qtmultimedia/src/plugins/gstreamer/camerabin/camerabinimageprocessing.cpp

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#include "camerabinimageprocessing.h"
#include "camerabinsession.h"

#include <gst/interfaces/colorbalance.h>

QT_BEGIN_NAMESPACE

CameraBinImageProcessing::CameraBinImageProcessing(CameraBinSession *session)
    :QCameraImageProcessingControl(session),
     m_session(session)
{
#ifdef HAVE_GST_PHOTOGRAPHY
    m_mappedWbValues[GST_PHOTOGRAPHY_WB_MODE_AUTO] = QCameraImageProcessing::WhiteBalanceAuto;
    m_mappedWbValues[GST_PHOTOGRAPHY_WB_MODE_DAYLIGHT] = QCameraImageProcessing::WhiteBalanceSunlight;
    m_mappedWbValues[GST_PHOTOGRAPHY_WB_MODE_CLOUDY] = QCameraImageProcessing::WhiteBalanceCloudy;
    m_mappedWbValues[GST_PHOTOGRAPHY_WB_MODE_SUNSET] = QCameraImageProcessing::WhiteBalanceSunset;
    m_mappedWbValues[GST_PHOTOGRAPHY_WB_MODE_TUNGSTEN] = QCameraImageProcessing::WhiteBalanceTungsten;
    m_mappedWbValues[GST_PHOTOGRAPHY_WB_MODE_FLUORESCENT] = QCameraImageProcessing::WhiteBalanceFluorescent;
#endif

    updateColorBalanceValues();
}

CameraBinImageProcessing::~CameraBinImageProcessing()
{
}

void CameraBinImageProcessing::updateColorBalanceValues()
{
    if (!GST_IS_COLOR_BALANCE(m_session->cameraBin())) {
        // Camerabin doesn't implement gstcolorbalance interface
        return;
    }

    GstColorBalance *balance = GST_COLOR_BALANCE(m_session->cameraBin());
    const GList *controls = gst_color_balance_list_channels(balance);

    const GList *item;
    GstColorBalanceChannel *channel;
    gint cur_value;
    qreal scaledValue = 0;

    for (item = controls; item; item = g_list_next (item)) {
        channel = (GstColorBalanceChannel *)item->data;
        cur_value = gst_color_balance_get_value (balance, channel);

        //map the [min_value..max_value] range to [-1.0 .. 1.0]
        if (channel->min_value != channel->max_value) {
            scaledValue = qreal(cur_value - channel->min_value) /
                    (channel->max_value - channel->min_value) * 2 - 1;
        }

        if (!g_ascii_strcasecmp (channel->label, "brightness")) {
            m_values[QCameraImageProcessingControl::BrightnessAdjustment] = scaledValue;
        } else if (!g_ascii_strcasecmp (channel->label, "contrast")) {
            m_values[QCameraImageProcessingControl::ContrastAdjustment] = scaledValue;
        } else if (!g_ascii_strcasecmp (channel->label, "saturation")) {
            m_values[QCameraImageProcessingControl::SaturationAdjustment] = scaledValue;
        }
    }
}

bool CameraBinImageProcessing::setColorBalanceValue(const QString& channel, qreal value)
{

    if (!GST_IS_COLOR_BALANCE(m_session->cameraBin())) {
        // Camerabin doesn't implement gstcolorbalance interface
        return false;
    }

    GstColorBalance *balance = GST_COLOR_BALANCE(m_session->cameraBin());
    const GList *controls = gst_color_balance_list_channels(balance);

    const GList *item;
    GstColorBalanceChannel *colorBalanceChannel;

    for (item = controls; item; item = g_list_next (item)) {
        colorBalanceChannel = (GstColorBalanceChannel *)item->data;

        if (!g_ascii_strcasecmp (colorBalanceChannel->label, channel.toLatin1())) {
            //map the [-1.0 .. 1.0] range to [min_value..max_value]
            gint scaledValue = colorBalanceChannel->min_value + qRound(
                        (value+1.0)/2.0 * (colorBalanceChannel->max_value - colorBalanceChannel->min_value));

            gst_color_balance_set_value (balance, colorBalanceChannel, scaledValue);
            return true;
        }
    }

    return false;
}

QCameraImageProcessing::WhiteBalanceMode CameraBinImageProcessing::whiteBalanceMode() const
{
#ifdef HAVE_GST_PHOTOGRAPHY
    GstWhiteBalanceMode wbMode;
    gst_photography_get_white_balance_mode(m_session->photography(), &wbMode);
    return m_mappedWbValues[wbMode];
#else
    return QCameraImageProcessing::WhiteBalanceAuto;
#endif
}

void CameraBinImageProcessing::setWhiteBalanceMode(QCameraImageProcessing::WhiteBalanceMode mode)
{
#ifdef HAVE_GST_PHOTOGRAPHY
    if (isWhiteBalanceModeSupported(mode))
        gst_photography_set_white_balance_mode(m_session->photography(), m_mappedWbValues.key(mode));
#else
    Q_UNUSED(mode);
#endif
}

bool CameraBinImageProcessing::isWhiteBalanceModeSupported(QCameraImageProcessing::WhiteBalanceMode mode) const
{
#ifdef HAVE_GST_PHOTOGRAPHY
    return m_mappedWbValues.values().contains(mode);
#else
    return mode == QCameraImageProcessing::WhiteBalanceAuto;
#endif
}

bool CameraBinImageProcessing::isParameterSupported(QCameraImageProcessingControl::ProcessingParameter parameter) const
{
    return parameter == QCameraImageProcessingControl::Contrast
            || parameter == QCameraImageProcessingControl::Brightness
            || parameter == QCameraImageProcessingControl::Saturation
            || parameter == QCameraImageProcessingControl::WhiteBalancePreset;
}

bool CameraBinImageProcessing::isParameterValueSupported(QCameraImageProcessingControl::ProcessingParameter parameter, const QVariant &value) const
{
    switch (parameter) {
    case ContrastAdjustment:
    case BrightnessAdjustment:
    case SaturationAdjustment:
        return qAbs(value.toReal()) <= 1.0;
    case WhiteBalancePreset:
        return isWhiteBalanceModeSupported(value.value<QCameraImageProcessing::WhiteBalanceMode>());
    default:
        break;
    }

    return false;
}

QVariant CameraBinImageProcessing::parameter(
        QCameraImageProcessingControl::ProcessingParameter parameter) const
{
    if (m_values.contains(parameter))
        return m_values.value(parameter);
    else
        return QVariant();
}

void CameraBinImageProcessing::setParameter(QCameraImageProcessingControl::ProcessingParameter parameter,
        const QVariant &value)
{
    switch (parameter) {
    case ContrastAdjustment:
        setColorBalanceValue("contrast", value.toReal());
        break;
    case BrightnessAdjustment:
        setColorBalanceValue("brightness", value.toReal());
        break;
    case SaturationAdjustment:
        setColorBalanceValue("saturation", value.toReal());
        break;
    case WhiteBalancePreset:
        setWhiteBalanceMode(value.value<QCameraImageProcessing::WhiteBalanceMode>());
        break;
    default:
        break;
    }

    updateColorBalanceValues();
}

QT_END_NAMESPACE