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_CARBON
  34     CGRect cgbounds ;
  35     cgbounds = CGDisplayBounds(CGMainDisplayID());
  36     m_width = (wxCoord)cgbounds.size.width;
  37     m_height = (wxCoord)cgbounds.size.height;
  38 #else
  39     wxDisplaySize( &m_width, &m_height );
  40 #endif
  41 #if wxOSX_USE_COCOA_OR_IPHONE
  42     SetGraphicsContext( wxGraphicsContext::Create() );
  43 #else
  44     Rect bounds;
  45     bounds.top = (short)cgbounds.origin.y;
  46     bounds.left = (short)cgbounds.origin.x;
  47     bounds.bottom = bounds.top + (short)cgbounds.size.height;
  48     bounds.right = bounds.left  + (short)cgbounds.size.width;
  49     WindowAttributes overlayAttributes  = kWindowIgnoreClicksAttribute;
  50     CreateNewWindow( kOverlayWindowClass, overlayAttributes, &bounds, (WindowRef*) &m_overlayWindow );
  51     ShowWindow((WindowRef)m_overlayWindow);
  52     SetGraphicsContext( wxGraphicsContext::CreateFromNativeWindow( m_overlayWindow ) );
  53 #endif
  54     m_ok = true ;
  55 }
  56
  57 wxScreenDCImpl::~wxScreenDCImpl()
  58 {
  59     delete m_graphicContext;
  60     m_graphicContext = NULL;
  61 #if wxOSX_USE_COCOA_OR_IPHONE
  62 #else
  63     DisposeWindow((WindowRef) m_overlayWindow );
  64 #endif
  65 }
  66
  67 #if wxOSX_USE_IPHONE
  68 // Apple has allowed usage of this API as of 15th Dec 2009w
  69 extern CGImageRef UIGetScreenImage();
  70 #endif
  71
  72 // TODO Switch to CGWindowListCreateImage for 10.5 and above
  73
  74 wxBitmap wxScreenDCImpl::DoGetAsBitmap(const wxRect *subrect) const
  75 {
  76     wxRect rect = subrect ? *subrect : wxRect(0, 0, m_width, m_height);
  77
  78     wxBitmap bmp(rect.GetSize(), 32);
  79
  80 #if !wxOSX_USE_IPHONE
  81     CGRect srcRect = CGRectMake(rect.x, rect.y, rect.width, rect.height);
  82
  83     CGContextRef context = (CGContextRef)bmp.GetHBITMAP();
  84
  85     CGContextSaveGState(context);
  86
  87     CGContextTranslateCTM( context, 0,  m_height );
  88     CGContextScaleCTM( context, 1, -1 );
  89
  90     if ( subrect )
  91         srcRect = CGRectOffset( srcRect, -subrect->x, -subrect->y ) ;
  92
  93     CGImageRef image = grabViaOpenGL(kCGNullDirectDisplay, srcRect);
  94
  95     wxASSERT_MSG(image, wxT("wxScreenDC::GetAsBitmap - unable to get screenshot."));
  96
  97     CGContextDrawImage(context, srcRect, image);
  98
  99     CGImageRelease(image);
 100
 101     CGContextRestoreGState(context);
 102 #else
 103     // TODO implement using UIGetScreenImage, CGImageCreateWithImageInRect, CGContextDrawImage
 104 #endif
 105     return bmp;
 106 }