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project/fm_viewer/fav/widget/WidgetRenderer.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
+
+    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 "WidgetRenderer.h"
+#include "../QPainterRenderer_p.h"
+#include <QtGui/QFont>
+#include <QtGui/QPainter>
+#include <QApplication>
+#include <QResizeEvent>
+#include "../Filter.h"
+
+namespace FAV {
+class WidgetRendererPrivate : public QPainterRendererPrivate
+{
+public:
+    virtual ~WidgetRendererPrivate(){}
+};
+
+VideoRendererId WidgetRenderer::id() const
+{
+    return VideoRendererId_Widget;
+}
+
+WidgetRenderer::WidgetRenderer(QWidget *parent, Qt::WindowFlags f) :
+    QWidget(parent, f),QPainterRenderer(*new WidgetRendererPrivate())
+{
+    DPTR_D(WidgetRenderer);
+    d.painter = new QPainter();
+    setAcceptDrops(true);
+    setFocusPolicy(Qt::StrongFocus);
+    /* To rapidly update custom widgets that constantly paint over their entire areas with
+     * opaque content, e.g., video streaming widgets, it is better to set the widget's
+     * Qt::WA_OpaquePaintEvent, avoiding any unnecessary overhead associated with repainting the
+     * widget's background
+     */
+    setAttribute(Qt::WA_OpaquePaintEvent);
+    setAutoFillBackground(false);
+    QPainterFilterContext *ctx = static_cast<QPainterFilterContext*>(d.filter_context);
+    if (ctx) {
+        ctx->painter = d.painter;
+    } else {
+        qWarning("FilterContext not available!");
+    }
+}
+
+WidgetRenderer::WidgetRenderer(WidgetRendererPrivate &d, QWidget *parent, Qt::WindowFlags f)
+    :QWidget(parent, f),QPainterRenderer(d)
+{
+    d.painter = new QPainter();
+    setAcceptDrops(true);
+    setFocusPolicy(Qt::StrongFocus);
+    setAutoFillBackground(false);
+    QPainterFilterContext *ctx = static_cast<QPainterFilterContext*>(d.filter_context);
+    if (ctx) {
+        ctx->painter = d.painter;
+    } else {
+        qWarning("FilterContext not available!");
+    }
+}
+
+bool WidgetRenderer::receiveFrame(const VideoFrame &frame)
+{
+    preparePixmap(frame);
+    updateUi();
+    /*
+     * workaround for the widget not updated if has parent. don't know why it works and why update() can't
+     * Thanks to Vito Covito and Carlo Scarpato
+     * Now it's fixed by posting a QUpdateLaterEvent
+     */
+    Q_EMIT imageReady();
+    return true;
+}
+
+void WidgetRenderer::resizeEvent(QResizeEvent *e)
+{
+    DPTR_D(WidgetRenderer);
+    d.update_background = true;
+    resizeRenderer(e->size());
+    update();
+}
+
+void WidgetRenderer::paintEvent(QPaintEvent *)
+{
+    DPTR_D(WidgetRenderer);
+    d.painter->begin(this); //Widget painting can only begin as a result of a paintEvent
+    handlePaintEvent();
+    if (d.painter->isActive())
+        d.painter->end();
+}
+
+bool WidgetRenderer::onSetOrientation(int value)
+{
+    Q_UNUSED(value);
+    update();
+    return true;
+}
+
+} //namespace QtAV