ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
module.graphic.bmp.php
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1<?php
4// available at http://getid3.sourceforge.net //
5// or http://www.getid3.org //
7// See readme.txt for more details //
9// //
10// module.graphic.bmp.php //
11// module for analyzing BMP Image files //
12// dependencies: NONE //
13// ///
15
16
17class getid3_bmp
18{
19
20 function getid3_bmp(&$fd, &$ThisFileInfo, $ExtractPalette=false, $ExtractData=false) {
21
22 // shortcuts
23 $ThisFileInfo['bmp']['header']['raw'] = array();
24 $thisfile_bmp = &$ThisFileInfo['bmp'];
25 $thisfile_bmp_header = &$thisfile_bmp['header'];
26 $thisfile_bmp_header_raw = &$thisfile_bmp_header['raw'];
27
28 // BITMAPFILEHEADER [14 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_62uq.asp
29 // all versions
30 // WORD bfType;
31 // DWORD bfSize;
32 // WORD bfReserved1;
33 // WORD bfReserved2;
34 // DWORD bfOffBits;
35
36 fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
37 $offset = 0;
38 $BMPheader = fread($fd, 14 + 40);
39
40 $thisfile_bmp_header_raw['identifier'] = substr($BMPheader, $offset, 2);
41 $offset += 2;
42
43 if ($thisfile_bmp_header_raw['identifier'] != 'BM') {
44 $ThisFileInfo['error'][] = 'Expecting "BM" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$thisfile_bmp_header_raw['identifier'].'"';
45 unset($ThisFileInfo['fileformat']);
46 unset($ThisFileInfo['bmp']);
47 return false;
48 }
49
50 $thisfile_bmp_header_raw['filesize'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
51 $offset += 4;
52 $thisfile_bmp_header_raw['reserved1'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
53 $offset += 2;
54 $thisfile_bmp_header_raw['reserved2'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
55 $offset += 2;
56 $thisfile_bmp_header_raw['data_offset'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
57 $offset += 4;
58 $thisfile_bmp_header_raw['header_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
59 $offset += 4;
60
61
62 // check if the hardcoded-to-1 "planes" is at offset 22 or 26
63 $planes22 = getid3_lib::LittleEndian2Int(substr($BMPheader, 22, 2));
64 $planes26 = getid3_lib::LittleEndian2Int(substr($BMPheader, 26, 2));
65 if (($planes22 == 1) && ($planes26 != 1)) {
66 $thisfile_bmp['type_os'] = 'OS/2';
67 $thisfile_bmp['type_version'] = 1;
68 } elseif (($planes26 == 1) && ($planes22 != 1)) {
69 $thisfile_bmp['type_os'] = 'Windows';
70 $thisfile_bmp['type_version'] = 1;
71 } elseif ($thisfile_bmp_header_raw['header_size'] == 12) {
72 $thisfile_bmp['type_os'] = 'OS/2';
73 $thisfile_bmp['type_version'] = 1;
74 } elseif ($thisfile_bmp_header_raw['header_size'] == 40) {
75 $thisfile_bmp['type_os'] = 'Windows';
76 $thisfile_bmp['type_version'] = 1;
77 } elseif ($thisfile_bmp_header_raw['header_size'] == 84) {
78 $thisfile_bmp['type_os'] = 'Windows';
79 $thisfile_bmp['type_version'] = 4;
80 } elseif ($thisfile_bmp_header_raw['header_size'] == 100) {
81 $thisfile_bmp['type_os'] = 'Windows';
82 $thisfile_bmp['type_version'] = 5;
83 } else {
84 $ThisFileInfo['error'][] = 'Unknown BMP subtype (or not a BMP file)';
85 unset($ThisFileInfo['fileformat']);
86 unset($ThisFileInfo['bmp']);
87 return false;
88 }
89
90 $ThisFileInfo['fileformat'] = 'bmp';
91 $ThisFileInfo['video']['dataformat'] = 'bmp';
92 $ThisFileInfo['video']['lossless'] = true;
93 $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1;
94
95 if ($thisfile_bmp['type_os'] == 'OS/2') {
96
97 // OS/2-format BMP
98 // http://netghost.narod.ru/gff/graphics/summary/os2bmp.htm
99
100 // DWORD Size; /* Size of this structure in bytes */
101 // DWORD Width; /* Bitmap width in pixels */
102 // DWORD Height; /* Bitmap height in pixel */
103 // WORD NumPlanes; /* Number of bit planes (color depth) */
104 // WORD BitsPerPixel; /* Number of bits per pixel per plane */
105
106 $thisfile_bmp_header_raw['width'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
107 $offset += 2;
108 $thisfile_bmp_header_raw['height'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
109 $offset += 2;
110 $thisfile_bmp_header_raw['planes'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
111 $offset += 2;
