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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 wxUint8 first;
635 first = aByte;
636 aByte = stream.GetC();
637 if ( first == 0 )
638 {
639 if ( aByte == 0 )
640 {
641 if ( column > 0 )
642 column = width;
643 }
644 else if ( aByte == 1 )
645 {
646 column = width;
647 line = -1;
648 }
649 else if ( aByte == 2 )
650 {
651 aByte = stream.GetC();
652 column += aByte;
653 linepos = column * bpp / 4;
654 aByte = stream.GetC();
655 line -= aByte; // upside down
656 }
657 else
658 {
659 int absolute = aByte;
660 wxUint8 nibble[2] ;
661 int readBytes = 0 ;
662 for (int k = 0; k < absolute; k++)
663 {
664 if ( !(k % 2 ) )
665 {
666 ++readBytes ;
667 aByte = stream.GetC();
668 nibble[0] = ( (aByte & 0xF0) >> 4 ) ;
669 nibble[1] = ( aByte & 0x0F ) ;
670 }
671 ptr[poffset ] = cmap[nibble[k%2]].r;
672 ptr[poffset + 1] = cmap[nibble[k%2]].g;
673 ptr[poffset + 2] = cmap[nibble[k%2]].b;
674 column++;
675 if ( k % 2 )
676 linepos++;
677 }
678 if ( readBytes & 0x01 )
679 aByte = stream.GetC();
680 }
681 }
682 else
683 {
684 wxUint8 nibble[2] ;
685 nibble[0] = ( (aByte & 0xF0) >> 4 ) ;
686 nibble[1] = ( aByte & 0x0F ) ;
687
688 for ( int l = 0; l < first && column < width; l++ )
689 {
690 ptr[poffset ] = cmap[nibble[l%2]].r;
691 ptr[poffset + 1] = cmap[nibble[l%2]].g;
692 ptr[poffset + 2] = cmap[nibble[l%2]].b;
693 column++;
694 if ( l % 2 )
695 linepos++;
696 }
697 }
698 }
699 else
700 {
701 int nibble = 0;
702 for (nibble = 0; nibble < 2 && column < width; nibble++)
703 {
704 index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
705 if ( index >= 16 )
706 index = 15;
707 ptr[poffset] = cmap[index].r;
708 ptr[poffset + 1] = cmap[index].g;
709 ptr[poffset + 2] = cmap[index].b;
710 column++;
711 }
712 }
713 }
714 else if ( bpp == 8 )
715 {
716 if ( comp == BI_RLE8 )
717 {
718 unsigned char first;
719 first = aByte;
720 aByte = stream.GetC();
721 if ( first == 0 )
722 {
723 if ( aByte == 0 )
724 {
725 /* column = width; */
726 }
727 else if ( aByte == 1 )
728 {
729 column = width;
730 line = -1;
731 }
732 else if ( aByte == 2 )
733 {
734 aByte = stream.GetC();
735 column += aByte;
736 linepos = column * bpp / 8;
737 aByte = stream.GetC();
738 line += aByte;
739 }
740 else
741 {
742 int absolute = aByte;
743 for (int k = 0; k < absolute; k++)
744 {
745 linepos++;
746 aByte = stream.GetC();
747 ptr[poffset ] = cmap[aByte].r;
748 ptr[poffset + 1] = cmap[aByte].g;
749 ptr[poffset + 2] = cmap[aByte].b;
750 column++;
751 }
752 if ( absolute & 0x01 )
753 aByte = stream.GetC();
754 }
755 }
756 else
757 {
758 for ( int l = 0; l < first && column < width; l++ )
759 {
760 ptr[poffset ] = cmap[aByte].r;
761 ptr[poffset + 1] = cmap[aByte].g;
762 ptr[poffset + 2] = cmap[aByte].b;
763 column++;
764 linepos++;
765 }
766 }
767 }
768 else
769 {
770 ptr[poffset ] = cmap[aByte].r;
771 ptr[poffset + 1] = cmap[aByte].g;
772 ptr[poffset + 2] = cmap[aByte].b;
773 column++;
774 // linepos += size; seems to be wrong, RR
