VideoRenderWidget.cpp
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/**
* @file
* @brief Source file for Video RendererWidget class
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @section LICENSE
*
* Copyright (c) 2008-2014 OpenShot Studios, LLC
* <http://www.openshotstudios.com/>. This file is part of
* OpenShot Library (libopenshot), an open-source project dedicated to
* delivering high quality video editing and animation solutions to the
* world. For more information visit <http://www.openshot.org/>.
*
* OpenShot Library (libopenshot) 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 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) 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 OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../../include/Qt/VideoRenderWidget.h"
#include <QtGui/QPaintEvent>
VideoRenderWidget::VideoRenderWidget(QWidget *parent)
: QWidget(parent), renderer(new VideoRenderer(this))
{
QPalette p = palette();
p.setColor(QPalette::Window, Qt::black);
setPalette(p);
setAttribute(Qt::WA_OpaquePaintEvent);
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
// init aspect ratio settings (default values)
aspect_ratio.num = 16;
aspect_ratio.den = 9;
pixel_ratio.num = 1;
pixel_ratio.den = 1;
connect(renderer, SIGNAL(present(const QImage &)), this, SLOT(present(const QImage &)));
}
VideoRenderWidget::~VideoRenderWidget()
{
}
VideoRenderer *VideoRenderWidget::GetRenderer() const
{
return renderer;
}
void VideoRenderWidget::SetAspectRatio(openshot::Fraction new_aspect_ratio, openshot::Fraction new_pixel_ratio)
{
aspect_ratio = new_aspect_ratio;
pixel_ratio = new_pixel_ratio;
}
QRect VideoRenderWidget::centeredViewport(int width, int height)
{
// calculate aspect ratio
float aspectRatio = aspect_ratio.ToFloat() * pixel_ratio.ToFloat();
int heightFromWidth = (int) (width / aspectRatio);
int widthFromHeight = (int) (height * aspectRatio);
if (heightFromWidth <= height) {
return QRect(0,(height - heightFromWidth) / 2, width, heightFromWidth);
} else {
return QRect((width - widthFromHeight) / 2.0, 0, widthFromHeight, height);
}
}
void VideoRenderWidget::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
// maintain aspect ratio
painter.fillRect(event->rect(), palette().window());
painter.setViewport(centeredViewport(width(), height()));
painter.drawImage(QRect(0, 0, width(), height()), image);
}
void VideoRenderWidget::present(const QImage &m)
{
image = m;
repaint();
}
openshot::Fraction::ToFloat
float ToFloat()
Return this fraction as a float (i.e. 1/2 = 0.5)
Definition: Fraction.cpp:41
VideoRenderWidget::GetRenderer
VideoRenderer * GetRenderer() const
Definition: VideoRenderWidget.cpp:53
openshot::Fraction
This class represents a fraction.
Definition: Fraction.h:42
VideoRenderWidget::paintEvent
void paintEvent(QPaintEvent *event)
Definition: VideoRenderWidget.cpp:78
VideoRenderWidget::centeredViewport
QRect centeredViewport(int width, int height)
Definition: VideoRenderWidget.cpp:64
VideoRenderWidget::VideoRenderWidget
VideoRenderWidget(QWidget *parent=0)
Definition: VideoRenderWidget.cpp:31
openshot::Fraction::num
int num
Numerator for the fraction.
Definition: Fraction.h:44
openshot::Fraction::den
int den
Denominator for the fraction.
Definition: Fraction.h:45
VideoRenderer
Definition: VideoRenderer.h:39
VideoRenderWidget::SetAspectRatio
void SetAspectRatio(openshot::Fraction new_aspect_ratio, openshot::Fraction new_pixel_ratio)
Definition: VideoRenderWidget.cpp:58
VideoRenderWidget::~VideoRenderWidget
~VideoRenderWidget()
Definition: VideoRenderWidget.cpp:49