| 1 | // Aseprite Document Library |
| 2 | // Copyright (c) 2001-2015 David Capello |
| 3 | // |
| 4 | // This file is released under the terms of the MIT license. |
| 5 | // Read LICENSE.txt for more information. |
| 6 | |
| 7 | #ifdef HAVE_CONFIG_H |
| 8 | #include "config.h" |
| 9 | #endif |
| 10 | |
| 11 | #include "doc/mask_boundaries.h" |
| 12 | |
| 13 | #include "doc/image_impl.h" |
| 14 | |
| 15 | namespace doc { |
| 16 | |
| 17 | void MaskBoundaries::reset() |
| 18 | { |
| 19 | m_segs.clear(); |
| 20 | if (!m_path.isEmpty()) |
| 21 | m_path.rewind(); |
| 22 | } |
| 23 | |
| 24 | void MaskBoundaries::regen(const Image* bitmap) |
| 25 | { |
| 26 | reset(); |
| 27 | |
| 28 | int x, y, w = bitmap->width(), h = bitmap->height(); |
| 29 | |
| 30 | const LockImageBits<BitmapTraits> bits(bitmap); |
| 31 | auto it = bits.begin(); // Current pixel iterator |
| 32 | #if _DEBUG |
| 33 | auto prevIt = bits.begin(); // Previous row iterator (same X pos) |
| 34 | #endif |
| 35 | |
| 36 | // Vertical segments being expanded from the previous row. |
| 37 | std::vector<int> vertSegs(w+1, -1); |
| 38 | |
| 39 | // Horizontal segment being expanded from the previous column. |
| 40 | int horzSeg; |
| 41 | |
| 42 | #define new_hseg(open) { \ |
| 43 | m_segs.push_back(Segment(open, gfx::Rect(x, y, 1, 0))); \ |
| 44 | horzSeg = int(m_segs.size()-1); \ |
| 45 | } |
| 46 | #define new_vseg(open) { \ |
| 47 | m_segs.push_back(Segment(open, gfx::Rect(x, y, 0, 1))); \ |
| 48 | vertSegs[x] = int(m_segs.size()-1); \ |
| 49 | } |
| 50 | #define expand_hseg() { \ |
| 51 | ASSERT(hseg); \ |
| 52 | ++hseg->m_bounds.w; \ |
| 53 | } |
| 54 | #define expand_vseg() { \ |
| 55 | ASSERT(vseg); \ |
| 56 | ++vseg->m_bounds.h; \ |
| 57 | } |
| 58 | #define stop_expanding_hseg() { \ |
| 59 | horzSeg = -1; \ |
| 60 | } |
| 61 | #define stop_expanding_vseg() { \ |
| 62 | vertSegs[x] = -1; \ |
| 63 | } |
| 64 | |
| 65 | for (y=0; y<=h; ++y) { |
| 66 | bool prevColor = false; // Previous color (X-1) same Y row |
| 67 | horzSeg = -1; |
| 68 | |
| 69 | for (x=0; x<=w; ++x) { |
| 70 | bool color = (x < w && y < h && *it ? true: false); |
| 71 | #if _DEBUG |
| 72 | bool prevRowColor = (x < w && y > 0 && *prevIt ? true: false); |
| 73 | #endif |
| 74 | Segment* hseg = (horzSeg >= 0 ? &m_segs[horzSeg]: nullptr); |
| 75 | Segment* vseg = (vertSegs[x] >= 0 ? &m_segs[vertSegs[x]]: nullptr); |
| 76 | |
| 77 | // |
| 78 | // - - |
| 79 | // |
| 80 | // - 1 |
| 81 | // |
| 82 | if (color) { |
| 83 | // |
| 84 | // - | - |
| 85 | // o |
| 86 | // - 1 |
| 87 | // |
| 88 | if (vseg) { |
| 89 | // |
| 90 | // 0 | 1 |
| 91 | // o |
| 92 | // - 1 |
| 93 | // |
| 94 | if (vseg->open()) { |
| 95 | ASSERT(prevRowColor); |
