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Revision 62 - (show annotations) (download)
Tue Sep 7 11:08:22 2010 UTC (9 years, 4 months ago) by william
File size: 91528 byte(s)
Auto Commited Import of: pcsx2-0.9.7-r3738-debug in ./trunk
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: src/common/image.cpp
3 // Purpose: wxImage
4 // Author: Robert Roebling
5 // RCS-ID: $Id: image.cpp 59197 2009-02-28 15:44:53Z VZ $
6 // Copyright: (c) Robert Roebling
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/image.h"
20
21 #ifndef WX_PRECOMP
22 #include "wx/log.h"
23 #include "wx/hash.h"
24 #include "wx/utils.h"
25 #include "wx/math.h"
26 #include "wx/module.h"
27 #include "wx/palette.h"
28 #include "wx/intl.h"
29 #endif
30
31 #include "wx/filefn.h"
32 #include "wx/wfstream.h"
33 #include "wx/xpmdecod.h"
34
35 // For memcpy
36 #include <string.h>
37
38 // make the code compile with either wxFile*Stream or wxFFile*Stream:
39 #define HAS_FILE_STREAMS (wxUSE_STREAMS && (wxUSE_FILE || wxUSE_FFILE))
40
41 #if HAS_FILE_STREAMS
42 #if wxUSE_FFILE
43 typedef wxFFileInputStream wxImageFileInputStream;
44 typedef wxFFileOutputStream wxImageFileOutputStream;
45 #elif wxUSE_FILE
46 typedef wxFileInputStream wxImageFileInputStream;
47 typedef wxFileOutputStream wxImageFileOutputStream;
48 #endif // wxUSE_FILE/wxUSE_FFILE
49 #endif // HAS_FILE_STREAMS
50
51 #if wxUSE_VARIANT
52 IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(wxImage,WXDLLEXPORT)
53 #endif
54
55 //-----------------------------------------------------------------------------
56 // wxImage
57 //-----------------------------------------------------------------------------
58
59 class wxImageRefData: public wxObjectRefData
60 {
61 public:
62 wxImageRefData();
63 virtual ~wxImageRefData();
64
65 int m_width;
66 int m_height;
67 unsigned char *m_data;
68
69 bool m_hasMask;
70 unsigned char m_maskRed,m_maskGreen,m_maskBlue;
71
72 // alpha channel data, may be NULL for the formats without alpha support
73 unsigned char *m_alpha;
74
75 bool m_ok;
76
77 // if true, m_data is pointer to static data and shouldn't be freed
78 bool m_static;
79
80 // same as m_static but for m_alpha
81 bool m_staticAlpha;
82
83 #if wxUSE_PALETTE
84 wxPalette m_palette;
85 #endif // wxUSE_PALETTE
86
87 wxArrayString m_optionNames;
88 wxArrayString m_optionValues;
89
90 DECLARE_NO_COPY_CLASS(wxImageRefData)
91 };
92
93 wxImageRefData::wxImageRefData()
94 {
95 m_width = 0;
96 m_height = 0;
97 m_data =
98 m_alpha = (unsigned char *) NULL;
99
100 m_maskRed = 0;
101 m_maskGreen = 0;
102 m_maskBlue = 0;
103 m_hasMask = false;
104
105 m_ok = false;
106 m_static =
107 m_staticAlpha = false;
108 }
109
110 wxImageRefData::~wxImageRefData()
111 {
112 if ( !m_static )
113 free( m_data );
114 if ( !m_staticAlpha )
115 free( m_alpha );
116 }
117
118 wxList wxImage::sm_handlers;
119
120 wxImage wxNullImage;
121
122 //-----------------------------------------------------------------------------
123
124 #define M_IMGDATA wx_static_cast(wxImageRefData*, m_refData)
125
126 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
127
128 wxImage::wxImage( int width, int height, bool clear )
129 {
130 Create( width, height, clear );
131 }
132
133 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
134 {
135 Create( width, height, data, static_data );
136 }
137
138 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
139 {
140 Create( width, height, data, alpha, static_data );
141 }
142
143 wxImage::wxImage( const wxString& name, long type, int index )
144 {
145 LoadFile( name, type, index );
146 }
147
148 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
149 {
150 LoadFile( name, mimetype, index );
151 }
152
153 #if wxUSE_STREAMS
154 wxImage::wxImage( wxInputStream& stream, long type, int index )
155 {
156 LoadFile( stream, type, index );
157 }
158
159 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
160 {
161 LoadFile( stream, mimetype, index );
162 }
163 #endif // wxUSE_STREAMS
164
165 wxImage::wxImage(const char* const* xpmData)
166 {
167 Create(xpmData);
168 }
169
170 #if wxUSE_XPM
171 bool wxImage::Create(const char* const* xpmData)
172 {
173 UnRef();
174
175 wxXPMDecoder decoder;
176 (*this) = decoder.ReadData(xpmData);
177 return Ok();
178 }
179 #else
180 bool wxImage::Create( const char* const* WXUNUSED(xpmData) )
181 {
182 return false;
183 }
184 #endif
185
186 bool wxImage::Create( int width, int height, bool clear )
187 {
188 UnRef();
189
190 m_refData = new wxImageRefData();
191
192 M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
193 if (!M_IMGDATA->m_data)
194 {
195 UnRef();
196 return false;
197 }
198
199 if (clear)
200 memset(M_IMGDATA->m_data, 0, width*height*3);
201
202 M_IMGDATA->m_width = width;
203 M_IMGDATA->m_height = height;
204 M_IMGDATA->m_ok = true;
205
206 return true;
207 }
208
209 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
210 {
211 UnRef();
212
213 wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
214
215 m_refData = new wxImageRefData();
216
217 M_IMGDATA->m_data = data;
218 M_IMGDATA->m_width = width;
219 M_IMGDATA->m_height = height;
220 M_IMGDATA->m_ok = true;
221 M_IMGDATA->m_static = static_data;
222
223 return true;
224 }
225
226 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
227 {
228 UnRef();
229
230 wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
231
232 m_refData = new wxImageRefData();
233
234 M_IMGDATA->m_data = data;
235 M_IMGDATA->m_alpha = alpha;
236 M_IMGDATA->m_width = width;
237 M_IMGDATA->m_height = height;
238 M_IMGDATA->m_ok = true;
239 M_IMGDATA->m_static = static_data;
240 M_IMGDATA->m_staticAlpha = static_data;
241
242 return true;
243 }
244
245 void wxImage::Destroy()
246 {
247 UnRef();
248 }
249
250 wxObjectRefData* wxImage::CreateRefData() const
251 {
252 return new wxImageRefData;
253 }
254
255 wxObjectRefData* wxImage::CloneRefData(const wxObjectRefData* that) const
256 {
257 const wxImageRefData* refData = wx_static_cast(const wxImageRefData*, that);
258 wxCHECK_MSG(refData->m_ok, NULL, wxT("invalid image") );
259
260 wxImageRefData* refData_new = new wxImageRefData;
261 refData_new->m_width = refData->m_width;
262 refData_new->m_height = refData->m_height;
263 refData_new->m_maskRed = refData->m_maskRed;
264 refData_new->m_maskGreen = refData->m_maskGreen;
265 refData_new->m_maskBlue = refData->m_maskBlue;
266 refData_new->m_hasMask = refData->m_hasMask;
267 refData_new->m_ok = true;
268 unsigned size = unsigned(refData->m_width) * unsigned(refData->m_height);
269 if (refData->m_alpha != NULL)
270 {
271 refData_new->m_alpha = (unsigned char*)malloc(size);
272 memcpy(refData_new->m_alpha, refData->m_alpha, size);
273 }
274 size *= 3;
275 refData_new->m_data = (unsigned char*)malloc(size);
276 memcpy(refData_new->m_data, refData->m_data, size);
277 #if wxUSE_PALETTE
278 refData_new->m_palette = refData->m_palette;
279 #endif
280 refData_new->m_optionNames = refData->m_optionNames;
281 refData_new->m_optionValues = refData->m_optionValues;
282 return refData_new;
283 }
284
285 wxImage wxImage::Copy() const
286 {
287 wxImage image;
288
289 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
290
291 image.m_refData = CloneRefData(m_refData);
292
293 return image;
294 }
295
296 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
297 {
298 if( xFactor == 1 && yFactor == 1 )
299 return *this;
300
301 wxImage image;
302
303 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
304
305 // can't scale to/from 0 size
306 wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
307 wxT("invalid new image size") );
308
309 long old_height = M_IMGDATA->m_height,
310 old_width = M_IMGDATA->m_width;
311
312 wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
313 wxT("invalid old image size") );
314
315 long width = old_width / xFactor ;
316 long height = old_height / yFactor ;
317
318 image.Create( width, height, false );
319
320 char unsigned *data = image.GetData();
321
322 wxCHECK_MSG( data, image, wxT("unable to create image") );
323
324 bool hasMask = false ;
325 unsigned char maskRed = 0;
326 unsigned char maskGreen = 0;
327 unsigned char maskBlue =0 ;
328
329 unsigned char *source_data = M_IMGDATA->m_data;
330 unsigned char *target_data = data;
331 unsigned char *source_alpha = 0 ;
332 unsigned char *target_alpha = 0 ;
333 if (M_IMGDATA->m_hasMask)
334 {
335 hasMask = true ;
336 maskRed = M_IMGDATA->m_maskRed;
337 maskGreen = M_IMGDATA->m_maskGreen;
338 maskBlue =M_IMGDATA->m_maskBlue ;
339
340 image.SetMaskColour( M_IMGDATA->m_maskRed,
341 M_IMGDATA->m_maskGreen,
342 M_IMGDATA->m_maskBlue );
343 }
344 else
345 {
346 source_alpha = M_IMGDATA->m_alpha ;
347 if ( source_alpha )
348 {
349 image.SetAlpha() ;
350 target_alpha = image.GetAlpha() ;
351 }
352 }
353
354 for (long y = 0; y < height; y++)
355 {
356 for (long x = 0; x < width; x++)
357 {
358 unsigned long avgRed = 0 ;
359 unsigned long avgGreen = 0;
360 unsigned long avgBlue = 0;
361 unsigned long avgAlpha = 0 ;
362 unsigned long counter = 0 ;
363 // determine average
364 for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
365 {
366 long y_offset = (y * yFactor + y1) * old_width;
367 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
368 {
369 unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
370 unsigned char red = pixel[0] ;
371 unsigned char green = pixel[1] ;
372 unsigned char blue = pixel[2] ;
