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     int width = wxMax(newx, 1);
 308     int height = wxMax(newy, 1);
 309     width = wxMin(width, clipwidth);
 310     height = wxMin(height, clipheight);
 311
 312     const double scale_x = double(newx) / M_BMPDATA->m_width;
 313     const double scale_y = double(newy) / M_BMPDATA->m_height;
 314
 315     // Converting to pixbuf, scaling with gdk_pixbuf_scale, and converting
 316     // back, is faster than scaling pixmap ourselves.
 317
 318     // use pixbuf if already available,
 319     // otherwise create temporary pixbuf from pixmap
 320     GdkPixbuf* pixbuf = M_BMPDATA->m_pixbuf;
 321     if (pixbuf)
 322         g_object_ref(pixbuf);
 323     else
 324         pixbuf = gdk_pixbuf_get_from_drawable(
 325             NULL, M_BMPDATA->m_pixmap, NULL,
 326             0, 0, 0, 0, M_BMPDATA->m_width, M_BMPDATA->m_height);
 327
 328     // new pixbuf for scaled wxBitmap
 329     GdkPixbuf* pixbuf_scaled = gdk_pixbuf_new(
 330         GDK_COLORSPACE_RGB, gdk_pixbuf_get_has_alpha(pixbuf), 8, width, height);
 331
 332     // GDK_INTERP_NEAREST is the lowest-quality method for continuous-tone
 333     // images, but the only one which preserves sharp edges
 334     gdk_pixbuf_scale(
 335         pixbuf, pixbuf_scaled,
 336         0, 0, width, height, -clipx, -clipy, scale_x, scale_y,
 337         GDK_INTERP_NEAREST);
 338
 339     g_object_unref(pixbuf);
 340     bmp.SetPixbuf(pixbuf_scaled, M_BMPDATA->m_bpp);
 341
 342     if (M_BMPDATA->m_mask)
 343     {
 344         pixbuf = gdk_pixbuf_get_from_drawable(
 345             NULL, M_BMPDATA->m_mask->m_bitmap, NULL,
 346             0, 0, 0, 0, M_BMPDATA->m_width, M_BMPDATA->m_height);
 347
 348         pixbuf_scaled = gdk_pixbuf_new(
 349             GDK_COLORSPACE_RGB, false, 8, width, height);
 350
 351         gdk_pixbuf_scale(
 352             pixbuf, pixbuf_scaled,
 353             0, 0, width, height, -clipx, -clipy, scale_x, scale_y,
 354             GDK_INTERP_NEAREST);
 355
 356         g_object_unref(pixbuf);
 357
 358         // use existing functionality to create mask from scaled pixbuf
 359         wxBitmap maskbmp;
 360         maskbmp.SetPixbuf(pixbuf_scaled);
 361         bmp.SetMask(new wxMask(maskbmp, *wxBLACK));
 362     }
 363     return bmp;
 364 }
 365
 366 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
 367 {
 368     UnRef();
 369
 370     wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
 371     wxCHECK_MSG( depth == -1 || depth == 1, false, wxT("invalid bitmap depth") );
 372
 373     if (image.GetWidth() <= 0 || image.GetHeight() <= 0)
 374         return false;
 375
 376     // create pixbuf if image has alpha and requested depth is compatible
 377     if (image.HasAlpha() && (depth == -1 || depth == 32))
 378         return CreateFromImageAsPixbuf(image);
 379
 380     // otherwise create pixmap, if alpha is present it will be converted to mask
 381     return CreateFromImageAsPixmap(image, depth);
 382 }
 383
 384 bool wxBitmap::CreateFromImageAsPixmap(const wxImage& image, int depth)
 385 {
 386     const int w = image.GetWidth();
 387     const int h = image.GetHeight();
 388     if (depth == 1)
 389     {
 390         // create XBM format bitmap
 391
 392         // one bit per pixel, each row starts on a byte boundary
 393         const size_t out_size = size_t((w + 7) / 8) * unsigned(h);