| 96 | |
| 97 | // |
| 98 | // 0 | 1 |
| 99 | // --x |
| 100 | // 1 1 |
| 101 | // |
| 102 | if (hseg) { |
| 103 | ASSERT(hseg->open()); |
| 104 | ASSERT(prevColor); |
| 105 | stop_expanding_hseg(); |
| 106 | stop_expanding_vseg(); |
| 107 | } |
| 108 | // |
| 109 | // 0 | 1 |
| 110 | // | |
| 111 | // 0 | 1 |
| 112 | // o |
| 113 | else { |
| 114 | ASSERT(!prevColor); |
| 115 | expand_vseg(); |
| 116 | } |
| 117 | } |
| 118 | // |
| 119 | // 1 | 0 |
| 120 | // x--o |
| 121 | // - 1 |
| 122 | // |
| 123 | else { |
| 124 | ASSERT(!prevRowColor); |
| 125 | |
| 126 | // |
| 127 | // 1 | 0 |
| 128 | // --x--o |
| 129 | // 0 | 1 |
| 130 | // o |
| 131 | if (hseg) { |
| 132 | ASSERT(!prevColor); |
| 133 | ASSERT(!hseg->open()); |
| 134 | new_hseg(true); |
| 135 | new_vseg(true); |
| 136 | } |
| 137 | // |
| 138 | // 1 | 0 |
| 139 | // x--o |
| 140 | // 1 1 |
| 141 | // |
| 142 | else { |
| 143 | ASSERT(prevColor); |
| 144 | new_hseg(true); |
| 145 | stop_expanding_vseg(); |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | // |
| 150 | // - - (there is no vertical segment in this row, both colors are equal) |
| 151 | // |
| 152 | // - 1 |
| 153 | // |
| 154 | else { |
| 155 | // |
| 156 | // - - |
| 157 | // --o |
| 158 | // - 1 |
| 159 | // |
| 160 | if (hseg) { |
| 161 | // |
| 162 | // 0 0 |
| 163 | // -----o |
| 164 | // 1 1 |
| 165 | // |
| 166 | if (hseg->open()) { |
| 167 | ASSERT(prevColor); |
| 168 | expand_hseg(); |
| 169 | } |
| 170 | // |
| 171 | // 1 1 |
| 172 | // --x |
| 173 | // 0 | 1 |
| 174 | // o |
| 175 | else { |
| 176 | ASSERT(!prevColor); |
| 177 | stop_expanding_hseg(); |
| 178 | new_vseg(true); |
| 179 | } |
| 180 | } |
| 181 | else { |
| 182 | // |
| 183 | // 1 1 |
| 184 | // |
| 185 | // 1 1 |
| 186 | // |
| 187 | if (prevColor) { |
| 188 | // Do nothing, we are inside boundaries |
| 189 | } |
| 190 | // |
| 191 | // 0 0 |
| 192 | // --o |
| 193 | // 0 | 1 |
| 194 | // o |
| 195 | else { |
| 196 | // First two segments of a corner |
| 197 | new_hseg(true); |
| 198 | new_vseg(true); |
| 199 | } |
| 200 | } |
| 201 | } |
| 202 | } |
| 203 | // |
| 204 | // - - |
| 205 | // |
| 206 | // - 0 |
| 207 | // |
| 208 | else { |
| 209 | // |
| 210 | // - | - |
| 211 | // o |
| 212 | // - 0 |
| 213 | // |
| 214 | if (vseg) { |
| 215 | // |
| 216 | // 0 | 1 |
| 217 | // o |
| 218 | // - 0 |
| 219 | // |
| 220 | if (vseg->open()) { |
| 221 | ASSERT(prevRowColor); |
| 222 | |
| 223 | // |
| 224 | // 0 | 1 |
| 225 | // --x--o |
| 226 | // 1 | 0 |
| 227 | // o |
| 228 | if (hseg) { |
| 229 | ASSERT(hseg->open()); |
| 230 | ASSERT(prevColor); |
| 231 | new_hseg(false); |
| 232 | new_vseg(false); |
| 233 | } |
| 234 | // |
| 235 | // 0 | 1 |
| 236 | // x--o |
