Mercurial > sdl-ios-xcode
annotate src/video/SDL_drawpoint.c @ 3542:97eae5a705f9
Make sure we fully clip the first point before starting to adjust the second point.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 11 Dec 2009 09:57:54 +0000 |
| parents | 0267b8b1595c |
| children | f638ded38b8a |
| rev | line source |
|---|---|
| 2901 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997-2009 Sam Lantinga | |
| 4 | |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Lesser General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2.1 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Lesser General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Lesser General Public | |
| 16 License along with this library; if not, write to the Free Software | |
| 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| 18 | |
| 19 Sam Lantinga | |
| 20 slouken@libsdl.org | |
| 21 */ | |
| 22 #include "SDL_config.h" | |
| 23 | |
| 24 #include "SDL_draw.h" | |
| 25 | |
| 26 | |
| 27 int | |
| 28 SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color) | |
| 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 |
| 2901 | 35 /* This function doesn't work on surfaces < 8 bpp */ |
| 36 if (dst->format->BitsPerPixel < 8) { | |
| 3160 | 37 SDL_SetError("SDL_DrawPoint(): Unsupported surface format"); |
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38 return -1; |
| 2901 | 39 } |
| 40 | |
| 41 /* Perform clipping */ | |
| 42 if (x < dst->clip_rect.x || y < dst->clip_rect.y || | |
| 43 x >= (dst->clip_rect.x + dst->clip_rect.w) || | |
| 44 y >= (dst->clip_rect.y + dst->clip_rect.h)) { | |
| 45 return 0; | |
| 46 } | |
| 47 | |
| 48 switch (dst->format->BytesPerPixel) { | |
| 49 case 1: | |
| 50 DRAW_FASTSETPIXEL1(x, y); | |
| 51 break; | |
| 52 case 2: | |
| 53 DRAW_FASTSETPIXEL2(x, y); | |
| 54 break; | |
| 55 case 3: | |
| 56 SDL_Unsupported(); | |
| 57 return -1; | |
| 58 case 4: | |
| 59 DRAW_FASTSETPIXEL4(x, y); | |
| 60 break; | |
| 61 } | |
| 62 return 0; | |
| 63 } | |
| 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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parents:
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75 SDL_SetError("Passed NULL destination surface"); |
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parents:
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76 return -1; |
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parents:
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77 } |
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parents:
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78 |
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parents:
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79 /* This function doesn't work on surfaces < 8 bpp */ |
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parents:
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80 if (dst->format->BitsPerPixel < 8) { |
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parents:
3160
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81 SDL_SetError("SDL_DrawPoints(): Unsupported surface format"); |
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parents:
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82 return -1; |
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parents:
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83 } |
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parents:
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84 |
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parents:
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85 minx = dst->clip_rect.x; |
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parents:
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86 maxx = dst->clip_rect.x + dst->clip_rect.w - 1; |
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parents:
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87 miny = dst->clip_rect.y; |
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parents:
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88 maxy = dst->clip_rect.y + dst->clip_rect.h - 1; |
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parents:
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89 |
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parents:
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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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parents:
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96 } |
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parents:
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97 |
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parents:
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98 switch (dst->format->BytesPerPixel) { |
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99 case 1: |
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100 DRAW_FASTSETPIXEL1(x, y); |
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101 break; |
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102 case 2: |
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103 DRAW_FASTSETPIXEL2(x, y); |
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104 break; |
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parents:
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105 case 3: |
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106 SDL_Unsupported(); |
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parents:
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107 return -1; |
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parents:
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108 case 4: |
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109 DRAW_FASTSETPIXEL4(x, y); |
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parents:
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110 break; |
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parents:
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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 |
| 2901 | 116 /* vi: set ts=4 sw=4 expandtab: */ |