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[wxWidgets.git] / src / common / imagbmp.cpp
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/common/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 // For compilers that support precompilation, includes "wx.h".
11 #include "wx/wxprec.h"
12
13 #ifdef __BORLANDC__
14 #pragma hdrstop
15 #endif
16
17 #if wxUSE_IMAGE
18
19 #include "wx/imagbmp.h"
20
21 #ifndef WX_PRECOMP
22 #ifdef __WXMSW__
23 #include "wx/msw/wrapwin.h"
24 #endif
25 #include "wx/log.h"
26 #include "wx/app.h"
27 #include "wx/bitmap.h"
28 #include "wx/palette.h"
29 #include "wx/intl.h"
30 #include "wx/math.h"
31 #endif
32
33 #include "wx/filefn.h"
34 #include "wx/wfstream.h"
35 #include "wx/quantize.h"
36 #include "wx/scopeguard.h"
37 #include "wx/anidecod.h"
38
39 // For memcpy
40 #include <string.h>
41
42 //-----------------------------------------------------------------------------
43 // wxBMPHandler
44 //-----------------------------------------------------------------------------
45
46 IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler)
47
48 #if wxUSE_STREAMS
49
50 #ifndef BI_RGB
51 #define BI_RGB 0
52 #endif
53
54 #ifndef BI_RLE8
55 #define BI_RLE8 1
56 #endif
57
58 #ifndef BI_RLE4
59 #define BI_RLE4 2
60 #endif
61
62 #ifndef BI_BITFIELDS
63 #define BI_BITFIELDS 3
64 #endif
65
66 #define poffset (line * width * 3 + column * 3)
67
68 bool wxBMPHandler::SaveFile(wxImage *image,
69 wxOutputStream& stream,
70 bool verbose)
71 {
72 return SaveDib(image, stream, verbose, true/*IsBmp*/, false/*IsMask*/);
73 }
74
75 bool wxBMPHandler::SaveDib(wxImage *image,
76 wxOutputStream& stream,
77 bool verbose,
78 bool IsBmp,
79 bool IsMask)
80
81 {
82 wxCHECK_MSG( image, false, _T("invalid pointer in wxBMPHandler::SaveFile") );
83
84 if ( !image->Ok() )
85 {
86 if ( verbose )
87 wxLogError(_("BMP: Couldn't save invalid image."));
88 return false;
89 }
90
91 // get the format of the BMP file to save, else use 24bpp
92 unsigned format = wxBMP_24BPP;
93 if ( image->HasOption(wxIMAGE_OPTION_BMP_FORMAT) )
94 format = image->GetOptionInt(wxIMAGE_OPTION_BMP_FORMAT);
95
96 wxUint16 bpp; // # of bits per pixel
97 int palette_size; // # of color map entries, ie. 2^bpp colors
98
99 // set the bpp and appropriate palette_size, and do additional checks
100 if ( (format == wxBMP_1BPP) || (format == wxBMP_1BPP_BW) )
101 {
102 bpp = 1;
103 palette_size = 2;
104 }
105 else if ( format == wxBMP_4BPP )
106 {
107 bpp = 4;
108 palette_size = 16;
109 }
110 else if ( (format == wxBMP_8BPP) || (format == wxBMP_8BPP_GREY) ||
111 (format == wxBMP_8BPP_RED) || (format == wxBMP_8BPP_PALETTE) )
112 {
113 // need to set a wxPalette to use this, HOW TO CHECK IF VALID, SIZE?
114 if ((format == wxBMP_8BPP_PALETTE)
115 #if wxUSE_PALETTE
116 && !image->HasPalette()
117 #endif // wxUSE_PALETTE
118 )
119 {
120 if ( verbose )
121 wxLogError(_("BMP: wxImage doesn't have own wxPalette."));
122 return false;
123 }
124 bpp = 8;
125 palette_size = 256;
126 }
127 else // you get 24bpp
128 {
129 format = wxBMP_24BPP;
130 bpp = 24;
131 palette_size = 0;
132 }
133
134 unsigned width = image->GetWidth();
135 unsigned row_padding = (4 - int(width*bpp/8.0) % 4) % 4; // # bytes to pad to dword
136 unsigned row_width = int(width * bpp/8.0) + row_padding; // # of bytes per row
137
138 struct
139 {
140 // BitmapHeader:
141 wxUint16 magic; // format magic, always 'BM'
142 wxUint32 filesize; // total file size, inc. headers
143 wxUint32 reserved; // for future use
144 wxUint32 data_offset; // image data offset in the file
145
146 // BitmapInfoHeader:
147 wxUint32 bih_size; // 2nd part's size
148 wxUint32 width, height; // bitmap's dimensions
149 wxUint16 planes; // num of planes
150 wxUint16 bpp; // bits per pixel
151 wxUint32 compression; // compression method
152 wxUint32 size_of_bmp; // size of the bitmap
153 wxUint32 h_res, v_res; // image resolution in pixels-per-meter
154 wxUint32 num_clrs; // number of colors used
155 wxUint32 num_signif_clrs;// number of significant colors
156 } hdr;
157
158 wxUint32 hdr_size = 14/*BitmapHeader*/ + 40/*BitmapInfoHeader*/;
159
160 hdr.magic = wxUINT16_SWAP_ON_BE(0x4D42/*'BM'*/);
161 hdr.filesize = wxUINT32_SWAP_ON_BE( hdr_size + palette_size*4 +
162 row_width * image->GetHeight() );
163 hdr.reserved = 0;
164 hdr.data_offset = wxUINT32_SWAP_ON_BE(hdr_size + palette_size*4);
165
166 hdr.bih_size = wxUINT32_SWAP_ON_BE(hdr_size - 14);
167 hdr.width = wxUINT32_SWAP_ON_BE(image->GetWidth());
168 if ( IsBmp )
169 {
170 hdr.height = wxUINT32_SWAP_ON_BE(image->GetHeight());
171 }
172 else
173 {
174 hdr.height = wxUINT32_SWAP_ON_BE(2 * image->GetHeight());
175 }
176 hdr.planes = wxUINT16_SWAP_ON_BE(1); // always 1 plane
177 hdr.bpp = wxUINT16_SWAP_ON_BE(bpp);
178 hdr.compression = 0; // RGB uncompressed
179 hdr.size_of_bmp = wxUINT32_SWAP_ON_BE(row_width * image->GetHeight());
180
181 // get the resolution from the image options or fall back to 72dpi standard
182 // for the BMP format if not specified
183 wxUint32 hres = image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX),
184 vres = image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
185 switch ( image->GetOptionInt(wxIMAGE_OPTION_RESOLUTION) )
186 {
187 default:
188 wxFAIL_MSG( _T("unexpected image resolution units") );
189 // fall through
190
191 case wxIMAGE_RESOLUTION_NONE:
192 hres =
193 vres = 72;
194 // fall through to convert it to correct units
195
196 case wxIMAGE_RESOLUTION_INCHES:
197 // convert resolution in inches to resolution in centimeters
198 hres = (wxUint32)(100*mm2inches*hres);
199 vres = (wxUint32)(100*mm2inches*vres);
200 // fall through to convert it to resolution in meters
201
202 case wxIMAGE_RESOLUTION_CM:
203 // convert resolution in centimeters to resolution in meters
204 hres *= 100;
205 vres *= 100;
206 break;
207 }
208
209 hdr.h_res = wxUINT32_SWAP_ON_BE(hres);
210 hdr.v_res = wxUINT32_SWAP_ON_BE(vres);
211 hdr.num_clrs = wxUINT32_SWAP_ON_BE(palette_size); // # colors in colormap
212 hdr.num_signif_clrs = 0; // all colors are significant
213
214 if ( IsBmp )
215 {
216 if (// VS: looks ugly but compilers tend to do ugly things with structs,
217 // like aligning hdr.filesize's ofset to dword :(
218 // VZ: we should add padding then...
