imfchannellistattribute.cpp

对gif

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// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
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//-----------------------------------------------------------------------------
//
//	class ChannelListAttribute
//
//-----------------------------------------------------------------------------

#include <ImfChannelListAttribute.h>


namespace Imf {


template <>
const char *
ChannelListAttribute::staticTypeName ()
{
    return "chlist";
}


template <>
void
ChannelListAttribute::writeValueTo (OStream &os, int version) const
{
    for (ChannelList::ConstIterator i = _value.begin();
	 i != _value.end();
	 ++i)
    {
	//
	// Write name
	//

	Xdr::write <StreamIO> (os, i.name());

	//
	// Write Channel struct
	//

	Xdr::write <StreamIO> (os, int (i.channel().type));
	Xdr::write <StreamIO> (os, i.channel().pLinear);
	Xdr::pad   <StreamIO> (os, 3);
	Xdr::write <StreamIO> (os, i.channel().xSampling);
	Xdr::write <StreamIO> (os, i.channel().ySampling);
    }

    //
    // Write end of list marker
    //

    Xdr::write <StreamIO> (os, "");
}


template <>
void
ChannelListAttribute::readValueFrom (IStream &is, int size, int version)
{
    while (true)
    {
	//
	// Read name; zero length name means end of channel list
	//

	char name[Name::SIZE];
	Xdr::read <StreamIO> (is, sizeof (name), name);

	if (name[0] == 0)
	    break;

	//
	// Read Channel struct
	//

	int type;
	bool pLinear;
	int xSampling;
	int ySampling;

	Xdr::read <StreamIO> (is, type);
	Xdr::read <StreamIO> (is, pLinear);
	Xdr::skip <StreamIO> (is, 3);
	Xdr::read <StreamIO> (is, xSampling);
	Xdr::read <StreamIO> (is, ySampling);

	_value.insert
	    (name, Channel (PixelType (type), xSampling, ySampling, pLinear));
    }
}


} // namespace Imf