src/msw/gdiimage.cpp

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