Import sources from 2011-03-30 iso image

1 files changed, 69 insertions, 0 deletions

diff --git a/sys/src/cmd/postscript/postmd/postmd.h b/sys/src/cmd/postscript/postmd/postmd.h
new file mode 100755
index 000000000..715596a1f
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+++ b/sys/src/cmd/postscript/postmd/postmd.h
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+/*
+ *
+ * An interval list used to map matrix elements into integers in the range 0 to
+ * 254 representing shades of gray on a PostScript printer. The list can be given
+ * using the -i option or can be set in the optional header that can preceed each
+ * matrix. The list should be a comma or space separated list that looks like,
+ *
+ *		num1,num2, ... ,numn
+ *
+ * where each num is a floating point number. The list must be given in increasing
+ * numerical order. The n numbers in the list partion the real line into 2n+1
+ * regions given by,
+ *
+ *		region1		element < num1
+ *		region2		element = num1
+ *		region3		element < num2
+ *		region4		element = num3
+ *		   .		     .
+ *		   .		     .
+ *		   .		     .
+ *		region2n	element = numn
+ *		region2n+1	element > numn
+ *
+ * Every number in a given region is mapped into an integer in the range 0 to 254
+ * and that number, when displayed on a PostScript printer using the image operator,
+ * prints as a square filled with a gray scale that reflects the integer that was
+ * chosen. 0 maps to black and 255 white (that's why 255 is normally omitted).
+ *
+ * The shades of gray chosen by the program are normally generated automatically,
+ * but can be reassigned using the -g option or by including a grayscale line in
+ * the optional header. The grayscale list is comma or space separated list of
+ * integers between 0 and 255 that's used to map individual regions into arbitray
+ * shade of gray, thus overriding the default choice made in the program. The list
+ * should look like,
+ *
+ *		color1,color2, ... ,color2n+1
+ *
+ * where color1 applies to region1 and color2n+1 applies to region2n+1. If less
+ * than 2n+1 numbers are given the default assignments will be used for the missing
+ * regions. Each color must be an integer in the range 0 to 255.
+ *
+ * The default interval list is given below. The default grayscale maps 254 (almost
+ * white) into the first region and 0 (black) into the last.
+ *
+ */
+
+#define DFLTILIST	"-1,0,1"
+
+/*
+ *
+ * The active interval list is built from an interval string and stored in an array
+ * whose elements are of type Ilist.
+ *
+ */
+
+typedef struct  {
+	double	val;			/* only valid in kind is ENDPOINT */
+	int	color;			/* gray scale color */
+	long	count;			/* statistics for each region */
+} Ilist;
+
+/*
+ *
+ * Non-integer function declarations.
+ *
+ */
+
+char	*savestring();
+