src/gtk/bitmap.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/bitmap.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #include "wx/bitmap.h"
  14
  15 #ifndef WX_PRECOMP
  16     #include "wx/app.h"
  17     #include "wx/palette.h"
  18     #include "wx/icon.h"
  19     #include "wx/math.h"
  20     #include "wx/image.h"
  21     #include "wx/colour.h"
  22 #endif
  23
  24 #include "wx/rawbmp.h"
  25
  26 #include <gtk/gtk.h>
  27
  28 //-----------------------------------------------------------------------------
  29 // data
  30 //-----------------------------------------------------------------------------
  31
  32 extern GtkWidget *wxGetRootWindow();
  33
  34 //-----------------------------------------------------------------------------
  35 // wxMask
  36 //-----------------------------------------------------------------------------
  37
  38 IMPLEMENT_DYNAMIC_CLASS(wxMask,wxObject)
  39
  40 wxMask::wxMask()
  41 {
  42     m_bitmap = (GdkBitmap *) NULL;
  43 }
  44
  45 wxMask::wxMask( const wxBitmap& bitmap, const wxColour& colour )
  46 {
  47     m_bitmap = (GdkBitmap *) NULL;
  48     Create( bitmap, colour );
  49 }
  50
  51 #if wxUSE_PALETTE
  52 wxMask::wxMask( const wxBitmap& bitmap, int paletteIndex )
  53 {
  54     m_bitmap = (GdkBitmap *) NULL;
  55     Create( bitmap, paletteIndex );
  56 }
  57 #endif // wxUSE_PALETTE
  58
  59 wxMask::wxMask( const wxBitmap& bitmap )
  60 {
  61     m_bitmap = (GdkBitmap *) NULL;
  62     Create( bitmap );
  63 }
  64
  65 wxMask::~wxMask()
  66 {
  67     if (m_bitmap)
  68         g_object_unref (m_bitmap);
  69 }
  70
  71 bool wxMask::Create( const wxBitmap& bitmap,
  72                      const wxColour& colour )
  73 {
  74     if (m_bitmap)
  75     {
  76         g_object_unref (m_bitmap);
  77         m_bitmap = (GdkBitmap*) NULL;
  78     }
  79
  80     const int w = bitmap.GetWidth();
  81     const int h = bitmap.GetHeight();
  82
  83     // create mask as XBM format bitmap
  84
  85     // one bit per pixel, each row starts on a byte boundary
  86     const size_t out_size = size_t((w + 7) / 8) * unsigned(h);
  87     wxByte* out = new wxByte[out_size];
  88     // set bits are unmasked
  89     memset(out, 0xff, out_size);
  90     unsigned bit_index = 0;
  91     if (bitmap.HasPixbuf())
  92     {
  93         const wxByte r_mask = colour.Red();
  94         const wxByte g_mask = colour.Green();
  95         const wxByte b_mask = colour.Blue();
  96         GdkPixbuf* pixbuf = bitmap.GetPixbuf();
  97         const wxByte* in = gdk_pixbuf_get_pixels(pixbuf);
  98         const int inc = 3 + int(gdk_pixbuf_get_has_alpha(pixbuf) != 0);
  99         const int rowpadding = gdk_pixbuf_get_rowstride(pixbuf) - inc * w;
 100         for (int y = 0; y < h; y++, in += rowpadding)
 101         {
 102             for (int x = 0; x < w; x++, in += inc, bit_index++)
 103                 if (in[0] == r_mask && in[1] == g_mask && in[2] == b_mask)
 104                     out[bit_index >> 3] ^= 1 << (bit_index & 7);
 105             // move index to next byte boundary
 106             bit_index = (bit_index + 7) & ~7u;
 107         }
 108     }
 109     else
 110     {
 111         GdkImage* image = gdk_drawable_get_image(bitmap.GetPixmap(), 0, 0, w, h);
 112         GdkColormap* colormap = gdk_image_get_colormap(image);
 113         guint32 mask_pixel;
 114         if (colormap == NULL)
 115             // mono bitmap, white is pixel value 0
 116             mask_pixel = guint32(colour.Red() != 255 || colour.Green() != 255 || colour.Blue() != 255);
 117         else
 118         {
 119             wxColor c(colour);
 120             c.CalcPixel(colormap);
 121             mask_pixel = c.GetPixel();
 122         }
 123         for (int y = 0; y < h; y++)
 124         {
 125             for (int x = 0; x < w; x++, bit_index++)
 126                 if (gdk_image_get_pixel(image, x, y) == mask_pixel)
 127                     out[bit_index >> 3] ^= 1 << (bit_index & 7);
 128             bit_index = (bit_index + 7) & ~7u;
 129         }
 130         g_object_unref(image);
 131     }
 132     m_bitmap = gdk_bitmap_create_from_data(wxGetRootWindow()->window, (char*)out, w, h);
 133     delete[] out;
 134     return true;
 135 }
 136
 137 #if wxUSE_PALETTE
 138 bool wxMask::Create( const wxBitmap& bitmap, int paletteIndex )
 139 {
 140     unsigned char r,g,b;
 141     wxPalette *pal = bitmap.GetPalette();
 142
 143     wxCHECK_MSG( pal, false, wxT("Cannot create mask from bitmap without palette") );
 144
 145     pal->GetRGB(paletteIndex, &r, &g, &b);
 146
 147     return Create(bitmap, wxColour(r, g, b));
 148 }
 149 #endif // wxUSE_PALETTE
 150