373 unsigned char alpha = 255 ;
374 if ( source_alpha )
375 alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
376 if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
377 {
378 if ( alpha > 0 )
379 {
380 avgRed += red ;
381 avgGreen += green ;
382 avgBlue += blue ;
383 }
384 avgAlpha += alpha ;
385 counter++ ;
386 }
387 }
388 }
389 if ( counter == 0 )
390 {
391 *(target_data++) = M_IMGDATA->m_maskRed ;
392 *(target_data++) = M_IMGDATA->m_maskGreen ;
393 *(target_data++) = M_IMGDATA->m_maskBlue ;
394 }
395 else
396 {
397 if ( source_alpha )
398 *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
399 *(target_data++) = (unsigned char)(avgRed / counter);
400 *(target_data++) = (unsigned char)(avgGreen / counter);
401 *(target_data++) = (unsigned char)(avgBlue / counter);
402 }
403 }
404 }
405
406 // In case this is a cursor, make sure the hotspot is scaled accordingly:
407 if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
408 image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
409 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
410 if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
411 image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
412 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
413
414 return image;
415 }
416
417 wxImage wxImage::Scale( int width, int height, int quality ) const
418 {
419 wxImage image;
420
421 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
422
423 // can't scale to/from 0 size
424 wxCHECK_MSG( (width > 0) && (height > 0), image,
425 wxT("invalid new image size") );
426
427 long old_height = M_IMGDATA->m_height,
428 old_width = M_IMGDATA->m_width;
429 wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
430 wxT("invalid old image size") );
431
432 // If the image's new width and height are the same as the original, no
433 // need to waste time or CPU cycles
434 if ( old_width == width && old_height == height )
435 return *this;
436
437 // Scale the image (...or more appropriately, resample the image) using
438 // either the high-quality or normal method as specified
439 if ( quality == wxIMAGE_QUALITY_HIGH )
440 {
441 // We need to check whether we are downsampling or upsampling the image
442 if ( width < old_width && height < old_height )
443 {
444 // Downsample the image using the box averaging method for best results
445 image = ResampleBox(width, height);
446 }
447 else
448 {
449 // For upsampling or other random/wierd image dimensions we'll use
450 // a bicubic b-spline scaling method
451 image = ResampleBicubic(width, height);
452 }
453 }
454 else // Default scaling method == simple pixel replication
455 {
456 if ( old_width % width == 0 && old_width >= width &&
457 old_height % height == 0 && old_height >= height )
458 {
459 return ShrinkBy( old_width / width , old_height / height ) ;
460 }
461 image.Create( width, height, false );
462
463 unsigned char *data = image.GetData();
464
465 wxCHECK_MSG( data, image, wxT("unable to create image") );
466
467 unsigned char *source_data = M_IMGDATA->m_data;
468 unsigned char *target_data = data;
469 unsigned char *source_alpha = 0 ;
470 unsigned char *target_alpha = 0 ;
471
472 if ( !M_IMGDATA->m_hasMask )
473 {
474 source_alpha = M_IMGDATA->m_alpha ;
475 if ( source_alpha )
476 {
477 image.SetAlpha() ;
478 target_alpha = image.GetAlpha() ;
479 }
480 }
481
482 long x_delta = (old_width<<16) / width;
483 long y_delta = (old_height<<16) / height;
484
485 unsigned char* dest_pixel = target_data;
486
487 long y = 0;
488 for ( long j = 0; j < height; j++ )
489 {
490 unsigned char* src_line = &source_data[(y>>16)*old_width*3];
491 unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
492
493 long x = 0;
494 for ( long i = 0; i < width; i++ )
495 {
496 unsigned char* src_pixel = &src_line[(x>>16)*3];
497 unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
498 dest_pixel[0] = src_pixel[0];
499 dest_pixel[1] = src_pixel[1];
500 dest_pixel[2] = src_pixel[2];
501 dest_pixel += 3;
502 if ( source_alpha )
503 *(target_alpha++) = *src_alpha_pixel ;
504 x += x_delta;
505 }
506
507 y += y_delta;
508 }
509 }
510
511 // If the original image has a mask, apply the mask to the new image
512 if (M_IMGDATA->m_hasMask)
513 {
514 image.SetMaskColour( M_IMGDATA->m_maskRed,
515 M_IMGDATA->m_maskGreen,
516 M_IMGDATA->m_maskBlue );
517 }
518
519 // In case this is a cursor, make sure the hotspot is scaled accordingly:
520 if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
521 image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
522 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
523 if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
524 image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
525 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
526
527 return image;
528 }
529
530 wxImage wxImage::ResampleBox(int width, int height) const
531 {
532 // This function implements a simple pre-blur/box averaging method for
533 // downsampling that gives reasonably smooth results To scale the image
534 // down we will need to gather a grid of pixels of the size of the scale
535 // factor in each direction and then do an averaging of the pixels.
536
537 wxImage ret_image(width, height, false);
538
539 const double scale_factor_x = double(M_IMGDATA->m_width) / width;
540 const double scale_factor_y = double(M_IMGDATA->m_height) / height;
541
542 const int scale_factor_x_2 = (int)(scale_factor_x / 2);
543 const int scale_factor_y_2 = (int)(scale_factor_y / 2);
544
545 unsigned char* src_data = M_IMGDATA->m_data;
546 unsigned char* src_alpha = M_IMGDATA->m_alpha;
547 unsigned char* dst_data = ret_image.GetData();
548 unsigned char* dst_alpha = NULL;
549
550 if ( src_alpha )
551 {
552 ret_image.SetAlpha();
553 dst_alpha = ret_image.GetAlpha();
554 }
555
556 int averaged_pixels, src_pixel_index;
557 double sum_r, sum_g, sum_b, sum_a;
558
559 for ( int y = 0; y < height; y++ ) // Destination image - Y direction
560 {
561 // Source pixel in the Y direction
562 int src_y = (int)(y * scale_factor_y);
563
564 for ( int x = 0; x < width; x++ ) // Destination image - X direction
565 {
566 // Source pixel in the X direction
567 int src_x = (int)(x * scale_factor_x);
568
569 // Box of pixels to average
570 averaged_pixels = 0;
571 sum_r = sum_g = sum_b = sum_a = 0.0;
572
573 for ( int j = int(src_y - scale_factor_y/2.0 + 1);
574 j <= int(src_y + scale_factor_y_2);
575 j++ )
576 {
577 // We don't care to average pixels that don't exist (edges)
578 if ( j < 0 || j > M_IMGDATA->m_height - 1 )
579 continue;
580
581 for ( int i = int(src_x - scale_factor_x/2.0 + 1);
582 i <= src_x + scale_factor_x_2;
583 i++ )
584 {
585 // Don't average edge pixels
586 if ( i < 0 || i > M_IMGDATA->m_width - 1 )
587 continue;
588
589 // Calculate the actual index in our source pixels
590 src_pixel_index = j * M_IMGDATA->m_width + i;
591
592 sum_r += src_data[src_pixel_index * 3 + 0];
593 sum_g += src_data[src_pixel_index * 3 + 1];
594 sum_b += src_data[src_pixel_index * 3 + 2];
595 if ( src_alpha )
596 sum_a += src_alpha[src_pixel_index];
597
598 averaged_pixels++;
599 }
600 }
601
602 // Calculate the average from the sum and number of averaged pixels
603 dst_data[0] = (unsigned char)(sum_r / averaged_pixels);
604 dst_data[1] = (unsigned char)(sum_g / averaged_pixels);
605 dst_data[2] = (unsigned char)(sum_b / averaged_pixels);
606 dst_data += 3;
607 if ( src_alpha )
608 *dst_alpha++ = (unsigned char)(sum_a / averaged_pixels);
609 }
610 }
611
612 return ret_image;
613 }
614
615 // The following two local functions are for the B-spline weighting of the
616 // bicubic sampling algorithm
617 static inline double spline_cube(double value)
618 {
619 return value <= 0.0 ? 0.0 : value * value * value;
620 }
621
622 static inline double spline_weight(double value)
623 {
624 return (spline_cube(value + 2) -
625 4 * spline_cube(value + 1) +
626 6 * spline_cube(value) -
627 4 * spline_cube(value - 1)) / 6;
628 }
629
630 // This is the bicubic resampling algorithm
631 wxImage wxImage::ResampleBicubic(int width, int height) const
632 {
633 // This function implements a Bicubic B-Spline algorithm for resampling.
634 // This method is certainly a little slower than wxImage's default pixel
635 // replication method, however for most reasonably sized images not being
636 // upsampled too much on a fairly average CPU this difference is hardly
637 // noticeable and the results are far more pleasing to look at.
638 //
639 // This particular bicubic algorithm does pixel weighting according to a
640 // B-Spline that basically implements a Gaussian bell-like weighting
641 // kernel. Because of this method the results may appear a bit blurry when
642 // upsampling by large factors. This is basically because a slight
643 // gaussian blur is being performed to get the smooth look of the upsampled
644 // image.
645
646 // Edge pixels: 3-4 possible solutions
647 // - (Wrap/tile) Wrap the image, take the color value from the opposite
648 // side of the image.
649 // - (Mirror) Duplicate edge pixels, so that pixel at coordinate (2, n),
650 // where n is nonpositive, will have the value of (2, 1).
651 // - (Ignore) Simply ignore the edge pixels and apply the kernel only to
652 // pixels which do have all neighbours.
653 // - (Clamp) Choose the nearest pixel along the border. This takes the
654 // border pixels and extends them out to infinity.
