Allow plugins to override the QML VideoOutput type.

Move QDeclarativeVideoOutput to the private QtMultimediaQuickTools
library to make the QDeclarativeVideoOutputBackend interface
implementable by a plugin.

Change-Id: I763c483a1fc9ec56dc7b8be0bc71523f029a36ee
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

1 files changed, 289 insertions, 0 deletions

diff --git a/src/qtmultimediaquicktools/qsgvideonode_rgb.cpp b/src/qtmultimediaquicktools/qsgvideonode_rgb.cpp
new file mode 100644
index 000000000..fbe60c9a7
--- /dev/null
+++ b/src/qtmultimediaquicktools/qsgvideonode_rgb.cpp
@@ -0,0 +1,289 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 "qsgvideonode_rgb.h"
+#include <QtQuick/qsgtexturematerial.h>
+#include <QtQuick/qsgmaterial.h>
+#include <QtCore/qmutex.h>
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QOpenGLFunctions>
+#include <QtGui/QOpenGLShaderProgram>
+
+QT_BEGIN_NAMESPACE
+
+QList<QVideoFrame::PixelFormat> QSGVideoNodeFactory_RGB::supportedPixelFormats(
+                                        QAbstractVideoBuffer::HandleType handleType) const
+{
+    QList<QVideoFrame::PixelFormat> pixelFormats;
+
+    if (handleType == QAbstractVideoBuffer::NoHandle) {
+        pixelFormats.append(QVideoFrame::Format_RGB565);
+        pixelFormats.append(QVideoFrame::Format_RGB32);
+        pixelFormats.append(QVideoFrame::Format_ARGB32);
+        pixelFormats.append(QVideoFrame::Format_BGR32);
+        pixelFormats.append(QVideoFrame::Format_BGRA32);
+    }
+
+    return pixelFormats;
+}
+
+QSGVideoNode *QSGVideoNodeFactory_RGB::createNode(const QVideoSurfaceFormat &format)
+{
+    if (supportedPixelFormats(format.handleType()).contains(format.pixelFormat()))
+        return new QSGVideoNode_RGB(format);
+
+    return 0;
+}
+
+
+class QSGVideoMaterialShader_RGB : public QSGMaterialShader
+{
+public:
+    QSGVideoMaterialShader_RGB(QVideoFrame::PixelFormat pixelFormat)
+        : QSGMaterialShader(),
+          m_id_matrix(-1),
+          m_id_rgbTexture(-1),
+          m_id_opacity(-1),
+          m_pixelFormat(pixelFormat)
+    {
+    }
+
+    void updateState(const RenderState &state, QSGMaterial *newMaterial, QSGMaterial *oldMaterial);
+
+    virtual char const *const *attributeNames() const {
+        static const char *names[] = {
+            "qt_VertexPosition",
+            "qt_VertexTexCoord",
+            0
+        };
+        return names;
+    }
+
+protected:
+
+    virtual const char *vertexShader() const {
+        const char *shader =
+        "uniform highp mat4 qt_Matrix;                      \n"
+        "attribute highp vec4 qt_VertexPosition;            \n"
+        "attribute highp vec2 qt_VertexTexCoord;            \n"
+        "varying highp vec2 qt_TexCoord;                    \n"
+        "void main() {                                      \n"
+        "    qt_TexCoord = qt_VertexTexCoord;               \n"
+        "    gl_Position = qt_Matrix * qt_VertexPosition;   \n"
+        "}";
+        return shader;
+    }
+
+    virtual const char *fragmentShader() const {
+        static const char *shader =
+        "uniform sampler2D rgbTexture;"
+        "uniform lowp float opacity;"
+        ""
+        "varying highp vec2 qt_TexCoord;"
+        ""
+        "void main()"
+        "{"
+        "    gl_FragColor = texture2D(rgbTexture, qt_TexCoord) * opacity;"
+        "}";
+
+        static const char *colorsSwapShader =
+        "uniform sampler2D rgbTexture;"
+        "uniform lowp float opacity;"
+        ""
+        "varying highp vec2 qt_TexCoord;"
+        ""
+        "void main()"
+        "{"
+        "    gl_FragColor =  vec4(texture2D(rgbTexture, qt_TexCoord).bgr, 1.0) * opacity;"
+        "}";
+
+
+        switch (m_pixelFormat) {
+            case QVideoFrame::Format_RGB32:
+            case QVideoFrame::Format_ARGB32:
+                return colorsSwapShader;
+            default:
+                return shader;
+        }
+    }
+
+    virtual void initialize() {
+        m_id_matrix = program()->uniformLocation("qt_Matrix");
+        m_id_rgbTexture = program()->uniformLocation("rgbTexture");
