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annotate src/video/SDL_drawline.c @ 3502:98a819296cdc

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Whenever a window becomes fullscreen, shown, unminimized, and has input focus it will change the display to the corresponding fullscreen video mode. If it loses any of those properties the desktop mode will be restored.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 01 Dec 2009 08:56:12 +0000
parents 27d8b12e0e8e
children 0267b8b1595c
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_draw.h"
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25
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26
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27 int
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28 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
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29 {
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30 /* This function doesn't work on surfaces < 8 bpp */
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31 if (dst->format->BitsPerPixel < 8) {
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32 SDL_SetError("SDL_DrawLine(): Unsupported surface format");
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33 return (-1);
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34 }
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35
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36 /* Perform clipping */
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37 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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38 return (0);
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39 }
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40
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41 switch (dst->format->BytesPerPixel) {
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42 case 1:
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43 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL1);
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44 break;
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45 case 2:
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46 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL2);
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47 break;
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48 case 3:
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49 SDL_Unsupported();
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50 return -1;
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51 case 4:
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52 DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL4);
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53 break;
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54 }
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55 return 0;
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56 }
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57
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58 /* vi: set ts=4 sw=4 expandtab: */