655 //
656 // NOTE: below the y_offset and x_offset variables are being set for edge
657 // pixels using the "Mirror" method mentioned above
658
659 wxImage ret_image;
660
661 ret_image.Create(width, height, false);
662
663 unsigned char* src_data = M_IMGDATA->m_data;
664 unsigned char* src_alpha = M_IMGDATA->m_alpha;
665 unsigned char* dst_data = ret_image.GetData();
666 unsigned char* dst_alpha = NULL;
667
668 if ( src_alpha )
669 {
670 ret_image.SetAlpha();
671 dst_alpha = ret_image.GetAlpha();
672 }
673
674 for ( int dsty = 0; dsty < height; dsty++ )
675 {
676 // We need to calculate the source pixel to interpolate from - Y-axis
677 double srcpixy = double(dsty * M_IMGDATA->m_height) / height;
678 double dy = srcpixy - (int)srcpixy;
679
680 for ( int dstx = 0; dstx < width; dstx++ )
681 {
682 // X-axis of pixel to interpolate from
683 double srcpixx = double(dstx * M_IMGDATA->m_width) / width;
684 double dx = srcpixx - (int)srcpixx;
685
686 // Sums for each color channel
687 double sum_r = 0, sum_g = 0, sum_b = 0, sum_a = 0;
688
689 // Here we actually determine the RGBA values for the destination pixel
690 for ( int k = -1; k <= 2; k++ )
691 {
692 // Y offset
693 int y_offset = srcpixy + k < 0.0
694 ? 0
695 : srcpixy + k >= M_IMGDATA->m_height
696 ? M_IMGDATA->m_height - 1
697 : (int)(srcpixy + k);
698
699 // Loop across the X axis
700 for ( int i = -1; i <= 2; i++ )
701 {
702 // X offset
703 int x_offset = srcpixx + i < 0.0
704 ? 0
705 : srcpixx + i >= M_IMGDATA->m_width
706 ? M_IMGDATA->m_width - 1
707 : (int)(srcpixx + i);
708
709 // Calculate the exact position where the source data
710 // should be pulled from based on the x_offset and y_offset
711 int src_pixel_index = y_offset*M_IMGDATA->m_width + x_offset;
712
713 // Calculate the weight for the specified pixel according
714 // to the bicubic b-spline kernel we're using for
715 // interpolation
716 double
717 pixel_weight = spline_weight(i - dx)*spline_weight(k - dy);
718
719 // Create a sum of all velues for each color channel
720 // adjusted for the pixel's calculated weight
721 sum_r += src_data[src_pixel_index * 3 + 0] * pixel_weight;
722 sum_g += src_data[src_pixel_index * 3 + 1] * pixel_weight;
723 sum_b += src_data[src_pixel_index * 3 + 2] * pixel_weight;
724 if ( src_alpha )
725 sum_a += src_alpha[src_pixel_index] * pixel_weight;
726 }
727 }
728
729 // Put the data into the destination image. The summed values are
730 // of double data type and are rounded here for accuracy
731 dst_data[0] = (unsigned char)(sum_r + 0.5);
732 dst_data[1] = (unsigned char)(sum_g + 0.5);
733 dst_data[2] = (unsigned char)(sum_b + 0.5);
734 dst_data += 3;
735
736 if ( src_alpha )
737 *dst_alpha++ = (unsigned char)sum_a;
738 }
739 }
740
741 return ret_image;
742 }
743
744 // Blur in the horizontal direction
745 wxImage wxImage::BlurHorizontal(int blurRadius)
746 {
747 wxImage ret_image;
748 ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
749
750 unsigned char* src_data = M_IMGDATA->m_data;
751 unsigned char* dst_data = ret_image.GetData();
752 unsigned char* src_alpha = M_IMGDATA->m_alpha;
753 unsigned char* dst_alpha = NULL;
754
755 // Check for a mask or alpha
756 if ( M_IMGDATA->m_hasMask )
757 {
758 ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
759 M_IMGDATA->m_maskGreen,
760 M_IMGDATA->m_maskBlue);
761 }
762 else
763 {
764 if ( src_alpha )
765 {
766 ret_image.SetAlpha();
767 dst_alpha = ret_image.GetAlpha();
768 }
769 }
770
771 // number of pixels we average over
772 const int blurArea = blurRadius*2 + 1;
773
774 // Horizontal blurring algorithm - average all pixels in the specified blur
775 // radius in the X or horizontal direction
776 for ( int y = 0; y < M_IMGDATA->m_height; y++ )
777 {
778 // Variables used in the blurring algorithm
779 long sum_r = 0,
780 sum_g = 0,
781 sum_b = 0,
782 sum_a = 0;
783
784 long pixel_idx;
785 const unsigned char *src;
786 unsigned char *dst;
787
788 // Calculate the average of all pixels in the blur radius for the first
789 // pixel of the row
790 for ( int kernel_x = -blurRadius; kernel_x <= blurRadius; kernel_x++ )
791 {
792 // To deal with the pixels at the start of a row so it's not
793 // grabbing GOK values from memory at negative indices of the
794 // image's data or grabbing from the previous row
795 if ( kernel_x < 0 )
796 pixel_idx = y * M_IMGDATA->m_width;
797 else
798 pixel_idx = kernel_x + y * M_IMGDATA->m_width;
799
800 src = src_data + pixel_idx*3;
801 sum_r += src[0];
802 sum_g += src[1];
803 sum_b += src[2];
804 if ( src_alpha )
805 sum_a += src_alpha[pixel_idx];
806 }
807
808 dst = dst_data + y * M_IMGDATA->m_width*3;
809 dst[0] = (unsigned char)(sum_r / blurArea);
810 dst[1] = (unsigned char)(sum_g / blurArea);
811 dst[2] = (unsigned char)(sum_b / blurArea);
812 if ( src_alpha )
813 dst_alpha[y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
814
815 // Now average the values of the rest of the pixels by just moving the
816 // blur radius box along the row
817 for ( int x = 1; x < M_IMGDATA->m_width; x++ )
818 {
819 // Take care of edge pixels on the left edge by essentially
820 // duplicating the edge pixel
821 if ( x - blurRadius - 1 < 0 )
822 pixel_idx = y * M_IMGDATA->m_width;
823 else
824 pixel_idx = (x - blurRadius - 1) + y * M_IMGDATA->m_width;
825
826 // Subtract the value of the pixel at the left side of the blur
827 // radius box
828 src = src_data + pixel_idx*3;
829 sum_r -= src[0];
830 sum_g -= src[1];
831 sum_b -= src[2];
832 if ( src_alpha )
833 sum_a -= src_alpha[pixel_idx];
834
835 // Take care of edge pixels on the right edge
836 if ( x + blurRadius > M_IMGDATA->m_width - 1 )
837 pixel_idx = M_IMGDATA->m_width - 1 + y * M_IMGDATA->m_width;
838 else
839 pixel_idx = x + blurRadius + y * M_IMGDATA->m_width;
840
841 // Add the value of the pixel being added to the end of our box
842 src = src_data + pixel_idx*3;
843 sum_r += src[0];
844 sum_g += src[1];
845 sum_b += src[2];
846 if ( src_alpha )
847 sum_a += src_alpha[pixel_idx];
848
849 // Save off the averaged data
850 dst = dst_data + x*3 + y*M_IMGDATA->m_width*3;
851 dst[0] = (unsigned char)(sum_r / blurArea);
852 dst[1] = (unsigned char)(sum_g / blurArea);
853 dst[2] = (unsigned char)(sum_b / blurArea);
854 if ( src_alpha )
855 dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
856 }
857 }
858
859 return ret_image;
860 }
861
862 // Blur in the vertical direction
863 wxImage wxImage::BlurVertical(int blurRadius)
864 {
865 wxImage ret_image;
866 ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
867
868 unsigned char* src_data = M_IMGDATA->m_data;
869 unsigned char* dst_data = ret_image.GetData();
870 unsigned char* src_alpha = M_IMGDATA->m_alpha;
871 unsigned char* dst_alpha = NULL;
872
873 // Check for a mask or alpha
874 if ( M_IMGDATA->m_hasMask )
875 {
876 ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
877 M_IMGDATA->m_maskGreen,
878 M_IMGDATA->m_maskBlue);
879 }
880 else
881 {
882 if ( src_alpha )
883 {
884 ret_image.SetAlpha();
885 dst_alpha = ret_image.GetAlpha();
886 }
887 }
888
889 // number of pixels we average over
890 const int blurArea = blurRadius*2 + 1;
891
892 // Vertical blurring algorithm - same as horizontal but switched the
893 // opposite direction
894 for ( int x = 0; x < M_IMGDATA->m_width; x++ )
895 {
896 // Variables used in the blurring algorithm
897 long sum_r = 0,
898 sum_g = 0,
899 sum_b = 0,
900 sum_a = 0;
901
902 long pixel_idx;
903 const unsigned char *src;
904 unsigned char *dst;
905
906 // Calculate the average of all pixels in our blur radius box for the
907 // first pixel of the column
908 for ( int kernel_y = -blurRadius; kernel_y <= blurRadius; kernel_y++ )
909 {
910 // To deal with the pixels at the start of a column so it's not
911 // grabbing GOK values from memory at negative indices of the
912 // image's data or grabbing from the previous column
913 if ( kernel_y < 0 )
914 pixel_idx = x;
915 else
916 pixel_idx = x + kernel_y * M_IMGDATA->m_width;
917
918 src = src_data + pixel_idx*3;
919 sum_r += src[0];
920 sum_g += src[1];
921 sum_b += src[2];
922 if ( src_alpha )
923 sum_a += src_alpha[pixel_idx];
924 }
925
926 dst = dst_data + x*3;
927 dst[0] = (unsigned char)(sum_r / blurArea);
928 dst[1] = (unsigned char)(sum_g / blurArea);
929 dst[2] = (unsigned char)(sum_b / blurArea);
930 if ( src_alpha )
931 dst_alpha[x] = (unsigned char)(sum_a / blurArea);
932
933 // Now average the values of the rest of the pixels by just moving the
934 // box along the column from top to bottom
935 for ( int y = 1; y < M_IMGDATA->m_height; y++ )
936 {
937 // Take care of pixels that would be beyond the top edge by
938 // duplicating the top edge pixel for the column
939 if ( y - blurRadius - 1 < 0 )
940 pixel_idx = x;
941 else
942 pixel_idx = x + (y - blurRadius - 1) * M_IMGDATA->m_width;
943
944 // Subtract the value of the pixel at the top of our blur radius box
945 src = src_data + pixel_idx*3;
946 sum_r -= src[0];
947 sum_g -= src[1];
948 sum_b -= src[2];
949 if ( src_alpha )
950 sum_a -= src_alpha[pixel_idx];
951
952 // Take care of the pixels that would be beyond the bottom edge of
953 // the image similar to the top edge
954 if ( y + blurRadius > M_IMGDATA->m_height - 1 )
955 pixel_idx = x + (M_IMGDATA->m_height - 1) * M_IMGDATA->m_width;
956 else
957 pixel_idx = x + (blurRadius + y) * M_IMGDATA->m_width;
958
959 // Add the value of the pixel being added to the end of our box
960 src = src_data + pixel_idx*3;
961 sum_r += src[0];
962 sum_g += src[1];
963 sum_b += src[2];
964 if ( src_alpha )
965 sum_a += src_alpha[pixel_idx];
966
967 // Save off the averaged data
968 dst = dst_data + (x + y * M_IMGDATA->m_width) * 3;
969 dst[0] = (unsigned char)(sum_r / blurArea);
970 dst[1] = (unsigned char)(sum_g / blurArea);
971 dst[2] = (unsigned char)(sum_b / blurArea);
972 if ( src_alpha )
973 dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
974 }
975 }
976
977 return ret_image;
978 }
979
980 // The new blur function
981 wxImage wxImage::Blur(int blurRadius)
982 {
983 wxImage ret_image;
984 ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
985
986 // Blur the image in each direction
987 ret_image = BlurHorizontal(blurRadius);
988 ret_image = ret_image.BlurVertical(blurRadius);
989
990 return ret_image;
991 }
992
993 wxImage wxImage::Rotate90( bool clockwise ) const
994 {
995 wxImage image;
996
997 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
998
999 image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
1000
1001 unsigned char *data = image.GetData();
1002
1003 wxCHECK_MSG( data, image, wxT("unable to create image") );
1004
1005 unsigned char *source_data = M_IMGDATA->m_data;
1006 unsigned char *target_data;
1007 unsigned char *alpha_data = 0 ;
1008 unsigned char *source_alpha = 0 ;
1009 unsigned char *target_alpha = 0 ;
1010
1011 if (M_IMGDATA->m_hasMask)
1012 {
1013 image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1014 }
1015 else
1016 {
1017 source_alpha = M_IMGDATA->m_alpha ;
1018 if ( source_alpha )
1019 {
1020 image.SetAlpha() ;
1021 alpha_data = image.GetAlpha() ;
1022 }
1023 }
1024
1025 long height = M_IMGDATA->m_height;
1026 long width = M_IMGDATA->m_width;
1027
1028 for (long j = 0; j < height; j++)
1029 {
1030 for (long i = 0; i < width; i++)
1031 {
1032 if (clockwise)
