300 lines
6.3 KiB
C
300 lines
6.3 KiB
C
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/*
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dither.c 31 Aout 1999
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-------- ------------
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "tthimage.h"
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/*::------------------------------------------------------------------::*/
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/*
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en entree, on doit avoir une image RGB, sinon, "segfault"
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le parametre 'uh' represente l'intensite de la couleur 'on'
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*/
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int
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Image_dither_Bayer_0(Image_Desc *s, Image_Desc *d, int uh)
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{
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int dx, dy, x, y, r, g, b;
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/* directement copie de la page 389 de "Bitmapped graphics" de
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Steve Rimmer. */
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static char pattern[8][8] =
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{
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{ 0, 32, 8, 40, 2, 34, 10, 42 },
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{ 48, 16, 56, 24, 50, 18, 58, 26 },
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{ 12, 44, 4, 36, 14, 46, 6, 38 },
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{ 60, 28, 52, 20, 62, 30, 54, 22 },
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{ 3, 35, 11, 43, 1, 33, 9, 41 },
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{ 51, 19, 59, 27, 49, 17, 57, 25 },
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{ 15, 47, 7, 39, 13, 45, 5, 37 },
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{ 63, 31, 55, 23, 61, 29, 53, 21 }
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};
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dx = s->width; dy = s->height;
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for (y=0; y<dy; y++)
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{
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for (x=0; x<dx; x++)
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{
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r = s->Rpix[y][x];
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if ((r>>2) > pattern[x&7][y&7]) d->Rpix[y][x] = uh;
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else d->Rpix[y][x] = 0;
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g = s->Gpix[y][x];
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if ((g>>2) > pattern[x&7][y&7]) d->Gpix[y][x] = uh;
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else d->Gpix[y][x] = 0;
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b = s->Bpix[y][x];
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if ((b>>2) > pattern[x&7][y&7]) d->Bpix[y][x] = uh;
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else d->Bpix[y][x] = 0;
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}
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}
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return OLL_KORRECT;
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}
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/*::------------------------------------------------------------------::*/
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/*
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* 19 Juin 2000: dithering on a 2x2 matrice.
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* 15 Nov 2001: 'uh' parameter is _now_ working ;-}
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*/
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int
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Image_dither_crude(Image_Desc *s, Image_Desc *d, int uh)
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{
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int x, y, r, g, b;
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int som;
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Image_clear(d, 0, 0, 0);
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for (x=0; x<(s->width-1); x+=2)
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{
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for (y=0; y<(s->height-1); y+=2)
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{
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r = g = b = 0;
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r += Image_R_pixel(s, x, y);
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r += Image_R_pixel(s, x+1, y);
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r += Image_R_pixel(s, x, y+1);
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r += Image_R_pixel(s, x+1, y+1);
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g += Image_G_pixel(s, x, y);
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g += Image_G_pixel(s, x+1, y);
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g += Image_G_pixel(s, x, y+1);
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g += Image_G_pixel(s, x+1, y+1);
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b += Image_B_pixel(s, x, y);
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b += Image_B_pixel(s, x+1, y);
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b += Image_B_pixel(s, x, y+1);
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b += Image_B_pixel(s, x+1, y+1);
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if (r < 512) Image_plotRGB(d, x, y, 0, 0, 0);
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else Image_plotRGB(d, x, y, uh, 0, 0);
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if (g < 512) Image_plotRGB(d, x+1, y, 0, 0, 0);
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else Image_plotRGB(d, x+1, y, 0, uh, 0);
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if (b < 512) Image_plotRGB(d, x, y+1, 0, 0, 0);
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else Image_plotRGB(d, x, y+1, 0, 0, uh);
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som = r + g + b;
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if (som < 2048)
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{
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Image_plotRGB(d, x+1, y+1, 0, 0, 0);
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}
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else
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{
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Image_plotRGB(d, x+1, y+1, uh, uh, uh);
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}
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}
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}
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return OLL_KORRECT;
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}
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/*::------------------------------------------------------------------::*/
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/*
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* <EFBFBD>a ne marche pas tr<EFBFBD>s fort, ce truc...
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*/
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int
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Image_dither_2x2(Image_Desc *s, Image_Desc *d, int uh)
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{
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int x, y, xm, ym;
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int r, g, b, v;
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x = s->width; xm = (x&1) ? (x-1) : x;
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y = s->height; ym = (y&1) ? (y-1) : y;
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Image_clear(d, 0, 0, 0);
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#if DEBUG_LEVEL
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fprintf(stderr, "dither 2x2: %d %d %d %d\n", x, xm, y, ym);
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#endif
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for (x=0; x<xm; x+=2)
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{
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for (y=0; y<ym; y+=2)
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{
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/*
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* bon sang, mais que faire ici ?
