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module.graphic.bmp.php @ 8804

Last change on this file since 8804 was 3544, checked in by vdigital, 15 years ago
Change: getid3 upgraded to -> 1.7.9
Property svn:eol-style set to `LF` Property svn:keywords set to `Author Date Id Revision`
File size: 30.5 KB

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1	<?php
2	/////////////////////////////////////////////////////////////////
3	/// getID3() by James Heinrich <info@getid3.org> //
4	// available at http://getid3.sourceforge.net //
5	// or http://www.getid3.org //
6	/////////////////////////////////////////////////////////////////
7	// See readme.txt for more details //
8	/////////////////////////////////////////////////////////////////
9	// //
10	// module.graphic.bmp.php //
11	// module for analyzing BMP Image files //
12	// dependencies: NONE //
13	// ///
14	/////////////////////////////////////////////////////////////////
15
16
17	class 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	// possibly integrate this section and module.audio-video.riff.php::ParseBITMAPINFOHEADER() ?
189
190	$thisfile_bmp_header_raw['width'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true);
191	$offset += 4;
192	$thisfile_bmp_header_raw['height'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true);
193	$offset += 4;
194	$thisfile_bmp_header_raw['planes'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
195	$offset += 2;
196	$thisfile_bmp_header_raw['bits_per_pixel'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2));
197	$offset += 2;
198	$thisfile_bmp_header_raw['compression'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
199	$offset += 4;
200	$thisfile_bmp_header_raw['bmp_data_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
201	$offset += 4;
202	$thisfile_bmp_header_raw['resolution_h'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true);
203	$offset += 4;
204	$thisfile_bmp_header_raw['resolution_v'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true);
205	$offset += 4;
206	$thisfile_bmp_header_raw['colors_used'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
207	$offset += 4;
208	$thisfile_bmp_header_raw['colors_important'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
209	$offset += 4;
210
211	$thisfile_bmp_header['compression'] = $this->BMPcompressionWindowsLookup($thisfile_bmp_header_raw['compression']);
212	$ThisFileInfo['video']['resolution_x'] = $thisfile_bmp_header_raw['width'];
213	$ThisFileInfo['video']['resolution_y'] = $thisfile_bmp_header_raw['height'];
214	$ThisFileInfo['video']['codec'] = $thisfile_bmp_header['compression'].' '.$thisfile_bmp_header_raw['bits_per_pixel'].'-bit';
215	$ThisFileInfo['video']['bits_per_sample'] = $thisfile_bmp_header_raw['bits_per_pixel'];
216
217	if (($thisfile_bmp['type_version'] >= 4) \|\| ($thisfile_bmp_header_raw['compression'] == 3)) {
218	// should only be v4+, but BMPs with type_version==1 and BI_BITFIELDS compression have been seen
219	$BMPheader .= fread($fd, 44);
220
221	// BITMAPV4HEADER - [44 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_2k1e.asp
222	// Win95+, WinNT4.0+
223	// DWORD bV4RedMask;
224	// DWORD bV4GreenMask;
225	// DWORD bV4BlueMask;
226	// DWORD bV4AlphaMask;
227	// DWORD bV4CSType;
228	// CIEXYZTRIPLE bV4Endpoints;
229	// DWORD bV4GammaRed;
230	// DWORD bV4GammaGreen;
231	// DWORD bV4GammaBlue;
232	$thisfile_bmp_header_raw['red_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
233	$offset += 4;
234	$thisfile_bmp_header_raw['green_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
235	$offset += 4;
236	$thisfile_bmp_header_raw['blue_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
237	$offset += 4;
238	$thisfile_bmp_header_raw['alpha_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
239	$offset += 4;
240	$thisfile_bmp_header_raw['cs_type'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
241	$offset += 4;
242	$thisfile_bmp_header_raw['ciexyz_red'] = substr($BMPheader, $offset, 4);
243	$offset += 4;
244	$thisfile_bmp_header_raw['ciexyz_green'] = substr($BMPheader, $offset, 4);
245	$offset += 4;
246	$thisfile_bmp_header_raw['ciexyz_blue'] = substr($BMPheader, $offset, 4);
247	$offset += 4;
248	$thisfile_bmp_header_raw['gamma_red'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
249	$offset += 4;
250	$thisfile_bmp_header_raw['gamma_green'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
251	$offset += 4;
252	$thisfile_bmp_header_raw['gamma_blue'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
253	$offset += 4;