1033 {
1034 target_data = data + (((i+1)*height) - j - 1)*3;
1035 if(source_alpha)
1036 target_alpha = alpha_data + (((i+1)*height) - j - 1);
1037 }
1038 else
1039 {
1040 target_data = data + ((height*(width-1)) + j - (i*height))*3;
1041 if(source_alpha)
1042 target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
1043 }
1044 memcpy( target_data, source_data, 3 );
1045 source_data += 3;
1046
1047 if(source_alpha)
1048 {
1049 memcpy( target_alpha, source_alpha, 1 );
1050 source_alpha += 1;
1051 }
1052 }
1053 }
1054
1055 return image;
1056 }
1057
1058 wxImage wxImage::Mirror( bool horizontally ) const
1059 {
1060 wxImage image;
1061
1062 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1063
1064 image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1065
1066 unsigned char *data = image.GetData();
1067 unsigned char *alpha = NULL;
1068
1069 wxCHECK_MSG( data, image, wxT("unable to create image") );
1070
1071 if (M_IMGDATA->m_alpha != NULL) {
1072 image.SetAlpha();
1073 alpha = image.GetAlpha();
1074 wxCHECK_MSG( alpha, image, wxT("unable to create alpha channel") );
1075 }
1076
1077 if (M_IMGDATA->m_hasMask)
1078 image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1079
1080 long height = M_IMGDATA->m_height;
1081 long width = M_IMGDATA->m_width;
1082
1083 unsigned char *source_data = M_IMGDATA->m_data;
1084 unsigned char *target_data;
1085
1086 if (horizontally)
1087 {
1088 for (long j = 0; j < height; j++)
1089 {
1090 data += width*3;
1091 target_data = data-3;
1092 for (long i = 0; i < width; i++)
1093 {
1094 memcpy( target_data, source_data, 3 );
1095 source_data += 3;
1096 target_data -= 3;
1097 }
1098 }
1099
1100 if (alpha != NULL)
1101 {
1102 // src_alpha starts at the first pixel and increases by 1 after each step
1103 // (a step here is the copy of the alpha value of one pixel)
1104 const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1105 // dest_alpha starts just beyond the first line, decreases before each step,
1106 // and after each line is finished, increases by 2 widths (skipping the line
1107 // just copied and the line that will be copied next)
1108 unsigned char *dest_alpha = alpha + width;
1109
1110 for (long jj = 0; jj < height; ++jj)
1111 {
1112 for (long i = 0; i < width; ++i) {
1113 *(--dest_alpha) = *(src_alpha++); // copy one pixel
1114 }
1115 dest_alpha += 2 * width; // advance beyond the end of the next line
1116 }
1117 }
1118 }
1119 else
1120 {
1121 for (long i = 0; i < height; i++)
1122 {
1123 target_data = data + 3*width*(height-1-i);
1124 memcpy( target_data, source_data, (size_t)3*width );
1125 source_data += 3*width;
1126 }
1127
1128 if (alpha != NULL)
1129 {
1130 // src_alpha starts at the first pixel and increases by 1 width after each step
1131 // (a step here is the copy of the alpha channel of an entire line)
1132 const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1133 // dest_alpha starts just beyond the last line (beyond the whole image)
1134 // and decreases by 1 width before each step
1135 unsigned char *dest_alpha = alpha + width * height;
1136
1137 for (long jj = 0; jj < height; ++jj)
1138 {
1139 dest_alpha -= width;
1140 memcpy( dest_alpha, src_alpha, (size_t)width );
1141 src_alpha += width;
1142 }
1143 }
1144 }
1145
1146 return image;
1147 }
1148
1149 wxImage wxImage::GetSubImage( const wxRect &rect ) const
1150 {
1151 wxImage image;
1152
1153 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1154
1155 wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
1156 (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
1157 image, wxT("invalid subimage size") );
1158
1159 const int subwidth = rect.GetWidth();
1160 const int subheight = rect.GetHeight();
1161
1162 image.Create( subwidth, subheight, false );
1163
1164 const unsigned char *src_data = GetData();
1165 const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1166 unsigned char *subdata = image.GetData();
1167 unsigned char *subalpha = NULL;
1168
1169 wxCHECK_MSG( subdata, image, wxT("unable to create image") );
1170
1171 if (src_alpha != NULL) {
1172 image.SetAlpha();
1173 subalpha = image.GetAlpha();
1174 wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
1175 }
1176
1177 if (M_IMGDATA->m_hasMask)
1178 image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1179
1180 const int width = GetWidth();
1181 const int pixsoff = rect.GetLeft() + width * rect.GetTop();
1182
1183 src_data += 3 * pixsoff;
1184 src_alpha += pixsoff; // won't be used if was NULL, so this is ok
1185
1186 for (long j = 0; j < subheight; ++j)
1187 {
1188 memcpy( subdata, src_data, 3 * subwidth );
1189 subdata += 3 * subwidth;
1190 src_data += 3 * width;
1191 if (subalpha != NULL) {
1192 memcpy( subalpha, src_alpha, subwidth );
1193 subalpha += subwidth;
1194 src_alpha += width;
1195 }
1196 }
1197
1198 return image;
1199 }
1200
1201 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
1202 int r_, int g_, int b_ ) const
1203 {
1204 wxImage image;
1205
1206 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1207 wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
1208
1209 int width = GetWidth(), height = GetHeight();
1210 image.Create(size.GetWidth(), size.GetHeight(), false);
1211
1212 unsigned char r = (unsigned char)r_;
1213 unsigned char g = (unsigned char)g_;
1214 unsigned char b = (unsigned char)b_;
1215 if ((r_ == -1) && (g_ == -1) && (b_ == -1))
1216 {
1217 GetOrFindMaskColour( &r, &g, &b );
1218 image.SetMaskColour(r, g, b);
1219 }
1220
1221 image.SetRGB(wxRect(), r, g, b);
1222
1223 wxRect subRect(pos.x, pos.y, width, height);
1224 wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
1225 if (pos.x < 0)
1226 finalRect.width -= pos.x;
1227 if (pos.y < 0)
1228 finalRect.height -= pos.y;
1229
1230 subRect.Intersect(finalRect);
1231
1232 if (!subRect.IsEmpty())
1233 {
1234 if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
1235 image.Paste(*this, pos.x, pos.y);
1236 else
1237 image.Paste(GetSubImage(subRect), pos.x, pos.y);
1238 }
1239
1240 return image;
1241 }
1242
1243 void wxImage::Paste( const wxImage &image, int x, int y )
1244 {
1245 wxCHECK_RET( Ok(), wxT("invalid image") );
1246 wxCHECK_RET( image.Ok(), wxT("invalid image") );
1247
1248 AllocExclusive();
1249
1250 int xx = 0;
1251 int yy = 0;
1252 int width = image.GetWidth();
1253 int height = image.GetHeight();
1254
1255 if (x < 0)
1256 {
1257 xx = -x;
1258 width += x;
1259 }
1260 if (y < 0)
1261 {
1262 yy = -y;
1263 height += y;
1264 }
1265
1266 if ((x+xx)+width > M_IMGDATA->m_width)
1267 width = M_IMGDATA->m_width - (x+xx);
1268 if ((y+yy)+height > M_IMGDATA->m_height)
1269 height = M_IMGDATA->m_height - (y+yy);
1270
1271 if (width < 1) return;
1272 if (height < 1) return;
1273
1274 if ((!HasMask() && !image.HasMask()) ||
1275 (HasMask() && !image.HasMask()) ||
1276 ((HasMask() && image.HasMask() &&
1277 (GetMaskRed()==image.GetMaskRed()) &&
1278 (GetMaskGreen()==image.GetMaskGreen()) &&
1279 (GetMaskBlue()==image.GetMaskBlue()))))
1280 {
1281 unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1282 int source_step = image.GetWidth()*3;
1283
1284 unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1285 int target_step = M_IMGDATA->m_width*3;
1286 for (int j = 0; j < height; j++)
1287 {
1288 memcpy( target_data, source_data, width*3 );
1289 source_data += source_step;
1290 target_data += target_step;
1291 }
1292 }
1293
1294 // Copy over the alpha channel from the original image
1295 if ( image.HasAlpha() )
1296 {
1297 if ( !HasAlpha() )
1298 InitAlpha();
1299
1300 unsigned char* source_data = image.GetAlpha() + xx + yy*image.GetWidth();
1301 int source_step = image.GetWidth();
1302
1303 unsigned char* target_data = GetAlpha() + (x+xx) + (y+yy)*M_IMGDATA->m_width;
1304 int target_step = M_IMGDATA->m_width;
1305
1306 for (int j = 0; j < height; j++,
1307 source_data += source_step,
1308 target_data += target_step)
1309 {
1310 memcpy( target_data, source_data, width );
1311 }
1312 }
1313
1314 if (!HasMask() && image.HasMask())
1315 {
1316 unsigned char r = image.GetMaskRed();
1317 unsigned char g = image.GetMaskGreen();
1318 unsigned char b = image.GetMaskBlue();
1319
1320 unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1321 int source_step = image.GetWidth()*3;
1322
1323 unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1324 int target_step = M_IMGDATA->m_width*3;
1325
1326 for (int j = 0; j < height; j++)
1327 {
1328 for (int i = 0; i < width*3; i+=3)
1329 {
1330 if ((source_data[i] != r) ||
1331 (source_data[i+1] != g) ||
1332 (source_data[i+2] != b))
1333 {
1334 memcpy( target_data+i, source_data+i, 3 );
1335 }
1336 }
1337 source_data += source_step;
1338 target_data += target_step;
1339 }
1340 }
1341 }
1342
1343 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
1344 unsigned char r2, unsigned char g2, unsigned char b2 )
1345 {
1346 wxCHECK_RET( Ok(), wxT("invalid image") );
1347
1348 AllocExclusive();
1349
1350 unsigned char *data = GetData();
1351
1352 const int w = GetWidth();
1353 const int h = GetHeight();
1354
1355 for (int j = 0; j < h; j++)
1356 for (int i = 0; i < w; i++)
1357 {
1358 if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
1359 {
1360 data[0] = r2;
1361 data[1] = g2;
1362 data[2] = b2;
1363 }
1364 data += 3;
1365 }
1366 }
1367
1368 wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
1369 {
1370 wxImage image;
1371
1372 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1373
1374 image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
1375
1376 unsigned char *dest = image.GetData();
1377
1378 wxCHECK_MSG( dest, image, wxT("unable to create image") );
1379
1380 unsigned char *src = M_IMGDATA->m_data;
1381 bool hasMask = M_IMGDATA->m_hasMask;
1382 unsigned char maskRed = M_IMGDATA->m_maskRed;
1383 unsigned char maskGreen = M_IMGDATA->m_maskGreen;
1384 unsigned char maskBlue = M_IMGDATA->m_maskBlue;
1385
1386 if ( hasMask )
1387 image.SetMaskColour(maskRed, maskGreen, maskBlue);
1388
1389 const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
1390 for ( long i = 0; i < size; i++, src += 3, dest += 3 )
1391 {
1392 // don't modify the mask
1393 if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
1394 {
1395 memcpy(dest, src, 3);
1396 }
1397 else
1398 {
1399 // calculate the luma
1400 double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5;
1401 dest[0] = dest[1] = dest[2] = wx_static_cast(unsigned char, luma);
1402 }
1403 }
1404
1405 // copy the alpha channel, if any
1406 if (HasAlpha())
1407 {
1408 const size_t alphaSize = GetWidth() * GetHeight();
1409 unsigned char *alpha = (unsigned char*)malloc(alphaSize);
1410 memcpy(alpha, GetAlpha(), alphaSize);
1411 image.InitAlpha();
1412 image.SetAlpha(alpha);
1413 }
1414
1415 return image;
1416 }
1417
1418 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
1419 {
1420 wxImage image;
1421
1422 wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1423
1424 image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1425
1426 unsigned char *data = image.GetData();
1427
1428 wxCHECK_MSG( data, image, wxT("unable to create image") );
1429
1430 if (M_IMGDATA->m_hasMask)
1431 {
1432 if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
1433 M_IMGDATA->m_maskBlue == b)
1434 image.SetMaskColour( 255, 255, 255 );
1435 else
1436 image.SetMaskColour( 0, 0, 0 );
