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annotate dmlineclip.h @ 262:9d015d32841a

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Clean up the line clipping a bit, in preparation for fixes.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 10 Oct 2012 12:11:20 +0300
parents a2abd0b991b6
children 200329bb7688
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
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1 #ifndef DM_HEADER
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2 #define DM_CLIP_BITS(Q, x, y) \
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3 do { \
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4 Q = 0; \
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5 if (x < clipX0) Q |= CLIP_TOP; \
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6 else \
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7 if (x > clipX1) Q |= CLIP_BOTTOM; \
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8 if (y < clipY0) Q |= CLIP_RIGHT; \
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9 else \
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10 if (y > clipY1) Q |= CLIP_LEFT; \
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11 } while (0)
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12
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13 #define xA (*x0)
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14 #define xB (*x1)
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15 #define yA (*y0)
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16 #define yB (*y1)
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17 #endif
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18
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19
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20 int DM_CLIP_FUNC (SDL_Surface *screen, DM_COORD_TYPE *x0, DM_COORD_TYPE *y0, DM_COORD_TYPE *x1, DM_COORD_TYPE *y1)
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21 #ifdef DM_HEADER
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22 ;
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23 #else
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24 {
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25 const DM_COORD_TYPE
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26 clipX0 = screen->clip_rect.x,
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27 clipY0 = screen->clip_rect.y,
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28 clipX1 = clipX0 + screen->clip_rect.w - 1,
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29 clipY1 = clipY0 + screen->clip_rect.h - 1;
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30
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31 int clipA, clipB;
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32
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33 DM_CLIP_BITS(clipA, xA, yA);
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34 DM_CLIP_BITS(clipB, xB, yB);
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35
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36 // The line segment is outside of the clip region
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37 if (clipA & clipB)
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38 return -1;
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39
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40 // The segment is inside?
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41 if ((clipA | clipB) == 0)
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42 return 0;
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43
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44 #if 1
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45 // Cohen-Sutherland clipping method
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46 do
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47 {
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48 const int c = clipA ? clipA : clipB;
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49 DM_COORD_TYPE x, y;
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50
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51 if (c & CLIP_TOP)
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52 {
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53 y = yA + ((clipX0 + xA) * (yB - yA)) / xB - xA;
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54 x = clipX0;
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55 }
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56 else
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57 if (c & CLIP_BOTTOM)
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58 {
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59 y = yA + ((clipX1 - xA)*(yB - yA)) / (xB - xA);
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60 x = clipX1;
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61 }
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62 else
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63 if (c & CLIP_RIGHT)
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64 {
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65 x = xA + ((clipY0 - yA)*(xB - xA)) / (yB - yA);
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66 y = clipY0;
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67 }
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68 else
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69 if (c & CLIP_LEFT)
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70 {
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71 x = xA + ((clipY1 - yA)*(xB - xA)) / (yB - yA);
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72 y = clipY1;
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73 }
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74
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75 if (c == clipA)
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76 {
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77 xA = x;
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78 yA = y;
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79 DM_CLIP_BITS(clipA, xA, yA);
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80 }
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81 else
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82 {
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83 xB = x;
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84 yB = y;
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85 DM_CLIP_BITS(clipB, xB, yB);
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86 }
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87
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88 } while (clipA | clipB);
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89 #else
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90 // Buyu-Skala clipping method
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91 const DM_COORD_TYPE dx = xB - xA;
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92 const DM_COORD_TYPE dy = yB - yA;
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93 float k, m;
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94 int z;
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95
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96 switch (clipA + clipB)
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97 {
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98 case 1:
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99 if (clipA == 1)
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100 {
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101 xA = clipX0;
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102 yA = (clipX0 - xB) * dy / dx + yB;
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103 }
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104 else
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105 {
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106 xB = clipX0;
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107 yB = (clipX0 - xA) * dy / dx + yA;
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108 }
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109 break;
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110
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111 case 3:
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112 k = dy / dx;
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113 yA = (clipX0 - xA) * k + yA;
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114 xA = clipX0;
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115 yB = (clipX1 - xB) * k + yB;
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116 xB = clipX1;
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117 break;
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118
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119 case 5:
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120 k = dy / dx;
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121 z = (clipX0 - xA) * k + yA;
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122 if (z < clipY0)
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123 {
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124 switch (clipA)
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125 {
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126 case 0:
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127 xB = xB + (clipY0 - yB) / k;