 151 bool wxMask::Create( const wxBitmap& bitmap )
 152 {
 153     if (m_bitmap)
 154     {
 155         g_object_unref (m_bitmap);
 156         m_bitmap = (GdkBitmap*) NULL;
 157     }
 158
 159     if (!bitmap.Ok()) return false;
 160
 161     wxCHECK_MSG( bitmap.GetDepth() == 1, false, wxT("Cannot create mask from colour bitmap") );
 162
 163     m_bitmap = gdk_pixmap_new( wxGetRootWindow()->window, bitmap.GetWidth(), bitmap.GetHeight(), 1 );
 164
 165     if (!m_bitmap) return false;
 166
 167     GdkGC *gc = gdk_gc_new( m_bitmap );
 168     gdk_gc_set_function(gc, GDK_COPY_INVERT);
 169     gdk_draw_drawable(m_bitmap, gc, bitmap.GetPixmap(), 0, 0, 0, 0, bitmap.GetWidth(), bitmap.GetHeight());
 170     g_object_unref (gc);
 171
 172     return true;
 173 }
 174
 175 GdkBitmap *wxMask::GetBitmap() const
 176 {
 177     return m_bitmap;
 178 }
 179
 180 //-----------------------------------------------------------------------------
 181 // wxBitmap
 182 //-----------------------------------------------------------------------------
 183
 184 class wxBitmapRefData: public wxObjectRefData
 185 {
 186 public:
 187     wxBitmapRefData();
 188     virtual ~wxBitmapRefData();
 189
 190     GdkPixmap      *m_pixmap;
 191     GdkPixbuf      *m_pixbuf;
 192     wxMask         *m_mask;
 193     int             m_width;
 194     int             m_height;
 195     int             m_bpp;
 196 #if wxUSE_PALETTE
 197     wxPalette      *m_palette;
 198 #endif // wxUSE_PALETTE
 199 };
 200
 201 wxBitmapRefData::wxBitmapRefData()
 202 {
 203     m_pixmap = (GdkPixmap *) NULL;
 204     m_pixbuf = (GdkPixbuf *) NULL;
 205     m_mask = (wxMask *) NULL;
 206     m_width = 0;
 207     m_height = 0;
 208     m_bpp = 0;
 209 #if wxUSE_PALETTE
 210     m_palette = (wxPalette *) NULL;
 211 #endif // wxUSE_PALETTE
 212 }
 213
 214 wxBitmapRefData::~wxBitmapRefData()
 215 {
 216     if (m_pixmap)
 217         g_object_unref (m_pixmap);
 218     if (m_pixbuf)
 219         g_object_unref (m_pixbuf);
 220     delete m_mask;
 221 #if wxUSE_PALETTE
 222     delete m_palette;
 223 #endif // wxUSE_PALETTE
 224 }
 225
 226 //-----------------------------------------------------------------------------
 227
 228 #define M_BMPDATA wx_static_cast(wxBitmapRefData*, m_refData)
 229
 230 IMPLEMENT_DYNAMIC_CLASS(wxBitmap,wxGDIObject)
 231
 232 wxBitmap::wxBitmap(int width, int height, int depth)
 233 {
 234     Create(width, height, depth);
 235 }
 236
 237 wxBitmap::wxBitmap(const wxString &filename, wxBitmapType type)
 238 {
 239     LoadFile(filename, type);
 240 }
 241
 242 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 243 {
 244     wxASSERT(depth == 1);
 245     if (width > 0 && height > 0 && depth == 1)
 246     {
 247         SetPixmap(gdk_bitmap_create_from_data(wxGetRootWindow()->window, bits, width, height));
 248
 249         wxASSERT_MSG( M_BMPDATA->m_pixmap, wxT("couldn't create bitmap") );
 250     }
 251 }
 252
 253 wxBitmap::wxBitmap(const char* const* bits)
 254 {
 255     wxCHECK2_MSG(bits != NULL, return, wxT("invalid bitmap data"));
 256
 257     GdkBitmap* mask = NULL;
 258     SetPixmap(gdk_pixmap_create_from_xpm_d(wxGetRootWindow()->window, &mask, NULL, wx_const_cast(char**, bits)));
 259
 260     if (M_BMPDATA->m_pixmap != NULL && mask != NULL)
 261     {
 262         M_BMPDATA->m_mask = new wxMask;
 263         M_BMPDATA->m_mask->m_bitmap = mask;
 264     }
 265 }
 266
 267 wxBitmap::~wxBitmap()
 268 {
 269 }
 270
 271 bool wxBitmap::Create( int width, int height, int depth )
 272 {
 273     UnRef();
 274
 275     if ( width <= 0 || height <= 0 )
 276     {
 277         return false;
 278     }
 279
 280     if (depth == 32)
 281     {
 282         SetPixbuf(gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8, width, height), 32);
 283     }
 284     else
 285     {
 286         if (depth != 1)
 287         {
 288             const GdkVisual* visual = wxTheApp->GetGdkVisual();
 289             if (depth == -1)
 290                 depth = visual->depth;
 291
 292             wxCHECK_MSG(depth == visual->depth, false, wxT("invalid bitmap depth"));
 293         }
 294
 295         SetPixmap(gdk_pixmap_new(wxGetRootWindow()->window, width, height, depth));
 296     }
 297
 298     return Ok();
 299 }
 300
 301 wxBitmap wxBitmap::Rescale(int clipx, int clipy, int clipwidth, int clipheight, int newx, int newy) const
 302 {
 303     wxBitmap bmp;
 304
 305     wxCHECK_MSG(Ok(), bmp, wxT("invalid bitmap"));
 306
 307     if (newy==M_BMPDATA->m_width && newy==M_BMPDATA->m_height)
 308         return *this;
 309
 310     int width = wxMax(newx, 1);
 311     int height = wxMax(newy, 1);
 312     width = wxMin(width, clipwidth);
