/******************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Quick Ultralite module.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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
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** and conditions see http://www.qt.io/terms-conditions. For further
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** $QT_END_LICENSE$
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******************************************************************************/

#include <qul/painteditemdelegate.h>
#include <qul/image.h>

#include <platforminterface/drawingdevice.h>
#include <platforminterface/rect.h>
#include <platforminterface/rgba32.h>

#ifdef QUL_TVIIC_PLATFORM
#include <ut_class_surface.h>
#endif

class GaussianBlurDelegate : public Qul::PaintedItemDelegate
{
public:
    Qul::Property<double> blur;
    Qul::Property<Qul::SharedImage> source;

    void blurChanged();

    Qul::PlatformInterface::Rect boundingRect(Qul::PlatformInterface::Size size) const override;

    void paint(Qul::PlatformInterface::DrawingDevice *device,
               const Qul::PlatformInterface::Rect &clip,
               const Qul::PlatformInterface::Transform &transform,
               Qul::PlatformInterface::Size size,
               float opacity) const override;

private:
    float blurValue() const
    {
        if (blur.value() < 0)
            return 0;
        // Blur values above 2.5 cause graphical glitches on TRAVEO™ T2G
        if (blur.value() > 2.5)
            return 2.5;
        return blur.value();
    }

    mutable bool m_initialized = false;
    mutable bool m_blurDirty = true;
#ifdef QUL_TVIIC_PLATFORM
    mutable CSurface<1> m_source;
    mutable CSurface<1> m_blurred[3];
    mutable int m_index = 0;
#endif
};