219 !stream.Write(&hdr.magic, 2) ||
220 !stream.Write(&hdr.filesize, 4) ||
221 !stream.Write(&hdr.reserved, 4) ||
222 !stream.Write(&hdr.data_offset, 4)
223 )
224 {
225 if (verbose)
226 wxLogError(_("BMP: Couldn't write the file (Bitmap) header."));
227 return false;
228 }
229 }
230 if ( !IsMask )
231 {
232 if (
233 !stream.Write(&hdr.bih_size, 4) ||
234 !stream.Write(&hdr.width, 4) ||
235 !stream.Write(&hdr.height, 4) ||
236 !stream.Write(&hdr.planes, 2) ||
237 !stream.Write(&hdr.bpp, 2) ||
238 !stream.Write(&hdr.compression, 4) ||
239 !stream.Write(&hdr.size_of_bmp, 4) ||
240 !stream.Write(&hdr.h_res, 4) ||
241 !stream.Write(&hdr.v_res, 4) ||
242 !stream.Write(&hdr.num_clrs, 4) ||
243 !stream.Write(&hdr.num_signif_clrs, 4)
244 )
245 {
246 if (verbose)
247 wxLogError(_("BMP: Couldn't write the file (BitmapInfo) header."));
248 return false;
249 }
250 }
251
252 wxPalette *palette = NULL; // entries for quantized images
253 wxUint8 *rgbquad = NULL; // for the RGBQUAD bytes for the colormap
254 wxImage *q_image = NULL; // destination for quantized image
255
256 // if <24bpp use quantization to reduce colors for *some* of the formats
257 if ( (format == wxBMP_1BPP) || (format == wxBMP_4BPP) ||
258 (format == wxBMP_8BPP) || (format == wxBMP_8BPP_PALETTE) )
259 {
260 // make a new palette and quantize the image
261 if (format != wxBMP_8BPP_PALETTE)
262 {
263 q_image = new wxImage();
264
265 // I get a delete error using Quantize when desired colors > 236
266 int quantize = ((palette_size > 236) ? 236 : palette_size);
267 // fill the destination too, it gives much nicer 4bpp images
268 wxQuantize::Quantize( *image, *q_image, &palette, quantize, 0,
269 wxQUANTIZE_FILL_DESTINATION_IMAGE );
270 }
271 else
272 {
273 #if wxUSE_PALETTE
274 palette = new wxPalette(image->GetPalette());
275 #endif // wxUSE_PALETTE
276 }
277
278 int i;
279 unsigned char r, g, b;
280 rgbquad = new wxUint8 [palette_size*4];
281
282 for (i = 0; i < palette_size; i++)
283 {
284 #if wxUSE_PALETTE
285 if ( !palette->GetRGB(i, &r, &g, &b) )
286 #endif // wxUSE_PALETTE
287 r = g = b = 0;
288
289 rgbquad[i*4] = b;
290 rgbquad[i*4+1] = g;
291 rgbquad[i*4+2] = r;
292 rgbquad[i*4+3] = 0;
293 }
294 }
295 // make a 256 entry greyscale colormap or 2 entry black & white
296 else if ( (format == wxBMP_8BPP_GREY) || (format == wxBMP_8BPP_RED) ||
297 (format == wxBMP_1BPP_BW) )
298 {
299 rgbquad = new wxUint8 [palette_size*4];
300
301 for ( int i = 0; i < palette_size; i++ )
302 {
303 // if 1BPP_BW then the value should be either 0 or 255
304 wxUint8 c = (wxUint8)((i > 0) && (format == wxBMP_1BPP_BW) ? 255 : i);
305
306 rgbquad[i*4] =
307 rgbquad[i*4+1] =
308 rgbquad[i*4+2] = c;
309 rgbquad[i*4+3] = 0;
310 }
311 }
312
313 // if the colormap was made, then it needs to be written
314 if (rgbquad)
315 {
316 if ( !IsMask )
317 {
318 if ( !stream.Write(rgbquad, palette_size*4) )
319 {
320 if (verbose)
321 wxLogError(_("BMP: Couldn't write RGB color map."));
322 delete[] rgbquad;
323 #if wxUSE_PALETTE
324 delete palette;
325 #endif // wxUSE_PALETTE
326 delete q_image;
327 return false;
328 }
329 }
330 delete []rgbquad;
331 }
332
333 // pointer to the image data, use quantized if available
334 wxUint8 *data = (wxUint8*) image->GetData();
335 if (q_image) if (q_image->Ok()) data = (wxUint8*) q_image->GetData();
336
337 wxUint8 *buffer = new wxUint8[row_width];
338 memset(buffer, 0, row_width);
339 int y; unsigned x;
340 long int pixel;
341
342 for (y = image->GetHeight() -1; y >= 0; y--)
343 {
344 if ( format == wxBMP_24BPP ) // 3 bytes per pixel red,green,blue
345 {
346 for ( x = 0; x < width; x++ )
347 {
348 pixel = 3*(y*width + x);
349
350 buffer[3*x ] = data[pixel+2];
351 buffer[3*x + 1] = data[pixel+1];
352 buffer[3*x + 2] = data[pixel];
353 }
354 }
355 else if ((format == wxBMP_8BPP) || // 1 byte per pixel in color
356 (format == wxBMP_8BPP_PALETTE))
357 {
358 for (x = 0; x < width; x++)
359 {
360 pixel = 3*(y*width + x);
361 #if wxUSE_PALETTE
362 buffer[x] = (wxUint8)palette->GetPixel( data[pixel],
363 data[pixel+1],
364 data[pixel+2] );
365 #else
366 // FIXME: what should this be? use some std palette maybe?
