src/cocoa/bitmap.mm

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/cocoa/bitmap.mm
   3 // Purpose:     wxBitmap
   4 // Author:      David Elliott
   5 // Modified by:
   6 // Created:     2003/07/19
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 David Elliott
   9 // Licence:     wxWidgets licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #include "wx/bitmap.h"
  15
  16 #ifndef WX_PRECOMP
  17     #include "wx/log.h"
  18     #include "wx/utils.h"
  19     #include "wx/palette.h"
  20     #include "wx/icon.h"
  21     #include "wx/colour.h"
  22 #endif //WX_PRECOMP
  23
  24 #include "wx/image.h"
  25 #include "wx/xpmdecod.h"
  26 #include "wx/rawbmp.h"
  27
  28 #include "wx/cocoa/autorelease.h"
  29 #include "wx/cocoa/string.h"
  30
  31 #import <AppKit/NSBitmapImageRep.h>
  32 #import <AppKit/NSGraphics.h>
  33 #import <AppKit/NSImage.h>
  34 #import <AppKit/NSColor.h>
  35
  36 // ========================================================================
  37 // wxBitmapRefData
  38 // ========================================================================
  39 class wxBitmapRefData: public wxGDIRefData
  40 {
  41     friend class wxBitmap;
  42 public:
  43     wxBitmapRefData();
  44     wxBitmapRefData( const wxBitmapRefData& data );
  45     virtual ~wxBitmapRefData();
  46
  47 protected:
  48     int                 m_width;
  49     int                 m_height;
  50     int                 m_depth;
  51     bool                m_ok;
  52     int                 m_numColors;
  53     wxPalette           m_bitmapPalette;
  54     int                 m_quality;
  55     WX_NSBitmapImageRep m_cocoaNSBitmapImageRep;
  56     wxMask             *m_bitmapMask; // Optional mask
  57 };
  58
  59 #define M_BITMAPDATA ((wxBitmapRefData *)m_refData)
  60
  61 wxBitmapRefData::wxBitmapRefData()
  62 {
  63     m_ok = FALSE;
  64     m_width = 0;
  65     m_height = 0;
  66     m_depth = 0;
  67     m_quality = 0;
  68     m_numColors = 0;
  69     m_cocoaNSBitmapImageRep = nil;
  70     m_bitmapMask = NULL;
  71 }
  72
  73 wxBitmapRefData::wxBitmapRefData( const wxBitmapRefData& data)
  74 {
  75     m_width = data.m_width;
  76     m_height = data.m_height;
  77     m_depth = data.m_depth;
  78     m_ok = data.m_ok;
  79     m_numColors = data.m_numColors;
  80     m_bitmapPalette = data.m_bitmapPalette;
  81     m_quality = data.m_quality;
  82     m_cocoaNSBitmapImageRep = [data.m_cocoaNSBitmapImageRep copyWithZone:nil];
  83     m_bitmapMask = data.m_bitmapMask?new wxMask(*data.m_bitmapMask):NULL;
  84 }
  85
  86 wxBitmapRefData::~wxBitmapRefData()
  87 {
  88     [m_cocoaNSBitmapImageRep release];
  89     m_cocoaNSBitmapImageRep = NULL;
  90
  91     delete m_bitmapMask;
  92     m_bitmapMask = NULL;
  93 }
  94
  95 // ========================================================================
  96 // wxBitmap
  97 // ========================================================================
  98 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
  99
 100 wxBitmap::wxBitmap()
 101 {
