedQGLContext->d_func()->glFormat, rgbConfig);


            valid = rgbContext->makeCurrent(sharePixmapSurface);

            // If the ARGB & RGB configs are different, check ARGB works too:
            if (argbConfig != rgbConfig) {
                QX11PixmapData *argbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
                argbPixmapData->resize(8, 8);
                argbPixmapData->fill(Qt::transparent); // Force ARGB
                QPixmap argbPixmap(argbPixmapData); // destroys pixmap data when goes out of scope
                EGLSurface argbPixmapSurface = QEgl::createSurface(&argbPixmap, argbConfig);
                valid = argbContext->makeCurrent(argbPixmapSurface);
                argbContext->doneCurrent();
                eglDestroySurface(QEgl::display(), argbPixmapSurface);
                argbPixmapData->gl_surface = 0;
            }

            if (!valid) {
                qWarning() << "Unable to make pixmap surface current:" << QEgl::errorString();
                break;
            }

            // The pixmap surface destruction hooks are installed by QGLTextureCache, so we
            // must make sure this is instanciated:
            QGLTextureCache::instance();
        } while(0);

        if (!valid)
            cleanup();
        else
            qDebug("Using QX11GLPixmapData with EGL config %d for ARGB and config %d for RGB", argbConfigId, rgbConfigId);

    }

bool QX11GLPixmapData::hasX11GLPixmaps()
{
    static bool checkedForX11Pixmaps = false;
    static bool haveX11Pixmaps = false;

    if (checkedForX11Pixmaps)
        return haveX11Pixmaps;

    checkedForX11Pixmaps = true;

    QX11PixmapData *argbPixmapData = 0;
    QX11PixmapData *rgbPixmapData = 0;
    do {
        if (qgetenv("QT_USE_X11GL_PIXMAPS").isEmpty())
            break;

        // Check we actually have EGL configs which support pixmaps
        EGLConfig argbConfig = qt_chooseEGLConfigForPixmap(true, false);
        EGLConfig rgbConfig = qt_chooseEGLConfigForPixmap(false, false);

        if (argbConfig == 0 || rgbConfig == 0)
            break;

        // Create the shared contexts:
        eglBindAPI(EGL_OPENGL_ES_API);
        EGLint contextAttribs[] = {
#if defined(QT_OPENGL_ES_2)
            EGL_CONTEXT_CLIENT_VERSION, 2,
#endif
            EGL_NONE
        };
        qPixmapARGBSharedEglContext = eglCreateContext(QEglContext::defaultDisplay(0),
                                                       argbConfig, 0, contextAttribs);

        if (argbConfig == rgbConfig) {
            // If the configs are the same, we can re-use the same context.
            qPixmapRGBSharedEglContext = qPixmapARGBSharedEglContext;
        } else {
            qPixmapRGBSharedEglContext = eglCreateContext(QEglContext::defaultDisplay(0),
                                                           rgbConfig, 0, contextAttribs);
        }

        argbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
        argbPixmapData->resize(100, 100);
        argbPixmapData->fill(Qt::transparent); // Force ARGB

        if (!qt_createEGLSurfaceForPixmap(argbPixmapData, false))
            break;

        haveX11Pixmaps = eglMakeCurrent(QEglContext::defaultDisplay(0),
                                        (EGLSurface)argbPixmapData->gl_surface,
                                        (EGLSurface)argbPixmapData->gl_surface,
                                        qPixmapARGBSharedEglContext);
        if (!haveX11Pixmaps) {
            EGLint err = eglGetError();
            qWarning() << "Unable to make pixmap config current:" << err << QEglContext::errorString(err);
            break;
        }

        // If the ARGB & RGB configs are the same, we don't need to check RGB too
        if (haveX11Pixmaps && (argbConfig != rgbConfig)) {
            rgbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
            rgbPixmapData->resize(100, 100);
            rgbPixmapData->fill(Qt::red);

            // Try to actually create an EGL pixmap surface
            if (!qt_createEGLSurfaceForPixmap(rgbPixmapData, false))
                break;

            haveX11Pixmaps = eglMakeCurrent(QEglContext::defaultDisplay(0),
                                            (EGLSurface)rgbPixmapData->gl_surface,
                                            (EGLSurface)rgbPixmapData->gl_surface,
                                            qPixmapRGBSharedEglContext);
            if (!haveX11Pixmaps) {
                EGLint err = eglGetError();
                qWarning() << "Unable to make pixmap config current:" << err << QEglContext::errorString(err);
                break;
            }
        }
    } while (0);

    if (qPixmapARGBSharedEglContext || qPixmapRGBSharedEglContext) {
        eglMakeCurrent(QEglContext::defaultDisplay(0),
                       EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
    }

    if (argbPixmapData) {
        if (argbPixmapData->gl_surface)
            QGLContextPrivate::destroyGlSurfaceForPixmap(argbPixmapData);
        delete argbPixmapData;
        argbPixmapData = 0;
    }
    if (rgbPixmapData) {
        if (rgbPixmapData->gl_surface)
            QGLContextPrivate::destroyGlSurfaceForPixmap(rgbPixmapData);
        delete rgbPixmapData;
        rgbPixmapData = 0;
    }

    if (!haveX11Pixmaps) {
//.........这里部分代码省略.........