QNativeImage::QNativeImage(int width, int height, QImage::Format format,bool /* isTextBuffer */, QWidget *widget)
: xshmimg(0), xshmpm(0)
{
if (!X11->use_mitshm) {
image = QImage(width, height, format);
// follow good coding practice and set xshminfo attributes, though values not used in this case
xshminfo.readOnly = true;
xshminfo.shmaddr = 0;
xshminfo.shmid = 0;
xshminfo.shmseg = 0;
return;
}
QX11Info info = widget->x11Info();
int dd = info.depth();
Visual *vis = (Visual*) info.visual();
xshmimg = XShmCreateImage(X11->display, vis, dd, ZPixmap, 0, &xshminfo, width, height);
if (!xshmimg) {
qWarning("QNativeImage: Unable to create shared XImage.");
return;
}
bool ok;
xshminfo.shmid = shmget(IPC_PRIVATE, xshmimg->bytes_per_line * xshmimg->height,
IPC_CREAT | 0777);
ok = xshminfo.shmid != -1;
if (ok) {
xshmimg->data = (char*)shmat(xshminfo.shmid, 0, 0);
xshminfo.shmaddr = xshmimg->data;
ok = (xshminfo.shmaddr != (char*)-1);
if (ok)
image = QImage((uchar *)xshmimg->data, width, height, systemFormat());
}
xshminfo.readOnly = false;
if (ok)
ok = XShmAttach(X11->display, &xshminfo);
if (!ok) {
qWarning() << "QNativeImage: Unable to attach to shared memory segment.";
if (xshmimg->data) {
free(xshmimg->data);
xshmimg->data = 0;
}
XDestroyImage(xshmimg);
xshmimg = 0;
if (xshminfo.shmaddr)
shmdt(xshminfo.shmaddr);
if (xshminfo.shmid != -1)
shmctl(xshminfo.shmid, IPC_RMID, 0);
return;
}
xshmpm = XShmCreatePixmap(X11->display, DefaultRootWindow(X11->display), xshmimg->data,
&xshminfo, width, height, dd);
if (!xshmpm) {
qWarning() << "QNativeImage: Unable to create shared Pixmap.";
}
}
Ogre::NameValuePairList OgreWidget::getWinParams()
{
Ogre::NameValuePairList params;
#if defined(Q_OS_MAC) || defined(Q_OS_WIN)
params["externalWindowHandle"] = Ogre::StringConverter::toString((size_t)(this->winId()));
#else
#if QT_VERSION < 0x050000
const QX11Info info = this->x11Info();
Ogre::String winHandle;
winHandle = Ogre::StringConverter::toString((unsigned long)(info.display()));
winHandle += ":";
winHandle += Ogre::StringConverter::toString((unsigned int)(info.screen()));
winHandle += ":";
winHandle += Ogre::StringConverter::toString((unsigned long)(this->winId()));
winHandle += ":";
winHandle += Ogre::StringConverter::toString((unsigned long)(info.visual()));
params["externalWindowHandle"] = winHandle;
#elif QT_VERSION >= 0x050100 && defined(Q_WS_X11)
const QX11Info info = this->x11Info();
Ogre::String winHandle;
winHandle = Ogre::StringConverter::toString((unsigned long)(info.display()));
winHandle += ":";
winHandle += Ogre::StringConverter::toString((unsigned int)(info.appScreen()));
winHandle += ":";
winHandle += Ogre::StringConverter::toString((unsigned long)(this->winId()));
params["externalWindowHandle"] = winHandle;
#else // only for the time between Qt 5.0 and Qt 5.1 when QX11Info was not included
params["externalWindowHandle"] = Ogre::StringConverter::toString((unsigned long)(this->winId()));
#endif
#endif
#if defined(Q_OS_MAC)
params["macAPI"] = "cocoa";
params["macAPICocoaUseNSView"] = "true";
#endif
return params;
}
void CarioQImageMainWindow::on_create_image_by_xlib_button_clicked()
{
int height = ui->label->height();
int width = ui->label->width();
QPixmap *pixmap = new QPixmap(width, height);
QPainter painter(pixmap);
QPaintDevice *pd = painter.device();
if(pd->devType() == QInternal::Pixmap)
{
QPixmap *pixmap_inner = (QPixmap*) pd;
Drawable d = (Drawable) pixmap_inner->handle();
QX11Info xinfo = pixmap_inner->x11Info();
int width = pixmap_inner->width();
int height = pixmap_inner->height();
cairo_surface_t * pCairoSurface =
cairo_xlib_surface_create_with_xrender_format
(xinfo.display(),
d,
ScreenOfDisplay(xinfo.display(), xinfo.screen()),
XRenderFindVisualFormat (xinfo.display(), (Visual*) xinfo.visual()),
width,
height);
cairo_t* pCairoContext = cairo_create(pCairoSurface);
cairo_surface_destroy(pCairoSurface);
if(pCairoContext)
{
cairo_set_source_rgb (pCairoContext, 0.627, 0, 0);
cairo_set_font_size (pCairoContext, 24.0);
cairo_move_to (pCairoContext, 10.0, 34.0);
cairo_show_text (pCairoContext, "Hello, world\nUsing Image X11 Surface");
cairo_destroy(pCairoContext);
}
}
ui->label->setPixmap(*pixmap);
}
