From ee154f16bd09a43359967f7e7b86c3677c09461d Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ghostscript.com>
Date: Wed, 30 Mar 2005 08:30:22 +0200
Subject: rename part 1 -- files
---
stream/filt_faxc.h | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 125 insertions(+)
create mode 100644 stream/filt_faxc.h
(limited to 'stream/filt_faxc.h')
diff --git a/stream/filt_faxc.h b/stream/filt_faxc.h
new file mode 100644
index 00000000..14cae13f
--- /dev/null
+++ b/stream/filt_faxc.h
@@ -0,0 +1,125 @@
+/* common bit magic */
+
+static inline void
+printbits(FILE *f, int code, int nbits)
+{
+ int n, b;
+ for (n = nbits - 1; n >= 0; n--)
+ {
+ b = (code >> n) & 1;
+ fprintf(f, "%c", b ? '1' : '0');
+ }
+}
+
+static inline int
+getbit(const unsigned char *buf, int x)
+{
+ return ( buf[x >> 3] >> ( 7 - (x & 7) ) ) & 1;
+}
+
+static inline void
+printline(FILE *f, unsigned char *line, int w)
+{
+ int i;
+ for (i = 0; i < w; i++)
+ fprintf(f, "%c", getbit(line, i) ? '#' : '.');
+ fprintf(f, "\n");
+}
+
+static inline int
+getrun(const unsigned char *line, int x, int w, int c)
+{
+ int z;
+ int b;
+
+ if (x < 0)
+ x = 0;
+
+ z = x;
+ while (z < w)
+ {
+ b = getbit(line, z);
+ if (c != b)
+ break;
+ z ++;
+ }
+
+ return z - x;
+}
+
+static inline int
+findchanging(const unsigned char *line, int x, int w)
+{
+ int a, b;
+
+ if (line == 0)
+ return w;
+
+ if (x == -1)
+ {
+ a = 0;
+ x = 0;
+ }
+ else
+ {
+ a = getbit(line, x);
+ x++;
+ }
+
+ while (x < w)
+ {
+ b = getbit(line, x);
+ if (a != b)
+ break;
+ x++;
+ }
+
+ return x;
+}
+
+static inline int
+findchangingcolor(const unsigned char *line, int x, int w, int color)
+{
+ if (line == 0)
+ return w;
+
+ x = findchanging(line, x, w);
+
+ if (x < w && getbit(line, x) != color)
+ x = findchanging(line, x, w);
+
+ return x;
+}
+
+static const unsigned char lm[8] =
+ { 0xFF, 0x7F, 0x3F, 0x1F, 0x0F, 0x07, 0x03, 0x01 };
+
+static const unsigned char rm[8] =
+ { 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE };
+
+static inline void
+setbits(unsigned char *line, int x0, int x1)
+{
+ int a0, a1, b0, b1, a;
+
+ a0 = x0 >> 3;
+ a1 = x1 >> 3;
+
+ b0 = x0 & 7;
+ b1 = x1 & 7;
+
+ if (a0 == a1)
+ {
+ if (b1)
+ line[a0] |= lm[b0] & rm[b1];
+ }
+ else
+ {
+ line[a0] |= lm[b0];
+ for (a = a0 + 1; a < a1; a++)
+ line[a] = 0xFF;
+ if (b1)
+ line[a1] |= rm[b1];
+ }
+}
+
--
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