166 lines
3.6 KiB
C
166 lines
3.6 KiB
C
/*
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* glitches.c
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* ----------
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*
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* initially developped for the interpolator
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include "../floatimg.h"
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#include "glitches.h"
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extern int verbosity;
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/* -------------------------------------------------------------- */
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int kill_a_random_line(FloatImg *pvictime, float fval, int bits)
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{
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int line, xpos, offset;
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float ftmp;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pvictime, bits);
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#endif
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line = rand() % pvictime->height;
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if (verbosity > 1) {
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fprintf(stderr, "%s: try to kill line %d\n", __func__, line);
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}
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offset = pvictime->width * line;
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for (xpos=0; xpos<pvictime->width; xpos++) {
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if (bits & 1) { ftmp = pvictime->R[offset+xpos] * fval;
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pvictime->R[offset+xpos] = sqrt(ftmp); }
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else pvictime->R[offset+xpos] = 0.0;
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if (bits & 2) { ftmp = pvictime->G[offset+xpos] * fval;
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pvictime->G[offset+xpos] = sqrt(ftmp); }
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else pvictime->G[offset+xpos] = 0.0;
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if (bits & 4) { ftmp = pvictime->B[offset+xpos] * fval;
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pvictime->B[offset+xpos] = sqrt(ftmp); }
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else pvictime->B[offset+xpos] = 0.0;
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}
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return 0;
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}
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/* -------------------------------------------------------------- */
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int kill_a_few_lines(FloatImg *who, float fval, int number)
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{
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int idx, foo;
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/* Frag the pixels */
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for (idx=0; idx<number; idx++) {
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foo = kill_a_random_line(who, fval, rand() & 0x0f);
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if (foo) abort();
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}
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return foo;
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}
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/* -------------------------------------------------------------- */
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int un_petit_flou_8x8(FloatImg *picture, int xpos, int ypos)
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{
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float sr, sg, sb;
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int x, y, off;
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/*
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* please add boundary check ?
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*/
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sr = sg = sb = 0.0;
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for (y=0; y<8; y++) {
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off = xpos + (picture->width * (y+ypos));
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for (x=0; x<8; x++) {
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sr += picture->R[off];
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sg += picture->G[off];
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sb += picture->B[off];
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off++;
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}
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}
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sr /= 64.0; sg /= 64.0; sb /= 64.0;
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for (y=0; y<8; y++) {
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off = xpos + (picture->width * (y+ypos));
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for (x=0; x<8; x++) {
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picture->R[off] = sr;
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picture->G[off] = sg;
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picture->B[off] = sb;
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off++;
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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 un_moyen_flou_8x8(FloatImg *picture, int xpos, int ypos)
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{
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int i, j, x, y;
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/*
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* please add boundary check ?
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*/
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for (i=y=0; i<8; i++, y+=8) {
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for (j=x=0; j<8; j++, x+=8 ) {
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un_petit_flou_8x8(picture, x+xpos, y+ypos);
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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 poke_a_random_pixel(FloatImg *picz, float fval, int kaboo)
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{
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return -1;
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}
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/* -------------------------------------------------------------- */
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/*
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* used by vertical_singlitch()
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*/
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int x_delta(float dy, float phy)
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{
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float param, fv;
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param = dy + phy;
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fv = 9.999*sin(param) + 6.666*sin(param*3) + 3.333*sin(param*5);
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return (int)fv;
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}
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/* -------------------------------------------------------------- */
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/*
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* please explain arguments
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*/
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int vertical_singlitch(FloatImg *picz, int xpos, float fval,
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float omega, float phi)
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{
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int y, x, w, h;
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float dy;
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float fv;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %d %f %f )\n", __func__, picz,
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xpos, omega, phi);
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#endif
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h = picz->height; w = picz->width;
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#define BB 4
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for (y=BB; y<h-BB; y++) {
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dy = (float)y * omega; /* normalize vertical position */
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x = xpos + x_delta(dy, phi); /* add sinus deviation */
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/* compute bounding box */
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if ( (x>BB) && (x<w-BB) ) {
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/* an make the glitch */
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fimg_plot_rgb(picz, x, y, fval, fval, fval);
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fv = fval / 3.0;
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if (rand() & 8)
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fimg_plot_rgb(picz, x-1, y, fv, fv, fv);
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if (rand() & 8)
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// XXX else
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fimg_plot_rgb(picz, x+1, y, fv, fv, fv);
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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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