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/* Copyright (c) 1997 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Routines for veiling glare and loss of acuity. |
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*/ |
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#define rdirscan(y) (raydir+(y)*fvxr) |
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static void compraydir(void); |
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#if ADJ_VEIL |
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static void smoothveil(void); |
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#endif |
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|
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compraydir() /* compute ray directions */ |
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|
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static void |
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compraydir(void) /* compute ray directions */ |
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{ |
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FVECT rorg, rdir; |
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double h, v; |
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register int x, y; |
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int x, y; |
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|
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if (raydir != NULL) /* already done? */ |
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return; |
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syserror("malloc"); |
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|
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for (y = 0; y < fvyr; y++) { |
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switch (inpres.or) { |
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switch (inpres.rt) { |
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case YMAJOR: case YMAJOR|XDECR: |
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v = (y+.5)/fvyr; break; |
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case YMAJOR|YDECR: case YMAJOR|YDECR|XDECR: |
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h = 1. - (y+.5)/fvyr; break; |
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} |
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for (x = 0; x < fvxr; x++) { |
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switch (inpres.or) { |
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switch (inpres.rt) { |
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case YMAJOR: case YMAJOR|YDECR: |
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h = (x+.5)/fvxr; break; |
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case YMAJOR|XDECR: case YMAJOR|XDECR|YDECR: |
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} |
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compveil() /* compute veiling image */ |
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void |
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compveil(void) /* compute veiling image */ |
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{ |
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double t2, t2sum; |
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COLOR ctmp, vsum; |
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int px, py; |
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register int x, y; |
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int x, y; |
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|
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if (veilimg != NULL) /* already done? */ |
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return; |
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t2sum += t2; |
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} |
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/* VADAPT of original is subtracted in addveil() */ |
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scalecolor(vsum, VADAPT/t2sum); |
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if (t2sum > FTINY) |
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scalecolor(vsum, VADAPT/t2sum); |
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copycolor(veilscan(py)[px], vsum); |
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} |
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/* modify FOV sample image */ |
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} |
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|
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addveil(sl, y) /* add veil to scanline */ |
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COLOR *sl; |
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int y; |
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#if ADJ_VEIL |
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/* |
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* The following veil adjustment was added to compensate for |
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* the fact that contrast reduction gets confused with veil |
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* in the human visual system. Therefore, we reduce the |
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* veil in portions of the image where our mapping has |
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* already reduced contrast below the target value. |
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* This gets called after the intial veil has been computed |
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* and added to the foveal image, and the mapping has been |
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* determined. |
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*/ |
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void |
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adjveil(void) /* adjust veil image */ |
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{ |
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float *crfptr = crfimg; |
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COLOR *fovptr = fovimg; |
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COLOR *veilptr = veilimg; |
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double s2nits = 1./inpexp; |
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double vl, vl2, fovl, vlsum; |
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double deltavc[3]; |
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int i, j; |
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|
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if (lumf == rgblum) |
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s2nits *= WHTEFFICACY; |
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|
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for (i = fvxr*fvyr; i--; crfptr++, fovptr++, veilptr++) { |
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if (crfptr[0] >= 0.95) |
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continue; |
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vl = plum(veilptr[0]); |
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fovl = (plum(fovptr[0]) - vl) * (1./(1.-VADAPT)); |
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if (vl <= 0.05*fovl) |
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continue; |
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vlsum = vl; |
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for (j = 2; j < 11; j++) { |
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vlsum += crfptr[0]*vl - (1.0 - crfptr[0])*fovl; |
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vl2 = vlsum / (double)j; |
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if (vl2 < 0.0) |
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vl2 = 0.0; |
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crfptr[0] = crfactor(fovl + vl2); |
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} |
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/* desaturation code causes color fringes at this level */ |
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for (j = 3; j--; ) { |
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double vc = colval(veilptr[0],j); |
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double fovc = (colval(fovptr[0],j) - vc) * |
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(1./(1.-VADAPT)); |
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deltavc[j] = (1.-crfptr[0])*(fovl/s2nits - fovc); |
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if (vc + deltavc[j] < 0.0) |
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break; |
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} |