775 }
776 }
777 }
778 else if ( bpp == 24 )
779 {
780 stream.Read(bbuf, 3);
781 linepos += 3;
782 ptr[poffset ] = (unsigned char)bbuf[2];
783 ptr[poffset + 1] = (unsigned char)bbuf[1];
784 ptr[poffset + 2] = (unsigned char)bbuf[0];
785 column++;
786 }
787 else if ( bpp == 16 )
788 {
789 unsigned char temp;
790 stream.Read(&aWord, 2);
791 aWord = wxUINT16_SWAP_ON_BE(aWord);
792 linepos += 2;
793 /* use the masks and calculated amonut of shift
794 to retrieve the color data out of the word. Then
795 shift it left by (8 - number of bits) such that
796 the image has the proper dynamic range */
797 temp = (aWord & rmask) >> rshift << (8-rbits);
798 ptr[poffset] = temp;
799 temp = (aWord & gmask) >> gshift << (8-gbits);
800 ptr[poffset + 1] = temp;
801 temp = (aWord & bmask) >> bshift << (8-bbits);
802 ptr[poffset + 2] = temp;
803 column++;
804 }
805 else
806 {
807 unsigned char temp;
808 stream.Read(&aDword, 4);
809 aDword = wxINT32_SWAP_ON_BE(aDword);
810 linepos += 4;
811 temp = (aDword & rmask) >> rshift;
812 ptr[poffset] = temp;
813 temp = (aDword & gmask) >> gshift;
814 ptr[poffset + 1] = temp;
815 temp = (aDword & bmask) >> bshift;
816 ptr[poffset + 2] = temp;
817 column++;
818 }
819 }
820 while ( (linepos < linesize) && (comp != 1) && (comp != 2) )
821 {
822 stream.Read(&aByte, 1);
823 linepos += 1;
824 if ( !stream )
825 break;
826 }
827 }
828
829 delete[] cmap;
830
831 image->SetMask(FALSE);
832
833 const wxStreamError err = stream.GetLastError();
834 return err == wxSTREAM_NO_ERROR || err == wxSTREAM_EOF;
835 }
836
837 bool wxBMPHandler::LoadDib(wxImage *image, wxInputStream& stream,
838 bool verbose, bool IsBmp)
839 {
840 wxUint16 aWord;
841 wxInt32 dbuf[4];
842 wxInt8 bbuf[4];
843 off_t offset;
844
845 offset = 0; // keep gcc quiet
846 if ( IsBmp )
847 {
848 // read the header off the .BMP format file
849
850 offset = stream.TellI();
851 if (offset == wxInvalidOffset) offset = 0;
852
853 stream.Read(bbuf, 2);
854 stream.Read(dbuf, 16);
855 }
856 else
857 {
858 stream.Read(dbuf, 4);
859 }
860 #if 0 // unused
861 wxInt32 size = wxINT32_SWAP_ON_BE(dbuf[0]);
862 #endif
863 offset = offset + wxINT32_SWAP_ON_BE(dbuf[2]);
864
865 stream.Read(dbuf, 4 * 2);
866 int width = (int)wxINT32_SWAP_ON_BE(dbuf[0]);
867 int height = (int)wxINT32_SWAP_ON_BE(dbuf[1]);
868 if ( !IsBmp)height = height / 2; // for icons divide by 2
869
870 if ( width > 32767 )
871 {
872 if (verbose)
873 wxLogError( _("DIB Header: Image width > 32767 pixels for file.") );
874 return FALSE;
875 }
876 if ( height > 32767 )
877 {
878 if (verbose)
879 wxLogError( _("DIB Header: Image height > 32767 pixels for file.") );
880 return FALSE;
881 }
882
883 stream.Read(&aWord, 2);
884 /*
885 TODO
886 int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
887 */
888 stream.Read(&aWord, 2);
889 int bpp = (int)wxUINT16_SWAP_ON_BE(aWord);
890 if ( bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32 )
891 {
892 if (verbose)
893 wxLogError( _("DIB Header: Unknown bitdepth in file.") );
