src/XGUI/XGUI_ViewPort.cpp

   1 #ifndef WIN32
   2 # ifndef GLX_GLXEXT_LEGACY
   3 #  define GLX_GLXEXT_LEGACY
   4 # endif
   5 # include <GL/glx.h>
   6 # include <dlfcn.h>
   7 #else
   8 # include <windows.h>
   9 # include <wingdi.h>
  10 #endif
  11
  12 #include "XGUI_ViewPort.h"
  13 #include "XGUI_ViewWindow.h"
  14 #include "XGUI_Viewer.h"
  15 #include "XGUI_Constants.h"
  16
  17 #include <QPaintEvent>
  18 #include <QPainter>
  19 #include <QFileInfo>
  20
  21 #include <V3d_OrthographicView.hxx>
  22 #include <V3d_PerspectiveView.hxx>
  23 #include <Visual3d_View.hxx>
  24
  25 #ifdef WIN32
  26 #include <WNT_Window.hxx>
  27 #else
  28 #include <Xw_Window.hxx>
  29 #endif
  30
  31 #include <GL/gl.h>
  32
  33 static double rx = 0.;
  34 static double ry = 0.;
  35 static int sx = 0;
  36 static int sy = 0;
  37 static Standard_Boolean zRotation = Standard_False;
  38
  39 /*!
  40  Create native view window for CasCade view [ static ]
  41  */
  42 Handle(Aspect_Window) CreateCasWindow(const Handle(V3d_View)& view, WId winId)
  43 {
  44   Aspect_Handle aWindowHandle = (Aspect_Handle) winId;
  45 #ifdef WIN32
  46   Handle(WNT_Window) viewWindow = new WNT_Window(aWindowHandle);
  47 #else
  48   Handle(Aspect_DisplayConnection) aDispConnection = view->Viewer()->Driver()->GetDisplayConnection();
  49   Handle(Xw_Window) viewWindow = new Xw_Window( aDispConnection, aWindowHandle );
  50 #endif
  51   return viewWindow;
  52 }
  53
  54 class OpenGLUtils_FrameBuffer
  55 {
  56 public:
  57   OpenGLUtils_FrameBuffer();
  58   ~OpenGLUtils_FrameBuffer();
  59
  60   bool init(const GLsizei&, const GLsizei&);
  61   void release();
  62
  63   void bind();
  64   void unbind();
  65
  66 private:
  67   GLuint textureId;
  68   GLuint fboId;
  69   GLuint rboId;
  70 };
  71
  72 #ifndef APIENTRY
  73 #define APIENTRY
  74 #endif
  75 #ifndef APIENTRYP
  76 #define APIENTRYP APIENTRY *
  77 #endif
  78
  79 #ifndef GL_FRAMEBUFFER_EXT
  80 #define GL_FRAMEBUFFER_EXT                0x8D40
  81 #endif
  82
  83 #ifndef GL_RENDERBUFFER_EXT
  84 #define GL_RENDERBUFFER_EXT               0x8D41
  85 #endif
  86
  87 #ifndef GL_COLOR_ATTACHMENT0_EXT
  88 #define GL_COLOR_ATTACHMENT0_EXT          0x8CE0
  89 #endif
  90
  91 #ifndef GL_DEPTH_ATTACHMENT_EXT
  92 #define GL_DEPTH_ATTACHMENT_EXT           0x8D00
  93 #endif
  94
  95 #ifndef GL_FRAMEBUFFER_COMPLETE_EXT
  96 #define GL_FRAMEBUFFER_COMPLETE_EXT       0x8CD5
  97 #endif
  98
  99 typedef void (APIENTRYP PFNGLGENFRAMEBUFFERSEXTPROC)(GLsizei n, GLuint *framebuffers);
 100 typedef void (APIENTRYP PFNGLBINDFRAMEBUFFEREXTPROC)(GLenum target, GLuint framebuffer);
 101 typedef void (APIENTRYP PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)(GLenum target, GLenum attachment,
 102                                                           GLenum textarget, GLuint texture,
 103                                                           GLint level);
 104 typedef GLenum (APIENTRYP PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)(GLenum target);
 105 typedef void (APIENTRYP PFNGLDELETEFRAMEBUFFERSEXTPROC)(GLsizei n, const GLuint *framebuffers);
 106 typedef void (APIENTRYP PFNGLGENRENDERBUFFERSEXTPROC)(GLsizei n, GLuint *renderbuffers);
 107 typedef void (APIENTRYP PFNGLBINDRENDERBUFFEREXTPROC)(GLenum target, GLuint renderbuffer);
 108 typedef void (APIENTRYP PFNGLRENDERBUFFERSTORAGEEXTPROC)(GLenum target, GLenum internalformat,