 394         wxByte* out = new wxByte[out_size];
 395         // set bits are black
 396         memset(out, 0xff, out_size);
 397         const wxByte* in = image.GetData();
 398         unsigned bit_index = 0;
 399         for (int y = 0; y < h; y++)
 400         {
 401             for (int x = 0; x < w; x++, in += 3, bit_index++)
 402                 if (in[0] == 255 && in[1] == 255 && in[2] == 255)
 403                     out[bit_index >> 3] ^= 1 << (bit_index & 7);
 404             // move index to next byte boundary
 405             bit_index = (bit_index + 7) & ~7u;
 406         }
 407         SetPixmap(gdk_bitmap_create_from_data(wxGetRootWindow()->window, (char*)out, w, h));
 408         delete[] out;
 409     }
 410     else
 411     {
 412         SetPixmap(gdk_pixmap_new(wxGetRootWindow()->window, w, h, depth));
 413         GdkGC* gc = gdk_gc_new(M_BMPDATA->m_pixmap);
 414         gdk_draw_rgb_image(
 415             M_BMPDATA->m_pixmap, gc,
 416             0, 0, w, h,
 417             GDK_RGB_DITHER_NONE, image.GetData(), w * 3);
 418         g_object_unref(gc);
 419     }
 420
 421     const wxByte* alpha = image.GetAlpha();
 422     if (alpha != NULL || image.HasMask())
 423     {
 424         // create mask as XBM format bitmap
 425
 426         const size_t out_size = size_t((w + 7) / 8) * unsigned(h);
 427         wxByte* out = new wxByte[out_size];
 428         memset(out, 0xff, out_size);
 429         unsigned bit_index = 0;
 430         if (alpha != NULL)
 431         {
 432             for (int y = 0; y < h; y++)
 433             {
 434                 for (int x = 0; x < w; x++, bit_index++)
 435                     if (*alpha++ < wxIMAGE_ALPHA_THRESHOLD)
 436                         out[bit_index >> 3] ^= 1 << (bit_index & 7);
 437                 bit_index = (bit_index + 7) & ~7u;
 438             }
 439         }
 440         else
 441         {
 442             const wxByte r_mask = image.GetMaskRed();
 443             const wxByte g_mask = image.GetMaskGreen();
 444             const wxByte b_mask = image.GetMaskBlue();
 445             const wxByte* in = image.GetData();
 446             for (int y = 0; y < h; y++)
 447             {
 448                 for (int x = 0; x < w; x++, in += 3, bit_index++)
 449                     if (in[0] == r_mask && in[1] == g_mask && in[2] == b_mask)
 450                         out[bit_index >> 3] ^= 1 << (bit_index & 7);
 451                 bit_index = (bit_index + 7) & ~7u;
 452             }
 453         }
 454         wxMask* mask = new wxMask;
 455         mask->m_bitmap = gdk_bitmap_create_from_data(M_BMPDATA->m_pixmap, (char*)out, w, h);
 456         SetMask(mask);
 457         delete[] out;
 458     }
 459     return true;
 460 }
 461
 462 bool wxBitmap::CreateFromImageAsPixbuf(const wxImage& image)
 463 {
 464     wxASSERT(image.HasAlpha());
 465
 466     int width = image.GetWidth();
 467     int height = image.GetHeight();
 468
 469     Create(width, height, 32);
 470     GdkPixbuf* pixbuf = M_BMPDATA->m_pixbuf;
 471     if (!pixbuf)
 472         return false;
 473
 474     // Copy the data:
 475     const unsigned char* in = image.GetData();
 476     unsigned char *out = gdk_pixbuf_get_pixels(pixbuf);
 477     unsigned char *alpha = image.GetAlpha();
 478
 479     int rowpad = gdk_pixbuf_get_rowstride(pixbuf) - 4 * width;
 480
 481     for (int y = 0; y < height; y++, out += rowpad)
