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 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/string.h"
  29     #include "wx/log.h"
  30 #endif // WX_PRECOMP
  31
  32 #include "wx/msw/private.h"
  33
  34 #include "wx/app.h"
  35
  36 #include "wx/bitmap.h"
  37 #include "wx/msw/gdiimage.h"
  38
  39 #if wxUSE_WXDIB
  40 #include "wx/msw/dib.h"
  41 #endif
  42
  43 #ifdef __WXWINCE__
  44 #include <winreg.h>
  45 #include <shellapi.h>
  46 #endif
  47
  48 #include "wx/file.h"
  49
  50 #include "wx/listimpl.cpp"
  51 WX_DEFINE_LIST(wxGDIImageHandlerList);
  52
  53 // ----------------------------------------------------------------------------
  54 // private classes
  55 // ----------------------------------------------------------------------------
  56
  57 #ifndef __WXMICROWIN__
  58
  59 // all image handlers are declared/defined in this file because the outside
  60 // world doesn't have to know about them (but only about wxBITMAP_TYPE_XXX ids)
  61
  62 class WXDLLEXPORT wxBMPFileHandler : public wxBitmapHandler
  63 {
  64 public:
  65     wxBMPFileHandler() : wxBitmapHandler(_T("Windows bitmap file"), _T("bmp"),
  66                                          wxBITMAP_TYPE_BMP)
  67     {
  68     }
  69
  70     virtual bool LoadFile(wxBitmap *bitmap,
  71                           const wxString& name, long flags,
  72                           int desiredWidth, int desiredHeight);
  73     virtual bool SaveFile(wxBitmap *bitmap,
  74                           const wxString& name, int type,
  75                           const wxPalette *palette = NULL);
  76
  77 private:
  78     DECLARE_DYNAMIC_CLASS(wxBMPFileHandler)
  79 };
  80
  81 class WXDLLEXPORT wxBMPResourceHandler: public wxBitmapHandler
  82 {
  83 public:
  84     wxBMPResourceHandler() : wxBitmapHandler(_T("Windows bitmap resource"),
  85                                              wxEmptyString,
  86                                              wxBITMAP_TYPE_BMP_RESOURCE)
  87     {
  88     }
  89
  90     virtual bool LoadFile(wxBitmap *bitmap,
  91                           const wxString& name, long flags,
  92                           int desiredWidth, int desiredHeight);
  93
  94 private:
  95     DECLARE_DYNAMIC_CLASS(wxBMPResourceHandler)
  96 };
  97
  98 class WXDLLEXPORT wxIconHandler : public wxGDIImageHandler
  99 {
 100 public:
 101     wxIconHandler(const wxString& name, const wxString& ext, long type)
 102         : wxGDIImageHandler(name, ext, type)
 103     {
 104     }
 105
 106     // creating and saving icons is not supported
 107     virtual bool Create(wxGDIImage *WXUNUSED(image),
 108                         void *WXUNUSED(data),
 109                         long WXUNUSED(flags),
 110                         int WXUNUSED(width),
 111                         int WXUNUSED(height),
 112                         int WXUNUSED(depth) = 1)
 113     {
 114         return false;
 115     }
 116
 117     virtual bool Save(wxGDIImage *WXUNUSED(image),
 118                       const wxString& WXUNUSED(name),
 119                       int WXUNUSED(type))
 120     {
 121         return false;
 122     }
 123
 124     virtual bool Load(wxGDIImage *image,
 125                       const wxString& name,
 126                       long flags,
 127                       int desiredWidth, int desiredHeight)
 128     {
 129         wxIcon *icon = wxDynamicCast(image, wxIcon);
 130         wxCHECK_MSG( icon, false, _T("wxIconHandler only works with icons") );
 131
 132         return LoadIcon(icon, name, flags, desiredWidth, desiredHeight);
 133     }
 134
 135 protected:
 136     virtual bool LoadIcon(wxIcon *icon,
 137                           const wxString& name, long flags,
 138                           int desiredWidth = -1, int desiredHeight = -1) = 0;
 139 };
 140
 141 class WXDLLEXPORT wxICOFileHandler : public wxIconHandler
 142 {
 143 public:
 144     wxICOFileHandler() : wxIconHandler(_T("ICO icon file"),
 145                                        _T("ico"),
 146                                        wxBITMAP_TYPE_ICO)
 147     {
 148     }
 149
