Mercurial > sdl-ios-xcode
annotate src/video/SDL_rect.c @ 3796:b19680c84cdf SDL-ryan-multiple-audio-device
Bunch of 1.3 audio cleanups to remove FIXMEs, get driver specific crap out of
the core and into the drivers where it belongs, and push generic
responsibilities out of the drivers and into the core where they belong.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Wed, 04 Oct 2006 19:54:23 +0000 |
parents | c121d94672cb |
children | 175754591a13 |
rev | line source |
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1895
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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 |
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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_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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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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185 SDL_free(elem); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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186 } |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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187 } |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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188 |
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189 /* vi: set ts=4 sw=4 expandtab: */ |