src/dfb/bitmap.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/dfb/bitmap.cpp
   3 // Purpose:     wxBitmap implementation
   4 // Author:      Vaclav Slavik
   5 // Created:     2006-08-04
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2006 REA Elektronik GmbH
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15     #pragma hdrstop
  16 #endif
  17
  18 #ifndef WX_PRECOMP
  19     #include "wx/app.h"
  20     #include "wx/log.h"
  21 #endif
  22
  23 #include "wx/bitmap.h"
  24 #include "wx/colour.h"
  25 #include "wx/image.h"
  26 #include "wx/rawbmp.h"
  27
  28 #include "wx/dfb/private.h"
  29
  30 //-----------------------------------------------------------------------------
  31 // helpers
  32 //-----------------------------------------------------------------------------
  33
  34 // NB: Most of this conversion code is needed because of differences between
  35 //     wxImage and wxDFB's wxBitmap representations:
  36 //     (1) wxImage uses RGB order, while DirectFB uses BGR
  37 //     (2) wxImage has alpha channel in a separate plane, while DirectFB puts
  38 //         all components into single BGRA plane
  39
  40 // pitch = stride = # of bytes between the start of N-th line and (N+1)-th line
  41 // {Src,Dst}PixSize = # of bytes used to represent one pixel
  42 template<int SrcPixSize, int DstPixSize>
  43 static void CopyPixelsAndSwapRGB(unsigned w, unsigned h,
  44                                  const unsigned char *src,
  45                                  unsigned src_pitch,
  46                                  unsigned char *dst,
  47                                  unsigned dst_pitch)
  48 {
  49     unsigned src_advance = src_pitch - SrcPixSize * w;
  50     unsigned dst_advance = dst_pitch - DstPixSize * w;
  51     for ( unsigned y = 0; y < h; y++, src += src_advance, dst += dst_advance )
  52     {
  53         for ( unsigned x = 0; x < w; x++, src += SrcPixSize, dst += DstPixSize )
  54         {
  55             // copy with RGB -> BGR translation:
  56             dst[0] = src[2];
  57             dst[1] = src[1];
  58             dst[2] = src[0];
  59         }
  60     }
  61 }
  62
  63 static void CopySurfaceToImage(const wxIDirectFBSurfacePtr& surface,
  64                                wxImage& image)
  65 {
  66     wxIDirectFBSurface::Locked locked(surface, DSLF_READ);
  67     wxCHECK_RET( locked.ptr, "failed to lock surface" );
  68
  69     const unsigned width = image.GetWidth();
  70     const unsigned height = image.GetHeight();
  71     const DFBSurfacePixelFormat format = surface->GetPixelFormat();
  72
  73     // copy RGB data from the surface:
  74     switch ( format )
  75     {
  76         case DSPF_RGB24:
  77             CopyPixelsAndSwapRGB<3,3>
  78             (
  79                 width, height,
  80                 (unsigned char*)locked.ptr, locked.pitch,
  81                 image.GetData(), width * 3
  82             );
  83             break;
  84
  85         case DSPF_RGB32:
  86         case DSPF_ARGB:
  87             CopyPixelsAndSwapRGB<4,3>
  88             (
  89                 width, height,
  90                 (unsigned char*)locked.ptr, locked.pitch,
  91                 image.GetData(), width * 3
  92             );
  93             break;
  94
  95         default:
  96             wxFAIL_MSG( "unexpected pixel format" );
  97             return;
  98     }
  99
 100     // extract alpha channel if the bitmap has it:
 101     if ( format == DSPF_ARGB )
 102     {
 103         // create alpha plane:
 104         image.SetAlpha();
 105