 109                                                          GLsizei width, GLsizei height);
 110 typedef void (APIENTRYP PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)(GLenum target, GLenum attachment,
 111                                                              GLenum renderbuffertarget,
 112                                                              GLuint renderbuffer);
 113 typedef void (APIENTRYP PFNGLDELETERENDERBUFFERSEXTPROC)(GLsizei n, const GLuint *renderbuffers);
 114
 115 static PFNGLGENFRAMEBUFFERSEXTPROC vglGenFramebuffersEXT = NULL;
 116 static PFNGLBINDFRAMEBUFFEREXTPROC vglBindFramebufferEXT = NULL;
 117 static PFNGLFRAMEBUFFERTEXTURE2DEXTPROC vglFramebufferTexture2DEXT = NULL;
 118 static PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC vglCheckFramebufferStatusEXT = NULL;
 119 static PFNGLDELETEFRAMEBUFFERSEXTPROC vglDeleteFramebuffersEXT = NULL;
 120 static PFNGLGENRENDERBUFFERSEXTPROC vglGenRenderbuffersEXT = NULL;
 121 static PFNGLBINDRENDERBUFFEREXTPROC vglBindRenderbufferEXT = NULL;
 122 static PFNGLRENDERBUFFERSTORAGEEXTPROC vglRenderbufferStorageEXT = NULL;
 123 static PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC vglFramebufferRenderbufferEXT = NULL;
 124 static PFNGLDELETERENDERBUFFERSEXTPROC vglDeleteRenderbuffersEXT = NULL;
 125
 126 #ifndef WIN32
 127 #define GL_GetProcAddress( x ) glXGetProcAddressARB( (const GLubyte*)x )
 128 #else
 129 #define GL_GetProcAddress( x ) wglGetProcAddress( (const LPCSTR)x )
 130 #endif
 131
 132 bool InitializeEXT()
 133 {
 134   vglGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC) GL_GetProcAddress("glGenFramebuffersEXT");
 135   vglBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC) GL_GetProcAddress("glBindFramebufferEXT");
 136   vglFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC) GL_GetProcAddress(
 137       "glFramebufferTexture2DEXT");
 138   vglCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC) GL_GetProcAddress(
 139       "glCheckFramebufferStatusEXT");
 140   vglDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC) GL_GetProcAddress(
 141       "glDeleteFramebuffersEXT");
 142   vglGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC) GL_GetProcAddress(
 143       "glGenRenderbuffersEXT");
 144   vglBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC) GL_GetProcAddress(
 145       "glBindRenderbufferEXT");
 146   vglRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC) GL_GetProcAddress(
 147       "glRenderbufferStorageEXT");
 148   vglFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC) GL_GetProcAddress(
 149       "glFramebufferRenderbufferEXT");
 150   vglDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC) GL_GetProcAddress(
 151       "glDeleteRenderbuffersEXT");
 152
 153   bool ok = vglGenFramebuffersEXT && vglBindFramebufferEXT && vglFramebufferTexture2DEXT
 154       && vglCheckFramebufferStatusEXT && vglDeleteFramebuffersEXT && vglGenRenderbuffersEXT
 155       && vglBindRenderbufferEXT && vglRenderbufferStorageEXT && vglFramebufferRenderbufferEXT
 156       && vglDeleteRenderbuffersEXT;
 157
 158   return ok;
 159 }
 160
 161 static bool IsEXTInitialized = InitializeEXT();
 162
 163 OpenGLUtils_FrameBuffer::OpenGLUtils_FrameBuffer()
 164     : textureId(0), fboId(0), rboId(0)
 165 {
 166 }
 167
 168 OpenGLUtils_FrameBuffer::~OpenGLUtils_FrameBuffer()
 169 {
 170   release();
 171 }
 172
 173 bool OpenGLUtils_FrameBuffer::init(const GLsizei& xSize, const GLsizei& ySize)
 174 {
