89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/*
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* gui_util.c - GUI helper functions
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*
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* Written 2010 by Werner Almesberger
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* Copyright 2010 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <math.h>
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#include <assert.h>
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#include <gtk/gtk.h>
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#include "gui_util.h"
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void hpoint(guchar *rgbbuf, int x, int y, int sx, uint8_t c[3])
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{
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guchar *p = rgbbuf+(y*sx+x)*3;
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p[0] = c[0];
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p[1] = c[1];
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p[2] = c[2];
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}
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void vpoint(guchar *rgbbuf, int y, int x, int sx, uint8_t c[3])
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{
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guchar *p = rgbbuf+(y*sx+x)*3;
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p[0] = c[0];
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p[1] = c[1];
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p[2] = c[2];
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}
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static void alpha(guchar *rgbbuf, int f, int i, int sx, uint8_t c[3], double w,
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void (*point)(guchar *rgbbuf, int f, int i, int sx, uint8_t c[3]))
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{
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uint8_t ct[3];
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int n;
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assert(w >= 0);
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assert(w <= 1);
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for (n = 0; n != 3; n++)
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ct[n] = round(c[n]*w);
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point(rgbbuf, f, i, sx, ct);
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}
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void aa_line(guchar *rgbbuf, int i, double fa, double fb, int max, int sx,
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uint8_t c[3],
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void (*point)(guchar *rgbbuf, int f, int i, int sx, uint8_t c[3]))
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{
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int f0, f1;
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int from, to, n;
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assert(max > 0);
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assert(fb >= fa);
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f0 = floor(fa);
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f1 = ceil(fb);
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if (f0 > max || f1 < 0)
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return;
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if (f0 == f1) {
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if (f0 >= 0 && f1 <= max)
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point(rgbbuf, f0, i, sx, c);
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return;
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}
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if (f0 >= 0)
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alpha(rgbbuf, f0, i, sx, c, 1-(fa-f0), point);
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if (f1 <= max)
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alpha(rgbbuf, f1, i, sx, c, 1-(f1-fb), point);
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from = f0+1 > 0 ? f0+1 : 0;
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to = f1-1 < max ? f1-1: max;
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for (n = from; n <= to; n++)
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point(rgbbuf, n, i, sx, c);
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}
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void draw_circle(GdkDrawable *da, GdkGC *gc, int x, int y, int r)
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{
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gdk_draw_arc(da, gc, FALSE, x-r, y-r, 2*r, 2*r, 0, 360*64);
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}
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