112 $thisfile_bmp_header_raw['bits_per_pixel'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
113 $offset += 2;
114
115 $ThisFileInfo['video']['resolution_x'] = $thisfile_bmp_header_raw['width'];
116 $ThisFileInfo['video']['resolution_y'] = $thisfile_bmp_header_raw['height'];
117 $ThisFileInfo['video']['codec'] = 'BI_RGB '.$thisfile_bmp_header_raw['bits_per_pixel'].'-bit';
118 $ThisFileInfo['video']['bits_per_sample'] = $thisfile_bmp_header_raw['bits_per_pixel'];
119
120 if ($thisfile_bmp['type_version'] >= 2) {
121 // DWORD Compression; /* Bitmap compression scheme */
122 // DWORD ImageDataSize; /* Size of bitmap data in bytes */
123 // DWORD XResolution; /* X resolution of display device */
124 // DWORD YResolution; /* Y resolution of display device */
125 // DWORD ColorsUsed; /* Number of color table indices used */
126 // DWORD ColorsImportant; /* Number of important color indices */
127 // WORD Units; /* Type of units used to measure resolution */
128 // WORD Reserved; /* Pad structure to 4-byte boundary */
129 // WORD Recording; /* Recording algorithm */
130 // WORD Rendering; /* Halftoning algorithm used */
131 // DWORD Size1; /* Reserved for halftoning algorithm use */
132 // DWORD Size2; /* Reserved for halftoning algorithm use */
133 // DWORD ColorEncoding; /* Color model used in bitmap */
134 // DWORD Identifier; /* Reserved for application use */
135
136 $thisfile_bmp_header_raw['compression'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
137 $offset += 4;
138 $thisfile_bmp_header_raw['bmp_data_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
139 $offset += 4;
140 $thisfile_bmp_header_raw['resolution_h'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
141 $offset += 4;
142 $thisfile_bmp_header_raw['resolution_v'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
143 $offset += 4;
144 $thisfile_bmp_header_raw['colors_used'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
145 $offset += 4;
146 $thisfile_bmp_header_raw['colors_important'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
147 $offset += 4;
148 $thisfile_bmp_header_raw['resolution_units'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
149 $offset += 2;
150 $thisfile_bmp_header_raw['reserved1'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
151 $offset += 2;
152 $thisfile_bmp_header_raw['recording'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
153 $offset += 2;
154 $thisfile_bmp_header_raw['rendering'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
155 $offset += 2;
156 $thisfile_bmp_header_raw['size1'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
157 $offset += 4;
158 $thisfile_bmp_header_raw['size2'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
159 $offset += 4;
160 $thisfile_bmp_header_raw['color_encoding'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
161 $offset += 4;
162 $thisfile_bmp_header_raw['identifier'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
163 $offset += 4;
164
165 $thisfile_bmp_header['compression'] = $this->BMPcompressionOS2Lookup($thisfile_bmp_header_raw['compression']);
166
167 $ThisFileInfo['video']['codec'] = $thisfile_bmp_header['compression'].' '.$thisfile_bmp_header_raw['bits_per_pixel'].'-bit';
168 }
169
170 } elseif ($thisfile_bmp['type_os'] == 'Windows') {
171
172 // Windows-format BMP
173
174 // BITMAPINFOHEADER - [40 bytes] http://msdn.microsoft.com/library/en-us/gdi/bitmaps_1rw2.asp
175 // all versions
176 // DWORD biSize;
177 // LONG biWidth;
178 // LONG biHeight;
179 // WORD biPlanes;
180 // WORD biBitCount;
181 // DWORD biCompression;
182 // DWORD biSizeImage;
183 // LONG biXPelsPerMeter;
184 // LONG biYPelsPerMeter;
185 // DWORD biClrUsed;
186 // DWORD biClrImportant;
187
188 $thisfile_bmp_header_raw['width'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true);
189 $offset += 4;
190 $thisfile_bmp_header_raw['height'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true);
191 $offset += 4;
192 $thisfile_bmp_header_raw['planes'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
193 $offset += 2;
194 $thisfile_bmp_header_raw['bits_per_pixel'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
195 $offset += 2;