367 buffer[x] = 0;
368 #endif // wxUSE_PALETTE
369 }
370 }
371 else if ( format == wxBMP_8BPP_GREY ) // 1 byte per pix, rgb ave to grey
372 {
373 for (x = 0; x < width; x++)
374 {
375 pixel = 3*(y*width + x);
376 buffer[x] = (wxUint8)(.299*data[pixel] +
377 .587*data[pixel+1] +
378 .114*data[pixel+2]);
379 }
380 }
381 else if ( format == wxBMP_8BPP_RED ) // 1 byte per pixel, red as greys
382 {
383 for (x = 0; x < width; x++)
384 {
385 buffer[x] = (wxUint8)data[3*(y*width + x)];
386 }
387 }
388 else if ( format == wxBMP_4BPP ) // 4 bpp in color
389 {
390 for (x = 0; x < width; x+=2)
391 {
392 pixel = 3*(y*width + x);
393
394 // fill buffer, ignore if > width
395 #if wxUSE_PALETTE
396 buffer[x/2] = (wxUint8)(
397 ((wxUint8)palette->GetPixel(data[pixel],
398 data[pixel+1],
399 data[pixel+2]) << 4) |
400 (((x+1) > width)
401 ? 0
402 : ((wxUint8)palette->GetPixel(data[pixel+3],
403 data[pixel+4],
404 data[pixel+5]) )) );
405 #else
406 // FIXME: what should this be? use some std palette maybe?
407 buffer[x/2] = 0;
408 #endif // wxUSE_PALETTE
409 }
410 }
411 else if ( format == wxBMP_1BPP ) // 1 bpp in "color"
412 {
413 for (x = 0; x < width; x+=8)
414 {
415 pixel = 3*(y*width + x);
416
417 #if wxUSE_PALETTE
418 buffer[x/8] = (wxUint8)(
419 ((wxUint8)palette->GetPixel(data[pixel], data[pixel+1], data[pixel+2]) << 7) |
420 (((x+1) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+3], data[pixel+4], data[pixel+5]) << 6)) |
421 (((x+2) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+6], data[pixel+7], data[pixel+8]) << 5)) |
422 (((x+3) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+9], data[pixel+10], data[pixel+11]) << 4)) |
423 (((x+4) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+12], data[pixel+13], data[pixel+14]) << 3)) |
424 (((x+5) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+15], data[pixel+16], data[pixel+17]) << 2)) |
425 (((x+6) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+18], data[pixel+19], data[pixel+20]) << 1)) |
426 (((x+7) > width) ? 0 : ((wxUint8)palette->GetPixel(data[pixel+21], data[pixel+22], data[pixel+23]) )) );
427 #else
428 // FIXME: what should this be? use some std palette maybe?
429 buffer[x/8] = 0;
430 #endif // wxUSE_PALETTE
431 }
432 }
433 else if ( format == wxBMP_1BPP_BW ) // 1 bpp B&W colormap from red color ONLY
434 {
435 for (x = 0; x < width; x+=8)
436 {
437 pixel = 3*(y*width + x);
438
439 buffer[x/8] = (wxUint8)(
440 (((wxUint8)(data[pixel] /128.)) << 7) |
441 (((x+1) > width) ? 0 : (((wxUint8)(data[pixel+3] /128.)) << 6)) |
442 (((x+2) > width) ? 0 : (((wxUint8)(data[pixel+6] /128.)) << 5)) |
443 (((x+3) > width) ? 0 : (((wxUint8)(data[pixel+9] /128.)) << 4)) |
444 (((x+4) > width) ? 0 : (((wxUint8)(data[pixel+12]/128.)) << 3)) |
445 (((x+5) > width) ? 0 : (((wxUint8)(data[pixel+15]/128.)) << 2)) |
446 (((x+6) > width) ? 0 : (((wxUint8)(data[pixel+18]/128.)) << 1)) |
447 (((x+7) > width) ? 0 : (((wxUint8)(data[pixel+21]/128.)) )) );
448 }
449 }
450
451 if ( !stream.Write(buffer, row_width) )
452 {
453 if (verbose)
454 wxLogError(_("BMP: Couldn't write data."));
455 delete[] buffer;
456 #if wxUSE_PALETTE
457 delete palette;
458 #endif // wxUSE_PALETTE
459 delete q_image;
460 return false;
461 }
462 }
463 delete[] buffer;
464 #if wxUSE_PALETTE
465 delete palette;
466 #endif // wxUSE_PALETTE
467 delete q_image;
468
469 return true;
470 }
471
472
473 struct BMPPalette
474 {
475 static void Free(BMPPalette* pal) { delete [] pal; }
476
477 unsigned char r, g, b;
478 };
479
480 bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
481 int bpp, int ncolors, int comp,
482 wxFileOffset bmpOffset, wxInputStream& stream,
483 bool verbose, bool IsBmp, bool hasPalette)
484 {
485 wxInt32 aDword, rmask = 0, gmask = 0, bmask = 0, amask = 0;
486 int rshift = 0, gshift = 0, bshift = 0, ashift = 0;
487 int rbits = 0, gbits = 0, bbits = 0, abits = 0;
488 wxInt32 dbuf[4];
489 wxInt8 bbuf[4];
490 wxUint8 aByte;
491 wxUint16 aWord;
492
493 // allocate space for palette if needed:
494 BMPPalette *cmap;
495
496 if ( bpp < 16 )
497 {
498 cmap = new BMPPalette[ncolors];
499 if ( !cmap )
500 {
501 if (verbose)
502 wxLogError(_("BMP: Couldn't allocate memory."));
503 return false;
504 }
505 }
506 else // no palette
507 {
508 cmap = NULL;
509 }
510
511 wxON_BLOCK_EXIT1(&BMPPalette::Free, cmap);
512
513 // destroy existing here instead of:
514 image->Destroy();