 102     m_refData = NULL;
 103 }
 104
 105 wxBitmap::~wxBitmap()
 106 {
 107 }
 108
 109 wxBitmap::wxBitmap(const char bits[], int the_width, int the_height, int no_bits)
 110 {
 111     m_refData = new wxBitmapRefData;
 112
 113     M_BITMAPDATA->m_width = the_width ;
 114     M_BITMAPDATA->m_height = the_height ;
 115     M_BITMAPDATA->m_depth = no_bits ;
 116     M_BITMAPDATA->m_numColors = 0;
 117
 118     /* TODO: create the bitmap from data */
 119 }
 120
 121 wxBitmap::wxBitmap(int w, int h, int d)
 122 {
 123     (void)Create(w, h, d);
 124 }
 125
 126 wxBitmap::wxBitmap(void *data, wxBitmapType type, int width, int height, int depth)
 127 {
 128     (void) Create(data, type, width, height, depth);
 129 }
 130
 131 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
 132 {
 133     LoadFile(filename, type);
 134 }
 135
 136 wxObjectRefData *wxBitmap::CreateRefData() const
 137 {
 138     return new wxBitmapRefData;
 139 }
 140
 141 wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *data) const
 142 {
 143     return new wxBitmapRefData(*(wxBitmapRefData*)data);
 144 }
 145
 146 WX_NSBitmapImageRep wxBitmap::GetNSBitmapImageRep()
 147 {
 148     if(!M_BITMAPDATA)
 149         return NULL;
 150     return M_BITMAPDATA->m_cocoaNSBitmapImageRep;
 151 }
 152
 153 WX_NSImage wxBitmap::GetNSImage(bool useMask) const
 154 {
 155     if(!Ok())
 156         return nil;
 157     NSImage *nsimage = [[[NSImage alloc]
 158             initWithSize:NSMakeSize(GetWidth(), GetHeight())] autorelease];
 159     if(!nsimage)
 160         return nil;
 161     [nsimage addRepresentation: M_BITMAPDATA->m_cocoaNSBitmapImageRep];
 162     if(useMask && GetMask())
 163     {
 164         // Show before/after to prove that the bitmap itself is not changed
 165         // even though we just composited onto the NSImage
 166         wxLogTrace(wxTRACE_COCOA,wxT("Before: bpp=%d"),[M_BITMAPDATA->m_cocoaNSBitmapImageRep bitsPerPixel]);
 167         NSImage *maskImage = [[NSImage alloc]
 168                 initWithSize:NSMakeSize(GetWidth(), GetHeight())];
 169         [maskImage addRepresentation: GetMask()->GetNSBitmapImageRep()];
 170         [nsimage lockFocus];
 171         [maskImage compositeToPoint:NSZeroPoint operation:NSCompositeDestinationIn];
 172         [nsimage unlockFocus];
 173         [maskImage release];
 174         wxLogTrace(wxTRACE_COCOA,wxT("After: bpp=%d"),[M_BITMAPDATA->m_cocoaNSBitmapImageRep bitsPerPixel]);
 175     }
 176     return nsimage;
 177 }
 178
 179 void wxBitmap::SetNSBitmapImageRep(WX_NSBitmapImageRep bitmapImageRep)
 180 {
 181     if(!M_BITMAPDATA)
 182         return;
 183     // NOTE: No checking is done to make sure width/height agree
 184     [bitmapImageRep retain];
 185     [M_BITMAPDATA->m_cocoaNSBitmapImageRep release];
 186     M_BITMAPDATA->m_cocoaNSBitmapImageRep = bitmapImageRep;
 187 }
 188
 189 void wxBitmap::SetWidth(int w)
 190 {
 191     if (!M_BITMAPDATA)
 192         m_refData = new wxBitmapRefData;
 193
 194     M_BITMAPDATA->m_width = w;
 195 }
 196
 197 void wxBitmap::SetHeight(int h)
