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annotate src/video/SDL_rect.c @ 2920:cdb01906cb7e

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author Sam Lantinga <slouken@libsdl.org>
date Thu, 25 Dec 2008 05:26:29 +0000
parents 3da0bb421d83
children 7563b99e9a49
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
2859
99210400e8b9 Updated copyright date
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3 Copyright (C) 1997-2009 Sam Lantinga
1895
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4
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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5 This library is free software; you can redistribute it and/or
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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6 modify it under the terms of the GNU Lesser General Public
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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9
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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10 This library is distributed in the hope that it will be useful,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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13 Lesser General Public License for more details.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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16 License along with this library; if not, write to the Free Software
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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18
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19 Sam Lantinga
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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27 SDL_bool
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28 SDL_HasIntersection(const SDL_Rect * A, const SDL_Rect * B)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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29 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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30 int Amin, Amax, Bmin, Bmax;
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31
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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32 /* Horizontal intersection */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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37 if (Bmin > Amin)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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38 Amin = Bmin;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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39 if (Bmax < Amax)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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40 Amax = Bmax;
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41 if (Amax <= Amin)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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 SDL_bool
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122 SDL_IntersectRectAndLine(const SDL_Rect * rect, int *X1, int *Y1, int *X2,
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123 int *Y2)
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124 {
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125 int x1, y1;
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126 int x2, y2;
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127 int rectx1;
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128 int recty1;
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129 int rectx2;
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130 int recty2;
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131
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132 if (!rect || !X1 || !Y1 || !X2 || !Y2) {
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133 SDL_FALSE;
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134 }
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diff changeset
135
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136 x1 = *X1;
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diff changeset
137 y1 = *Y1;
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diff changeset
138 x2 = *X2;
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diff changeset
139 y2 = *Y2;
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140 rectx1 = rect->x;
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141 recty1 = rect->y;
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diff changeset
142 rectx2 = rect->x + rect->w - 1;
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143 recty2 = rect->y + rect->h - 1;
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144
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145 /* Check to see if entire line is inside rect */
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146 if (x1 >= rectx1 && x1 <= rectx2 && x2 >= rectx1 && x2 <= rectx2 &&
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147 y1 >= recty1 && y1 <= recty2 && y2 >= recty1 && y2 <= recty2) {
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148 return SDL_TRUE;
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diff changeset
149 }
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150
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diff changeset
151 /* Check to see if entire line is outside rect */
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152 if ((x1 < rectx1 && x2 < rectx1) || (x1 > rectx2 && x2 > rectx2) ||
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153 (y1 < recty1 && y2 < recty2) || (y1 > recty2 && y2 > recty2)) {
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154 return SDL_FALSE;
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parents: 2859
diff changeset
155 }
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156
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diff changeset
157 if (y1 = y2) {
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diff changeset
158 /* Horizontal line, easy to clip */
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diff changeset
159 if (x1 < rectx1) {
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160 *X1 = rectx1;
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161 } else if (x1 > rectx2) {
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162 *X1 = rectx2;
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diff changeset
163 }
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diff changeset
164 if (x2 < rectx1) {
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165 *X2 = rectx1;
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166 } else if (x2 > rectx2) {
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167 *X2 = rectx2;
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168 }
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169 return SDL_TRUE;
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170 }
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171
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172 if (x1 == x2) {
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173 /* Vertical line, easy to clip */
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174 if (y1 < recty1) {
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175 *Y1 = recty1;
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176 } else if (y1 > recty2) {
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177 *Y1 = recty2;
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diff changeset
178 }
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diff changeset
179 if (y2 < recty1) {
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180 *Y2 = recty1;
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diff changeset
181 } else if (y2 > recty2) {
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182 *Y2 = recty2;
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183 }
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diff changeset
184 return SDL_TRUE;
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diff changeset
185 }
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186
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187 /* FIXME: need code to clip diagonal line to rect */
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188 return SDL_FALSE;
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diff changeset
189 }
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190
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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191 void
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diff changeset
192 SDL_AddDirtyRect(SDL_DirtyRectList * list, const SDL_Rect * rect)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
193 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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194 SDL_DirtyRect *dirty;
2223
175754591a13 Optimized dirty rect code
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diff changeset
195
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diff changeset
196 /* FIXME: At what point is this optimization too expensive? */
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diff changeset
197 for (dirty = list->list; dirty; dirty = dirty->next) {
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diff changeset
198 if (SDL_HasIntersection(&dirty->rect, rect)) {
175754591a13 Optimized dirty rect code
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diff changeset
199 SDL_UnionRect(&dirty->rect, rect, &dirty->rect);
175754591a13 Optimized dirty rect code
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diff changeset
200 return;
175754591a13 Optimized dirty rect code
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diff changeset
201 }
175754591a13 Optimized dirty rect code
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diff changeset
202 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
203
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
204 if (list->free) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
205 dirty = list->free;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
206 list->free = dirty->next;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
207 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
208 dirty = (SDL_DirtyRect *) SDL_malloc(sizeof(*dirty));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
209 if (!dirty) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
210 return;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
211 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
213 dirty->rect = *rect;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 dirty->next = list->list;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 list->list = dirty;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 SDL_ClearDirtyRects(SDL_DirtyRectList * list)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
220 {
2224
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
221 SDL_DirtyRect *prev, *curr;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
222
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
223 /* Skip to the end of the free list */
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
224 prev = NULL;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
225 for (curr = list->free; curr; curr = curr->next) {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
226 prev = curr;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
227 }
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
228
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
229 /* Add the list entries to the end */
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
230 if (prev) {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
231 prev->next = list->list;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
232 } else {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
233 list->free = list->list;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
234 }
2223
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
235 list->list = NULL;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
236 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 SDL_FreeDirtyRects(SDL_DirtyRectList * list)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 while (list->list) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 SDL_DirtyRect *elem = list->list;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 list->list = elem->next;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 SDL_free(elem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 while (list->free) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 SDL_DirtyRect *elem = list->free;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 list->free = elem->next;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249 SDL_free(elem);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 /* vi: set ts=4 sw=4 expandtab: */