 482     {
 483         for (int x = 0; x < width; x++, alpha++, out += 4, in += 3)
 484         {
 485             out[0] = in[0];
 486             out[1] = in[1];
 487             out[2] = in[2];
 488             out[3] = *alpha;
 489         }
 490     }
 491
 492     return true;
 493 }
 494
 495 wxImage wxBitmap::ConvertToImage() const
 496 {
 497     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 498
 499     const int w = GetWidth();
 500     const int h = GetHeight();
 501     wxImage image(w, h, false);
 502     unsigned char *data = image.GetData();
 503
 504     wxCHECK_MSG(data != NULL, wxNullImage, wxT("couldn't create image") );
 505
 506     // prefer pixbuf if available, it will preserve alpha and should be quicker
 507     if (HasPixbuf())
 508     {
 509         GdkPixbuf *pixbuf = GetPixbuf();
 510         unsigned char* alpha = NULL;
 511         if (gdk_pixbuf_get_has_alpha(pixbuf))
 512         {
 513             image.SetAlpha();
 514             alpha = image.GetAlpha();
 515         }
 516         const unsigned char* in = gdk_pixbuf_get_pixels(pixbuf);
 517         unsigned char *out = data;
 518         const int inc = 3 + int(alpha != NULL);
 519         const int rowpad = gdk_pixbuf_get_rowstride(pixbuf) - inc * w;
 520
 521         for (int y = 0; y < h; y++, in += rowpad)
 522         {
 523             for (int x = 0; x < w; x++, in += inc, out += 3)
 524             {
 525                 out[0] = in[0];
 526                 out[1] = in[1];
 527                 out[2] = in[2];
 528                 if (alpha != NULL)
 529                     *alpha++ = in[3];
 530             }
 531         }
 532     }
 533     else
 534     {
 535         GdkPixmap* pixmap = GetPixmap();
 536         GdkPixmap* pixmap_invert = NULL;
 537         if (GetDepth() == 1)
 538         {
 539             // mono bitmaps are inverted, i.e. 0 is white
 540             pixmap_invert = gdk_pixmap_new(pixmap, w, h, 1);
 541             GdkGC* gc = gdk_gc_new(pixmap_invert);
 542             gdk_gc_set_function(gc, GDK_COPY_INVERT);
 543             gdk_draw_drawable(pixmap_invert, gc, pixmap, 0, 0, 0, 0, w, h);
 544             g_object_unref(gc);
 545             pixmap = pixmap_invert;
 546         }
 547         // create a pixbuf which shares data with the wxImage
 548         GdkPixbuf* pixbuf = gdk_pixbuf_new_from_data(
 549             data, GDK_COLORSPACE_RGB, false, 8, w, h, 3 * w, NULL, NULL);
 550
 551         gdk_pixbuf_get_from_drawable(pixbuf, pixmap, NULL, 0, 0, 0, 0, w, h);
 552
 553         g_object_unref(pixbuf);
 554         if (pixmap_invert != NULL)
 555             g_object_unref(pixmap_invert);
 556     }
 557     // convert mask, unless there is already alpha
 558     if (GetMask() && !image.HasAlpha())
 559     {
 560         // we hard code the mask colour for now but we could also make an
 561         // effort (and waste time) to choose a colour not present in the
 562         // image already to avoid having to fudge the pixels below --
 563         // whether it's worth to do it is unclear however
 564         const int MASK_RED = 1;
 565         const int MASK_GREEN = 2;
 566         const int MASK_BLUE = 3;
 567         const int MASK_BLUE_REPLACEMENT = 2;
 568
 569         image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
 570         GdkImage* image_mask = gdk_drawable_get_image(GetMask()->GetBitmap(), 0, 0, w, h);
