101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
/*
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* Modeles Numeriques de Terrain
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*
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*/
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#include <stdio.h>
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#include <math.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "../floatimg.h"
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int verbosity;
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/* ------------------------------------------------------------------- */
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/*
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* First try
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*/
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int brotche_mnt_style(FloatImg *src, FloatImg *dst)
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{
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int x, y;
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int offset;
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float z1, z2, z3, z4;
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float a, b, c;
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float pente;
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fprintf(stderr, ">>> %s ( %p %p )\n", __func__, src, dst);
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#define W (src->width)
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#define DX 1.0
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#define DY 1.0
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for (y=0; y<(src->height-1); y++) {
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for (x=0; x<(src->width-1); x++) {
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offset = (y * src->width) + x;
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z1 = src->R[offset];
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z2 = src->R[offset+1];
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z3 = src->R[offset+W];
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z4 = src->R[offset+W+1];
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a = ( z1 + z2 + z3 + z4) / 4.0;
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b = (-z1 + z2 - z3 + z4) / 2.0 / DX;
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c = (-z1 - z2 + z3 + z4) / 2.0 / DY;
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pente = atanf(sqrt(b*b + c*c));
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dst->R[offset] = 0;
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if (pente < 0.0) dst->G[offset] = pente;
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else dst->B[offset] = pente;
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}
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}
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return 0;
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}
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/* ------------------------------------------------------------------- */
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int main(int argc, char *argv[])
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{
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FloatImg src, dst;
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char *infile, *outfile;
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int foo;
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if (3 != argc) {
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fprintf(stderr, "%s need 2 args : infile & outfile\n", argv[0]);
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fimg_print_version(0);
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exit(1);
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}
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infile = argv[1]; outfile = argv[2];
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fprintf(stderr,"--- working on %s\n", infile);
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foo = fimg_create_from_dump(infile, &src);
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if (foo) {
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fprintf(stderr, "err %d loading image '%s'\n", foo, infile);
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exit(1);
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}
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foo = fimg_clone(&src, &dst, 0);
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if (foo) {
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fprintf(stderr, "err %d cloning image\n", foo);
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exit(1);
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}
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foo = brotche_mnt_style(&src, &dst);
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if (foo) {
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fprintf(stderr, "something weird happen %d\n", foo);
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exit(1);
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}
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foo = fimg_export_picture(&dst, outfile, 0);
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if (foo) {
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fprintf(stderr, "err %d exporting to %s\n", foo, outfile);
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exit(1);
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}
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return 0;
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}
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/* ------------------------------------------------------------------- */
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