src/msw/gdiimage.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/gdiimage.cpp
   3 // Purpose:     wxGDIImage implementation
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     20.11.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1999 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "gdiimage.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/string.h"
  33     #include "wx/log.h"
  34 #endif // WX_PRECOMP
  35
  36 #include "wx/msw/private.h"
  37
  38 #include "wx/app.h"
  39
  40 #include "wx/bitmap.h"
  41 #include "wx/msw/gdiimage.h"
  42 #include "wx/msw/dib.h"
  43
  44 #include "wx/listimpl.cpp"
  45 WX_DEFINE_LIST(wxGDIImageHandlerList);
  46
  47 // ----------------------------------------------------------------------------
  48 // private classes
  49 // ----------------------------------------------------------------------------
  50
  51 #ifndef __WXMICROWIN__
  52
  53 // all image handlers are declared/defined in this file because the outside
  54 // world doesn't have to know about them (but only about wxBITMAP_TYPE_XXX ids)
  55
  56 class WXDLLEXPORT wxBMPFileHandler : public wxBitmapHandler
  57 {
  58 public:
  59     wxBMPFileHandler() : wxBitmapHandler(_T("Windows bitmap file"), _T("bmp"),
  60                                          wxBITMAP_TYPE_BMP)
  61     {
  62     }
  63
  64     virtual bool LoadFile(wxBitmap *bitmap,
  65                           const wxString& name, long flags,
  66                           int desiredWidth, int desiredHeight);
  67     virtual bool SaveFile(wxBitmap *bitmap,
  68                           const wxString& name, int type,
  69                           const wxPalette *palette = NULL);
  70
  71 private:
  72     DECLARE_DYNAMIC_CLASS(wxBMPFileHandler)
  73 };
  74
  75 class WXDLLEXPORT wxBMPResourceHandler: public wxBitmapHandler
  76 {
  77 public:
  78     wxBMPResourceHandler() : wxBitmapHandler(_T("Windows bitmap resource"),
  79                                              wxEmptyString,
  80                                              wxBITMAP_TYPE_BMP_RESOURCE)
  81     {
  82     }
  83
  84     virtual bool LoadFile(wxBitmap *bitmap,
  85                           const wxString& name, long flags,
  86                           int desiredWidth, int desiredHeight);
  87
  88 private:
  89     DECLARE_DYNAMIC_CLASS(wxBMPResourceHandler)
  90 };
  91
  92 class WXDLLEXPORT wxIconHandler : public wxGDIImageHandler
  93 {
  94 public:
  95     wxIconHandler(const wxString& name, const wxString& ext, long type)
  96         : wxGDIImageHandler(name, ext, type)
  97     {
  98     }
  99
 100     // creating and saving icons is not supported
 101     virtual bool Create(wxGDIImage *WXUNUSED(image),
 102                         void *WXUNUSED(data),
 103                         long WXUNUSED(flags),
 104                         int WXUNUSED(width),
 105                         int WXUNUSED(height),
 106                         int WXUNUSED(depth) = 1)
 107     {
 108         return false;
 109     }
 110
 111     virtual bool Save(wxGDIImage *WXUNUSED(image),
 112                       const wxString& WXUNUSED(name),
 113                       int WXUNUSED(type))
 114     {
 115         return false;
 116     }
 117
 118     virtual bool Load(wxGDIImage *image,
 119                       const wxString& name,
 120                       long flags,
 121                       int desiredWidth, int desiredHeight)
 122     {
 123         wxIcon *icon = wxDynamicCast(image, wxIcon);
 124         wxCHECK_MSG( icon, false, _T("wxIconHandler only works with icons") );
 125
 126         return LoadIcon(icon, name, flags, desiredWidth, desiredHeight);
 127     }
 128
 129 protected:
 130     virtual bool LoadIcon(wxIcon *icon,
 131                           const wxString& name, long flags,
 132                           int desiredWidth = -1, int desiredHeight = -1) = 0;
 133 };
 134
 135 class WXDLLEXPORT wxICOFileHandler : public wxIconHandler
 136 {
 137 public:
 138     wxICOFileHandler() : wxIconHandler(_T("ICO icon file"),
