source: trunk/src/opengl/qegl_x11egl.cpp@ 259

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#include <QtGui/qpaintdevice.h>
#include <QtGui/qpixmap.h>
#include <QtGui/qwidget.h>
#include "qegl_p.h"

#if defined(QT_OPENGL_ES) || defined(QT_OPENVG)

#if defined(Q_WS_X11)
#include <QtGui/qx11info_x11.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#endif

QT_BEGIN_NAMESPACE

bool QEglContext::createSurface(QPaintDevice *device)
{
    // Create the native drawable for the paint device.
    int devType = device->devType();
    EGLNativePixmapType pixmapDrawable = 0;
    EGLNativeWindowType windowDrawable = 0;
    bool ok;
    if (devType == QInternal::Pixmap) {
        pixmapDrawable = (EGLNativePixmapType)(static_cast<QPixmap *>(device))->handle();
        ok = (pixmapDrawable != 0);
    } else if (devType == QInternal::Widget) {
        windowDrawable = (EGLNativeWindowType)(static_cast<QWidget *>(device))->winId();
        ok = (windowDrawable != 0);
    } else {
        ok = false;
    }
    if (!ok) {
        qWarning("QEglContext::createSurface(): Cannot create the native EGL drawable");
        return false;
    }

    // Create the EGL surface to draw into, based on the native drawable.
    if (devType == QInternal::Widget)
        surf = eglCreateWindowSurface(dpy, cfg, windowDrawable, 0);
    else
        surf = eglCreatePixmapSurface(dpy, cfg, pixmapDrawable, 0);
    if (surf == EGL_NO_SURFACE) {
        qWarning("QEglContext::createSurface(): Unable to create EGL surface, error = 0x%x", eglGetError());
        return false;
    }
    return true;
}

EGLDisplay QEglContext::getDisplay(QPaintDevice *device)
{
    Q_UNUSED(device);
    Display *xdpy = QX11Info::display();
    if (!xdpy) {
        qWarning("QEglContext::getDisplay(): X11 display is not open");
        return EGL_NO_DISPLAY;
    }
    return eglGetDisplay(EGLNativeDisplayType(xdpy));
}

static int countBits(unsigned long mask)
{
    int count = 0;
    while (mask != 0) {
        if (mask & 1)
            ++count;
        mask >>= 1;
    }
    return count;
}

// Set the pixel format parameters from the visual in "xinfo".
void QEglProperties::setVisualFormat(const QX11Info *xinfo)
{
    if (!xinfo)
        return;
    Visual *visual = (Visual*)xinfo->visual();
    if (!visual)
        return;
    if (visual->c_class != TrueColor && visual->c_class != DirectColor)
        return;
    setValue(EGL_RED_SIZE, countBits(visual->red_mask));
    setValue(EGL_GREEN_SIZE, countBits(visual->green_mask));
    setValue(EGL_BLUE_SIZE, countBits(visual->blue_mask));
    setValue(EGL_ALPHA_SIZE, 0);    // XXX
}

QT_END_NAMESPACE

#endif // QT_OPENGL_ES || QT_OPENVG