 198 {
 199     if (!M_BITMAPDATA)
 200         m_refData = new wxBitmapRefData;
 201
 202     M_BITMAPDATA->m_height = h;
 203 }
 204
 205 void wxBitmap::SetDepth(int d)
 206 {
 207     if (!M_BITMAPDATA)
 208         m_refData = new wxBitmapRefData;
 209
 210     M_BITMAPDATA->m_depth = d;
 211 }
 212
 213 void wxBitmap::SetQuality(int q)
 214 {
 215     if (!M_BITMAPDATA)
 216         m_refData = new wxBitmapRefData;
 217
 218     M_BITMAPDATA->m_quality = q;
 219 }
 220
 221 void wxBitmap::SetOk(bool isOk)
 222 {
 223     if (!M_BITMAPDATA)
 224         m_refData = new wxBitmapRefData;
 225
 226     M_BITMAPDATA->m_ok = isOk;
 227 }
 228
 229 void wxBitmap::SetPalette(const wxPalette& palette)
 230 {
 231     if (!M_BITMAPDATA)
 232         m_refData = new wxBitmapRefData;
 233
 234     M_BITMAPDATA->m_bitmapPalette = palette ;
 235 }
 236
 237 void wxBitmap::SetMask(wxMask *mask)
 238 {
 239     if (!M_BITMAPDATA)
 240         m_refData = new wxBitmapRefData;
 241
 242     M_BITMAPDATA->m_bitmapMask = mask ;
 243 }
 244
 245 bool wxBitmap::Ok() const
 246 {
 247     return m_refData && M_BITMAPDATA->m_ok;
 248 }
 249
 250 wxPalette* wxBitmap::GetPalette() const
 251 {
 252     if(!m_refData)
 253         return NULL;
 254     return &M_BITMAPDATA->m_bitmapPalette;
 255 }
 256
 257 wxMask* wxBitmap::GetMask() const
 258 {
 259     if(!m_refData)
 260         return NULL;
 261     return M_BITMAPDATA->m_bitmapMask;
 262 }
 263
 264 int wxBitmap::GetDepth() const
 265 {
 266     if(!m_refData)
 267         return 0;
 268     return M_BITMAPDATA->m_depth;
 269 }
 270
 271 int wxBitmap::GetWidth() const
 272 {
 273     if(!m_refData)
 274         return 0;
 275     return M_BITMAPDATA->m_width;
 276 }
 277
 278 int wxBitmap::GetHeight() const
 279 {
 280     if(!m_refData)
 281         return 0;
 282     return M_BITMAPDATA->m_height;
 283 }
 284
 285 bool wxBitmap::Create(int w, int h, int d)
 286 {
 287     UnRef();
 288
 289     m_refData = new wxBitmapRefData;
 290
 291     M_BITMAPDATA->m_width = w;
 292     M_BITMAPDATA->m_height = h;
 293     M_BITMAPDATA->m_depth = d;
 294
 295     /* TODO: create new bitmap */
 296     M_BITMAPDATA->m_cocoaNSBitmapImageRep = [[NSBitmapImageRep alloc]
 297             initWithBitmapDataPlanes: NULL
 298             pixelsWide: w
 299             pixelsHigh: h
 300             bitsPerSample: 8
 301             samplesPerPixel: 3
 302             hasAlpha: NO
 303             isPlanar: NO
 304             colorSpaceName: NSCalibratedRGBColorSpace
 305             bytesPerRow: 0  // NOTE: Contrary to Apple documentation Mac OS
 306                             // 10.4 will add padding bytes when 0 is used here
 307             bitsPerPixel: 0];
 308
 309     wxLogTrace(wxTRACE_COCOA,wxT("M_BITMAPDATA=%p NSBitmapImageRep bitmapData=%p"), M_BITMAPDATA, [M_BITMAPDATA->m_cocoaNSBitmapImageRep bitmapData]);
 310     M_BITMAPDATA->m_ok = true;
 311     M_BITMAPDATA->m_numColors = 0;
 312     M_BITMAPDATA->m_quality = 0;
 313     M_BITMAPDATA->m_bitmapMask = NULL;
 314
