Qt 5.9 | Qt Multimedia | QML Video Shader Effects Example | Content.qml Example File

Qt 5.9.4 Reference Documentation

# Content.qml Example File

multimedia/video/qmlvideofx/qml/qmlvideofx/Content.qml

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Mobility Components.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, you may use this file under the terms of the BSD license
      ** as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      import QtQuick 2.1

      Rectangle {
          id: root
          property alias effect: effectLoader.item
          property alias gripSize: divider.gripSize
          property string effectSource
          property real volume: 0.5

          signal videoFramePainted

          Divider {
              id: divider
              visible: false
              z: 1.0
              onValueChanged: updateDivider()
          }

          ShaderEffectSource {
              id: theSource
              smooth: true
              hideSource: true
          }

          Loader {
              id: contentLoader
          }

          Loader {
              id: effectLoader
              source: effectSource
          }

          Connections {
              id: videoFramePaintedConnection
              onFramePainted: {
                  if (performanceLoader.item)
                     root.videoFramePainted()
              }
              ignoreUnknownSignals: true
          }

          onWidthChanged: {
              if (effectLoader.item)
                  effectLoader.item.targetWidth = root.width
          }

          onHeightChanged: {
              if (effectLoader.item)
                  effectLoader.item.targetHeight = root.height
          }

          onEffectSourceChanged: {
              effectLoader.source = effectSource
              effectLoader.item.parent = root
              effectLoader.item.targetWidth = root.width
              effectLoader.item.targetHeight = root.height
              updateSource()
              effectLoader.item.source = theSource
              divider.visible = effectLoader.item.divider
              updateDivider()
          }

          function init() {
              openImage("qrc:/images/qt-logo.png")
              root.effectSource = "EffectPassThrough.qml"
          }

          function updateDivider() {
              if (effectLoader.item && effectLoader.item.divider)
                  effectLoader.item.dividerValue = divider.value
          }

          function updateSource() {
              if (contentLoader.item) {
                  contentLoader.item.parent = root
                  contentLoader.item.anchors.fill = root
                  theSource.sourceItem = contentLoader.item
                  if (effectLoader.item)
                      effectLoader.item.anchors.fill = contentLoader.item
              }
          }

          function openImage(path) {
              stop()
              contentLoader.source = "ContentImage.qml"
              videoFramePaintedConnection.target = null
              contentLoader.item.source = path
              updateSource()
          }

          function openVideo(path) {
              stop()
              contentLoader.source = "ContentVideo.qml"
              videoFramePaintedConnection.target = contentLoader.item
              contentLoader.item.mediaSource = path
              contentLoader.item.volume = volume
              contentLoader.item.play()
              updateSource()
          }

          function openCamera() {
              stop()
              contentLoader.source = "ContentCamera.qml"
              videoFramePaintedConnection.target = contentLoader.item
              updateSource()
          }

          function stop() {
              if (contentLoader.source == "ContentVideo.qml")
                  contentLoader.item.stop()
              theSource.sourceItem = null
          }
      }