 150 protected:
 151     virtual bool LoadIcon(wxIcon *icon,
 152                           const wxString& name, long flags,
 153                           int desiredWidth = -1, int desiredHeight = -1);
 154
 155 private:
 156     DECLARE_DYNAMIC_CLASS(wxICOFileHandler)
 157 };
 158
 159 class WXDLLEXPORT wxICOResourceHandler: public wxIconHandler
 160 {
 161 public:
 162     wxICOResourceHandler() : wxIconHandler(_T("ICO resource"),
 163                                            _T("ico"),
 164                                            wxBITMAP_TYPE_ICO_RESOURCE)
 165     {
 166     }
 167
 168 protected:
 169     virtual bool LoadIcon(wxIcon *icon,
 170                           const wxString& name, long flags,
 171                           int desiredWidth = -1, int desiredHeight = -1);
 172
 173 private:
 174     DECLARE_DYNAMIC_CLASS(wxICOResourceHandler)
 175 };
 176
 177 // ----------------------------------------------------------------------------
 178 // wxWin macros
 179 // ----------------------------------------------------------------------------
 180
 181 IMPLEMENT_DYNAMIC_CLASS(wxBMPFileHandler, wxBitmapHandler)
 182 IMPLEMENT_DYNAMIC_CLASS(wxBMPResourceHandler, wxBitmapHandler)
 183 IMPLEMENT_DYNAMIC_CLASS(wxICOFileHandler, wxObject)
 184 IMPLEMENT_DYNAMIC_CLASS(wxICOResourceHandler, wxObject)
 185
 186 // ----------------------------------------------------------------------------
 187 // private functions
 188 // ----------------------------------------------------------------------------
 189
 190 #endif
 191     // __MICROWIN__
 192
 193 // ============================================================================
 194 // implementation
 195 // ============================================================================
 196
 197 wxGDIImageHandlerList wxGDIImage::ms_handlers;
 198
 199 // ----------------------------------------------------------------------------
 200 // wxGDIImage functions forwarded to wxGDIImageRefData
 201 // ----------------------------------------------------------------------------
 202
 203 bool wxGDIImage::FreeResource(bool WXUNUSED(force))
 204 {
 205     if ( !IsNull() )
 206     {
 207         GetGDIImageData()->Free();
 208         GetGDIImageData()->m_handle = 0;
 209     }
 210
 211     return true;
 212 }
 213
 214 WXHANDLE wxGDIImage::GetResourceHandle() const
 215 {
 216     return GetHandle();
 217 }
 218
 219 // ----------------------------------------------------------------------------
 220 // wxGDIImage handler stuff
 221 // ----------------------------------------------------------------------------
 222
 223 void wxGDIImage::AddHandler(wxGDIImageHandler *handler)
 224 {
 225     ms_handlers.Append(handler);
 226 }
 227
 228 void wxGDIImage::InsertHandler(wxGDIImageHandler *handler)
 229 {
 230     ms_handlers.Insert(handler);
 231 }
 232
 233 bool wxGDIImage::RemoveHandler(const wxString& name)
 234 {
 235     wxGDIImageHandler *handler = FindHandler(name);
 236     if ( handler )
 237     {
 238         ms_handlers.DeleteObject(handler);
 239         return true;
 240     }
 241     else
 242         return false;
 243 }
 244
 245 wxGDIImageHandler *wxGDIImage::FindHandler(const wxString& name)
 246 {
 247     wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
 248     while ( node )
 249     {
 250         wxGDIImageHandler *handler = node->GetData();
 251         if ( handler->GetName() == name )
 252             return handler;
 253         node = node->GetNext();
 254     }
 255
 256     return NULL;
 257 }
 258
 259 wxGDIImageHandler *wxGDIImage::FindHandler(const wxString& extension,
 260                                            long type)
 261 {
 262     wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
 263     while ( node )
 264     {
 265         wxGDIImageHandler *handler = node->GetData();
 266         if ( (handler->GetExtension() == extension) &&
 267              (type == -1 || handler->GetType() == type) )
 268         {
 269             return handler;
 270         }
 271
 272         node = node->GetNext();
 273     }
 274     return NULL;
 275 }
 276