894 return FALSE;
895 }
896
897 stream.Read(dbuf, 4 * 4);
898 int comp = (int)wxINT32_SWAP_ON_BE(dbuf[0]);
899 if ( comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 &&
900 comp != BI_BITFIELDS )
901 {
902 if (verbose)
903 wxLogError( _("DIB Header: Unknown encoding in file.") );
904 return FALSE;
905 }
906
907 stream.Read(dbuf, 4 * 2);
908 int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
909 if (ncolors == 0)
910 ncolors = 1 << bpp;
911 /* some more sanity checks */
912 if (((comp == BI_RLE4) && (bpp != 4)) ||
913 ((comp == BI_RLE8) && (bpp != 8)) ||
914 ((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
915 {
916 if (verbose)
917 wxLogError( _("DIB Header: Encoding doesn't match bitdepth.") );
918 return FALSE;
919 }
920
921 //read DIB; this is the BMP image or the XOR part of an icon image
922 if ( !DoLoadDib(image, width, height, bpp, ncolors, comp, offset, stream,
923 verbose, IsBmp, TRUE) )
924 {
925 if (verbose)
926 wxLogError( _("Error in reading image DIB .") );
927 return FALSE;
928 }
929
930 if ( !IsBmp )
931 {
932 //read Icon mask which is monochrome
933 //there is no palette, so we will create one
934 wxImage mask;
935 if ( !DoLoadDib(&mask, width, height, 1, 2, BI_RGB, offset, stream,
936 verbose, IsBmp, FALSE) )
937 {
938 if (verbose)
939 wxLogError( _("ICO: Error in reading mask DIB.") );
940 return FALSE;
941 }
942 image->SetMaskFromImage(mask, 255, 255, 255);
943
944 }
945
946 return TRUE;
947 }
948
949 bool wxBMPHandler::LoadFile(wxImage *image, wxInputStream& stream,
950 bool verbose, int WXUNUSED(index))
951 {
952 // Read a single DIB fom the file:
953 return LoadDib(image, stream, verbose, TRUE/*isBmp*/);
954 }
955
956 bool wxBMPHandler::DoCanRead(wxInputStream& stream)
957 {
958 unsigned char hdr[2];
959
960 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
961 return FALSE;
962
963 // do we have the BMP file signature?
964 return hdr[0] == 'B' && hdr[1] == 'M';
965 }
966
967
968 #if wxUSE_ICO_CUR
969 //-----------------------------------------------------------------------------
970 // wxICOHandler
971 //-----------------------------------------------------------------------------
972
973 IMPLEMENT_DYNAMIC_CLASS(wxICOHandler, wxBMPHandler)
974
975 struct ICONDIRENTRY
976 {
977 wxUint8 bWidth; // Width of the image
978 wxUint8 bHeight; // Height of the image (times 2)
979 wxUint8 bColorCount; // Number of colors in image (0 if >=8bpp)
980 wxUint8 bReserved; // Reserved
981
982 // these two are different in icons and cursors:
983 // icon or cursor
984 wxUint16 wPlanes; // Color Planes or XHotSpot
985 wxUint16 wBitCount; // Bits per pixel or YHotSpot
986
987 wxUint32 dwBytesInRes; // how many bytes in this resource?
988 wxUint32 dwImageOffset; // where in the file is this image
989 };
990
991 struct ICONDIR
992 {
993 wxUint16 idReserved; // Reserved
994 wxUint16 idType; // resource type (1 for icons, 2 for cursors)
995 wxUint16 idCount; // how many images?
