53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/*
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* algua beep module
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*
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* il faut etre honnete, mais ce module m'interpelle, parce
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* ce que je ne comprend plus l'intention premiere.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "funcs.h"
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/* --------------------------------------------------------------------- */
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/*
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* calculs sur une zone de l'image
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* valeur retournee entre 0 et 255
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*/
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double niveau_zone(unsigned char *datas, int w, int h, Rect *rp)
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{
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unsigned char *bptr;
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int niveau = 0;
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int lig, col;
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int l2, c2, off;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %d %d %p )\n", __func__, datas, w, h, rp);
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fprintf(stderr, " > x %d y %d w %d h %d\n", rp->x, rp->y, rp->w, rp->h);
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#endif
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l2 = (rp->y+rp->h);
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c2 = (rp->x+rp->w);
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for (lig=rp->y; lig<l2; lig++) {
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off = (3*w*lig) + (3*rp->x); /* WTF ? */
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bptr = datas + off;
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for (col=rp->x; col<c2; col++) {
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niveau += *(bptr+2); /* add value to sum */
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bptr += 3; /* next pixel */
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}
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}
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return (double)niveau / (double)(rp->w * rp->h);
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}
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/* --------------------------------------------------------------------- */
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