 277 wxGDIImageHandler *wxGDIImage::FindHandler(long type)
 278 {
 279     wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
 280     while ( node )
 281     {
 282         wxGDIImageHandler *handler = node->GetData();
 283         if ( handler->GetType() == type )
 284             return handler;
 285
 286         node = node->GetNext();
 287     }
 288
 289     return NULL;
 290 }
 291
 292 void wxGDIImage::CleanUpHandlers()
 293 {
 294     wxGDIImageHandlerList::compatibility_iterator node = ms_handlers.GetFirst();
 295     while ( node )
 296     {
 297         wxGDIImageHandler *handler = node->GetData();
 298         wxGDIImageHandlerList::compatibility_iterator next = node->GetNext();
 299         delete handler;
 300         ms_handlers.Erase( node );
 301         node = next;
 302     }
 303 }
 304
 305 void wxGDIImage::InitStandardHandlers()
 306 {
 307 #ifndef __WXMICROWIN__
 308     AddHandler(new wxBMPResourceHandler);
 309     AddHandler(new wxBMPFileHandler);
 310     AddHandler(new wxICOResourceHandler);
 311     AddHandler(new wxICOFileHandler);
 312 #endif
 313 }
 314
 315 #ifndef __WXMICROWIN__
 316
 317 // ----------------------------------------------------------------------------
 318 // wxBitmap handlers
 319 // ----------------------------------------------------------------------------
 320
 321 bool wxBMPResourceHandler::LoadFile(wxBitmap *bitmap,
 322                                     const wxString& name, long WXUNUSED(flags),
 323                                     int WXUNUSED(desiredWidth),
 324                                     int WXUNUSED(desiredHeight))
 325 {
 326     // TODO: load colourmap.
 327     bitmap->SetHBITMAP((WXHBITMAP)::LoadBitmap(wxGetInstance(), name));
 328
 329     if ( !bitmap->Ok() )
 330     {
 331         // it's probably not found
 332         wxLogError(wxT("Can't load bitmap '%s' from resources! Check .rc file."),
 333                    name.c_str());
 334
 335         return false;
 336     }
 337
 338     BITMAP bm;
 339     if ( !::GetObject(GetHbitmapOf(*bitmap), sizeof(BITMAP), (LPSTR) &bm) )
 340     {
 341         wxLogLastError(wxT("GetObject(HBITMAP)"));
 342     }
 343
 344     bitmap->SetWidth(bm.bmWidth);
 345     bitmap->SetHeight(bm.bmHeight);
 346     bitmap->SetDepth(bm.bmBitsPixel);
 347
 348     // use 0xc0c0c0 as transparent colour by default
 349     bitmap->SetMask(new wxMask(*bitmap, *wxLIGHT_GREY));
 350
 351     return true;
 352 }
 353
 354 bool wxBMPFileHandler::LoadFile(wxBitmap *bitmap,
 355                                 const wxString& name, long WXUNUSED(flags),
 356                                 int WXUNUSED(desiredWidth),
 357                                 int WXUNUSED(desiredHeight))
 358 {
 359 #if wxUSE_WXDIB
 360     wxCHECK_MSG( bitmap, false, _T("NULL bitmap in LoadFile") );
 361
 362     wxDIB dib(name);
 363
 364     return dib.IsOk() && bitmap->CopyFromDIB(dib);
 365 #else
 366     return false;
 367 #endif
 368 }
 369
 370 bool wxBMPFileHandler::SaveFile(wxBitmap *bitmap,
 371                                 const wxString& name,
 372                                 int WXUNUSED(type),
 373                                 const wxPalette * WXUNUSED(pal))
 374 {
 375 #if wxUSE_WXDIB
 376     wxCHECK_MSG( bitmap, false, _T("NULL bitmap in SaveFile") );
 377
 378     wxDIB dib(*bitmap);
 379
 380     return dib.Save(name);
 381 #else
 382     return false;
 383 #endif
 384 }
 385
 386 // ----------------------------------------------------------------------------
 387 // wxIcon handlers
 388 // ----------------------------------------------------------------------------
 389
 390 bool wxICOFileHandler::LoadIcon(wxIcon *icon,
 391                                 const wxString& name,
 392                                 long WXUNUSED(flags),
 393                                 int desiredWidth, int desiredHeight)
 394 {
 395     icon->UnRef();
 396
 397     // actual size
 398     wxSize size;
 399
 400     HICON hicon = NULL;
 401
 402     // Parse the filename: it may be of the form "filename;n" in order to
 403     // specify the nth icon in the file.