196 $thisfile_bmp_header_raw['compression'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
197 $offset += 4;
198 $thisfile_bmp_header_raw['bmp_data_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
199 $offset += 4;
200 $thisfile_bmp_header_raw['resolution_h'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true);
201 $offset += 4;
202 $thisfile_bmp_header_raw['resolution_v'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true);
203 $offset += 4;
204 $thisfile_bmp_header_raw['colors_used'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
205 $offset += 4;
206 $thisfile_bmp_header_raw['colors_important'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
207 $offset += 4;
208
209 $thisfile_bmp_header['compression'] = $this->BMPcompressionWindowsLookup($thisfile_bmp_header_raw['compression']);
210 $ThisFileInfo['video']['resolution_x'] = $thisfile_bmp_header_raw['width'];
211 $ThisFileInfo['video']['resolution_y'] = $thisfile_bmp_header_raw['height'];
212 $ThisFileInfo['video']['codec'] = $thisfile_bmp_header['compression'].' '.$thisfile_bmp_header_raw['bits_per_pixel'].'-bit';
213 $ThisFileInfo['video']['bits_per_sample'] = $thisfile_bmp_header_raw['bits_per_pixel'];
214
215 if (($thisfile_bmp['type_version'] >= 4) || ($thisfile_bmp_header_raw['compression'] == 3)) {
216 // should only be v4+, but BMPs with type_version==1 and BI_BITFIELDS compression have been seen
217 $BMPheader .= fread($fd, 44);
218
219 // BITMAPV4HEADER - [44 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_2k1e.asp
220 // Win95+, WinNT4.0+
221 // DWORD bV4RedMask;
222 // DWORD bV4GreenMask;
223 // DWORD bV4BlueMask;
224 // DWORD bV4AlphaMask;
225 // DWORD bV4CSType;
226 // CIEXYZTRIPLE bV4Endpoints;
227 // DWORD bV4GammaRed;
228 // DWORD bV4GammaGreen;
229 // DWORD bV4GammaBlue;
230 $thisfile_bmp_header_raw['red_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
231 $offset += 4;
232 $thisfile_bmp_header_raw['green_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
233 $offset += 4;
234 $thisfile_bmp_header_raw['blue_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
235 $offset += 4;
236 $thisfile_bmp_header_raw['alpha_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
237 $offset += 4;
238 $thisfile_bmp_header_raw['cs_type'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
239 $offset += 4;
240 $thisfile_bmp_header_raw['ciexyz_red'] = substr($BMPheader, $offset, 4);
241 $offset += 4;
242 $thisfile_bmp_header_raw['ciexyz_green'] = substr($BMPheader, $offset, 4);
243 $offset += 4;
244 $thisfile_bmp_header_raw['ciexyz_blue'] = substr($BMPheader, $offset, 4);
245 $offset += 4;
246 $thisfile_bmp_header_raw['gamma_red'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
247 $offset += 4;
248 $thisfile_bmp_header_raw['gamma_green'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
249 $offset += 4;
250 $thisfile_bmp_header_raw['gamma_blue'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
251 $offset += 4;
252
253 $thisfile_bmp_header['ciexyz_red'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_red']));
254 $thisfile_bmp_header['ciexyz_green'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_green']));
255 $thisfile_bmp_header['ciexyz_blue'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_blue']));
256 }
257
258 if ($thisfile_bmp['type_version'] >= 5) {
259 $BMPheader .= fread($fd, 16);
260
261 // BITMAPV5HEADER - [16 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_7c36.asp
262 // Win98+, Win2000+
263 // DWORD bV5Intent;
264 // DWORD bV5ProfileData;
265 // DWORD bV5ProfileSize;
266 // DWORD bV5Reserved;
267 $thisfile_bmp_header_raw['intent'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
268 $offset += 4;
269 $thisfile_bmp_header_raw['profile_data_offset'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
270 $offset += 4;
271 $thisfile_bmp_header_raw['profile_data_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
272 $offset += 4;
273 $thisfile_bmp_header_raw['reserved3'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
274 $offset += 4;
275 }
276
277 } else {
278
279 $ThisFileInfo['error'][] = 'Unknown BMP format in header.';
280 return false;
281
282 }
283
284
285 if ($ExtractPalette || $ExtractData) {