 139                                        _T("ico"),
 140                                        wxBITMAP_TYPE_ICO)
 141     {
 142     }
 143
 144     virtual bool LoadIcon(wxIcon *icon,
 145                           const wxString& name, long flags,
 146                           int desiredWidth = -1, int desiredHeight = -1);
 147
 148 private:
 149     DECLARE_DYNAMIC_CLASS(wxICOFileHandler)
 150 };
 151
 152 class WXDLLEXPORT wxICOResourceHandler: public wxIconHandler
 153 {
 154 public:
 155     wxICOResourceHandler() : wxIconHandler(_T("ICO resource"),
 156                                            _T("ico"),
 157                                            wxBITMAP_TYPE_ICO_RESOURCE)
 158     {
 159     }
 160
 161     virtual bool LoadIcon(wxIcon *icon,
 162                           const wxString& name, long flags,
 163                           int desiredWidth = -1, int desiredHeight = -1);
 164
 165 private:
 166     DECLARE_DYNAMIC_CLASS(wxICOResourceHandler)
 167 };
 168
 169 // ----------------------------------------------------------------------------
 170 // wxWin macros
 171 // ----------------------------------------------------------------------------
 172
 173 IMPLEMENT_DYNAMIC_CLASS(wxBMPFileHandler, wxBitmapHandler)
 174 IMPLEMENT_DYNAMIC_CLASS(wxBMPResourceHandler, wxBitmapHandler)
 175 IMPLEMENT_DYNAMIC_CLASS(wxICOFileHandler, wxObject)
 176 IMPLEMENT_DYNAMIC_CLASS(wxICOResourceHandler, wxObject)
 177
 178 // ----------------------------------------------------------------------------
 179 // private functions
 180 // ----------------------------------------------------------------------------
 181
 182 #endif
 183     // __MICROWIN__
 184
 185 // ============================================================================
 186 // implementation
 187 // ============================================================================
 188
 189 wxGDIImageHandlerList wxGDIImage::ms_handlers;
 190
 191 // ----------------------------------------------------------------------------
 192 // wxGDIImage functions forwarded to wxGDIImageRefData
 193 // ----------------------------------------------------------------------------
 194
 195 bool wxGDIImage::FreeResource(bool WXUNUSED(force))
 196 {
 197     if ( !IsNull() )
 198     {
 199         GetGDIImageData()->Free();
 200         GetGDIImageData()->m_handle = 0;
 201     }
 202
 203     return true;
 204 }
 205
 206 WXHANDLE wxGDIImage::GetResourceHandle() const
 207 {
 208     return GetHandle();
 209 }
 210
 211 // ----------------------------------------------------------------------------
 212 // wxGDIImage handler stuff
 213 // ----------------------------------------------------------------------------
 214
 215 void wxGDIImage::AddHandler(wxGDIImageHandler *handler)
 216 {
 217     ms_handlers.Append(handler);
 218 }
 219
 220 void wxGDIImage::InsertHandler(wxGDIImageHandler *handler)
 221 {
 222     ms_handlers.Insert(handler);
 223 }
 224
 225 bool wxGDIImage::RemoveHandler(const wxString& name)
 226 {
 227     wxGDIImageHandler *handler = FindHandler(name);
 228     if ( handler )
 229     {
 230         ms_handlers.DeleteObject(handler);
 231         return true;
 232     }
 233     else
 234         return false;
 235 }
 236
 237 wxGDIImageHandler *wxGDIImage::FindHandler(const wxString& name)
 238 {
 239     wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
 240     while ( node )
 241     {
 242         wxGDIImageHandler *handler = node->GetData();
 243         if ( handler->GetName() == name )
 244             return handler;
 245         node = node->GetNext();
 246     }
 247
 248     return NULL;
 249 }
 250
 251 wxGDIImageHandler *wxGDIImage::FindHandler(const wxString& extension,
 252                                            long type)
 253 {
 254     wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
 255     while ( node )
 256     {
 257         wxGDIImageHandler *handler = node->GetData();
 258         if ( (handler->GetExtension() = extension) &&