 571
 572         for (int y = 0; y < h; y++)
 573         {
 574             for (int x = 0; x < w; x++, data += 3)
 575             {
 576                 if (gdk_image_get_pixel(image_mask, x, y) == 0)
 577                 {
 578                     data[0] = MASK_RED;
 579                     data[1] = MASK_GREEN;
 580                     data[2] = MASK_BLUE;
 581                 }
 582                 else if (data[0] == MASK_RED && data[1] == MASK_GREEN && data[2] == MASK_BLUE)
 583                 {
 584                     // we have to fudge the colour a bit to prevent
 585                     // this pixel from appearing transparent
 586                     data[2] = MASK_BLUE_REPLACEMENT;
 587                 }
 588             }
 589         }
 590         g_object_unref(image_mask);
 591     }
 592
 593     return image;
 594 }
 595
 596 bool wxBitmap::IsOk() const
 597 {
 598     return (m_refData != NULL) &&
 599            (
 600               M_BMPDATA->m_pixbuf ||
 601               M_BMPDATA->m_pixmap
 602            );
 603 }
 604
 605 int wxBitmap::GetHeight() const
 606 {
 607     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 608
 609     return M_BMPDATA->m_height;
 610 }
 611
 612 int wxBitmap::GetWidth() const
 613 {
 614     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 615
 616     return M_BMPDATA->m_width;
 617 }
 618
 619 int wxBitmap::GetDepth() const
 620 {
 621     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 622
 623     return M_BMPDATA->m_bpp;
 624 }
 625
 626 wxMask *wxBitmap::GetMask() const
 627 {
 628     wxCHECK_MSG( Ok(), (wxMask *) NULL, wxT("invalid bitmap") );
 629
 630     return M_BMPDATA->m_mask;
 631 }
 632
 633 void wxBitmap::SetMask( wxMask *mask )
 634 {
 635     wxCHECK_RET( Ok(), wxT("invalid bitmap") );
 636
 637     AllocExclusive();
 638     delete M_BMPDATA->m_mask;
 639     M_BMPDATA->m_mask = mask;
 640 }
 641
 642 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
 643 {
 644     *this = icon;
 645     return Ok();
 646 }
 647
 648 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
 649 {
 650     wxBitmap ret;
 651
 652     wxCHECK_MSG(Ok(), ret, wxT("invalid bitmap"));
 653     wxCHECK_MSG(rect.x >= 0 && rect.y >= 0 &&
 654                 rect.x + rect.width <= M_BMPDATA->m_width &&
 655                 rect.y + rect.height <= M_BMPDATA->m_height,
 656                 ret, wxT("invalid bitmap region"));
 657
 658     if (HasPixbuf() || M_BMPDATA->m_bpp == 32)
 659     {
 660         GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB,
 661                                            gdk_pixbuf_get_has_alpha(GetPixbuf()),
 662                                            8, rect.width, rect.height);
 663         ret.SetPixbuf(pixbuf, M_BMPDATA->m_bpp);
 664         gdk_pixbuf_copy_area(GetPixbuf(),
 665                              rect.x, rect.y, rect.width, rect.height,
 666                              pixbuf, 0, 0);
 667     }
 668     else
 669     {
 670         ret.Create(rect.width, rect.height, M_BMPDATA->m_bpp);
 671         GdkGC *gc = gdk_gc_new( ret.GetPixmap() );
 672         gdk_draw_drawable( ret.GetPixmap(), gc, GetPixmap(), rect.x, rect.y, 0, 0, rect.width, rect.height );
 673         g_object_unref (gc);
 674     }
 675     // make mask, unless there is already alpha
 676     if (GetMask() && !HasAlpha())
 677     {
