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annotate src/video/SDL_rect.c @ 3294:470d0a416aa7

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Fixed bug #714 fuzzyTew@gmail.com 2009-03-14 15:18:45 PDT patch to change HAVE_ICONV to HAVE_ICONV_H There are two separate iconv checks in configure -- one for the header file and one for the library. include/SDL_stdinc.h uses the library define to see whether or not it should reference the types defined in the header, which naturally breaks if the library exists and the header does not.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 11:04:01 +0000
parents 47965eacde88
children 0267b8b1595c
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
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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 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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parents: 2859
diff changeset
130 int recty2;
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diff changeset
131
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parents: 2859
diff changeset
132 if (!rect || !X1 || !Y1 || !X2 || !Y2) {
3046
47965eacde88 Fix recommended by Eddy L O Jansson
Sam Lantinga <slouken@libsdl.org>
parents: 3004
diff changeset
133 return SDL_FALSE;
2909
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
134 }
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parents: 2859
diff changeset
135
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
136 x1 = *X1;
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parents: 2859
diff changeset
137 y1 = *Y1;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
138 x2 = *X2;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
139 y2 = *Y2;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
140 rectx1 = rect->x;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
141 recty1 = rect->y;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
142 rectx2 = rect->x + rect->w - 1;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
143 recty2 = rect->y + rect->h - 1;
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parents: 2859
diff changeset
144
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
145 /* Check to see if entire line is inside rect */
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
146 if (x1 >= rectx1 && x1 <= rectx2 && x2 >= rectx1 && x2 <= rectx2 &&
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
147 y1 >= recty1 && y1 <= recty2 && y2 >= recty1 && y2 <= recty2) {
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parents: 2859
diff changeset
148 return SDL_TRUE;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
149 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
150
2994
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parents: 2920
diff changeset
151 /* Check to see if entire line is to one side of rect */
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
152 if ((x1 < rectx1 && x2 < rectx1) || (x1 > rectx2 && x2 > rectx2) ||
3004
f3d7226a8dfd Fixed lines intersecting the top corners of a rectangle
Sam Lantinga <slouken@libsdl.org>
parents: 2997
diff changeset
153 (y1 < recty1 && y2 < recty1) || (y1 > recty2 && y2 > recty2)) {
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
154 return SDL_FALSE;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
155 }
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
156
2994
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parents: 2920
diff changeset
157 if (y1 == y2) {
2909
3da0bb421d83 Added line clipping
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parents: 2859
diff changeset
158 /* Horizontal line, easy to clip */
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
159 if (x1 < rectx1) {
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
160 *X1 = rectx1;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
161 } else if (x1 > rectx2) {
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
162 *X1 = rectx2;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
163 }
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
164 if (x2 < rectx1) {
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
165 *X2 = rectx1;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
166 } else if (x2 > rectx2) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
167 *X2 = rectx2;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
168 }
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
169 return SDL_TRUE;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
170 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
171
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
172 if (x1 == x2) {
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
173 /* Vertical line, easy to clip */
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
174 if (y1 < recty1) {
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
175 *Y1 = recty1;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
176 } else if (y1 > recty2) {
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
177 *Y1 = recty2;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
178 }
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
179 if (y2 < recty1) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
180 *Y2 = recty1;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
181 } else if (y2 > recty2) {
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
182 *Y2 = recty2;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
183 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
184 return SDL_TRUE;
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
185 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
186
2997
Sam Lantinga <slouken@libsdl.org>
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diff changeset
187 else {
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
188 /* The task of clipping a line with finite slope ratios in a fixed-
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
189 * precision coordinate space is not as immediately simple as it is
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
190 * with coordinates of arbitrary precision. If the ratio of slopes
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
191 * between the input line segment and the result line segment is not
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
192 * a whole number, you have in fact *moved* the line segment a bit,
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
193 * and there can be no avoiding it without more precision
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
194 */
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
195 int *x_result_[] = { X1, X2, NULL }, **x_result = x_result_;
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
196 int *y_result_[] = { Y1, Y2, NULL }, **y_result = y_result_;
2994
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Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
197 SDL_bool intersection = SDL_FALSE;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
198 double b, m, left, right, bottom, top;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
199 int xl, xh, yl, yh;
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Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
200
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
201 /* solve mx+b line formula */
2997
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
202 m = (double) (y1 - y2) / (double) (x1 - x2);
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
203 b = y2 - m * (double) x2;
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Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
204
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
205 /* find some linear intersections */
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
206 left = (m * (double) rectx1) + b;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
207 right = (m * (double) rectx2) + b;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
208 top = (recty1 - b) / m;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
209 bottom = (recty2 - b) / m;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
210
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
211 /* sort end-points' x and y components individually */
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
212 if (x1 < x2) {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
213 xl = x1;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
214 xh = x2;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
215 } else {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
216 xl = x2;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
217 xh = x1;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
218 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
219 if (y1 < y2) {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
220 yl = y1;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
221 yh = y2;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
222 } else {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
223 yl = y2;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