 315     return M_BITMAPDATA->m_ok;
 316 }
 317
 318 bool wxBitmap::LoadFile(const wxString& filename, wxBitmapType type)
 319 {
 320     wxAutoNSAutoreleasePool pool;
 321     UnRef();
 322
 323     m_refData = new wxBitmapRefData;
 324
 325     NSBitmapImageRep *imageRep = [NSBitmapImageRep
 326         imageRepWithContentsOfFile:wxNSStringWithWxString(filename)];
 327
 328     if(imageRep)
 329     {
 330         M_BITMAPDATA->m_width = [imageRep pixelsWide];
 331         M_BITMAPDATA->m_height = [imageRep pixelsHigh];
 332         M_BITMAPDATA->m_depth = 24; // FIXME
 333         M_BITMAPDATA->m_ok = true;
 334         M_BITMAPDATA->m_numColors = 0;
 335         M_BITMAPDATA->m_quality = 0;
 336         M_BITMAPDATA->m_cocoaNSBitmapImageRep = [imageRep retain];
 337         M_BITMAPDATA->m_bitmapMask = NULL;
 338         return true;
 339     }
 340     wxImage image;
 341     if(!image.LoadFile(filename,type))
 342         return false;
 343     if(!image.Ok())
 344         return false;
 345     *this = wxBitmap(image);
 346     return true;
 347 }
 348
 349 bool wxBitmap::Create(void *data, wxBitmapType type, int width, int height, int depth)
 350 {
 351     UnRef();
 352
 353     m_refData = new wxBitmapRefData;
 354
 355     return false;
 356 }
 357
 358 bool wxBitmap::SaveFile(const wxString& filename, wxBitmapType type, const wxPalette *palette) const
 359 {
 360     return false;
 361 }
 362
 363 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
 364 {
 365     UnRef();
 366     if(!icon.GetNSImage());
 367     [icon.GetNSImage() lockFocus];
 368     NSRect imageRect;
 369     imageRect.origin.x = imageRect.origin.y = 0.0;
 370     imageRect.size = [icon.GetNSImage() size];
 371     NSBitmapImageRep *newBitmapRep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:imageRect];
 372     [icon.GetNSImage() unlockFocus];
 373     if(!newBitmapRep)
 374         return false;
 375     m_refData = new wxBitmapRefData;
 376     M_BITMAPDATA->m_cocoaNSBitmapImageRep = newBitmapRep;
 377     M_BITMAPDATA->m_width = [newBitmapRep pixelsWide];
 378     M_BITMAPDATA->m_height = [newBitmapRep pixelsHigh];
 379     M_BITMAPDATA->m_depth = [newBitmapRep bitsPerSample]*[newBitmapRep samplesPerPixel];
 380     M_BITMAPDATA->m_ok = true;
 381     M_BITMAPDATA->m_numColors = 0;
 382     M_BITMAPDATA->m_quality = 0;
 383     M_BITMAPDATA->m_bitmapMask = NULL;
 384     return true;
 385 }
 386
 387 wxBitmap wxBitmap::GetSubBitmap(wxRect const&) const
 388 {
 389     return wxNullBitmap;
 390 }
 391
 392 wxImage wxBitmap::ConvertToImage() const
 393 {
 394     wxAutoNSAutoreleasePool pool;
 395     if(!Ok())
 396         return /*wxImage(5,5)*/wxNullImage;
 397     NSImage *nsimage = GetNSImage(false /* don't use mask */);
 398     wxImage newImage(M_BITMAPDATA->m_width,M_BITMAPDATA->m_height);
 399     [nsimage lockFocus];
 400     for(int i=0; i < M_BITMAPDATA->m_width; i++)
 401     {
 402         // Don't let the pool get too big as you'll notice we're creating
 403         // two autoreleased NSColor objects with every iteration.