 259              (type == -1 || handler->GetType() == type) )
 260         {
 261             return handler;
 262         }
 263
 264         node = node->GetNext();
 265     }
 266     return NULL;
 267 }
 268
 269 wxGDIImageHandler *wxGDIImage::FindHandler(long type)
 270 {
 271     wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
 272     while ( node )
 273     {
 274         wxGDIImageHandler *handler = node->GetData();
 275         if ( handler->GetType() == type )
 276             return handler;
 277
 278         node = node->GetNext();
 279     }
 280
 281     return NULL;
 282 }
 283
 284 void wxGDIImage::CleanUpHandlers()
 285 {
 286     wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
 287     while ( node )
 288     {
 289         wxGDIImageHandler *handler = node->GetData();
 290         wxGDIImageHandlerList::compatibility_iterator next = node->GetNext();
 291         delete handler;
 292         ms_handlers.Erase( node );
 293         node = next;
 294     }
 295 }
 296
 297 void wxGDIImage::InitStandardHandlers()
 298 {
 299 #ifndef __WXMICROWIN__
 300     AddHandler(new wxBMPResourceHandler);
 301     AddHandler(new wxBMPFileHandler);
 302     AddHandler(new wxICOResourceHandler);
 303     AddHandler(new wxICOFileHandler);
 304 #endif
 305 }
 306
 307 #ifndef __WXMICROWIN__
 308
 309 // ----------------------------------------------------------------------------
 310 // wxBitmap handlers
 311 // ----------------------------------------------------------------------------
 312
 313 bool wxBMPResourceHandler::LoadFile(wxBitmap *bitmap,
 314                                     const wxString& name, long WXUNUSED(flags),
 315                                     int WXUNUSED(desiredWidth),
 316                                     int WXUNUSED(desiredHeight))
 317 {
 318     // TODO: load colourmap.
 319     bitmap->SetHBITMAP((WXHBITMAP)::LoadBitmap(wxGetInstance(), name));
 320
 321     if ( !bitmap->Ok() )
 322     {
 323         // it's probably not found
 324         wxLogError(wxT("Can't load bitmap '%s' from resources! Check .rc file."),
 325                    name.c_str());
 326
 327         return false;
 328     }
 329
 330     BITMAP bm;
 331     if ( !::GetObject(GetHbitmapOf(*bitmap), sizeof(BITMAP), (LPSTR) &bm) )
 332     {
 333         wxLogLastError(wxT("GetObject(HBITMAP)"));
 334     }
 335
 336     bitmap->SetWidth(bm.bmWidth);
 337     bitmap->SetHeight(bm.bmHeight);
 338     bitmap->SetDepth(bm.bmBitsPixel);
 339
 340     return true;
 341 }
 342
 343 bool wxBMPFileHandler::LoadFile(wxBitmap *bitmap,
 344                                 const wxString& name, long WXUNUSED(flags),
 345                                 int WXUNUSED(desiredWidth),
 346                                 int WXUNUSED(desiredHeight))
 347 {
 348     wxCHECK_MSG( bitmap, false, _T("NULL bitmap in LoadFile") );
 349
 350     wxDIB dib(name);
 351
 352     return dib.IsOk() && bitmap->CopyFromDIB(dib);
 353 }
 354
 355 bool wxBMPFileHandler::SaveFile(wxBitmap *bitmap,
 356                                 const wxString& name,
 357                                 int WXUNUSED(type),
 358                                 const wxPalette * WXUNUSED(pal))
 359 {
 360     wxCHECK_MSG( bitmap, false, _T("NULL bitmap in SaveFile") );
 361
 362     wxDIB dib(*bitmap);
 363
 364     return dib.Save(name);
 365 }
 366
 367 // ----------------------------------------------------------------------------
 368 // wxIcon handlers
 369 // ----------------------------------------------------------------------------
 370
 371 bool wxICOFileHandler::LoadIcon(wxIcon *icon,
 372                                 const wxString& name,
 373                                 long WXUNUSED(flags),
 374                                 int desiredWidth, int desiredHeight)
 375 {
 376     icon->UnRef();
 377
 378     // actual size
 379     wxSize size;
 380
 381     HICON hicon = NULL;
 382
 383     // Parse the filename: it may be of the form "filename;n" in order to
 384     // specify the nth icon in the file.
