src/generic/animateg.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        animateg.cpp
   3 // Purpose:     wxAnimation and wxAnimationCtrl
   4 // Author:      Julian Smart and Guillermo Rodriguez Garcia
   5 // Modified by: Francesco Montorsi
   6 // Created:     13/8/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Guillermo Rodriguez Garcia
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15   #pragma hdrstop
  16 #endif  //__BORLANDC__
  17
  18
  19 #if wxUSE_ANIMATIONCTRL
  20
  21 #include "wx/log.h"
  22 #include "wx/wfstream.h"
  23 #include "wx/image.h"
  24 #include "wx/gifdecod.h"
  25 #include "wx/anidecod.h"
  26 #include "wx/dcmemory.h"
  27 #include "wx/dc.h"
  28 #include "wx/dcclient.h"
  29 #include "wx/animate.h"
  30 #include "wx/animdecod.h"
  31
  32
  33 #include <wx/listimpl.cpp>
  34 WX_DEFINE_LIST(wxAnimationDecoderList);
  35
  36 wxAnimationDecoderList wxAnimation::sm_handlers;
  37
  38
  39
  40 // ----------------------------------------------------------------------------
  41 // wxAnimation
  42 // ----------------------------------------------------------------------------
  43
  44 IMPLEMENT_DYNAMIC_CLASS(wxAnimation, wxAnimationBase)
  45 #define M_ANIMDATA      wx_static_cast(wxAnimationDecoder*, m_refData)
  46
  47 wxSize wxAnimation::GetSize() const
  48 {
  49     wxCHECK_MSG( IsOk(), wxDefaultSize, wxT("invalid animation") );
  50
  51     return M_ANIMDATA->GetAnimationSize();
  52 }
  53
  54 size_t wxAnimation::GetFrameCount() const
  55 {
  56     wxCHECK_MSG( IsOk(), 0, wxT("invalid animation") );
  57
  58     return M_ANIMDATA->GetFrameCount();
  59 }
  60
  61 wxImage wxAnimation::GetFrame(size_t i) const
  62 {
  63     wxCHECK_MSG( IsOk(), wxNullImage, wxT("invalid animation") );
  64
  65     wxImage ret;
  66     if (!M_ANIMDATA->ConvertToImage(i, &ret))
  67         return wxNullImage;
  68     return ret;
  69 }
  70
  71 int wxAnimation::GetDelay(size_t i) const
  72 {
  73     wxCHECK_MSG( IsOk(), 0, wxT("invalid animation") );
  74
  75     return M_ANIMDATA->GetDelay(i);
  76 }
  77
  78 wxPoint wxAnimation::GetFramePosition(size_t frame) const
  79 {
  80     wxCHECK_MSG( IsOk(), wxDefaultPosition, wxT("invalid animation") );
  81
  82     return M_ANIMDATA->GetFramePosition(frame);
  83 }
  84
  85 wxAnimationDisposal wxAnimation::GetDisposalMethod(size_t frame) const
  86 {
  87     wxCHECK_MSG( IsOk(), wxANIM_UNSPECIFIED, wxT("invalid animation") );
  88
  89     return M_ANIMDATA->GetDisposalMethod(frame);
  90 }
  91
  92 wxColour wxAnimation::GetBackgroundColour() const
  93 {
  94     wxCHECK_MSG( IsOk(), wxNullColour, wxT("invalid animation") );
  95
  96     return M_ANIMDATA->GetBackgroundColour();
  97 }
  98
  99 bool wxAnimation::LoadFile(const wxString& filename, wxAnimationType type)
 100 {
 101     wxFileInputStream stream(filename);
 102     if (!stream.Ok())
 103         return false;
 104
 105     return Load(stream, type);
 106 }
 107
 108 bool wxAnimation::Load(wxInputStream &stream, wxAnimationType type)
 109 {
 110     UnRef();
 111
 112     const wxAnimationDecoder *handler;
 113     if ( type == wxANIMATION_TYPE_ANY )
 114     {
 115         for ( wxAnimationDecoderList::compatibility_iterator node = sm_handlers.GetFirst();
 116               node; node = node->GetNext() )
 117         {
 118             handler=(const wxAnimationDecoder*)node->GetData();
 119
 120             if ( handler->CanRead(stream) )
 121             {
 122                 // do a copy of the handler from the static list which we will own
 123                 // as our reference data
