[PATCH] fix jbig in tiff container

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libtiff jbig (en|de)coder supports only TIFFReadEncodedStrip (and encoder only
supports single whole-image strip); gm tries to use either ScanlineMethod, or
StripMethod depending on strip size in decoder, and always use ScanlineMethod in
encoder. Decoder fails with larger samples, encoder always fails. Force
StripMethod in tiff decoder for JBIG codec.

Unsolved: encoder side.

Samples for testing can be obtained by converting bi-level tiff to jbig by
tiffcp -r -1 -c jbig in-ccitt-g4.tiff out-jbig.tiff

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 name="GraphicsMagick-1.3.20-tiff-jbig.patch"
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--- GraphicsMagick-1.3.20/coders/tiff.c.orig	2014-08-17 00:33:23.000000000 +0400
+++ GraphicsMagick-1.3.20/coders/tiff.c	2014-12-22 16:01:12.984095307 +0300
@@ -1845,6 +1845,10 @@
               }
             else if (TIFFIsTiled(tiff))
               method=TiledMethod;
+#if defined(COMPRESSION_JBIG)
+            else if (compress_tag == COMPRESSION_JBIG)
+              method=StrippedMethod;
+#endif
             else if ((TIFFStripSize(tiff)) <= (1024*64))
               method=StrippedMethod;
             if (photometric == PHOTOMETRIC_MINISWHITE)

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