Mercurial > MadButterfly
annotate src/coord.c @ 638:683889344459
Skeleton of image loader for nodejs
author | Thinker K.F. Li <thinker@branda.to> |
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date | Mon, 26 Jul 2010 09:50:44 +0800 |
parents | a545f126d2bf |
children | 8e9481bf1cc0 |
rev | line source |
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2 | 1 /*! \brief Implement coordination tranform mechanism. |
2 * \file | |
3 * This file implements coordination transforming for containers. | |
4 */ | |
1 | 5 #include <stdio.h> |
6 #include <string.h> | |
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7 #include <math.h> |
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8 #include "mb_types.h" |
1 | 9 |
12 | 10 |
11 #define ASSERT(x) | |
12 | |
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13 /* To keep possibility of changing type of aix */ |
2 | 14 #define MUL(a, b) ((a) * (b)) |
15 #define ADD(a, b) ((a) + (b)) | |
16 #define DIV(a, b) ((a) / (b)) | |
17 #define SUB(a, b) ((a) - (b)) | |
18 | |
19 static void mul_matrix(co_aix *m1, co_aix *m2, co_aix *dst) { | |
20 dst[0] = ADD(MUL(m1[0], m2[0]), MUL(m1[1], m2[3])); | |
21 dst[1] = ADD(MUL(m1[0], m2[1]), MUL(m1[1], m2[4])); | |
22 dst[2] = ADD(ADD(MUL(m1[0], m2[2]), MUL(m1[1], m2[5])), m1[2]); | |
23 dst[3] = ADD(MUL(m1[3], m2[0]), MUL(m1[4], m2[3])); | |
24 dst[4] = ADD(MUL(m1[3], m2[1]), MUL(m1[4], m2[4])); | |
25 dst[5] = ADD(ADD(MUL(m1[3], m2[2]), MUL(m1[4], m2[5])), m1[5]); | |
1 | 26 } |
27 | |
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28 void matrix_mul(co_aix *m1, co_aix *m2, co_aix *dst) { |
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29 co_aix *_dst = dst; |
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30 co_aix fake_dst[6]; |
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31 |
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32 if(m1 == dst || m2 == dst) |
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33 _dst = fake_dst; |
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34 |
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35 mul_matrix(m1, m2, _dst); |
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36 |
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37 if(m1 == dst || m2 == dst) { |
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38 dst[0] = fake_dst[0]; |
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39 dst[1] = fake_dst[1]; |
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40 dst[2] = fake_dst[2]; |
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41 dst[3] = fake_dst[3]; |
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42 dst[4] = fake_dst[4]; |
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43 dst[5] = fake_dst[5]; |
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44 } |
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45 } |
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46 |
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47 void matrix_trans_pos(co_aix *matrix, co_aix *x, co_aix *y) { |
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48 co_aix nx, ny; |
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49 |
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50 nx = ADD(ADD(MUL(matrix[0], *x), |
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51 MUL(matrix[1], *y)), |
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52 matrix[2]); |
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53 ny = ADD(ADD(MUL(matrix[3], *x), |
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54 MUL(matrix[4], *y)), |
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55 matrix[5]); |
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56 *x = nx; |
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57 *y = ny; |
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58 } |
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59 |
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60 /*! \brief Compute aggregated transform matrix. |
2 | 61 * |
62 * Base on parent's aggregated matrix if it is existed, or use transform | |
63 * matrix as aggregated matrix. | |
64 */ | |
1 | 65 static void compute_transform_function(coord_t *visit) { |
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66 if(!coord_is_root(visit)) |
1 | 67 mul_matrix(visit->parent->aggr_matrix, |
68 visit->matrix, visit->aggr_matrix); | |
69 else | |
70 memcpy(visit->aggr_matrix, visit->matrix, sizeof(visit->matrix)); | |
71 } | |
72 | |
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73 void compute_aggr_of_coord(coord_t *coord) { |
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74 compute_transform_function(coord); |
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75 } |
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76 |
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77 /*! \brief Compute aggregated transform matrix for cached coord. |
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78 * |
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79 * \sa \ref img_cache |
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80 */ |
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81 static void compute_transform_function_cached(coord_t *visit) { |
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82 co_aix *p_matrix; |
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83 co_aix cache_p_matrix[6]; |