 106         // and copy alpha data to it:
 107         const unsigned advance = locked.pitch - 4 * width;
 108         unsigned char *alpha = image.GetAlpha();
 109         // NB: "+3" is to get pointer to alpha component
 110         const unsigned char *src = ((unsigned char*)locked.ptr) + 3;
 111
 112         for ( unsigned y = 0; y < height; y++, src += advance )
 113             for ( unsigned x = 0; x < width; x++, src += 4 )
 114                 *(alpha++) = *src;
 115     }
 116 }
 117
 118 static void CopyImageToSurface(const wxImage& image,
 119                                const wxIDirectFBSurfacePtr& surface)
 120 {
 121     wxIDirectFBSurface::Locked locked(surface, DSLF_WRITE);
 122     wxCHECK_RET( locked.ptr, "failed to lock surface" );
 123
 124     const unsigned width = image.GetWidth();
 125     const unsigned height = image.GetHeight();
 126     const DFBSurfacePixelFormat format = surface->GetPixelFormat();
 127
 128     // copy RGB data to the surface:
 129     switch ( format )
 130     {
 131         case DSPF_RGB24:
 132             CopyPixelsAndSwapRGB<3,3>
 133             (
 134                width, height,
 135                image.GetData(), width * 3,
 136                (unsigned char*)locked.ptr, locked.pitch
 137             );
 138             break;
 139
 140         case DSPF_RGB32:
 141         case DSPF_ARGB:
 142             CopyPixelsAndSwapRGB<3,4>
 143             (
 144                width, height,
 145                image.GetData(), width * 3,
 146                (unsigned char*)locked.ptr, locked.pitch
 147             );
 148             break;
 149
 150         default:
 151             wxFAIL_MSG( "unexpected pixel format" );
 152             return;
 153     }
 154
 155     // if the image has alpha channel, merge it in:
 156     if ( format == DSPF_ARGB )
 157     {
 158         wxCHECK_RET( image.HasAlpha(), "logic error - ARGB, but no alpha" );
 159
 160         const unsigned advance = locked.pitch - 4 * width;
 161         const unsigned char *alpha = image.GetAlpha();
 162         // NB: "+3" is to get pointer to alpha component
 163         unsigned char *dest = ((unsigned char*)locked.ptr) + 3;
 164
 165         for ( unsigned y = 0; y < height; y++, dest += advance )
 166             for ( unsigned x = 0; x < width; x++, dest += 4 )
 167                 *dest = *(alpha++);
 168     }
 169 }
 170
 171 static wxIDirectFBSurfacePtr
 172 CreateSurfaceWithFormat(int w, int h, DFBSurfacePixelFormat format)
 173 {
 174     DFBSurfaceDescription desc;
 175     desc.flags = (DFBSurfaceDescriptionFlags)
 176         (DSDESC_CAPS | DSDESC_WIDTH | DSDESC_HEIGHT);
 177     desc.caps = DSCAPS_NONE;
 178     desc.width = w;
 179     desc.height = h;
 180
 181     if ( format != DSPF_UNKNOWN )
 182     {
 183         desc.flags = (DFBSurfaceDescriptionFlags)(
 184                             desc.flags | DSDESC_PIXELFORMAT);
 185         desc.pixelformat = format;
 186     }
 187
 188     return wxIDirectFB::Get()->CreateSurface(&desc);
 189 }
 190
 191 // Creates a surface that will use wxImage's pixel data (RGB only)
 192 static wxIDirectFBSurfacePtr CreateSurfaceForImage(const wxImage& image)
 193 {
 194     wxCHECK_MSG( image.Ok(), NULL, "invalid image" );
 195     // FIXME_DFB: implement alpha handling by merging alpha buffer with RGB
 196     //            into a temporary RGBA surface
 197     wxCHECK_MSG( !image.HasAlpha(), NULL, "alpha channel not supported" );
 198
 199     // NB: wxImage uses RGB order of bytes while DirectFB uses BGR, so we
 200     //     cannot use preallocated surface that shares data with wxImage, we
