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annotate src/render/software/SDL_drawpoint.c @ 5221:16d5e8e90e01

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Updated testoverlay2 to use the SDL 2D rendering API
author Sam Lantinga <slouken@libsdl.org>
date Mon, 07 Feb 2011 00:46:43 -0800
parents d72793305335
children 710d00cb3a6a
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 #include "SDL_drawpoint.h"
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26
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27
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28 int
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29 SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color)
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30 {
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31 if (!dst) {
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32 SDL_SetError("Passed NULL destination surface");
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33 return -1;
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34 }
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35
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36 /* This function doesn't work on surfaces < 8 bpp */
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37 if (dst->format->BitsPerPixel < 8) {
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38 SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
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39 return -1;
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40 }
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41
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42 /* Perform clipping */
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43 if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
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44 x >= (dst->clip_rect.x + dst->clip_rect.w) ||
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45 y >= (dst->clip_rect.y + dst->clip_rect.h)) {
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46 return 0;
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47 }
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48
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49 switch (dst->format->BytesPerPixel) {
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50 case 1:
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51 DRAW_FASTSETPIXELXY1(x, y);
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52 break;
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53 case 2:
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54 DRAW_FASTSETPIXELXY2(x, y);
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55 break;
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56 case 3:
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57 SDL_Unsupported();
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58 return -1;
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59 case 4:
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60 DRAW_FASTSETPIXELXY4(x, y);
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61 break;
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62 }
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63 return 0;
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64 }
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65
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66 int
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67 SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count,
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68 Uint32 color)
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69 {
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70 int minx, miny;
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71 int maxx, maxy;
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72 int i;
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73 int x, y;
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74
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75 if (!dst) {
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76 SDL_SetError("Passed NULL destination surface");
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77 return -1;
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78 }
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79
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80 /* This function doesn't work on surfaces < 8 bpp */
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81 if (dst->format->BitsPerPixel < 8) {
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82 SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
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83 return -1;
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84 }
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85
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86 minx = dst->clip_rect.x;
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87 maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
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88 miny = dst->clip_rect.y;
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89 maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
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90
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91 for (i = 0; i < count; ++i) {
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92 x = points[i].x;
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93 y = points[i].y;
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94
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95 if (x < minx || x > maxx || y < miny || y > maxy) {
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96 continue;
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97 }
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98
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99 switch (dst->format->BytesPerPixel) {
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100 case 1:
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101 DRAW_FASTSETPIXELXY1(x, y);
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102 break;
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103 case 2:
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104 DRAW_FASTSETPIXELXY2(x, y);
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105 break;
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106 case 3:
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107 SDL_Unsupported();
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108 return -1;
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109 case 4:
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110 DRAW_FASTSETPIXELXY4(x, y);
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111 break;
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112 }
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113 }
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114 return 0;
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115 }
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116
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117 /* vi: set ts=4 sw=4 expandtab: */