286 $PaletteEntries = 0;
287 if ($thisfile_bmp_header_raw['bits_per_pixel'] < 16) {
288 $PaletteEntries = pow(2, $thisfile_bmp_header_raw['bits_per_pixel']);
289 } elseif (isset($thisfile_bmp_header_raw['colors_used']) && ($thisfile_bmp_header_raw['colors_used'] > 0) && ($thisfile_bmp_header_raw['colors_used'] <= 256)) {
290 $PaletteEntries = $thisfile_bmp_header_raw['colors_used'];
291 }
292 if ($PaletteEntries > 0) {
293 $BMPpalette = fread($fd, 4 * $PaletteEntries);
294 $paletteoffset = 0;
295 for ($i = 0; $i < $PaletteEntries; $i++) {
296 // RGBQUAD - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_5f8y.asp
297 // BYTE rgbBlue;
298 // BYTE rgbGreen;
299 // BYTE rgbRed;
300 // BYTE rgbReserved;
301 $blue = getid3_lib::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1));
302 $green = getid3_lib::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1));
303 $red = getid3_lib::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1));
304 if (($thisfile_bmp['type_os'] == 'OS/2') && ($thisfile_bmp['type_version'] == 1)) {
305 // no padding byte
306 } else {
307 $paletteoffset++; // padding byte
308 }
309 $thisfile_bmp['palette'][$i] = (($red << 16) | ($green << 8) | $blue);
310 }
311 }
312 }
313
314 if ($ExtractData) {
315 fseek($fd, $thisfile_bmp_header_raw['data_offset'], SEEK_SET);
316 $RowByteLength = ceil(($thisfile_bmp_header_raw['width'] * ($thisfile_bmp_header_raw['bits_per_pixel'] / 8)) / 4) * 4; // round up to nearest DWORD boundry
317 $BMPpixelData = fread($fd, $thisfile_bmp_header_raw['height'] * $RowByteLength);
318 $pixeldataoffset = 0;
319 switch (@$thisfile_bmp_header_raw['compression']) {
320
321 case 0: // BI_RGB
322 switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
323 case 1:
324 for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
325 for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col = $col) {
326 $paletteindexbyte = ord($BMPpixelData{$pixeldataoffset++});
327 for ($i = 7; $i >= 0; $i--) {
328 $paletteindex = ($paletteindexbyte & (0x01 << $i)) >> $i;
329 $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
330 $col++;
331 }
332 }
333 while (($pixeldataoffset % 4) != 0) {
334 // lines are padded to nearest DWORD
335 $pixeldataoffset++;
336 }
337 }
338 break;
339
340 case 4:
341 for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
342 for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col = $col) {
343 $paletteindexbyte = ord($BMPpixelData{$pixeldataoffset++});
344 for ($i = 1; $i >= 0; $i--) {
345 $paletteindex = ($paletteindexbyte & (0x0F << (4 * $i))) >> (4 * $i);
346 $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
347 $col++;
348 }
349 }
350 while (($pixeldataoffset % 4) != 0) {
351 // lines are padded to nearest DWORD
352 $pixeldataoffset++;
353 }
354 }
355 break;
356
357 case 8:
358 for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
359 for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
360 $paletteindex = ord($BMPpixelData{$pixeldataoffset++});
361 $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
362 }
363 while (($pixeldataoffset % 4) != 0) {
364 // lines are padded to nearest DWORD
365 $pixeldataoffset++;
366 }
367 }
368 break;
369
370 case 24:
371 for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
372 for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
373 $thisfile_bmp['data'][$row][$col] = (ord($BMPpixelData{$pixeldataoffset+2}) << 16) | (ord($BMPpixelData{$pixeldataoffset+1}) << 8) | ord($BMPpixelData{$pixeldataoffset});
374 $pixeldataoffset += 3;
375 }
376 while (($pixeldataoffset % 4) != 0) {
377 // lines are padded to nearest DWORD
378 $pixeldataoffset++;
379 }
380 }
381 break;
382
383 case 32:
384 for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
385 for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
386 $thisfile_bmp['data'][$row][$col] = (ord($BMPpixelData{$pixeldataoffset+3}) << 24) | (ord($BMPpixelData{$pixeldataoffset+2}) << 16) | (ord($BMPpixelData{$pixeldataoffset+1}) << 8) | ord($BMPpixelData{$pixeldataoffset});
387 $pixeldataoffset += 4;
388 }
389 while (($pixeldataoffset % 4) != 0) {
390 // lines are padded to nearest DWORD
391 $pixeldataoffset++;
392 }
393 }
394 break;
395
396 case 16:
397 // ?
