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	ldconvert.c - sam - An updated version of the sam text editor.
	git clone git://vernunftzentrum.de/sam.git
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	ldconvert.c (1569B)
	---
	1 /* Copyright (c) 1998 Lucent Technologies - All rights reserved. */
	2 #include <u.h>
	3 #include <libg.h>
	4 #include "libgint.h"
	5
	6 void
	7 _ldconvert(char in, int inld, char out, int outld, int w, int h)
	8 {
	9 int a, b, i, j, i1, j1, j2, mask;
	10 int ind, inl, outd, outl;
	11 int hh, ww;
	12 char p, q;
	13
	14 i1 = 8 >> inld;
	15 j1 = 8 >> outld;
	16 ind = 1 << inld;
	17 outd = 1 << outld;
	18 inl = ((w << inld) + 7)/8;
	19 outl = ((w << outld) + 7)/8;
	20 b = 0;
	21
	22 if (ind > outd) {
	23 mask = 256 - (256 >> outd);
	24 for (hh = 0; hh < h; hh++, in += inl, out += outl)
	25 for (p = in, q = out, ww = 0; ww < w; ww++) {
	26 for (j = j1; j > 0; ) {
	27 a = *p++;
	28 for (i = i1; i > 0; i--, j--) {
	29 b \|= a & mask;
	30 a <<= ind;
	31 b <<= outd;
	32 }
	33 }
	34 *q++ = (b >> 8);
	35 }
	36 } else {
	37 j2 = 1 << (outld - inld);
	38 mask = 256 - (256 >> ind);
	39 for (hh = 0; hh < h; hh++, in += inl, out += outl)
	40 for (p = in, q = out, ww = 0; ww < w; ww++) {
	41 a = *p++;
	42 for (i = i1; i > 0; ) {
	43 for (j = j1; j > 0; j--, i--) {
	44 b \|= a & mask;
	45 a <<= ind;
	46 b <<= outd;
	47 }
	48 for (j = j2; j > 0; j--)
	49 b \|= (b << ind);
	50 *q++ = (b >> 8);
	51 }
	52 }
	53 }
	54 }