 175   char* ext = (char*) glGetString(GL_EXTENSIONS);
 176   if (!IsEXTInitialized || strstr(ext, "GL_EXT_framebuffer_object") == NULL) {
 177     qDebug( "Initializing OpenGL FrameBuffer extension failed");
 178     return false;
 179   }
 180
 181   // create a texture object
 182   glEnable (GL_TEXTURE_2D);
 183   glGenTextures(1, &textureId);
 184   glBindTexture(GL_TEXTURE_2D, textureId);
 185   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 186   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 187   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, xSize, ySize, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 188   glBindTexture(GL_TEXTURE_2D, 0);
 189
 190   // create a renderbuffer object to store depth info
 191   vglGenRenderbuffersEXT(1, &rboId);
 192   vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, rboId);
 193   vglRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, xSize, ySize);
 194   vglBindRenderbufferEXT( GL_RENDERBUFFER_EXT, 0);
 195
 196   // create a framebuffer object
 197   vglGenFramebuffersEXT(1, &fboId);
 198   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId);
 199
 200   // attach the texture to FBO color attachment point
 201   vglFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D,
 202                              textureId, 0);
 203
 204   // attach the renderbuffer to depth attachment point
 205   vglFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
 206   GL_RENDERBUFFER_EXT,
 207                                 rboId);
 208
 209   // check FBO status
 210   GLenum status = vglCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT);
 211
 212   // Unbind FBO
 213   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0);
 214
 215   return status == GL_FRAMEBUFFER_COMPLETE_EXT;
 216 }
 217
 218 void OpenGLUtils_FrameBuffer::release()
 219 {
 220   if (!IsEXTInitialized)
 221     return;
 222
 223   glDeleteTextures(1, &textureId);
 224   textureId = 0;
 225
 226   vglDeleteFramebuffersEXT(1, &fboId);
 227   fboId = 0;
 228
 229   vglDeleteRenderbuffersEXT(1, &rboId);
 230   rboId = 0;
 231 }
 232
 233 void OpenGLUtils_FrameBuffer::bind()
 234 {
 235   if (!IsEXTInitialized)
 236     return;
 237
 238   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fboId);
 239 }
 240
 241 void OpenGLUtils_FrameBuffer::unbind()
 242 {
 243   if (!IsEXTInitialized)
 244     return;
 245
 246   vglBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0);
 247 }
 248
 249 //************************************************************************
 250 //************************************************************************
 251 //************************************************************************
 252 XGUI_ViewPort::XGUI_ViewPort(XGUI_ViewWindow* theParent, const Handle(V3d_Viewer)& theViewer,
 253                              V3d_TypeOfView theType)
 254     : QWidget(theParent), myPaintersRedrawing(false), myScale(1.0), myIsAdvancedZoomingEnabled(
 255         false)
 256 {
 257   setMouseTracking(true);
 258   setBackgroundRole(QPalette::NoRole);
 259
 260   // set focus policy to threat QContextMenuEvent from keyboard
 261   setFocusPolicy(Qt::StrongFocus);
 262   setAttribute(Qt::WA_PaintOnScreen);
 263   setAttribute(Qt::WA_NoSystemBackground);
 264
 265   if (theType == V3d_ORTHOGRAPHIC) {
 266     myOrthoView = new V3d_OrthographicView(theViewer);
 267     myActiveView = myOrthoView;
 268     myPerspView = 0;
 269   } else {