398 break;
399
400 default:
401 $ThisFileInfo['error'][] = 'Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data';
402 break;
403 }
404 break;
405
406
407 case 1: // BI_RLE8 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp
408 switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
409 case 8:
410 $pixelcounter = 0;
411 while ($pixeldataoffset < strlen($BMPpixelData)) {
412 $firstbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
413 $secondbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
414 if ($firstbyte == 0) {
415
416 // escaped/absolute mode - the first byte of the pair can be set to zero to
417 // indicate an escape character that denotes the end of a line, the end of
418 // a bitmap, or a delta, depending on the value of the second byte.
419 switch ($secondbyte) {
420 case 0:
421 // end of line
422 // no need for special processing, just ignore
423 break;
424
425 case 1:
426 // end of bitmap
427 $pixeldataoffset = strlen($BMPpixelData); // force to exit loop just in case
428 break;
429
430 case 2:
431 // delta - The 2 bytes following the escape contain unsigned values
432 // indicating the horizontal and vertical offsets of the next pixel
433 // from the current position.
434 $colincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
435 $rowincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
436 $col = ($pixelcounter % $thisfile_bmp_header_raw['width']) + $colincrement;
437 $row = ($thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width'])) - $rowincrement;
438 $pixelcounter = ($row * $thisfile_bmp_header_raw['width']) + $col;
439 break;
440
441 default:
442 // In absolute mode, the first byte is zero and the second byte is a
443 // value in the range 03H through FFH. The second byte represents the
444 // number of bytes that follow, each of which contains the color index
445 // of a single pixel. Each run must be aligned on a word boundary.
446 for ($i = 0; $i < $secondbyte; $i++) {
447 $paletteindex = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
448 $col = $pixelcounter % $thisfile_bmp_header_raw['width'];
449 $row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
450 $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
451 $pixelcounter++;
452 }
453 while (($pixeldataoffset % 2) != 0) {
454 // Each run must be aligned on a word boundary.
455 $pixeldataoffset++;
456 }
457 break;
458 }
459
460 } else {
461
462 // encoded mode - the first byte specifies the number of consecutive pixels
463 // to be drawn using the color index contained in the second byte.
464 for ($i = 0; $i < $firstbyte; $i++) {
465 $col = $pixelcounter % $thisfile_bmp_header_raw['width'];
466 $row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
467 $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$secondbyte];
468 $pixelcounter++;
469 }
470
471 }
472 }
473 break;
474
475 default:
476 $ThisFileInfo['error'][] = 'Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data';
477 break;
478 }
479 break;
480
481
482
483 case 2: // BI_RLE4 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp
484 switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
485 case 4:
486 $pixelcounter = 0;
487 while ($pixeldataoffset < strlen($BMPpixelData)) {
488 $firstbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
489 $secondbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
490 if ($firstbyte == 0) {
491
492 // escaped/absolute mode - the first byte of the pair can be set to zero to
493 // indicate an escape character that denotes the end of a line, the end of
494 // a bitmap, or a delta, depending on the value of the second byte.
495 switch ($secondbyte) {
496 case 0:
497 // end of line
498 // no need for special processing, just ignore
499 break;
500
501 case 1:
502 // end of bitmap
503 $pixeldataoffset = strlen($BMPpixelData); // force to exit loop just in case
504 break;
505
506 case 2:
507 // delta - The 2 bytes following the escape contain unsigned values
508 // indicating the horizontal and vertical offsets of the next pixel
509 // from the current position.