 385     //
 386     // For the moment, ignore the issue of possible semicolons in the
 387     // filename.
 388     int iconIndex = 0;
 389     wxString nameReal(name);
 390     wxString strIconIndex = name.AfterLast(wxT(';'));
 391     if (strIconIndex != name)
 392     {
 393         iconIndex = wxAtoi(strIconIndex);
 394         nameReal = name.BeforeLast(wxT(';'));
 395     }
 396
 397 #if 0
 398     // If we don't know what size icon we're looking for,
 399     // try to find out what's there.
 400     // Unfortunately this doesn't work, because ExtractIconEx
 401     // will scale the icon to the 'desired' size, even if that
 402     // size of icon isn't explicitly stored. So we would have
 403     // to parse the icon file outselves.
 404     if ( desiredWidth == -1 &&
 405          desiredHeight == -1)
 406     {
 407         // Try loading a large icon first
 408         if ( ::ExtractIconEx(nameReal, iconIndex, &hicon, NULL, 1) == 1)
 409         {
 410         }
 411         // Then try loading a small icon
 412         else if ( ::ExtractIconEx(nameReal, iconIndex, NULL, &hicon, 1) == 1)
 413         {
 414         }
 415     }
 416     else
 417 #endif
 418     // were we asked for a large icon?
 419     if ( desiredWidth == ::GetSystemMetrics(SM_CXICON) &&
 420          desiredHeight == ::GetSystemMetrics(SM_CYICON) )
 421     {
 422         // get the specified large icon from file
 423         if ( !::ExtractIconEx(nameReal, iconIndex, &hicon, NULL, 1) )
 424         {
 425             // it is not an error, but it might still be useful to be informed
 426             // about it optionally
 427             wxLogTrace(_T("iconload"),
 428                        _T("No large icons found in the file '%s'."),
 429                        name.c_str());
 430         }
 431     }
 432     else if ( desiredWidth == ::GetSystemMetrics(SM_CXSMICON) &&
 433               desiredHeight == ::GetSystemMetrics(SM_CYSMICON) )
 434     {
 435         // get the specified small icon from file
 436         if ( !::ExtractIconEx(nameReal, iconIndex, NULL, &hicon, 1) )
 437         {
 438             wxLogTrace(_T("iconload"),
 439                        _T("No small icons found in the file '%s'."),
 440                        name.c_str());
 441         }
 442     }
 443     //else: not standard size, load below
 444
 445     if ( !hicon )
 446     {
 447         // take any size icon from the file by index
 448         hicon = ::ExtractIcon(wxGetInstance(), nameReal, iconIndex);
 449     }
 450
 451     if ( !hicon )
 452     {
 453         wxLogSysError(_T("Failed to load icon from the file '%s'"),
 454                       name.c_str());
 455
 456         return false;
 457     }
 458
 459     size = wxGetHiconSize(hicon);
 460
 461     if ( (desiredWidth != -1 && desiredWidth != size.x) ||
 462          (desiredHeight != -1 && desiredHeight != size.y) )
 463     {
 464         wxLogTrace(_T("iconload"),
 465                    _T("Returning false from wxICOFileHandler::Load because of the size mismatch: actual (%d, %d), requested (%d, %d)"),
 466                    size.x, size.y,
 467                    desiredWidth, desiredHeight);
 468
 469         ::DestroyIcon(hicon);
 470
 471         return false;
 472     }
 473
 474     icon->SetHICON((WXHICON)hicon);
 475     icon->SetSize(size.x, size.y);
 476
 477     return icon->Ok();
 478 }
 479
 480 bool wxICOResourceHandler::LoadIcon(wxIcon *icon,
 481                                     const wxString& name,
 482                                     long WXUNUSED(flags),
 483                                     int desiredWidth, int desiredHeight)
 484 {
 485     HICON hicon;
 486
 487     // do we need the icon of the specific size or would any icon do?