515 image->Create(width, height);
516
517 unsigned char *ptr = image->GetData();
518
519 if ( !ptr )
520 {
521 if ( verbose )
522 wxLogError( _("BMP: Couldn't allocate memory.") );
523 return false;
524 }
525
526 unsigned char *alpha;
527 if ( bpp == 32 )
528 {
529 // tell the image to allocate an alpha buffer
530 image->SetAlpha();
531 alpha = image->GetAlpha();
532 if ( !alpha )
533 {
534 if ( verbose )
535 wxLogError(_("BMP: Couldn't allocate memory."));
536 return false;
537 }
538 }
539 else // no alpha
540 {
541 alpha = NULL;
542 }
543
544 // Reading the palette, if it exists:
545 if ( bpp < 16 && ncolors != 0 )
546 {
547 unsigned char* r = new unsigned char[ncolors];
548 unsigned char* g = new unsigned char[ncolors];
549 unsigned char* b = new unsigned char[ncolors];
550 for (int j = 0; j < ncolors; j++)
551 {
552 if (hasPalette)
553 {
554 stream.Read(bbuf, 4);
555 cmap[j].b = bbuf[0];
556 cmap[j].g = bbuf[1];
557 cmap[j].r = bbuf[2];
558
559 r[j] = cmap[j].r;
560 g[j] = cmap[j].g;
561 b[j] = cmap[j].b;
562 }
563 else
564 {
565 //used in reading .ico file mask
566 r[j] = cmap[j].r =
567 g[j] = cmap[j].g =
568 b[j] = cmap[j].b = ( j ? 255 : 0 );
569 }
570 }
571
572 #if wxUSE_PALETTE
573 // Set the palette for the wxImage
574 image->SetPalette(wxPalette(ncolors, r, g, b));
575 #endif // wxUSE_PALETTE
576
577 delete[] r;
578 delete[] g;
579 delete[] b;
580 }
581 else if ( bpp == 16 || bpp == 32 )
582 {
583 if ( comp == BI_BITFIELDS )
584 {
585 int bit = 0;
586 stream.Read(dbuf, 4 * 3);
587 rmask = wxINT32_SWAP_ON_BE(dbuf[0]);
588 gmask = wxINT32_SWAP_ON_BE(dbuf[1]);
589 bmask = wxINT32_SWAP_ON_BE(dbuf[2]);
590 // find shift amount (Least significant bit of mask)
591 for (bit = bpp-1; bit>=0; bit--)
592 {
593 if (bmask & (1 << bit))
594 bshift = bit;
595 if (gmask & (1 << bit))
596 gshift = bit;
597 if (rmask & (1 << bit))
598 rshift = bit;
599 }
600 // Find number of bits in mask (MSB-LSB+1)
601 for (bit = 0; bit < bpp; bit++)
602 {
603 if (bmask & (1 << bit))
604 bbits = bit-bshift+1;
605 if (gmask & (1 << bit))
606 gbits = bit-gshift+1;
607 if (rmask & (1 << bit))
608 rbits = bit-rshift+1;
609 }
610 }
611 else if ( bpp == 16 )
612 {
613 rmask = 0x7C00;
614 gmask = 0x03E0;
615 bmask = 0x001F;
616 rshift = 10;
617 gshift = 5;
618 bshift = 0;
619 rbits = 5;
620 gbits = 5;
621 bbits = 5;
622 }
623 else if ( bpp == 32 )
624 {
625 rmask = 0x00FF0000;
626 gmask = 0x0000FF00;
627 bmask = 0x000000FF;
628 amask = 0xFF000000;
629
630 ashift = 24;
631 rshift = 16;
632 gshift = 8;
633 bshift = 0;
634 abits = 8;
635 rbits = 8;
636 gbits = 8;
637 bbits = 8;
638 }
639 }
640
641 /*
642 * Reading the image data
643 */
644 if ( IsBmp )
645 stream.SeekI(bmpOffset); // else icon, just carry on
646
647 unsigned char *data = ptr;
648
649 /* set the whole image to the background color */
650 if ( bpp < 16 && (comp == BI_RLE4 || comp == BI_RLE8) )
651 {
652 for (int i = 0; i < width * height; i++)
653 {
654 *ptr++ = cmap[0].r;
655 *ptr++ = cmap[0].g;
656 *ptr++ = cmap[0].b;
657 }
658 ptr = data;
659 }
660
661 int linesize = ((width * bpp + 31) / 32) * 4;
662
663 /* BMPs are stored upside down */
664 for ( int line = (height - 1); line >= 0; line-- )
665 {
666 int linepos = 0;
667 for ( int column = 0; column < width ; )
668 {
669 if ( bpp < 16 )
670 {
671 linepos++;
672 aByte = stream.GetC();
673 if ( bpp == 1 )
674 {
675 for (int bit = 0; bit < 8 && column < width; bit++)
676 {
677 int index = ((aByte & (0x80 >> bit)) ? 1 : 0);
678 ptr[poffset] = cmap[index].r;
679 ptr[poffset + 1] = cmap[index].g;
680 ptr[poffset + 2] = cmap[index].b;
681 column++;
682 }
683 }
684 else if ( bpp == 4 )
685 {
686 if ( comp == BI_RLE4 )
687 {
688 wxUint8 first;
689 first = aByte;
690 aByte = stream.GetC();
691 if ( first == 0 )
692 {
693 if ( aByte == 0 )
694 {
695 if ( column > 0 )
696 column = width;
697 }
698 else if ( aByte == 1 )
699 {
700 column = width;
701 line = -1;
702 }
703 else if ( aByte == 2 )
704 {
705 aByte = stream.GetC();
706 column += aByte;
707 linepos = column * bpp / 4;
708 aByte = stream.GetC();
709 line -= aByte; // upside down
710 }
711 else
712 {
713 int absolute = aByte;
714 wxUint8 nibble[2] ;
715 int readBytes = 0 ;
716 for (int k = 0; k < absolute; k++)
717 {
718 if ( !(k % 2 ) )
719 {
720 ++readBytes ;
721 aByte = stream.GetC();
722 nibble[0] = (wxUint8)( (aByte & 0xF0) >> 4 ) ;
723 nibble[1] = (wxUint8)( aByte & 0x0F ) ;
724 }