510 $colincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
511 $rowincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
512 $col = ($pixelcounter % $thisfile_bmp_header_raw['width']) + $colincrement;
513 $row = ($thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width'])) - $rowincrement;
514 $pixelcounter = ($row * $thisfile_bmp_header_raw['width']) + $col;
515 break;
516
517 default:
518 // In absolute mode, the first byte is zero. The second byte contains the number
519 // of color indexes that follow. Subsequent bytes contain color indexes in their
520 // high- and low-order 4 bits, one color index for each pixel. In absolute mode,
521 // each run must be aligned on a word boundary.
522 unset($paletteindexes);
523 for ($i = 0; $i < ceil($secondbyte / 2); $i++) {
524 $paletteindexbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
525 $paletteindexes[] = ($paletteindexbyte & 0xF0) >> 4;
526 $paletteindexes[] = ($paletteindexbyte & 0x0F);
527 }
528 while (($pixeldataoffset % 2) != 0) {
529 // Each run must be aligned on a word boundary.
530 $pixeldataoffset++;
531 }
532
533 foreach ($paletteindexes as $paletteindex) {
534 $col = $pixelcounter % $thisfile_bmp_header_raw['width'];
535 $row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
536 $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
537 $pixelcounter++;
538 }
539 break;
540 }
541
542 } else {
543
544 // encoded mode - the first byte of the pair contains the number of pixels to be
545 // drawn using the color indexes in the second byte. The second byte contains two
546 // color indexes, one in its high-order 4 bits and one in its low-order 4 bits.
547 // The first of the pixels is drawn using the color specified by the high-order
548 // 4 bits, the second is drawn using the color in the low-order 4 bits, the third
549 // is drawn using the color in the high-order 4 bits, and so on, until all the
550 // pixels specified by the first byte have been drawn.
551 $paletteindexes[0] = ($secondbyte & 0xF0) >> 4;
552 $paletteindexes[1] = ($secondbyte & 0x0F);
553 for ($i = 0; $i < $firstbyte; $i++) {
554 $col = $pixelcounter % $thisfile_bmp_header_raw['width'];
555 $row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
556 $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindexes[($i % 2)]];
557 $pixelcounter++;
558 }
559
560 }
561 }
562 break;
563
564 default:
565 $ThisFileInfo['error'][] = 'Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data';
566 break;
567 }
568 break;
569
570
571 case 3: // BI_BITFIELDS
572 switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
573 case 16:
574 case 32:
575 $redshift = 0;
576 $greenshift = 0;
577 $blueshift = 0;
578 while ((($thisfile_bmp_header_raw['red_mask'] >> $redshift) & 0x01) == 0) {
579 $redshift++;
580 }
581 while ((($thisfile_bmp_header_raw['green_mask'] >> $greenshift) & 0x01) == 0) {
582 $greenshift++;
583 }
584 while ((($thisfile_bmp_header_raw['blue_mask'] >> $blueshift) & 0x01) == 0) {
585 $blueshift++;
586 }
587 for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
588 for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
589 $pixelvalue = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset, $thisfile_bmp_header_raw['bits_per_pixel'] / 8));
590 $pixeldataoffset += $thisfile_bmp_header_raw['bits_per_pixel'] / 8;
591
592 $red = intval(round(((($pixelvalue & $thisfile_bmp_header_raw['red_mask']) >> $redshift) / ($thisfile_bmp_header_raw['red_mask'] >> $redshift)) * 255));
593 $green = intval(round(((($pixelvalue & $thisfile_bmp_header_raw['green_mask']) >> $greenshift) / ($thisfile_bmp_header_raw['green_mask'] >> $greenshift)) * 255));
594 $blue = intval(round(((($pixelvalue & $thisfile_bmp_header_raw['blue_mask']) >> $blueshift) / ($thisfile_bmp_header_raw['blue_mask'] >> $blueshift)) * 255));