 201     //     have to copy the data to temporary surface instead
 202     return CreateSurfaceWithFormat(image.GetWidth(), image.GetHeight(),
 203                                    DSPF_RGB24);
 204 }
 205
 206 static bool ConvertSurfaceToFormat(wxIDirectFBSurfacePtr& surface,
 207                                    DFBSurfacePixelFormat format)
 208 {
 209     if ( surface->GetPixelFormat() == format )
 210         return true;
 211
 212     int w, h;
 213     surface->GetSize(&w, &h);
 214     wxIDirectFBSurfacePtr s = CreateSurfaceWithFormat(w, h, format);
 215     if ( !s )
 216         return false;
 217
 218     if ( !s->SetBlittingFlags(DSBLIT_NOFX) )
 219         return false;
 220     if ( !s->Blit(surface->GetRaw(), NULL, 0, 0) )
 221         return false;
 222
 223     surface = s;
 224     return true;
 225 }
 226
 227 static DFBSurfacePixelFormat DepthToFormat(int depth)
 228 {
 229     switch ( depth )
 230     {
 231         case 24:
 232             return DSPF_RGB24;
 233         case 32:
 234             // NB: we treat depth=32 as requesting ARGB for consistency with
 235             //     other ports
 236             return DSPF_ARGB;
 237         default:
 238             wxFAIL_MSG( "unsupported depth requested" );
 239             // fall through
 240         case -1:
 241             return DSPF_UNKNOWN;
 242     }
 243 }
 244
 245 //-----------------------------------------------------------------------------
 246 // wxBitmapRefData
 247 //-----------------------------------------------------------------------------
 248
 249 class wxBitmapRefData: public wxGDIRefData
 250 {
 251 public:
 252     wxBitmapRefData()
 253     {
 254         m_mask = NULL;
 255 #if wxUSE_PALETTE
 256         m_palette = NULL;
 257 #endif
 258     }
 259
 260     wxBitmapRefData(const wxBitmapRefData& data)
 261     {
 262         m_surface = data.m_surface ? data.m_surface->Clone() : NULL;
 263
 264         m_mask = data.m_mask ? new wxMask(*data.m_mask) : NULL;
 265 #if wxUSE_PALETTE
 266         m_palette = data.m_palette ? new wxPalette(*data.m_palette) : NULL;
 267 #endif
 268     }
 269
 270     virtual ~wxBitmapRefData()
 271     {
 272         delete m_mask;
 273 #if wxUSE_PALETTE
 274         delete m_palette;
 275 #endif
 276     }
 277
 278     virtual bool IsOk() const { return m_surface; }
 279
 280     wxIDirectFBSurfacePtr m_surface;
 281     wxMask               *m_mask;
 282 #if wxUSE_PALETTE
 283     wxPalette            *m_palette;
 284 #endif
 285 };
 286
 287 #define M_BITMAP ((wxBitmapRefData *)m_refData)
 288
 289 //-----------------------------------------------------------------------------
 290 // wxBitmap
 291 //-----------------------------------------------------------------------------
 292
 293 IMPLEMENT_ABSTRACT_CLASS(wxBitmapHandler, wxBitmapHandlerBase)
 294 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxBitmapBase)
 295
 296 wxBitmap::wxBitmap(int width, int height, int depth)
 297 {
 298     Create(width, height, depth);
 299 }
 300
 301 bool wxBitmap::Create(const wxIDirectFBSurfacePtr& surface)
 302 {
 303     UnRef();
 304
 305     wxCHECK_MSG( surface, false, "invalid surface" );
 306
 307     m_refData = new wxBitmapRefData();
 308     M_BITMAP->m_surface = surface;
 309     return true;
 310 }
 311
 312 bool wxBitmap::Create(int width, int height, int depth)
 313 {
 314     return CreateWithFormat(width, height, DepthToFormat(depth));
 315 }
 316
 317 bool wxBitmap::CreateWithFormat(int width, int height, int dfbFormat)
 318 {
 319     UnRef();