 313     height = wxMin(height, clipheight);
 314
 315     // scale pixbuf if available and it has alpha or there is no mask
 316     if (M_BMPDATA->m_pixbuf != NULL && (
 317         M_BMPDATA->m_mask == NULL || gdk_pixbuf_get_has_alpha(M_BMPDATA->m_pixbuf)))
 318     {
 319         bmp.SetPixbuf(gdk_pixbuf_new(GDK_COLORSPACE_RGB,
 320                                      gdk_pixbuf_get_has_alpha(M_BMPDATA->m_pixbuf),
 321                                      8, width, height), M_BMPDATA->m_bpp);
 322         gdk_pixbuf_scale(M_BMPDATA->m_pixbuf, bmp.GetPixbuf(),
 323                          0, 0, width, height,
 324                          clipx, clipy,
 325                          (double)newx/GetWidth(), (double)newy/GetHeight(),
 326                          GDK_INTERP_BILINEAR);
 327     }
 328     else
 329     {
 330         GdkImage* img = gdk_drawable_get_image(
 331             M_BMPDATA->m_pixmap, 0, 0, M_BMPDATA->m_width, M_BMPDATA->m_height);
 332
 333         wxCHECK_MSG(img, bmp, wxT("couldn't create image"));
 334
 335         GdkGC *gc = NULL;
 336         GdkPixmap *dstpix = NULL;
 337         char *dst = NULL;
 338         long dstbyteperline = 0;
 339
 340         if (GetDepth() != 1)
 341         {
 342             bmp.Create(width, height, gdk_drawable_get_depth(M_BMPDATA->m_pixmap));
 343             dstpix = bmp.GetPixmap();
 344             gc = gdk_gc_new( dstpix );
 345         }
 346         else
 347         {
 348             dstbyteperline = (width + 7) / 8;
 349             dst = (char*) malloc(dstbyteperline*height);
 350         }
 351
 352         // be careful to use the right scaling factor
 353         float scx = (float)M_BMPDATA->m_width/(float)newx;
 354         float scy = (float)M_BMPDATA->m_height/(float)newy;
 355         // prepare accel-tables
 356         int *tablex = (int *)calloc(width,sizeof(int));
 357         int *tabley = (int *)calloc(height,sizeof(int));
 358
 359         // accel table filled with clipped values
 360         for (int x = 0; x < width; x++)
 361             tablex[x] = (int) (scx * (x+clipx));
 362         for (int y = 0; y < height; y++)
 363             tabley[y] = (int) (scy * (y+clipy));
 364
 365         // Main rescaling routine starts here
 366         for (int h = 0; h < height; h++)
 367         {
 368             char outbyte = 0;
 369             int old_x = -1;
 370             guint32 old_pixval = 0;
 371
 372             for (int w = 0; w < width; w++)
 373             {
 374                 guint32 pixval;
 375                 int x = tablex[w];
 376                 if (x == old_x)
 377                     pixval = old_pixval;
 378                 else
 379                 {
 380                     pixval = gdk_image_get_pixel( img, x, tabley[h] );
 381                     old_pixval = pixval;
 382                     old_x = x;
 383                 }
 384
 385                 if ( dst )
 386                 {
 387                     if (pixval)
 388                     {
 389                         char bit=1;
 390                         char shift = bit << (w % 8);
 391                         outbyte |= shift;
 392                     }
 393
 394                     if ((w+1)%8==0)
 395                     {
 396                         dst[h*dstbyteperline+w/8] = outbyte;
 397                         outbyte = 0;
 398                     }
 399                 }
 400                 else
 401                 {
 402                     GdkColor col;
 403                     col.pixel = pixval;
 404                     gdk_gc_set_foreground( gc, &col );
 405                     gdk_draw_point( dstpix, gc, w, h);
 406                 }
 407             }
 408
 409             // do not forget the last byte
 410             if ( dst && (width % 8 != 0) )
 411                 dst[h*dstbyteperline+width/8] = outbyte;
 412         }
 413
 414         g_object_unref (img);
 415         if (gc) g_object_unref (gc);
 416
 417         if ( dst )
 418         {
 419             bmp = wxBitmap(dst, width, height, 1);
 420             free( dst );
 421         }
 422
 423         if (GetMask())
 424         {
 425             dstbyteperline = (width + 7) / 8;
 426             dst = (char*) malloc(dstbyteperline*height);
 427             img = gdk_drawable_get_image(GetMask()->GetBitmap(), 0, 0, GetWidth(), GetHeight());
 428
 429             for (int h = 0; h < height; h++)
 430             {
 431                 char outbyte = 0;
 432                 int old_x = -1;
 433                 guint32 old_pixval = 0;
 434
 435                 for (int w = 0; w < width; w++)
 436                 {
 437                     guint32 pixval;
