| 285 | } |
| 286 | |
| 287 | static void |
| 288 | build_bmih(UNALIGNED_POINTER BITMAPINFOHEADER* pbmih) |
| 289 | { |
| 290 | uint16_t cClrBits; |
| 291 | int w, h; |
| 292 | pbmih->biSize = lelong(sizeof(bmp.bmih)); |
| 293 | pbmih->biWidth = lelong(w = max_x); |
| 294 | pbmih->biHeight = lelong(h = max_y); |
| 295 | pbmih->biPlanes = leshort(1); |
| 296 | pbmih->biBitCount = leshort(8); |
| 297 | cClrBits = 8; |
| 298 | if (cClrBits == 1) |
| 299 | cClrBits = 1; |
| 300 | else if (cClrBits <= 4) |
| 301 | cClrBits = 4; |
| 302 | else if (cClrBits <= 8) |
| 303 | cClrBits = 8; |
| 304 | else if (cClrBits <= 16) |
| 305 | cClrBits = 16; |
| 306 | else if (cClrBits <= 24) |
| 307 | cClrBits = 24; |
| 308 | else |
| 309 | cClrBits = 32; |
| 310 | pbmih->biCompression = lelong(BI_RGB); |
| 311 | pbmih->biXPelsPerMeter = lelong(0); |
| 312 | pbmih->biYPelsPerMeter = lelong(0); |
| 313 | #if (TILE_X == 32) |
| 314 | if (cClrBits < 24) |
| 315 | pbmih->biClrUsed = lelong(1 << cClrBits); |
| 316 | #else |
| 317 | pbmih->biClrUsed = lelong(RGBQUAD_COUNT); |
| 318 | #endif |
| 319 | pbmih->biSizeImage = lelong(((w * cClrBits + 31) & ~31) / 8 * h); |
| 320 | pbmih->biClrImportant = (uint32_t) 0; |
| 321 | } |
| 322 | |
| 323 | static void |
| 324 | build_bmptile(pixel(*pixels)[TILE_X]) |