 404         wxAutoNSAutoreleasePool loopPool;
 405         for(int j=0; j < M_BITMAPDATA->m_height; j++)
 406         {
 407             NSColor *pixelColor = NSReadPixel(NSMakePoint(i,M_BITMAPDATA->m_height - j - 1));
 408             NSColor *color = [pixelColor colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
 409             newImage.SetRGB(i,j,int([color redComponent]*255.0), int([color greenComponent]*255.0), int([color blueComponent]*255.0));
 410         }
 411     }
 412     [nsimage unlockFocus];
 413     return newImage;
 414 }
 415
 416 bool wxBitmap::CreateFromXpm(const char **xpm)
 417 {
 418 #if wxUSE_IMAGE && wxUSE_XPM
 419     UnRef();
 420
 421     wxCHECK_MSG( xpm, false, wxT("invalid XPM data") );
 422
 423     wxXPMDecoder decoder;
 424     wxImage img = decoder.ReadData(xpm);
 425     wxCHECK_MSG( img.Ok(), false, wxT("invalid XPM data") );
 426
 427     *this = wxBitmap(img);
 428     return true;
 429 #else
 430     return false;
 431 #endif
 432 }
 433
 434 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
 435 {
 436     UnRef();
 437
 438     wxCHECK_MSG(image.Ok(), false, wxT("invalid image"));
 439     wxCHECK_MSG(depth == -1 || depth == 1, false, wxT("invalid bitmap depth"));
 440
 441     m_refData = new wxBitmapRefData();
 442
 443     M_BITMAPDATA->m_width = image.GetWidth();
 444     M_BITMAPDATA->m_height = image.GetHeight();
 445     NSBitmapImageRep *bitmapImage = [[NSBitmapImageRep alloc]
 446             initWithBitmapDataPlanes: NULL
 447             pixelsWide: image.GetWidth()
 448             pixelsHigh: image.GetHeight()
 449             bitsPerSample: 8
 450             samplesPerPixel: 3
 451             hasAlpha: NO
 452             isPlanar: NO
 453             colorSpaceName: NSCalibratedRGBColorSpace
 454             bytesPerRow: image.GetWidth()*3
 455             bitsPerPixel: 0];
 456
 457     // TODO: Specify bytesPerRow:0 and then use [bitmapImage bytesPerRow]
 458     // so that the rows are aligned suitably for altivec by the OS (Tiger)
 459     const int numBytes = image.GetWidth()*image.GetHeight()*3;
 460     memcpy([bitmapImage bitmapData], image.GetData(), numBytes);
 461     // TODO: Alpha and convert to desired depth
 462     M_BITMAPDATA->m_depth = 24;
 463     M_BITMAPDATA->m_ok = true;
 464     M_BITMAPDATA->m_numColors = 0;
 465     M_BITMAPDATA->m_quality = 0;
 466     M_BITMAPDATA->m_cocoaNSBitmapImageRep = bitmapImage;
 467     M_BITMAPDATA->m_bitmapMask = new wxMask(*this,wxColour(image.GetMaskRed(),image.GetMaskGreen(),image.GetMaskBlue()));
 468     return true;
 469 }
 470
 471 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
 472 {
 473     if(!Ok())
 474         return NULL;
 475
 476     NSBitmapImageRep *bitmapRep = M_BITMAPDATA->m_cocoaNSBitmapImageRep;
 477     if(!bitmapRep)
 478         return NULL;
 479
 480     if([bitmapRep bitsPerPixel]!=bpp)
 481     {
 482         wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
 483         return NULL;
 484     }
 485     data.m_width = [bitmapRep pixelsWide];
 486     data.m_height = [bitmapRep pixelsHigh];
 487     data.m_stride = [bitmapRep bytesPerRow];
 488     return [bitmapRep bitmapData];
 489
 490     // NOTE: It is up to the user to make sure they used the proper
 491     // pixel format class that details what is actually inside the pixels
 492     // We can only check to make sure that the total number of bits per
 493     // pixel are being iterated over properly
 494     // NSBitmapImageRep can contain grayscale or CMYK data and
 495     // wxPixelDataBase doesn't really define the color format
 496 }
 497
 498 void wxBitmap::UngetRawData(wxPixelDataBase& data)
 499 {   // TODO
 500 }
 501
 502 void wxBitmap::UseAlpha()
 503 {   // TODO
 504 }
 505
 506 // ========================================================================
 507 // wxMask
 508 // ========================================================================
 509
 510 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
 511
 512 wxMask::wxMask()
 513 {
 514     m_cocoaNSBitmapImageRep = nil;
 515 }
 516
 517 // Construct a mask from a bitmap and a colour indicating
 518 // the transparent area
 519 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
 520 {
 521     m_cocoaNSBitmapImageRep = nil;
 522     Create(bitmap, colour);
 523 }
 524
 525 // Construct a mask from a bitmap and a palette index indicating
 526 // the transparent area
 527 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
 528 {
 529     m_cocoaNSBitmapImageRep = nil;
 530
 531     Create(bitmap, paletteIndex);
 532 }
 533
 534 // Construct a mask from a mono bitmap (copies the bitmap).