+        m_id_opacity = program()->uniformLocation("opacity");
+    }
+
+    int m_id_matrix;
+    int m_id_rgbTexture;
+    int m_id_opacity;
+    QVideoFrame::PixelFormat m_pixelFormat;
+};
+
+
+class QSGVideoMaterial_RGB : public QSGMaterial
+{
+public:
+    QSGVideoMaterial_RGB(const QVideoSurfaceFormat &format) :
+        m_format(format),
+        m_textureId(0),
+        m_opacity(1.0)
+    {
+        setFlag(Blending, false);
+    }
+
+    ~QSGVideoMaterial_RGB()
+    {
+        if (m_textureId)
+            glDeleteTextures(1, &m_textureId);
+    }
+
+    virtual QSGMaterialType *type() const {
+        static QSGMaterialType theType;
+        return &theType;
+    }
+
+    virtual QSGMaterialShader *createShader() const {
+        return new QSGVideoMaterialShader_RGB(m_format.pixelFormat());
+    }
+
+    virtual int compare(const QSGMaterial *other) const {
+        const QSGVideoMaterial_RGB *m = static_cast<const QSGVideoMaterial_RGB *>(other);
+        return m_textureId - m->m_textureId;
+    }
+
+    void updateBlending() {
+        setFlag(Blending, qFuzzyCompare(m_opacity, qreal(1.0)) ? false : true);
+    }
+
+    void setVideoFrame(const QVideoFrame &frame) {
+        QMutexLocker lock(&m_frameMutex);
+        m_frame = frame;
+    }
+
+    void bind()
+    {
+        QOpenGLFunctions *functions = QOpenGLContext::currentContext()->functions();
+
+        QMutexLocker lock(&m_frameMutex);
+        if (m_frame.isValid()) {
+            if (m_frame.map(QAbstractVideoBuffer::ReadOnly)) {
+                if (m_textureSize != m_frame.size()) {
+                    if (!m_textureSize.isEmpty())
+                        glDeleteTextures(1, &m_textureId);
+                    glGenTextures(1, &m_textureId);
+                    m_textureSize = m_frame.size();
+                }
+
+                GLint dataType = GL_UNSIGNED_BYTE;
+                GLint dataFormat = GL_RGBA;
+
+                if (m_frame.pixelFormat() == QVideoFrame::Format_RGB565) {
+                    dataType = GL_UNSIGNED_SHORT_5_6_5;
+                    dataFormat = GL_RGB;
+                }
+
+                functions->glActiveTexture(GL_TEXTURE0);
+                glBindTexture(GL_TEXTURE_2D, m_textureId);
+                glTexImage2D(GL_TEXTURE_2D, 0, dataFormat,
+                             m_textureSize.width(), m_textureSize.height(),
+                             0, dataFormat, dataType, m_frame.bits());
+
+                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_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);
+
+                m_frame.unmap();
+            }
+            m_frame = QVideoFrame();
+        } else {
+            functions->glActiveTexture(GL_TEXTURE0);
+            glBindTexture(GL_TEXTURE_2D, m_textureId);
+        }
+    }
+
+    QVideoFrame m_frame;
+    QMutex m_frameMutex;
+    QSize m_textureSize;
+    QVideoSurfaceFormat m_format;
+    GLuint m_textureId;
+    qreal m_opacity;
+};
+
+
+QSGVideoNode_RGB::QSGVideoNode_RGB(const QVideoSurfaceFormat &format) :
+    m_format(format)
+{
+    setFlag(QSGNode::OwnsMaterial);
+    m_material = new QSGVideoMaterial_RGB(format);
+    setMaterial(m_material);
+}
+
+QSGVideoNode_RGB::~QSGVideoNode_RGB()
+{
+}
+
+void QSGVideoNode_RGB::setCurrentFrame(const QVideoFrame &frame)
+{
+    m_material->setVideoFrame(frame);
+    markDirty(DirtyMaterial);
+}
+
+void QSGVideoMaterialShader_RGB::updateState(const RenderState &state,
+                                                QSGMaterial *newMaterial,
+                                                QSGMaterial *oldMaterial)
+{
+    Q_UNUSED(oldMaterial);
+    QSGVideoMaterial_RGB *mat = static_cast<QSGVideoMaterial_RGB *>(newMaterial);
+    program()->setUniformValue(m_id_rgbTexture, 0);
+
+    mat->bind();
+
+    if (state.isOpacityDirty()) {
+        mat->m_opacity = state.opacity();
+        mat->updateBlending();
+        program()->setUniformValue(m_id_opacity, GLfloat(mat->m_opacity));
+    }
+
+    if (state.isMatrixDirty())
+        program()->setUniformValue(m_id_matrix, state.combinedMatrix());
+}
+
+QT_END_NAMESPACE