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*/
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r = s->Rpix[y][x];
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if (r > 127) Image_plotRGB(d, x, y, uh, 0, 0);
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else Image_plotRGB(d, x, y, 0, 0, 0);
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g = s->Gpix[y][x];
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if (g > 127) Image_plotRGB(d, x+1, y, 0, uh, 0);
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else Image_plotRGB(d, x+1, y, 0, 0, 0);
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b = s->Bpix[y][x];
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if (b > 127) Image_plotRGB(d, x, y+1, 0, 0, uh);
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else Image_plotRGB(d, x, y+1, 0, 0, 0);
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v = 0xf0 & ((r+g+b)/3);
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Image_plotRGB(d, x+1, y+1, v, v, v);
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}
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}
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return FUNC_IS_ALPHA;
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}
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/*::------------------------------------------------------------------::*/
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int
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Image_dither_seuil_random(Image_Desc *s, Image_Desc *d, int uh)
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{
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int x, y, r, g, b;
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int foo;
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if ( (foo=Image_compare_desc(s, d)) )
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{
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fprintf(stderr, "dither seuil random: images are differents %d\n", foo);
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return foo;
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}
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Image_clear(d, 0, 0, 0);
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for (y=0; y<s->height; y++)
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{
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for (x=0; x<s->width; x++)
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{
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if (s->Rpix[y][x] < rand() % 256) r = 0;
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else r = uh;
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if (Image_G_pixel(s, x, y) < rand() % 256) g = 0;
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else g = uh;
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if (Image_B_pixel(s, x, y) < rand() % 256) b = 0;
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else b = uh;
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(d->Rpix[y])[x] = r;
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(d->Gpix[y])[x] = g;
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(d->Bpix[y])[x] = b;
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}
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}
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return OLL_KORRECT;
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}
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/*::------------------------------------------------------------------::*/
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/*
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* algo tire de Interactive Computer Graphics p. 135
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*
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* subtle bug: uh _must_ be 255 ?
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*/
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int
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Image_dither_simple_error(Image_Desc *s, Image_Desc *d, int uh)
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{
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int x, y, xa, xb, inc, errR, errG, errB;
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int r, g, b, dr, dg, db;
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int foo;
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if ( (foo=Image_compare_desc(s, d)) )
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{
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fprintf(stderr, "dither simple error: images are differents %d\n", foo);
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return foo;
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}
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Image_clear(d, 0, 0, 0);
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errR = errG = errB = 0;
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for (y=0; y<s->height; y++)
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{
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if (y & 1)
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{
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xa = 0; xb = s->width - 1; inc = 1;
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}
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else
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{
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xa = s->width - 1; xb = 0; inc = -1;
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}
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for (x=xa; x!=xb; x+=inc)
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{
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r = (s->Rpix[y])[x];
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if ( (r + errR) > 127 ) dr = uh;
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else dr = 0;
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errR = (r + errR) - dr;
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g = (s->Gpix[y])[x];
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if ( (g + errG) > 127 ) dg = uh;
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else dg = 0;
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errG = (g + errG) - dg;
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b = (s->Bpix[y])[x];
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if ( (b + errB) > 127 ) db = uh;
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else db = 0;
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errB = (b + errB) - db;
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(d->Rpix[y])[x] = dr;
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(d->Gpix[y])[x] = dg;
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(d->Bpix[y])[x] = db;
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}
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}
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return OLL_KORRECT;
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}
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/*::------------------------------------------------------------------::*/
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/*
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* parameters 'sa' and 'sb' must be carefully tuned.
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* 29 Jan 2002: may be I can buid a func for automagically
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* computing of right values ?
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*/
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int
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Image_dither_double_seuil(Image_Desc *s, Image_Desc *d, int sa, int sb, int uh)
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{
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int x, y, r, g, b, foo;
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if ( (foo=Image_compare_desc(s, d)) )
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{
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fprintf(stderr, "dither double seuil: images are differents %d\n", foo);
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return foo;
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}
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if ( sa >= sb )
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{
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fprintf(stderr, "dither double seuil: lo %d > hi %d !\n", sa, sb);
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}
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for (y=0; y<s->height; y++)
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{
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for (x=0; x<s->width; x++)
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{
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r = (s->Rpix[y])[x];
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if (r < sa) r = 0;
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else if (r > sb) r = uh;
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else r = (x&1 && y&1) ? 0 : uh;
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g = (s->Gpix[y])[x];
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if (g < sa) g = 0;
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else if (g > sb) g = uh;
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else g = (!(x&1) && y&1) ? 0 : uh;
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b = (s->Bpix[y])[x];
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if (b < sa) b = 0;
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else if (b > sb) b = uh;
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else b = (x&1 && !(y&1)) ? 0 : uh;
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(d->Rpix[y])[x] = r;
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(d->Gpix[y])[x] = g;
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(d->Bpix[y])[x] = b;
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}
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}
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return OLL_KORRECT;
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}
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/*::------------------------------------------------------------------::*/
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