996 };
997
998
999 bool wxICOHandler::SaveFile(wxImage *image,
1000 wxOutputStream& stream,
1001 bool verbose)
1002
1003 {
1004 bool bResult = FALSE;
1005 //sanity check; icon must be less than 127 pixels high and 255 wide
1006 if ( image->GetHeight () > 127 )
1007 {
1008 if ( verbose )
1009 wxLogError(_("ICO: Image too tall for an icon."));
1010 return FALSE;
1011 }
1012 if ( image->GetWidth () > 255 )
1013 {
1014 if ( verbose )
1015 wxLogError(_("ICO: Image too wide for an icon."));
1016 return FALSE;
1017 }
1018
1019 int images = 1; // only generate one image
1020
1021 // VS: This is a hack of sort - since ICO and CUR files are almost
1022 // identical, we have all the meat in wxICOHandler and check for
1023 // the actual (handler) type when the code has to distinguish between
1024 // the two formats
1025 int type = (this->GetType() == wxBITMAP_TYPE_CUR) ? 2 : 1;
1026
1027 // write a header, (ICONDIR)
1028 // Calculate the header size
1029 wxUint32 offset = 3 * sizeof(wxUint16);
1030
1031 ICONDIR IconDir;
1032 IconDir.idReserved = 0;
1033 IconDir.idType = wxUINT16_SWAP_ON_BE(type);
1034 IconDir.idCount = wxUINT16_SWAP_ON_BE(images);
1035 stream.Write(&IconDir.idReserved, sizeof(IconDir.idReserved));
1036 stream.Write(&IconDir.idType, sizeof(IconDir.idType));
1037 stream.Write(&IconDir.idCount, sizeof(IconDir.idCount));
1038 if ( !stream.IsOk() )
1039 {
1040 if ( verbose )
1041 wxLogError(_("ICO: Error writing the image file!"));
1042 return FALSE;
1043 }
1044
1045 // for each iamage write a description ICONDIRENTRY:
1046 ICONDIRENTRY icondirentry;
1047 for (int i = 0; i < images; i++)
1048 {
1049 wxImage mask;
1050
1051 if ( image->HasMask() )
1052 {
1053 // make another image with black/white:
1054 mask = image->ConvertToMono (image->GetMaskRed(), image->GetMaskGreen(), image->GetMaskBlue() );
1055
1056 // now we need to change the masked regions to black:
1057 unsigned char r = image->GetMaskRed();
1058 unsigned char g = image->GetMaskGreen();
1059 unsigned char b = image->GetMaskBlue();
1060 if ( (r != 0) || (g != 0) || (b != 0) )
1061 {
1062 // Go round and apply black to the masked bits:
1063 int i, j;
1064 for (i = 0; i < mask.GetWidth(); i++)
1065 {
1066 for (j = 0; j < mask.GetHeight(); j++)
1067 {
1068 if ((r == mask.GetRed(i, j)) &&
1069 (g == mask.GetGreen(i, j))&&
1070 (b == mask.GetBlue(i, j)) )
1071 image->SetRGB(i, j, 0, 0, 0 );
1072 }
1073 }
1074 }
1075 }
1076 else
1077 {
1078 // just make a black mask all over:
1079 mask = image->Copy();
1080 int i, j;
1081 for (i = 0; i < mask.GetWidth(); i++)
1082 for (j = 0; j < mask.GetHeight(); j++)
1083 mask.SetRGB(i, j, 0, 0, 0 );
1084 }
1085 // Set the formats for image and mask
1086 // (Windows never saves with more than 8 colors):
1087 image->SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_8BPP);
1088
1089 // monochome bitmap:
1090 mask.SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_1BPP_BW);
1091 bool IsBmp = FALSE;
1092 bool IsMask = FALSE;
1093
1094 //calculate size and offset of image and mask
1095 wxCountingOutputStream cStream;
1096 bResult = SaveDib(image, cStream, verbose, IsBmp, IsMask);
1097 if ( !bResult )
1098 {
1099 if ( verbose )
1100 wxLogError(_("ICO: Error writing the image file!"));
1101 return FALSE;
1102 }
1103 IsMask = TRUE;
1104
1105 bResult = SaveDib(&mask, cStream, verbose, IsBmp, IsMask);
1106 if ( !bResult )
1107 {
1108 if ( verbose )
1109 wxLogError(_("ICO: Error writing the image file!"));
1110 return FALSE;
1111 }
1112 wxUint32 Size = cStream.GetSize();
1113
1114 // wxCountingOutputStream::Ok() always returns TRUE for now and this
1115 // "if" provokes VC++ warnings in optimized build
1116 #if 0
1117 if ( !cStream.Ok() )
1118 {
1119 if ( verbose )
1120 wxLogError(_("ICO: Error writing the image file!"));
1121 return FALSE;
1122 }
1123 #endif // 0
1124
1125 offset = offset + sizeof(ICONDIRENTRY);
1126
1127 icondirentry.bWidth = image->GetWidth();
1128 icondirentry.bHeight = 2 * image->GetHeight();
1129 icondirentry.bColorCount = 0;
1130 icondirentry.bReserved = 0;
1131 icondirentry.wPlanes = wxUINT16_SWAP_ON_BE(1);
1132 icondirentry.wBitCount = wxUINT16_SWAP_ON_BE(wxBMP_8BPP);
1133 if ( type == 2 /*CUR*/)
1134 {
1135 int hx = image->HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) ?
