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annotate src/video/SDL_rect.c @ 1735:8dd28c4ef746 SDL-1.3

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SDL_Rect now uses int for position and size. Added a few more rectangle functions. Added a dirty rectangle list implementation.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 07:34:50 +0000
parents
children 175754591a13
rev   line source
1735
8dd28c4ef746 SDL_Rect now uses int for position and size.
Sam Lantinga <slouken@libsdl.org>
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1 /*
8dd28c4ef746 SDL_Rect now uses int for position and size.
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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
8dd28c4ef746 SDL_Rect now uses int for position and size.
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5 This library is free software; you can redistribute it and/or
8dd28c4ef746 SDL_Rect now uses int for position and size.
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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
8dd28c4ef746 SDL_Rect now uses int for position and size.
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8 version 2.1 of the License, or (at your option) any later version.
8dd28c4ef746 SDL_Rect now uses int for position and size.
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9
8dd28c4ef746 SDL_Rect now uses int for position and size.
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10 This library is distributed in the hope that it will be useful,
8dd28c4ef746 SDL_Rect now uses int for position and size.
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
8dd28c4ef746 SDL_Rect now uses int for position and size.
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
8dd28c4ef746 SDL_Rect now uses int for position and size.
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13 Lesser General Public License for more details.
8dd28c4ef746 SDL_Rect now uses int for position and size.
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14
8dd28c4ef746 SDL_Rect now uses int for position and size.
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15 You should have received a copy of the GNU Lesser General Public
8dd28c4ef746 SDL_Rect now uses int for position and size.
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16 License along with this library; if not, write to the Free Software
8dd28c4ef746 SDL_Rect now uses int for position and size.
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
8dd28c4ef746 SDL_Rect now uses int for position and size.
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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
8dd28c4ef746 SDL_Rect now uses int for position and size.
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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;
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125 SDL_DirtyRect *check, *prev, *next;
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126
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127 if (list->free) {
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128 dirty = list->free;
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129 list->free = dirty->next;
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130 } else {
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131 dirty = (SDL_DirtyRect *) SDL_malloc(sizeof(*dirty));
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132 if (!dirty) {
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133 return;
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134 }
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135 }
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136 dirty->rect = *rect;
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137
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138 /* FIXME: At what point is this optimization too expensive? */
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139 for (prev = NULL, check = list->list; check; check = next) {
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140 next = check->next;
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141
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142 if (SDL_HasIntersection(&dirty->rect, &check->rect)) {
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143 SDL_UnionRect(&dirty->rect, &check->rect, &dirty->rect);
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144 if (prev) {
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145 prev->next = next;
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146 } else {
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147 list->list = next;
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148 }
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149 check->next = list->free;
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150 list->free = check;
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151 --list->count;
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152 } else {
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153 prev = check;
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154 }
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155 }
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156
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157 dirty->next = list->list;
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158 list->list = dirty;
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159 ++list->count;
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160 }
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161
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162 void
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163 SDL_ClearDirtyRects(SDL_DirtyRectList * list)
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164 {
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165 while (list->list) {
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166 SDL_DirtyRect *elem = list->list;
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167 list->list = elem->next;
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168 elem->next = list->free;
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169 list->free = elem;
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170 }
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171 list->count = 0;
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172 }
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173
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174 void
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175 SDL_FreeDirtyRects(SDL_DirtyRectList * list)
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176 {
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177 while (list->list) {
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178 SDL_DirtyRect *elem = list->list;
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179 list->list = elem->next;
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180 SDL_free(elem);
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181 }
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182 while (list->free) {
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183 SDL_DirtyRect *elem = list->free;
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184 list->free = elem->next;
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185 SDL_free(elem);
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186 }
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187 }
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188
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189 /* vi: set ts=4 sw=4 expandtab: */