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84 co_aix cache_scale_x, cache_scale_y; |
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85 |
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86 if(!coord_is_root(visit)) { |
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87 p_matrix = coord_get_aggr_matrix(visit->parent); |
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88 cache_scale_x = |
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89 sqrtf(p_matrix[0] * p_matrix[0] + p_matrix[3] * p_matrix[3]); |
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90 cache_scale_y = |
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91 sqrtf(p_matrix[1] * p_matrix[1] + p_matrix[4] * p_matrix[4]); |
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92 cache_p_matrix[0] = cache_scale_x; |
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93 cache_p_matrix[1] = 0; |
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94 cache_p_matrix[2] = 0; |
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95 cache_p_matrix[3] = 0; |
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96 cache_p_matrix[4] = cache_scale_y; |
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97 cache_p_matrix[5] = 0; |
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98 mul_matrix(cache_p_matrix, visit->matrix, visit->aggr_matrix); |
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99 } else { |
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100 memcpy(visit->aggr_matrix, visit->matrix, sizeof(visit->matrix)); |
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101 } |
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102 } |
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103 |
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104 void compute_aggr_of_cached_coord(coord_t *coord) { |
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105 compute_transform_function_cached(coord); |
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106 } |
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107 |
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108 void |
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109 compute_aggr(coord_t *coord) { |
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110 if(coord->flags & COF_OWN_CANVAS) |
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111 compute_transform_function_cached(coord); |
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112 else |
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113 compute_transform_function(coord); |
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114 } |
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115 |
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116 void compute_reverse(co_aix *orig, co_aix *reverse) { |
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117 co_aix working[6]; |
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118 co_aix factor; |
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119 |
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120 #define VEC_MAC(src, factor, dst) \ |
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121 do { \ |
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122 (dst)[0] += (src)[0] * (factor); \ |
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123 (dst)[1] += (src)[1] * (factor); \ |
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124 (dst)[2] += (src)[2] * (factor); \ |
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125 } while(0) |
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126 |
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127 reverse[0] = 1; |
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128 reverse[1] = 0; |
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129 reverse[2] = 0; |
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130 reverse[3] = 0; |
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131 reverse[4] = 1; |
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132 reverse[5] = 0; |
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133 |
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134 memcpy(working, orig, sizeof(co_aix) * 6); |
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135 |
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136 factor = -working[3] / working[0]; |
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137 VEC_MAC(working, factor, working + 3); |
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138 VEC_MAC(reverse, factor, reverse + 3); |
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139 |
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140 factor = -working[1] / working[4]; |
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141 VEC_MAC(working + 3, factor, working); |
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142 VEC_MAC(reverse + 3, factor, reverse); |
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143 |
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144 reverse[2] = -working[2]; |
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145 reverse[5] = -working[5]; |
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146 |
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147 reverse[0] /= working[0]; |
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148 reverse[1] /= working[0]; |
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149 reverse[2] /= working[0]; |
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150 reverse[3] /= working[4]; |