254
255	$thisfile_bmp_header['ciexyz_red'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_red']));
256	$thisfile_bmp_header['ciexyz_green'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_green']));
257	$thisfile_bmp_header['ciexyz_blue'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_blue']));
258	}
259
260	if ($thisfile_bmp['type_version'] >= 5) {
261	$BMPheader .= fread($fd, 16);
262
263	// BITMAPV5HEADER - [16 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_7c36.asp
264	// Win98+, Win2000+
265	// DWORD bV5Intent;
266	// DWORD bV5ProfileData;
267	// DWORD bV5ProfileSize;
268	// DWORD bV5Reserved;
269	$thisfile_bmp_header_raw['intent'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
270	$offset += 4;
271	$thisfile_bmp_header_raw['profile_data_offset'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
272	$offset += 4;
273	$thisfile_bmp_header_raw['profile_data_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
274	$offset += 4;
275	$thisfile_bmp_header_raw['reserved3'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4));
276	$offset += 4;
277	}
278
279	} else {
280
281	$ThisFileInfo['error'][] = 'Unknown BMP format in header.';
282	return false;
283
284	}
285
286
287	if ($ExtractPalette \|\| $ExtractData) {
288	$PaletteEntries = 0;
289	if ($thisfile_bmp_header_raw['bits_per_pixel'] < 16) {
290	$PaletteEntries = pow(2, $thisfile_bmp_header_raw['bits_per_pixel']);
291	} elseif (isset($thisfile_bmp_header_raw['colors_used']) && ($thisfile_bmp_header_raw['colors_used'] > 0) && ($thisfile_bmp_header_raw['colors_used'] <= 256)) {
292	$PaletteEntries = $thisfile_bmp_header_raw['colors_used'];
293	}
294	if ($PaletteEntries > 0) {
295	$BMPpalette = fread($fd, 4 * $PaletteEntries);
296	$paletteoffset = 0;
297	for ($i = 0; $i < $PaletteEntries; $i++) {
298	// RGBQUAD - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_5f8y.asp
299	// BYTE rgbBlue;
300	// BYTE rgbGreen;
301	// BYTE rgbRed;
302	// BYTE rgbReserved;
303	$blue = getid3_lib::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1));
304	$green = getid3_lib::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1));
305	$red = getid3_lib::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1));
306	if (($thisfile_bmp['type_os'] == 'OS/2') && ($thisfile_bmp['type_version'] == 1)) {
307	// no padding byte
308	} else {
309	$paletteoffset++; // padding byte
310	}
311	$thisfile_bmp['palette'][$i] = (($red << 16) \| ($green << 8) \| $blue);
312	}
313	}
314	}
315
316	if ($ExtractData) {
317	fseek($fd, $thisfile_bmp_header_raw['data_offset'], SEEK_SET);
318	$RowByteLength = ceil(($thisfile_bmp_header_raw['width'] * ($thisfile_bmp_header_raw['bits_per_pixel'] / 8)) / 4) * 4; // round up to nearest DWORD boundry
319	$BMPpixelData = fread($fd, $thisfile_bmp_header_raw['height'] * $RowByteLength);
320	$pixeldataoffset = 0;
321	switch (@$thisfile_bmp_header_raw['compression']) {
322
323	case 0: // BI_RGB
324	switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
325	case 1:
326	for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
327	for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col = $col) {
328	$paletteindexbyte = ord($BMPpixelData{$pixeldataoffset++});
329	for ($i = 7; $i >= 0; $i--) {
330	$paletteindex = ($paletteindexbyte & (0x01 << $i)) >> $i;
331	$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
332	$col++;
333	}
334	}
335	while (($pixeldataoffset % 4) != 0) {
336	// lines are padded to nearest DWORD
337	$pixeldataoffset++;
338	}
339	}
340	break;
341
342	case 4:
343	for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
344	for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col = $col) {
345	$paletteindexbyte = ord($BMPpixelData{$pixeldataoffset++});
346	for ($i = 1; $i >= 0; $i--) {
347	$paletteindex = ($paletteindexbyte & (0x0F << (4 * $i))) >> (4 * $i);
348	$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
349	$col++;
350	}
351	}
352	while (($pixeldataoffset % 4) != 0) {
353	// lines are padded to nearest DWORD
354	$pixeldataoffset++;
355	}
356	}
357	break;
358
359	case 8:
360	for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
361	for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
362	$paletteindex = ord($BMPpixelData{$pixeldataoffset++});
363	$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
364	}
365	while (($pixeldataoffset % 4) != 0) {
366	// lines are padded to nearest DWORD
367	$pixeldataoffset++;
368	}
369	}
370	break;
371
372	case 24:
373	for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
