pmc/surface.cc
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sun, 27 Sep 2009 10:56:49 +0200
changeset 107 244356bc3a20
parent 77 49e0babccb23
child 129 d82830a449a9
permissions -rw-r--r--
Pipes and COPY-ON-WRITE In this example, every forked process gets its own copy of the countervariable i through copy-on-write. committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * pmc/surface.cc
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 * Copyright (C) 2008 Markus Broeker
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 */
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#include <surface.hpp>
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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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    green = SDL_MapRGB (screen->format, 0x00, 0xff, 0x00);
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    blue = SDL_MapRGB (screen->format, 0x00, 0x00, 0xff);
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    black = SDL_MapRGB (screen->format, 0x00, 0x00, 0x00);
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    color = red;
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    bpp = screen->format->BytesPerPixel;
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    refCounter++;
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}
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Surface::~Surface ()
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{
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    SDL_FreeSurface (screen);
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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 (x < 0 || y < 0)
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        return;
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    if (x > width || y > height)
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        return;
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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 (bpp) {
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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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    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;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
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
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   119
    x = x1;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   120
    y = y1;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   121
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   122
    if (ax > ay) {              /* x dominant */
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   123
        d = ay - (ax >> 1);
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   124
        for (;;) {
46
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   125
            drawPixel (x, y);
42
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   126
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   127
            if (x == x2) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   128
                return;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   129
            }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   130
            if (d >= 0) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   131
                y += sy;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   132
                d -= ax;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   133
            }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   134
            x += sx;
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Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   135
            d += ay;
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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
    } else {                    /* y dominant */
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   138
        d = ax - (ay >> 1);
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   139
        for (;;) {
46
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   140
            drawPixel (x, y);
42
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   141
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   142
            if (y == y2) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   143
                return;
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 (d >= 0) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   146
                x += sx;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   147
                d -= ay;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   148
            }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   149
            y += sy;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   150
            d += ax;
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
    }
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   153
}
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   154
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   155
void Surface::flip ()
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
    SDL_Flip (screen);
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
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   160
void Surface::setColor (foregroundColor c)
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   161
{
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   162
    switch (c) {
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   163
    case BLACK:
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   164
        color = black;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   165
        break;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   166
    case RED:
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   167
        color = red;
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   168
        break;
46
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   169
    case GREEN:
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   170
        color = green;
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   171
        break;
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   172
    case BLUE:
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   173
        color = blue;
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   174
        break;
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   175
    default:
4b9e1ac40246 pmc: Screen Depth Fix: Paint on 8, 16 and 32 bpp
Markus Bröker <mbroeker@largo.dyndns.tv>
parents: 42
diff changeset
   176
        color = red;
42
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   177
    };
83b8151b966d Klassenhierarchie erneuert, Codebase erneuert
Markus Bröker <mbroeker@largo.dyndns.tv>
parents:
diff changeset
   178
}