src/osx/carbon/dcscreen.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/osx/carbon/dcscreen.cpp
   3 // Purpose:     wxScreenDC class
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     1998-01-01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Stefan Csomor
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #include "wx/dcscreen.h"
  15 #include "wx/osx/dcscreen.h"
  16
  17 #include "wx/osx/private.h"
  18 #include "wx/graphics.h"
  19 #if wxOSX_USE_COCOA_OR_CARBON
  20 #include "wx/osx/private/glgrab.h"
  21 #endif
  22
  23 IMPLEMENT_ABSTRACT_CLASS(wxScreenDCImpl, wxWindowDCImpl)
  24
  25 // TODO : for the Screenshot use case, which doesn't work in Quartz
  26 // we should do a GetAsBitmap using something like
  27 // http://www.cocoabuilder.com/archive/message/cocoa/2005/8/13/144256
  28
  29 // Create a DC representing the whole screen
  30 wxScreenDCImpl::wxScreenDCImpl( wxDC *owner ) :
  31    wxWindowDCImpl( owner )
  32 {
  33 #if wxOSX_USE_COCOA_OR_IPHONE
  34     SetGraphicsContext( wxGraphicsContext::Create() );
  35     m_ok = true ;
  36 #else
  37     CGRect cgbounds ;
  38     cgbounds = CGDisplayBounds(CGMainDisplayID());
  39     Rect bounds;
  40     bounds.top = (short)cgbounds.origin.y;
  41     bounds.left = (short)cgbounds.origin.x;
  42     bounds.bottom = bounds.top + (short)cgbounds.size.height;
  43     bounds.right = bounds.left  + (short)cgbounds.size.width;
  44     WindowAttributes overlayAttributes  = kWindowIgnoreClicksAttribute;
  45     CreateNewWindow( kOverlayWindowClass, overlayAttributes, &bounds, (WindowRef*) &m_overlayWindow );
  46     ShowWindow((WindowRef)m_overlayWindow);
  47     SetGraphicsContext( wxGraphicsContext::CreateFromNativeWindow( m_overlayWindow ) );
  48     m_width = (wxCoord)cgbounds.size.width;
  49     m_height = (wxCoord)cgbounds.size.height;
  50     m_ok = true ;
  51 #endif
  52 }
  53
  54 wxScreenDCImpl::~wxScreenDCImpl()
  55 {
  56     delete m_graphicContext;
  57     m_graphicContext = NULL;
  58 #if wxOSX_USE_COCOA_OR_IPHONE
  59 #else
  60     DisposeWindow((WindowRef) m_overlayWindow );
  61 #endif
  62 }
  63
  64 // TODO Switch to CGWindowListCreateImage for 10.5 and above
  65
  66 wxBitmap wxScreenDCImpl::DoGetAsBitmap(const wxRect *subrect) const
  67 {
  68     CGRect srcRect = CGRectMake(0, 0, m_width, m_height);
  69     if (subrect)
  70     {
  71         srcRect.origin.x = subrect->GetX();
  72         srcRect.origin.y = subrect->GetY();
  73         srcRect.size.width = subrect->GetWidth();
  74         srcRect.size.height = subrect->GetHeight();
  75     }
  76     wxBitmap bmp = wxBitmap(srcRect.size.width, srcRect.size.height, 32);
  77 #if wxOSX_USE_IPHONE
  78 #else
  79     CGContextRef context = (CGContextRef)bmp.GetHBITMAP();
  80
  81     CGContextSaveGState(context);
  82
  83     CGContextTranslateCTM( context, 0,  m_height );
  84     CGContextScaleCTM( context, 1, -1 );
  85
  86     if ( subrect )
  87         srcRect = CGRectOffset( srcRect, -subrect->x, -subrect->y ) ;
  88
  89     CGImageRef image = grabViaOpenGL(kCGNullDirectDisplay, srcRect);
  90
  91     wxASSERT_MSG(image, wxT("wxScreenDC::GetAsBitmap - unable to get screenshot."));
  92
  93     CGContextDrawImage(context, srcRect, image);
  94
  95     CGContextRestoreGState(context);
  96 #endif
  97     return bmp;
  98 }