 438                     int x = tablex[w];
 439                     if (x == old_x)
 440                         pixval = old_pixval;
 441                     else
 442                     {
 443                         pixval = gdk_image_get_pixel( img, x, tabley[h] );
 444                         old_pixval = pixval;
 445                         old_x = x;
 446                     }
 447
 448                     if (pixval)
 449                     {
 450                         char bit=1;
 451                         char shift = bit << (w % 8);
 452                         outbyte |= shift;
 453                     }
 454
 455                     if ((w+1)%8 == 0)
 456                     {
 457                         dst[h*dstbyteperline+w/8] = outbyte;
 458                         outbyte = 0;
 459                     }
 460                 }
 461
 462                 // do not forget the last byte
 463                 if (width % 8 != 0)
 464                     dst[h*dstbyteperline+width/8] = outbyte;
 465             }
 466             wxMask* mask = new wxMask;
 467             mask->m_bitmap = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) dst, width, height );
 468             bmp.SetMask(mask);
 469
 470             free( dst );
 471             g_object_unref (img);
 472         }
 473
 474         free( tablex );
 475         free( tabley );
 476     }
 477
 478     return bmp;
 479 }
 480
 481 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
 482 {
 483     UnRef();
 484
 485     wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
 486     wxCHECK_MSG( depth == -1 || depth == 1, false, wxT("invalid bitmap depth") );
 487
 488     if (image.GetWidth() <= 0 || image.GetHeight() <= 0)
 489         return false;
 490
 491     // create pixbuf if image has alpha and requested depth is compatible
 492     if (image.HasAlpha() && (depth == -1 || depth == 32))
 493         return CreateFromImageAsPixbuf(image);
 494
 495     // otherwise create pixmap, if alpha is present it will be converted to mask
 496     return CreateFromImageAsPixmap(image, depth);
 497 }
 498
 499 bool wxBitmap::CreateFromImageAsPixmap(const wxImage& image, int depth)
 500 {
 501     const int w = image.GetWidth();
 502     const int h = image.GetHeight();
 503     if (depth == 1)
 504     {
 505         // create XBM format bitmap
 506
 507         // one bit per pixel, each row starts on a byte boundary
 508         const size_t out_size = size_t((w + 7) / 8) * unsigned(h);
 509         wxByte* out = new wxByte[out_size];
 510         // set bits are black
 511         memset(out, 0xff, out_size);
 512         const wxByte* in = image.GetData();
 513         unsigned bit_index = 0;
 514         for (int y = 0; y < h; y++)
 515         {
 516             for (int x = 0; x < w; x++, in += 3, bit_index++)
 517                 if (in[0] == 255 && in[1] == 255 && in[2] == 255)
 518                     out[bit_index >> 3] ^= 1 << (bit_index & 7);
 519             // move index to next byte boundary
 520             bit_index = (bit_index + 7) & ~7u;
 521         }
 522         SetPixmap(gdk_bitmap_create_from_data(wxGetRootWindow()->window, (char*)out, w, h));
 523         delete[] out;
 524     }
 525     else
 526     {
 527         SetPixmap(gdk_pixmap_new(wxGetRootWindow()->window, w, h, depth));
 528         GdkGC* gc = gdk_gc_new(M_BMPDATA->m_pixmap);
 529         gdk_draw_rgb_image(
 530             M_BMPDATA->m_pixmap, gc,
 531             0, 0, w, h,
 532             GDK_RGB_DITHER_NONE, image.GetData(), w * 3);
 533         g_object_unref(gc);
 534     }
 535
 536     const wxByte* alpha = image.GetAlpha();
 537     if (alpha != NULL || image.HasMask())
 538     {
 539         // create mask as XBM format bitmap
 540
 541         const size_t out_size = size_t((w + 7) / 8) * unsigned(h);
 542         wxByte* out = new wxByte[out_size];
 543         memset(out, 0xff, out_size);
 544         unsigned bit_index = 0;
 545         if (alpha != NULL)
 546         {
 547             for (int y = 0; y < h; y++)
 548             {
 549                 for (int x = 0; x < w; x++, bit_index++)
 550                     if (*alpha++ < wxIMAGE_ALPHA_THRESHOLD)
 551                         out[bit_index >> 3] ^= 1 << (bit_index & 7);
 552                 bit_index = (bit_index + 7) & ~7u;
 553             }
 554         }
 555         else
 556         {
 557             const wxByte r_mask = image.GetMaskRed();
 558             const wxByte g_mask = image.GetMaskGreen();
 559             const wxByte b_mask = image.GetMaskBlue();
 560             const wxByte* in = image.GetData();
 561             for (int y = 0; y < h; y++)