725 ptr[poffset ] = cmap[nibble[k%2]].r;
726 ptr[poffset + 1] = cmap[nibble[k%2]].g;
727 ptr[poffset + 2] = cmap[nibble[k%2]].b;
728 column++;
729 if ( k % 2 )
730 linepos++;
731 }
732 if ( readBytes & 0x01 )
733 aByte = stream.GetC();
734 }
735 }
736 else
737 {
738 wxUint8 nibble[2] ;
739 nibble[0] = (wxUint8)( (aByte & 0xF0) >> 4 ) ;
740 nibble[1] = (wxUint8)( aByte & 0x0F ) ;
741
742 for ( int l = 0; l < first && column < width; l++ )
743 {
744 ptr[poffset ] = cmap[nibble[l%2]].r;
745 ptr[poffset + 1] = cmap[nibble[l%2]].g;
746 ptr[poffset + 2] = cmap[nibble[l%2]].b;
747 column++;
748 if ( l % 2 )
749 linepos++;
750 }
751 }
752 }
753 else
754 {
755 for (int nibble = 0; nibble < 2 && column < width; nibble++)
756 {
757 int index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
758 if ( index >= 16 )
759 index = 15;
760 ptr[poffset] = cmap[index].r;
761 ptr[poffset + 1] = cmap[index].g;
762 ptr[poffset + 2] = cmap[index].b;
763 column++;
764 }
765 }
766 }
767 else if ( bpp == 8 )
768 {
769 if ( comp == BI_RLE8 )
770 {
771 unsigned char first;
772 first = aByte;
773 aByte = stream.GetC();
774 if ( first == 0 )
775 {
776 if ( aByte == 0 )
777 {
778 /* column = width; */
779 }
780 else if ( aByte == 1 )
781 {
782 column = width;
783 line = -1;
784 }
785 else if ( aByte == 2 )
786 {
787 aByte = stream.GetC();
788 column += aByte;
789 linepos = column * bpp / 8;
790 aByte = stream.GetC();
791 line += aByte;
792 }
793 else
794 {
795 int absolute = aByte;
796 for (int k = 0; k < absolute; k++)
797 {
798 linepos++;
799 aByte = stream.GetC();
800 ptr[poffset ] = cmap[aByte].r;
801 ptr[poffset + 1] = cmap[aByte].g;
802 ptr[poffset + 2] = cmap[aByte].b;
803 column++;
804 }
805 if ( absolute & 0x01 )
806 aByte = stream.GetC();
807 }
808 }
809 else
810 {
811 for ( int l = 0; l < first && column < width; l++ )
812 {
813 ptr[poffset ] = cmap[aByte].r;
814 ptr[poffset + 1] = cmap[aByte].g;
815 ptr[poffset + 2] = cmap[aByte].b;
816 column++;
817 linepos++;
818 }
819 }
820 }
821 else
822 {
823 ptr[poffset ] = cmap[aByte].r;
824 ptr[poffset + 1] = cmap[aByte].g;
825 ptr[poffset + 2] = cmap[aByte].b;
826 column++;
827 // linepos += size; seems to be wrong, RR
828 }
829 }
830 }
831 else if ( bpp == 24 )
832 {
833 stream.Read(bbuf, 3);
834 linepos += 3;
835 ptr[poffset ] = (unsigned char)bbuf[2];
836 ptr[poffset + 1] = (unsigned char)bbuf[1];
837 ptr[poffset + 2] = (unsigned char)bbuf[0];
838 column++;
839 }
840 else if ( bpp == 16 )
841 {
842 unsigned char temp;
843 stream.Read(&aWord, 2);
844 aWord = wxUINT16_SWAP_ON_BE(aWord);
845 linepos += 2;
846 /* use the masks and calculated amonut of shift
847 to retrieve the color data out of the word. Then
848 shift it left by (8 - number of bits) such that
849 the image has the proper dynamic range */
850 temp = (unsigned char)((aWord & rmask) >> rshift << (8-rbits));
851 ptr[poffset] = temp;
852 temp = (unsigned char)((aWord & gmask) >> gshift << (8-gbits));
853 ptr[poffset + 1] = temp;
854 temp = (unsigned char)((aWord & bmask) >> bshift << (8-bbits));
855 ptr[poffset + 2] = temp;
856 column++;
857 }
858 else
859 {
860 unsigned char temp;
861 stream.Read(&aDword, 4);
862 aDword = wxINT32_SWAP_ON_BE(aDword);
863 linepos += 4;
864 temp = (unsigned char)((aDword & rmask) >> rshift);
865 ptr[poffset] = temp;
866 temp = (unsigned char)((aDword & gmask) >> gshift);
867 ptr[poffset + 1] = temp;
868 temp = (unsigned char)((aDword & bmask) >> bshift);
869 ptr[poffset + 2] = temp;
870 if ( alpha )
871 {
872 temp = (unsigned char)((aDword & amask) >> ashift);
873 alpha[line * width + column] = temp;
874 }
875 column++;
876 }
877 }
878 while ( (linepos < linesize) && (comp != 1) && (comp != 2) )
879 {
880 stream.Read(&aByte, 1);
881 linepos += 1;
882 if ( !stream )
883 break;
884 }
885 }
886
887 image->SetMask(false);
888
889 const wxStreamError err = stream.GetLastError();
890 return err == wxSTREAM_NO_ERROR || err == wxSTREAM_EOF;
891 }
892
893 bool wxBMPHandler::LoadDib(wxImage *image, wxInputStream& stream,
894 bool verbose, bool IsBmp)
895 {
896 wxUint16 aWord;
897 wxInt32 dbuf[4];
898 wxInt8 bbuf[4];
899
900 wxFileOffset offset = 0; // keep gcc quiet
901 if ( IsBmp )
902 {
903 // read the header off the .BMP format file
904
905 offset = stream.TellI();
906 if (offset == wxInvalidOffset)
907 offset = 0;
908
909 stream.Read(bbuf, 2);
910 stream.Read(dbuf, 16);
911 }
912 else
913 {
