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VideoRenderWidget.cpp
Go to the documentation of this file.
// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include "VideoRenderWidget.h"
#include <QWidget>
#include <QImage>
#include <QPainter>
#include <QPaintEvent>
#include <QSizePolicy>
#include <QPalette>
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();
}
VideoRenderWidget.h
Header file for Video RendererWidget class.
VideoRenderWidget::centeredViewport
QRect centeredViewport(int width, int height)
Definition VideoRenderWidget.cpp:55
VideoRenderWidget::GetRenderer
VideoRenderer * GetRenderer() const
Definition VideoRenderWidget.cpp:44
VideoRenderWidget::~VideoRenderWidget
~VideoRenderWidget()
Definition VideoRenderWidget.cpp:40
VideoRenderWidget::paintEvent
void paintEvent(QPaintEvent *event)
Definition VideoRenderWidget.cpp:69
VideoRenderWidget::SetAspectRatio
void SetAspectRatio(openshot::Fraction new_aspect_ratio, openshot::Fraction new_pixel_ratio)
Definition VideoRenderWidget.cpp:49
VideoRenderWidget::VideoRenderWidget
VideoRenderWidget(QWidget *parent=0)
Definition VideoRenderWidget.cpp:22
VideoRenderer
Definition VideoRenderer.h:25
openshot::Fraction
This class represents a fraction.
Definition Fraction.h:30
openshot::Fraction::num
int num
Numerator for the fraction.
Definition Fraction.h:32
openshot::Fraction::ToFloat
float ToFloat()
Return this fraction as a float (i.e. 1/2 = 0.5)
Definition Fraction.cpp:35
openshot::Fraction::den
int den
Denominator for the fraction.
Definition Fraction.h:33