/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the commercial license agreement provided with the
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** 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
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****************************************************************************/

#include "qsgvideonode_p.h"

QT_BEGIN_NAMESPACE

QSGVideoNode::QSGVideoNode()
    : m_orientation(-1)
{
}

/* Helpers */
static inline void qSetGeom(QSGGeometry::TexturedPoint2D *v, const QPointF &p)
{
    v->x = p.x();
    v->y = p.y();
}

static inline void qSetTex(QSGGeometry::TexturedPoint2D *v, const QPointF &p)
{
    v->tx = p.x();
    v->ty = p.y();
}

/* Update the vertices and texture coordinates.  Orientation must be in {0,90,180,270} */
void QSGVideoNode::setTexturedRectGeometry(const QRectF &rect, const QRectF &textureRect, int orientation)
{
    if (rect == m_rect && textureRect == m_textureRect && orientation == m_orientation)
        return;

    m_rect = rect;
    m_textureRect = textureRect;
    m_orientation = orientation;

    QSGGeometry *g = geometry();

    if (g == 0)
        g = new QSGGeometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 4);

    QSGGeometry::TexturedPoint2D *v = g->vertexDataAsTexturedPoint2D();

    // Set geometry first
    qSetGeom(v + 0, rect.topLeft());
    qSetGeom(v + 1, rect.bottomLeft());
    qSetGeom(v + 2, rect.topRight());
    qSetGeom(v + 3, rect.bottomRight());

    // and then texture coordinates
    switch (orientation) {
        default:
            // tl, bl, tr, br
            qSetTex(v + 0, textureRect.topLeft());
            qSetTex(v + 1, textureRect.bottomLeft());
            qSetTex(v + 2, textureRect.topRight());
            qSetTex(v + 3, textureRect.bottomRight());
            break;

        case 90:
            // tr, tl, br, bl
            qSetTex(v + 0, textureRect.topRight());
            qSetTex(v + 1, textureRect.topLeft());
            qSetTex(v + 2, textureRect.bottomRight());
            qSetTex(v + 3, textureRect.bottomLeft());
            break;

        case 180:
            // br, tr, bl, tl
            qSetTex(v + 0, textureRect.bottomRight());
            qSetTex(v + 1, textureRect.topRight());
            qSetTex(v + 2, textureRect.bottomLeft());
            qSetTex(v + 3, textureRect.topLeft());
            break;

        case 270:
            // bl, br, tl, tr
            qSetTex(v + 0, textureRect.bottomLeft());
            qSetTex(v + 1, textureRect.bottomRight());
            qSetTex(v + 2, textureRect.topLeft());
            qSetTex(v + 3, textureRect.topRight());
            break;
    }

    if (!geometry())
        setGeometry(g);

    markDirty(DirtyGeometry);
}

QT_END_NAMESPACE
