| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: imagbmp.cpp |
| 3 | // Purpose: wxImage BMP handler |
| 4 | // Author: Robert Roebling |
| 5 | // RCS-ID: $Id$ |
| 6 | // Copyright: (c) Robert Roebling |
| 7 | // Licence: wxWindows licence |
| 8 | ///////////////////////////////////////////////////////////////////////////// |
| 9 | |
| 10 | /* |
| 11 | We don't put pragma implement in this file because it is already present in |
| 12 | src/common/image.cpp |
| 13 | */ |
| 14 | |
| 15 | // For compilers that support precompilation, includes "wx.h". |
| 16 | #include "wx/wxprec.h" |
| 17 | |
| 18 | #ifdef __BORLANDC__ |
| 19 | #pragma hdrstop |
| 20 | #endif |
| 21 | |
| 22 | #include "wx/image.h" |
| 23 | #include "wx/bitmap.h" |
| 24 | #include "wx/debug.h" |
| 25 | #include "wx/log.h" |
| 26 | #include "wx/app.h" |
| 27 | #include "wx/filefn.h" |
| 28 | #include "wx/wfstream.h" |
| 29 | #include "wx/intl.h" |
| 30 | #include "wx/module.h" |
| 31 | |
| 32 | // For memcpy |
| 33 | #include <string.h> |
| 34 | |
| 35 | #ifdef __SALFORDC__ |
| 36 | #ifdef FAR |
| 37 | #undef FAR |
| 38 | #endif |
| 39 | #endif |
| 40 | |
| 41 | #ifdef __WXMSW__ |
| 42 | #include <windows.h> |
| 43 | #endif |
| 44 | |
| 45 | //----------------------------------------------------------------------------- |
| 46 | // wxBMPHandler |
| 47 | //----------------------------------------------------------------------------- |
| 48 | |
| 49 | #if !USE_SHARED_LIBRARIES |
| 50 | IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler) |
| 51 | #endif |
| 52 | |
| 53 | #if wxUSE_STREAMS |
| 54 | |
| 55 | #ifndef BI_RGB |
| 56 | #define BI_RGB 0 |
| 57 | #define BI_RLE8 1 |
| 58 | #define BI_RLE4 2 |
| 59 | #endif |
| 60 | |
| 61 | #ifndef BI_BITFIELDS |
| 62 | #define BI_BITFIELDS 3 |
| 63 | #endif |
| 64 | |
| 65 | #define poffset (line * width * 3 + column * 3) |
| 66 | |
| 67 | bool wxBMPHandler::LoadFile( wxImage *image, wxInputStream& stream ) |
| 68 | { |
| 69 | int rshift = 0, gshift = 0, bshift = 0; |
| 70 | wxUint8 aByte; |
| 71 | wxUint16 aWord; |
| 72 | wxInt32 dbuf[4], aDword, |
| 73 | rmask = 0, gmask = 0, bmask = 0; |
| 74 | wxInt8 bbuf[4]; |
| 75 | struct _cmap { |
| 76 | unsigned char r, g, b; |
| 77 | } *cmap = NULL; |
| 78 | |
| 79 | off_t start_offset = stream.TellI(); |
| 80 | |
| 81 | image->Destroy(); |
| 82 | |
| 83 | /* |
| 84 | * Read the BMP header |
| 85 | */ |
| 86 | |
| 87 | stream.Read( &bbuf, 2 ); |
| 88 | stream.Read( dbuf, 4 * 4 ); |
| 89 | |
| 90 | #if 0 // unused |
| 91 | wxInt32 size = wxINT32_SWAP_ON_BE( dbuf[0] ); |
| 92 | #endif |
| 93 | wxInt32 offset = wxINT32_SWAP_ON_BE( dbuf[2] ); |
| 94 | |
| 95 | stream.Read(dbuf, 4 * 2); |
| 96 | int width = (int)wxINT32_SWAP_ON_BE( dbuf[0] ); |
| 97 | int height = (int)wxINT32_SWAP_ON_BE( dbuf[1] ); |
| 98 | if (width > 32767) |
| 99 | { |