 562             {
 563                 for (int x = 0; x < w; x++, in += 3, bit_index++)
 564                     if (in[0] == r_mask && in[1] == g_mask && in[2] == b_mask)
 565                         out[bit_index >> 3] ^= 1 << (bit_index & 7);
 566                 bit_index = (bit_index + 7) & ~7u;
 567             }
 568         }
 569         wxMask* mask = new wxMask;
 570         mask->m_bitmap = gdk_bitmap_create_from_data(M_BMPDATA->m_pixmap, (char*)out, w, h);
 571         SetMask(mask);
 572         delete[] out;
 573     }
 574     return true;
 575 }
 576
 577 bool wxBitmap::CreateFromImageAsPixbuf(const wxImage& image)
 578 {
 579     wxASSERT(image.HasAlpha());
 580
 581     int width = image.GetWidth();
 582     int height = image.GetHeight();
 583
 584     Create(width, height, 32);
 585     GdkPixbuf* pixbuf = M_BMPDATA->m_pixbuf;
 586     if (!pixbuf)
 587         return false;
 588
 589     // Copy the data:
 590     const unsigned char* in = image.GetData();
 591     unsigned char *out = gdk_pixbuf_get_pixels(pixbuf);
 592     unsigned char *alpha = image.GetAlpha();
 593
 594     int rowpad = gdk_pixbuf_get_rowstride(pixbuf) - 4 * width;
 595
 596     for (int y = 0; y < height; y++, out += rowpad)
 597     {
 598         for (int x = 0; x < width; x++, alpha++, out += 4, in += 3)
 599         {
 600             out[0] = in[0];
 601             out[1] = in[1];
 602             out[2] = in[2];
 603             out[3] = *alpha;
 604         }
 605     }
 606
 607     return true;
 608 }
 609
 610 wxImage wxBitmap::ConvertToImage() const
 611 {
 612     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 613
 614     const int w = GetWidth();
 615     const int h = GetHeight();
 616     wxImage image(w, h, false);
 617     unsigned char *data = image.GetData();
 618
 619     wxCHECK_MSG(data != NULL, wxNullImage, wxT("couldn't create image") );
 620
 621     // prefer pixbuf if available, it will preserve alpha and should be quicker
 622     if (HasPixbuf())
 623     {
 624         GdkPixbuf *pixbuf = GetPixbuf();
 625         unsigned char* alpha = NULL;
 626         if (gdk_pixbuf_get_has_alpha(pixbuf))
 627         {
 628             image.SetAlpha();
 629             alpha = image.GetAlpha();
 630         }
 631         const unsigned char* in = gdk_pixbuf_get_pixels(pixbuf);
 632         unsigned char *out = data;
 633         const int inc = 3 + int(alpha != NULL);
 634         const int rowpad = gdk_pixbuf_get_rowstride(pixbuf) - inc * w;
 635
 636         for (int y = 0; y < h; y++, in += rowpad)
 637         {
 638             for (int x = 0; x < w; x++, in += inc, out += 3)
 639             {
 640                 out[0] = in[0];
 641                 out[1] = in[1];
 642                 out[2] = in[2];
 643                 if (alpha != NULL)
 644                     *alpha++ = in[3];
 645             }
 646         }
 647     }
 648     else
 649     {
 650         GdkPixmap* pixmap = GetPixmap();
 651         GdkPixmap* pixmap_invert = NULL;
 652         if (GetDepth() == 1)
 653         {
 654             // mono bitmaps are inverted, i.e. 0 is white
 655             pixmap_invert = gdk_pixmap_new(pixmap, w, h, 1);
 656             GdkGC* gc = gdk_gc_new(pixmap_invert);
 657             gdk_gc_set_function(gc, GDK_COPY_INVERT);
 658             gdk_draw_drawable(pixmap_invert, gc, pixmap, 0, 0, 0, 0, w, h);
 659             g_object_unref(gc);
 660             pixmap = pixmap_invert;
 661         }
 662         // create a pixbuf which shares data with the wxImage
 663         GdkPixbuf* pixbuf = gdk_pixbuf_new_from_data(
 664             data, GDK_COLORSPACE_RGB, false, 8, w, h, 3 * w, NULL, NULL);
 665
 666         gdk_pixbuf_get_from_drawable(pixbuf, pixmap, NULL, 0, 0, 0, 0, w, h);
 667
 668         g_object_unref(pixbuf);
 669         if (pixmap_invert != NULL)
 670             g_object_unref(pixmap_invert);
 671     }
 672     // convert mask, unless there is already alpha
 673     if (GetMask() && !image.HasAlpha())
 674     {
 675         // we hard code the mask colour for now but we could also make an
 676         // effort (and waste time) to choose a colour not present in the
 677         // image already to avoid having to fudge the pixels below --
 678         // whether it's worth to do it is unclear however
 679         const int MASK_RED = 1;
 680         const int MASK_GREEN = 2;
 681         const int MASK_BLUE = 3;
 682         const int MASK_BLUE_REPLACEMENT = 2;
 683
 684         image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
 685         GdkImage* image_mask = gdk_drawable_get_image(GetMask()->GetBitmap(), 0, 0, w, h);
 686
 687         for (int y = 0; y < h; y++)