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if (j < 0) |
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addcolor(veilptr[0], deltavc); |
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else |
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scalecolor(veilptr[0], vl2/vl); |
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} |
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smoothveil(); /* smooth our result */ |
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} |
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|
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|
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static void |
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smoothveil(void) /* smooth veil image */ |
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{ |
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COLOR *nveilimg; |
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COLOR *ovptr, *nvptr; |
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int x, y, i; |
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|
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nveilimg = (COLOR *)malloc(fvxr*fvyr*sizeof(COLOR)); |
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if (nveilimg == NULL) |
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return; |
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for (y = 1; y < fvyr-1; y++) { |
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ovptr = veilimg + y*fvxr + 1; |
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nvptr = nveilimg + y*fvxr + 1; |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./12.) * |
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(ovptr[-1][i] + ovptr[-fvxr][i] + |
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ovptr[1][i] + ovptr[fvxr][i]) |
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+ (1./24.) * |
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(ovptr[-fvxr-1][i] + ovptr[-fvxr+1][i] + |
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ovptr[fvxr-1][i] + ovptr[fvxr+1][i]); |
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} |
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ovptr = veilimg + 1; |
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nvptr = nveilimg + 1; |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./9.) * |
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(ovptr[-1][i] + ovptr[1][i] + ovptr[fvxr][i]) |
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+ (1./12.) * |
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(ovptr[fvxr-1][i] + ovptr[fvxr+1][i]); |
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ovptr = veilimg + (fvyr-1)*fvxr + 1; |
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nvptr = nveilimg + (fvyr-1)*fvxr + 1; |
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for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./9.) * |
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(ovptr[-1][i] + ovptr[1][i] + ovptr[-fvxr][i]) |
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+ (1./12.) * |
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(ovptr[-fvxr-1][i] + ovptr[-fvxr+1][i]); |
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ovptr = veilimg + fvxr; |
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nvptr = nveilimg + fvxr; |
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for (y = 1; y < fvyr-1; y++, ovptr += fvxr, nvptr += fvxr) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./9.) * |
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(ovptr[-fvxr][i] + ovptr[1][i] + ovptr[fvxr][i]) |
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+ (1./12.) * |
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(ovptr[-fvxr+1][i] + ovptr[fvxr+1][i]); |
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ovptr = veilimg + fvxr - 1; |
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nvptr = nveilimg + fvxr - 1; |
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for (y = 1; y < fvyr-1; y++, ovptr += fvxr, nvptr += fvxr) |
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for (i = 3; i--; ) |
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nvptr[0][i] = 0.5 * ovptr[0][i] |
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+ (1./9.) * |
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(ovptr[-fvxr][i] + ovptr[-1][i] + ovptr[fvxr][i]) |
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+ (1./12.) * |
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(ovptr[-fvxr-1][i] + ovptr[fvxr-1][i]); |
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for (i = 3; i--; ) { |
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nveilimg[0][i] = veilimg[0][i]; |
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nveilimg[fvxr-1][i] = veilimg[fvxr-1][i]; |
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nveilimg[(fvyr-1)*fvxr][i] = veilimg[(fvyr-1)*fvxr][i]; |
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nveilimg[fvyr*fvxr-1][i] = veilimg[fvyr*fvxr-1][i]; |
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} |
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free((void *)veilimg); |
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veilimg = nveilimg; |
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} |
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#endif |
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|
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void |
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addveil( /* add veil to scanline */ |
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COLOR *sl, |
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int y |
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) |
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{ |
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int vx, vy; |
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double dx, dy; |
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double lv, uv; |
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register int x, i; |
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int x, i; |
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vy = dy = (y+.5)/numscans(&inpres)*fvyr - .5; |
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while (vy >= fvyr-1) vy--; |
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SCANBAR *rootbar; /* root scan bar (lowest resolution) */ |
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|
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float *inpacuD; /* input acuity data (cycles/degree) */ |
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float *inpacuD = NULL; /* input acuity data (cycles/degree) */ |
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|
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#define tsampr(x,y) inpacuD[(y)*fvxr+(x)] |
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|
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static COLOR * getascan(SCANBAR *sb, int y); |
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static void acusample(COLOR col, int x, int y, double sr); |
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static void ascanval(COLOR col, int x, int y, SCANBAR *sb); |
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static SCANBAR *sballoc(int se, int ns, int sl); |
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|
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double |
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hacuity(La) /* return visual acuity in cycles/degree */ |
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double La; |
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hacuity( /* return visual acuity in cycles/degree */ |
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double La |
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) |
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{ |
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/* functional fit */ |
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return(17.25*atan(1.4*log10(La) + 0.35) + 25.72); |
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} |
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|
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COLOR * |
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getascan(sb, y) /* find/read scanline y for scanbar sb */ |
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register SCANBAR *sb; |
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int y; |
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static COLOR * |
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getascan( /* find/read scanline y for scanbar sb */ |
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SCANBAR *sb, |
