1 /* 2 * Copyright 2018 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can 5 * be found in the LICENSE file. 6 * 7 */ 8 9 // 10 // 11 // 12 13 #pragma once 14 15 // 16 // 17 // 18 19 #include <stdint.h> 20 21 // 22 // 23 // 24 25 struct ts_transform_stack; 26 27 // 28 // 29 // 30 31 #if 1 32 typedef float ts_transform_float_t; 33 #define TS_TRANSFORM_FLOAT_SUFFIX f 34 #else 35 typedef double ts_transform_float_t; 36 #define TS_TRANSFORM_FLOAT_SUFFIX 37 #endif 38 39 // 40 // 41 // 42 43 typedef uint64_t ts_transform_weakref_t; 44 45 #define TS_TRANSFORM_WEAKREF_INVALID UINT64_MAX; 46 47 // 48 // 49 // 50 51 typedef enum ts_transform_type 52 { 53 TS_TRANSFORM_TYPE_INVALID, 54 TS_TRANSFORM_TYPE_AFFINE, 55 TS_TRANSFORM_TYPE_PROJECTIVE 56 } ts_transform_type_e; 57 58 // 59 // 60 // 61 62 struct ts_transform_stack * 63 ts_transform_stack_create(const uint32_t size); 64 65 void 66 ts_transform_stack_release(struct ts_transform_stack * const ts); 67 68 // 69 // 70 // 71 72 uint32_t 73 ts_transform_stack_save(struct ts_transform_stack * const ts); 74 75 void 76 ts_transform_stack_restore(struct ts_transform_stack * const ts, uint32_t const restore); 77 78 // 79 // 80 // 81 82 ts_transform_float_t * 83 ts_transform_stack_top_transform(struct ts_transform_stack * const ts); 84 85 ts_transform_weakref_t * 86 ts_transform_stack_top_weakref(struct ts_transform_stack * const ts); 87 88 // 89 // 90 // 91 92 void 93 ts_transform_stack_dup(struct ts_transform_stack * const ts); 94 95 void 96 ts_transform_stack_drop(struct ts_transform_stack * const ts); 97 98 // 99 // 100 // 101 102 void 103 ts_transform_stack_transform_xy(struct ts_transform_stack * const ts, 104 ts_transform_float_t const x, 105 ts_transform_float_t const y, 106 ts_transform_float_t * const xp, 107 ts_transform_float_t * const yp); 108 109 // 110 // 111 // 112 113 void 114 ts_transform_stack_push_matrix(struct ts_transform_stack * const ts, 115 ts_transform_float_t const sx, 116 ts_transform_float_t const shx, 117 ts_transform_float_t const tx, 118 ts_transform_float_t const shy, 119 ts_transform_float_t const sy, 120 ts_transform_float_t const ty, 121 ts_transform_float_t const w0, 122 ts_transform_float_t const w1, 123 ts_transform_float_t const w2); 124 125 void 126 ts_transform_stack_push_identity(struct ts_transform_stack * const ts); 127 128 void 129 ts_transform_stack_push_affine(struct ts_transform_stack * const ts, 130 ts_transform_float_t const sx, 131 ts_transform_float_t const shx, 132 ts_transform_float_t const tx, 133 ts_transform_float_t const shy, 134 ts_transform_float_t const sy, 135 ts_transform_float_t const ty); 136 137 void 138 ts_transform_stack_push_translate(struct ts_transform_stack * const ts, 139 ts_transform_float_t const tx, 140 ts_transform_float_t const ty); 141 142 void 143 ts_transform_stack_push_scale(struct ts_transform_stack * const ts, 144 ts_transform_float_t const sx, 145 ts_transform_float_t const sy); 146 147 void 148 ts_transform_stack_push_shear(struct ts_transform_stack * const ts, 149 ts_transform_float_t const shx, 150 ts_transform_float_t const shy); 151 152 153 void 154 ts_transform_stack_push_skew_x(struct ts_transform_stack * const ts, 155 ts_transform_float_t const theta); 156 157 void 158 ts_transform_stack_push_skew_y(struct ts_transform_stack * const ts, 159 ts_transform_float_t const theta); 160 161 void 162 ts_transform_stack_push_rotate(struct ts_transform_stack * const ts, 163 ts_transform_float_t const theta); 164 165 void 166 ts_transform_stack_push_rotate_xy2(struct ts_transform_stack * const ts, 167 ts_transform_float_t const theta, 168 ts_transform_float_t const cx, 169 ts_transform_float_t const cy, 170 ts_transform_float_t const tx, 171 ts_transform_float_t const ty); 172 173 void 174 ts_transform_stack_push_rotate_xy(struct ts_transform_stack * const ts, 175 ts_transform_float_t const theta, 176 ts_transform_float_t const cx, 177 ts_transform_float_t const cy); 178 179 void 180 ts_transform_stack_push_rotate_scale_xy(struct ts_transform_stack * const ts, 181 ts_transform_float_t const theta, 182 ts_transform_float_t const sx, 183 ts_transform_float_t const sy, 184 ts_transform_float_t const cx, 185 ts_transform_float_t const cy); 186 // 187 // Quadrilateral coordinates are ts_transform_float_t2 structs: 188 // 189 // float2[4] = { xy0, xy1, xy2, xy3 } 190 // 191 // -or- 192 // 193 // float[8] = { x0, y0, x1, y1, x2, y2, x3, y3 }; 194 // 195 196 ts_transform_type_e 197 ts_transform_stack_push_quad_to_unit(struct ts_transform_stack * const ts, 198 ts_transform_float_t const quad[8]); 199 200 ts_transform_type_e 201 ts_transform_stack_push_unit_to_quad(struct ts_transform_stack * const ts, 202 ts_transform_float_t const quad[8]); 203 204 ts_transform_type_e 205 ts_transform_stack_push_quad_to_quad(struct ts_transform_stack * const ts, 206 ts_transform_float_t const quad_src[8], 207 ts_transform_float_t const quad_dst[8]); 208 209 ts_transform_type_e 210 ts_transform_stack_push_rect_to_quad(struct ts_transform_stack * const ts, 211 ts_transform_float_t const x0, 212 ts_transform_float_t const y0, 213 ts_transform_float_t const x1, 214 ts_transform_float_t const y1, 215 ts_transform_float_t const quad_dst[8]); 216 217 // 218 // The second matrix on the stack (TOS[-1]) is post-multiplied by the 219 // top matrix on the stack (TOS[0]). 220 // 221 // The result replaces TOS[0] and TOS[-1] is unmodified. 222 // 223 // The stack effect of concat is: 224 // 225 // | B | | A*B | 226 // | A | | A | 227 // | . | => | . | 228 // | . | | . | 229 // | . | | . | 230 // 231 232 void 233 ts_transform_stack_concat(struct ts_transform_stack * const ts); 234 235 // 236 // The second matrix on the stack (TOS[-1]) is post-multiplied by the 237 // top matrix on the stack (TOS[0]). 238 // 239 // The result replaces both matrices. 240 // 241 // The stack effect of multiply is: 242 // 243 // | B | | A*B | 244 // | A | | . | 245 // | . | => | . | 246 // | . | | . | 247 // | . | | . | 248 // 249 250 void 251 ts_transform_stack_multiply(struct ts_transform_stack * const ts); 252 253 // 254 // 255 // 256