| 100 | wxLogError( _T("Image width > 32767 pixels for file.") ); |
| 101 | return FALSE; |
| 102 | } |
| 103 | if (height > 32767) |
| 104 | { |
| 105 | wxLogError( _T("Image height > 32767 pixels for file.") ); |
| 106 | return FALSE; |
| 107 | } |
| 108 | |
| 109 | stream.Read( &aWord, 2 ); |
| 110 | /* |
| 111 | TODO |
| 112 | int planes = (int)wxUINT16_SWAP_ON_BE( aWord ); |
| 113 | */ |
| 114 | stream.Read( &aWord, 2 ); |
| 115 | int bpp = (int)wxUINT16_SWAP_ON_BE( aWord ); |
| 116 | if (bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32) |
| 117 | { |
| 118 | wxLogError( _T("unknown bitdepth in file.") ); |
| 119 | return FALSE; |
| 120 | } |
| 121 | |
| 122 | stream.Read( dbuf, 4 * 4 ); |
| 123 | int comp = (int)wxINT32_SWAP_ON_BE( dbuf[0] ); |
| 124 | if (comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 && comp != BI_BITFIELDS) |
| 125 | { |
| 126 | wxLogError( _T("unknown encoding in Windows BMP file.") ); |
| 127 | return FALSE; |
| 128 | } |
| 129 | |
| 130 | stream.Read( dbuf, 4 * 2 ); |
| 131 | int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] ); |
| 132 | if (ncolors == 0) |
| 133 | ncolors = 1 << bpp; |
| 134 | /* some more sanity checks */ |
| 135 | if (((comp == BI_RLE4) && (bpp != 4)) || |
| 136 | ((comp == BI_RLE8) && (bpp != 8)) || |
| 137 | ((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32))) |
| 138 | { |
| 139 | wxLogError( _T("encoding of BMP doesn't match bitdepth.") ); |
| 140 | return FALSE; |
| 141 | } |
| 142 | if (bpp < 16) |
| 143 | { |
| 144 | cmap = (struct _cmap *)malloc(sizeof(struct _cmap) * ncolors); |
| 145 | if (!cmap) |
| 146 | { |
| 147 | wxLogError( _T("Cannot allocate RAM for color map in BMP file.") ); |
| 148 | return FALSE; |
| 149 | } |
| 150 | } |
| 151 | else |
| 152 | cmap = NULL; |
| 153 | |
| 154 | image->Create( width, height ); |
| 155 | unsigned char *ptr = image->GetData(); |
| 156 | if (!ptr) |
| 157 | { |
| 158 | wxLogError( _T("Cannot allocate RAM for RGB data in file.") ); |
| 159 | if (cmap) |
| 160 | free(cmap); |
| 161 | return FALSE; |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Reading the palette, if it exists. |
| 166 | */ |
| 167 | if (bpp < 16 && ncolors != 0) |
| 168 | { |
| 169 | for (int j = 0; j < ncolors; j++) |
| 170 | { |
| 171 | stream.Read( bbuf, 4 ); |
| 172 | cmap[j].b = bbuf[0]; |
| 173 | cmap[j].g = bbuf[1]; |
| 174 | cmap[j].r = bbuf[2]; |
| 175 | } |
| 176 | } |
| 177 | else if (bpp == 16 || bpp == 32) |
| 178 | { |
| 179 | if (comp == BI_BITFIELDS) |
| 180 | { |
| 181 | int bit = 0; |
| 182 | stream.Read( dbuf, 4 * 3 ); |
| 183 | bmask = wxINT32_SWAP_ON_BE( dbuf[0] ); |
| 184 | gmask = wxINT32_SWAP_ON_BE( dbuf[1] ); |
| 185 | rmask = wxINT32_SWAP_ON_BE( dbuf[2] ); |
| 186 | /* find shift amount.. ugly, but i can't think of a better way */ |
| 187 | for (bit = 0; bit < bpp; bit++) |
| 188 | { |