 320
 321     wxCHECK_MSG( width > 0 && height > 0, false, wxT("invalid bitmap size") );
 322
 323     return Create(CreateSurfaceWithFormat(width, height,
 324                                           DFBSurfacePixelFormat(dfbFormat)));
 325 }
 326
 327 #if wxUSE_IMAGE
 328 wxBitmap::wxBitmap(const wxImage& image, int depth)
 329 {
 330     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 331
 332     DFBSurfacePixelFormat format = DepthToFormat(depth);
 333     if ( format == DSPF_UNKNOWN && image.HasAlpha() )
 334         format = DSPF_ARGB;
 335
 336     // create surface in screen's format (unless we need alpha channel,
 337     // in which case use ARGB):
 338     if ( !CreateWithFormat(image.GetWidth(), image.GetHeight(), format) )
 339         return;
 340
 341     // then copy the image to it:
 342     wxIDirectFBSurfacePtr dst = M_BITMAP->m_surface;
 343
 344     switch ( dst->GetPixelFormat() )
 345     {
 346         case DSPF_RGB24:
 347         case DSPF_RGB32:
 348         case DSPF_ARGB:
 349             CopyImageToSurface(image, dst);
 350             break;
 351
 352         default:
 353         {
 354             // wxBitmap uses different pixel format, so we have to use a
 355             // temporary surface and blit to the bitmap via it:
 356             wxIDirectFBSurfacePtr src(CreateSurfaceForImage(image));
 357             CopyImageToSurface(image, src);
 358
 359             if ( !dst->SetBlittingFlags(DSBLIT_NOFX) )
 360                 return;
 361             if ( !dst->Blit(src->GetRaw(), NULL, 0, 0) )
 362                 return;
 363         }
 364     }
 365
 366     // FIXME: implement mask creation from image's mask (or alpha channel?)
 367     wxASSERT_MSG( !image.HasMask(), "image masks are ignored for now" );
 368 }
 369
 370 wxImage wxBitmap::ConvertToImage() const
 371 {
 372     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 373
 374     wxImage img(GetWidth(), GetHeight());
 375     wxIDirectFBSurfacePtr src = M_BITMAP->m_surface;
 376
 377     switch ( src->GetPixelFormat() )
 378     {
 379         case DSPF_RGB24:
 380         case DSPF_RGB32:
 381         case DSPF_ARGB:
 382             CopySurfaceToImage(src, img);
 383             break;
 384         default:
 385         {
 386             // wxBitmap uses different pixel format, so we have to use a
 387             // temporary surface and blit to the bitmap via it:
 388             wxIDirectFBSurfacePtr dst(CreateSurfaceForImage(img));
 389
 390             if ( !dst->SetBlittingFlags(DSBLIT_NOFX) )
 391                 return wxNullImage;
 392             if ( !dst->Blit(src->GetRaw(), NULL, 0, 0) )
 393                 return wxNullImage;
 394
 395             CopySurfaceToImage(dst, img);
 396         }
 397     }
 398
 399     // FIXME: implement mask setting in the image
 400     wxASSERT_MSG( GetMask() == NULL, "bitmap masks are ignored for now" );
 401
 402     return img;
 403 }
 404 #endif // wxUSE_IMAGE
 405
 406 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
 407 {
 408     wxCHECK_MSG( Ok(), NULL, "invalid bitmap" );
 409
 410     AllocExclusive();
 411
 412     DFBSurfacePixelFormat format;
 413     if ( bpp == 32 )
 414         format = DSPF_ARGB;
 415     else
 416         format = DSPF_RGB24;
 417
 418     // convert the bitmap into format compatible with requested raw access;
 419     // note that we don't bother converting the bitmap back in UngetRawData(),
 420     // as unpacked formats (RGB24, RGB32) are the common case and converting
 421     // between them while blitting is fast enough (FIXME?)
