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#include "qt7ciimagevideobuffer.h"

QT7CIImageVideoBuffer::QT7CIImageVideoBuffer(CIImage *image)
    : QAbstractVideoBuffer(CoreImageHandle)
    , m_image(image)
    , m_buffer(0)
    , m_mode(NotMapped)
{
    [m_image retain];
}

QT7CIImageVideoBuffer::~QT7CIImageVideoBuffer()
{
    [m_image release];
    [m_buffer release];
}

QAbstractVideoBuffer::MapMode QT7CIImageVideoBuffer::mapMode() const
{
    return m_mode;
}

uchar *QT7CIImageVideoBuffer::map(QAbstractVideoBuffer::MapMode mode, int *numBytes, int *bytesPerLine)
{
    if (mode == NotMapped || m_mode != NotMapped || !m_image)
        return 0;

    if (!m_buffer) {
        //swap R and B channels
        CIFilter *colorSwapFilter = [CIFilter filterWithName: @"CIColorMatrix"  keysAndValues:
                                     @"inputImage", m_image,
                                     @"inputRVector", [CIVector vectorWithX: 0  Y: 0  Z: 1  W: 0],
                                     @"inputGVector", [CIVector vectorWithX: 0  Y: 1  Z: 0  W: 0],
                                     @"inputBVector", [CIVector vectorWithX: 1  Y: 0  Z: 0  W: 0],
                                     @"inputAVector", [CIVector vectorWithX: 0  Y: 0  Z: 0  W: 1],
                                     @"inputBiasVector", [CIVector vectorWithX: 0  Y: 0  Z: 0  W: 0],
                                     nil];
        CIImage *img = [colorSwapFilter valueForKey: @"outputImage"];

        m_buffer = [[NSBitmapImageRep alloc] initWithCIImage:img];
    }

    if (numBytes)
        *numBytes = [m_buffer bytesPerPlane];

    if (bytesPerLine)
        *bytesPerLine = [m_buffer bytesPerRow];

    m_mode = mode;

    return [m_buffer bitmapData];
}

void QT7CIImageVideoBuffer::unmap()
{
    m_mode = NotMapped;
}

QVariant QT7CIImageVideoBuffer::handle() const
{
    return QVariant::fromValue<void*>(m_image);
}