150 lines
3.1 KiB
C
150 lines
3.1 KiB
C
/*
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* DECOMPOSITION RGB
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include "../floatimg.h"
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extern int verbosity;
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/* == ---------------------------------------------------- == */
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/* some dirty macros */
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#define pixidx(fi,x,y) (((y)*fi->width)+(x))
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#define getRpix(fi,x,y) (fi->R[ pixidx(fi,(x),(y)) ])
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#define getGpix(fi,x,y) (fi->G[ pixidx(fi,(x),(y)) ])
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#define getBpix(fi,x,y) (fi->B[ pixidx(fi,(x),(y)) ])
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/* A lot of strange and usefull parenthesis */
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/* == ---------------------------------------------------- == */
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static float compute_z_value(float r, float g, float b)
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{
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double dval;
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return 42.0;
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}
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/* == ---------------------------------------------------- == */
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int fimg_decomp_rgbz_color(FloatImg *psrc, FloatImg *pdst, int k)
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{
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int x, y, x2, y2;
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int w2, h2, idx;
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float cumul, vgray;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__,
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psrc, pdst, k);
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#endif
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fimg_clear(pdst);
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w2 = psrc->width/2; h2 = psrc->height/2;
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for (y=0; y<h2; y++)
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{
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y2 = y * 2;
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for (x=0; x<w2; x++) {
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x2 = x * 2;
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cumul = getRpix(psrc, x2, y2) +
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getRpix(psrc, x2, y2+1) +
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getRpix(psrc, x2+1, y2) +
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getRpix(psrc, x2+1, y2+1);
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cumul /= 4, vgray = cumul;
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pdst->R[pixidx(pdst,x,y)] = cumul;
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pdst->R[pixidx(pdst,x+w2,y+h2)] = cumul;
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cumul = getGpix(psrc, x2, y2) +
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getGpix(psrc, x2, y2+1) +
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getGpix(psrc, x2+1, y2) +
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getGpix(psrc, x2+1, y2+1);
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cumul /= 4, vgray += cumul;
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pdst->G[pixidx(pdst,x+w2,y)] = cumul;
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pdst->G[pixidx(pdst,x+w2,y+h2)] = cumul;
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cumul = getBpix(psrc, x2, y2) +
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getBpix(psrc, x2, y2+1) +
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getBpix(psrc, x2+1, y2) +
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getBpix(psrc, x2+1, y2+1);
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cumul /= 4, vgray += cumul;
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pdst->B[pixidx(pdst,x,y+h2)] = cumul;
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pdst->B[pixidx(pdst,x+w2,y+h2)] = cumul;
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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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/* PUTAIN LE COPIER/COLLÉ DE BATARD !!! */
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int fimg_decomp_rgbz_gray(FloatImg *psrc, FloatImg *pdst, int k)
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{
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int x, y, x2, y2;
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int w2, h2, idx;
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float cumul, vgray;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__,
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psrc, pdst, k);
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#endif
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fimg_clear(pdst);
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w2 = psrc->width/2; h2 = psrc->height/2;
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for (y=0; y<h2; y++)
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{
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y2 = y * 2;
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for (x=0; x<w2; x++) {
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x2 = x * 2;
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cumul = getRpix(psrc, x2, y2) +
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getRpix(psrc, x2, y2+1) +
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getRpix(psrc, x2+1, y2) +
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getRpix(psrc, x2+1, y2+1);
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cumul /= 4, vgray = cumul;
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idx = pixidx(pdst,x,y);
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pdst->R[idx] = pdst->G[idx] = pdst->B[idx] = cumul;
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cumul = getGpix(psrc, x2, y2) +
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getGpix(psrc, x2, y2+1) +
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getGpix(psrc, x2+1, y2) +
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getGpix(psrc, x2+1, y2+1);
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cumul /= 4, vgray += cumul;
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idx = pixidx(pdst,x+w2,y);
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pdst->R[idx] = pdst->G[idx] = pdst->B[idx] = cumul;
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cumul = getBpix(psrc, x2, y2) +
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getBpix(psrc, x2, y2+1) +
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getBpix(psrc, x2+1, y2) +
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getBpix(psrc, x2+1, y2+1);
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cumul /= 4, vgray += cumul;
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idx = pixidx(pdst,x,y+h2);
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pdst->R[idx] = pdst->G[idx] = pdst->B[idx] = cumul;
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idx = pixidx(pdst,x+w2,y+h2);
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pdst->R[idx] = pdst->G[idx] = \
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pdst->B[idx] = vgray / 3.0;
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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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