1437 }
1438
1439 long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
1440
1441 unsigned char *srcd = M_IMGDATA->m_data;
1442 unsigned char *tard = image.GetData();
1443
1444 for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
1445 {
1446 if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
1447 tard[0] = tard[1] = tard[2] = 255;
1448 else
1449 tard[0] = tard[1] = tard[2] = 0;
1450 }
1451
1452 return image;
1453 }
1454
1455 int wxImage::GetWidth() const
1456 {
1457 wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1458
1459 return M_IMGDATA->m_width;
1460 }
1461
1462 int wxImage::GetHeight() const
1463 {
1464 wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1465
1466 return M_IMGDATA->m_height;
1467 }
1468
1469 long wxImage::XYToIndex(int x, int y) const
1470 {
1471 if ( Ok() &&
1472 x >= 0 && y >= 0 &&
1473 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
1474 {
1475 return y*M_IMGDATA->m_width + x;
1476 }
1477
1478 return -1;
1479 }
1480
1481 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
1482 {
1483 long pos = XYToIndex(x, y);
1484 wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1485
1486 AllocExclusive();
1487
1488 pos *= 3;
1489
1490 M_IMGDATA->m_data[ pos ] = r;
1491 M_IMGDATA->m_data[ pos+1 ] = g;
1492 M_IMGDATA->m_data[ pos+2 ] = b;
1493 }
1494
1495 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
1496 {
1497 wxCHECK_RET( Ok(), wxT("invalid image") );
1498
1499 AllocExclusive();
1500
1501 wxRect rect(rect_);
1502 wxRect imageRect(0, 0, GetWidth(), GetHeight());
1503 if ( rect == wxRect() )
1504 {
1505 rect = imageRect;
1506 }
1507 else
1508 {
1509 wxCHECK_RET( imageRect.Contains(rect.GetTopLeft()) &&
1510 imageRect.Contains(rect.GetBottomRight()),
1511 wxT("invalid bounding rectangle") );
1512 }
1513
1514 int x1 = rect.GetLeft(),
1515 y1 = rect.GetTop(),
1516 x2 = rect.GetRight() + 1,
1517 y2 = rect.GetBottom() + 1;
1518
1519 unsigned char *data wxDUMMY_INITIALIZE(NULL);
1520 int x, y, width = GetWidth();
1521 for (y = y1; y < y2; y++)
1522 {
1523 data = M_IMGDATA->m_data + (y*width + x1)*3;
1524 for (x = x1; x < x2; x++)
1525 {
1526 *data++ = r;
1527 *data++ = g;
1528 *data++ = b;
1529 }
1530 }
1531 }
1532
1533 unsigned char wxImage::GetRed( int x, int y ) const
1534 {
1535 long pos = XYToIndex(x, y);
1536 wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1537
1538 pos *= 3;
1539
1540 return M_IMGDATA->m_data[pos];
1541 }
1542
1543 unsigned char wxImage::GetGreen( int x, int y ) const
1544 {
1545 long pos = XYToIndex(x, y);
1546 wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1547
1548 pos *= 3;
1549
1550 return M_IMGDATA->m_data[pos+1];
1551 }
1552
1553 unsigned char wxImage::GetBlue( int x, int y ) const
1554 {
1555 long pos = XYToIndex(x, y);
1556 wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1557
1558 pos *= 3;
1559
1560 return M_IMGDATA->m_data[pos+2];
1561 }
1562
1563 bool wxImage::IsOk() const
1564 {
1565 // image of 0 width or height can't be considered ok - at least because it
1566 // causes crashes in ConvertToBitmap() if we don't catch it in time
1567 wxImageRefData *data = M_IMGDATA;
1568 return data && data->m_ok && data->m_width && data->m_height;
1569 }
1570
1571 unsigned char *wxImage::GetData() const
1572 {
1573 wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1574
1575 return M_IMGDATA->m_data;
1576 }
1577
1578 void wxImage::SetData( unsigned char *data, bool static_data )
1579 {
1580 wxCHECK_RET( Ok(), wxT("invalid image") );
1581
1582 wxImageRefData *newRefData = new wxImageRefData();
1583
1584 newRefData->m_width = M_IMGDATA->m_width;
1585 newRefData->m_height = M_IMGDATA->m_height;
1586 newRefData->m_data = data;
1587 newRefData->m_ok = true;
1588 newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1589 newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1590 newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1591 newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1592 newRefData->m_static = static_data;
1593
1594 UnRef();
1595
1596 m_refData = newRefData;
1597 }
1598
1599 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
1600 {
1601 wxImageRefData *newRefData = new wxImageRefData();
1602
1603 if (m_refData)
1604 {
1605 newRefData->m_width = new_width;
1606 newRefData->m_height = new_height;
1607 newRefData->m_data = data;
1608 newRefData->m_ok = true;
1609 newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1610 newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1611 newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1612 newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1613 }
1614 else
1615 {
1616 newRefData->m_width = new_width;
1617 newRefData->m_height = new_height;
1618 newRefData->m_data = data;
1619 newRefData->m_ok = true;
1620 }
1621 newRefData->m_static = static_data;
1622
1623 UnRef();
1624
1625 m_refData = newRefData;
1626 }
1627
1628 // ----------------------------------------------------------------------------
1629 // alpha channel support
1630 // ----------------------------------------------------------------------------
1631
1632 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
1633 {
1634 wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
1635
1636 long pos = XYToIndex(x, y);
1637 wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1638
1639 AllocExclusive();
1640
1641 M_IMGDATA->m_alpha[pos] = alpha;
1642 }
1643
1644 unsigned char wxImage::GetAlpha(int x, int y) const
1645 {
1646 wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
1647
1648 long pos = XYToIndex(x, y);
1649 wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1650
1651 return M_IMGDATA->m_alpha[pos];
1652 }
1653
1654 bool
1655 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1656 {
1657 SetAlpha(NULL);
1658
1659 const int w = M_IMGDATA->m_width;
1660 const int h = M_IMGDATA->m_height;
1661
1662 unsigned char *alpha = GetAlpha();
1663 unsigned char *data = GetData();
1664
1665 for ( int y = 0; y < h; y++ )
1666 {
1667 for ( int x = 0; x < w; x++ )
1668 {
1669 *alpha++ = *data;
1670 *data++ = r;
1671 *data++ = g;
1672 *data++ = b;
1673 }
1674 }
1675
1676 return true;
1677 }
1678
1679 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1680 {
1681 wxCHECK_RET( Ok(), wxT("invalid image") );
1682
1683 AllocExclusive();
1684
1685 if ( !alpha )
1686 {
1687 alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1688 }
1689
1690 if( !M_IMGDATA->m_staticAlpha )
1691 free(M_IMGDATA->m_alpha);
1692
1693 M_IMGDATA->m_alpha = alpha;
1694 M_IMGDATA->m_staticAlpha = static_data;
1695 }
1696
1697 unsigned char *wxImage::GetAlpha() const
1698 {
1699 wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1700
1701 return M_IMGDATA->m_alpha;
1702 }
1703
1704 void wxImage::InitAlpha()
1705 {
1706 wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1707
1708 // initialize memory for alpha channel
1709 SetAlpha();
1710
1711 unsigned char *alpha = M_IMGDATA->m_alpha;
1712 const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1713
1714 if ( HasMask() )
1715 {
1716 // use the mask to initialize the alpha channel.
1717 const unsigned char * const alphaEnd = alpha + lenAlpha;
1718
1719 const unsigned char mr = M_IMGDATA->m_maskRed;
1720 const unsigned char mg = M_IMGDATA->m_maskGreen;
1721 const unsigned char mb = M_IMGDATA->m_maskBlue;
1722 for ( unsigned char *src = M_IMGDATA->m_data;
1723 alpha < alphaEnd;
1724 src += 3, alpha++ )
1725 {
1726 *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1727 ? wxIMAGE_ALPHA_TRANSPARENT
1728 : wxIMAGE_ALPHA_OPAQUE;
1729 }
1730
1731 M_IMGDATA->m_hasMask = false;
1732 }
1733 else // no mask
1734 {
1735 // make the image fully opaque
1736 memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1737 }
1738 }
1739
1740 // ----------------------------------------------------------------------------
1741 // mask support
1742 // ----------------------------------------------------------------------------
1743
1744 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1745 {
1746 wxCHECK_RET( Ok(), wxT("invalid image") );
1747
1748 AllocExclusive();
1749
1750 M_IMGDATA->m_maskRed = r;
1751 M_IMGDATA->m_maskGreen = g;
1752 M_IMGDATA->m_maskBlue = b;
1753 M_IMGDATA->m_hasMask = true;
1754 }
1755
1756 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1757 {
1758 wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1759
1760 if (M_IMGDATA->m_hasMask)
1761 {
1762 if (r) *r = M_IMGDATA->m_maskRed;
1763 if (g) *g = M_IMGDATA->m_maskGreen;
1764 if (b) *b = M_IMGDATA->m_maskBlue;
1765 return true;
1766 }
1767 else
1768 {
1769 FindFirstUnusedColour(r, g, b);
1770 return false;
1771 }
1772 }
1773
1774 unsigned char wxImage::GetMaskRed() const
1775 {
1776 wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1777
1778 return M_IMGDATA->m_maskRed;
1779 }
1780
1781 unsigned char wxImage::GetMaskGreen() const
1782 {
1783 wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1784
1785 return M_IMGDATA->m_maskGreen;
1786 }
1787
1788 unsigned char wxImage::GetMaskBlue() const
1789 {
1790 wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1791
1792 return M_IMGDATA->m_maskBlue;
1793 }
1794
1795 void wxImage::SetMask( bool mask )
1796 {
1797 wxCHECK_RET( Ok(), wxT("invalid image") );
1798
1799 AllocExclusive();
1800
1801 M_IMGDATA->m_hasMask = mask;
1802 }
1803
1804 bool wxImage::HasMask() const
1805 {
1806 wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1807
1808 return M_IMGDATA->m_hasMask;
1809 }
1810
1811 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1812 {
1813 long pos = XYToIndex(x, y);
1814 wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1815
1816 // check mask
1817 if ( M_IMGDATA->m_hasMask )
1818 {
1819 const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1820 if ( p[0] == M_IMGDATA->m_maskRed &&
1821 p[1] == M_IMGDATA->m_maskGreen &&
1822 p[2] == M_IMGDATA->m_maskBlue )
1823 {
1824 return true;
1825 }
1826 }
1827
1828 // then check alpha
1829 if ( M_IMGDATA->m_alpha )
1830 {
1831 if ( M_IMGDATA->m_alpha[pos] < threshold )
1832 {
1833 // transparent enough
1834 return true;
1835 }
1836 }
1837
1838 // not transparent
1839 return false;
1840 }
1841
1842 bool wxImage::SetMaskFromImage(const wxImage& mask,
1843 unsigned char mr, unsigned char mg, unsigned char mb)
1844 {
1845 // check that the images are the same size
1846 if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1847 {
1848 wxLogError( _("Image and mask have different sizes.") );
1849 return false;
1850 }
1851
1852 // find unused colour
1853 unsigned char r,g,b ;
1854 if (!FindFirstUnusedColour(&r, &g, &b))
1855 {
1856 wxLogError( _("No unused colour in image being masked.") );
1857 return false ;
1858 }
1859
1860 AllocExclusive();
1861
1862 unsigned char *imgdata = GetData();
1863 unsigned char *maskdata = mask.GetData();
1864
1865 const int w = GetWidth();
1866 const int h = GetHeight();
1867
1868 for (int j = 0; j < h; j++)
1869 {
1870 for (int i = 0; i < w; i++)
1871 {
1872 if ((maskdata[0] == mr) && (maskdata[1] == mg) && (maskdata[2] == mb))
1873 {
1874 imgdata[0] = r;
1875 imgdata[1] = g;
1876 imgdata[2] = b;
1877 }
1878 imgdata += 3;
1879 maskdata += 3;
1880 }
1881 }
1882
1883 SetMaskColour(r, g, b);
1884 SetMask(true);
1885
1886 return true;
1887 }
1888