1136 image->GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X) :
1137 image->GetWidth() / 2;
1138 int hy = image->HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) ?
1139 image->GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y) :
1140 image->GetHeight() / 2;
1141
1142 // actually write the values of the hot spot here:
1143 icondirentry.wPlanes = wxUINT16_SWAP_ON_BE((wxUint16)hx);
1144 icondirentry.wBitCount = wxUINT16_SWAP_ON_BE((wxUint16)hy);
1145 }
1146 icondirentry.dwBytesInRes = wxUINT32_SWAP_ON_BE(Size);
1147 icondirentry.dwImageOffset = wxUINT32_SWAP_ON_BE(offset);
1148
1149 // increase size to allow for the data written:
1150 offset += Size;
1151
1152 // write to stream:
1153 stream.Write(&icondirentry.bWidth, sizeof(icondirentry.bWidth));
1154 stream.Write(&icondirentry.bHeight, sizeof(icondirentry.bHeight));
1155 stream.Write(&icondirentry.bColorCount, sizeof(icondirentry.bColorCount));
1156 stream.Write(&icondirentry.bReserved, sizeof(icondirentry.bReserved));
1157 stream.Write(&icondirentry.wPlanes, sizeof(icondirentry.wPlanes));
1158 stream.Write(&icondirentry.wBitCount, sizeof(icondirentry.wBitCount));
1159 stream.Write(&icondirentry.dwBytesInRes, sizeof(icondirentry.dwBytesInRes));
1160 stream.Write(&icondirentry.dwImageOffset, sizeof(icondirentry.dwImageOffset));
1161 if ( !stream.IsOk() )
1162 {
1163 if ( verbose )
1164 wxLogError(_("ICO: Error writing the image file!"));
1165 return FALSE;
1166 }
1167
1168 // actually save it:
1169 IsMask = FALSE;
1170 bResult = SaveDib(image, stream, verbose, IsBmp, IsMask);
1171 if ( !bResult )
1172 {
1173 if ( verbose )
1174 wxLogError(_("ICO: Error writing the image file!"));
1175 return FALSE;
1176 }
1177 IsMask = TRUE;
1178
1179 bResult = SaveDib(&mask, stream, verbose, IsBmp, IsMask);
1180 if ( !bResult )
1181 {
1182 if ( verbose )
1183 wxLogError(_("ICO: Error writing the image file!"));
1184 return FALSE;
1185 }
1186
1187 } // end of for loop
1188
1189 return TRUE;
1190 }
1191
1192 bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream,
1193 bool verbose, int index)
1194 {
1195 stream.SeekI(0);
1196 return DoLoadFile(image, stream, verbose, index);
1197 }
1198
1199 bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
1200 bool WXUNUSED(verbose), int index)
1201 {
1202 bool bResult = FALSE;
1203 bool IsBmp = FALSE;
1204
1205 ICONDIR IconDir;
1206
1207 off_t iPos = stream.TellI();
1208 stream.Read(&IconDir, sizeof(IconDir));
1209 wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
1210 // nType is 1 for Icons, 2 for Cursors:
1211 wxUint16 nType = wxUINT16_SWAP_ON_BE(IconDir.idType);
1212
1213 // loop round the icons and choose the best one:
1214 ICONDIRENTRY *pIconDirEntry = new ICONDIRENTRY[nIcons];
1215 ICONDIRENTRY *pCurrentEntry = pIconDirEntry;
1216 int wMax = 0;
1217 int colmax = 0;
1218 int iSel = wxNOT_FOUND;
1219
1220 for (int i = 0; i < nIcons; i++ )
1221 {
1222 stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY));
1223 // bHeight and bColorCount are wxUint8
1224 if ( pCurrentEntry->bWidth >= wMax )
1225 {
1226 // see if we have more colors, ==0 indicates > 8bpp:
1227 if ( pCurrentEntry->bColorCount == 0 )
1228 pCurrentEntry->bColorCount = 255;
1229 if ( pCurrentEntry->bColorCount >= colmax )
1230 {
1231 iSel = i;
1232 wMax = pCurrentEntry->bWidth;
1233 colmax = pCurrentEntry->bColorCount;
1234 }
1235 }
1236 pCurrentEntry++;
1237 }
1238
1239 if ( index != -1 )
1240 {
1241 // VS: Note that we *have* to run the loop above even if index != -1, because
1242 // it reads ICONDIRENTRies.
