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$NetBSD: patch-ag,v 1.10 2005/09/20 05:04:11 schmonz Exp $
--- converter/other/pnmtopng.c.orig 2005-08-06 13:26:55.000000000 -0400
+++ converter/other/pnmtopng.c
@@ -1690,7 +1690,7 @@ writeRaster(png_struct * const p
pnm_promoteformatrow(xelrow, cols, maxval, format, maxval,
PPM_TYPE);
- makePngLine(line, xelrow, cols, maxval, alpha, alpha_mask[row],
+ makePngLine(line, xelrow, cols, maxval, alpha, alpha ? alpha_mask[row] : NULL,
cht, caht, info_ptr, png_maxval, depth);
png_write_row(png_ptr, line);
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