pmc/surface.cc
author Emilio Largo <largo@largo.homelinux.org>
Thu, 16 Apr 2009 12:49:12 +0200
changeset 44 bb6586b1c547
parent 42 83b8151b966d
child 46 4b9e1ac40246
permissions -rw-r--r--
md5.c renamed to md5rec.c committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * test/demos/pmc/surface.cc
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 * Copyright (C) 2008 Markus Broeker
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 */
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#include <surface.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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Surface::Surface (int w, int h, int d)
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{
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    width = w;
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    height = h;
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    depth = d;
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    SDL_Init (SDL_INIT_VIDEO);
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    screen = SDL_SetVideoMode (width, height, depth, SDL_HWSURFACE);
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    red = SDL_MapRGB (screen->format, 0xff, 0x00, 0x00);
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    black = SDL_MapRGB (screen->format, 0x00, 0x00, 0x00);
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    color = red;
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}
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Surface::~Surface ()
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{
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    SDL_Quit ();
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}
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void Surface::drawPixel (int x, int y)
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{
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    if (SDL_MUSTLOCK (screen)) {
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        if (SDL_LockSurface (screen) < 0) {
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            return;
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        }
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    }
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    switch (screen->format->BytesPerPixel) {
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    case 1:{                   /* vermutlich 8 Bit */
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            Uint8 *bufp;
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            bufp = (Uint8 *) screen->pixels + y * screen->pitch + x;
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            *bufp = color;
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        }
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        break;
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    case 2:{                   /* vermutlich 15 Bit oder 16 Bit */
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            Uint16 *bufp;
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            bufp = (Uint16 *) screen->pixels + y * screen->pitch / 2 + x;
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            *bufp = color;
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        }
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        break;
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    case 3:{                   /* langsamer 24-Bit-Modus, selten verwendet */
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            Uint8 *bufp;
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            bufp = (Uint8 *) screen->pixels + y * screen->pitch + x * 3;
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            if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {
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                bufp[0] = color;
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                bufp[1] = color >> 8;
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                bufp[2] = color >> 16;
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            } else {
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                bufp[2] = color;
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                bufp[1] = color >> 8;
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                bufp[0] = color >> 16;
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            }
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        }
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        break;
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    case 4:{                   /* vermutlich 32 Bit */
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            Uint32 *bufp;
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            bufp = (Uint32 *) screen->pixels + y * screen->pitch / 4 + x;
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            *bufp = color;
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        }
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        break;
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    }
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    if (SDL_MUSTLOCK (screen)) {
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        SDL_UnlockSurface (screen);
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    }
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}
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void Surface::drawLine (int x1, int y1, int x2, int y2)
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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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    /*
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     * SANITY CHECK: fix segfault in *((Uint16 *) (lineAddr + (x << 1))) = (Uint16) color;
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     */
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    if (y1 < 0 || y2 < 0)
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        return;
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    if (x1 < 0 || x2 < 0)
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        return;
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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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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   116
    ay = abs (dy) << 1;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   117
    sy = sign (dy);
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   118
    yOffset = sy * screen->pitch;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   119
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   120
    x = x1;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   121
    y = y1;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   122
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   123
    lineAddr = ((Uint8 *) screen->pixels) + (y * screen->pitch);
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   124
    if (ax > ay) {              /* x dominant */
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   125
        d = ay - (ax >> 1);
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   126
        for (;;) {
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   127
            *((Uint16 *) (lineAddr + (x << 1))) = (Uint16) color;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   128
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   129
            if (x == x2) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   130
                return;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   131
            }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   132
            if (d >= 0) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   133
                y += sy;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   134
                lineAddr += yOffset;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   135
                d -= ax;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   136
            }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   137
            x += sx;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   138
            d += ay;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   139
        }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   140
    } else {                    /* y dominant */
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   141
        d = ax - (ay >> 1);
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   142
        for (;;) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   143
            *((Uint16 *) (lineAddr + (x << 1))) = (Uint16) color;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   144
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   145
            if (y == y2) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   146
                return;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   147
            }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   148
            if (d >= 0) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   149
                x += sx;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   150
                d -= ay;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   151
            }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   152
            y += sy;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   153
            lineAddr += yOffset;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   154
            d += ax;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   155
        }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   156
    }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   157
}
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   158
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   159
void Surface::flip ()
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   160
{
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   161
    SDL_Flip (screen);
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   162
}
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   163
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   164
void Surface::setColor (foregroundColor c)
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   165
{
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   166
    switch (c) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   167
    case BLACK:
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   168
        color = black;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   169
        break;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   170
    case RED:
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   171
        color = red;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   172
        break;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   173
    };
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   174
}