374	for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
375	$thisfile_bmp['data'][$row][$col] = (ord($BMPpixelData{$pixeldataoffset+2}) << 16) \| (ord($BMPpixelData{$pixeldataoffset+1}) << 8) \| ord($BMPpixelData{$pixeldataoffset});
376	$pixeldataoffset += 3;
377	}
378	while (($pixeldataoffset % 4) != 0) {
379	// lines are padded to nearest DWORD
380	$pixeldataoffset++;
381	}
382	}
383	break;
384
385	case 32:
386	for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
387	for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
388	$thisfile_bmp['data'][$row][$col] = (ord($BMPpixelData{$pixeldataoffset+3}) << 24) \| (ord($BMPpixelData{$pixeldataoffset+2}) << 16) \| (ord($BMPpixelData{$pixeldataoffset+1}) << 8) \| ord($BMPpixelData{$pixeldataoffset});
389	$pixeldataoffset += 4;
390	}
391	while (($pixeldataoffset % 4) != 0) {
392	// lines are padded to nearest DWORD
393	$pixeldataoffset++;
394	}
395	}
396	break;
397
398	case 16:
399	// ?
400	break;
401
402	default:
403	$ThisFileInfo['error'][] = 'Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data';
404	break;
405	}
406	break;
407
408
409	case 1: // BI_RLE8 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp
410	switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
411	case 8:
412	$pixelcounter = 0;
413	while ($pixeldataoffset < strlen($BMPpixelData)) {
414	$firstbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
415	$secondbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
416	if ($firstbyte == 0) {
417
418	// escaped/absolute mode - the first byte of the pair can be set to zero to
419	// indicate an escape character that denotes the end of a line, the end of
420	// a bitmap, or a delta, depending on the value of the second byte.
421	switch ($secondbyte) {
422	case 0:
423	// end of line
424	// no need for special processing, just ignore
425	break;
426
427	case 1:
428	// end of bitmap
429	$pixeldataoffset = strlen($BMPpixelData); // force to exit loop just in case
430	break;
431
432	case 2:
433	// delta - The 2 bytes following the escape contain unsigned values
434	// indicating the horizontal and vertical offsets of the next pixel
435	// from the current position.
436	$colincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
437	$rowincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
438	$col = ($pixelcounter % $thisfile_bmp_header_raw['width']) + $colincrement;
439	$row = ($thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width'])) - $rowincrement;
440	$pixelcounter = ($row * $thisfile_bmp_header_raw['width']) + $col;
441	break;
442
443	default:
444	// In absolute mode, the first byte is zero and the second byte is a
445	// value in the range 03H through FFH. The second byte represents the
446	// number of bytes that follow, each of which contains the color index
447	// of a single pixel. Each run must be aligned on a word boundary.
448	for ($i = 0; $i < $secondbyte; $i++) {
449	$paletteindex = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
450	$col = $pixelcounter % $thisfile_bmp_header_raw['width'];
451	$row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
452	$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
453	$pixelcounter++;
454	}
455	while (($pixeldataoffset % 2) != 0) {
456	// Each run must be aligned on a word boundary.
457	$pixeldataoffset++;
458	}
459	break;
460	}
461
462	} else {
463
464	// encoded mode - the first byte specifies the number of consecutive pixels
465	// to be drawn using the color index contained in the second byte.
466	for ($i = 0; $i < $firstbyte; $i++) {
467	$col = $pixelcounter % $thisfile_bmp_header_raw['width'];
468	$row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
469	$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$secondbyte];
470	$pixelcounter++;
471	}
472
473	}
474	}
475	break;
476
477	default:
478	$ThisFileInfo['error'][] = 'Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data';
479	break;
480	}
481	break;
482
483
484
485	case 2: // BI_RLE4 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp
486	switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
487	case 4:
488	$pixelcounter = 0;
489	while ($pixeldataoffset < strlen($BMPpixelData)) {
490	$firstbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
491	$secondbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
492	if ($firstbyte == 0) {
493
494	// escaped/absolute mode - the first byte of the pair can be set to zero to
495	// indicate an escape character that denotes the end of a line, the end of
496	// a bitmap, or a delta, depending on the value of the second byte.
497	switch ($secondbyte) {
498	case 0:
499	// end of line
500	// no need for special processing, just ignore
501	break;
502
503	case 1:
504	// end of bitmap
505	$pixeldataoffset = strlen($BMPpixelData); // force to exit loop just in case
506	break;
507
508	case 2:
509	// delta - The 2 bytes following the escape contain unsigned values
510	// indicating the horizontal and vertical offsets of the next pixel
511	// from the current position.
512	$colincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
513	$rowincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
514	$col = ($pixelcounter % $thisfile_bmp_header_raw['width']) + $colincrement;
515	$row = ($thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width'])) - $rowincrement;
516	$pixelcounter = ($row * $thisfile_bmp_header_raw['width']) + $col;
517	break;
518
519	default:
520	// In absolute mode, the first byte is zero. The second byte contains the number
521	// of color indexes that follow. Subsequent bytes contain color indexes in their
522	// high- and low-order 4 bits, one color index for each pixel. In absolute mode,
523	// each run must be aligned on a word boundary.
524	unset($paletteindexes);
525	for ($i = 0; $i < ceil($secondbyte / 2); $i++) {
526	$paletteindexbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1));
527	$paletteindexes[] = ($paletteindexbyte & 0xF0) >> 4;
528	$paletteindexes[] = ($paletteindexbyte & 0x0F);
529	}
530	while (($pixeldataoffset % 2) != 0) {
531	// Each run must be aligned on a word boundary.
532	$pixeldataoffset++;
533	}
534
535	foreach ($paletteindexes as $paletteindex) {
536	$col = $pixelcounter % $thisfile_bmp_header_raw['width'];
537	$row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
538	$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex];
539	$pixelcounter++;
540	}
541	break;
542	}
543
544	} else {
545
546	// encoded mode - the first byte of the pair contains the number of pixels to be
547	// drawn using the color indexes in the second byte. The second byte contains two
548	// color indexes, one in its high-order 4 bits and one in its low-order 4 bits.
549	// The first of the pixels is drawn using the color specified by the high-order
550	// 4 bits, the second is drawn using the color in the low-order 4 bits, the third
551	// is drawn using the color in the high-order 4 bits, and so on, until all the
552	// pixels specified by the first byte have been drawn.
553	$paletteindexes[0] = ($secondbyte & 0xF0) >> 4;
554	$paletteindexes[1] = ($secondbyte & 0x0F);
555	for ($i = 0; $i < $firstbyte; $i++) {
556	$col = $pixelcounter % $thisfile_bmp_header_raw['width'];
557	$row = $thisfile_bmp_header_raw['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw['width']);
558	$thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindexes[($i % 2)]];
559	$pixelcounter++;
560	}
561
562	}
563	}
564	break;
565
566	default:
567	$ThisFileInfo['error'][] = 'Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data';
568	break;
569	}
570	break;
571
572
573	case 3: // BI_BITFIELDS
574	switch ($thisfile_bmp_header_raw['bits_per_pixel']) {
575	case 16:
576	case 32:
577	$redshift = 0;
578	$greenshift = 0;
579	$blueshift = 0;
580	while ((($thisfile_bmp_header_raw['red_mask'] >> $redshift) & 0x01) == 0) {
581	$redshift++;
582	}
583	while ((($thisfile_bmp_header_raw['green_mask'] >> $greenshift) & 0x01) == 0) {
584	$greenshift++;
585	}
586	while ((($thisfile_bmp_header_raw['blue_mask'] >> $blueshift) & 0x01) == 0) {
587	$blueshift++;
588	}
589	for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) {
590	for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) {
591	$pixelvalue = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset, $thisfile_bmp_header_raw['bits_per_pixel'] / 8));
592	$pixeldataoffset += $thisfile_bmp_header_raw['bits_per_pixel'] / 8;
593
594	$red = intval(round(((($pixelvalue & $thisfile_bmp_header_raw['red_mask']) >> $redshift) / ($thisfile_bmp_header_raw['red_mask'] >> $redshift)) * 255));
595	$green = intval(round(((($pixelvalue & $thisfile_bmp_header_raw['green_mask']) >> $greenshift) / ($thisfile_bmp_header_raw['green_mask'] >> $greenshift)) * 255));
596	$blue = intval(round(((($pixelvalue & $thisfile_bmp_header_raw['blue_mask']) >> $blueshift) / ($thisfile_bmp_header_raw['blue_mask'] >> $blueshift)) * 255));
597	$thisfile_bmp['data'][$row][$col] = (($red << 16) \| ($green << 8) \| ($blue));
598	}
599	while (($pixeldataoffset % 4) != 0) {
600	// lines are padded to nearest DWORD
601	$pixeldataoffset++;
602	}
603	}
604	break;
605
606	default:
607	$ThisFileInfo['error'][] = 'Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data';
608	break;
609	}
610	break;
611
612
613	default: // unhandled compression type
614	$ThisFileInfo['error'][] = 'Unknown/unhandled compression type value ('.$thisfile_bmp_header_raw['compression'].') - cannot decompress pixel data';
615	break;
616	}
617	}
618
619	return true;
620	}
621
622
623	function PlotBMP(&$BMPinfo) {
624	$starttime = time();
625	if (!isset($BMPinfo['bmp']['data']) \|\| !is_array($BMPinfo['bmp']['data'])) {
626	echo 'ERROR: no pixel data<BR>';
627	return false;
628	}
629	set_time_limit(intval(round($BMPinfo['resolution_x'] * $BMPinfo['resolution_y'] / 10000)));
630	if ($im = ImageCreateTrueColor($BMPinfo['resolution_x'], $BMPinfo['resolution_y'])) {
631	for ($row = 0; $row < $BMPinfo['resolution_y']; $row++) {
632	for ($col = 0; $col < $BMPinfo['resolution_x']; $col++) {
633	if (isset($BMPinfo['bmp']['data'][$row][$col])) {
634	$red = ($BMPinfo['bmp']['data'][$row][$col] & 0x00FF0000) >> 16;
635	$green = ($BMPinfo['bmp']['data'][$row][$col] & 0x0000FF00) >> 8;
636	$blue = ($BMPinfo['bmp']['data'][$row][$col] & 0x000000FF);
637	$pixelcolor = ImageColorAllocate($im, $red, $green, $blue);
638	ImageSetPixel($im, $col, $row, $pixelcolor);
639	} else {
640	//echo 'ERROR: no data for pixel '.$row.' x '.$col.'<BR>';
641	//return false;
642	}
643	}
644	}
645	if (headers_sent()) {
646	echo 'plotted '.($BMPinfo['resolution_x'] * $BMPinfo['resolution_y']).' pixels in '.(time() - $starttime).' seconds<BR>';
647	ImageDestroy($im);
648	exit;
649	} else {
650	header('Content-type: image/png');
651	ImagePNG($im);
652	ImageDestroy($im);
653	return true;
654	}
655	}
656	return false;
657	}
658
659	function BMPcompressionWindowsLookup($compressionid) {
660	static $BMPcompressionWindowsLookup = array(
661	0 => 'BI_RGB',
662	1 => 'BI_RLE8',
663	2 => 'BI_RLE4',
664	3 => 'BI_BITFIELDS',
665	4 => 'BI_JPEG',
666	5 => 'BI_PNG'
667	);
668	return (isset($BMPcompressionWindowsLookup[$compressionid]) ? $BMPcompressionWindowsLookup[$compressionid] : 'invalid');
669	}
670
671	function BMPcompressionOS2Lookup($compressionid) {
672	static $BMPcompressionOS2Lookup = array(
673	0 => 'BI_RGB',
674	1 => 'BI_RLE8',
675	2 => 'BI_RLE4',
676	3 => 'Huffman 1D',
677	4 => 'BI_RLE24',
678	);
679	return (isset($BMPcompressionOS2Lookup[$compressionid]) ? $BMPcompressionOS2Lookup[$compressionid] : 'invalid');
680	}
681
682	}
683
684
685	?>

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source: extensions/charlies_content/getid3/getid3/module.graphic.bmp.php @ 8804

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