contextattributes.cpp

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**
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#include "contextattributes_p.h"

#include <QVariantMap>
#include <QDebug>

QT_BEGIN_NAMESPACE
QT_CANVAS3D_BEGIN_NAMESPACE

/*!
 * \qmltype ContextAttributes
 * \since QtCanvas3D 1.0
 * \ingroup qtcanvas3d-qml-types
 * \brief Attribute set for Context3D
 *
 * ContextAttributes is an attribute set that can be given as parameter on first call to
 * Canvas3D object's \l{Canvas3D::getContext}{getContext(string type, ContextAttributes options)}
 * method call. It can also be requested from the Context3D later on to verify what exact
 * attributes are in fact enabled/disabled in the created context.
 *
 * \sa Context3D, Canvas3D, {QtCanvas3D QML Types}
 */

/*!
 * \internal
 */
CanvasContextAttributes::CanvasContextAttributes(QObject *parent) :
    CanvasAbstractObject(parent),
    m_alpha(false),  // Should be true according to official WebGL spec. But ignored for now.
    m_depth(false),
    m_stencil(false),
    m_antialias(false),
    m_premultipliedAlpha(false),
    m_preserveDrawingBuffer(false),
    m_preferLowPowerToHighPerformance(false),
    m_failIfMajorPerformanceCaveat(false)
{
}

/*!
 * \internal
 */
CanvasContextAttributes::~CanvasContextAttributes()
{
}

/*!
 * \internal
 */
void CanvasContextAttributes::setFrom(const QVariantMap &options)
{
    for (QVariantMap::const_iterator iter = options.begin(); iter != options.end(); ++iter) {
        if (iter.key() == "alpha")
            setAlpha(iter.value().toBool());
        else if (iter.key() == "depth")
            setDepth(iter.value().toBool());
        else if (iter.key() == "stencil")
            setStencil(iter.value().toBool());
        else if (iter.key() == "antialias")
            setAntialias(iter.value().toBool());
        else if (iter.key() == "premultipliedAlpha")
            setPremultipliedAlpha(iter.value().toBool());
        else if (iter.key() == "preserveDrawingBuffer")
            setPreserveDrawingBuffer(iter.value().toBool());
        else if (iter.key() == "preferLowPowerToHighPerformance")
            setPreferLowPowerToHighPerformance(iter.value().toBool());
        else if (iter.key() == "failIfMajorPerformanceCaveat")
            setFailIfMajorPerformanceCaveat(iter.value().toBool());
    }
}

/*!
 * \internal
 */
void CanvasContextAttributes::setFrom(const CanvasContextAttributes &source)
{
    m_alpha = source.alpha();
    m_depth = source.depth();
    m_stencil = source.stencil();
    m_antialias = source.antialias();
    m_premultipliedAlpha = source.premultipliedAlpha();
    m_preserveDrawingBuffer = source.preserveDrawingBuffer();
    m_preferLowPowerToHighPerformance = source.preferLowPowerToHighPerformance();
    m_failIfMajorPerformanceCaveat = source.failIfMajorPerformanceCaveat();
}

/*!
 * \qmlproperty bool ContextAttributes::alpha
 * Ignored. Defaults to \c{false}.
 */
bool CanvasContextAttributes::alpha()  const
{
    return m_alpha;
}

void CanvasContextAttributes::setAlpha(bool value)
{
    if (m_alpha == value)
        return;

    m_alpha = value;
    emit alphaChanged(value);
}

/*!
 * \qmlproperty bool ContextAttributes::depth
 * Specifies whether a depth attachment is to be created and attached to the default render target
 * of the Context3D.
 * Defaults to \c{false}.
 */
bool CanvasContextAttributes::depth() const
{
    return m_depth;
}

void CanvasContextAttributes::setDepth(bool value)
{
    if (m_depth == value)
        return;