 404     //
 405     // For the moment, ignore the issue of possible semicolons in the
 406     // filename.
 407     int iconIndex = 0;
 408     wxString nameReal(name);
 409     wxString strIconIndex = name.AfterLast(wxT(';'));
 410     if (strIconIndex != name)
 411     {
 412         iconIndex = wxAtoi(strIconIndex);
 413         nameReal = name.BeforeLast(wxT(';'));
 414     }
 415
 416 #if 0
 417     // If we don't know what size icon we're looking for,
 418     // try to find out what's there.
 419     // Unfortunately this doesn't work, because ExtractIconEx
 420     // will scale the icon to the 'desired' size, even if that
 421     // size of icon isn't explicitly stored. So we would have
 422     // to parse the icon file outselves.
 423     if ( desiredWidth == -1 &&
 424          desiredHeight == -1)
 425     {
 426         // Try loading a large icon first
 427         if ( ::ExtractIconEx(nameReal, iconIndex, &hicon, NULL, 1) == 1)
 428         {
 429         }
 430         // Then try loading a small icon
 431         else if ( ::ExtractIconEx(nameReal, iconIndex, NULL, &hicon, 1) == 1)
 432         {
 433         }
 434     }
 435     else
 436 #endif
 437         // were we asked for a large icon?
 438     if ( desiredWidth == ::GetSystemMetrics(SM_CXICON) &&
 439          desiredHeight == ::GetSystemMetrics(SM_CYICON) )
 440     {
 441         // get the specified large icon from file
 442         if ( !::ExtractIconEx(nameReal, iconIndex, &hicon, NULL, 1) )
 443         {
 444             // it is not an error, but it might still be useful to be informed
 445             // about it optionally
 446             wxLogTrace(_T("iconload"),
 447                        _T("No large icons found in the file '%s'."),
 448                        name.c_str());
 449         }
 450     }
 451     else if ( desiredWidth == ::GetSystemMetrics(SM_CXSMICON) &&
 452               desiredHeight == ::GetSystemMetrics(SM_CYSMICON) )
 453     {
 454         // get the specified small icon from file
 455         if ( !::ExtractIconEx(nameReal, iconIndex, NULL, &hicon, 1) )
 456         {
 457             wxLogTrace(_T("iconload"),
 458                        _T("No small icons found in the file '%s'."),
 459                        name.c_str());
 460         }
 461     }
 462     //else: not standard size, load below
 463
 464 #ifndef __WXWINCE__
 465     if ( !hicon )
 466     {
 467         // take any size icon from the file by index
 468         hicon = ::ExtractIcon(wxGetInstance(), nameReal, iconIndex);
 469     }
 470 #endif
 471
 472     if ( !hicon )
 473     {
 474         wxLogSysError(_T("Failed to load icon from the file '%s'"),
 475                       name.c_str());
 476
 477         return false;
 478     }
 479
 480     size = wxGetHiconSize(hicon);
 481
 482     if ( (desiredWidth != -1 && desiredWidth != size.x) ||
 483          (desiredHeight != -1 && desiredHeight != size.y) )
 484     {
 485         wxLogTrace(_T("iconload"),
 486                    _T("Returning false from wxICOFileHandler::Load because of the size mismatch: actual (%d, %d), requested (%d, %d)"),
 487                    size.x, size.y,
 488                    desiredWidth, desiredHeight);
 489
 490         ::DestroyIcon(hicon);
 491
 492         return false;
 493     }
 494
 495     icon->SetHICON((WXHICON)hicon);
 496     icon->SetSize(size.x, size.y);
 497
 498     return icon->Ok();
 499 }
 500
 501 bool wxICOResourceHandler::LoadIcon(wxIcon *icon,
 502                                     const wxString& name,
 503                                     long WXUNUSED(flags),
 504                                     int desiredWidth, int desiredHeight)
 505 {
 506     HICON hicon;
 507
 508     // do we need the icon of the specific size or would any icon do?