 124                 m_refData = handler->Clone();
 125                 return M_ANIMDATA->Load(stream);
 126             }
 127
 128         }
 129
 130         wxLogWarning( _("No handler found for animation type.") );
 131         return false;
 132     }
 133
 134     handler = FindHandler(type);
 135
 136     // do a copy of the handler from the static list which we will own
 137     // as our reference data
 138     m_refData = handler->Clone();
 139
 140     if (handler == NULL)
 141     {
 142         wxLogWarning( _("No animation handler for type %ld defined."), type );
 143
 144         return false;
 145     }
 146
 147     if (stream.IsSeekable() && !M_ANIMDATA->CanRead(stream))
 148     {
 149         wxLogError(_("Animation file is not of type %ld."), type);
 150         return false;
 151     }
 152     else
 153         return M_ANIMDATA->Load(stream);
 154 }
 155
 156
 157 // ----------------------------------------------------------------------------
 158 // animation decoders
 159 // ----------------------------------------------------------------------------
 160
 161 void wxAnimation::AddHandler( wxAnimationDecoder *handler )
 162 {
 163     // Check for an existing handler of the type being added.
 164     if (FindHandler( handler->GetType() ) == 0)
 165     {
 166         sm_handlers.Append( handler );
 167     }
 168     else
 169     {
 170         // This is not documented behaviour, merely the simplest 'fix'
 171         // for preventing duplicate additions.  If someone ever has
 172         // a good reason to add and remove duplicate handlers (and they
 173         // may) we should probably refcount the duplicates.
 174         //   also an issue in InsertHandler below.
 175
 176         wxLogDebug( _T("Adding duplicate animation handler for '%d' type"),
 177                     handler->GetType() );
 178         delete handler;
 179     }
 180 }
 181
 182 void wxAnimation::InsertHandler( wxAnimationDecoder *handler )
 183 {
 184     // Check for an existing handler of the type being added.
 185     if (FindHandler( handler->GetType() ) == 0)
 186     {
 187         sm_handlers.Insert( handler );
 188     }
 189     else
 190     {
 191         // see AddHandler for additional comments.
 192         wxLogDebug( _T("Inserting duplicate animation handler for '%d' type"),
 193                     handler->GetType() );
 194         delete handler;
 195     }
 196 }
 197
 198 const wxAnimationDecoder *wxAnimation::FindHandler( wxAnimationType animType )
 199 {
 200     wxAnimationDecoderList::compatibility_iterator node = sm_handlers.GetFirst();
 201     while (node)
 202     {
 203         const wxAnimationDecoder *handler = (const wxAnimationDecoder *)node->GetData();
 204         if (handler->GetType() == animType) return handler;
 205         node = node->GetNext();
 206     }
 207     return 0;
 208 }
 209
 210 void wxAnimation::InitStandardHandlers()
 211 {
 212     AddHandler(new wxGIFDecoder);
 213     AddHandler(new wxANIDecoder);
 214 }
 215
 216 void wxAnimation::CleanUpHandlers()
 217 {
 218     wxAnimationDecoderList::compatibility_iterator node = sm_handlers.GetFirst();
 219     while (node)
 220     {
 221         wxAnimationDecoder *handler = (wxAnimationDecoder *)node->GetData();
 222         wxAnimationDecoderList::compatibility_iterator next = node->GetNext();
 223         delete handler;
 224         node = next;
 225     }
 226
 227     sm_handlers.Clear();
 228 }
 229
 230
 231 // A module to allow wxAnimation initialization/cleanup
 232 // without calling these functions from app.cpp or from
 233 // the user's application.