    m_depth = value;
    emit depthChanged(value);
}

/*!
 * \qmlproperty bool ContextAttributes::stencil
 * Specifies whether a stencil attachment is to be created and attached to the default render
 * target of the Context3D.
 * Defaults to \c{false}.
 */
bool CanvasContextAttributes::stencil() const
{
    return m_stencil;
}

void CanvasContextAttributes::setStencil(bool value)
{
    if (m_stencil == value)
        return;

    m_stencil = value;
    emit stencilChanged(value);
}

/*!
 * \qmlproperty bool ContextAttributes::antialias
 * Specifies whether antialiasing buffer is created for the default render target of the Context3D.
 * Defaults to \c{false}.
 */
bool CanvasContextAttributes::antialias() const
{
    return m_antialias;
}

void CanvasContextAttributes::setAntialias(bool value)
{
    if (m_antialias == value)
        return;

    m_antialias = value;
    emit antialiasChanged(value);
}

/*!
 * \qmlproperty bool ContextAttributes::premultipliedAlpha
 * Ignored. Defaults to \c{false}.
 */
bool CanvasContextAttributes::premultipliedAlpha() const
{
    return m_premultipliedAlpha;
}

void CanvasContextAttributes::setPremultipliedAlpha(bool value)
{
    if (m_premultipliedAlpha == value)
        return;

    m_premultipliedAlpha = value;
    emit premultipliedAlphaChanged(value);
}

/*!
 * \qmlproperty bool ContextAttributes::preserveDrawingBuffer
 * Ignored. Defaults to \c{false}.
 */
bool CanvasContextAttributes::preserveDrawingBuffer() const
{
    return m_preserveDrawingBuffer;
}

void CanvasContextAttributes::setPreserveDrawingBuffer(bool value)
{
    if (m_preserveDrawingBuffer == value)
        return;

    m_preserveDrawingBuffer = value;
    emit preserveDrawingBufferChanged(value);
}

/*!
 * \qmlproperty bool ContextAttributes::preferLowPowerToHighPerformance
 * Ignored. Defaults to \c{false}.
 */
bool CanvasContextAttributes::preferLowPowerToHighPerformance() const
{
    return m_preferLowPowerToHighPerformance;
}

void CanvasContextAttributes::setPreferLowPowerToHighPerformance(bool value)
{
    if (m_preferLowPowerToHighPerformance == value)
        return;

    m_preferLowPowerToHighPerformance = value;
    emit preferLowPowerToHighPerformanceChanged(value);
}

/*!
 * \qmlproperty bool ContextAttributes::failIfMajorPerformanceCaveat
 * Ignored. Defaults to \c{false}.
 */
bool CanvasContextAttributes::failIfMajorPerformanceCaveat() const
{
    return m_failIfMajorPerformanceCaveat;
}

void CanvasContextAttributes::setFailIfMajorPerformanceCaveat(bool value)
{
    if (m_failIfMajorPerformanceCaveat == value)
        return;

    m_failIfMajorPerformanceCaveat = value;
    emit failIfMajorPerformanceCaveatChanged(value);
}

/*!
 * \internal
 */
QDebug operator<<(QDebug dbg, const CanvasContextAttributes &attribs)
{
    dbg.nospace() << "ContextAttributes(\n    alpha:"<< attribs.m_alpha  <<
                     "\n    depth:" << attribs.m_depth <<
                     "\n    m_stencil:" << attribs.m_stencil <<
                     "\n    antialias:"<< attribs.m_antialias <<
                     "\n    premultipliedAlpha:" << attribs.m_premultipliedAlpha <<
                     "\n    preserveDrawingBuffer:" << attribs.m_preserveDrawingBuffer <<
                     "\n    preferLowPowerToHighPerformance:" << attribs.m_preferLowPowerToHighPerformance <<
                     "\n    failIfMajorPerformanceCaveat:" << attribs.m_failIfMajorPerformanceCaveat << ")";
    return dbg.maybeSpace();
}

QT_CANVAS3D_END_NAMESPACE
QT_END_NAMESPACE