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151 reverse[4] /= working[4]; |
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152 reverse[5] /= working[4]; |
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153 } |
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154 |
1 | 155 /*! \brief Update aggregate matrices of elements under a sub-tree. |
156 * | |
157 * A subtree is specified by the root of it. All elements in the subtree | |
158 * are effected by that changes of matrix of the subtree root. | |
314
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159 * |
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160 * \todo Remove update_aggr_matrix() since it is out of date and |
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161 * no one use it. |
1 | 162 */ |
163 void update_aggr_matrix(coord_t *start) { | |
164 coord_t *visit, *child, *next; | |
165 | |
166 compute_transform_function(start); | |
167 | |
168 visit = start; | |
169 while(visit) { | |
12 | 170 child = STAILQ_HEAD(visit->children); |
1 | 171 while(child) { |
172 compute_transform_function(child); | |
12 | 173 child = STAILQ_NEXT(coord_t, sibling, child); |
1 | 174 } |
175 | |
12 | 176 if(STAILQ_HEAD(visit->children)) |
177 visit = STAILQ_HEAD(visit->children); | |
178 else if(STAILQ_NEXT(coord_t, sibling, visit)) | |
179 visit = STAILQ_NEXT(coord_t, sibling, visit); | |
1 | 180 else { |
181 next = NULL; | |
182 while(visit->parent && visit->parent != start) { | |
183 visit = visit->parent; | |
12 | 184 if(STAILQ_NEXT(coord_t, sibling, visit)) { |
185 next = STAILQ_NEXT(coord_t, sibling, visit); | |
1 | 186 break; |
187 } | |
188 } | |
189 visit = next; | |
190 } | |
191 } | |
192 } | |
193 | |
12 | 194 /*! \brief Initialize a coord object. |
195 * | |
196 * The object is cleared and matrix was initialized to ID. | |
197 * The object is be a children of specified parent. | |
198 */ | |
1 | 199 void coord_init(coord_t *co, coord_t *parent) { |
200 memset(co, 0, sizeof(coord_t)); | |
201 if(parent) { | |
12 | 202 /* insert at tail of children list. */ |
1 | 203 co->parent = parent; |
12 | 204 STAILQ_INS_TAIL(parent->children, coord_t, sibling, co); |
1 | 205 } |
224
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206 mb_obj_init(co, MBO_COORD); |
1 | 207 co->matrix[0] = 1; |
208 co->matrix[4] = 1; | |
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209 co->aggr_matrix[0] = 1; |
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210 co->aggr_matrix[4] = 1; |
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211 co->cur_area = &co->areas[0]; |
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212 co->last_area = &co->areas[1]; |
1 | 213 } |
214 | |
2 | 215 void coord_trans_pos(coord_t *co, co_aix *x, co_aix *y) { |
216 co_aix nx, ny; | |
217 | |
218 nx = ADD(ADD(MUL(co->aggr_matrix[0], *x), | |
219 MUL(co->aggr_matrix[1], *y)), | |
220 co->aggr_matrix[2]); | |
221 ny = ADD(ADD(MUL(co->aggr_matrix[3], *x), | |
222 MUL(co->aggr_matrix[4], *y)), | |
223 co->aggr_matrix[5]); | |
224 *x = nx; | |
225 *y = ny; | |
226 } | |
227 | |
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228 co_aix coord_trans_size(coord_t *co, co_aix sz) { |
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229 co_aix x, y; |
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230 |
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231 x = MUL(co->aggr_matrix[0], sz); |
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232 y = MUL(co->aggr_matrix[3], sz); |
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233 |
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234 return sqrt(x * x + y * y); |
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235 } |
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236 |
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237 /*! |
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238 * \note Coords, marked with COF_SKIP_TRIVAL (for temporary), and |
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239 * descendants of them will not be trivaled and the flag with be removed |
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240 * after skipping them. |
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241 */ |
13 | 242 coord_t *preorder_coord_subtree(coord_t *root, coord_t *last) { |
151
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243 coord_t *next = NULL; |
12 | 244 |
138
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245 ASSERT(last != NULL); |
12 | 246 |
151
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247 if((!(last->flags & COF_SKIP_TRIVAL)) && |
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248 STAILQ_HEAD(last->children)) { |
12 | 249 next = STAILQ_HEAD(last->children); |
151
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250 if(!(next->flags & COF_SKIP_TRIVAL)) |
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251 return next; |
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252 } else { |
12 | 253 next = last; |
151
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254 } |
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255 |
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256 do { |
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257 next->flags &= ~COF_SKIP_TRIVAL; |
13 | 258 while(next != root && STAILQ_NEXT(coord_t, sibling, next) == NULL) |
12 | 259 next = next->parent; |
13 | 260 if(next == root) |
151
