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annotate src/video/SDL_rect.c @ 4425:a3e71b957215

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Fixed bug #961 Kalle Olavi Niemitalo 2010-02-28 09:15:50 PST It seems the SDLK_LMETA and SDLK_RMETA constants have been removed from SDL 1.3. I grepped for them in the SDL source tree and these were the only hits: ./include/SDL_compat.h:230:#define SDLK_LSUPER SDLK_LMETA ./include/SDL_compat.h:231:#define SDLK_RSUPER SDLK_RMETA ./src/video/bwindow/SDL_BWin.h:194: keymap[0x66] = SDLK_LMETA; ./src/video/bwindow/SDL_BWin.h:195: keymap[0x67] = SDLK_RMETA; I don't know how compatible SDL 1.3 is supposed to be with applications designed for SDL 1.2. However, as you can see, SDL itself is still trying to use the removed constants, and that is clearly a bug. Because SDL_compat.h defines KMOD_LMETA as KMOD_LGUI, I suppose it should also define SDLK_LMETA as SDLK_LGUI, and SDLK_RMETA likewise.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 09 Mar 2010 06:07:48 +0000
parents f7b03b6838cb
children 0a5dbe96c3be
rev   line source
1895
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1 /*
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2 SDL - Simple DirectMedia Layer
3697
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3 Copyright (C) 1997-2010 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_EnclosePoints(const SDL_Point * points, int count, const SDL_Rect * clip,
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123 SDL_Rect * result)
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124 {
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Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
125 int minx, miny;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
126 int maxx, maxy;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 3046
diff changeset
127 int x, y, i;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 3046
diff changeset
128
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
129 if (count < 1) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 3046
diff changeset
130 return SDL_FALSE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
131 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
132
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
133 if (clip) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
134 SDL_bool added = SDL_FALSE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
135 int clip_minx = clip->x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
136 int clip_miny = clip->y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
137 int clip_maxx = clip->x+clip->w-1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 3046
diff changeset
138 int clip_maxy = clip->y+clip->h-1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 3046
diff changeset
139
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
140 for (i = 0; i < count; ++i) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 3046
diff changeset
141 x = points[i].x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
142 y = points[i].y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
143
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
144 if (x < clip_minx || x > clip_maxx ||
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
145 y < clip_miny || y > clip_maxy) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
146 continue;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
147 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
148 if (!added) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
149 minx = maxx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
150 miny = maxy = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
151 added = SDL_TRUE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
152 continue;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
153 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
154 if (x < minx) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
155 minx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
156 } else if (x > maxx) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
157 maxx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
158 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
159 if (y < miny) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
160 miny = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
161 } else if (y > maxy) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
162 maxy = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
163 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
164 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
165 if (!added) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
166 return SDL_FALSE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
167 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
168 } else {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
169 /* No clipping, always add the first point */
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
170 minx = maxx = points[0].x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
171 miny = maxy = points[0].y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
172
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
173 for (i = 1; i < count; ++i) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
174 x = points[i].x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
175 y = points[i].y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 3046
diff changeset
176
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
177 if (x < minx) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
178 minx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
179 } else if (x > maxx) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
180 maxx = x;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
181 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
182 if (y < miny) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
183 miny = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
184 } else if (y > maxy) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
185 maxy = y;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
186 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
187 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
188 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
189
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
190 if (result) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
191 result->x = minx;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
192 result->y = miny;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
193 result->w = (maxx-minx)+1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
194 result->h = (maxy-miny)+1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
195 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
196 return SDL_TRUE;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
197 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
198
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
199 /* Use the Cohen-Sutherland algorithm for line clipping */
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
200 #define CODE_BOTTOM 1
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
201 #define CODE_TOP 2
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
202 #define CODE_LEFT 4
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
203 #define CODE_RIGHT 8
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
204
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
205 static int ComputeOutCode(const SDL_Rect * rect, int x, int y)
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
206 {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
207 int code = 0;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
208 if (y < 0) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
209 code |= CODE_TOP;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
210 } else if (y >= rect->y + rect->h) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
211 code |= CODE_BOTTOM;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
212 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
213 if (x < 0) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
214 code |= CODE_LEFT;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
215 } else if (x >= rect->x + rect->w) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
216 code |= CODE_RIGHT;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
217 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
218 return code;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
219 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
220
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 3046
diff changeset
221 SDL_bool
2920
Sam Lantinga <slouken@libsdl.org>
parents: 2909
diff changeset
222 SDL_IntersectRectAndLine(const SDL_Rect * rect, int *X1, int *Y1, int *X2,
Sam Lantinga <slouken@libsdl.org>
parents: 2909
diff changeset
223 int *Y2)
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
224 {
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
225 int x, y;
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
226 int x1, y1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
227 int x2, y2;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
228 int rectx1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
229 int recty1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
230 int rectx2;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
231 int recty2;
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
232 int outcode1, outcode2;
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
233
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
234 if (!rect || !X1 || !Y1 || !X2 || !Y2) {
3046
47965eacde88 Fix recommended by Eddy L O Jansson
Sam Lantinga <slouken@libsdl.org>
parents: 3004
diff changeset
235 return SDL_FALSE;
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
236 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
237
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
238 x1 = *X1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
239 y1 = *Y1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
240 x2 = *X2;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
241 y2 = *Y2;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
242 rectx1 = rect->x;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
243 recty1 = rect->y;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
244 rectx2 = rect->x + rect->w - 1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
245 recty2 = rect->y + rect->h - 1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
246
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
247 /* Check to see if entire line is inside rect */
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
248 if (x1 >= rectx1 && x1 <= rectx2 && x2 >= rectx1 && x2 <= rectx2 &&
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
249 y1 >= recty1 && y1 <= recty2 && y2 >= recty1 && y2 <= recty2) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
250 return SDL_TRUE;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
251 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