 488     bool hasSize = desiredWidth != -1 || desiredHeight != -1;
 489
 490     wxASSERT_MSG( !hasSize || (desiredWidth != -1 && desiredHeight != -1),
 491                   _T("width and height should be either both -1 or not") );
 492
 493     // try to load the icon from this program first to allow overriding the
 494     // standard icons (although why one would want to do it considering that
 495     // we already have wxApp::GetStdIcon() is unclear)
 496
 497     // note that we can't just always call LoadImage() because it seems to do
 498     // some icon rescaling internally which results in very ugly 16x16 icons
 499     if ( hasSize )
 500     {
 501         hicon = (HICON)::LoadImage(wxGetInstance(), name, IMAGE_ICON,
 502                                     desiredWidth, desiredHeight,
 503                                     LR_DEFAULTCOLOR);
 504     }
 505     else
 506     {
 507         hicon = ::LoadIcon(wxGetInstance(), name);
 508     }
 509
 510     // next check if it's not a standard icon
 511     if ( !hicon && !hasSize )
 512     {
 513         static const struct
 514         {
 515             const wxChar *name;
 516             LPTSTR id;
 517         } stdIcons[] =
 518         {
 519             { wxT("wxICON_QUESTION"),   IDI_QUESTION    },
 520             { wxT("wxICON_WARNING"),    IDI_EXCLAMATION },
 521             { wxT("wxICON_ERROR"),      IDI_HAND        },
 522             { wxT("wxICON_INFORMATION"),       IDI_ASTERISK    },
 523         };
 524
 525         for ( size_t nIcon = 0; !hicon && nIcon < WXSIZEOF(stdIcons); nIcon++ )
 526         {
 527             if ( name == stdIcons[nIcon].name )
 528             {
 529                 hicon = ::LoadIcon((HINSTANCE)NULL, stdIcons[nIcon].id);
 530             }
 531         }
 532     }
 533
 534     wxSize size = wxGetHiconSize(hicon);
 535     icon->SetSize(size.x, size.y);
 536
 537     icon->SetHICON((WXHICON)hicon);
 538
 539     return icon->Ok();
 540 }
 541
 542 // ----------------------------------------------------------------------------
 543 // private functions
 544 // ----------------------------------------------------------------------------
 545
 546 wxSize wxGetHiconSize(HICON hicon)
 547 {
 548     wxSize size(32, 32);    // default
 549
 550     if ( hicon && wxGetOsVersion() != wxWIN32S )
 551     {
 552         ICONINFO info;
 553         if ( !::GetIconInfo(hicon, &info) )
 554         {
 555             wxLogLastError(wxT("GetIconInfo"));
 556         }
 557         else
 558         {
 559             HBITMAP hbmp = info.hbmMask;
 560             if ( hbmp )
 561             {
 562                 BITMAP bm;
 563                 if ( ::GetObject(hbmp, sizeof(BITMAP), (LPSTR) &bm) )
 564                 {
 565                     size = wxSize(bm.bmWidth, bm.bmHeight);
 566                 }
 567
 568                 ::DeleteObject(info.hbmMask);
 569             }
 570             if ( info.hbmColor )
 571                 ::DeleteObject(info.hbmColor);
 572         }
 573     }
 574
 575     return size;
 576 }
 577
 578 #endif // __WXMICROWIN__
 579