Draws a line into the passed in bitmap
| 273 | } |
| 274 | // Draws a line into the passed in bitmap |
| 275 | void DrawProceduralLine(int x1, int y1, int x2, int y2, uint8_t color) { |
| 276 | int DY, DX; |
| 277 | int i, x, y, yinc = 1, xinc = 1, error_term; |
| 278 | |
| 279 | uint8_t *surface_ptr = ProcDestData; |
| 280 | |
| 281 | int xmask = PROC_SIZE - 1; |
| 282 | int ymask = PROC_SIZE - 1; |
| 283 | |
| 284 | // Check to see if our x coords are reversed |
| 285 | if (x1 > x2) { |
| 286 | std::swap(x1, x2); |
| 287 | std::swap(y1, y2); |
| 288 | } |
| 289 | DX = x2 - x1; |
| 290 | DY = y2 - y1; |
| 291 | if (DX < 0) { |
| 292 | xinc = -1; |
| 293 | DX = -DX; |
| 294 | } |
| 295 | if (DY < 0) { |
| 296 | yinc = -1; |
| 297 | DY = -DY; |
| 298 | } |
| 299 | if (DX >= DY) // X is greater than y |
| 300 | { |
| 301 | error_term = 0; |
| 302 | x = x1 & xmask; |
| 303 | y = y1 & ymask; |
| 304 | surface_ptr += y * PROC_SIZE; |
| 305 | for (i = 0; i < DX; i++) { |
| 306 | |
| 307 | *(surface_ptr + x) = color; |
| 308 | x += xinc; |
| 309 | x &= xmask; |
| 310 | error_term += DY; |
| 311 | if (error_term >= DX) { |
| 312 | y += yinc; |
| 313 | y &= ymask; |
| 314 | surface_ptr = ProcDestData + (y * PROC_SIZE); |
| 315 | error_term -= DX; |
| 316 | } |
| 317 | } |
| 318 | } else { |
| 319 | error_term = 0; |
| 320 | x = x1 & xmask; |
| 321 | y = y1 & ymask; |
| 322 | surface_ptr += y * PROC_SIZE; |
| 323 | |
| 324 | for (i = 0; i < DY; i++) { |
| 325 | *(surface_ptr + x) = color; |
| 326 | y += yinc; |
| 327 | y &= ymask; |
| 328 | error_term += DX; |
| 329 | surface_ptr = ProcDestData + (y * PROC_SIZE); |
| 330 | if (error_term >= DY) { |
| 331 | x += xinc; |
| 332 | x &= xmask; |