| 189 | if (bmask & (1 << bit)) |
| 190 | bshift = bit; |
| 191 | if (gmask & (1 << bit)) |
| 192 | gshift = bit; |
| 193 | if (rmask & (1 << bit)) |
| 194 | rshift = bit; |
| 195 | } |
| 196 | } |
| 197 | else if (bpp == 16) |
| 198 | { |
| 199 | rmask = 0x7C00; |
| 200 | gmask = 0x03E0; |
| 201 | bmask = 0x001F; |
| 202 | rshift = 10; |
| 203 | gshift = 5; |
| 204 | bshift = 0; |
| 205 | } |
| 206 | else if (bpp == 32) |
| 207 | { |
| 208 | rmask = 0x00FF0000; |
| 209 | gmask = 0x0000FF00; |
| 210 | bmask = 0x000000FF; |
| 211 | rshift = 16; |
| 212 | gshift = 8; |
| 213 | bshift = 0; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Reading the image data |
| 219 | */ |
| 220 | stream.SeekI( start_offset + offset ); |
| 221 | unsigned char *data = ptr; |
| 222 | |
| 223 | /* set the whole image to the background color */ |
| 224 | if (bpp < 16 && (comp == BI_RLE4 || comp == BI_RLE8)) |
| 225 | { |
| 226 | for (int i = 0; i < width * height; i++) |
| 227 | { |
| 228 | *ptr++ = cmap[0].r; |
| 229 | *ptr++ = cmap[0].g; |
| 230 | *ptr++ = cmap[0].b; |
| 231 | } |
| 232 | ptr = data; |
| 233 | } |
| 234 | |
| 235 | int line = 0; |
| 236 | int column = 0; |
| 237 | int linesize = ((width * bpp + 31) / 32) * 4; |
| 238 | |
| 239 | /* BMPs are stored upside down */ |
| 240 | for (line = (height - 1); line >= 0; line--) |
| 241 | { |
| 242 | int linepos = 0; |
| 243 | for (column = 0; column < width;) |
| 244 | { |
| 245 | if (bpp < 16) |
| 246 | { |
| 247 | int index = 0; |
| 248 | linepos++; |
| 249 | aByte = stream.GetC(); |
| 250 | if (bpp == 1) |
| 251 | { |
| 252 | int bit = 0; |
| 253 | for (bit = 0; bit < 8; bit++) |
| 254 | { |
| 255 | index = ((aByte & (0x80 >> bit)) ? 1 : 0); |
| 256 | ptr[poffset] = cmap[index].r; |
| 257 | ptr[poffset + 1] = cmap[index].g; |
| 258 | ptr[poffset + 2] = cmap[index].b; |
| 259 | column++; |
| 260 | } |
| 261 | } |
| 262 | else if (bpp == 4) |
| 263 | { |
| 264 | if (comp == BI_RLE4) |
| 265 | { |
| 266 | wxLogError( _T("Can't deal with 4bit encoded yet.") ); |
| 267 | image->Destroy(); |
| 268 | free(cmap); |
| 269 | return FALSE; |
| 270 | } |
| 271 | else |
| 272 | { |
| 273 | int nibble = 0; |
| 274 | for (nibble = 0; nibble < 2; nibble++) |
| 275 | { |
| 276 | index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4)); |
| 277 | if (index >= 16) |
| 278 | index = 15; |
| 279 | ptr[poffset] = cmap[index].r; |
| 280 | ptr[poffset + 1] = cmap[index].g; |
| 281 | ptr[poffset + 2] = cmap[index].b; |
| 282 | column++; |
| 283 | } |
| 284 | } |
| 285 | } |
| 286 | else if (bpp == 8) |
| 287 | { |
| 288 | if (comp == BI_RLE8) |
| 289 | { |
| 290 | unsigned char first; |
| 291 | first = aByte; |
| 292 | aByte = stream.GetC(); |
| 293 | if (first == 0) |
| 294 | { |
| 295 | if (aByte == 0) |
| 296 | { |
| 297 | /* column = width; */ |
| 298 | } |
| 299 | else if (aByte == 1) |