| 237 | // 0 0 |
| 238 | // |
| 239 | else { |
| 240 | ASSERT(!prevColor); |
| 241 | new_hseg(false); |
| 242 | stop_expanding_vseg(); |
| 243 | } |
| 244 | } |
| 245 | // |
| 246 | // 1 | 0 |
| 247 | // o |
| 248 | // - 0 |
| 249 | // |
| 250 | else { |
| 251 | ASSERT(!prevRowColor); |
| 252 | |
| 253 | // |
| 254 | // 1 | 0 |
| 255 | // --x |
| 256 | // 0 0 |
| 257 | // |
| 258 | if (hseg) { |
| 259 | ASSERT(!prevColor); |
| 260 | stop_expanding_hseg(); |
| 261 | stop_expanding_vseg(); |
| 262 | } |
| 263 | // |
| 264 | // 1 | 0 |
| 265 | // | |
| 266 | // 1 | 0 |
| 267 | // o |
| 268 | else { |
| 269 | ASSERT(prevColor); |
| 270 | expand_vseg(); |
| 271 | } |
| 272 | } |
| 273 | } |
| 274 | // |
| 275 | // - - (there is no vertical segment in this row, both colors are equal) |
| 276 | // |
| 277 | // - 0 |
| 278 | // |
| 279 | else { |
| 280 | // |
| 281 | // - - |
| 282 | // --o |
| 283 | // - 0 |
| 284 | // |
| 285 | if (hseg) { |
| 286 | // |
| 287 | // 0 0 |
| 288 | // --x |
| 289 | // 1 | 0 |
| 290 | // o |
| 291 | if (hseg->open()) { |
| 292 | ASSERT(prevColor); |
| 293 | stop_expanding_hseg(); |
| 294 | new_vseg(false); |
| 295 | } |
| 296 | // |
| 297 | // 1 1 |
| 298 | // -----o |
| 299 | // 0 0 |
| 300 | // |
| 301 | else { |
| 302 | ASSERT(!prevColor); |
| 303 | expand_hseg(); |
| 304 | } |
| 305 | } |
| 306 | else { |
| 307 | // |
| 308 | // 1 1 |
| 309 | // --o |
| 310 | // 1 | 0 |
| 311 | // o |
| 312 | if (prevColor) { |
| 313 | new_hseg(false); |
| 314 | new_vseg(false); |
| 315 | } |
| 316 | // |
| 317 | // 0 0 |
| 318 | // |
| 319 | // 0 0 |
| 320 | // |
| 321 | else { |
| 322 | // Do nothing, we are inside boundaries |
| 323 | } |
| 324 | } |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | prevColor = color; |
| 329 | if (x < w) { |
| 330 | #if _DEBUG |
| 331 | if (y > 0) ++prevIt; |
| 332 | #endif |
| 333 | if (y < h) ++it; |
| 334 | } |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | ASSERT(it == bits.end()); |
| 339 | ASSERT(prevIt == bits.end()); |
| 340 | } |
| 341 | |
| 342 | void MaskBoundaries::offset(int x, int y) |
| 343 | { |
| 344 | for (Segment& seg : m_segs) |
| 345 | seg.offset(x, y); |
| 346 | |
| 347 | m_path.offset(x, y); |
| 348 | } |
| 349 | |
| 350 | void MaskBoundaries::createPathIfNeeeded() |
| 351 | { |
| 352 | if (!m_path.isEmpty()) |
| 353 | return; |
| 354 | |
| 355 | for (const auto& seg : m_segs) { |
| 356 | gfx::Rect rc = seg.bounds(); |
| 357 | m_path.moveTo(rc.x, rc.y); |
| 358 | |
| 359 | if (seg.vertical()) |
| 360 | m_path.lineTo(rc.x, rc.y2()); |
| 361 | else |
| 362 | m_path.lineTo(rc.x2(), rc.y); |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | } // namespace doc |
| 367 | |