 234
 235 class wxAnimationModule: public wxModule
 236 {
 237 DECLARE_DYNAMIC_CLASS(wxAnimationModule)
 238 public:
 239     wxAnimationModule() {}
 240     bool OnInit() { wxAnimation::InitStandardHandlers(); return true; };
 241     void OnExit() { wxAnimation::CleanUpHandlers(); };
 242 };
 243
 244 IMPLEMENT_DYNAMIC_CLASS(wxAnimationModule, wxModule)
 245
 246
 247
 248
 249 // ----------------------------------------------------------------------------
 250 // wxAnimationCtrl
 251 // ----------------------------------------------------------------------------
 252
 253 IMPLEMENT_CLASS(wxAnimationCtrl, wxAnimationCtrlBase)
 254 BEGIN_EVENT_TABLE(wxAnimationCtrl, wxAnimationCtrlBase)
 255     EVT_PAINT(wxAnimationCtrl::OnPaint)
 256     EVT_SIZE(wxAnimationCtrl::OnSize)
 257     EVT_TIMER(wxID_ANY, wxAnimationCtrl::OnTimer)
 258 END_EVENT_TABLE()
 259
 260 bool wxAnimationCtrl::Create(wxWindow *parent, wxWindowID id,
 261             const wxAnimation& animation, const wxPoint& pos,
 262             const wxSize& size, long style, const wxString& name)
 263 {
 264     m_animation = animation;
 265     m_currentFrame = 0;
 266     m_looped = true;
 267     m_isPlaying = false;
 268     m_useWinBackgroundColour = false;
 269     m_timer.SetOwner(this);
 270
 271     if (!wxControl::Create(parent, id, pos, size, style, wxDefaultValidator, name))
 272         return false;
 273
 274     // by default we get the same background colour of our parent
 275     SetBackgroundColour(parent->GetBackgroundColour());
 276     return true;
 277 }
 278
 279 wxAnimationCtrl::~wxAnimationCtrl()
 280 {
 281     Stop();
 282 }
 283
 284 bool wxAnimationCtrl::LoadFile(const wxString& filename, wxAnimationType type)
 285 {
 286     wxAnimation anim;
 287     if (!anim.LoadFile(filename, type) ||
 288         !anim.IsOk())
 289         return false;
 290
 291     SetAnimation(anim);
 292     return true;
 293 }
 294
 295 wxSize wxAnimationCtrl::DoGetBestSize() const
 296 {
 297     if (m_animation.IsOk() && !this->HasFlag(wxAC_NO_AUTORESIZE))
 298         return m_animation.GetSize();
 299
 300     return wxSize(100, 100);
 301 }
 302
 303 void wxAnimationCtrl::SetAnimation(const wxAnimation& animation)
 304 {
 305     if (IsPlaying())
 306         Stop();
 307
 308     m_animation = animation;
 309
 310     if (m_animation.GetBackgroundColour() == wxNullColour)
 311         SetUseWindowBackgroundColour();
 312     if (!this->HasFlag(wxAC_NO_AUTORESIZE))
 313         FitToAnimation();
 314
 315     // display first frame
 316     m_currentFrame = 0;
 317     if (m_animation.IsOk())
 318         RebuildBackingStoreUpToFrame(0);
 319     else
 320     {
 321         // clear to
 322         wxMemoryDC dc;
 323         dc.SelectObject(m_backingStore);
 324
 325         // Draw the background
 326         DisposeToBackground(dc);
 327     }
 328
 329     Refresh();
 330 }
 331
 332 void wxAnimationCtrl::FitToAnimation()
 333 {
 334     SetSize(m_animation.GetSize());
 335 }
 336
 337
 338 // ----------------------------------------------------------------------------
 339 // wxAnimationCtrl - stop/play methods
 340 // ----------------------------------------------------------------------------
 341
 342 void wxAnimationCtrl::Stop()
 343 {
 344     // leave current frame displayed until Play() is called again
 345     m_timer.Stop();
 346     m_isPlaying = false;
 347 }
 348
 349 bool wxAnimationCtrl::Play(bool looped)
 350 {
 351     if (!m_animation.IsOk())
 352         return false;
 353
 354     int oldframe = m_currentFrame;
 355     m_looped = looped;
 356     m_currentFrame = 0;
 357     m_isPlaying = true;
 358
 359     // small optimization: if the back store was already updated to the
 360     // first frame, don't rebuild it
 361     if (oldframe != 0)
 362         RebuildBackingStoreUpToFrame(0);
 363
 364     // DrawCurrentFrame() will use our updated backing store
 365     wxClientDC clientDC(this);
 366     DrawCurrentFrame(clientDC);
 367
 368     // start the timer
 369     int delay = m_animation.GetDelay(0);
 370     if (delay == 0)
 371         delay = 1;      // 0 is invalid timeout for wxTimer.