914 stream.Read(dbuf, 4);
915 }
916 #if 0 // unused
917 wxInt32 size = wxINT32_SWAP_ON_BE(dbuf[0]);
918 #endif
919 offset = offset + wxINT32_SWAP_ON_BE(dbuf[2]);
920
921 stream.Read(dbuf, 4 * 2);
922 int width = wxINT32_SWAP_ON_BE((int)dbuf[0]);
923 int height = wxINT32_SWAP_ON_BE((int)dbuf[1]);
924 if ( !IsBmp)height = height / 2; // for icons divide by 2
925
926 if ( width > 32767 )
927 {
928 if (verbose)
929 wxLogError( _("DIB Header: Image width > 32767 pixels for file.") );
930 return false;
931 }
932 if ( height > 32767 )
933 {
934 if (verbose)
935 wxLogError( _("DIB Header: Image height > 32767 pixels for file.") );
936 return false;
937 }
938
939 stream.Read(&aWord, 2);
940 /*
941 TODO
942 int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
943 */
944 stream.Read(&aWord, 2);
945 int bpp = wxUINT16_SWAP_ON_BE((int)aWord);
946 if ( bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32 )
947 {
948 if (verbose)
949 wxLogError( _("DIB Header: Unknown bitdepth in file.") );
950 return false;
951 }
952
953 stream.Read(dbuf, 4 * 4);
954 int comp = wxINT32_SWAP_ON_BE((int)dbuf[0]);
955 if ( comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 &&
956 comp != BI_BITFIELDS )
957 {
958 if (verbose)
959 wxLogError( _("DIB Header: Unknown encoding in file.") );
960 return false;
961 }
962
963 stream.Read(dbuf, 4 * 2);
964
965 int ncolors = wxINT32_SWAP_ON_BE( (int)dbuf[0] );
966 if (ncolors == 0)
967 ncolors = 1 << bpp;
968 /* some more sanity checks */
969 if (((comp == BI_RLE4) && (bpp != 4)) ||
970 ((comp == BI_RLE8) && (bpp != 8)) ||
971 ((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
972 {
973 if (verbose)
974 wxLogError( _("DIB Header: Encoding doesn't match bitdepth.") );
975 return false;
976 }
977
978 //read DIB; this is the BMP image or the XOR part of an icon image
979 if ( !DoLoadDib(image, width, height, bpp, ncolors, comp, offset, stream,
980 verbose, IsBmp, true) )
981 {
982 if (verbose)
983 wxLogError( _("Error in reading image DIB.") );
984 return false;
985 }
986
987 if ( !IsBmp )
988 {
989 //read Icon mask which is monochrome
990 //there is no palette, so we will create one
991 wxImage mask;
992 if ( !DoLoadDib(&mask, width, height, 1, 2, BI_RGB, offset, stream,
993 verbose, IsBmp, false) )
994 {
995 if (verbose)
996 wxLogError( _("ICO: Error in reading mask DIB.") );
997 return false;
998 }
999 image->SetMaskFromImage(mask, 255, 255, 255);
1000
1001 }
1002
1003 // the resolution in the bitmap header is in meters, convert to centimeters
1004 image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, wxIMAGE_RESOLUTION_CM);
1005 image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, dbuf[2]/100);
1006 image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, dbuf[3]/100);
1007
1008 return true;
1009 }
1010
1011 bool wxBMPHandler::LoadFile(wxImage *image, wxInputStream& stream,
1012 bool verbose, int WXUNUSED(index))
1013 {
1014 // Read a single DIB fom the file:
1015 return LoadDib(image, stream, verbose, true/*isBmp*/);
1016 }
1017
1018 bool wxBMPHandler::DoCanRead(wxInputStream& stream)
1019 {
1020 unsigned char hdr[2];
1021
1022 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
1023 return false;
1024
1025 // do we have the BMP file signature?
1026 return hdr[0] == 'B' && hdr[1] == 'M';
1027 }
1028
1029 #endif // wxUSE_STREAMS
1030
1031
1032 #if wxUSE_ICO_CUR
1033 //-----------------------------------------------------------------------------
1034 // wxICOHandler
1035 //-----------------------------------------------------------------------------
1036
1037 IMPLEMENT_DYNAMIC_CLASS(wxICOHandler, wxBMPHandler)
1038
1039 #if wxUSE_STREAMS
1040
1041 struct ICONDIRENTRY
1042 {
1043 wxUint8 bWidth; // Width of the image
1044 wxUint8 bHeight; // Height of the image (times 2)
1045 wxUint8 bColorCount; // Number of colors in image (0 if >=8bpp)
1046 wxUint8 bReserved; // Reserved
1047
1048 // these two are different in icons and cursors:
1049 // icon or cursor
1050 wxUint16 wPlanes; // Color Planes or XHotSpot
1051 wxUint16 wBitCount; // Bits per pixel or YHotSpot
1052
1053 wxUint32 dwBytesInRes; // how many bytes in this resource?
1054 wxUint32 dwImageOffset; // where in the file is this image
1055 };
1056
1057 struct ICONDIR
1058 {
1059 wxUint16 idReserved; // Reserved
1060 wxUint16 idType; // resource type (1 for icons, 2 for cursors)
1061 wxUint16 idCount; // how many images?
