2 * This file is part of CameraPlus.
4 * Copyright (C) 2012-2013 Mohammed Sameer <msameer@foolab.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "qtcamgraphicsviewfinder.h"
22 #include "qtcamconfig.h"
23 #include "qtcamdevice.h"
25 #include "qtcamviewfinderrenderer.h"
27 #include <QGraphicsSceneResizeEvent>
30 class QtCamGraphicsViewfinderPrivate {
32 void ensureBackend() {
34 renderer = QtCamViewfinderRenderer::create(conf, q_ptr);
36 qCritical() << "Failed to create a viewfinder renderer";
40 renderer->resize(q_ptr->size());
41 QObject::connect(renderer, SIGNAL(updateRequested()), q_ptr, SLOT(updateRequested()));
42 QObject::connect(renderer, SIGNAL(renderAreaChanged()), q_ptr, SIGNAL(renderAreaChanged()));
43 QObject::connect(renderer, SIGNAL(videoResolutionChanged()), q_ptr, SIGNAL(videoResolutionChanged()));
53 QtCamViewfinderRenderer *renderer;
56 QtCamGraphicsViewfinder *q_ptr;
60 QtCamGraphicsViewfinder::QtCamGraphicsViewfinder(QtCamConfig *config, QGraphicsItem *parent) :
61 QGraphicsWidget(parent), d_ptr(new QtCamGraphicsViewfinderPrivate) {
66 d_ptr->enabled = true;
69 QtCamGraphicsViewfinder::~QtCamGraphicsViewfinder() {
70 delete d_ptr->renderer;
71 delete d_ptr; d_ptr = 0;
74 GstElement *QtCamGraphicsViewfinder::sinkElement() {
75 d_ptr->ensureBackend();
77 if (!d_ptr->renderer) {
81 return d_ptr->renderer->sinkElement();
84 bool QtCamGraphicsViewfinder::setDevice(QtCamDevice *device) {
85 if (device && d_ptr->dev == device) {
90 qWarning() << "QtCamGraphicsViewfinder: viewfinder cannot be replaced.";
95 qWarning() << "QtCamGraphicsViewfinder: viewfinder cannot be unset.";
99 // This is to break the loop.
101 if (!device->setViewfinder(this)) {
106 d_ptr->resetBackend();
111 void QtCamGraphicsViewfinder::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
116 painter->fillRect(boundingRect(), Qt::black);
118 if (!d_ptr->renderer || !d_ptr->enabled) {
122 bool needsNativePainting = d_ptr->renderer->needsNativePainting();
124 if (needsNativePainting) {
125 painter->beginNativePainting();
128 d_ptr->renderer->paint(QMatrix4x4(painter->combinedTransform()), painter->viewport());
130 if (needsNativePainting) {
131 painter->endNativePainting();
135 void QtCamGraphicsViewfinder::resizeEvent(QGraphicsSceneResizeEvent *event) {
136 QGraphicsWidget::resizeEvent(event);
138 if (!d_ptr->renderer) {
142 d_ptr->renderer->resize(event->newSize());
145 void QtCamGraphicsViewfinder::updateRequested() {
146 if (d_ptr->enabled) {
151 void QtCamGraphicsViewfinder::stop() {
152 d_ptr->resetBackend();
154 setRenderingEnabled(true);
157 QRectF QtCamGraphicsViewfinder::renderArea() const {
158 if (!d_ptr->renderer) {
162 return d_ptr->renderer->renderArea();
165 QSizeF QtCamGraphicsViewfinder::videoResolution() const {
166 if (!d_ptr->renderer) {
170 return d_ptr->renderer->videoResolution();
173 bool QtCamGraphicsViewfinder::isRenderingEnabled() const {
174 return d_ptr->enabled;
177 void QtCamGraphicsViewfinder::setRenderingEnabled(bool enabled) {
178 if (d_ptr->enabled != enabled) {
179 d_ptr->enabled = enabled;
181 emit renderingEnabledChanged();