1243 iSel = index;
1244 }
1245
1246 if ( iSel == wxNOT_FOUND || iSel < 0 || iSel >= nIcons )
1247 {
1248 wxLogError(_("ICO: Invalid icon index."));
1249 bResult = FALSE;
1250 }
1251 else
1252 {
1253 // seek to selected icon:
1254 pCurrentEntry = pIconDirEntry + iSel;
1255 stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart);
1256 bResult = LoadDib(image, stream, TRUE, IsBmp);
1257 bool bIsCursorType = (this->GetType() == wxBITMAP_TYPE_CUR) || (this->GetType() == wxBITMAP_TYPE_ANI);
1258 if ( bResult && bIsCursorType && nType == 2 )
1259 {
1260 // it is a cursor, so let's set the hotspot:
1261 image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, wxUINT16_SWAP_ON_BE(pCurrentEntry->wPlanes));
1262 image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, wxUINT16_SWAP_ON_BE(pCurrentEntry->wBitCount));
1263 }
1264 }
1265 delete[] pIconDirEntry;
1266 return bResult;
1267 }
1268
1269 int wxICOHandler::GetImageCount(wxInputStream& stream)
1270 {
1271 ICONDIR IconDir;
1272 off_t iPos = stream.TellI();
1273 stream.SeekI(0);
1274 stream.Read(&IconDir, sizeof(IconDir));
1275 wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
1276 stream.SeekI(iPos);
1277 return (int)nIcons;
1278 }
1279
1280 bool wxICOHandler::DoCanRead(wxInputStream& stream)
1281 {
1282 stream.SeekI(0);
1283 unsigned char hdr[4];
1284 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
1285 return FALSE;
1286
1287 // hdr[2] is one for an icon and two for a cursor
1288 return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\1' && hdr[3] == '\0';
1289 }
1290
1291
1292
1293 //-----------------------------------------------------------------------------
1294 // wxCURHandler
1295 //-----------------------------------------------------------------------------
1296
1297 IMPLEMENT_DYNAMIC_CLASS(wxCURHandler, wxICOHandler)
1298
1299 bool wxCURHandler::DoCanRead(wxInputStream& stream)
1300 {
1301 stream.SeekI(0);
1302 unsigned char hdr[4];
1303 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
1304 return FALSE;
1305
1306 // hdr[2] is one for an icon and two for a cursor
1307 return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\2' && hdr[3] == '\0';
1308 }
1309
1310 //-----------------------------------------------------------------------------
1311 // wxANIHandler
1312 //-----------------------------------------------------------------------------
1313
1314 IMPLEMENT_DYNAMIC_CLASS(wxANIHandler, wxCURHandler)
1315
1316 bool wxANIHandler::LoadFile(wxImage *image, wxInputStream& stream,
1317 bool verbose, int index)
1318 {
1319 wxInt32 FCC1, FCC2;
1320 wxUint32 datalen;
1321
1322 wxInt32 riff32;
1323 memcpy( &riff32, "RIFF", 4 );
1324 wxInt32 list32;
1325 memcpy( &list32, "LIST", 4 );
1326 wxInt32 ico32;
1327 memcpy( &ico32, "icon", 4 );
1328 int iIcon = 0;
1329
1330 stream.SeekI(0);
1331 stream.Read(&FCC1, 4);
1332 if ( FCC1 != riff32 )
1333 return FALSE;
1334
1335 // we have a riff file:
1336 while (stream.IsOk())
1337 {
1338 // we always have a data size
1339 stream.Read(&datalen, 4);
1340 datalen = wxINT32_SWAP_ON_BE(datalen) ;
1341 //data should be padded to make even number of bytes