 678         wxMask *mask = new wxMask;
 679         mask->m_bitmap = gdk_pixmap_new( wxGetRootWindow()->window, rect.width, rect.height, 1 );
 680
 681         GdkGC *gc = gdk_gc_new( mask->m_bitmap );
 682         gdk_draw_drawable(mask->m_bitmap, gc, M_BMPDATA->m_mask->m_bitmap, rect.x, rect.y, 0, 0, rect.width, rect.height);
 683         g_object_unref (gc);
 684
 685         ret.SetMask( mask );
 686     }
 687
 688     return ret;
 689 }
 690
 691 bool wxBitmap::SaveFile( const wxString &name, wxBitmapType type, const wxPalette *WXUNUSED(palette) ) const
 692 {
 693     wxCHECK_MSG( Ok(), false, wxT("invalid bitmap") );
 694
 695     // Try to save the bitmap via wxImage handlers:
 696     wxImage image = ConvertToImage();
 697     return image.Ok() && image.SaveFile(name, type);
 698 }
 699
 700 bool wxBitmap::LoadFile( const wxString &name, wxBitmapType type )
 701 {
 702     UnRef();
 703
 704     if (type == wxBITMAP_TYPE_XPM)
 705     {
 706         GdkBitmap *mask = (GdkBitmap*) NULL;
 707         SetPixmap(gdk_pixmap_create_from_xpm(wxGetRootWindow()->window, &mask, NULL, name.fn_str()));
 708
 709         if (mask)
 710         {
 711             M_BMPDATA->m_mask = new wxMask;
 712             M_BMPDATA->m_mask->m_bitmap = mask;
 713         }
 714     }
 715     else // try if wxImage can load it
 716     {
 717         wxImage image;
 718         if (image.LoadFile(name, type) && image.Ok())
 719             CreateFromImage(image, -1);
 720     }
 721
 722     return Ok();
 723 }
 724
 725 #if wxUSE_PALETTE
 726 wxPalette *wxBitmap::GetPalette() const
 727 {
 728     wxCHECK_MSG(Ok(), NULL, wxT("invalid bitmap"));
 729
 730     return M_BMPDATA->m_palette;
 731 }
 732
 733 void wxBitmap::SetPalette(const wxPalette& WXUNUSED(palette))
 734 {
 735     // TODO
 736 }
 737 #endif // wxUSE_PALETTE
 738
 739 void wxBitmap::SetHeight( int height )
 740 {
 741     AllocExclusive();
 742     M_BMPDATA->m_height = height;
 743 }
 744
 745 void wxBitmap::SetWidth( int width )
 746 {
 747     AllocExclusive();
 748     M_BMPDATA->m_width = width;
 749 }
 750
 751 void wxBitmap::SetDepth( int depth )
 752 {
 753     AllocExclusive();
 754     M_BMPDATA->m_bpp = depth;
 755 }
 756
 757 void wxBitmap::SetPixmap( GdkPixmap *pixmap )
 758 {
 759     if (!m_refData)
 760         m_refData = new wxBitmapRefData;
 761
 762     // AllocExclusive should not be needed for this internal function
 763     wxASSERT(m_refData->GetRefCount() == 1);
 764     wxASSERT(M_BMPDATA->m_pixmap == NULL);
 765     M_BMPDATA->m_pixmap = pixmap;
 766     gdk_drawable_get_size(pixmap, &M_BMPDATA->m_width, &M_BMPDATA->m_height);
 767     M_BMPDATA->m_bpp = gdk_drawable_get_depth(pixmap);
 768     PurgeOtherRepresentations(Pixmap);
 769 }
 770
 771 GdkPixmap *wxBitmap::GetPixmap() const
 772 {
 773     wxCHECK_MSG( Ok(), (GdkPixmap *) NULL, wxT("invalid bitmap") );
 774
 775     // create the pixmap on the fly if we use Pixbuf representation:
 776     if (M_BMPDATA->m_pixmap == NULL)
 777     {
 778         GdkPixmap** pmask = NULL;
 779         if (gdk_pixbuf_get_has_alpha(M_BMPDATA->m_pixbuf))
 780         {
 781             // make new mask from alpha
 782             delete M_BMPDATA->m_mask;
 783             M_BMPDATA->m_mask = new wxMask;
 784             pmask = &M_BMPDATA->m_mask->m_bitmap;
 785         }
 786         gdk_pixbuf_render_pixmap_and_mask(M_BMPDATA->m_pixbuf,
