bool RenderObjectManager::render() {
// Den Objekt-Status des Wurzelobjektes aktualisieren. Dadurch werden rekursiv alle Baumelemente aktualisiert.
// Beim aktualisieren des Objekt-Status werden auch die Update-Rects gefunden, so dass feststeht, was neu gezeichnet
// werden muss.
if (!_rootPtr.isValid() || !_rootPtr->updateObjectState())
return false;
_frameStarted = false;
// Die Render-Methode der Wurzel aufrufen. Dadurch wird das rekursive Rendern der Baumelemente angestoßen.
_currQueue->clear();
_rootPtr->preRender(_currQueue);
_uta->clear();
// Add rectangles of objects which don't exist in this frame any more
for (RenderObjectQueue::iterator it = _prevQueue->begin(); it != _prevQueue->end(); ++it) {
if (!_currQueue->exists(*it))
_uta->addRect((*it)._bbox);
}
// Add rectangles of objects which are different from the previous frame
for (RenderObjectQueue::iterator it = _currQueue->begin(); it != _currQueue->end(); ++it) {
if (!_prevQueue->exists(*it))
_uta->addRect((*it)._bbox);
}
RectangleList *updateRects = _uta->getRectangles();
Common::Array<int> updateRectsMinZ;
updateRectsMinZ.reserve(updateRects->size());
// Calculate the minimum drawing Z value of each update rectangle
// Solid bitmaps with a Z order less than the value calculated here would be overdrawn again and
// so don't need to be drawn in the first place which speeds things up a bit.
for (RectangleList::iterator rectIt = updateRects->begin(); rectIt != updateRects->end(); ++rectIt) {
int minZ = 0;
for (RenderObjectQueue::iterator it = _currQueue->reverse_begin(); it != _currQueue->end(); --it) {
if ((*it)._renderObject->isVisible() && (*it)._renderObject->isSolid() &&
(*it)._renderObject->getBbox().contains(*rectIt)) {
minZ = (*it)._renderObject->getAbsoluteZ();
break;
}
}
updateRectsMinZ.push_back(minZ);
}
if (_rootPtr->render(updateRects, updateRectsMinZ)) {
// Copy updated rectangles to the video screen
Graphics::Surface *backSurface = Kernel::getInstance()->getGfx()->getSurface();
for (RectangleList::iterator rectIt = updateRects->begin(); rectIt != updateRects->end(); ++rectIt) {
const int x = (*rectIt).left;
const int y = (*rectIt).top;
const int width = (*rectIt).width();
const int height = (*rectIt).height();
g_system->copyRectToScreen(backSurface->getBasePtr(x, y), backSurface->pitch, x, y, width, height);
}
}
delete updateRects;
SWAP(_currQueue, _prevQueue);
return true;
}