 270     myPerspView = new V3d_PerspectiveView(theViewer);
 271     myActiveView = myPerspView;
 272   }
 273   myActiveView->SetSurfaceDetail(V3d_TEX_ALL);
 274 }
 275
 276 //***********************************************
 277 XGUI_ViewPort::~XGUI_ViewPort()
 278 {
 279 }
 280
 281 //***********************************************
 282 bool XGUI_ViewPort::mapView(const Handle(V3d_View)& theView)
 283 {
 284   if (!setWindow(theView))
 285     return false;
 286
 287   if (!mapped(theView)) {
 288     theView->SetWindow(myWindow);
 289     if (theView != activeView())
 290       theView->View()->Deactivate();
 291   }
 292
 293   /* create static trihedron (16551: EDF PAL 501) */
 294   //OCCViewer_ViewWindow* aVW = dynamic_cast<OCCViewer_ViewWindow*>( parentWidget()->parentWidget()->parentWidget() );
 295   //if ( aVW ) {
 296   //    OCCViewer_Viewer* aViewModel = dynamic_cast<OCCViewer_Viewer*>( aVW->getViewManager()->getViewModel() );
 297   //    if ( aViewModel && aViewModel->isStaticTrihedronDisplayed() ){
 298   //theView->ZBufferTriedronSetup();
 299   theView->TriedronDisplay(Aspect_TOTP_LEFT_LOWER, Quantity_NOC_WHITE, 0.05, V3d_ZBUFFER);
 300   //    }
 301   //}
 302
 303   emit(vpMapped());
 304
 305   return true;
 306 }
 307
 308 //***********************************************
 309 bool XGUI_ViewPort::setWindow(const Handle(V3d_View)& theView)
 310 {
 311   if (!myWindow.IsNull())
 312     return true;
 313
 314   if (theView.IsNull())
 315     return false;
 316
 317   attachWindow(theView, CreateCasWindow(theView, winId()));
 318
 319   myWindow = theView->Window();
 320   return !myWindow.IsNull();
 321 }
 322
 323 //***********************************************
 324 bool XGUI_ViewPort::mapped(const Handle(V3d_View)& theView) const
 325 {
 326   return (!theView.IsNull() && theView->View()->IsDefined());
 327 }
 328
 329 //***********************************************
 330 void XGUI_ViewPort::updateBackground()
 331 {
 332   if (activeView().IsNull())
 333     return;
 334   if (!myBackground.isValid())
 335     return;
 336
 337   // VSR: Important note on below code.
 338   // In OCCT (in version 6.5.2), things about the background drawing
 339   // are not straightforward and not clearly understandable:
 340   // - Horizontal gradient is drawn vertically (!), well ok, from top side to bottom one.
 341   // - Vertical gradient is drawn horizontally (!), from right side to left one (!!!).
 342   // - First and second diagonal gradients are confused.
 343   // - Image texture, once set, can not be removed (!).
 344   // - Texture image fill mode Aspect_FM_NONE is not taken into account (and means the same
 345   //   as Aspect_FM_CENTERED).
 346   // - The only way to cancel gradient background (and get back to single colored) is to
 347   //   set gradient background style to Aspect_GFM_NONE while passing two colors is also needed
 348   //   (see V3d_View::SetBgGradientColors() function).
 349   // - Also, it is impossible to draw texture image above the gradiented background (only above
 350   //   single-colored).
 351   // In OCCT 6.5.3 all above mentioned problems are fixed; so, above comment should be removed as soon
 352   // as SALOME is migrated to OCCT 6.5.3. The same concerns #ifdef statements in the below code
 353   switch(myBackground.mode()) {
 354   case XGUI::ColorBackground: {
 355     QColor c = myBackground.color();
 356     if (c.isValid()) {
 357       // Unset texture should be done here
 358       // ...