 509     bool hasSize = desiredWidth != -1 || desiredHeight != -1;
 510
 511     wxASSERT_MSG( !hasSize || (desiredWidth != -1 && desiredHeight != -1),
 512                   _T("width and height should be either both -1 or not") );
 513
 514     // try to load the icon from this program first to allow overriding the
 515     // standard icons (although why one would want to do it considering that
 516     // we already have wxApp::GetStdIcon() is unclear)
 517
 518     // note that we can't just always call LoadImage() because it seems to do
 519     // some icon rescaling internally which results in very ugly 16x16 icons
 520     if ( hasSize )
 521     {
 522         hicon = (HICON)::LoadImage(wxGetInstance(), name, IMAGE_ICON,
 523                                     desiredWidth, desiredHeight,
 524                                     LR_DEFAULTCOLOR);
 525     }
 526     else
 527     {
 528         hicon = ::LoadIcon(wxGetInstance(), name);
 529     }
 530
 531     // next check if it's not a standard icon
 532 #ifndef __WXWINCE__
 533     if ( !hicon && !hasSize )
 534     {
 535         static const struct
 536         {
 537             const wxChar *name;
 538             LPTSTR id;
 539         } stdIcons[] =
 540         {
 541             { wxT("wxICON_QUESTION"),   IDI_QUESTION    },
 542             { wxT("wxICON_WARNING"),    IDI_EXCLAMATION },
 543             { wxT("wxICON_ERROR"),      IDI_HAND        },
 544             { wxT("wxICON_INFORMATION"),       IDI_ASTERISK    },
 545         };
 546
 547         for ( size_t nIcon = 0; !hicon && nIcon < WXSIZEOF(stdIcons); nIcon++ )
 548         {
 549             if ( name == stdIcons[nIcon].name )
 550             {
 551                 hicon = ::LoadIcon((HINSTANCE)NULL, stdIcons[nIcon].id);
 552             }
 553         }
 554     }
 555 #endif
 556
 557     wxSize size = wxGetHiconSize(hicon);
 558     icon->SetSize(size.x, size.y);
 559
 560     icon->SetHICON((WXHICON)hicon);
 561
 562     return icon->Ok();
 563 }
 564
 565 // ----------------------------------------------------------------------------
 566 // private functions
 567 // ----------------------------------------------------------------------------
 568
 569 wxSize wxGetHiconSize(HICON WXUNUSED_IN_WINCE(hicon))
 570 {
 571     // default icon size on this hardware
 572     // usually 32x32 but can be other (smaller) on pocket devices
 573     wxSize size(::GetSystemMetrics(SM_CXICON), ::GetSystemMetrics(SM_CYICON));
 574
 575 #ifndef __WXWINCE__
 576     if ( hicon && wxGetOsVersion() != wxWIN32S )
 577     {
 578         ICONINFO info;
 579         if ( !::GetIconInfo(hicon, &info) )
 580         {
 581             wxLogLastError(wxT("GetIconInfo"));
 582         }
 583         else
 584         {
 585             HBITMAP hbmp = info.hbmMask;
 586             if ( hbmp )
 587             {
 588                 BITMAP bm;
 589                 if ( ::GetObject(hbmp, sizeof(BITMAP), (LPSTR) &bm) )
 590                 {
 591                     size = wxSize(bm.bmWidth, bm.bmHeight);
 592                 }
 593
 594                 ::DeleteObject(info.hbmMask);
 595             }
 596             if ( info.hbmColor )
 597                 ::DeleteObject(info.hbmColor);
 598         }
 599     }
 600 #endif
 601
 602     return size;
 603 }
 604
 605 #endif // __WXMICROWIN__
 606