 688         {
 689             for (int x = 0; x < w; x++, data += 3)
 690             {
 691                 if (gdk_image_get_pixel(image_mask, x, y) == 0)
 692                 {
 693                     data[0] = MASK_RED;
 694                     data[1] = MASK_GREEN;
 695                     data[2] = MASK_BLUE;
 696                 }
 697                 else if (data[0] == MASK_RED && data[1] == MASK_GREEN && data[2] == MASK_BLUE)
 698                 {
 699                     // we have to fudge the colour a bit to prevent
 700                     // this pixel from appearing transparent
 701                     data[2] = MASK_BLUE_REPLACEMENT;
 702                 }
 703             }
 704         }
 705         g_object_unref(image_mask);
 706     }
 707
 708     return image;
 709 }
 710
 711 bool wxBitmap::operator == ( const wxBitmap& bmp ) const
 712 {
 713     return m_refData == bmp.m_refData;
 714 }
 715
 716 bool wxBitmap::IsOk() const
 717 {
 718     return (m_refData != NULL) &&
 719            (
 720               M_BMPDATA->m_pixbuf ||
 721               M_BMPDATA->m_pixmap
 722            );
 723 }
 724
 725 int wxBitmap::GetHeight() const
 726 {
 727     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 728
 729     return M_BMPDATA->m_height;
 730 }
 731
 732 int wxBitmap::GetWidth() const
 733 {
 734     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 735
 736     return M_BMPDATA->m_width;
 737 }
 738
 739 int wxBitmap::GetDepth() const
 740 {
 741     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 742
 743     return M_BMPDATA->m_bpp;
 744 }
 745
 746 wxMask *wxBitmap::GetMask() const
 747 {
 748     wxCHECK_MSG( Ok(), (wxMask *) NULL, wxT("invalid bitmap") );
 749
 750     return M_BMPDATA->m_mask;
 751 }
 752
 753 void wxBitmap::SetMask( wxMask *mask )
 754 {
 755     wxCHECK_RET( Ok(), wxT("invalid bitmap") );
 756
 757     AllocExclusive();
 758     delete M_BMPDATA->m_mask;
 759     M_BMPDATA->m_mask = mask;
 760 }
 761
 762 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
 763 {
 764     *this = icon;
 765     return Ok();
 766 }
 767
 768 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
 769 {
 770     wxBitmap ret;
 771
 772     wxCHECK_MSG(Ok(), ret, wxT("invalid bitmap"));
 773     wxCHECK_MSG(rect.x >= 0 && rect.y >= 0 &&
 774                 rect.x + rect.width <= M_BMPDATA->m_width &&
 775                 rect.y + rect.height <= M_BMPDATA->m_height,
 776                 ret, wxT("invalid bitmap region"));
 777
 778     if (HasPixbuf() || M_BMPDATA->m_bpp == 32)
 779     {
 780         GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB,
 781                                            gdk_pixbuf_get_has_alpha(GetPixbuf()),
 782                                            8, rect.width, rect.height);
 783         ret.SetPixbuf(pixbuf, M_BMPDATA->m_bpp);
 784         gdk_pixbuf_copy_area(GetPixbuf(),
 785                              rect.x, rect.y, rect.width, rect.height,
 786                              pixbuf, 0, 0);
 787     }
 788     else
 789     {
 790         ret.Create(rect.width, rect.height, M_BMPDATA->m_bpp);
 791         GdkGC *gc = gdk_gc_new( ret.GetPixmap() );
 792         gdk_draw_drawable( ret.GetPixmap(), gc, GetPixmap(), rect.x, rect.y, 0, 0, rect.width, rect.height );
 793         g_object_unref (gc);
 794     }
 795     // make mask, unless there is already alpha
 796     if (GetMask() && !HasAlpha())
 797     {
 798         wxMask *mask = new wxMask;
 799         mask->m_bitmap = gdk_pixmap_new( wxGetRootWindow()->window, rect.width, rect.height, 1 );
 800
 801         GdkGC *gc = gdk_gc_new( mask->m_bitmap );
 802         gdk_draw_drawable(mask->m_bitmap, gc, M_BMPDATA->m_mask->m_bitmap, rect.x, rect.y, 0, 0, rect.width, rect.height);
 803         g_object_unref (gc);
 804
 805         ret.SetMask( mask );
 806     }
 807
 808     return ret;
 809 }
 810
 811 bool wxBitmap::SaveFile( const wxString &name, wxBitmapType type, const wxPalette *WXUNUSED(palette) ) const
 812 {
 813     wxCHECK_MSG( Ok(), false, wxT("invalid bitmap") );
 814
 815     // Try to save the bitmap via wxImage handlers:
 816     wxImage image = ConvertToImage();
 817     return image.Ok() && image.SaveFile(name, type);
 818 }
 819
 820 bool wxBitmap::LoadFile( const wxString &name, wxBitmapType type )
 821 {
 822     UnRef();
 823
 824     if (type == wxBITMAP_TYPE_XPM)
 825     {
 826         GdkBitmap *mask = (GdkBitmap*) NULL;
 827         SetPixmap(gdk_pixmap_create_from_xpm(wxGetRootWindow()->window, &mask, NULL, name.fn_str()));
 828
 829         if (mask)
 830         {
 831             M_BMPDATA->m_mask = new wxMask;