 359       Quantity_Color qCol(c.red() / 255., c.green() / 255., c.blue() / 255., Quantity_TOC_RGB);
 360       activeView()->SetBgGradientStyle(Aspect_GFM_NONE); // cancel gradient background
 361       activeView()->SetBgImageStyle(Aspect_FM_NONE); // cancel texture background
 362       // then change background color
 363       activeView()->SetBackgroundColor(qCol);
 364       // update viewer
 365       activeView()->Update();
 366     }
 367     break;
 368   }
 369   case XGUI::SimpleGradientBackground: {
 370     QColor c1, c2;
 371     int type = myBackground.gradient(c1, c2);
 372     if (c1.isValid() && type >= XGUI::HorizontalGradient && type <= XGUI::LastGradient) {
 373       // Unset texture should be done here
 374       // ...
 375       // Get colors and set-up gradiented background
 376       if (!c2.isValid())
 377         c2 = c1;
 378       Quantity_Color qCol1(c1.red() / 255., c1.green() / 255., c1.blue() / 255., Quantity_TOC_RGB);
 379       Quantity_Color qCol2(c2.red() / 255., c2.green() / 255., c2.blue() / 255., Quantity_TOC_RGB);
 380       activeView()->SetBgImageStyle(Aspect_FM_NONE); // cancel texture background
 381       switch(type) {
 382       case XGUI::HorizontalGradient:
 383         activeView()->SetBgGradientColors(qCol1, qCol2, Aspect_GFM_HOR,
 384         Standard_True);
 385         break;
 386       case XGUI::VerticalGradient:
 387         activeView()->SetBgGradientColors(qCol1, qCol2, Aspect_GFM_VER,
 388         Standard_True);
 389         break;
 390       case XGUI::Diagonal1Gradient:
 391         activeView()->SetBgGradientColors(qCol1, qCol2, Aspect_GFM_DIAG1,
 392         Standard_True);
 393         break;
 394       case XGUI::Diagonal2Gradient:
 395         activeView()->SetBgGradientColors(qCol1, qCol2, Aspect_GFM_DIAG2,
 396         Standard_True);
 397         break;
 398       case XGUI::Corner1Gradient:
 399         activeView()->SetBgGradientColors(qCol1, qCol2, Aspect_GFM_CORNER1,
 400         Standard_True);
 401         break;
 402       case XGUI::Corner2Gradient:
 403         activeView()->SetBgGradientColors(qCol1, qCol2, Aspect_GFM_CORNER2,
 404         Standard_True);
 405         break;
 406       case XGUI::Corner3Gradient:
 407         activeView()->SetBgGradientColors(qCol1, qCol2, Aspect_GFM_CORNER3,
 408         Standard_True);
 409         break;
 410       case XGUI::Corner4Gradient:
 411         activeView()->SetBgGradientColors(qCol1, qCol2, Aspect_GFM_CORNER4,
 412         Standard_True);
 413         break;
 414       default:
 415         break;
 416       }
 417     }
 418     break;
 419   }
 420   case XGUI::CustomGradientBackground:
 421     // NOT IMPLEMENTED YET
 422     break;
 423   default:
 424     break;
 425   }
 426   // VSR: In OCCT before v6.5.3 below code can't be used because of very ugly bug - it has been impossible to
 427   // clear the background texture image as soon as it was once set to the viewer.
