qt5/style/argbhelper.cpp

0001 /*****************************************************************************
0002  *   Copyright 2013 - 2015 Yichao Yu <yyc1992@gmail.com>                     *
0003  *                                                                           *
0004  *   This program is free software; you can redistribute it and/or modify    *
0005  *   it under the terms of the GNU Lesser General Public License as          *
0006  *   published by the Free Software Foundation; either version 2.1 of the    *
0007  *   License, or (at your option) version 3, or any later version accepted   *
0008  *   by the membership of KDE e.V. (or its successor approved by the         *
0009  *   membership of KDE e.V.), which shall act as a proxy defined in          *
0010  *   Section 6 of version 3 of the license.                                  *
0011  *                                                                           *
0012  *   This program is distributed in the hope that it will be useful,         *
0013  *   but WITHOUT ANY WARRANTY; without even the implied warranty of          *
0014  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
0015  *   Lesser General Public License for more details.                         *
0016  *                                                                           *
0017  *   You should have received a copy of the GNU Lesser General Public        *
0018  *   License along with this library. If not,                                *
0019  *   see <http://www.gnu.org/licenses/>.                                     *
0020  *****************************************************************************/
0021
0022 #include "argbhelper.h"
0023 #include <qtcurve-utils/qtutils.h>
0024
0025 #include <QWindow>
0026 #include "private/qwidget_p.h"
0027
0028 namespace QtCurve {
0029 __attribute__((hot)) void
0030 addAlphaChannel(QWidget *widget)
0031 {
0032     QTC_RET_IF_FAIL(!qtcGetWid(widget));
0033     // Set this for better efficiency for now
0034     widget->setAutoFillBackground(false);
0035     QWindow *window = widget->windowHandle();
0036     QWidgetPrivate *widgetPrivate =
0037         static_cast<QWidgetPrivate*>(QObjectPrivate::get(widget));
0038     widgetPrivate->updateIsOpaque();
0039     if (!window) {
0040         widgetPrivate->createTLExtra();
0041         widgetPrivate->createTLSysExtra();
0042         window = widget->windowHandle();
0043     }
0044     if (window) {
0045         // Maybe we can register event filters and/or listen for signals
0046         // like parent change or screen change on the QWidgetWindow
0047         // so that we have a better change to update the alpha info
0048         QSurfaceFormat format = window->format();
0049         format.setAlphaBufferSize(8);
0050         window->setFormat(format);
0051     }
0052 }
0053
0054 }