[cairo] TIFF files

[Nadeem Afana]

> From: cloos at jhcloos.com
> To: cairo at cairographics.org
> CC: nadeemafana at live.com
> Subject: Re: [cairo] TIFF files
> Date: Fri, 16 Mar 2012 11:11:59 -0400
> 
> >>>>> "NA" == Nadeem Afana <nadeemafana at live.com> writes:
> 
> NA> How can I generate TIFF files using Cairo and C/C++ in Linux?
> 
> LibTiff.
> 
> Libtiff is well documented (start with >>man libtiff<<.  Each of the
> functions listed under LIST OF ROUTINES has its own man page) and comes
> with some example apps which help document the api.
> 
> As an example, I added this to a test app to write out said app's
> internal CIELAB+Alpha buffer (if cairo had support for colour spaces I
> would have used it to write a pdf...):
> 
>     if (labtif) {
> 	TIFFDefaultStripSize (labtif, height);
>         TIFFSetField (labtif, TIFFTAG_IMAGEWIDTH, width);
>         TIFFSetField (labtif, TIFFTAG_IMAGELENGTH, height);
>         TIFFSetField (labtif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
>         TIFFSetField (labtif, TIFFTAG_SAMPLESPERPIXEL, 4);
>         TIFFSetField (labtif, TIFFTAG_BITSPERSAMPLE, TIFFDataWidth(TIFF_DOUBLE) * 8);
>         TIFFSetField (labtif, TIFFTAG_FILLORDER, FILLORDER_LSB2MSB);
>         TIFFSetField (labtif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
>         TIFFSetField (labtif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_CIELAB);
> 	TIFFSetField (labtif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_IEEEFP);
> 	TIFFSetField (labtif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
> 	TIFFSetField (labtif, TIFFTAG_ROWSPERSTRIP, height );
> 	if (dpi > 0.) {
> 		TIFFSetField (labtif, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
> 		TIFFSetField (labtif, TIFFTAG_XRESOLUTION, dpi );
> 		TIFFSetField (labtif, TIFFTAG_YRESOLUTION, dpi );
> 	}
> 	TIFFWriteRawStrip (labtif, 0, labbuf, len * 4 * sizeof(double));
> 	TIFFClose (labtif);
>     }
> 
> (labtiff is opened with:
> 
> 	labtif = TIFFOpen(optarg, "w");
> 
> inside of a getopt_long(3) block)
> 
> For a more portable app you'd want either to base fillorder on the
> hosts's endianness or ensure the buffer has matching order.  You also
> may want to use some form of compression, etc.
> 
> There are a bunch of fields to set, but the api is straitforward.
> 
> -JimC
> -- 
> James Cloos <cloos at jhcloos.com>         OpenPGP: 1024D/ED7DAEA6
 		 	   		  
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