252
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
253 /* 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
254 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
255 (y1 < recty1 && y2 < recty1) || (y1 > recty2 && y2 > recty2)) {
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
256 return SDL_FALSE;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
257 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
258
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
259 if (y1 == y2) {
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
260 /* Horizontal line, easy to clip */
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
261 if (x1 < rectx1) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
262 *X1 = rectx1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
263 } else if (x1 > rectx2) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
264 *X1 = rectx2;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
265 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
266 if (x2 < rectx1) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
267 *X2 = rectx1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
268 } else if (x2 > rectx2) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
269 *X2 = rectx2;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
270 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
271 return SDL_TRUE;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
272 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
273
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
274 if (x1 == x2) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
275 /* Vertical line, easy to clip */
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
276 if (y1 < recty1) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
277 *Y1 = recty1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
278 } else if (y1 > recty2) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
279 *Y1 = recty2;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
280 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
281 if (y2 < recty1) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
282 *Y2 = recty1;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
283 } else if (y2 > recty2) {
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
284 *Y2 = recty2;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
285 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
286 return SDL_TRUE;
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
287 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
288
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
289 /* More complicated Cohen-Sutherland algorithm */
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
290 outcode1 = ComputeOutCode(rect, x1, y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
291 outcode2 = ComputeOutCode(rect, x2, y2);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
292 while (outcode1 || outcode2) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
293 if (outcode1 & outcode2) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
294 return SDL_FALSE;
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
295 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
296
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
297 if (outcode1) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
298 if (outcode1 & CODE_TOP) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
299 y = recty1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
300 x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
301 } else if (outcode1 & CODE_BOTTOM) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
302 y = recty2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
303 x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
304 } else if (outcode1 & CODE_LEFT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
305 x = rectx1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
306 y = y1 + ((y2 - y1) * (x - x1)) / (x2 - x1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
307 } else if (outcode1 & CODE_RIGHT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
308 x = rectx2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
309 y = y1 + ((y2 - y1) * (x - x1)) / (x2 - x1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
310 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
311 x1 = x;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
312 y1 = y;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
313 outcode1 = ComputeOutCode(rect, x, y);
3542
97eae5a705f9 Make sure we fully clip the first point before starting to adjust the second point.
Sam Lantinga <slouken@libsdl.org>
parents: 3541
diff changeset
314 } else {
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
315 if (outcode2 & CODE_TOP) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
316 y = recty1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
317 x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
318 } else if (outcode2 & CODE_BOTTOM) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
319 y = recty2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
320 x = x1 + ((x2 - x1) * (y - y1)) / (y2 - y1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
321 } else if (outcode2 & CODE_LEFT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
322 x = rectx1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
323 y = y1 + ((y2 - y1) * (x - x1)) / (x2 - x1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
324 } else if (outcode2 & CODE_RIGHT) {
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
325 x = rectx2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
326 y = y1 + ((y2 - y1) * (x - x1)) / (x2 - x1);
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
327 }
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
328 x2 = x;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
329 y2 = y;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
330 outcode2 = ComputeOutCode(rect, x, y);
2994
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
331 }
7563b99e9a49 Date: Sat, 3 Jan 2009 22:11:18 -0500
Sam Lantinga <slouken@libsdl.org>
parents: 2920
diff changeset
332 }
3541
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
333 *X1 = x1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
334 *Y1 = y1;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
335 *X2 = x2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
336 *Y2 = y2;
0c429a5fda8a Added an automated test for rectangle routines, currently only testing line clipping.
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
337 return SDL_TRUE;
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
338 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
339
1895
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
340 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
341 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.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
342 {
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
343 SDL_DirtyRect *dirty;
2223
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
344
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
345 /* FIXME: At what point is this optimization too expensive? */
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
346 for (dirty = list->list; dirty; dirty = dirty->next) {
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
347 if (SDL_HasIntersection(&dirty->rect, rect)) {
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
348 SDL_UnionRect(&dirty->rect, rect, &dirty->rect);
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
349 return;
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
350 }
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
351 }
1895
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
352
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
353 if (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
354 dirty = 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
355 list->free = dirty->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
356 } else {
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
357 dirty = (SDL_DirtyRect *) SDL_malloc(sizeof(*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
358 if (!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
359 return;
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
360 }
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
361 }
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
362 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
363 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
364 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
365 }
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
366
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
367 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
368 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
369 {
2224
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
370 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
371
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
372 /* 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
373 prev = NULL;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
374 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
375 prev = curr;
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
376 }
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
377
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
378 /* 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
379 if (prev) {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
380 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
381 } else {
29cc9e9c76bd Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()
Sam Lantinga <slouken@libsdl.org>
parents: 2223
diff changeset
382 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
383 }
2223
175754591a13 Optimized dirty rect code
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
384 list->list = NULL;
1895
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
385 }
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
386
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
387 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
388 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
389 {
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
390 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
391 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
392 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
393 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
394 }
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
395 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
396 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
397 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
398 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:
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399 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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400 }
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
401
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
402 /* vi: set ts=4 sw=4 expandtab: */