 428   if (myBackground.isTextureShown()) {
 429     QString fileName;
 430     int textureMode = myBackground.texture(fileName);
 431     QFileInfo fi(fileName);
 432     if (!fileName.isEmpty() && fi.exists()) {
 433       // set texture image: file name and fill mode
 434       switch(textureMode) {
 435       case XGUI::CenterTexture:
 436         activeView()->SetBackgroundImage(fi.absoluteFilePath().toLatin1().constData(),
 437                                          Aspect_FM_CENTERED);
 438         break;
 439       case XGUI::TileTexture:
 440         activeView()->SetBackgroundImage(fi.absoluteFilePath().toLatin1().constData(),
 441                                          Aspect_FM_TILED);
 442         break;
 443       case XGUI::StretchTexture:
 444         activeView()->SetBackgroundImage(fi.absoluteFilePath().toLatin1().constData(),
 445                                          Aspect_FM_STRETCH);
 446         break;
 447       default:
 448         break;
 449       }
 450       activeView()->Update();
 451     }
 452   }
 453 }
 454
 455 //***********************************************
 456 void XGUI_ViewPort::attachWindow(const Handle(V3d_View)& theView,
 457                                  const Handle(Aspect_Window)& theWnd)
 458 {
 459   if (!theView.IsNull()) {
 460     theView->SetWindow(theWnd);
 461     updateBackground();
 462   }
 463 }
 464
 465 //***********************************************
 466 void XGUI_ViewPort::paintEvent(QPaintEvent* theEvent)
 467 {
 468 #ifndef WIN32
 469   /* X11 : map before show doesn't work */
 470   if ( !mapped( activeView() ) )
 471   mapView( activeView() );
 472 #endif
 473   if (!myWindow.IsNull()) {
 474     //QGuiApplication::sync();
 475     QRect rc = theEvent->rect();
 476     //if ( !myPaintersRedrawing ) {
 477     //activeView()->Redraw();
 478     activeView()->Redraw(rc.x(), rc.y(), rc.width(), rc.height());
 479     emit vpUpdated();
 480     //}
 481   }
 482   //if ( myPaintersRedrawing ) {
 483   //    QPainter p( this );
 484   //    //emit vpDrawExternal( &p );
 485   //    myPaintersRedrawing = false;
 486   //}
 487 }
 488
 489 //***********************************************
 490 void XGUI_ViewPort::resizeEvent(QResizeEvent*)
 491 {
 492 #ifdef WIN32
 493   /* Win32 : map before first show to avoid flicker */
 494   if (!mapped(activeView()))
 495     mapView(activeView());
 496 #endif
 497   //QGuiApplication::sync();
 498   if (!activeView().IsNull())
 499     activeView()->MustBeResized();
 500 }
 501
 502 //***********************************************
 503 QImage XGUI_ViewPort::dumpView(QRect theRect, bool toUpdate)
 504 {
 505   Handle(V3d_View) view = getView();
 506   if (view.IsNull())
 507     return QImage();
 508
 509   int aWidth;
 510   int aHeight;
 511   if (theRect.isNull()) {
 512     aWidth = width();
 513     aHeight = height();
 514   } else {
 515     aWidth = theRect.width();
 516     aHeight = theRect.height();
 517   }
 518   //QApplication::syncX();
 519
 520   OpenGLUtils_FrameBuffer aFrameBuffer;
 521   if (aFrameBuffer.init(aWidth, aHeight)) {
 522     QImage anImage(aWidth, aHeight, QImage::Format_RGB32);
 523
 524     glPushAttrib (GL_VIEWPORT_BIT);
 525     glViewport(0, 0, aWidth, aHeight);
 526     aFrameBuffer.bind();
 527
 528     // draw scene
 529     if (toUpdate) {
 530       if (theRect.isNull())
 531         view->Redraw();
 532       else
 533         view->Redraw(theRect.x(), theRect.y(), theRect.width(), theRect.height());
 534     }
 535     aFrameBuffer.unbind();
 536     glPopAttrib();
 537
 538     aFrameBuffer.bind();
 539     if (theRect.isNull())
 540       glReadPixels(0, 0, aWidth, aHeight, GL_RGBA, GL_UNSIGNED_BYTE, anImage.bits());
 541     else
 542       glReadPixels(theRect.x(), theRect.y(), aWidth, aHeight, GL_RGBA, GL_UNSIGNED_BYTE,
 543                    anImage.bits());
 544     aFrameBuffer.unbind();
 545
 546     anImage = anImage.rgbSwapped();
 547     anImage = anImage.mirrored();
 548     return anImage;
 549   }
 550   // if frame buffers are unsupported, use old functionality
 551   unsigned char* data = new unsigned char[aWidth * aHeight * 4];
 552
 553   QPoint p;
 554   if (theRect.isNull()) {
 555     if (toUpdate)
 556       view->Redraw();
 557     p = mapFromParent(geometry().topLeft());
 558   } else {
 559     if (toUpdate)
 560       view->Redraw(theRect.x(), theRect.y(), theRect.width(), theRect.height());
 561     p = theRect.topLeft();
 562   }
 563   glReadPixels(p.x(), p.y(), aWidth, aHeight, GL_RGBA, GL_UNSIGNED_BYTE, data);
 564
 565   QImage anImage(data, aWidth, aHeight, QImage::Format_ARGB32);
 566   anImage = anImage.mirrored();
 567   anImage = anImage.rgbSwapped();
 568   return anImage;
 569 }
 570
 571 /*!