 372     m_timer.Start(delay);
 373
 374     return true;
 375 }
 376
 377
 378
 379 // ----------------------------------------------------------------------------
 380 // wxAnimationCtrl - rendering methods
 381 // ----------------------------------------------------------------------------
 382
 383 void wxAnimationCtrl::RebuildBackingStoreUpToFrame(size_t frame)
 384 {
 385     // if we've not created the backing store yet or it's too
 386     // small, then recreate it
 387     wxSize sz = m_animation.GetSize(),
 388            winsz = GetClientSize();
 389     int w = wxMin(sz.GetWidth(), winsz.GetWidth());
 390     int h = wxMin(sz.GetHeight(), winsz.GetHeight());
 391
 392     if (m_backingStore.GetWidth() < w ||
 393         m_backingStore.GetHeight() < h)
 394         m_backingStore.Create(w, h);
 395
 396     wxMemoryDC dc;
 397     dc.SelectObject(m_backingStore);
 398
 399     // Draw the background
 400     DisposeToBackground(dc);
 401
 402     // Draw all intermediate frames that haven't been removed from the animation
 403     for (size_t i = 0; i < frame; i++)
 404     {
 405         if (m_animation.GetDisposalMethod(i) == wxANIM_DONOTREMOVE ||
 406             m_animation.GetDisposalMethod(i) == wxANIM_UNSPECIFIED)
 407         {
 408             DrawFrame(dc, i);
 409         }
 410     }
 411
 412     // finally draw this frame
 413     DrawFrame(dc, frame);
 414     dc.SelectObject(wxNullBitmap);
 415 }
 416
 417 void wxAnimationCtrl::IncrementalUpdateBackingStore()
 418 {
 419     wxMemoryDC dc;
 420     dc.SelectObject(m_backingStore);
 421
 422     // OPTIMIZATION:
 423     // since wxAnimationCtrl can only play animations forward, without skipping
 424     // frames, we can be sure that m_backingStore contains the m_currentFrame-1
 425     // frame and thus we just need to dispose the m_currentFrame-1 frame and
 426     // render the m_currentFrame-th one.
 427
 428     if (m_currentFrame == 0)
 429     {
 430         // before drawing the first frame always dispose to bg colour
 431         DisposeToBackground(dc);
 432     }
 433     else
 434     {
 435         switch (m_animation.GetDisposalMethod(m_currentFrame-1))
 436         {
 437         case wxANIM_TOBACKGROUND:
 438             DisposeToBackground(dc);
 439             break;
 440
 441         case wxANIM_TOPREVIOUS:
 442             // this disposal should never be used too often.
 443             // E.g. GIF specification explicitely say to keep the usage of this
 444             //      disposal limited to the minimum.
