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annotate src/video/SDL_rect.c @ 2860:6ce28e5287e9

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Date: Sun, 07 Dec 2008 13:35:23 +0100 From: Couriersud Subject: SDL: Mouse last_x, last_y into SDL_Mouse the attached diff moves the static vars last_x and last_y into SDL_Mouse. These, as far as I understand it, should be tied to the individual mouse. The patch also makes the code check for out of window conditions of mouse->x,y when relative movements are passed to MouseSendMotion. Also attached is the latest DirectFB code (dfb20081208) supporting multiple mice and keyboards. This works quite well with sdlmame now. It however needs more testing with different directfb configurations.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 08 Dec 2008 00:52:12 +0000
parents 99210400e8b9
children 3da0bb421d83
rev   line source
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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1 /*
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2 SDL - Simple DirectMedia Layer
2859
99210400e8b9 Updated copyright date
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3 Copyright (C) 1997-2009 Sam Lantinga
1895
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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
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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
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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: */