120 lines
2.1 KiB
C
120 lines
2.1 KiB
C
/*
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calcluts.c
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----------
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voir aussi: luts15bits.c
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef NEED_ALLOCA_H
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#include <alloca.h>
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#endif
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#include "tthimage.h"
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/*::------------------------------------------------------------------::*/
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int
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Image_calclut_lin(int *lut, int v0, int v255)
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{
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int foo, quux, delta;
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#if DEBUG_LEVEL
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fprintf(stderr, "calclut lin: v0 = %d v255 = %d\n", v0, v255);
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#endif
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delta = v255 - v0;
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if (delta == 0)
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{
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return DIVISOR_IS_0;
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}
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#if DEBUG_LEVEL
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fprintf(stderr, "calclut lin: delta = %d\n", delta);
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#endif
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for (foo=0; foo<256; foo++)
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{
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quux = (foo * delta / 255) + v0;
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#if DEBUG_LEVEL
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printf("lut(%d) = %d\n", foo, quux);
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#endif
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lut[foo] = quux;
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}
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return FUNC_IS_ALPHA;
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}
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/*::------------------------------------------------------------------::*/
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int
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Image_calclut_foo(int *lut, int v0, int v255)
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{
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fprintf(stderr, "%s ( %p %d %d )\n", __func__, lut, v0, v255);
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return FUNC_IS_ALPHA;
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}
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/*::------------------------------------------------------------------::*/
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int
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Image_print_lut(int *lut, char *fname, int flag)
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{
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FILE *fp;
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int foo;
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if (strcmp(fname, "-"))
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fp = fopen(fname, "w");
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else
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fp = stdout;
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for (foo=0; foo<256; foo++)
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{
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if (flag)
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printf("%d ", foo);
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printf("%d\n", lut[foo]);
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}
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if (fp!=stdout)
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fclose(fp);
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return FUNC_IS_ALPHA;
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}
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/*::------------------------------------------------------------------::*/
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int
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Image_load_lut(int *lut, char *fname, int flag)
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{
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FILE *fp;
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int value, foo, idx;
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if (flag) {
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fprintf(stderr, "in %s, flag must be O, was %d\n", __func__, flag);
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return WRONG_FLAG;
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}
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#if DEBUG_LEVEL
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fprintf(stderr, "load_lut %s in %p\n", fname, lut);
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#endif
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if (NULL==(fp=fopen(fname, "r")))
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{
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fprintf(stderr, "%s can't fopen %s\n", __func__, fname);
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return 666;
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}
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/* WARNING : very crude code here (4 nov 1999) */
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for (idx=0; idx<256; idx++)
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{
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foo = fscanf(fp, "%d", &value);
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#if DEBUG_LEVEL
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fprintf(stderr, "load lut %3d %3d %d\n", idx, foo, value);
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#endif
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if (1==foo) lut[idx] = value;
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else lut[idx] = -1;
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}
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fclose(fp);
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return FUNC_IS_ALPHA;
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}
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/*::------------------------------------------------------------------::*/
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