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annotate src/video/SDL_rect.c @ 2297:9f712d1e77f2

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author Bob Pendleton <bob@pendleton.com>
date Sat, 12 Jan 2008 16:53:30 +0000
parents 12ea0fdc0df2
children 99210400e8b9
rev   line source
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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_rect_c.h"
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26
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27 SDL_bool
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28 SDL_HasIntersection(const SDL_Rect * A, const SDL_Rect * B)
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29 {
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30 int Amin, Amax, Bmin, Bmax;
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31
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32 /* Horizontal intersection */
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33 Amin = A->x;
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34 Amax = Amin + A->w;
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35 Bmin = B->x;
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36 Bmax = Bmin + B->w;
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37 if (Bmin > Amin)
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38 Amin = Bmin;
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39 if (Bmax < Amax)
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40 Amax = Bmax;
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41 if (Amax <= Amin)
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42 return SDL_FALSE;
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43
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44 /* Vertical intersection */
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45 Amin = A->y;
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46 Amax = Amin + A->h;
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47 Bmin = B->y;
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48 Bmax = Bmin + B->h;
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49 if (Bmin > Amin)
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50 Amin = Bmin;
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51 if (Bmax < Amax)
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52 Amax = Bmax;
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53 if (Amax <= Amin)
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54 return SDL_FALSE;
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55
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56 return SDL_TRUE;
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57 }
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58
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59 SDL_bool
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60 SDL_IntersectRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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61 {
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62 int Amin, Amax, Bmin, Bmax;
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63
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64 /* Horizontal intersection */
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65 Amin = A->x;
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66 Amax = Amin + A->w;
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67 Bmin = B->x;
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68 Bmax = Bmin + B->w;
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69 if (Bmin > Amin)
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70 Amin = Bmin;
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71 result->x = Amin;
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72 if (Bmax < Amax)
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73 Amax = Bmax;
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74 result->w = Amax - Amin;
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75
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76 /* Vertical intersection */
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77 Amin = A->y;
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78 Amax = Amin + A->h;
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79 Bmin = B->y;
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80 Bmax = Bmin + B->h;
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81 if (Bmin > Amin)
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82 Amin = Bmin;
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83 result->y = Amin;
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84 if (Bmax < Amax)
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85 Amax = Bmax;
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86 result->h = Amax - Amin;
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87
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88 return !SDL_RectEmpty(result);
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89 }
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90
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91 void
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92 SDL_UnionRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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93 {
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94 int Amin, Amax, Bmin, Bmax;
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95
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96 /* Horizontal union */
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97 Amin = A->x;
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98 Amax = Amin + A->w;
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99 Bmin = B->x;
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100 Bmax = Bmin + B->w;
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101 if (Bmin < Amin)
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102 Amin = Bmin;
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103 result->x = Amin;
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104 if (Bmax > Amax)
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105 Amax = Bmax;
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106 result->w = Amax - Amin;
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107
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108 /* Vertical intersection */
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109 Amin = A->y;
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110 Amax = Amin + A->h;
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111 Bmin = B->y;
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112 Bmax = Bmin + B->h;
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113 if (Bmin < Amin)
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114 Amin = Bmin;
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115 result->y = Amin;
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116 if (Bmax > Amax)
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117 Amax = Bmax;
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118 result->h = Amax - Amin;
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119 }
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120
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121 void
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122 SDL_AddDirtyRect(SDL_DirtyRectList * list, const SDL_Rect * rect)
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123 {
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124 SDL_DirtyRect *dirty;
2223
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125
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126 /* FIXME: At what point is this optimization too expensive? */
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127 for (dirty = list->list; dirty; dirty = dirty->next) {
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128 if (SDL_HasIntersection(&dirty->rect, rect)) {
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129 SDL_UnionRect(&dirty->rect, rect, &dirty->rect);
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130 return;
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131 }
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132 }
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133
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134 if (list->free) {
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135 dirty = list->free;
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136 list->free = dirty->next;
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137 } else {
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138 dirty = (SDL_DirtyRect *) SDL_malloc(sizeof(*dirty));
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139 if (!dirty) {
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140 return;
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141 }
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142 }
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143 dirty->rect = *rect;
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144 dirty->next = list->list;
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145 list->list = dirty;
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146 }
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147
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148 void
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149 SDL_ClearDirtyRects(SDL_DirtyRectList * list)
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150 {
2224
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151 SDL_DirtyRect *prev, *curr;
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152
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153 /* Skip to the end of the free list */
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154 prev = NULL;
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155 for (curr = list->free; curr; curr = curr->next) {
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156 prev = curr;
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157 }
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158
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159 /* Add the list entries to the end */
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160 if (prev) {
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161 prev->next = list->list;
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162 } else {
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163 list->free = list->list;
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164 }
2223
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165 list->list = NULL;
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166 }
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167
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168 void
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169 SDL_FreeDirtyRects(SDL_DirtyRectList * list)
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170 {
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171 while (list->list) {
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172 SDL_DirtyRect *elem = list->list;
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173 list->list = elem->next;
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174 SDL_free(elem);
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175 }
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176 while (list->free) {
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177 SDL_DirtyRect *elem = list->free;
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178 list->free = elem->next;
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179 SDL_free(elem);
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180 }
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181 }
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182
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183 /* vi: set ts=4 sw=4 expandtab: */