 422     if ( !ConvertSurfaceToFormat(M_BITMAP->m_surface, format) )
 423         return NULL;
 424
 425     void *bits = NULL;
 426     if ( !M_BITMAP->m_surface->Lock
 427                                (
 428                                  (DFBSurfaceLockFlags)(DSLF_READ | DSLF_WRITE),
 429                                  &bits,
 430                                  &data.m_stride
 431                                ) )
 432         return NULL;
 433
 434     M_BITMAP->m_surface->GetSize(&data.m_width, &data.m_height);
 435
 436     return bits;
 437 }
 438
 439 void wxBitmap::UngetRawData(wxPixelDataBase& WXUNUSED(data))
 440 {
 441     M_BITMAP->m_surface->Unlock();
 442 }
 443
 444 bool wxBitmap::HasAlpha() const
 445 {
 446     wxCHECK_MSG( Ok(), false, "invalid bitmap" );
 447
 448     return M_BITMAP->m_surface->GetPixelFormat() == DSPF_ARGB;
 449 }
 450
 451 wxBitmap::wxBitmap(const wxString &filename, wxBitmapType type)
 452 {
 453     LoadFile(filename, type);
 454 }
 455
 456 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 457 {
 458     wxCHECK_RET( depth == 1, wxT("can only create mono bitmap from XBM data") );
 459
 460     wxFAIL_MSG( "not implemented" );
 461 }
 462
 463 int wxBitmap::GetHeight() const
 464 {
 465     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 466
 467     int h = -1;
 468     M_BITMAP->m_surface->GetSize(NULL, &h);
 469     return h;
 470 }
 471
 472 int wxBitmap::GetWidth() const
 473 {
 474     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 475
 476     int w = -1;
 477     M_BITMAP->m_surface->GetSize(&w, NULL);
 478     return w;
 479 }
 480
 481 int wxBitmap::GetDepth() const
 482 {
 483     wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );
 484
 485     return M_BITMAP->m_surface->GetDepth();
 486 }
 487
 488 wxMask *wxBitmap::GetMask() const
 489 {
 490     wxCHECK_MSG( Ok(), NULL, wxT("invalid bitmap") );
 491
 492     return M_BITMAP->m_mask;
 493 }
 494
 495 void wxBitmap::SetMask(wxMask *mask)
 496 {
 497     wxCHECK_RET( Ok(), wxT("invalid bitmap") );
 498
 499     AllocExclusive();
 500     delete M_BITMAP->m_mask;
 501     M_BITMAP->m_mask = mask;
 502 }
 503
 504 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
 505 {
 506     *this = *((wxBitmap*)(&icon));
 507     return true;
 508 }
 509
 510 wxBitmap wxBitmap::GetSubBitmap(const wxRect& rect) const
 511 {
 512     wxCHECK_MSG( Ok() &&
 513                  rect.x >= 0 && rect.y >= 0 &&
 514                  rect.x+rect.width <= GetWidth() &&
 515                  rect.y+rect.height <= GetHeight(),
 516                  wxNullBitmap,
 517                  wxT("invalid bitmap or bitmap region") );
 518
 519     // NB: DirectFB subsurfaces share the same pixels buffer, so we must
 520     //     clone the obtained subsurface
 521     DFBRectangle r = { rect.x, rect.y, rect.width, rect.height };
 522     return wxBitmap(M_BITMAP->m_surface->GetSubSurface(&r)->Clone());
 523 }
 524
 525 #warning "to common code"
 526 bool wxBitmap::LoadFile(const wxString &name, wxBitmapType type)
 527 {
 528     UnRef();
 529
 530     wxBitmapHandler *handler = FindHandler(type);
 531
 532     if ( handler == NULL )
 533     {
 534         wxImage image;
 535         if ( !image.LoadFile(name, type) || !image.Ok() )
 536         {