 535 wxMask::wxMask(const wxBitmap& bitmap)
 536 {
 537     m_cocoaNSBitmapImageRep = nil;
 538
 539     Create(bitmap);
 540 }
 541
 542 wxMask::~wxMask()
 543 {
 544     [m_cocoaNSBitmapImageRep release];
 545 }
 546
 547 // Create a mask from a mono bitmap (copies the bitmap).
 548 bool wxMask::Create(const wxBitmap& bitmap)
 549 {
 550 // TODO
 551     return FALSE;
 552 }
 553
 554 // Create a mask from a bitmap and a palette index indicating
 555 // the transparent area
 556 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
 557 {
 558 // TODO
 559     return FALSE;
 560 }
 561
 562 template <typename PixelData>
 563 static bool wxMask_CreateFromBitmapData(PixelData srcData, const wxColour& colour, unsigned char *dstData)
 564 {
 565     wxCHECK_MSG(dstData,false,wxT("Couldn't access mask data"));
 566     typename PixelData::Iterator p(srcData);
 567     const int nRows = srcData.GetHeight();
 568     const int nCols = srcData.GetWidth();
 569     // Total number of bytes per destination column
 570     const int dstRowLength = (nCols+7)/8;
 571     // Number of source columns that fit into a byte in the destination
 572     const int width_aligned = nCols/8*8;
 573     for(int y=0; y<nRows; ++y)
 574     {
 575         typename PixelData::Iterator rowStart(p);
 576         unsigned char *dstRow = dstData + y*dstRowLength;
 577         for(int x=0; x<width_aligned; x+=8)
 578         {
 579             unsigned char *dstByte = dstRow + x/8;
 580             *dstByte = 0;
 581             // Take source RGB, compare it with the wxColour
 582             for(int j=0; j<8; ++j, ++p)
 583             {
 584                 *dstByte +=
 585                 (   p.Red()!=colour.Red()
 586                 ||  p.Green()!=colour.Green()
 587                 ||  p.Blue()!=colour.Blue()
 588                 )   << (7-j);
 589             }
 590         }
 591         // Handle the remaining 0-7 pixels in the row
 592         unsigned char *dstByte = dstRow + width_aligned/8;
 593         if(nCols%8>0)
 594             *dstByte = 0;
 595         for(int j=0; j<(nCols%8); ++j, ++p)
 596         {
 597             *dstByte +=
 598             (   p.Red()!=colour.Red()
 599             ||  p.Green()!=colour.Green()
 600             ||  p.Blue()!=colour.Blue()
 601             )   << (7-j);
 602         }
 603         p = rowStart;
 604         p.OffsetY(srcData,1);
 605     }
 606     return true;
 607 }
 608
 609 // Create a mask from a bitmap and a colour indicating
 610 // the transparent area
 611 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
 612 {
 613     wxAutoNSAutoreleasePool pool;
 614     if(!bitmap.Ok())
 615         return false;
 616     int bmpWidth = bitmap.GetWidth();
 617     int bmpHeight = bitmap.GetHeight();
 618     int dstRowLength = (bmpWidth+7)/8;
 619
 620     // Create a bitmap image rep with 1-bit per pixel data representing
 621     // the alpha channel padded such that rows end on byte boundaries
 622     // Since NSBitmapImageRep doesn't have any sort of NSNullColorSpace
 623     // we must have at least one channel of non-alpha data.  In order to
 624     // make our life easy, we use planar data which results in two
 625     // separate arrays.  We don't need to touch the first because it
 626     // should never be used.  The second is the 1-bit "alpha" data.