| 300 | { |
| 301 | column = width; |
| 302 | line = -1; |
| 303 | } |
| 304 | else if (aByte == 2) |
| 305 | { |
| 306 | aByte = stream.GetC(); |
| 307 | column += aByte; |
| 308 | linepos = column * bpp / 8; |
| 309 | aByte = stream.GetC(); |
| 310 | line += aByte; |
| 311 | } |
| 312 | else |
| 313 | { |
| 314 | int absolute = aByte; |
| 315 | for (int k = 0; k < absolute; k++) |
| 316 | { |
| 317 | linepos++; |
| 318 | aByte = stream.GetC(); |
| 319 | ptr[poffset ] = cmap[aByte].r; |
| 320 | ptr[poffset + 1] = cmap[aByte].g; |
| 321 | ptr[poffset + 2] = cmap[aByte].b; |
| 322 | column++; |
| 323 | } |
| 324 | if (absolute & 0x01) |
| 325 | aByte = stream.GetC(); |
| 326 | } |
| 327 | } |
| 328 | else |
| 329 | { |
| 330 | for (int l = 0; l < first; l++) |
| 331 | { |
| 332 | ptr[poffset ] = cmap[aByte].r; |
| 333 | ptr[poffset + 1] = cmap[aByte].g; |
| 334 | ptr[poffset + 2] = cmap[aByte].b; |
| 335 | column++; |
| 336 | linepos++; |
| 337 | } |
| 338 | } |
| 339 | } |
| 340 | else |
| 341 | { |
| 342 | ptr[poffset ] = cmap[aByte].r; |
| 343 | ptr[poffset + 1] = cmap[aByte].g; |
| 344 | ptr[poffset + 2] = cmap[aByte].b; |
| 345 | column++; |
| 346 | // linepos += size; seems to be wrong, RR |
| 347 | } |
| 348 | } |
| 349 | } |
| 350 | else if (bpp == 24) |
| 351 | { |
| 352 | stream.Read( &bbuf, 3 ); |
| 353 | linepos += 3; |
| 354 | ptr[poffset ] = (unsigned char)bbuf[2]; |
| 355 | ptr[poffset + 1] = (unsigned char)bbuf[1]; |
| 356 | ptr[poffset + 2] = (unsigned char)bbuf[0]; |
| 357 | column++; |
| 358 | } |
| 359 | else if (bpp == 16) |
| 360 | { |
| 361 | unsigned char temp; |
| 362 | stream.Read( &aWord, 2 ); |
| 363 | aWord = wxUINT16_SWAP_ON_BE( aWord ); |
| 364 | linepos += 2; |
| 365 | temp = (aWord & rmask) >> rshift; |
| 366 | ptr[poffset] = temp; |
| 367 | temp = (aWord & gmask) >> gshift; |
| 368 | ptr[poffset + 1] = temp; |
| 369 | temp = (aWord & bmask) >> gshift; |
| 370 | ptr[poffset + 2] = temp; |
| 371 | column++; |
| 372 | } |
| 373 | else |
| 374 | { |
| 375 | unsigned char temp; |
| 376 | stream.Read( &aDword, 4 ); |
| 377 | aDword = wxINT32_SWAP_ON_BE( aDword ); |
| 378 | linepos += 4; |
| 379 | temp = (aDword & rmask) >> rshift; |
| 380 | ptr[poffset] = temp; |
| 381 | temp = (aDword & gmask) >> gshift; |
| 382 | ptr[poffset + 1] = temp; |
| 383 | temp = (aDword & bmask) >> bshift; |
| 384 | ptr[poffset + 2] = temp; |
| 385 | column++; |
| 386 | } |
| 387 | } |
| 388 | while ((linepos < linesize) && (comp != 1) && (comp != 2)) |
| 389 | { |
| 390 | stream.Read( &aByte, 1 ); |
| 391 | linepos += 1; |
| 392 | if (stream.LastError() != wxStream_NOERROR) |
| 393 | break; |
| 394 | } |
| 395 | } |
| 396 | if (cmap) |
| 397 | free(cmap); |
| 398 | |
| 399 | image->SetMask( FALSE ); |
| 400 | |
| 401 | return TRUE; |
| 402 | } |
| 403 | |
| 404 | #endif // wxUSE_STREAMS |
| 405 | |
| 406 | |