pmc/sdl.cc
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sat, 13 Dec 2008 17:57:59 +0100
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permissions -rw-r--r--
libtest demonstrates how to use shared libraries committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/***
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 * $Id: sdl.cc,v 1.1.1.1 2008-04-28 17:33:22 mbroeker Exp $
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 * $Source: /development/cpp/pmc/sdl.cc,v $
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 *
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 */
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#include <SDL/SDL.h>
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#define max(a,b) (((a) > (b)) ? (a) : (b))
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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#define abs(a) (((a)<0) ? -(a) : (a))
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#define sign(a) (((a)<0) ? -1 : (a)>0 ? 1 : 0)
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void drawLine (SDL_Surface * s, int x1, int y1, int x2, int y2, Uint32 color)
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{
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    int d;
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    int x;
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    int y;
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    int ax;
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    int ay;
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    int sx;
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    int sy;
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    int dx;
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    int dy;
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    Uint8 *lineAddr;
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    Sint32 yOffset;
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    dx = x2 - x1;
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    ax = abs (dx) << 1;
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    sx = sign (dx);
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    dy = y2 - y1;
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    ay = abs (dy) << 1;
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    sy = sign (dy);
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    yOffset = sy * s->pitch;
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    x = x1;
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    y = y1;
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    lineAddr = ((Uint8 *) s->pixels) + (y * s->pitch);
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    if (ax > ay) {              /* x dominant */
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        d = ay - (ax >> 1);
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        for (;;) {
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            *((Uint16 *) (lineAddr + (x << 1))) = (Uint16) color;
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            if (x == x2) {
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                return;
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            }
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            if (d >= 0) {
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                y += sy;
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                lineAddr += yOffset;
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                d -= ax;
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            }
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            x += sx;
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            d += ay;
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        }
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    } else {                    /* y dominant */
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        d = ax - (ay >> 1);
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        for (;;) {
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            *((Uint16 *) (lineAddr + (x << 1))) = (Uint16) color;
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            if (y == y2) {
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                return;
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            }
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            if (d >= 0) {
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                x += sx;
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                d -= ay;
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            }
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            y += sy;
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            lineAddr += yOffset;
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            d += ax;
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        }
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    }
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}