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project/fm_viewer/fav/widget/OpenGLWidgetRenderer.cpp

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+/******************************************************************************
+    QtAV:  Multimedia framework based on Qt and FFmpeg
+    Copyright (C) 2012-2016 Wang Bin <wbsecg1@gmail.com>
+
+*   This file is part of QtAV (from 2014)
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+******************************************************************************/
+
+#include "OpenGLWidgetRenderer.h"
+#include "../OpenGLRendererBase_p.h"
+#include <QtGui/QGuiApplication>
+#include <QtGui/QResizeEvent>
+#include <QtGui/QScreen>
+
+namespace FAV {
+
+class OpenGLWidgetRendererPrivate : public OpenGLRendererBasePrivate
+{
+public:
+    OpenGLWidgetRendererPrivate(QPaintDevice *pd)
+        : OpenGLRendererBasePrivate(pd)
+    {}
+};
+
+VideoRendererId OpenGLWidgetRenderer::id() const
+{
+    return VideoRendererId_OpenGLWidget;
+}
+
+OpenGLWidgetRenderer::OpenGLWidgetRenderer(QWidget *parent, Qt::WindowFlags f):
+    QOpenGLWidget(parent, f)
+  , OpenGLRendererBase(*new OpenGLWidgetRendererPrivate(this))
+{
+    setAcceptDrops(true);
+    setFocusPolicy(Qt::StrongFocus);
+}
+
+void OpenGLWidgetRenderer::initializeGL()
+{
+    onInitializeGL();
+}
+
+void OpenGLWidgetRenderer::paintGL()
+{
+    onPaintGL();
+}
+
+void OpenGLWidgetRenderer::resizeGL(int w, int h)
+{
+    // QGLWidget uses window()->windowHandle()->devicePixelRatio() for resizeGL(), while QOpenGLWidget does not, so scale here
+#if QT_VERSION >= QT_VERSION_CHECK(5, 5, 0)
+    if (!context())
+        return;
+    const qreal dpr = context()->screen()->devicePixelRatio();
+#elif QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
+    // qApp->devicePixelRatio() is global, window()->windowHandle()->devicePixelRatio() depends on screen, check window() and windowHandle() is required.
+    // QWidget.devicePixelRatio() is int, but float value is not implemented in old qt, so just use int is fine.
+    const qreal dpr = devicePixelRatio();
+#else
+    const qreal dpr = qApp->devicePixelRatio();
+#endif
+    onResizeGL(w*dpr, h*dpr);
+}
+
+void OpenGLWidgetRenderer::resizeEvent(QResizeEvent *e)
+{
+    onResizeEvent(e->size().width(), e->size().height());
+    QOpenGLWidget::resizeEvent(e); //will call resizeGL(). TODO:will call paintEvent()?
+}
+
+void OpenGLWidgetRenderer::showEvent(QShowEvent *e)
+{
+    Q_UNUSED(e);
+    onShowEvent(); // TODO: onShowEvent(w, h)?
+    resizeGL(width(), height());
+}
+} //namespace FAV