1062 };
1063
1064
1065 bool wxICOHandler::SaveFile(wxImage *image,
1066 wxOutputStream& stream,
1067 bool verbose)
1068
1069 {
1070 //sanity check; icon must be less than 127 pixels high and 255 wide
1071 if ( image->GetHeight () > 127 )
1072 {
1073 if ( verbose )
1074 wxLogError(_("ICO: Image too tall for an icon."));
1075 return false;
1076 }
1077 if ( image->GetWidth () > 255 )
1078 {
1079 if ( verbose )
1080 wxLogError(_("ICO: Image too wide for an icon."));
1081 return false;
1082 }
1083
1084 const int images = 1; // only generate one image
1085
1086 // VS: This is a hack of sort - since ICO and CUR files are almost
1087 // identical, we have all the meat in wxICOHandler and check for
1088 // the actual (handler) type when the code has to distinguish between
1089 // the two formats
1090 int type = (this->GetType() == wxBITMAP_TYPE_CUR) ? 2 : 1;
1091
1092 // write a header, (ICONDIR)
1093 // Calculate the header size
1094 wxUint32 offset = 3 * sizeof(wxUint16);
1095
1096 ICONDIR IconDir;
1097 IconDir.idReserved = 0;
1098 IconDir.idType = wxUINT16_SWAP_ON_BE((wxUint16)type);
1099 IconDir.idCount = wxUINT16_SWAP_ON_BE((wxUint16)images);
1100 stream.Write(&IconDir.idReserved, sizeof(IconDir.idReserved));
1101 stream.Write(&IconDir.idType, sizeof(IconDir.idType));
1102 stream.Write(&IconDir.idCount, sizeof(IconDir.idCount));
1103 if ( !stream.IsOk() )
1104 {
1105 if ( verbose )
1106 wxLogError(_("ICO: Error writing the image file!"));
1107 return false;
1108 }
1109
1110 // for each iamage write a description ICONDIRENTRY:
1111 ICONDIRENTRY icondirentry;
1112 for (int img = 0; img < images; img++)
1113 {
1114 wxImage mask;
1115
1116 if ( image->HasMask() )
1117 {
1118 // make another image with black/white:
1119 mask = image->ConvertToMono (image->GetMaskRed(), image->GetMaskGreen(), image->GetMaskBlue() );
1120
1121 // now we need to change the masked regions to black:
1122 unsigned char r = image->GetMaskRed();
1123 unsigned char g = image->GetMaskGreen();
1124 unsigned char b = image->GetMaskBlue();
1125 if ( (r != 0) || (g != 0) || (b != 0) )
1126 {
1127 // Go round and apply black to the masked bits:
1128 int i, j;
1129 for (i = 0; i < mask.GetWidth(); i++)
1130 {
1131 for (j = 0; j < mask.GetHeight(); j++)
1132 {
1133 if ((r == mask.GetRed(i, j)) &&
1134 (g == mask.GetGreen(i, j))&&
1135 (b == mask.GetBlue(i, j)) )
1136 image->SetRGB(i, j, 0, 0, 0 );
1137 }
1138 }
1139 }
1140 }
1141 else
1142 {
1143 // just make a black mask all over:
1144 mask = image->Copy();
1145 int i, j;
1146 for (i = 0; i < mask.GetWidth(); i++)
1147 for (j = 0; j < mask.GetHeight(); j++)
1148 mask.SetRGB(i, j, 0, 0, 0 );
1149 }
1150 // Set the formats for image and mask
1151 // (Windows never saves with more than 8 colors):
1152 image->SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_8BPP);
1153
1154 // monochome bitmap:
1155 mask.SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_1BPP_BW);
1156 bool IsBmp = false;
1157 bool IsMask = false;
1158
1159 //calculate size and offset of image and mask
1160 wxCountingOutputStream cStream;
1161 bool bResult = SaveDib(image, cStream, verbose, IsBmp, IsMask);
1162 if ( !bResult )
1163 {
1164 if ( verbose )
1165 wxLogError(_("ICO: Error writing the image file!"));
1166 return false;
1167 }
1168 IsMask = true;
1169
1170 bResult = SaveDib(&mask, cStream, verbose, IsBmp, IsMask);
1171 if ( !bResult )
1172 {
1173 if ( verbose )
1174 wxLogError(_("ICO: Error writing the image file!"));
1175 return false;
1176 }
1177 wxUint32 Size = cStream.GetSize();
1178
1179 // wxCountingOutputStream::IsOk() always returns true for now and this
1180 // "if" provokes VC++ warnings in optimized build
1181 #if 0
1182 if ( !cStream.Ok() )
1183 {
1184 if ( verbose )
1185 wxLogError(_("ICO: Error writing the image file!"));
1186 return false;
1187 }
1188 #endif // 0
1189
1190 offset = offset + sizeof(ICONDIRENTRY);
1191
1192 icondirentry.bWidth = (wxUint8)image->GetWidth();
1193 icondirentry.bHeight = (wxUint8)(2 * image->GetHeight());
1194 icondirentry.bColorCount = 0;
1195 icondirentry.bReserved = 0;
1196 icondirentry.wPlanes = wxUINT16_SWAP_ON_BE(1);
1197 icondirentry.wBitCount = wxUINT16_SWAP_ON_BE(wxBMP_8BPP);
1198 if ( type == 2 /*CUR*/)
1199 {
1200 int hx = image->HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) ?
1201 image->GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X) :
1202 image->GetWidth() / 2;
1203 int hy = image->HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) ?