 832             M_BMPDATA->m_mask->m_bitmap = mask;
 833         }
 834     }
 835     else // try if wxImage can load it
 836     {
 837         wxImage image;
 838         if (image.LoadFile(name, type) && image.Ok())
 839             CreateFromImage(image, -1);
 840     }
 841
 842     return Ok();
 843 }
 844
 845 #if wxUSE_PALETTE
 846 wxPalette *wxBitmap::GetPalette() const
 847 {
 848     wxCHECK_MSG(Ok(), NULL, wxT("invalid bitmap"));
 849
 850     return M_BMPDATA->m_palette;
 851 }
 852
 853 void wxBitmap::SetPalette(const wxPalette& WXUNUSED(palette))
 854 {
 855     // TODO
 856 }
 857 #endif // wxUSE_PALETTE
 858
 859 void wxBitmap::SetHeight( int height )
 860 {
 861     AllocExclusive();
 862     M_BMPDATA->m_height = height;
 863 }
 864
 865 void wxBitmap::SetWidth( int width )
 866 {
 867     AllocExclusive();
 868     M_BMPDATA->m_width = width;
 869 }
 870
 871 void wxBitmap::SetDepth( int depth )
 872 {
 873     AllocExclusive();
 874     M_BMPDATA->m_bpp = depth;
 875 }
 876
 877 void wxBitmap::SetPixmap( GdkPixmap *pixmap )
 878 {
 879     if (!m_refData)
 880         m_refData = new wxBitmapRefData;
 881
 882     // AllocExclusive should not be needed for this internal function
 883     wxASSERT(m_refData->GetRefCount() == 1);
 884     wxASSERT(M_BMPDATA->m_pixmap == NULL);
 885     M_BMPDATA->m_pixmap = pixmap;
 886     gdk_drawable_get_size(pixmap, &M_BMPDATA->m_width, &M_BMPDATA->m_height);
 887     M_BMPDATA->m_bpp = gdk_drawable_get_depth(pixmap);
 888     PurgeOtherRepresentations(Pixmap);
 889 }
 890
 891 GdkPixmap *wxBitmap::GetPixmap() const
 892 {
 893     wxCHECK_MSG( Ok(), (GdkPixmap *) NULL, wxT("invalid bitmap") );
 894
 895     // create the pixmap on the fly if we use Pixbuf representation:
 896     if (M_BMPDATA->m_pixmap == NULL)
 897     {
 898         GdkPixmap** pmask = NULL;
 899         if (gdk_pixbuf_get_has_alpha(M_BMPDATA->m_pixbuf))
 900         {
 901             // make new mask from alpha
 902             delete M_BMPDATA->m_mask;
 903             M_BMPDATA->m_mask = new wxMask;
 904             pmask = &M_BMPDATA->m_mask->m_bitmap;
 905         }
 906         gdk_pixbuf_render_pixmap_and_mask(M_BMPDATA->m_pixbuf,
 907                                           &M_BMPDATA->m_pixmap,
 908                                           pmask,
 909                                           wxIMAGE_ALPHA_THRESHOLD);
 910     }
 911
 912     return M_BMPDATA->m_pixmap;
 913 }
 914
 915 bool wxBitmap::HasPixmap() const
 916 {
 917     wxCHECK_MSG( Ok(), false, wxT("invalid bitmap") );
 918
 919     return M_BMPDATA->m_pixmap != NULL;
 920 }
 921
 922 GdkPixbuf *wxBitmap::GetPixbuf() const
 923 {
 924     wxCHECK_MSG( Ok(), NULL, wxT("invalid bitmap") );
 925
 926     if (M_BMPDATA->m_pixbuf == NULL)
 927     {
 928         int width = GetWidth();
 929         int height = GetHeight();
 930
 931         GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB,
 932                                            GetMask() != NULL,
 933                                            8, width, height);
 934         M_BMPDATA->m_pixbuf = pixbuf;
 935         gdk_pixbuf_get_from_drawable(pixbuf, M_BMPDATA->m_pixmap, NULL,
 936                                      0, 0, 0, 0, width, height);
 937
 938         // apply the mask to created pixbuf:
 939         if (M_BMPDATA->m_pixbuf && M_BMPDATA->m_mask)
 940         {
 941             GdkPixbuf *pmask =
 942                 gdk_pixbuf_get_from_drawable(NULL,
 943                                              M_BMPDATA->m_mask->GetBitmap(),
 944                                              NULL,
 945                                              0, 0, 0, 0, width, height);
 946             if (pmask)
 947             {
 948                 guchar *bmp = gdk_pixbuf_get_pixels(pixbuf);
 949                 guchar *mask = gdk_pixbuf_get_pixels(pmask);
 950                 int bmprowinc = gdk_pixbuf_get_rowstride(pixbuf) - 4 * width;
 951                 int maskrowinc = gdk_pixbuf_get_rowstride(pmask) - 3 * width;
 952
 953                 for (int y = 0; y < height;
 954                      y++, bmp += bmprowinc, mask += maskrowinc)
 955                 {
 956                     for (int x = 0; x < width; x++, bmp += 4, mask += 3)
 957                     {
 958                         if (mask[0] == 0 /*black pixel*/)
 959                             bmp[3] = 0;
 960                     }
 961                 }
 962
 963                 g_object_unref (pmask);
 964             }
 965         }
 966     }
 967
 968     return M_BMPDATA->m_pixbuf;
 969 }
 970
 971 bool wxBitmap::HasPixbuf() const
 972 {
 973     wxCHECK_MSG( Ok(), false, wxT("invalid bitmap") );
