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