1342 if (datalen % 2 == 1) datalen ++ ;
1343 //now either data or a FCC
1344 if ( (FCC1 == riff32) || (FCC1 == list32) )
1345 {
1346 stream.Read(&FCC2, 4);
1347 }
1348 else
1349 {
1350 if (FCC1 == ico32 && iIcon >= index)
1351 {
1352 return DoLoadFile(image, stream, verbose, -1);
1353 }
1354 else
1355 {
1356 stream.SeekI(stream.TellI() + datalen);
1357 if ( FCC1 == ico32 )
1358 iIcon ++;
1359 }
1360 }
1361
1362 // try to read next data chunk:
1363 stream.Read(&FCC1, 4);
1364 }
1365 return FALSE;
1366 }
1367
1368 bool wxANIHandler::DoCanRead(wxInputStream& stream)
1369 {
1370 wxInt32 FCC1, FCC2;
1371 wxUint32 datalen ;
1372
1373 wxInt32 riff32;
1374 memcpy( &riff32, "RIFF", 4 );
1375 wxInt32 list32;
1376 memcpy( &list32, "LIST", 4 );
1377 wxInt32 ico32;
1378 memcpy( &ico32, "icon", 4 );
1379 wxInt32 anih32;
1380 memcpy( &anih32, "anih", 4 );
1381
1382 stream.SeekI(0);
1383 if ( !stream.Read(&FCC1, 4) )
1384 return FALSE;
1385
1386 if ( FCC1 != riff32 )
1387 return FALSE;
1388
1389 // we have a riff file:
1390 while ( stream.IsOk() )
1391 {
1392 if ( FCC1 == anih32 )
1393 return TRUE;
1394 // we always have a data size:
1395 stream.Read(&datalen, 4);
1396 datalen = wxINT32_SWAP_ON_BE(datalen) ;
1397 //data should be padded to make even number of bytes
1398 if (datalen % 2 == 1) datalen ++ ;
1399 // now either data or a FCC:
1400 if ( (FCC1 == riff32) || (FCC1 == list32) )
1401 {
1402 stream.Read(&FCC2, 4);
1403 }
1404 else
1405 {
1406 stream.SeekI(stream.TellI() + datalen);
1407 }
1408
1409 // try to read next data chunk:
1410 if ( !stream.Read(&FCC1, 4) )
1411 {
1412 // reading failed -- either EOF or IO error, bail out anyhow
1413 return FALSE;
1414 }
1415 }
1416
1417 return FALSE;
1418 }
1419
1420 int wxANIHandler::GetImageCount(wxInputStream& stream)
1421 {
1422 wxInt32 FCC1, FCC2;
1423 wxUint32 datalen ;
1424
1425 wxInt32 riff32;
1426 memcpy( &riff32, "RIFF", 4 );
1427 wxInt32 list32;
1428 memcpy( &list32, "LIST", 4 );
1429 wxInt32 ico32;
1430 memcpy( &ico32, "icon", 4 );
1431 wxInt32 anih32;
1432 memcpy( &anih32, "anih", 4 );
1433
1434 stream.SeekI(0);
1435 stream.Read(&FCC1, 4);
1436 if ( FCC1 != riff32 )
1437 return wxNOT_FOUND;
1438
1439 // we have a riff file:
1440 while ( stream.IsOk() )
1441 {
1442 // we always have a data size:
1443 stream.Read(&datalen, 4);
1444 datalen = wxINT32_SWAP_ON_BE(datalen) ;
1445 //data should be padded to make even number of bytes
1446 if (datalen % 2 == 1) datalen ++ ;
1447 // now either data or a FCC:
1448 if ( (FCC1 == riff32) || (FCC1 == list32) )
1449 {
1450 stream.Read(&FCC2, 4);
1451 }
1452 else
1453 {
1454 if ( FCC1 == anih32 )
1455 {
1456 wxUint32 *pData = new wxUint32[datalen/4];
1457 stream.Read(pData, datalen);
1458 int nIcons = wxINT32_SWAP_ON_BE(*(pData + 1));
1459 delete[] pData;
1460 return nIcons;
1461 }
1462 else
1463 stream.SeekI(stream.TellI() + datalen);
1464 }
1465
1466 // try to read next data chunk:
1467 stream.Read(&FCC1, 4);
1468 }
1469
1470 return wxNOT_FOUND;
1471 }
1472
1473 #endif // wxUSE_ICO_CUR
1474
1475 #endif // wxUSE_IMAGE && wxUSE_STREAMS
wxWidgets (Impactor)