1889 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1890 {
1891 if (!HasAlpha())
1892 return true;
1893
1894 unsigned char mr, mg, mb;
1895 if (!FindFirstUnusedColour(&mr, &mg, &mb))
1896 {
1897 wxLogError( _("No unused colour in image being masked.") );
1898 return false;
1899 }
1900
1901 AllocExclusive();
1902
1903 SetMask(true);
1904 SetMaskColour(mr, mg, mb);
1905
1906 unsigned char *imgdata = GetData();
1907 unsigned char *alphadata = GetAlpha();
1908
1909 int w = GetWidth();
1910 int h = GetHeight();
1911
1912 for (int y = 0; y < h; y++)
1913 {
1914 for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1915 {
1916 if (*alphadata < threshold)
1917 {
1918 imgdata[0] = mr;
1919 imgdata[1] = mg;
1920 imgdata[2] = mb;
1921 }
1922 }
1923 }
1924
1925 if( !M_IMGDATA->m_staticAlpha )
1926 free(M_IMGDATA->m_alpha);
1927
1928 M_IMGDATA->m_alpha = NULL;
1929 M_IMGDATA->m_staticAlpha = false;
1930
1931 return true;
1932 }
1933
1934 // ----------------------------------------------------------------------------
1935 // Palette functions
1936 // ----------------------------------------------------------------------------
1937
1938 #if wxUSE_PALETTE
1939
1940 bool wxImage::HasPalette() const
1941 {
1942 if (!Ok())
1943 return false;
1944
1945 return M_IMGDATA->m_palette.Ok();
1946 }
1947
1948 const wxPalette& wxImage::GetPalette() const
1949 {
1950 wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1951
1952 return M_IMGDATA->m_palette;
1953 }
1954
1955 void wxImage::SetPalette(const wxPalette& palette)
1956 {
1957 wxCHECK_RET( Ok(), wxT("invalid image") );
1958
1959 AllocExclusive();
1960
1961 M_IMGDATA->m_palette = palette;
1962 }
1963
1964 #endif // wxUSE_PALETTE
1965
1966 // ----------------------------------------------------------------------------
1967 // Option functions (arbitrary name/value mapping)
1968 // ----------------------------------------------------------------------------
1969
1970 void wxImage::SetOption(const wxString& name, const wxString& value)
1971 {
1972 wxCHECK_RET( Ok(), wxT("invalid image") );
1973
1974 AllocExclusive();
1975
1976 int idx = M_IMGDATA->m_optionNames.Index(name, false);
1977 if (idx == wxNOT_FOUND)
1978 {
1979 M_IMGDATA->m_optionNames.Add(name);
1980 M_IMGDATA->m_optionValues.Add(value);
1981 }
1982 else
1983 {
1984 M_IMGDATA->m_optionNames[idx] = name;
1985 M_IMGDATA->m_optionValues[idx] = value;
1986 }
1987 }
1988
1989 void wxImage::SetOption(const wxString& name, int value)
1990 {
1991 wxString valStr;
1992 valStr.Printf(wxT("%d"), value);
1993 SetOption(name, valStr);
1994 }
1995
1996 wxString wxImage::GetOption(const wxString& name) const
1997 {
1998 wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1999
2000 int idx = M_IMGDATA->m_optionNames.Index(name, false);
2001 if (idx == wxNOT_FOUND)
2002 return wxEmptyString;
2003 else
2004 return M_IMGDATA->m_optionValues[idx];
2005 }
2006
2007 int wxImage::GetOptionInt(const wxString& name) const
2008 {
2009 return wxAtoi(GetOption(name));
2010 }
2011
2012 bool wxImage::HasOption(const wxString& name) const
2013 {
2014 wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2015
2016 return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
2017 }
2018
2019 // ----------------------------------------------------------------------------
2020 // image I/O
2021 // ----------------------------------------------------------------------------
2022
2023 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2024 long WXUNUSED_UNLESS_STREAMS(type),
2025 int WXUNUSED_UNLESS_STREAMS(index) )
2026 {
2027 #if HAS_FILE_STREAMS
2028 if (wxFileExists(filename))
2029 {
2030 wxImageFileInputStream stream(filename);
2031 wxBufferedInputStream bstream( stream );
2032 return LoadFile(bstream, type, index);
2033 }
2034 else
2035 {
2036 wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2037
2038 return false;
2039 }
2040 #else // !HAS_FILE_STREAMS
2041 return false;
2042 #endif // HAS_FILE_STREAMS
2043 }
2044
2045 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2046 const wxString& WXUNUSED_UNLESS_STREAMS(mimetype),
2047 int WXUNUSED_UNLESS_STREAMS(index) )
2048 {
2049 #if HAS_FILE_STREAMS
2050 if (wxFileExists(filename))
2051 {
2052 wxImageFileInputStream stream(filename);
2053 wxBufferedInputStream bstream( stream );
2054 return LoadFile(bstream, mimetype, index);
2055 }
2056 else
2057 {
2058 wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2059
2060 return false;
2061 }
2062 #else // !HAS_FILE_STREAMS
2063 return false;
2064 #endif // HAS_FILE_STREAMS
2065 }
2066
2067
2068
2069 bool wxImage::SaveFile( const wxString& filename ) const
2070 {
2071 wxString ext = filename.AfterLast('.').Lower();
2072
2073 wxImageHandler * pHandler = FindHandler(ext, -1);
2074 if (pHandler)
2075 {
2076 return SaveFile(filename, pHandler->GetType());
2077 }
2078
2079 wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
2080
2081 return false;
2082 }
2083
2084 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2085 int WXUNUSED_UNLESS_STREAMS(type) ) const
2086 {
2087 #if HAS_FILE_STREAMS
2088 wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2089
2090 ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2091
2092 wxImageFileOutputStream stream(filename);
2093
2094 if ( stream.IsOk() )
2095 {
2096 wxBufferedOutputStream bstream( stream );
2097 return SaveFile(bstream, type);
2098 }
2099 #endif // HAS_FILE_STREAMS
2100
2101 return false;
2102 }
2103
2104 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2105 const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const
2106 {
2107 #if HAS_FILE_STREAMS
2108 wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2109
2110 ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2111
2112 wxImageFileOutputStream stream(filename);
2113
2114 if ( stream.IsOk() )
2115 {
2116 wxBufferedOutputStream bstream( stream );
2117 return SaveFile(bstream, mimetype);
2118 }
2119 #endif // HAS_FILE_STREAMS
2120
2121 return false;
2122 }
2123
2124 bool wxImage::CanRead( const wxString& WXUNUSED_UNLESS_STREAMS(name) )
2125 {
2126 #if HAS_FILE_STREAMS
2127 wxImageFileInputStream stream(name);
2128 return CanRead(stream);
2129 #else
2130 return false;
2131 #endif
2132 }
2133
2134 int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name),
2135 long WXUNUSED_UNLESS_STREAMS(type) )
2136 {
2137 #if HAS_FILE_STREAMS
2138 wxImageFileInputStream stream(name);
2139 if (stream.Ok())
2140 return GetImageCount(stream, type);
2141 #endif
2142
2143 return 0;
2144 }
2145
2146 #if wxUSE_STREAMS
2147
2148 bool wxImage::CanRead( wxInputStream &stream )
2149 {
2150 const wxList& list = GetHandlers();
2151
2152 for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
2153 {
2154 wxImageHandler *handler=(wxImageHandler*)node->GetData();
2155 if (handler->CanRead( stream ))
2156 return true;
2157 }
2158
2159 return false;
2160 }
2161
2162 int wxImage::GetImageCount( wxInputStream &stream, long type )
2163 {
2164 wxImageHandler *handler;
2165
2166 if ( type == wxBITMAP_TYPE_ANY )
2167 {
2168 wxList &list=GetHandlers();
2169
2170 for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
2171 {
2172 handler=(wxImageHandler*)node->GetData();
2173 if ( handler->CanRead(stream) )
2174 return handler->GetImageCount(stream);
2175
2176 }
2177
2178 wxLogWarning(_("No handler found for image type."));
2179 return 0;
2180 }
2181
2182 handler = FindHandler(type);
2183
2184 if ( !handler )
2185 {
2186 wxLogWarning(_("No image handler for type %ld defined."), type);
2187 return false;
2188 }
2189
2190 if ( handler->CanRead(stream) )
2191 {
2192 return handler->GetImageCount(stream);
2193 }
2194 else
2195 {
2196 wxLogError(_("Image file is not of type %ld."), type);
2197 return 0;
2198 }
2199 }
2200
2201 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
2202 {
2203 UnRef();
2204
2205 m_refData = new wxImageRefData;
2206
2207 wxImageHandler *handler;
2208
2209 if ( type == wxBITMAP_TYPE_ANY )
2210 {
2211 wxList &list=GetHandlers();
2212
2213 for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
2214 {
2215 handler=(wxImageHandler*)node->GetData();
2216 if ( handler->CanRead(stream) )
2217 return handler->LoadFile(this, stream, true/*verbose*/, index);
2218
2219 }
2220
2221 wxLogWarning( _("No handler found for image type.") );
2222 return false;
2223 }
2224
2225 handler = FindHandler(type);
2226
2227 if (handler == 0)
2228 {
2229 wxLogWarning( _("No image handler for type %ld defined."), type );
2230
2231 return false;
2232 }
2233
2234 if (stream.IsSeekable() && !handler->CanRead(stream))
2235 {
2236 wxLogError(_("Image file is not of type %ld."), type);
2237 return false;
2238 }
2239 else
2240 return handler->LoadFile(this, stream, true/*verbose*/, index);
2241 }
2242
2243 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
2244 {
2245 UnRef();
2246
2247 m_refData = new wxImageRefData;
2248
2249 wxImageHandler *handler = FindHandlerMime(mimetype);
2250
2251 if (handler == 0)
2252 {
2253 wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2254
2255 return false;
2256 }
2257
2258 if (stream.IsSeekable() && !handler->CanRead(stream))
2259 {
2260 wxLogError(_("Image file is not of type %s."), (const wxChar*) mimetype);
2261 return false;
2262 }
2263 else
2264 return handler->LoadFile( this, stream, true/*verbose*/, index );
2265 }
2266
2267 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
2268 {
2269 wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2270
2271 wxImageHandler *handler = FindHandler(type);
2272 if ( !handler )
2273 {
2274 wxLogWarning( _("No image handler for type %d defined."), type );
2275
2276 return false;
2277 }
2278
2279 return handler->SaveFile( (wxImage*)this, stream );
2280 }
2281
2282 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
2283 {
2284 wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2285
2286 wxImageHandler *handler = FindHandlerMime(mimetype);
2287 if ( !handler )
2288 {
2289 wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2290
2291 return false;
2292 }
2293
2294 return handler->SaveFile( (wxImage*)this, stream );
2295 }
2296 #endif // wxUSE_STREAMS
2297
2298 // ----------------------------------------------------------------------------
2299 // image I/O handlers
2300 // ----------------------------------------------------------------------------
2301
2302 void wxImage::AddHandler( wxImageHandler *handler )
2303 {
2304 // Check for an existing handler of the type being added.
2305 if (FindHandler( handler->GetType() ) == 0)
2306 {
2307 sm_handlers.Append( handler );
2308 }
2309 else
2310 {
2311 // This is not documented behaviour, merely the simplest 'fix'
2312 // for preventing duplicate additions. If someone ever has
2313 // a good reason to add and remove duplicate handlers (and they
2314 // may) we should probably refcount the duplicates.
2315 // also an issue in InsertHandler below.
2316
2317 wxLogDebug( _T("Adding duplicate image handler for '%s'"),
2318 handler->GetName().c_str() );
2319 delete handler;
2320 }
2321 }
2322
2323 void wxImage::InsertHandler( wxImageHandler *handler )
2324 {
2325 // Check for an existing handler of the type being added.
2326 if (FindHandler( handler->GetType() ) == 0)
2327 {
2328 sm_handlers.Insert( handler );
2329 }
2330 else
2331 {
2332 // see AddHandler for additional comments.