224 yh = y1;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
225 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
226
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
227 #define RISING(a, b, c) (((a)<=(b))&&((b)<=(c)))
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
228
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
229 /* check for a point that's entirely inside the rect */
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
230 if (RISING(rectx1, x1, rectx2) && RISING(recty1, y1, recty2)) {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
231 x_result++;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
232 y_result++;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
233 intersection = SDL_TRUE;
2997
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
234 } else
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
235 /* it was determined earlier that *both* end-points are not contained */
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
236 if (RISING(rectx1, x2, rectx2) && RISING(recty1, y2, recty2)) {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
237 **(x_result++) = x2;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
238 **(y_result++) = y2;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
239 intersection = SDL_TRUE;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
240 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
241
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
242 if (RISING(recty1, left, recty2) && RISING(xl, rectx1, xh)) {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
243 **(x_result++) = rectx1;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
244 **(y_result++) = (int) left;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
245 intersection = SDL_TRUE;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
246 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
247
2997
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
248 if (*x_result == NULL)
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
249 return intersection;
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
250 if (RISING(recty1, right, recty2) && RISING(xl, rectx2, xh)) {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
251 **(x_result++) = rectx2;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
252 **(y_result++) = (int) right;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
253 intersection = SDL_TRUE;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
254 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
255
2997
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
256 if (*x_result == NULL)
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
257 return intersection;
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
258 if (RISING(rectx1, top, rectx2) && RISING(yl, recty1, yh)) {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
259 **(x_result++) = (int) top;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
260 **(y_result++) = recty1;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
261 intersection = SDL_TRUE;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
262 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
263
2997
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
264 if (*x_result == NULL)
Sam Lantinga <slouken@libsdl.org>
parents: 2994
diff changeset
265 return intersection;
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
266 if (RISING(rectx1, bottom, rectx2) && RISING(yl, recty2, yh)) {
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
267 **(x_result++) = (int) bottom;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
268 **(y_result++) = recty2;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
269 intersection = SDL_TRUE;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
270 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
271
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
272 return intersection;
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
273 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
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parents: 2920
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274
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275 return SDL_FALSE;
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276 }
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277
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278 void
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279 SDL_AddDirtyRect(SDL_DirtyRectList * list, const SDL_Rect * rect)
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280 {
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281 SDL_DirtyRect *dirty;
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282
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283 /* FIXME: At what point is this optimization too expensive? */
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284 for (dirty = list->list; dirty; dirty = dirty->next) {
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285 if (SDL_HasIntersection(&dirty->rect, rect)) {
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286 SDL_UnionRect(&dirty->rect, rect, &dirty->rect);
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287 return;
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288 }
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289 }
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290
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291 if (list->free) {
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292 dirty = list->free;
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293 list->free = dirty->next;
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294 } else {
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295 dirty = (SDL_DirtyRect *) SDL_malloc(sizeof(*dirty));
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296 if (!dirty) {
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297 return;
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298 }
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299 }
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300 dirty->rect = *rect;
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301 dirty->next = list->list;
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302 list->list = dirty;
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303 }
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304
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305 void
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306 SDL_ClearDirtyRects(SDL_DirtyRectList * list)
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307 {
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308 SDL_DirtyRect *prev, *curr;
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309
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310 /* Skip to the end of the free list */
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311 prev = NULL;
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312 for (curr = list->free; curr; curr = curr->next) {
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313 prev = curr;
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314 }
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315
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316 /* Add the list entries to the end */
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317 if (prev) {
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318 prev->next = list->list;
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319 } else {
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320 list->free = list->list;
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321 }
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322 list->list = NULL;
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323 }
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324
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325 void
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326 SDL_FreeDirtyRects(SDL_DirtyRectList * list)
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327 {
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328 while (list->list) {
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329 SDL_DirtyRect *elem = list->list;
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330 list->list = elem->next;
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331 SDL_free(elem);
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332 }
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333 while (list->free) {
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334 SDL_DirtyRect *elem = list->free;
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335 list->free = elem->next;
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336 SDL_free(elem);
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337 }
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338 }
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339
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340 /* vi: set ts=4 sw=4 expandtab: */