 787                                           &M_BMPDATA->m_pixmap,
 788                                           pmask,
 789                                           wxIMAGE_ALPHA_THRESHOLD);
 790     }
 791
 792     return M_BMPDATA->m_pixmap;
 793 }
 794
 795 bool wxBitmap::HasPixmap() const
 796 {
 797     wxCHECK_MSG( Ok(), false, wxT("invalid bitmap") );
 798
 799     return M_BMPDATA->m_pixmap != NULL;
 800 }
 801
 802 GdkPixbuf *wxBitmap::GetPixbuf() const
 803 {
 804     wxCHECK_MSG( Ok(), NULL, wxT("invalid bitmap") );
 805
 806     if (M_BMPDATA->m_pixbuf == NULL)
 807     {
 808         int width = GetWidth();
 809         int height = GetHeight();
 810
 811         GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB,
 812                                            GetMask() != NULL,
 813                                            8, width, height);
 814         M_BMPDATA->m_pixbuf = pixbuf;
 815         gdk_pixbuf_get_from_drawable(pixbuf, M_BMPDATA->m_pixmap, NULL,
 816                                      0, 0, 0, 0, width, height);
 817
 818         // apply the mask to created pixbuf:
 819         if (M_BMPDATA->m_pixbuf && M_BMPDATA->m_mask)
 820         {
 821             GdkPixbuf *pmask =
 822                 gdk_pixbuf_get_from_drawable(NULL,
 823                                              M_BMPDATA->m_mask->GetBitmap(),
 824                                              NULL,
 825                                              0, 0, 0, 0, width, height);
 826             if (pmask)
 827             {
 828                 guchar *bmp = gdk_pixbuf_get_pixels(pixbuf);
 829                 guchar *mask = gdk_pixbuf_get_pixels(pmask);
 830                 int bmprowinc = gdk_pixbuf_get_rowstride(pixbuf) - 4 * width;
 831                 int maskrowinc = gdk_pixbuf_get_rowstride(pmask) - 3 * width;
 832
 833                 for (int y = 0; y < height;
 834                      y++, bmp += bmprowinc, mask += maskrowinc)
 835                 {
 836                     for (int x = 0; x < width; x++, bmp += 4, mask += 3)
 837                     {
 838                         if (mask[0] == 0 /*black pixel*/)
 839                             bmp[3] = 0;
 840                     }
 841                 }
 842
 843                 g_object_unref (pmask);
 844             }
 845         }
 846     }
 847
 848     return M_BMPDATA->m_pixbuf;
 849 }
 850
 851 bool wxBitmap::HasPixbuf() const
 852 {
 853     wxCHECK_MSG( Ok(), false, wxT("invalid bitmap") );
 854
 855     return M_BMPDATA->m_pixbuf != NULL;
 856 }
 857
 858 void wxBitmap::SetPixbuf(GdkPixbuf* pixbuf, int depth)
 859 {
 860     if (!m_refData)
 861         m_refData = new wxBitmapRefData;
 862
 863     // AllocExclusive should not be needed for this internal function
 864     wxASSERT(m_refData->GetRefCount() == 1);
 865     wxASSERT(M_BMPDATA->m_pixbuf == NULL);
 866     M_BMPDATA->m_pixbuf = pixbuf;
 867     M_BMPDATA->m_width = gdk_pixbuf_get_width(pixbuf);
 868     M_BMPDATA->m_height = gdk_pixbuf_get_height(pixbuf);
 869     // if depth specified
 870     if (depth != 0)
 871         M_BMPDATA->m_bpp = depth;
 872     else if (M_BMPDATA->m_bpp == 0)
 873         // use something reasonable
 874         M_BMPDATA->m_bpp = wxTheApp->GetGdkVisual()->depth;
 875     PurgeOtherRepresentations(Pixbuf);
 876 }
 877
 878 void wxBitmap::PurgeOtherRepresentations(wxBitmap::Representation keep)