 445             // In fact it may require a lot of time to restore
 446             if (m_currentFrame == 1)
 447             {
 448                 // if 0-th frame disposal is to restore to previous frame,
 449                 // the best we can do is to restore to background
 450                 DisposeToBackground(dc);
 451             }
 452             else
 453                 RebuildBackingStoreUpToFrame(m_currentFrame-2);
 454             break;
 455
 456         case wxANIM_DONOTREMOVE:
 457         case wxANIM_UNSPECIFIED:
 458             break;
 459         }
 460     }
 461
 462     // now just draw the current frame on the top of the backing store
 463     DrawFrame(dc, m_currentFrame);
 464     dc.SelectObject(wxNullBitmap);
 465 }
 466
 467 void wxAnimationCtrl::DrawFrame(wxDC &dc, size_t frame)
 468 {
 469     // PERFORMANCE NOTE:
 470     // this draw stuff is not as fast as possible: the wxAnimationDecoder
 471     // needs first to convert from its internal format to wxImage RGB24;
 472     // the wxImage is then converted as a wxBitmap and finally blitted.
 473     // If wxAnimationDecoder had a function to convert directly from its
 474     // internal format to a port-specific wxBitmap, it would be somewhat faster.
 475     wxBitmap bmp(m_animation.GetFrame(frame));
 476     dc.DrawBitmap(bmp, m_animation.GetFramePosition(frame),
 477                   true /* use mask */);
 478 }
 479
 480 void wxAnimationCtrl::DrawCurrentFrame(wxDC& dc)
 481 {
 482     wxASSERT(m_backingStore.Ok());
 483
 484     // m_backingStore always contains the current frame
 485     dc.DrawBitmap(m_backingStore, 0, 0);
 486 }
 487
 488 void wxAnimationCtrl::DisposeToBackground(wxDC& dc)
 489 {
 490     wxBrush brush(IsUsingWindowBackgroundColour() ?
 491                   this->GetBackgroundColour() : m_animation.GetBackgroundColour(), wxSOLID);
 492     dc.SetBackground(brush);
 493     dc.Clear();
 494 }
 495
 496 // ----------------------------------------------------------------------------
 497 // wxAnimationCtrl - event handlers
 498 // ----------------------------------------------------------------------------
 499
 500 void wxAnimationCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 501 {
 502     // VERY IMPORTANT: the wxPaintDC *must* be created in any case
 503     wxPaintDC dc(this);
 504
 505     // both if we are playing or not, we need to refresh the current frame
 506     if (m_backingStore.Ok())
 507         DrawCurrentFrame(dc);
 508     //else: m_animation is not valid and thus we don't have a valid backing store...
 509 }
 510
 511 void wxAnimationCtrl::OnTimer(wxTimerEvent &WXUNUSED(event))
 512 {
 513     m_currentFrame++;
 514     if (m_currentFrame == m_animation.GetFrameCount())
 515     {
 516         // Should a non-looped animation display the last frame?
 517         if (!m_looped)
 518         {
 519             m_timer.Stop();
 520             m_isPlaying = false;
 521             return;
 522         }
 523         else
 524             m_currentFrame = 0;     // let's restart
 525     }
 526
 527     IncrementalUpdateBackingStore();
 528
 529     wxClientDC dc(this);
 530     DrawCurrentFrame(dc);
 531
 532     // Set the timer for the next frame
 533     int delay = m_animation.GetDelay(m_currentFrame);
 534     if (delay == 0)
 535         delay = 1;      // 0 is invalid timeout for wxTimer.
 536     m_timer.Start(delay);
 537 }
 538
 539 void wxAnimationCtrl::OnSize(wxSizeEvent &WXUNUSED(event))
 540 {
 541     // NB: resizing an animation control may take a lot of time
 542     //     for big animations as the backing store must be
 543     //     extended and rebuilt. Try to avoid it!!
 544     if (m_animation.IsOk())
 545         RebuildBackingStoreUpToFrame(m_currentFrame);
 546 }
 547
 548 #endif      // wxUSE_ANIMATIONCTRL
 549