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128 yB = clipY0;
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129 break;
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diff changeset
130 case 5:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
131 xA = xA + (clipY0 - yA) / k;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
132 yA = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
133 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
134
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
135 default:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
136 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
137 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
138 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
139 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
140 {
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
141 switch (clipA)
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
142 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
143 case 0:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
144 xB = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
145 yB = z;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
146 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
147 case 1:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
148 xB = xB + (clipY0 - yB) / k;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
149 yB = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
150 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
151 yA = z;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
152 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
153 case 4:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
154 xA = xA + (clipY0 - yA) / k;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
155 yA = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
156 xB = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
157 yB = z;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
158 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
159 case 5:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
160 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
161 yA = z;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
162 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
163 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
164 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
165 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
166
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
167 case 7:
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
168 switch (clipA)
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
169 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
170 case 1:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
171 k = dy / dx;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
172 yA = (clipX0 - xB) * k + yB;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
173 if (yA < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
174 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
175 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
176 yB = (clipX1 - clipX0) * k + yA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
177 if (yB < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
178 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
179 xB = (clipY0 - yB) / k + clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
180 yB = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
181 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
182 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
183 xB = clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
184 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
185
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
186 /* similarly for cases clipA == 2, 5, 6 */
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
187 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
188 case 15:
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
189 switch (clipA)
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
190 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
191 case 5:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
192 if (dy * (clipX1 - clipX0) < dx * (clipY1 - clipY0))
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
193 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
194 k = dy / dx;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
195 yA = (clipX0 - xB) * k + yB;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
196 if (yA > clipY1)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
197 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
198 yB = (clipX1 - clipX0) * k + yA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
199 if (yB < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
200 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
201 if (yA < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
202 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
203 xA = (clipY0 - yA) / k + clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
204 yA = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
205 xB = clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
206 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
207 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
208 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
209 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
210 if (yB > clipY1)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
211 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
212 xB = (clipY1 - yB) / k + clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
213 yB = clipY1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
214 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
215 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
216 xB = clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
217 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
218 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
219 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
220 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
221 m = dx / dy;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
222 xA = (clipY0 - yB) * m + xB;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
223 if (xA > clipX1)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
224 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
225 xB = (clipY1 - clipY0) * m + xA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
226 if (xB < clipX0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
227 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
228 if (xA < clipX0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
229 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
230 yA = (clipX0 - xA) / m + clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
231 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
232 yB = clipY1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
233 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
234 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
235 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
236 yA = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
237 if (xB > clipX1)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
238 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
239 yB = (clipX1 - xB) / m + clipY1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
240 xB = clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
241 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
242 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
243 yB = clipY1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
244 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
245 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
246
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
247 /* similarly for cases clipA == 6, 9, 10 */
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
248 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
249
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
250 /* cases 2, 4, 8 are similar as case 1, cases 6, 9, 10 are similar as case 5 */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
251 /* cases 11, 13, 14 are similar as case 7, case 12 is similar case 3 */
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
252 } /* of case clipA + clipB */
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
253 #endif
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
254
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
255 return 1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
256 }
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
257
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
258 #undef DM_CLIP_BITS
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
259 #undef xA
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
260 #undef xB
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
261 #undef yA
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
262 #undef yB
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
263
234
a2abd0b991b6 Modularize line drawing related templates and functions, add clipping
Matti Hamalainen <ccr@tnsp.org>
parents: 232
diff changeset
264 #endif
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
265
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
266 #undef DM_CLIP_FUNC
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
267 #undef DM_COORD_TYPE