 879 {
 880     if (keep == Pixmap && HasPixbuf())
 881     {
 882         g_object_unref (M_BMPDATA->m_pixbuf);
 883         M_BMPDATA->m_pixbuf = NULL;
 884     }
 885     if (keep == Pixbuf && HasPixmap())
 886     {
 887         g_object_unref (M_BMPDATA->m_pixmap);
 888         M_BMPDATA->m_pixmap = NULL;
 889     }
 890 }
 891
 892 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
 893 {
 894     void* bits = NULL;
 895     GdkPixbuf *pixbuf = GetPixbuf();
 896     const bool hasAlpha = HasAlpha();
 897     // allow access if bpp is valid and matches existence of alpha
 898     if (pixbuf != NULL && (
 899         bpp == 24 && !hasAlpha ||
 900         bpp == 32 && hasAlpha))
 901     {
 902         data.m_height = gdk_pixbuf_get_height( pixbuf );
 903         data.m_width = gdk_pixbuf_get_width( pixbuf );
 904         data.m_stride = gdk_pixbuf_get_rowstride( pixbuf );
 905         bits = gdk_pixbuf_get_pixels(pixbuf);
 906     }
 907     return bits;
 908 }
 909
 910 void wxBitmap::UngetRawData(wxPixelDataBase& WXUNUSED(data))
 911 {
 912 }
 913
 914 bool wxBitmap::HasAlpha() const
 915 {
 916     return m_refData != NULL && M_BMPDATA->m_pixbuf != NULL &&
 917         gdk_pixbuf_get_has_alpha(M_BMPDATA->m_pixbuf);
 918 }
 919
 920 wxObjectRefData* wxBitmap::CreateRefData() const
 921 {
 922     return new wxBitmapRefData;
 923 }
 924
 925 wxObjectRefData* wxBitmap::CloneRefData(const wxObjectRefData* data) const
 926 {
 927     const wxBitmapRefData* oldRef = wx_static_cast(const wxBitmapRefData*, data);
 928     wxBitmapRefData* newRef = new wxBitmapRefData;
 929     newRef->m_width = oldRef->m_width;
 930     newRef->m_height = oldRef->m_height;
 931     newRef->m_bpp = oldRef->m_bpp;
 932     if (oldRef->m_pixmap != NULL)
 933     {
 934         newRef->m_pixmap = gdk_pixmap_new(
 935             oldRef->m_pixmap, oldRef->m_width, oldRef->m_height,
 936             // use pixmap depth, m_bpp may not match
 937             gdk_drawable_get_depth(oldRef->m_pixmap));
 938         GdkGC* gc = gdk_gc_new(newRef->m_pixmap);
 939         gdk_draw_drawable(
 940             newRef->m_pixmap, gc, oldRef->m_pixmap, 0, 0, 0, 0, -1, -1);
 941         g_object_unref(gc);
 942     }
 943     if (oldRef->m_pixbuf != NULL)
 944     {
 945         newRef->m_pixbuf = gdk_pixbuf_copy(oldRef->m_pixbuf);
 946     }
 947     if (oldRef->m_mask != NULL)
 948     {
 949         newRef->m_mask = new wxMask;
 950         newRef->m_mask->m_bitmap = gdk_pixmap_new(
 951             oldRef->m_mask->m_bitmap, oldRef->m_width, oldRef->m_height, 1);
 952         GdkGC* gc = gdk_gc_new(newRef->m_mask->m_bitmap);
 953         gdk_draw_drawable(newRef->m_mask->m_bitmap,
 954             gc, oldRef->m_mask->m_bitmap, 0, 0, 0, 0, -1, -1);
 955         g_object_unref(gc);
 956     }
 957 #if wxUSE_PALETTE
 958     // implement this if SetPalette is ever implemented
 959     wxASSERT(oldRef->m_palette == NULL);
 960 #endif
 961
 962     return newRef;
 963 }
 964
 965 //-----------------------------------------------------------------------------
 966 // wxBitmapHandler
 967 //-----------------------------------------------------------------------------
 968
 969 IMPLEMENT_ABSTRACT_CLASS(wxBitmapHandler, wxBitmapHandlerBase)
 970
 971 /* static */ void wxBitmap::InitStandardHandlers()
 972 {
 973     // TODO: Insert handler based on GdkPixbufs handler later
 974 }