 974
 975     return M_BMPDATA->m_pixbuf != NULL;
 976 }
 977
 978 void wxBitmap::SetPixbuf(GdkPixbuf* pixbuf, int depth)
 979 {
 980     if (!m_refData)
 981         m_refData = new wxBitmapRefData;
 982
 983     // AllocExclusive should not be needed for this internal function
 984     wxASSERT(m_refData->GetRefCount() == 1);
 985     wxASSERT(M_BMPDATA->m_pixbuf == NULL);
 986     M_BMPDATA->m_pixbuf = pixbuf;
 987     M_BMPDATA->m_width = gdk_pixbuf_get_width(pixbuf);
 988     M_BMPDATA->m_height = gdk_pixbuf_get_height(pixbuf);
 989     // if depth specified
 990     if (depth != 0)
 991         M_BMPDATA->m_bpp = depth;
 992     else if (M_BMPDATA->m_bpp == 0)
 993         // use something reasonable
 994         M_BMPDATA->m_bpp = wxTheApp->GetGdkVisual()->depth;
 995     PurgeOtherRepresentations(Pixbuf);
 996 }
 997
 998 void wxBitmap::PurgeOtherRepresentations(wxBitmap::Representation keep)
 999 {
1000     if (keep == Pixmap && HasPixbuf())
1001     {
1002         g_object_unref (M_BMPDATA->m_pixbuf);
1003         M_BMPDATA->m_pixbuf = NULL;
1004     }
1005     if (keep == Pixbuf && HasPixmap())
1006     {
1007         g_object_unref (M_BMPDATA->m_pixmap);
1008         M_BMPDATA->m_pixmap = NULL;
1009     }
1010 }
1011
1012 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1013 {
1014     void* bits = NULL;
1015     GdkPixbuf *pixbuf = GetPixbuf();
1016     const bool hasAlpha = HasAlpha();
1017     // allow access if bpp is valid and matches existence of alpha
1018     if (pixbuf != NULL && (
1019         bpp == 24 && !hasAlpha ||
1020         bpp == 32 && hasAlpha))
1021     {
1022         data.m_height = gdk_pixbuf_get_height( pixbuf );
1023         data.m_width = gdk_pixbuf_get_width( pixbuf );
1024         data.m_stride = gdk_pixbuf_get_rowstride( pixbuf );
1025         bits = gdk_pixbuf_get_pixels(pixbuf);
1026     }
1027     return bits;
1028 }
1029
1030 void wxBitmap::UngetRawData(wxPixelDataBase& WXUNUSED(data))
1031 {
1032 }
1033
1034 bool wxBitmap::HasAlpha() const
1035 {
1036     return m_refData != NULL && M_BMPDATA->m_pixbuf != NULL &&
1037         gdk_pixbuf_get_has_alpha(M_BMPDATA->m_pixbuf);
1038 }
1039
1040 void wxBitmap::UseAlpha()
1041 {
1042     GdkPixbuf* pixbuf = GetPixbuf();
1043     // add alpha if necessary
1044     if (!gdk_pixbuf_get_has_alpha(pixbuf))
1045     {
1046         M_BMPDATA->m_pixbuf = NULL;
1047         AllocExclusive();
1048         M_BMPDATA->m_pixbuf = gdk_pixbuf_add_alpha(pixbuf, false, 0, 0, 0);
1049         g_object_unref(pixbuf);
1050     }
1051 }
1052
1053 wxObjectRefData* wxBitmap::CreateRefData() const
1054 {
1055     return new wxBitmapRefData;
1056 }
1057
1058 wxObjectRefData* wxBitmap::CloneRefData(const wxObjectRefData* data) const
1059 {
1060     const wxBitmapRefData* oldRef = wx_static_cast(const wxBitmapRefData*, data);
1061     wxBitmapRefData* newRef = new wxBitmapRefData;
1062     newRef->m_width = oldRef->m_width;
1063     newRef->m_height = oldRef->m_height;
1064     newRef->m_bpp = oldRef->m_bpp;
1065     if (oldRef->m_pixmap != NULL)
1066     {
1067         newRef->m_pixmap = gdk_pixmap_new(
1068             oldRef->m_pixmap, oldRef->m_width, oldRef->m_height,
1069             // use pixmap depth, m_bpp may not match
1070             gdk_drawable_get_depth(oldRef->m_pixmap));
1071         GdkGC* gc = gdk_gc_new(newRef->m_pixmap);
1072         gdk_draw_drawable(
1073             newRef->m_pixmap, gc, oldRef->m_pixmap, 0, 0, 0, 0, -1, -1);
1074         g_object_unref(gc);
1075     }
1076     if (oldRef->m_pixbuf != NULL)
1077     {
1078         newRef->m_pixbuf = gdk_pixbuf_copy(oldRef->m_pixbuf);
1079     }
1080     if (oldRef->m_mask != NULL)
1081     {
1082         newRef->m_mask = new wxMask;
1083         newRef->m_mask->m_bitmap = gdk_pixmap_new(
1084             oldRef->m_mask->m_bitmap, oldRef->m_width, oldRef->m_height, 1);
1085         GdkGC* gc = gdk_gc_new(newRef->m_mask->m_bitmap);
1086         gdk_draw_drawable(newRef->m_mask->m_bitmap,
1087             gc, oldRef->m_mask->m_bitmap, 0, 0, 0, 0, -1, -1);
1088         g_object_unref(gc);
1089     }
1090 #if wxUSE_PALETTE
1091     // implement this if SetPalette is ever implemented
1092     wxASSERT(oldRef->m_palette == NULL);
1093 #endif
1094
1095     return newRef;
1096 }
1097
1098 //-----------------------------------------------------------------------------
1099 // wxBitmapHandler
1100 //-----------------------------------------------------------------------------
1101
1102 IMPLEMENT_ABSTRACT_CLASS(wxBitmapHandler, wxBitmapHandlerBase)
1103
1104 /* static */ void wxBitmap::InitStandardHandlers()
1105 {
1106     // TODO: Insert handler based on GdkPixbufs handler later
1107 }