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int y |
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) |
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{ |
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register COLOR *sl0, *sl1, *mysl; |
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register int i; |
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COLOR *sl0, *sl1, *mysl; |
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int i; |
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if (y < sb->nread - sb->nscans) /* too far back? */ |
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return(NULL); |
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} |
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|
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acuscan(scln, y) /* get acuity-sampled scanline */ |
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COLOR *scln; |
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int y; |
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void |
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acuscan( /* get acuity-sampled scanline */ |
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COLOR *scln, |
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int y |
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) |
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{ |
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double sr; |
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double dx, dy; |
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int ix, iy; |
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register int x; |
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> |
int x; |
367 |
> |
|
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if (inpacuD == NULL) |
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return; |
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/* compute foveal y position */ |
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iy = dy = (y+.5)/numscans(&inpres)*fvyr - .5; |
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while (iy >= fvyr-1) iy--; |
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} |
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|
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|
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acusample(col, x, y, sr) /* interpolate sample at (x,y) using rate sr */ |
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COLOR col; |
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int x, y; |
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double sr; |
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> |
static void |
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> |
acusample( /* interpolate sample at (x,y) using rate sr */ |
390 |
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COLOR col, |
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int x, |
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int y, |
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double sr |
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) |
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{ |
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COLOR c1; |
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double d; |
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register SCANBAR *sb0; |
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> |
SCANBAR *sb0; |
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|
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for (sb0 = rootbar; sb0->sampe != 0 && 1<<sb0[1].sampe > sr; sb0++) |
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; |
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} |
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|
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|
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ascanval(col, x, y, sb) /* interpolate scanbar at orig. coords (x,y) */ |
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COLOR col; |
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int x, y; |
416 |
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SCANBAR *sb; |
413 |
> |
static void |
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> |
ascanval( /* interpolate scanbar at orig. coords (x,y) */ |
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COLOR col, |
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int x, |
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int y, |
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SCANBAR *sb |
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) |
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{ |
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COLOR *sl0, *sl1, c1, c1y; |
422 |
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double dx, dy; |
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/* get scanlines */ |
438 |
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sl0 = getascan(sb, iy); |
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#ifdef DEBUG |
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< |
if (sl0 == NULL) { |
441 |
< |
fprintf(stderr, "%s: internal - cannot backspace in ascanval\n", |
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progname); |
291 |
< |
abort(); |
292 |
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} |
440 |
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if (sl0 == NULL) |
441 |
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error(INTERNAL, "cannot backspace in ascanval"); |
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#endif |
443 |
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sl1 = getascan(sb, iy+1); |
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/* 2D linear interpolation */ |
461 |
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} |
462 |
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|
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|
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< |
SCANBAR * |
465 |
< |
sballoc(se, ns, sl) /* allocate scanbar */ |
466 |
< |
int se; /* sampling rate exponent */ |
467 |
< |
int ns; /* number of scanlines */ |
468 |
< |
int sl; /* original scanline length */ |
464 |
> |
static SCANBAR * |
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sballoc( /* allocate scanbar */ |
466 |
> |
int se, /* sampling rate exponent */ |
467 |
> |
int ns, /* number of scanlines */ |
468 |
> |
int sl /* original scanline length */ |
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> |
) |
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{ |
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SCANBAR *sbarr; |
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< |
register SCANBAR *sb; |
472 |
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SCANBAR *sb; |
473 |
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|
474 |
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sbarr = sb = (SCANBAR *)malloc((se+1)*sizeof(SCANBAR)); |
475 |
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if (sb == NULL) |
476 |
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syserror("malloc"); |
477 |
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do { |
328 |
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sb->sampe = se; |
478 |
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sb->len = sl>>se; |
479 |
+ |
if (sb->len <= 0) |
480 |
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continue; |
481 |
+ |
sb->sampe = se; |
482 |
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sb->nscans = ns; |
483 |
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sb->sdata = (COLOR *)malloc(sb->len*ns*sizeof(COLOR)); |
484 |
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if (sb->sdata == NULL) |
491 |
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} |
492 |
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|
493 |
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|
494 |
< |
initacuity() /* initialize variable acuity sampling */ |
494 |
> |
void |
495 |
> |
initacuity(void) /* initialize variable acuity sampling */ |
496 |
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{ |
497 |
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FVECT diffx, diffy, cp; |
498 |
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double omega, maxsr; |
499 |
< |
register int x, y, i; |
500 |
< |
|
499 |
> |
int x, y, i; |
500 |
> |
|
501 |
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compraydir(); /* compute ray directions */ |
502 |
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|
503 |
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inpacuD = (float *)malloc(fvxr*fvyr*sizeof(float)); |