Add MediaPlayer support to AVFoundation plugin

This plugin would be used on Mac 10.7+ where without the QuickTime C API
our QT7 media player performance was crippled.

Change-Id: Iaadb1990a8f63393c4cd02d096624e0fed42b40f
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Jason Barron <jason.barron@digia.com>
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

src/plugins/avfoundation/mediaplayer/avfvideowidget.mm

@@ -0,0 +1,201 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "avfvideowidget.h"
+#include <QtCore/QDebug>
+#include <QtGui/QOpenGLShaderProgram>
+
+QT_USE_NAMESPACE
+
+AVFVideoWidget::AVFVideoWidget(QWidget *parent, const QGLFormat &format)
+    : QGLWidget(format, parent)
+    , m_textureId(0)
+    , m_aspectRatioMode(Qt::KeepAspectRatio)
+    , m_shaderProgram(0)
+{
+    setAutoFillBackground(false);
+}
+
+AVFVideoWidget::~AVFVideoWidget()
+{
+#ifdef QT_DEBUG_AVF
+    qDebug() << Q_FUNC_INFO;
+#endif
+    delete m_shaderProgram;
+}
+
+void AVFVideoWidget::initializeGL()
+{
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+
+    m_shaderProgram = new QOpenGLShaderProgram;
+
+    static const char *textureVertexProgram =
+            "uniform highp mat4 matrix;\n"
+            "attribute highp vec3 vertexCoordEntry;\n"
+            "attribute highp vec2 textureCoordEntry;\n"
+            "varying highp vec2 textureCoord;\n"
+            "void main() {\n"
+            "   textureCoord = textureCoordEntry;\n"
+            "   gl_Position = matrix * vec4(vertexCoordEntry, 1);\n"
+            "}\n";
+
+    static const char *textureFragmentProgram =
+            "uniform sampler2D texture;\n"
+            "varying highp vec2 textureCoord;\n"
+            "void main() {\n"
+            "   gl_FragColor = texture2D(texture, textureCoord);\n"
+            "}\n";
+
+    m_shaderProgram->addShaderFromSourceCode(QOpenGLShader::Vertex, textureVertexProgram);
+    m_shaderProgram->addShaderFromSourceCode(QOpenGLShader::Fragment, textureFragmentProgram);
+    m_shaderProgram->link();
+}
+
+void AVFVideoWidget::resizeGL(int w, int h)
+{
+    glViewport(0, 0, GLsizei(w), GLsizei(h));
+    updateGL();
+}
+
+void AVFVideoWidget::paintGL()
+{
+    glClear(GL_COLOR_BUFFER_BIT);
+    if (!m_textureId)
+        return;
+
+    QRect targetRect = displayRect();
+    int x1 = targetRect.left();
+    int x2 = targetRect.right();
+    int y1 = targetRect.bottom();
+    int y2 = targetRect.top();
+    int zValue = 0;
+
+    const GLfloat textureCoordinates[] = {
+        0, 0,
+        1, 0,
+        1, 1,
+        0, 1
+    };
+
+    const GLfloat vertexCoordinates[] = {
+        x1, y1, zValue,
+        x2, y1, zValue,
+        x2, y2, zValue,
+        x1, y2, zValue
+    };
+
+    //Set matrix to transfrom geometry values into gl coordinate space.
+    m_transformMatrix.setToIdentity();
+    m_transformMatrix.scale( 2.0f / size().width(), 2.0f / size().height() );
+    m_transformMatrix.translate(-size().width() / 2.0f, -size().height() / 2.0f);
+
+    m_shaderProgram->bind();
+
+    m_vertexCoordEntry = m_shaderProgram->attributeLocation("vertexCoordEntry");
+    m_textureCoordEntry = m_shaderProgram->attributeLocation("textureCoordEntry");
+    m_matrixLocation = m_shaderProgram->uniformLocation("matrix");
+
+    //attach the data!
+    glEnableVertexAttribArray(m_vertexCoordEntry);
+    glEnableVertexAttribArray(m_textureCoordEntry);
+
+    glVertexAttribPointer(m_vertexCoordEntry, 3, GL_FLOAT, GL_FALSE, 0, vertexCoordinates);
+    glVertexAttribPointer(m_textureCoordEntry, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinates);
+    m_shaderProgram->setUniformValue(m_matrixLocation, m_transformMatrix);
+
+    glBindTexture(GL_TEXTURE_2D, m_textureId);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    glDisableVertexAttribArray(m_vertexCoordEntry);
+    glDisableVertexAttribArray(m_textureCoordEntry);
+
+    m_shaderProgram->release();
+}
+
+void AVFVideoWidget::setTexture(GLuint texture)
+{
+    m_textureId = texture;
+
+    if (isVisible()) {
+        makeCurrent();
+        updateGL();
+    }
+}
+
+QSize AVFVideoWidget::sizeHint() const
+{
+    return m_nativeSize;
+}
+
+void AVFVideoWidget::setNativeSize(const QSize &size)
+{
+    m_nativeSize = size;
+}
+
+void AVFVideoWidget::setAspectRatioMode(Qt::AspectRatioMode mode)
+{
+    if (m_aspectRatioMode != mode) {
+        m_aspectRatioMode = mode;
+        update();
+    }
+}
+
+QRect AVFVideoWidget::displayRect() const
+{
+    QRect displayRect = rect();
+
+    if (m_aspectRatioMode == Qt::KeepAspectRatio) {
+        QSize size = m_nativeSize;
+        size.scale(displayRect.size(), Qt::KeepAspectRatio);
+
+        displayRect = QRect(QPoint(0, 0), size);
+        displayRect.moveCenter(rect().center());
+    }
+    return displayRect;
+}