- case Qt::UniteClip: {
- d->resetClipIfNeeded();
- ++d->maxClip;
- if (state()->rectangleClip.isValid()) {
- QPainterPath path;
- path.addRect(state()->rectangleClip);
-
- // flush the existing clip rectangle to the depth buffer
- d->writeClip(qtVectorPathForPath(state()->matrix.inverted().map(path)), d->maxClip);
- }
-
- state()->clipTestEnabled = false;
-#ifndef QT_GL_NO_SCISSOR_TEST
- QRect oldRectangleClip = state()->rectangleClip;
-
- state()->rectangleClip = state()->rectangleClip.united(pathRect);
- d->updateClipScissorTest();
-
- QRegion extendRegion = QRegion(state()->rectangleClip) - oldRectangleClip;
-
- if (!extendRegion.isEmpty()) {
- QPainterPath extendPath;
- extendPath.addRegion(extendRegion);
-
- // first clear the depth buffer in the extended region
- d->writeClip(qtVectorPathForPath(state()->matrix.inverted().map(extendPath)), 0);
- }
-#endif
- // now write the clip path
- d->writeClip(path, d->maxClip);
- state()->canRestoreClip = false;
- state()->currentClip = d->maxClip;
- state()->clipTestEnabled = true;
- break;
- }