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annotate src/video/SDL_blendrect.c @ 2893:e67f3f3bf221

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Turn on line antialiasing (requires blending to be enabled)
author Sam Lantinga <slouken@libsdl.org>
date Sat, 20 Dec 2008 18:40:30 +0000
parents 32e8bbba1e94
children 1ef2f1e75ff7
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
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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_video.h"
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25 #include "SDL_blit.h"
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26
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27
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28 int
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29 SDL_BlendRect(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r,
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30 Uint8 g, Uint8 b, Uint8 a)
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31 {
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32 /* This function doesn't work on surfaces < 8 bpp */
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33 if (dst->format->BitsPerPixel < 8) {
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34 SDL_SetError("SDL_BlendRect(): Unsupported surface format");
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35 return (-1);
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36 }
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37
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38 /* If 'dstrect' == NULL, then fill the whole surface */
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39 if (dstrect) {
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40 /* Perform clipping */
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41 if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
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42 return (0);
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43 }
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44 } else {
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45 dstrect = &dst->clip_rect;
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46 }
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47
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48 SDL_Unsupported();
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49 return -1;
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50 }
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51
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52 /* vi: set ts=4 sw=4 expandtab: */