 537             wxLogError(_("No bitmap handler for type %d defined."), type);
 538             return false;
 539         }
 540         else
 541         {
 542             *this = wxBitmap(image);
 543             return true;
 544         }
 545     }
 546
 547     m_refData = new wxBitmapRefData();
 548
 549     return handler->LoadFile(this, name, type, -1, -1);
 550 }
 551
 552 #warning "to common code"
 553 bool wxBitmap::SaveFile(const wxString& filename, wxBitmapType type, const wxPalette *palette) const
 554 {
 555     wxCHECK_MSG( Ok(), false, wxT("invalid bitmap") );
 556
 557     wxBitmapHandler *handler = FindHandler(type);
 558
 559     if ( handler == NULL )
 560     {
 561         wxImage image = ConvertToImage();
 562 #if wxUSE_PALETTE
 563         if ( palette )
 564             image.SetPalette(*palette);
 565 #endif // wxUSE_PALETTE
 566
 567         if ( image.Ok() )
 568             return image.SaveFile(filename, type);
 569         else
 570         {
 571             wxLogError(_("No bitmap handler for type %d defined."), type);
 572             return false;
 573         }
 574     }
 575
 576     return handler->SaveFile(this, filename, type, palette);
 577 }
 578
 579 #if wxUSE_PALETTE
 580 wxPalette *wxBitmap::GetPalette() const
 581 {
 582     wxCHECK_MSG( Ok(), NULL, wxT("invalid bitmap") );
 583
 584     return M_BITMAP->m_palette;
 585 }
 586
 587 void wxBitmap::SetPalette(const wxPalette& palette)
 588 {
 589     wxCHECK_RET( Ok(), wxT("invalid bitmap") );
 590     wxCHECK_RET( GetDepth() > 1 && GetDepth() <= 8, wxT("cannot set palette for bitmap of this depth") );
 591
 592     AllocExclusive();
 593     delete M_BITMAP->m_palette;
 594     M_BITMAP->m_palette = NULL;
 595
 596     if ( !palette.Ok() ) return;
 597
 598     M_BITMAP->m_palette = new wxPalette(palette);
 599 }
 600 #endif // wxUSE_PALETTE
 601
 602 void wxBitmap::SetHeight(int height)
 603 {
 604     AllocExclusive();
 605
 606     wxFAIL_MSG( "SetHeight not implemented" );
 607 }
 608
 609 void wxBitmap::SetWidth(int width)
 610 {
 611     AllocExclusive();
 612
 613     wxFAIL_MSG( "SetWidth not implemented" );
 614 }
 615
 616 void wxBitmap::SetDepth(int depth)
 617 {
 618     DFBSurfacePixelFormat format = DepthToFormat(depth);
 619     if ( M_BITMAP->m_surface->GetPixelFormat() == format )
 620         return;
 621
 622     AllocExclusive();
 623
 624     int w, h;
 625     M_BITMAP->m_surface->GetSize(&w, &h);
 626     wxIDirectFBSurfacePtr s = CreateSurfaceWithFormat(w, h, format);
 627     if ( !s )
 628         return;
 629     if ( !s->SetBlittingFlags(DSBLIT_NOFX) )
 630         return;
 631     if ( !s->Blit(M_BITMAP->m_surface->GetRaw(), NULL, 0, 0) )
 632         return;
 633
 634     M_BITMAP->m_surface = s;
 635 }
 636
 637 wxIDirectFBSurfacePtr wxBitmap::GetDirectFBSurface() const
 638 {
 639     wxCHECK_MSG( Ok(), NULL, wxT("invalid bitmap") );
 640
 641     return M_BITMAP->m_surface;
 642 }
 643
 644 wxGDIRefData *wxBitmap::CreateGDIRefData() const
 645 {
 646     return new wxBitmapRefData;
 647 }
 648
 649 wxGDIRefData *wxBitmap::CloneGDIRefData(const wxGDIRefData *data) const
 650 {
 651     return new wxBitmapRefData(*(wxBitmapRefData *)data);
 652 }
 653
 654
 655 /*static*/
 656 void wxBitmap::InitStandardHandlers()
 657 {
 658     // not wxBitmap handlers, we rely on wxImage
 659 }