 572  Inits 'rotation' transformation.
 573  */
 574 void XGUI_ViewPort::startRotation(int x, int y, int theRotationPointType,
 575                                   const gp_Pnt& theSelectedPoint)
 576 {
 577   if (!activeView().IsNull()) {
 578     switch(theRotationPointType) {
 579     case XGUI::GRAVITY:
 580       activeView()->StartRotation(x, y, 0.45);
 581       break;
 582     case XGUI::SELECTED:
 583       sx = x;
 584       sy = y;
 585
 586       double X, Y;
 587       activeView()->Size(X, Y);
 588       rx = Standard_Real(activeView()->Convert(X));
 589       ry = Standard_Real(activeView()->Convert(Y));
 590
 591       activeView()->Rotate(0., 0., 0., theSelectedPoint.X(), theSelectedPoint.Y(),
 592                            theSelectedPoint.Z(),
 593                            Standard_True);
 594
 595       Quantity_Ratio zRotationThreshold;
 596       zRotation = Standard_False;
 597       zRotationThreshold = 0.45;
 598       if (zRotationThreshold > 0.) {
 599         Standard_Real dx = Abs(sx - rx / 2.);
 600         Standard_Real dy = Abs(sy - ry / 2.);
 601         Standard_Real dd = zRotationThreshold * (rx + ry) / 2.;
 602         if (dx > dd || dy > dd)
 603           zRotation = Standard_True;
 604       }
 605       break;
 606     default:
 607       break;
 608     }
 609     activeView()->DepthFitAll();
 610   }
 611 }
 612
 613 /*!
 614  Rotates the viewport.
 615  */
 616 void XGUI_ViewPort::rotate(int x, int y, int theRotationPointType, const gp_Pnt& theSelectedPoint)
 617 {
 618   if (!activeView().IsNull()) {
 619     switch(theRotationPointType) {
 620     case XGUI::GRAVITY:
 621       activeView()->Rotation(x, y);
 622       break;
 623     case XGUI::SELECTED:
 624       double dx, dy, dz;
 625       if (zRotation) {
 626         dz = atan2(Standard_Real(x) - rx / 2., ry / 2. - Standard_Real(y))
 627             - atan2(sx - rx / 2., ry / 2. - sy);
 628         dx = dy = 0.;
 629       } else {
 630         dx = (Standard_Real(x) - sx) * M_PI / rx;
 631         dy = (sy - Standard_Real(y)) * M_PI / ry;
 632         dz = 0.;
 633       }
 634
 635       activeView()->Rotate(dx, dy, dz, theSelectedPoint.X(), theSelectedPoint.Y(),
 636                            theSelectedPoint.Z(),
 637                            Standard_False);
 638       break;
 639     default:
 640       break;
 641     }
 642     emit vpTransformed();
 643   }
 644   //  setZSize( getZSize() );
 645 }
 646
 647 /*!
 648  Resets the viewport after 'rotation'.
 649  */
 650 void XGUI_ViewPort::endRotation()
 651 {
 652   if (!activeView().IsNull()) {
 653     activeView()->ZFitAll(1.);
 654     activeView()->SetZSize(0.);
 655     activeView()->Update();
 656     emit vpTransformed();
 657   }
 658 }
 659
 660 /*!