2333 wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
2334 handler->GetName().c_str() );
2335 delete handler;
2336 }
2337 }
2338
2339 bool wxImage::RemoveHandler( const wxString& name )
2340 {
2341 wxImageHandler *handler = FindHandler(name);
2342 if (handler)
2343 {
2344 sm_handlers.DeleteObject(handler);
2345 delete handler;
2346 return true;
2347 }
2348 else
2349 return false;
2350 }
2351
2352 wxImageHandler *wxImage::FindHandler( const wxString& name )
2353 {
2354 wxList::compatibility_iterator node = sm_handlers.GetFirst();
2355 while (node)
2356 {
2357 wxImageHandler *handler = (wxImageHandler*)node->GetData();
2358 if (handler->GetName().Cmp(name) == 0) return handler;
2359
2360 node = node->GetNext();
2361 }
2362 return 0;
2363 }
2364
2365 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
2366 {
2367 wxList::compatibility_iterator node = sm_handlers.GetFirst();
2368 while (node)
2369 {
2370 wxImageHandler *handler = (wxImageHandler*)node->GetData();
2371 if ( (handler->GetExtension().Cmp(extension) == 0) &&
2372 (bitmapType == -1 || handler->GetType() == bitmapType) )
2373 return handler;
2374 node = node->GetNext();
2375 }
2376 return 0;
2377 }
2378
2379 wxImageHandler *wxImage::FindHandler( long bitmapType )
2380 {
2381 wxList::compatibility_iterator node = sm_handlers.GetFirst();
2382 while (node)
2383 {
2384 wxImageHandler *handler = (wxImageHandler *)node->GetData();
2385 if (handler->GetType() == bitmapType) return handler;
2386 node = node->GetNext();
2387 }
2388 return 0;
2389 }
2390
2391 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
2392 {
2393 wxList::compatibility_iterator node = sm_handlers.GetFirst();
2394 while (node)
2395 {
2396 wxImageHandler *handler = (wxImageHandler *)node->GetData();
2397 if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
2398 node = node->GetNext();
2399 }
2400 return 0;
2401 }
2402
2403 void wxImage::InitStandardHandlers()
2404 {
2405 #if wxUSE_STREAMS
2406 AddHandler(new wxBMPHandler);
2407 #endif // wxUSE_STREAMS
2408 }
2409
2410 void wxImage::CleanUpHandlers()
2411 {
2412 wxList::compatibility_iterator node = sm_handlers.GetFirst();
2413 while (node)
2414 {
2415 wxImageHandler *handler = (wxImageHandler *)node->GetData();
2416 wxList::compatibility_iterator next = node->GetNext();
2417 delete handler;
2418 node = next;
2419 }
2420
2421 sm_handlers.Clear();
2422 }
2423
2424 wxString wxImage::GetImageExtWildcard()
2425 {
2426 wxString fmts;
2427
2428 wxList& Handlers = wxImage::GetHandlers();
2429 wxList::compatibility_iterator Node = Handlers.GetFirst();
2430 while ( Node )
2431 {
2432 wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
2433 fmts += wxT("*.") + Handler->GetExtension();
2434 Node = Node->GetNext();
2435 if ( Node ) fmts += wxT(";");
2436 }
2437
2438 return wxT("(") + fmts + wxT(")|") + fmts;
2439 }
2440
2441 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
2442 {
2443 const double red = rgb.red / 255.0,
2444 green = rgb.green / 255.0,
2445 blue = rgb.blue / 255.0;
2446
2447 // find the min and max intensity (and remember which one was it for the
2448 // latter)
2449 double minimumRGB = red;
2450 if ( green < minimumRGB )
2451 minimumRGB = green;
2452 if ( blue < minimumRGB )
2453 minimumRGB = blue;
2454
2455 enum { RED, GREEN, BLUE } chMax = RED;
2456 double maximumRGB = red;
2457 if ( green > maximumRGB )
2458 {
2459 chMax = GREEN;
2460 maximumRGB = green;
2461 }
2462 if ( blue > maximumRGB )
2463 {
2464 chMax = BLUE;
2465 maximumRGB = blue;
2466 }
2467
2468 const double value = maximumRGB;
2469
2470 double hue = 0.0, saturation;
2471 const double deltaRGB = maximumRGB - minimumRGB;
2472 if ( wxIsNullDouble(deltaRGB) )
2473 {
2474 // Gray has no color
2475 hue = 0.0;
2476 saturation = 0.0;
2477 }
2478 else
2479 {
2480 switch ( chMax )
2481 {
2482 case RED:
2483 hue = (green - blue) / deltaRGB;
2484 break;
2485
2486 case GREEN:
2487 hue = 2.0 + (blue - red) / deltaRGB;
2488 break;
2489
2490 case BLUE:
2491 hue = 4.0 + (red - green) / deltaRGB;
2492 break;
2493
2494 default:
2495 wxFAIL_MSG(wxT("hue not specified"));
2496 break;
2497 }
2498
2499 hue /= 6.0;
2500
2501 if ( hue < 0.0 )
2502 hue += 1.0;
2503
2504 saturation = deltaRGB / maximumRGB;
2505 }
2506
2507 return HSVValue(hue, saturation, value);
2508 }
2509
2510 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
2511 {
2512 double red, green, blue;
2513
2514 if ( wxIsNullDouble(hsv.saturation) )
2515 {
2516 // Grey
2517 red = hsv.value;
2518 green = hsv.value;
2519 blue = hsv.value;
2520 }
2521 else // not grey
2522 {
2523 double hue = hsv.hue * 6.0; // sector 0 to 5
2524 int i = (int)floor(hue);
2525 double f = hue - i; // fractional part of h
2526 double p = hsv.value * (1.0 - hsv.saturation);
2527
2528 switch (i)
2529 {
2530 case 0:
2531 red = hsv.value;
2532 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2533 blue = p;
2534 break;
2535
2536 case 1:
2537 red = hsv.value * (1.0 - hsv.saturation * f);
2538 green = hsv.value;
2539 blue = p;
2540 break;
2541
2542 case 2:
2543 red = p;
2544 green = hsv.value;
2545 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2546 break;
2547
2548 case 3:
2549 red = p;
2550 green = hsv.value * (1.0 - hsv.saturation * f);
2551 blue = hsv.value;
2552 break;
2553
2554 case 4:
2555 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2556 green = p;
2557 blue = hsv.value;
2558 break;
2559
2560 default: // case 5:
2561 red = hsv.value;
2562 green = p;
2563 blue = hsv.value * (1.0 - hsv.saturation * f);
2564 break;
2565 }
2566 }
2567
2568 return RGBValue((unsigned char)(red * 255.0),
2569 (unsigned char)(green * 255.0),
2570 (unsigned char)(blue * 255.0));
2571 }
2572
2573 /*
2574 * Rotates the hue of each pixel of the image. angle is a double in the range
2575 * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
2576 */
2577 void wxImage::RotateHue(double angle)
2578 {
2579 AllocExclusive();
2580
2581 unsigned char *srcBytePtr;
2582 unsigned char *dstBytePtr;
2583 unsigned long count;
2584 wxImage::HSVValue hsv;
2585 wxImage::RGBValue rgb;
2586
2587 wxASSERT (angle >= -1.0 && angle <= 1.0);
2588 count = M_IMGDATA->m_width * M_IMGDATA->m_height;
2589 if ( count > 0 && !wxIsNullDouble(angle) )
2590 {
2591 srcBytePtr = M_IMGDATA->m_data;
2592 dstBytePtr = srcBytePtr;
2593 do
2594 {
2595 rgb.red = *srcBytePtr++;
2596 rgb.green = *srcBytePtr++;
2597 rgb.blue = *srcBytePtr++;
2598 hsv = RGBtoHSV(rgb);
2599
2600 hsv.hue = hsv.hue + angle;
2601 if (hsv.hue > 1.0)
2602 hsv.hue = hsv.hue - 1.0;
2603 else if (hsv.hue < 0.0)
2604 hsv.hue = hsv.hue + 1.0;
2605
2606 rgb = HSVtoRGB(hsv);
2607 *dstBytePtr++ = rgb.red;
2608 *dstBytePtr++ = rgb.green;
2609 *dstBytePtr++ = rgb.blue;
2610 } while (--count != 0);
2611 }
2612 }
2613
2614 //-----------------------------------------------------------------------------
2615 // wxImageHandler
2616 //-----------------------------------------------------------------------------
2617
2618 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
2619
2620 #if wxUSE_STREAMS
2621 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
2622 {
2623 return false;
2624 }
2625
2626 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
2627 {
2628 return false;
2629 }
2630
2631 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
2632 {
2633 return 1;
2634 }
2635
2636 bool wxImageHandler::CanRead( const wxString& name )
2637 {
2638 if (wxFileExists(name))
2639 {
2640 wxImageFileInputStream stream(name);
2641 return CanRead(stream);
2642 }
2643
2644 wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
2645
2646 return false;
2647 }
2648
2649 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
2650 {
2651 wxFileOffset posOld = stream.TellI();
2652 if ( posOld == wxInvalidOffset )
2653 {
2654 // can't test unseekable stream
2655 return false;
2656 }
2657
2658 bool ok = DoCanRead(stream);
2659
2660 // restore the old position to be able to test other formats and so on
2661 if ( stream.SeekI(posOld) == wxInvalidOffset )
2662 {
2663 wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
2664
2665 // reading would fail anyhow as we're not at the right position
2666 return false;
2667 }
2668
2669 return ok;
2670 }
2671
2672 #endif // wxUSE_STREAMS
2673
2674 // ----------------------------------------------------------------------------
2675 // image histogram stuff
2676 // ----------------------------------------------------------------------------
2677
2678 bool
2679 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
2680 unsigned char *g,
2681 unsigned char *b,
2682 unsigned char r2,
2683 unsigned char b2,
2684 unsigned char g2) const
2685 {
2686 unsigned long key = MakeKey(r2, g2, b2);
2687
2688 while ( find(key) != end() )
2689 {
2690 // color already used
2691 r2++;
2692 if ( r2 >= 255 )
2693 {
2694 r2 = 0;
2695 g2++;
2696 if ( g2 >= 255 )
2697 {
2698 g2 = 0;
2699 b2++;
2700 if ( b2 >= 255 )
2701 {
2702 wxLogError(_("No unused colour in image.") );
2703 return false;
2704 }
2705 }
2706 }
2707
2708 key = MakeKey(r2, g2, b2);
2709 }
2710
2711 if ( r )
2712 *r = r2;
2713 if ( g )
2714 *g = g2;
2715 if ( b )
2716 *b = b2;
2717
2718 return true;
2719 }
2720
2721 bool
2722 wxImage::FindFirstUnusedColour(unsigned char *r,
2723 unsigned char *g,
2724 unsigned char *b,
2725 unsigned char r2,
2726 unsigned char b2,
2727 unsigned char g2) const
2728 {
2729 wxImageHistogram histogram;
2730
2731 ComputeHistogram(histogram);
2732
2733 return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2734 }
2735
2736
2737
2738 // GRG, Dic/99
2739 // Counts and returns the number of different colours. Optionally stops
2740 // when it exceeds 'stopafter' different colours. This is useful, for
2741 // example, to see if the image can be saved as 8-bit (256 colour or
2742 // less, in this case it would be invoked as CountColours(256)). Default
2743 // value for stopafter is -1 (don't care).