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261 return NULL; |
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262 next = STAILQ_NEXT(coord_t, sibling, next); |
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263 } while(next->flags & COF_SKIP_TRIVAL); |
12 | 264 |
265 return next; | |
266 } | |
267 | |
138
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268 coord_t *postorder_coord_subtree(coord_t *root, coord_t *last) { |
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269 coord_t *next; |
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270 |
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271 if(root == last) |
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272 return NULL; |
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273 |
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274 if(last == NULL) { |
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275 /* Go most left leaf. */ |
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276 next = root; |
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277 while(STAILQ_HEAD(next->children)) |
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278 next = STAILQ_HEAD(next->children); |
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279 return next; |
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280 } |
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281 |
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282 next = last; |
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283 if(STAILQ_NEXT(coord_t, sibling, next) == NULL) /* most right */ |
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284 return next->parent; |
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285 |
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286 /* Go most left leaf of right sibling sub-tree. */ |
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287 next = STAILQ_NEXT(coord_t, sibling, next); |
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288 while(STAILQ_HEAD(next->children)) |
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289 next = STAILQ_HEAD(next->children); |
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290 |
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291 return next; |
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292 } |
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293 |
1 | 294 #ifdef UNITTEST |
295 | |
296 #include <CUnit/Basic.h> | |
297 | |
298 void test_update_aggr_matrix(void) { | |
299 coord_t elms[6]; | |
2 | 300 co_aix x, y; |
1 | 301 |
302 coord_init(elms, NULL); | |
303 coord_init(elms + 1, elms); | |
304 coord_init(elms + 2, elms); | |
305 coord_init(elms + 3, elms + 1); | |
306 coord_init(elms + 4, elms + 1); | |
307 coord_init(elms + 5, elms + 2); | |
308 | |
309 /* | 2 -1 0 | | |
310 * | 0 1 0 | | |
311 * | 0 0 1 | | |
312 */ | |
313 elms[0].matrix[0] = 2; | |
314 elms[0].matrix[1] = -1; | |
315 | |
316 /* | 1 3 0 | | |
317 * | 5 1 0 | | |
318 * | 0 0 1 | | |
319 */ | |
320 elms[1].matrix[1] = 3; | |
321 elms[1].matrix[3] = 5; | |
322 | |
323 update_aggr_matrix(elms); | |
324 | |
325 /* | -3 5 0 | | |
326 * | 5 1 0 | | |
327 * | 0 0 1 | | |
328 */ | |
329 CU_ASSERT(elms[3].aggr_matrix[0] == -3); | |
330 CU_ASSERT(elms[3].aggr_matrix[1] == 5); | |
331 CU_ASSERT(elms[3].aggr_matrix[2] == 0); | |
332 CU_ASSERT(elms[3].aggr_matrix[3] == 5); | |
333 CU_ASSERT(elms[3].aggr_matrix[4] == 1); | |
334 CU_ASSERT(elms[3].aggr_matrix[5] == 0); | |
335 | |
336 CU_ASSERT(elms[4].aggr_matrix[0] == -3); | |
337 CU_ASSERT(elms[4].aggr_matrix[1] == 5); | |
338 CU_ASSERT(elms[4].aggr_matrix[2] == 0); | |
339 CU_ASSERT(elms[4].aggr_matrix[3] == 5); | |
340 CU_ASSERT(elms[4].aggr_matrix[4] == 1); | |
341 CU_ASSERT(elms[4].aggr_matrix[5] == 0); | |
342 | |
343 CU_ASSERT(elms[5].aggr_matrix[0] == 2); | |
344 CU_ASSERT(elms[5].aggr_matrix[1] == -1); | |
345 CU_ASSERT(elms[5].aggr_matrix[2] == 0); | |
346 CU_ASSERT(elms[5].aggr_matrix[3] == 0); | |
347 CU_ASSERT(elms[5].aggr_matrix[4] == 1); | |
348 CU_ASSERT(elms[5].aggr_matrix[5] == 0); | |
2 | 349 |
350 x = 50; | |
351 y = 99; | |
352 coord_trans_pos(elms + 5, &x, &y); | |
353 CU_ASSERT(x == 1); | |
354 CU_ASSERT(y == 99); | |
1 | 355 } |
356 | |
13 | 357 void test_preorder_coord_subtree(void) { |
12 | 358 coord_t elms[6]; |
359 coord_t *last; | |
360 | |
361 coord_init(elms, NULL); | |
362 coord_init(elms + 1, elms); | |
363 coord_init(elms + 2, elms); | |
364 coord_init(elms + 3, elms + 1); | |
365 coord_init(elms + 4, elms + 1); | |
366 coord_init(elms + 5, elms + 2); | |
367 | |
368 last = elms; | |
13 | 369 last = preorder_coord_subtree(elms, last); |
12 | 370 CU_ASSERT(last == elms + 1); |
13 | 371 last = preorder_coord_subtree(elms, last); |
12 | 372 CU_ASSERT(last == elms + 3); |
13 | 373 last = preorder_coord_subtree(elms, last); |
12 | 374 CU_ASSERT(last == elms + 4); |
13 | 375 last = preorder_coord_subtree(elms, last); |
12 | 376 CU_ASSERT(last == elms + 2); |
13 | 377 last = preorder_coord_subtree(elms, last); |
12 | 378 CU_ASSERT(last == elms + 5); |
13 | 379 last = preorder_coord_subtree(elms, last); |
12 | 380 CU_ASSERT(last == NULL); |
381 } | |
382 | |
1 | 383 CU_pSuite get_coord_suite(void) { |
384 CU_pSuite suite; | |
385 | |
386 suite = CU_add_suite("Suite_coord", NULL, NULL); | |
387 CU_ADD_TEST(suite, test_update_aggr_matrix); | |
13 | 388 CU_ADD_TEST(suite, test_preorder_coord_subtree); |
1 | 389 |
390 return suite; | |
391 } | |
392 | |
393 #endif |