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