 627     NSBitmapImageRep *maskRep = [[[NSBitmapImageRep alloc]
 628         initWithBitmapDataPlanes:NULL pixelsWide:bmpWidth
 629         pixelsHigh:bmpHeight bitsPerSample:1
 630         samplesPerPixel:2 hasAlpha:YES isPlanar:YES
 631         colorSpaceName:NSCalibratedWhiteColorSpace
 632         bytesPerRow:dstRowLength bitsPerPixel:1] autorelease];
 633     wxCHECK(maskRep,false);
 634
 635     // We need the source NSBitmapImageRep to detemine its pixel format
 636     NSBitmapImageRep *srcBitmapRep = const_cast<wxBitmap&>(bitmap).GetNSBitmapImageRep();
 637     wxCHECK_MSG(srcBitmapRep,false,wxT("Can't create mask for an uninitialized bitmap"));
 638
 639     // Get a pointer to the destination data
 640     unsigned char *dstPlanes[5] = {NULL,NULL,NULL,NULL,NULL};
 641     [maskRep getBitmapDataPlanes:dstPlanes];
 642     unsigned char *dstData = dstPlanes[1];
 643     // The wxImage format (which we use whenever we imported from wxImage)
 644     if([srcBitmapRep bitsPerPixel]==24 && [srcBitmapRep bitsPerSample]==8 && [srcBitmapRep samplesPerPixel]==3 && [srcBitmapRep hasAlpha]==NO)
 645     {
 646         wxPixelData<wxBitmap,wxNativePixelFormat> pixelData(const_cast<wxBitmap&>(bitmap));
 647         wxCHECK_MSG(wxMask_CreateFromBitmapData(pixelData, colour, dstData),
 648             false, wxT("Unable to access raw data"));
 649     }
 650     // 32-bpp RGBx (x=throw away, no alpha)
 651     else if([srcBitmapRep bitsPerPixel]==32 && [srcBitmapRep bitsPerSample]==8 && [srcBitmapRep samplesPerPixel]==3 && [srcBitmapRep hasAlpha]==NO)
 652     {
 653         typedef wxPixelFormat<unsigned char,32,0,1,2> PixelFormat;
 654         wxPixelData<wxBitmap,PixelFormat> pixelData(const_cast<wxBitmap&>(bitmap));
 655         wxCHECK_MSG(wxMask_CreateFromBitmapData(pixelData, colour, dstData),
 656             false, wxT("Unable to access raw data"));
 657     }
 658     // 32-bpp RGBA
 659     else if([srcBitmapRep bitsPerPixel]==32 && [srcBitmapRep bitsPerSample]==8 && [srcBitmapRep samplesPerPixel]==4 && [srcBitmapRep hasAlpha]==YES)
 660     {
 661         wxPixelData<wxBitmap,wxAlphaPixelFormat> pixelData(const_cast<wxBitmap&>(bitmap));
 662         wxCHECK_MSG(wxMask_CreateFromBitmapData(pixelData, colour, dstData),
 663             false, wxT("Unable to access raw data"));
 664     }
 665     else
 666     {   wxCHECK_MSG(false,false,wxT("Unimplemented pixel format")); }
 667
 668     // maskRep was autoreleased in case we had to exit quickly
 669     m_cocoaNSBitmapImageRep = [maskRep retain];
 670     return true;
 671 }