1204 image->GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y) :
1205 image->GetHeight() / 2;
1206
1207 // actually write the values of the hot spot here:
1208 icondirentry.wPlanes = wxUINT16_SWAP_ON_BE((wxUint16)hx);
1209 icondirentry.wBitCount = wxUINT16_SWAP_ON_BE((wxUint16)hy);
1210 }
1211 icondirentry.dwBytesInRes = wxUINT32_SWAP_ON_BE(Size);
1212 icondirentry.dwImageOffset = wxUINT32_SWAP_ON_BE(offset);
1213
1214 // increase size to allow for the data written:
1215 offset += Size;
1216
1217 // write to stream:
1218 stream.Write(&icondirentry.bWidth, sizeof(icondirentry.bWidth));
1219 stream.Write(&icondirentry.bHeight, sizeof(icondirentry.bHeight));
1220 stream.Write(&icondirentry.bColorCount, sizeof(icondirentry.bColorCount));
1221 stream.Write(&icondirentry.bReserved, sizeof(icondirentry.bReserved));
1222 stream.Write(&icondirentry.wPlanes, sizeof(icondirentry.wPlanes));
1223 stream.Write(&icondirentry.wBitCount, sizeof(icondirentry.wBitCount));
1224 stream.Write(&icondirentry.dwBytesInRes, sizeof(icondirentry.dwBytesInRes));
1225 stream.Write(&icondirentry.dwImageOffset, sizeof(icondirentry.dwImageOffset));
1226 if ( !stream.IsOk() )
1227 {
1228 if ( verbose )
1229 wxLogError(_("ICO: Error writing the image file!"));
1230 return false;
1231 }
1232
1233 // actually save it:
1234 IsMask = false;
1235 bResult = SaveDib(image, stream, verbose, IsBmp, IsMask);
1236 if ( !bResult )
1237 {
1238 if ( verbose )
1239 wxLogError(_("ICO: Error writing the image file!"));
1240 return false;
1241 }
1242 IsMask = true;
1243
1244 bResult = SaveDib(&mask, stream, verbose, IsBmp, IsMask);
1245 if ( !bResult )
1246 {
1247 if ( verbose )
1248 wxLogError(_("ICO: Error writing the image file!"));
1249 return false;
1250 }
1251
1252 } // end of for loop
1253
1254 return true;
1255 }
1256
1257 bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream,
1258 bool verbose, int index)
1259 {
1260 stream.SeekI(0);
1261 return DoLoadFile(image, stream, verbose, index);
1262 }
1263
1264 bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
1265 bool WXUNUSED(verbose), int index)
1266 {
1267 bool bResult wxDUMMY_INITIALIZE(false);
1268 bool IsBmp = false;
1269
1270 ICONDIR IconDir;
1271
1272 wxFileOffset iPos = stream.TellI();
1273 stream.Read(&IconDir, sizeof(IconDir));
1274 wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
1275 // nType is 1 for Icons, 2 for Cursors:
1276 wxUint16 nType = wxUINT16_SWAP_ON_BE(IconDir.idType);
1277
1278 // loop round the icons and choose the best one:
1279 ICONDIRENTRY *pIconDirEntry = new ICONDIRENTRY[nIcons];
1280 ICONDIRENTRY *pCurrentEntry = pIconDirEntry;
1281 int wMax = 0;
1282 int colmax = 0;
1283 int iSel = wxNOT_FOUND;
1284
1285 for (int i = 0; i < nIcons; i++ )
1286 {
1287 stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY));
1288 // bHeight and bColorCount are wxUint8
1289 if ( pCurrentEntry->bWidth >= wMax )
1290 {
1291 // see if we have more colors, ==0 indicates > 8bpp:
1292 if ( pCurrentEntry->bColorCount == 0 )
1293 pCurrentEntry->bColorCount = 255;
1294 if ( pCurrentEntry->bColorCount >= colmax )
1295 {
1296 iSel = i;
1297 wMax = pCurrentEntry->bWidth;
1298 colmax = pCurrentEntry->bColorCount;
1299 }
1300 }
1301 pCurrentEntry++;
1302 }
1303
1304 if ( index != -1 )
1305 {
1306 // VS: Note that we *have* to run the loop above even if index != -1, because
1307 // it reads ICONDIRENTRies.
1308 iSel = index;
1309 }
1310
1311 if ( iSel == wxNOT_FOUND || iSel < 0 || iSel >= nIcons )
1312 {
1313 wxLogError(_("ICO: Invalid icon index."));
1314 bResult = false;
1315 }
1316 else
1317 {
1318 // seek to selected icon:
1319 pCurrentEntry = pIconDirEntry + iSel;
1320 stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart);
1321 bResult = LoadDib(image, stream, true, IsBmp);
1322 bool bIsCursorType = (this->GetType() == wxBITMAP_TYPE_CUR) || (this->GetType() == wxBITMAP_TYPE_ANI);
1323 if ( bResult && bIsCursorType && nType == 2 )
1324 {
1325 // it is a cursor, so let's set the hotspot:
1326 image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, wxUINT16_SWAP_ON_BE(pCurrentEntry->wPlanes));
1327 image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, wxUINT16_SWAP_ON_BE(pCurrentEntry->wBitCount));
1328 }
1329 }
1330 delete[] pIconDirEntry;
1331 return bResult;
1332 }
1333
1334 int wxICOHandler::GetImageCount(wxInputStream& stream)
1335 {
1336 ICONDIR IconDir;
1337 wxFileOffset iPos = stream.TellI();
1338 stream.SeekI(0);
1339 stream.Read(&IconDir, sizeof(IconDir));
1340 wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
1341 stream.SeekI(iPos);
1342 return (int)nIcons;
1343 }
1344
1345 bool wxICOHandler::DoCanRead(wxInputStream& stream)
1346 {
1347 stream.SeekI(0);
1348 unsigned char hdr[4];
1349 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
1350 return false;
1351
1352 // hdr[2] is one for an icon and two for a cursor
1353 return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\1' && hdr[3] == '\0';
1354 }
1355
1356 #endif // wxUSE_STREAMS
1357
1358
1359 //-----------------------------------------------------------------------------
1360 // wxCURHandler
1361 //-----------------------------------------------------------------------------
1362
1363 IMPLEMENT_DYNAMIC_CLASS(wxCURHandler, wxICOHandler)
1364
1365 #if wxUSE_STREAMS
1366
1367 bool wxCURHandler::DoCanRead(wxInputStream& stream)
1368 {
1369 stream.SeekI(0);
1370 unsigned char hdr[4];
1371 if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
1372 return false;
1373
1374 // hdr[2] is one for an icon and two for a cursor
1375 return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\2' && hdr[3] == '\0';
1376 }
1377
1378 #endif // wxUSE_STREAMS
1379
1380 //-----------------------------------------------------------------------------
1381 // wxANIHandler
1382 //-----------------------------------------------------------------------------
1383
1384 IMPLEMENT_DYNAMIC_CLASS(wxANIHandler, wxCURHandler)
1385
1386 #if wxUSE_STREAMS
1387
1388 bool wxANIHandler::LoadFile(wxImage *image, wxInputStream& stream,
1389 bool WXUNUSED(verbose), int index)
1390 {
1391 wxANIDecoder decoder;
1392 if (!decoder.Load(stream))
1393 return false;
1394
1395 return decoder.ConvertToImage(index != -1 ? (size_t)index : 0, image);
1396 }
1397
1398 bool wxANIHandler::DoCanRead(wxInputStream& stream)
1399 {
1400 wxANIDecoder decod;
1401 return decod.CanRead(stream);
1402 }
1403
1404 int wxANIHandler::GetImageCount(wxInputStream& stream)
1405 {
1406 wxANIDecoder decoder;
1407 if (!decoder.Load(stream))
1408 return wxNOT_FOUND;
1409
1410 return decoder.GetFrameCount();
1411 }
1412
1413 #endif // wxUSE_STREAMS
1414
1415 #endif // wxUSE_ICO_CUR
1416
1417 #endif // wxUSE_IMAGE
wxWidgets (Impactor)