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annotate src/video/SDL_drawpoint.c @ 4474:119023057881

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author Sam Lantinga <slouken@libsdl.org>
date Sun, 27 Jun 2010 23:17:36 -0700
parents f7b03b6838cb
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color)
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29 {
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30 if (!dst) {
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31 SDL_SetError("Passed NULL destination surface");
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32 return -1;
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33 }
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34
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35 /* This function doesn't work on surfaces < 8 bpp */
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36 if (dst->format->BitsPerPixel < 8) {
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37 SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
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38 return -1;
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39 }
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40
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41 /* Perform clipping */
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42 if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
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43 x >= (dst->clip_rect.x + dst->clip_rect.w) ||
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44 y >= (dst->clip_rect.y + dst->clip_rect.h)) {
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45 return 0;
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46 }
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47
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48 switch (dst->format->BytesPerPixel) {
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49 case 1:
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50 DRAW_FASTSETPIXELXY1(x, y);
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51 break;
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52 case 2:
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53 DRAW_FASTSETPIXELXY2(x, y);
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54 break;
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55 case 3:
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56 SDL_Unsupported();
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57 return -1;
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58 case 4:
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59 DRAW_FASTSETPIXELXY4(x, y);
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60 break;
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61 }
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62 return 0;
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63 }
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64
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65 int
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66 SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count,
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67 Uint32 color)
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68 {
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69 int minx, miny;
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70 int maxx, maxy;
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71 int i;
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72 int x, y;
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73
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74 if (!dst) {
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75 SDL_SetError("Passed NULL destination surface");
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76 return -1;
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77 }
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78
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79 /* This function doesn't work on surfaces < 8 bpp */
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80 if (dst->format->BitsPerPixel < 8) {
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81 SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
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82 return -1;
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83 }
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84
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85 minx = dst->clip_rect.x;
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86 maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
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87 miny = dst->clip_rect.y;
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88 maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
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89
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90 for (i = 0; i < count; ++i) {
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91 x = points[i].x;
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92 y = points[i].y;
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93
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94 if (x < minx || x > maxx || y < miny || y > maxy) {
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95 continue;
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96 }
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97
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98 switch (dst->format->BytesPerPixel) {
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99 case 1:
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100 DRAW_FASTSETPIXELXY1(x, y);
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101 break;
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102 case 2:
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103 DRAW_FASTSETPIXELXY2(x, y);
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104 break;
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105 case 3:
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106 SDL_Unsupported();
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107 return -1;
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108 case 4:
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109 DRAW_FASTSETPIXELXY4(x, y);
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110 break;
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111 }
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112 }
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113 return 0;
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114 }
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115
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116 /* vi: set ts=4 sw=4 expandtab: */