 661  Inits 'zoom' transformation.
 662  */
 663 void XGUI_ViewPort::startZoomAtPoint(int x, int y)
 664 {
 665   if (!activeView().IsNull()/* && isAdvancedZoomingEnabled() */)
 666     activeView()->StartZoomAtPoint(x, y);
 667 }
 668
 669 /*!
 670  Centers the viewport.
 671  */
 672 void XGUI_ViewPort::setCenter(int x, int y)
 673 {
 674   if (!activeView().IsNull()) {
 675     activeView()->Place(x, y, myScale);
 676     emit vpTransformed();
 677   }
 678 }
 679
 680 /*!
 681  Called at 'pan' transformation.
 682  */
 683 void XGUI_ViewPort::pan(int dx, int dy)
 684 {
 685   if (!activeView().IsNull()) {
 686     activeView()->Pan(dx, dy, 1.0);
 687     emit vpTransformed();
 688   }
 689 }
 690
 691 /*!
 692  Called at 'window fit' transformation.
 693  */
 694 void XGUI_ViewPort::fitRect(const QRect& rect)
 695 {
 696   if (!activeView().IsNull()) {
 697     activeView()->WindowFit(rect.left(), rect.top(), rect.right(), rect.bottom());
 698     emit vpTransformed();
 699   }
 700 }
 701
 702 /*!
 703  Called at 'zoom' transformation.
 704  */
 705 void XGUI_ViewPort::zoom(int x0, int y0, int x, int y)
 706 {
 707   if (!activeView().IsNull()) {
 708     if (isAdvancedZoomingEnabled())
 709       activeView()->ZoomAtPoint(x0, y0, x, y);
 710     else
 711       activeView()->Zoom(x0 + y0, 0, x + y, 0);
 712     emit vpTransformed();
 713   }
 714 }
 715
 716 /*!
 717  Sets the background data
 718  */
 719 void XGUI_ViewPort::setBackground(const XGUI_ViewBackground& bgData)
 720 {
 721   if (bgData.isValid()) {
 722     myBackground = bgData;
 723     updateBackground();
 724     emit vpChangeBackground(myBackground);
 725   }
 726 }
 727
 728 void XGUI_ViewPort::fitAll(bool theKeepScale, bool theWithZ, bool theUpd)
 729 {
 730   if ( activeView().IsNull() )
 731     return;
 732
 733   if ( theKeepScale )
 734     myScale = activeView()->Scale();
 735
 736   Standard_Real aMargin = 0.01;
 737   activeView()->FitAll( aMargin, theWithZ, theUpd );
 738   activeView()->SetZSize(0.);
 739   emit vpTransformed( );
 740 }
 741
 742 void XGUI_ViewPort::syncronizeWith( const XGUI_ViewPort* ref )
 743 {
 744   Handle(V3d_View) refView = ref->getView();
 745   Handle(V3d_View) tgtView = getView();
 746
 747   /*  The following params are copied:
 748       - view type( ortho/persp )
 749       - position of view point
 750       - orientation of high point
 751       - position of the eye
 752       - projection vector
 753       - view center ( 2D )
 754       - view twist
 755       - view scale
 756   */
 757
 758   /* we'll update after setting all params */
 759   tgtView->SetImmediateUpdate( Standard_False );
 760
 761   /* perspective */
 762   if ( refView->Type() == V3d_PERSPECTIVE )
 763     tgtView->SetFocale( refView->Focale() );
 764
 765   /* copy params */
 766   Standard_Real x, y, z;
 767   refView->At( x, y, z ); tgtView->SetAt( x, y, z );
 768   refView->Up( x, y, z ); tgtView->SetUp( x, y, z );
 769   refView->Eye( x, y, z ); tgtView->SetEye( x, y, z );
 770   refView->Proj( x, y, z ); tgtView->SetProj( x, y, z );
 771   refView->Center( x, y ); tgtView->SetCenter( x, y );
 772   tgtView->SetScale( refView->Scale() );
 773   tgtView->SetTwist( refView->Twist() );
 774
 775   /* update */
 776   tgtView->Update();
 777   tgtView->SetImmediateUpdate( Standard_True );
 778 }