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void writeMHDR( const QSize& size, int framerate )
{
	dev->writeBlock("\212MNG\r\n\032\n", 8);

	struct {
	    int width;
	    int height;
	    int framerate;
	    int a,b,c;
	    int profile;
	} chunk;
	chunk.width = htonl(size.width());
	chunk.height = htonl(size.height());
	chunk.framerate = htonl(framerate);
	chunk.a=0;
	chunk.b=0;
	chunk.c=0;
	chunk.profile= htonl(0x00000003);
  /*     FRAM  , MHDR       */
	png_write_chunk(png_ptr, (png_byte*)"MHDR", (png_byte*)&chunk, sizeof(chunk));
}

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unsigned long
htonl(unsigned long a)
{
	return (a);
}

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The PNG group officially rejected APNG as an official extension on April 20, 2007.[2] There have been several subsequent proposals for a simple animated graphics format based on PNG using several different approaches.[3] Among the maintainers of the PNG and MNG formats, APNG was not received well for several reasons. MNG provides all the features APNG provides, but is not supported at all by PNG-only decoders. APNG uses a technically feasible solution for storing any frames except the first, but the majority of the PNG group thinks this conflicts with the purpose of the PNG format – which is to store a single image. APNG would be compatible to this vision with alterations to its signature and intended MIME type, but these would break the desired backwards compatibility.