595 $thisfile_bmp['data'][$row][$col] = (($red << 16) | ($green << 8) | ($blue));
596 }
597 while (($pixeldataoffset % 4) != 0) {
598 // lines are padded to nearest DWORD
599 $pixeldataoffset++;
600 }
601 }
602 break;
603
604 default:
605 $ThisFileInfo['error'][] = 'Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data';
606 break;
607 }
608 break;
609
610
611 default: // unhandled compression type
612 $ThisFileInfo['error'][] = 'Unknown/unhandled compression type value ('.$thisfile_bmp_header_raw['compression'].') - cannot decompress pixel data';
613 break;
614 }
615 }
616
617 return true;
618 }
619
620
621 function PlotBMP(&$BMPinfo) {
622 $starttime = time();
623 if (!isset($BMPinfo['bmp']['data']) || !is_array($BMPinfo['bmp']['data'])) {
624 echo 'ERROR: no pixel data<BR>';
625 return false;
626 }
627 set_time_limit(intval(round($BMPinfo['resolution_x'] * $BMPinfo['resolution_y'] / 10000)));
628 if ($im = ImageCreateTrueColor($BMPinfo['resolution_x'], $BMPinfo['resolution_y'])) {
629 for ($row = 0; $row < $BMPinfo['resolution_y']; $row++) {
630 for ($col = 0; $col < $BMPinfo['resolution_x']; $col++) {
631 if (isset($BMPinfo['bmp']['data'][$row][$col])) {
632 $red = ($BMPinfo['bmp']['data'][$row][$col] & 0x00FF0000) >> 16;
633 $green = ($BMPinfo['bmp']['data'][$row][$col] & 0x0000FF00) >> 8;
634 $blue = ($BMPinfo['bmp']['data'][$row][$col] & 0x000000FF);
635 $pixelcolor = ImageColorAllocate($im, $red, $green, $blue);
636 ImageSetPixel($im, $col, $row, $pixelcolor);
637 } else {
638 //echo 'ERROR: no data for pixel '.$row.' x '.$col.'<BR>';
639 //return false;
640 }
641 }
642 }
643 if (headers_sent()) {
644 echo 'plotted '.($BMPinfo['resolution_x'] * $BMPinfo['resolution_y']).' pixels in '.(time() - $starttime).' seconds<BR>';
645 ImageDestroy($im);
646 exit;
647 } else {
648 header('Content-type: image/png');
649 ImagePNG($im);
650 ImageDestroy($im);
651 return true;
652 }
653 }
654 return false;
655 }
656
657 function BMPcompressionWindowsLookup($compressionid) {
658 static $BMPcompressionWindowsLookup = array(
659 0 => 'BI_RGB',
660 1 => 'BI_RLE8',
661 2 => 'BI_RLE4',
662 3 => 'BI_BITFIELDS',
663 4 => 'BI_JPEG',
664 5 => 'BI_PNG'
665 );
666 return (isset($BMPcompressionWindowsLookup[$compressionid]) ? $BMPcompressionWindowsLookup[$compressionid] : 'invalid');
667 }
668
669 function BMPcompressionOS2Lookup($compressionid) {
670 static $BMPcompressionOS2Lookup = array(
671 0 => 'BI_RGB',
672 1 => 'BI_RLE8',
673 2 => 'BI_RLE4',
674 3 => 'Huffman 1D',
675 4 => 'BI_RLE24',
676 );
677 return (isset($BMPcompressionOS2Lookup[$compressionid]) ? $BMPcompressionOS2Lookup[$compressionid] : 'invalid');
678 }
679
680}
681
682
683?>
getid3_bmp
getID3() by James Heinrich info@getid3.org //
Definition: module.graphic.bmp.php:18
getid3_bmp\PlotBMP
PlotBMP(&$BMPinfo)
Definition: module.graphic.bmp.php:621
getid3_bmp\BMPcompressionOS2Lookup
BMPcompressionOS2Lookup($compressionid)
Definition: module.graphic.bmp.php:669
getid3_bmp\$ExtractPalette
$ExtractPalette
Definition: module.graphic.bmp.php:20
getid3_bmp\$ExtractData
$ExtractData
Definition: module.graphic.bmp.php:21
getid3_bmp\getid3_bmp
getid3_bmp(&$fd, &$ThisFileInfo, $ExtractPalette=false, $ExtractData=false)
Definition: module.graphic.bmp.php:20
getid3_bmp\BMPcompressionWindowsLookup
BMPcompressionWindowsLookup($compressionid)
Definition: module.graphic.bmp.php:657
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
getid3_lib\LittleEndian2Int
LittleEndian2Int($byteword, $signed=false)
Definition: getid3.lib.php:266
getid3_lib\FixedPoint2_30
FixedPoint2_30($rawdata)
Definition: getid3.lib.php:459
$red
$red
Definition: example_030.php:80
$green
$green
Definition: example_030.php:83
$blue
$blue
Definition: example_030.php:81
exit
exit
Definition: login.php:54