//

// SPDX-License-Identifier: BSD-3-Clause

// Copyright (c) Contributors to the OpenEXR Project.

//

//-----------------------------------------------------------------------------

//

//  class PreviewImageAttribute

//

//-----------------------------------------------------------------------------

#define COMPILING_IMF_PREVIEW_IMAGE_ATTRIBUTE

#include "ImfPreviewImageAttribute.h"

#if defined(_MSC_VER)

// suppress warning about non-exported base classes

#    pragma warning(disable : 4251)

#    pragma warning(disable : 4275)

#endif

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER

using namespace OPENEXR_IMF_INTERNAL_NAMESPACE;

template <>

IMF_EXPORT const char*

PreviewImageAttribute::staticTypeName ()

{

    return "preview";

}

template <>

IMF_EXPORT void

PreviewImageAttribute::writeValueTo (

    OPENEXR_IMF_INTERNAL_NAMESPACE::OStream& os, int version) const

{

    Xdr::write<StreamIO> (os, _value.width ());

    Xdr::write<StreamIO> (os, _value.height ());

    int                numPixels = _value.width () * _value.height ();

    const PreviewRgba* pixels    = _value.pixels ();

    for (int i = 0; i < numPixels; ++i)

    {

        Xdr::write<StreamIO> (os, pixels[i].r);

        Xdr::write<StreamIO> (os, pixels[i].g);

        Xdr::write<StreamIO> (os, pixels[i].b);

        Xdr::write<StreamIO> (os, pixels[i].a);

    }

}

template <>

IMF_EXPORT void

PreviewImageAttribute::readValueFrom (

    OPENEXR_IMF_INTERNAL_NAMESPACE::IStream& is, int size, int version)

{

    int width, height;

    Xdr::read<StreamIO> (is, width);

    Xdr::read<StreamIO> (is, height);

    if (width < 0 || height < 0)

    {

        throw IEX_NAMESPACE::InputExc (

            "Invalid dimensions in Preview Image Attribute");

    }

    // total attribute size should be four bytes per pixel + 8 bytes for width and height dimensions

    if (static_cast<uint64_t> (width) * static_cast<uint64_t> (height) * 4l +

            8l !=

        static_cast<uint64_t> (size))

    {

        throw IEX_NAMESPACE::InputExc (

            "Mismatch between Preview Image Attribute size and dimensions");

    }

    PreviewImage p (width, height);

    int          numPixels = p.width () * p.height ();

    PreviewRgba* pixels    = p.pixels ();

    for (int i = 0; i < numPixels; ++i)

    {

        Xdr::read<StreamIO> (is, pixels[i].r);

        Xdr::read<StreamIO> (is, pixels[i].g);

        Xdr::read<StreamIO> (is, pixels[i].b);

        Xdr::read<StreamIO> (is, pixels[i].a);

    }

    _value = p;

}

template class IMF_EXPORT_TEMPLATE_INSTANCE

    TypedAttribute<OPENEXR_IMF_INTERNAL_NAMESPACE::PreviewImage>;

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT