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[wxWidgets.git] / src / common / imagbmp.cpp
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: imagbmp.cpp
3 // Purpose: wxImage BMP,ICO and CUR handlers
4 // Author: Robert Roebling, Chris Elliott
5 // RCS-ID: $Id$
6 // Copyright: (c) Robert Roebling, Chris Elliott
7 // Licence: wxWindows licence
8 /////////////////////////////////////////////////////////////////////////////
9
10 #ifdef __GNUG__
11 #pragma implementation "imagbmp.h"
12 #endif
13
14 // For compilers that support precompilation, includes "wx.h".
15 #include "wx/wxprec.h"
16
17 #ifdef __BORLANDC__
18 #pragma hdrstop
19 #endif
20
21 #include "wx/defs.h"
22
23 #if wxUSE_IMAGE && wxUSE_STREAMS
24
25 #include "wx/imagbmp.h"
26 #include "wx/bitmap.h"
27 #include "wx/debug.h"
28 #include "wx/log.h"
29 #include "wx/app.h"
30 #include "wx/filefn.h"
31 #include "wx/wfstream.h"
32 #include "wx/intl.h"
33 #include "wx/module.h"
34 #include "wx/quantize.h"
35
36 // For memcpy
37 #include <string.h>
38
39 #ifdef __SALFORDC__
40 #ifdef FAR
41 #undef FAR
42 #endif
43 #endif
44
45 #ifdef __WXMSW__
46 #include <windows.h>
47 #endif
48
49 //-----------------------------------------------------------------------------
50 // wxBMPHandler
51 //-----------------------------------------------------------------------------
52
53 IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler)
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::SaveFile(wxImage *image,
68 wxOutputStream& stream,
69 bool verbose)
70 {
71 return SaveDib(image, stream, verbose, TRUE/*IsBmp*/, FALSE/*IsMask*/);
72 }
73
74 bool wxBMPHandler::SaveDib(wxImage *image,
75 wxOutputStream& stream,
76 bool verbose,
77 bool IsBmp,
78 bool IsMask)
79
80 {
81 wxCHECK_MSG( image, FALSE, _T("invalid pointer in wxBMPHandler::SaveFile") );
82
83 if ( !image->Ok() )
84 {
85 if ( verbose )
86 wxLogError(_("BMP: Couldn't save invalid image."));
87 return FALSE;
88 }
89
90 // get the format of the BMP file to save, else use 24bpp
91 unsigned format = wxBMP_24BPP;
92 if ( image->HasOption(wxIMAGE_OPTION_BMP_FORMAT) )
93 format = image->GetOptionInt(wxIMAGE_OPTION_BMP_FORMAT);
94
95 wxUint16 bpp; // # of bits per pixel
96 int palette_size; // # of color map entries, ie. 2^bpp colors
97
98 // set the bpp and appropriate palette_size, and do additional checks
99 if ( (format == wxBMP_1BPP) || (format == wxBMP_1BPP_BW) )
100 {
101 bpp = 1;
102 palette_size = 2;
103 }
104 else if ( format == wxBMP_4BPP )
105 {
106 bpp = 4;
107 palette_size = 16;
108 }
109 else if ( (format == wxBMP_8BPP) || (format == wxBMP_8BPP_GREY) ||
110 (format == wxBMP_8BPP_RED) || (format == wxBMP_8BPP_PALETTE) )
111 {
112 // need to set a wxPalette to use this, HOW TO CHECK IF VALID, SIZE?
113 if ((format == wxBMP_8BPP_PALETTE)
114 #if wxUSE_PALETTE
115 && !image->HasPalette()
116 #endif // wxUSE_PALETTE
117 )
118 {
119 if ( verbose )
120 wxLogError(_("BMP: wxImage doesn't have own wxPalette."));
121 return FALSE;
122 }
123 bpp = 8;
124 palette_size = 256;
125 }
126 else // you get 24bpp
127 {
128 format = wxBMP_24BPP;
129 bpp = 24;
130 palette_size = 0;
131 }
132
133 unsigned width = image->GetWidth();
134 unsigned row_padding = (4 - int(width*bpp/8.0) % 4) % 4; // # bytes to pad to dword
135 unsigned row_width = int(width * bpp/8.0) + row_padding; // # of bytes per row
136
137 struct
138 {
139 // BitmapHeader:
140 wxUint16 magic; // format magic, always 'BM'
141 wxUint32 filesize; // total file size, inc. headers
142 wxUint32 reserved; // for future use
143 wxUint32 data_offset; // image data offset in the file
144
145 // BitmapInfoHeader:
146 wxUint32 bih_size; // 2nd part's size
147 wxUint32 width, height; // bitmap's dimensions
148 wxUint16 planes; // num of planes
149 wxUint16 bpp; // bits per pixel
150 wxUint32 compression; // compression method
151 wxUint32 size_of_bmp; // size of the bitmap
152 wxUint32 h_res, v_res; // image resolution in dpi
153 wxUint32 num_clrs; // number of colors used
154 wxUint32 num_signif_clrs;// number of significant colors
155 } hdr;
156
157 wxUint32 hdr_size = 14/*BitmapHeader*/ + 40/*BitmapInfoHeader*/;
158
159 hdr.magic = wxUINT16_SWAP_ON_BE(0x4D42/*'BM'*/);
160 hdr.filesize = wxUINT32_SWAP_ON_BE( hdr_size + palette_size*4 +
161 row_width * image->GetHeight() );
162 hdr.reserved = 0;
163 hdr.data_offset = wxUINT32_SWAP_ON_BE(hdr_size + palette_size*4);
164
165 hdr.bih_size = wxUINT32_SWAP_ON_BE(hdr_size - 14);
166 hdr.width = wxUINT32_SWAP_ON_BE(image->GetWidth());
167 if ( IsBmp )
168 {
169 hdr.height = wxUINT32_SWAP_ON_BE(image->GetHeight());
170 }
171 else
172 {
173 hdr.height = wxUINT32_SWAP_ON_BE(2 * image->GetHeight());
174 }
175 hdr.planes = wxUINT16_SWAP_ON_BE(1); // always 1 plane
176 hdr.bpp = wxUINT16_SWAP_ON_BE(bpp);
177 hdr.compression = 0; // RGB uncompressed
178 hdr.size_of_bmp = wxUINT32_SWAP_ON_BE(row_width * image->GetHeight());
179 hdr.h_res = hdr.v_res = wxUINT32_SWAP_ON_BE(72); // 72dpi is standard
180 hdr.num_clrs = wxUINT32_SWAP_ON_BE(palette_size); // # colors in colormap
181 hdr.num_signif_clrs = 0; // all colors are significant
182
183 if ( IsBmp )
184 {
185 if (// VS: looks ugly but compilers tend to do ugly things with structs,
186 // like aligning hdr.filesize's ofset to dword :(
187 // VZ: we should add padding then...
188 !stream.Write(&hdr.magic, 2) ||
189 !stream.Write(&hdr.filesize, 4) ||
190 !stream.Write(&hdr.reserved, 4) ||
191 !stream.Write(&hdr.data_offset, 4)
192 )
193 {
194 if (verbose)
195 wxLogError(_("BMP: Couldn't write the file (Bitmap) header."));
196 return FALSE;
197 }
198 }
199 if ( !IsMask )
200 {
201 if (
202 !stream.Write(&hdr.bih_size, 4) ||
203 !stream.Write(&hdr.width, 4) ||
204 !stream.Write(&hdr.height, 4) ||
205 !stream.Write(&hdr.planes, 2) ||
206 !stream.Write(&hdr.bpp, 2) ||
207 !stream.Write(&hdr.compression, 4) ||
208 !stream.Write(&hdr.size_of_bmp, 4) ||
209 !stream.Write(&hdr.h_res, 4) ||
210 !stream.Write(&hdr.v_res, 4) ||
211 !stream.Write(&hdr.num_clrs, 4) ||
212 !stream.Write(&hdr.num_signif_clrs, 4)
213 )
214 {
215 if (verbose)
216 wxLogError(_("BMP: Couldn't write the file (BitmapInfo) header."));
217 return FALSE;
218 }
219 }
220
221 wxPalette *palette = NULL; // entries for quantized images
222 wxUint8 *rgbquad = NULL; // for the RGBQUAD bytes for the colormap
223 wxImage *q_image = NULL; // destination for quantized image
224
225 // if <24bpp use quantization to reduce colors for *some* of the formats
226 if ( (format == wxBMP_1BPP) || (format == wxBMP_4BPP) ||
227 (format == wxBMP_8BPP) || (format == wxBMP_8BPP_PALETTE) )
228 {
229 // make a new palette and quantize the image
230 if (format != wxBMP_8BPP_PALETTE)
231 {
232 q_image = new wxImage();
233
234 // I get a delete error using Quantize when desired colors > 236
235 int quantize = ((palette_size > 236) ? 236 : palette_size);
236 // fill the destination too, it gives much nicer 4bpp images
237 wxQuantize::Quantize( *image, *q_image, &palette, quantize, 0,
238 wxQUANTIZE_FILL_DESTINATION_IMAGE );
239 }
240 else
241 {
242 #if wxUSE_PALETTE
243 palette = new wxPalette(image->GetPalette());
244 #endif // wxUSE_PALETTE
245 }
246
247 int i;
248 unsigned char r, g, b;
249 rgbquad = new wxUint8 [palette_size*4];
250
251 for (i = 0; i < palette_size; i++)
252 {
253 #if wxUSE_PALETTE
254 if ( !palette->GetRGB(i, &r, &g, &b) )
255 #endif // wxUSE_PALETTE
256 r = g = b = 0;
257
258 rgbquad[i*4] = b;
259 rgbquad[i*4+1] = g;
260 rgbquad[i*4+2] = r;
261 rgbquad[i*4+3] = 0;
262 }
263 }
264 // make a 256 entry greyscale colormap or 2 entry black & white
265 else if ( (format == wxBMP_8BPP_GREY) || (format == wxBMP_8BPP_RED) ||
266 (format == wxBMP_1BPP_BW) )
267 {
268 int i;
269 rgbquad = new wxUint8 [palette_size*4];
270
271 for (i = 0; i < palette_size; i++)
272 {
273 // if 1BPP_BW then just 0 and 255 then exit
274 if (( i > 0) && (format == wxBMP_1BPP_BW)) i = 255;
275 rgbquad[i*4] = i;
276 rgbquad[i*4+1] = i;
277 rgbquad[i*4+2] = i;
278 rgbquad[i*4+3] = 0;
279 }
280 }
281
282 // if the colormap was made, then it needs to be written
283 if (rgbquad)
284 {
285 if ( !IsMask )
286 {
287 if ( !stream.Write(rgbquad, palette_size*4) )
288 {
289 if (verbose)
290 wxLogError(_("BMP: Couldn't write RGB color map."));
291 delete[] rgbquad;
292 #if wxUSE_PALETTE
293 delete palette;
294 #endif // wxUSE_PALETTE
295 delete q_image;
296 return FALSE;
297 }
298 }
299 delete []rgbquad;
300 }
301
302 // pointer to the image data, use quantized if available
303 wxUint8 *data = (wxUint8*) image->GetData();
304 if (q_image) if (q_image->Ok()) data = (wxUint8*) q_image->GetData();
305
306 wxUint8 *buffer = new wxUint8[row_width];
307 memset(buffer, 0, row_width);
308 int y; unsigned x;
309 long int pixel;
310
311 for (y = image->GetHeight() -1; y >= 0; y--)
312 {
313 if ( format == wxBMP_24BPP ) // 3 bytes per pixel red,green,blue
314 {
315 for ( x = 0; x < width; x++ )
316 {
317 pixel = 3*(y*width + x);
318
319 buffer[3*x ] = data[pixel+2];
320 buffer[3*x + 1] = data[pixel+1];
321 buffer[3*x + 2] = data[pixel];
322 }
323 }
324 else if ((format == wxBMP_8BPP) || // 1 byte per pixel in color
325 (format == wxBMP_8BPP_PALETTE))
326 {
327 for (x = 0; x < width; x++)
328 {
329 pixel = 3*(y*width + x);
330 #if wxUSE_PALETTE
331 buffer[x] = palette->GetPixel( data[pixel],
332 data[pixel+1],
333 data[pixel+2] );
334 #else
335 // FIXME: what should this be? use some std palette maybe?
336 buffer[x] = 0;
337 #endif // wxUSE_PALETTE
338 }
339 }
340 else if ( format == wxBMP_8BPP_GREY ) // 1 byte per pix, rgb ave to grey
341 {
342 for (x = 0; x < width; x++)
343 {
344 pixel = 3*(y*width + x);
345 buffer[x] = (wxUint8)(.299*data[pixel] +
346 .587*data[pixel+1] +
347 .114*data[pixel+2]);
348 }
349 }
350 else if ( format == wxBMP_8BPP_RED ) // 1 byte per pixel, red as greys
351 {
352 for (x = 0; x < width; x++)
353 {
354 buffer[x] = (wxUint8)data[3*(y*width + x)];
355 }
356 }
357 else if ( format == wxBMP_4BPP ) // 4 bpp in color
358 {
359 for (x = 0; x < width; x+=2)
360 {
361 pixel = 3*(y*width + x);
362
363 // fill buffer, ignore if > width
364 #if wxUSE_PALETTE
365 buffer[x/2] =
366 ((wxUint8)palette->GetPixel(data[pixel],
367 data[pixel+1],
368 data[pixel+2]) << 4) |
369 (((x+1) > width)
370 ? 0
371 : ((wxUint8)palette->GetPixel(data[pixel+3],
372 data[pixel+4],
373 data[pixel+5]) ));
374 #else
375 // FIXME: what should this be? use some std palette maybe?
376 buffer[x/2] = 0;
377 #endif // wxUSE_PALETTE
378 }
379 }
380 else if ( format == wxBMP_1BPP ) // 1 bpp in "color"
381 {
382 for (x = 0; x < width; x+=8)
383 {
384 pixel = 3*(y*width + x);
385
386 #if wxUSE_PALETTE
387 buffer[x/8] = ((wxUint8)palette->GetPixel(data[pixel], data[pixel+1], data[pixel+2]) << 7) |
388 (((x+1) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+3], data[pixel+4], data[pixel+5]) << 6)) |
389 (((x+2) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+6], data[pixel+7], data[pixel+8]) << 5)) |
390 (((x+3) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+9], data[pixel+10], data[pixel+11]) << 4)) |
391 (((x+4) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+12], data[pixel+13], data[pixel+14]) << 3)) |
392 (((x+5) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+15], data[pixel+16], data[pixel+17]) << 2)) |
393 (((x+6) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+18], data[pixel+19], data[pixel+20]) << 1)) |
394 (((x+7) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+21], data[pixel+22], data[pixel+23]) ));
395 #else
396 // FIXME: what should this be? use some std palette maybe?
397 buffer[x/8] = 0;
398 #endif // wxUSE_PALETTE
399 }
400 }
401 else if ( format == wxBMP_1BPP_BW ) // 1 bpp B&W colormap from red color ONLY
402 {
403 for (x = 0; x < width; x+=8)
404 {
405 pixel = 3*(y*width + x);
406
407 buffer[x/8] =
408 (((wxUint8)(data[pixel] /128.)) << 7) |
409 (((x+1) > width) ? 0 : (((wxUint8)(data[pixel+3] /128.)) << 6)) |
410 (((x+2) > width) ? 0 : (((wxUint8)(data[pixel+6] /128.)) << 5)) |
411 (((x+3) > width) ? 0 : (((wxUint8)(data[pixel+9] /128.)) << 4)) |
412 (((x+4) > width) ? 0 : (((wxUint8)(data[pixel+12]/128.)) << 3)) |
413 (((x+5) > width) ? 0 : (((wxUint8)(data[pixel+15]/128.)) << 2)) |
414 (((x+6) > width) ? 0 : (((wxUint8)(data[pixel+18]/128.)) << 1)) |
415 (((x+7) > width) ? 0 : (((wxUint8)(data[pixel+21]/128.)) ));
416 }
417 }
418
419 if ( !stream.Write(buffer, row_width) )
420 {
421 if (verbose)
422 wxLogError(_("BMP: Couldn't write data."));
423 delete[] buffer;
424 #if wxUSE_PALETTE
425 delete palette;
426 #endif // wxUSE_PALETTE
427 delete q_image;
428 return FALSE;
429 }
430 }
431 delete[] buffer;
432 #if wxUSE_PALETTE
433 delete palette;
434 #endif // wxUSE_PALETTE
435 delete q_image;
436
437 return TRUE;
438 }
439
440
441 typedef struct
442 {
443 unsigned char r, g, b;
444 } _cmap;
445
446 bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
447 int bpp, int ncolors, int comp,
448 off_t bmpOffset, wxInputStream& stream,
449 bool verbose, bool IsBmp, bool hasPalette)
450 {
451 wxInt32 aDword, rmask = 0, gmask = 0, bmask = 0;
452 int rshift = 0, gshift = 0, bshift = 0;
453 int rbits = 0, gbits = 0, bbits = 0;
454 wxInt32 dbuf[4];
455 wxInt8 bbuf[4];
456 wxUint8 aByte;
457 wxUint16 aWord;
458
459 // allocate space for palette if needed:
460 _cmap *cmap = NULL;
461
462 if ( bpp < 16 )
463 {
464 cmap = new _cmap[ncolors];
465 if ( !cmap )
466 {
467 if (verbose)
468 wxLogError(_("BMP: Couldn't allocate memory."));
469 return FALSE;
470 }
471 }
472 else
473 cmap = NULL;
474
475 // destroy existing here instead of:
476 image->Destroy();
477 image->Create(width, height);
478
479 unsigned char *ptr = image->GetData();
480
481 if ( !ptr )
482 {
483 if ( verbose )
484 wxLogError( _("BMP: Couldn't allocate memory.") );
485 if ( cmap )
486 delete[] cmap;
487 return FALSE;
488 }
489
490 // Reading the palette, if it exists:
491 if ( bpp < 16 && ncolors != 0 )
492 {
493 unsigned char* r = new unsigned char[ncolors];
494 unsigned char* g = new unsigned char[ncolors];
495 unsigned char* b = new unsigned char[ncolors];
496 for (int j = 0; j < ncolors; j++)
497 {
498 if (hasPalette)
499 {
500 stream.Read(bbuf, 4);
501 cmap[j].b = bbuf[0];
502 cmap[j].g = bbuf[1];
503 cmap[j].r = bbuf[2];
504
505 r[j] = cmap[j].r;
506 g[j] = cmap[j].g;
507 b[j] = cmap[j].b;
508 }
509 else
510 {
511 //used in reading .ico file mask
512 r[j] = cmap[j].r = j * 255;
513 g[j] = cmap[j].g = j * 255;
514 b[j] = cmap[j].b = j * 255;
515 }
516 }
517
518 #if wxUSE_PALETTE
519 // Set the palette for the wxImage
520 image->SetPalette(wxPalette(ncolors, r, g, b));
521 #endif // wxUSE_PALETTE
522
523 delete[] r;
524 delete[] g;
525 delete[] b;
526 }
527 else if ( bpp == 16 || bpp == 32 )
528 {
529 if ( comp == BI_BITFIELDS )
530 {
531 int bit = 0;
532 stream.Read(dbuf, 4 * 3);
533 rmask = wxINT32_SWAP_ON_BE(dbuf[0]);
534 gmask = wxINT32_SWAP_ON_BE(dbuf[1]);
535 bmask = wxINT32_SWAP_ON_BE(dbuf[2]);
536 // find shift amount (Least significant bit of mask)
537 for (bit = bpp-1; bit>=0; bit--)
538 {
539 if (bmask & (1 << bit))
540 bshift = bit;
541 if (gmask & (1 << bit))
542 gshift = bit;
543 if (rmask & (1 << bit))
544 rshift = bit;
545 }
546 // Find number of bits in mask (MSB-LSB+1)
547 for (bit = 0; bit < bpp; bit++)
548 {
549 if (bmask & (1 << bit))
550 bbits = bit-bshift+1;
551 if (gmask & (1 << bit))
552 gbits = bit-gshift+1;
553 if (rmask & (1 << bit))
554 rbits = bit-rshift+1;
555 }
556 }
557 else if ( bpp == 16 )
558 {
559 rmask = 0x7C00;
560 gmask = 0x03E0;
561 bmask = 0x001F;
562 rshift = 10;
563 gshift = 5;
564 bshift = 0;
565 rbits = 5;
566 gbits = 5;
567 bbits = 5;
568 }
569 else if ( bpp == 32 )
570 {
571 rmask = 0x00FF0000;
572 gmask = 0x0000FF00;
573 bmask = 0x000000FF;
574 rshift = 16;
575 gshift = 8;
576 bshift = 0;
577 rbits = 8;
578 gbits = 8;
579 bbits = 8;
580 }
581 }
582
583 /*
584 * Reading the image data
585 */
586 if ( IsBmp )
587 stream.SeekI(bmpOffset); // else icon, just carry on
588
589 unsigned char *data = ptr;
590
591 /* set the whole image to the background color */
592 if ( bpp < 16 && (comp == BI_RLE4 || comp == BI_RLE8) )
593 {
594 for (int i = 0; i < width * height; i++)
595 {
596 *ptr++ = cmap[0].r;
597 *ptr++ = cmap[0].g;
598 *ptr++ = cmap[0].b;
599 }
600 ptr = data;
601 }
602
603 int line = 0;
604 int column = 0;
605 int linesize = ((width * bpp + 31) / 32) * 4;
606
607 /* BMPs are stored upside down */
608 for ( line = (height - 1); line >= 0; line-- )
609 {
610 int linepos = 0;
611 for ( column = 0; column < width; )
612 {
613 if ( bpp < 16 )
614 {
615 int index = 0;
616 linepos++;
617 aByte = stream.GetC();
618 if ( bpp == 1 )
619 {
620 int bit = 0;
621 for (bit = 0; bit < 8 && column < width; bit++)
622 {
623 index = ((aByte & (0x80 >> bit)) ? 1 : 0);
624 ptr[poffset] = cmap[index].r;
625 ptr[poffset + 1] = cmap[index].g;
626 ptr[poffset + 2] = cmap[index].b;
627 column++;
628 }
629 }
630 else if ( bpp == 4 )
631 {
632 if ( comp == BI_RLE4 )
633 {
634 if ( verbose )
635 wxLogError(_("DIB Header: Cannot deal with 4bit encoded yet."));
636 image->Destroy();
637 delete[] cmap;
638 return FALSE;
639 }
640 else
641 {
642 int nibble = 0;
643 for (nibble = 0; nibble < 2 && column < width; nibble++)
644 {
645 index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
646 if ( index >= 16 )
647 index = 15;
648 ptr[poffset] = cmap[index].r;
649 ptr[poffset + 1] = cmap[index].g;
650 ptr[poffset + 2] = cmap[index].b;
651 column++;
652 }
653 }
654 }
655 else if ( bpp == 8 )
656 {
657 if ( comp == BI_RLE8 )
658 {
659 unsigned char first;
660 first = aByte;
661 aByte = stream.GetC();
662 if ( first == 0 )
663 {
664 if ( aByte == 0 )
665 {
666 /* column = width; */
667 }
668 else if ( aByte == 1 )
669 {
670 column = width;
671 line = -1;
672 }
673 else if ( aByte == 2 )
674 {
675 aByte = stream.GetC();
676 column += aByte;
677 linepos = column * bpp / 8;
678 aByte = stream.GetC();
679 line += aByte;
680 }
681 else
682 {
683 int absolute = aByte;
684 for (int k = 0; k < absolute; k++)
685 {
686 linepos++;
687 aByte = stream.GetC();
688 ptr[poffset ] = cmap[aByte].r;
689 ptr[poffset + 1] = cmap[aByte].g;
690 ptr[poffset + 2] = cmap[aByte].b;
691 column++;
692 }
693 if ( absolute & 0x01 )
694 aByte = stream.GetC();
695 }
696 }
697 else
698 {
699 for ( int l = 0; l < first && column < width; l++ )
700 {
701 ptr[poffset ] = cmap[aByte].r;
702 ptr[poffset + 1] = cmap[aByte].g;
703 ptr[poffset + 2] = cmap[aByte].b;
704 column++;
705 linepos++;
706 }
707 }
708 }
709 else
710 {
711 ptr[poffset ] = cmap[aByte].r;
712 ptr[poffset + 1] = cmap[aByte].g;
713 ptr[poffset + 2] = cmap[aByte].b;
714 column++;
715 // linepos += size; seems to be wrong, RR
716 }
717 }
718 }
719 else if ( bpp == 24 )
720 {
721 stream.Read(bbuf, 3);
722 linepos += 3;
723 ptr[poffset ] = (unsigned char)bbuf[2];
724 ptr[poffset + 1] = (unsigned char)bbuf[1];
725 ptr[poffset + 2] = (unsigned char)bbuf[0];
726 column++;
727 }
728 else if ( bpp == 16 )
729 {
730 unsigned char temp;
731 stream.Read(&aWord, 2);
732 aWord = wxUINT16_SWAP_ON_BE(aWord);
733 linepos += 2;
734 /* use the masks and calculated amonut of shift
735 to retrieve the color data out of the word. Then
736 shift it left by (8 - number of bits) such that
737 the image has the proper dynamic range */
738 temp = (aWord & rmask) >> rshift << (8-rbits);
739 ptr[poffset] = temp;
740 temp = (aWord & gmask) >> gshift << (8-gbits);
741 ptr[poffset + 1] = temp;
742 temp = (aWord & bmask) >> bshift << (8-bbits);
743 ptr[poffset + 2] = temp;
744 column++;
745 }
746 else
747 {
748 unsigned char temp;
749 stream.Read(&aDword, 4);
750 aDword = wxINT32_SWAP_ON_BE(aDword);
751 linepos += 4;
752 temp = (aDword & rmask) >> rshift;
753 ptr[poffset] = temp;
754 temp = (aDword & gmask) >> gshift;
755 ptr[poffset + 1] = temp;
756 temp = (aDword & bmask) >> bshift;
757 ptr[poffset + 2] = temp;
758 column++;
759 }
760 }
761 while ( (linepos < linesize) && (comp != 1) && (comp != 2) )
762 {
763 stream.Read(&aByte, 1);
764 linepos += 1;
765 if ( stream.LastError() != wxStream_NOERROR )
766 break;
767 }
768 }
769 if (cmap)
770 delete[] cmap;
771
772 image->SetMask(FALSE);
773
774 return ( stream.LastError() == wxSTREAM_NO_ERROR || stream.LastError() == wxSTREAM_EOF );
775 }
776
777 bool wxBMPHandler::LoadDib(wxImage *image, wxInputStream& stream,
778 bool verbose, bool IsBmp)
779 {
780 wxUint16 aWord;
781 wxInt32 dbuf[4];
782 wxInt8 bbuf[4];
783 off_t offset;
784
785 offset = 0; // keep gcc quiet
786 if ( IsBmp )
787 {
788 // read the header off the .BMP format file
789
790 offset = stream.TellI();
791 if (offset == wxInvalidOffset) offset = 0;
792
793 stream.Read(bbuf, 2);
794 stream.Read(dbuf, 16);
795 }
796 else
797 {
798 stream.Read(dbuf, 4);
799 }
800 #if 0 // unused
801 wxInt32 size = wxINT32_SWAP_ON_BE(dbuf[0]);
802 #endif
803 offset = offset + wxINT32_SWAP_ON_BE(dbuf[2]);
804
805 stream.Read(dbuf, 4 * 2);
806 int width = (int)wxINT32_SWAP_ON_BE(dbuf[0]);
807 int height = (int)wxINT32_SWAP_ON_BE(dbuf[1]);
808 if ( !IsBmp)height = height / 2; // for icons divide by 2
809
810 if ( width > 32767 )
811 {
812 if (verbose)
813 wxLogError( _("DIB Header: Image width > 32767 pixels for file.") );
814 return FALSE;
815 }
816 if ( height > 32767 )
817 {
818 if (verbose)
819 wxLogError( _("DIB Header: Image height > 32767 pixels for file.") );
820 return FALSE;
821 }
822
823 stream.Read(&aWord, 2);
824 /*
825 TODO
826 int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
827 */
828 stream.Read(&aWord, 2);
829 int bpp = (int)wxUINT16_SWAP_ON_BE(aWord);
830 if ( bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32 )
831 {
832 if (verbose)
833 wxLogError( _("DIB Header: Unknown bitdepth in file.") );
834 return FALSE;
835 }
836
837 stream.Read(dbuf, 4 * 4);
838 int comp = (int)wxINT32_SWAP_ON_BE(dbuf[0]);
839 if ( comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 &&
840 comp != BI_BITFIELDS )
841 {
842 if (verbose)
843 wxLogError( _("DIB Header: Unknown encoding in file.") );
844 return FALSE;
845 }
846
847 stream.Read(dbuf, 4 * 2);
848 int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
849 if (ncolors == 0)
850 ncolors = 1 << bpp;
851 /* some more sanity checks */
852 if (((comp == BI_RLE4) && (bpp != 4)) ||
853 ((comp == BI_RLE8) && (bpp != 8)) ||
854 ((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
855 {
856 if (verbose)
857 wxLogError( _("DIB Header: Encoding doesn't match bitdepth.") );
858 return FALSE;
859 }
860
861 //read DIB; this is the BMP image or the XOR part of an icon image
862 if ( !DoLoadDib(image, width, height, bpp, ncolors, comp, offset, stream,
863 verbose, IsBmp, TRUE) )
864 {
865 if (verbose)
866 wxLogError( _("Error in reading image DIB .") );
867 return FALSE;
868 }
869
870 if ( !IsBmp )
871 {
872 //read Icon mask which is monochrome
873 //there is no palette, so we will create one
874 wxImage mask;
875 if ( !DoLoadDib(&mask, width, height, 1, 2, BI_RGB, offset, stream,
876 verbose, IsBmp, FALSE) )
877 {
878 if (verbose)
879 wxLogError( _("ICO: Error in reading mask DIB.") );
880 return FALSE;
881 }
882 image->SetMaskFromImage(mask, 255, 255, 255);
883
884 }
885
886 return TRUE;
887 }
888
889 bool wxBMPHandler::LoadFile(wxImage *image, wxInputStream& stream,
890 bool verbose, int WXUNUSED(index))
891 {
892 // Read a single DIB fom the file:
893 return LoadDib(image, stream, verbose, TRUE/*isBmp*/);
894 }
895
896 bool wxBMPHandler::DoCanRead(wxInputStream& stream)
897 {
898 unsigned char hdr[2];
899
900 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
901 return FALSE;
902
903 // do we have the BMP file signature?
904 return hdr[0] == 'B' && hdr[1] == 'M';
905 }
906
907
908 #if wxUSE_ICO_CUR
909 //-----------------------------------------------------------------------------
910 // wxICOHandler
911 //-----------------------------------------------------------------------------
912
913 IMPLEMENT_DYNAMIC_CLASS(wxICOHandler, wxBMPHandler)
914
915 struct ICONDIRENTRY
916 {
917 wxUint8 bWidth; // Width of the image
918 wxUint8 bHeight; // Height of the image (times 2)
919 wxUint8 bColorCount; // Number of colors in image (0 if >=8bpp)
920 wxUint8 bReserved; // Reserved
921
922 // these two are different in icons and cursors:
923 // icon or cursor
924 wxUint16 wPlanes; // Color Planes or XHotSpot
925 wxUint16 wBitCount; // Bits per pixel or YHotSpot
926
927 wxUint32 dwBytesInRes; // how many bytes in this resource?
928 wxUint32 dwImageOffset; // where in the file is this image
929 };
930
931 struct ICONDIR
932 {
933 wxUint16 idReserved; // Reserved
934 wxUint16 idType; // resource type (1 for icons, 2 for cursors)
935 wxUint16 idCount; // how many images?
936 };
937
938
939 bool wxICOHandler::SaveFile(wxImage *image,
940 wxOutputStream& stream,
941 bool verbose)
942
943 {
944 bool bResult = FALSE;
945 //sanity check; icon must be less than 127 pixels high and 255 wide
946 if ( image->GetHeight () > 127 )
947 {
948 if ( verbose )
949 wxLogError(_("ICO: Image too tall for an icon."));
950 return FALSE;
951 }
952 if ( image->GetWidth () > 255 )
953 {
954 if ( verbose )
955 wxLogError(_("ICO: Image too wide for an icon."));
956 return FALSE;
957 }
958
959 int images = 1; // only generate one image
960
961 // VS: This is a hack of sort - since ICO and CUR files are almost
962 // identical, we have all the meat in wxICOHandler and check for
963 // the actual (handler) type when the code has to distinguish between
964 // the two formats
965 int type = (this->GetType() == wxBITMAP_TYPE_CUR) ? 2 : 1;
966
967 // write a header, (ICONDIR)
968 // Calculate the header size
969 wxUint32 offset = 3 * sizeof(wxUint16);
970
971 ICONDIR IconDir;
972 IconDir.idReserved = 0;
973 IconDir.idType = wxUINT16_SWAP_ON_BE(type);
974 IconDir.idCount = wxUINT16_SWAP_ON_BE(images);
975 stream.Write(&IconDir.idReserved, sizeof(IconDir.idReserved));
976 stream.Write(&IconDir.idType, sizeof(IconDir.idType));
977 stream.Write(&IconDir.idCount, sizeof(IconDir.idCount));
978 if ( !stream.IsOk() )
979 {
980 if ( verbose )
981 wxLogError(_("ICO: Error writing the image file!"));
982 return FALSE;
983 }
984
985 // for each iamage write a description ICONDIRENTRY:
986 ICONDIRENTRY icondirentry;
987 for (int i = 0; i < images; i++)
988 {
989 wxImage mask;
990
991 if ( image->HasMask() )
992 {
993 // make another image with black/white:
994 mask = image->ConvertToMono (image->GetMaskRed(), image->GetMaskGreen(), image->GetMaskBlue() );
995
996 // now we need to change the masked regions to black:
997 unsigned char r = image->GetMaskRed();
998 unsigned char g = image->GetMaskGreen();
999 unsigned char b = image->GetMaskBlue();
1000 if ( (r != 0) || (g != 0) || (b != 0) )
1001 {
1002 // Go round and apply black to the masked bits:
1003 int i, j;
1004 for (i = 0; i < mask.GetWidth(); i++)
1005 {
1006 for (j = 0; j < mask.GetHeight(); j++)
1007 {
1008 if ((r == mask.GetRed(i, j)) &&
1009 (g == mask.GetGreen(i, j))&&
1010 (b == mask.GetBlue(i, j)) )
1011 image->SetRGB(i, j, 0, 0, 0 );
1012 }
1013 }
1014 }
1015 }
1016 else
1017 {
1018 // just make a black mask all over:
1019 mask = image->Copy();
1020 int i, j;
1021 for (i = 0; i < mask.GetWidth(); i++)
1022 for (j = 0; j < mask.GetHeight(); j++)
1023 mask.SetRGB(i, j, 0, 0, 0 );
1024 }
1025 // Set the formats for image and mask
1026 // (Windows never saves with more than 8 colors):
1027 image->SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_8BPP);
1028
1029 // monochome bitmap:
1030 mask.SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_1BPP_BW);
1031 bool IsBmp = FALSE;
1032 bool IsMask = FALSE;
1033
1034 //calculate size and offset of image and mask
1035 wxCountingOutputStream cStream;
1036 bResult = SaveDib(image, cStream, verbose, IsBmp, IsMask);
1037 if ( !bResult )
1038 {
1039 if ( verbose )
1040 wxLogError(_("ICO: Error writing the image file!"));
1041 return FALSE;
1042 }
1043 IsMask = TRUE;
1044
1045 bResult = SaveDib(&mask, cStream, verbose, IsBmp, IsMask);
1046 if ( !bResult )
1047 {
1048 if ( verbose )
1049 wxLogError(_("ICO: Error writing the image file!"));
1050 return FALSE;
1051 }
1052 wxUint32 Size = cStream.GetSize();
1053
1054 // wxCountingOutputStream::Ok() always returns TRUE for now and this
1055 // "if" provokes VC++ warnings in optimized build
1056 #if 0
1057 if ( !cStream.Ok() )
1058 {
1059 if ( verbose )
1060 wxLogError(_("ICO: Error writing the image file!"));
1061 return FALSE;
1062 }
1063 #endif // 0
1064
1065 offset = offset + sizeof(ICONDIRENTRY);
1066
1067 icondirentry.bWidth = image->GetWidth();
1068 icondirentry.bHeight = 2 * image->GetHeight();
1069 icondirentry.bColorCount = 0;
1070 icondirentry.bReserved = 0;
1071 icondirentry.wPlanes = wxUINT16_SWAP_ON_BE(1);
1072 icondirentry.wBitCount = wxUINT16_SWAP_ON_BE(wxBMP_8BPP);
1073 if ( type == 2 /*CUR*/)
1074 {
1075 int hx = image->HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) ?
1076 image->GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X) :
1077 image->GetWidth() / 2;
1078 int hy = image->HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) ?
1079 image->GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y) :
1080 image->GetHeight() / 2;
1081
1082 // actually write the values of the hot spot here:
1083 icondirentry.wPlanes = wxUINT16_SWAP_ON_BE((wxUint16)hx);
1084 icondirentry.wBitCount = wxUINT16_SWAP_ON_BE((wxUint16)hy);
1085 }
1086 icondirentry.dwBytesInRes = wxUINT32_SWAP_ON_BE(Size);
1087 icondirentry.dwImageOffset = wxUINT32_SWAP_ON_BE(offset);
1088
1089 // increase size to allow for the data written:
1090 offset += Size;
1091
1092 // write to stream:
1093 stream.Write(&icondirentry.bWidth, sizeof(icondirentry.bWidth));
1094 stream.Write(&icondirentry.bHeight, sizeof(icondirentry.bHeight));
1095 stream.Write(&icondirentry.bColorCount, sizeof(icondirentry.bColorCount));
1096 stream.Write(&icondirentry.bReserved, sizeof(icondirentry.bReserved));
1097 stream.Write(&icondirentry.wPlanes, sizeof(icondirentry.wPlanes));
1098 stream.Write(&icondirentry.wBitCount, sizeof(icondirentry.wBitCount));
1099 stream.Write(&icondirentry.dwBytesInRes, sizeof(icondirentry.dwBytesInRes));
1100 stream.Write(&icondirentry.dwImageOffset, sizeof(icondirentry.dwImageOffset));
1101 if ( !stream.IsOk() )
1102 {
1103 if ( verbose )
1104 wxLogError(_("ICO: Error writing the image file!"));
1105 return FALSE;
1106 }
1107
1108 // actually save it:
1109 IsMask = FALSE;
1110 bResult = SaveDib(image, stream, verbose, IsBmp, IsMask);
1111 if ( !bResult )
1112 {
1113 if ( verbose )
1114 wxLogError(_("ICO: Error writing the image file!"));
1115 return FALSE;
1116 }
1117 IsMask = TRUE;
1118
1119 bResult = SaveDib(&mask, stream, verbose, IsBmp, IsMask);
1120 if ( !bResult )
1121 {
1122 if ( verbose )
1123 wxLogError(_("ICO: Error writing the image file!"));
1124 return FALSE;
1125 }
1126
1127 } // end of for loop
1128
1129 return TRUE;
1130 }
1131
1132 bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream,
1133 bool verbose, int index)
1134 {
1135 stream.SeekI(0);
1136 return DoLoadFile(image, stream, verbose, index);
1137 }
1138
1139 bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
1140 bool WXUNUSED(verbose), int index)
1141 {
1142 bool bResult = FALSE;
1143 bool IsBmp = FALSE;
1144
1145 ICONDIR IconDir;
1146
1147 off_t iPos = stream.TellI();
1148 stream.Read(&IconDir, sizeof(IconDir));
1149 wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
1150 // nType is 1 for Icons, 2 for Cursors:
1151 wxUint16 nType = wxUINT16_SWAP_ON_BE(IconDir.idType);
1152
1153 // loop round the icons and choose the best one:
1154 ICONDIRENTRY *pIconDirEntry = new ICONDIRENTRY[nIcons];
1155 ICONDIRENTRY *pCurrentEntry = pIconDirEntry;
1156 int wMax = 0;
1157 int colmax = 0;
1158 int iSel = wxNOT_FOUND;
1159
1160 for (int i = 0; i < nIcons; i++ )
1161 {
1162 stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY));
1163 // bHeight and bColorCount are wxUint8
1164 if ( pCurrentEntry->bWidth >= wMax )
1165 {
1166 // see if we have more colors, ==0 indicates > 8bpp:
1167 if ( pCurrentEntry->bColorCount == 0 )
1168 pCurrentEntry->bColorCount = 255;
1169 if ( pCurrentEntry->bColorCount >= colmax )
1170 {
1171 iSel = i;
1172 wMax = pCurrentEntry->bWidth;
1173 colmax = pCurrentEntry->bColorCount;
1174 }
1175 }
1176 pCurrentEntry++;
1177 }
1178
1179 if ( index != -1 )
1180 {
1181 // VS: Note that we *have* to run the loop above even if index != -1, because
1182 // it reads ICONDIRENTRies.
1183 iSel = index;
1184 }
1185
1186 if ( iSel == wxNOT_FOUND || iSel < 0 || iSel >= nIcons )
1187 {
1188 wxLogError(_("ICO: Invalid icon index."));
1189 bResult = FALSE;
1190 }
1191 else
1192 {
1193 // seek to selected icon:
1194 pCurrentEntry = pIconDirEntry + iSel;
1195 stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart);
1196 bResult = LoadDib(image, stream, TRUE, IsBmp);
1197 bool bIsCursorType = (this->GetType() == wxBITMAP_TYPE_CUR) || (this->GetType() == wxBITMAP_TYPE_ANI);
1198 if ( bResult && bIsCursorType && nType == 2 )
1199 {
1200 // it is a cursor, so let's set the hotspot:
1201 image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, wxUINT16_SWAP_ON_BE(pCurrentEntry->wPlanes));
1202 image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, wxUINT16_SWAP_ON_BE(pCurrentEntry->wBitCount));
1203 }
1204 }
1205 delete[] pIconDirEntry;
1206 return bResult;
1207 }
1208
1209 int wxICOHandler::GetImageCount(wxInputStream& stream)
1210 {
1211 ICONDIR IconDir;
1212 off_t iPos = stream.TellI();
1213 stream.SeekI(0);
1214 stream.Read(&IconDir, sizeof(IconDir));
1215 wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
1216 stream.SeekI(iPos);
1217 return (int)nIcons;
1218 }
1219
1220 bool wxICOHandler::DoCanRead(wxInputStream& stream)
1221 {
1222 stream.SeekI(0);
1223 unsigned char hdr[4];
1224 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
1225 return FALSE;
1226
1227 // hdr[2] is one for an icon and two for a cursor
1228 return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\1' && hdr[3] == '\0';
1229 }
1230
1231
1232
1233 //-----------------------------------------------------------------------------
1234 // wxCURHandler
1235 //-----------------------------------------------------------------------------
1236
1237 IMPLEMENT_DYNAMIC_CLASS(wxCURHandler, wxICOHandler)
1238
1239 bool wxCURHandler::DoCanRead(wxInputStream& stream)
1240 {
1241 stream.SeekI(0);
1242 unsigned char hdr[4];
1243 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
1244 return FALSE;
1245
1246 // hdr[2] is one for an icon and two for a cursor
1247 return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\2' && hdr[3] == '\0';
1248 }
1249
1250 //-----------------------------------------------------------------------------
1251 // wxANIHandler
1252 //-----------------------------------------------------------------------------
1253
1254 IMPLEMENT_DYNAMIC_CLASS(wxANIHandler, wxCURHandler)
1255
1256 bool wxANIHandler::LoadFile(wxImage *image, wxInputStream& stream,
1257 bool verbose, int index)
1258 {
1259 wxInt32 FCC1, FCC2;
1260 wxUint32 datalen;
1261 static const char *rifftxt = "RIFF";
1262 static const char *listtxt = "LIST";
1263 static const char *icotxt = "icon";
1264
1265 wxInt32 riff32 = (wxInt32) rifftxt;
1266 wxInt32 list32 = (wxInt32) listtxt;
1267 wxInt32 ico32 = (wxInt32) icotxt;
1268
1269 int iIcon = 0;
1270
1271 stream.SeekI(0);
1272 stream.Read(&FCC1, 4);
1273 if ( FCC1 != riff32 )
1274 return FALSE;
1275
1276 // we have a riff file:
1277 while (stream.IsOk())
1278 {
1279 // we always have a data size
1280 stream.Read(&datalen, 4);
1281 datalen = wxINT32_SWAP_ON_BE(datalen) ;
1282 //data should be padded to make even number of bytes
1283 if (datalen % 2 == 1) datalen ++ ;
1284 //now either data or a FCC
1285 if ( (FCC1 == riff32) || (FCC1 == list32) )
1286 {
1287 stream.Read(&FCC2, 4);
1288 }
1289 else
1290 {
1291 if (FCC1 == ico32 && iIcon >= index)
1292 {
1293 return DoLoadFile(image, stream, verbose, -1);
1294 }
1295 else
1296 {
1297 stream.SeekI(stream.TellI() + datalen);
1298 if ( FCC1 == ico32 )
1299 iIcon ++;
1300 }
1301 }
1302
1303 // try to read next data chunk:
1304 stream.Read(&FCC1, 4);
1305 }
1306 return FALSE;
1307 }
1308
1309 bool wxANIHandler::DoCanRead(wxInputStream& stream)
1310 {
1311 wxInt32 FCC1, FCC2;
1312 wxUint32 datalen ;
1313 static const char *rifftxt = "RIFF";
1314 static const char *listtxt = "LIST";
1315 static const char *anihtxt = "anih";
1316
1317 wxInt32 riff32 = (wxInt32) rifftxt;
1318 wxInt32 list32 = (wxInt32) listtxt;
1319 wxInt32 anih32 = (wxInt32) anihtxt;
1320
1321 stream.SeekI(0);
1322 if ( !stream.Read(&FCC1, 4) )
1323 return FALSE;
1324
1325 if ( FCC1 != riff32 )
1326 return FALSE;
1327
1328 // we have a riff file:
1329 while ( stream.IsOk() )
1330 {
1331 if ( FCC1 == anih32 )
1332 return TRUE;
1333 // we always have a data size:
1334 stream.Read(&datalen, 4);
1335 datalen = wxINT32_SWAP_ON_BE(datalen) ;
1336 //data should be padded to make even number of bytes
1337 if (datalen % 2 == 1) datalen ++ ;
1338 // now either data or a FCC:
1339 if ( (FCC1 == riff32) || (FCC1 == list32) )
1340 {
1341 stream.Read(&FCC2, 4);
1342 }
1343 else
1344 {
1345 stream.SeekI(stream.TellI() + datalen);
1346 }
1347
1348 // try to read next data chunk:
1349 if ( !stream.Read(&FCC1, 4) )
1350 {
1351 // reading failed -- either EOF or IO error, bail out anyhow
1352 return FALSE;
1353 }
1354 }
1355
1356 return FALSE;
1357 }
1358
1359 int wxANIHandler::GetImageCount(wxInputStream& stream)
1360 {
1361 wxInt32 FCC1, FCC2;
1362 wxUint32 datalen ;
1363 static const char *rifftxt = "RIFF";
1364 static const char *listtxt = "LIST";
1365 static const char *anihtxt = "anih";
1366
1367 wxInt32 riff32 = (wxInt32) rifftxt;
1368 wxInt32 list32 = (wxInt32) listtxt;
1369 wxInt32 anih32 = (wxInt32) anihtxt;
1370
1371 stream.SeekI(0);
1372 stream.Read(&FCC1, 4);
1373 if ( FCC1 != riff32 )
1374 return wxNOT_FOUND;
1375
1376 // we have a riff file:
1377 while ( stream.IsOk() )
1378 {
1379 // we always have a data size:
1380 stream.Read(&datalen, 4);
1381 datalen = wxINT32_SWAP_ON_BE(datalen) ;
1382 //data should be padded to make even number of bytes
1383 if (datalen % 2 == 1) datalen ++ ;
1384 // now either data or a FCC:
1385 if ( (FCC1 == riff32) || (FCC1 == list32) )
1386 {
1387 stream.Read(&FCC2, 4);
1388 }
1389 else
1390 {
1391 if ( FCC1 == anih32 )
1392 {
1393 wxUint32 *pData = new wxUint32[datalen/4];
1394 stream.Read(pData, datalen);
1395 int nIcons = wxINT32_SWAP_ON_BE(*(pData + 1));
1396 delete[] pData;
1397 return nIcons;
1398 }
1399 else
1400 stream.SeekI(stream.TellI() + datalen);
1401 }
1402
1403 // try to read next data chunk:
1404 stream.Read(&FCC1, 4);
1405 }
1406
1407 return wxNOT_FOUND;
1408 }
1409
1410 #endif // wxUSE_ICO_CUR
1411
1412 #endif // wxUSE_IMAGE && wxUSE_STREAMS
wxWidgets (Impactor)