2744 //
2745 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2746 {
2747 wxHashTable h;
2748 wxObject dummy;
2749 unsigned char r, g, b;
2750 unsigned char *p;
2751 unsigned long size, nentries, key;
2752
2753 p = GetData();
2754 size = GetWidth() * GetHeight();
2755 nentries = 0;
2756
2757 for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2758 {
2759 r = *(p++);
2760 g = *(p++);
2761 b = *(p++);
2762 key = wxImageHistogram::MakeKey(r, g, b);
2763
2764 if (h.Get(key) == NULL)
2765 {
2766 h.Put(key, &dummy);
2767 nentries++;
2768 }
2769 }
2770
2771 return nentries;
2772 }
2773
2774
2775 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
2776 {
2777 unsigned char *p = GetData();
2778 unsigned long nentries = 0;
2779
2780 h.clear();
2781
2782 const unsigned long size = GetWidth() * GetHeight();
2783
2784 unsigned char r, g, b;
2785 for ( unsigned long n = 0; n < size; n++ )
2786 {
2787 r = *p++;
2788 g = *p++;
2789 b = *p++;
2790
2791 wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
2792
2793 if ( entry.value++ == 0 )
2794 entry.index = nentries++;
2795 }
2796
2797 return nentries;
2798 }
2799
2800 /*
2801 * Rotation code by Carlos Moreno
2802 */
2803
2804 static const double wxROTATE_EPSILON = 1e-10;
2805
2806 // Auxiliary function to rotate a point (x,y) with respect to point p0
2807 // make it inline and use a straight return to facilitate optimization
2808 // also, the function receives the sine and cosine of the angle to avoid
2809 // repeating the time-consuming calls to these functions -- sin/cos can
2810 // be computed and stored in the calling function.
2811
2812 static inline wxRealPoint
2813 wxRotatePoint(const wxRealPoint& p, double cos_angle, double sin_angle,
2814 const wxRealPoint& p0)
2815 {
2816 return wxRealPoint(p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
2817 p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
2818 }
2819
2820 static inline wxRealPoint
2821 wxRotatePoint(double x, double y, double cos_angle, double sin_angle,
2822 const wxRealPoint & p0)
2823 {
2824 return wxRotatePoint (wxRealPoint(x,y), cos_angle, sin_angle, p0);
2825 }
2826
2827 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
2828 {
2829 int i;
2830 angle = -angle; // screen coordinates are a mirror image of "real" coordinates
2831
2832 bool has_alpha = HasAlpha();
2833
2834 const int w = GetWidth(),
2835 h = GetHeight();
2836
2837 // Create pointer-based array to accelerate access to wxImage's data
2838 unsigned char ** data = new unsigned char * [h];
2839 data[0] = GetData();
2840 for (i = 1; i < h; i++)
2841 data[i] = data[i - 1] + (3 * w);
2842
2843 // Same for alpha channel
2844 unsigned char ** alpha = NULL;
2845 if (has_alpha)
2846 {
2847 alpha = new unsigned char * [h];
2848 alpha[0] = GetAlpha();
2849 for (i = 1; i < h; i++)
2850 alpha[i] = alpha[i - 1] + w;
2851 }
2852
2853 // precompute coefficients for rotation formula
2854 // (sine and cosine of the angle)
2855 const double cos_angle = cos(angle);
2856 const double sin_angle = sin(angle);
2857
2858 // Create new Image to store the result
2859 // First, find rectangle that covers the rotated image; to do that,
2860 // rotate the four corners
2861
2862 const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
2863
2864 wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0);
2865 wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0);
2866 wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0);
2867 wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0);
2868
2869 int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
2870 int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
2871 int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
2872 int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
2873
2874 // Create rotated image
2875 wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
2876 // With alpha channel
2877 if (has_alpha)
2878 rotated.SetAlpha();
2879
2880 if (offset_after_rotation != NULL)
2881 {
2882 *offset_after_rotation = wxPoint (x1a, y1a);
2883 }
2884
2885 // GRG: The rotated (destination) image is always accessed
2886 // sequentially, so there is no need for a pointer-based
2887 // array here (and in fact it would be slower).
2888 //
2889 unsigned char * dst = rotated.GetData();
2890
2891 unsigned char * alpha_dst = NULL;
2892 if (has_alpha)
2893 alpha_dst = rotated.GetAlpha();
2894
2895 // GRG: if the original image has a mask, use its RGB values
2896 // as the blank pixel, else, fall back to default (black).
2897 //
2898 unsigned char blank_r = 0;
2899 unsigned char blank_g = 0;
2900 unsigned char blank_b = 0;
2901
2902 if (HasMask())
2903 {
2904 blank_r = GetMaskRed();
2905 blank_g = GetMaskGreen();
2906 blank_b = GetMaskBlue();
2907 rotated.SetMaskColour( blank_r, blank_g, blank_b );
2908 }
2909
2910 // Now, for each point of the rotated image, find where it came from, by
2911 // performing an inverse rotation (a rotation of -angle) and getting the
2912 // pixel at those coordinates
2913
2914 const int rH = rotated.GetHeight();
2915 const int rW = rotated.GetWidth();
2916
2917 // GRG: I've taken the (interpolating) test out of the loops, so that
2918 // it is done only once, instead of repeating it for each pixel.
2919
2920 if (interpolating)
2921 {
2922 for (int y = 0; y < rH; y++)
2923 {
2924 for (int x = 0; x < rW; x++)
2925 {
2926 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2927
2928 if (-0.25 < src.x && src.x < w - 0.75 &&
2929 -0.25 < src.y && src.y < h - 0.75)
2930 {
2931 // interpolate using the 4 enclosing grid-points. Those
2932 // points can be obtained using floor and ceiling of the
2933 // exact coordinates of the point
2934 int x1, y1, x2, y2;
2935
2936 if (0 < src.x && src.x < w - 1)
2937 {
2938 x1 = wxRound(floor(src.x));
2939 x2 = wxRound(ceil(src.x));
2940 }
2941 else // else means that x is near one of the borders (0 or width-1)
2942 {
2943 x1 = x2 = wxRound (src.x);
2944 }
2945
2946 if (0 < src.y && src.y < h - 1)
2947 {
2948 y1 = wxRound(floor(src.y));
2949 y2 = wxRound(ceil(src.y));
2950 }
2951 else
2952 {
2953 y1 = y2 = wxRound (src.y);
2954 }
2955
2956 // get four points and the distances (square of the distance,
2957 // for efficiency reasons) for the interpolation formula
2958
2959 // GRG: Do not calculate the points until they are
2960 // really needed -- this way we can calculate
2961 // just one, instead of four, if d1, d2, d3
2962 // or d4 are < wxROTATE_EPSILON
2963
2964 const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2965 const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2966 const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2967 const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2968
2969 // Now interpolate as a weighted average of the four surrounding
2970 // points, where the weights are the distances to each of those points
2971
2972 // If the point is exactly at one point of the grid of the source
2973 // image, then don't interpolate -- just assign the pixel
2974
2975 // d1,d2,d3,d4 are positive -- no need for abs()
2976 if (d1 < wxROTATE_EPSILON)
2977 {
2978 unsigned char *p = data[y1] + (3 * x1);
2979 *(dst++) = *(p++);
2980 *(dst++) = *(p++);
2981 *(dst++) = *p;
2982
2983 if (has_alpha)
2984 *(alpha_dst++) = *(alpha[y1] + x1);
2985 }
2986 else if (d2 < wxROTATE_EPSILON)
2987 {
2988 unsigned char *p = data[y1] + (3 * x2);
2989 *(dst++) = *(p++);
2990 *(dst++) = *(p++);
2991 *(dst++) = *p;
2992
2993 if (has_alpha)
2994 *(alpha_dst++) = *(alpha[y1] + x2);
2995 }
2996 else if (d3 < wxROTATE_EPSILON)
2997 {
2998 unsigned char *p = data[y2] + (3 * x2);
2999 *(dst++) = *(p++);
3000 *(dst++) = *(p++);
3001 *(dst++) = *p;
3002
3003 if (has_alpha)
3004 *(alpha_dst++) = *(alpha[y2] + x2);
3005 }
3006 else if (d4 < wxROTATE_EPSILON)
3007 {
3008 unsigned char *p = data[y2] + (3 * x1);
3009 *(dst++) = *(p++);
3010 *(dst++) = *(p++);
3011 *(dst++) = *p;
3012
3013 if (has_alpha)
3014 *(alpha_dst++) = *(alpha[y2] + x1);
3015 }
3016 else
3017 {
3018 // weights for the weighted average are proportional to the inverse of the distance
3019 unsigned char *v1 = data[y1] + (3 * x1);
3020 unsigned char *v2 = data[y1] + (3 * x2);
3021 unsigned char *v3 = data[y2] + (3 * x2);
3022 unsigned char *v4 = data[y2] + (3 * x1);
3023
3024 const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
3025
3026 // GRG: Unrolled.
3027
3028 *(dst++) = (unsigned char)
3029 ( (w1 * *(v1++) + w2 * *(v2++) +
3030 w3 * *(v3++) + w4 * *(v4++)) /
3031 (w1 + w2 + w3 + w4) );
3032 *(dst++) = (unsigned char)
3033 ( (w1 * *(v1++) + w2 * *(v2++) +
3034 w3 * *(v3++) + w4 * *(v4++)) /
3035 (w1 + w2 + w3 + w4) );
3036 *(dst++) = (unsigned char)
3037 ( (w1 * *v1 + w2 * *v2 +
3038 w3 * *v3 + w4 * *v4) /
3039 (w1 + w2 + w3 + w4) );
3040
3041 if (has_alpha)
3042 {
3043 v1 = alpha[y1] + (x1);
3044 v2 = alpha[y1] + (x2);
3045 v3 = alpha[y2] + (x2);
3046 v4 = alpha[y2] + (x1);
3047
3048 *(alpha_dst++) = (unsigned char)
3049 ( (w1 * *v1 + w2 * *v2 +
3050 w3 * *v3 + w4 * *v4) /
3051 (w1 + w2 + w3 + w4) );
3052 }
3053 }
3054 }
3055 else
3056 {
3057 *(dst++) = blank_r;
3058 *(dst++) = blank_g;
3059 *(dst++) = blank_b;
3060
3061 if (has_alpha)
3062 *(alpha_dst++) = 0;
3063 }
3064 }
3065 }
3066 }
3067 else // not interpolating
3068 {
3069 for (int y = 0; y < rH; y++)
3070 {
3071 for (int x = 0; x < rW; x++)
3072 {
3073 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
3074
3075 const int xs = wxRound (src.x); // wxRound rounds to the
3076 const int ys = wxRound (src.y); // closest integer
3077
3078 if (0 <= xs && xs < w && 0 <= ys && ys < h)
3079 {
3080 unsigned char *p = data[ys] + (3 * xs);
3081 *(dst++) = *(p++);
3082 *(dst++) = *(p++);
3083 *(dst++) = *p;
3084
3085 if (has_alpha)
3086 *(alpha_dst++) = *(alpha[ys] + (xs));
3087 }
3088 else
3089 {
3090 *(dst++) = blank_r;
3091 *(dst++) = blank_g;
3092 *(dst++) = blank_b;
3093
3094 if (has_alpha)
3095 *(alpha_dst++) = 255;
3096 }
3097 }
3098 }
3099 }
3100
3101 delete [] data;
3102
3103 if (has_alpha)
3104 delete [] alpha;
3105
3106 return rotated;
3107 }
3108
3109
3110
3111
3112
3113 // A module to allow wxImage initialization/cleanup
3114 // without calling these functions from app.cpp or from
3115 // the user's application.
3116
3117 class wxImageModule: public wxModule
3118 {
3119 DECLARE_DYNAMIC_CLASS(wxImageModule)
3120 public:
3121 wxImageModule() {}
3122 bool OnInit() { wxImage::InitStandardHandlers(); return true; }
3123 void OnExit() { wxImage::CleanUpHandlers(); }
3124 };
3125
3126 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
3127
3128
3129 #endif // wxUSE_IMAGE

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