src/mac/carbon/dcmemory.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dcmemory.cpp
   3 // Purpose:     wxMemoryDC class
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Stefan Csomor
   9 // Licence:       wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #include "wx/dcmemory.h"
  15 #include "wx/mac/private.h"
  16
  17 //-----------------------------------------------------------------------------
  18 // wxMemoryDC
  19 //-----------------------------------------------------------------------------
  20
  21 IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC,wxPaintDC)
  22
  23 wxMemoryDC::wxMemoryDC()
  24 : m_selected()
  25 {
  26     m_ok = true;
  27     SetBackground(*wxWHITE_BRUSH);
  28     SetBrush(*wxWHITE_BRUSH);
  29     SetPen(*wxBLACK_PEN);
  30     SetFont(*wxNORMAL_FONT);
  31     m_ok = false;
  32 }
  33
  34 wxMemoryDC::wxMemoryDC( wxDC *WXUNUSED(dc) )
  35 : m_selected()
  36 {
  37     m_ok = true;
  38     SetBackground(*wxWHITE_BRUSH);
  39     SetBrush(*wxWHITE_BRUSH);
  40     SetPen(*wxBLACK_PEN);
  41     SetFont(*wxNORMAL_FONT);
  42     m_ok = false;
  43 }
  44
  45 wxMemoryDC::~wxMemoryDC()
  46 {
  47     if ( m_selected.Ok() )
  48     {
  49 #if wxMAC_USE_CORE_GRAPHICS
  50         m_selected.EndRawAccess() ;
  51         CGContextRef bmCtx = ((wxMacCGContext*)(m_graphicContext))->GetNativeContext() ;
  52         delete m_graphicContext ;
  53         m_graphicContext = NULL ;
  54         CGContextRelease( bmCtx ) ;
  55 #else
  56 // TODO: UnlockPixels( GetGWorldPixMap(MAC_WXHBITMAP(m_selected.GetHBITMAP())) );
  57 #endif
  58     }
  59 }
  60
  61 void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
  62 {
  63     if ( m_selected.Ok() )
  64     {
  65 #if wxMAC_USE_CORE_GRAPHICS
  66         m_selected.EndRawAccess() ;
  67         CGContextRef bmCtx = ((wxMacCGContext*)(m_graphicContext))->GetNativeContext() ;
  68         delete m_graphicContext ;
  69         m_graphicContext = NULL ;
  70         CGContextRelease( bmCtx ) ;
  71 #else
  72 // TODO: UnlockPixels( GetGWorldPixMap(MAC_WXHBITMAP(m_selected.GetHBITMAP())) );
  73 #endif
  74     }
  75
  76     m_selected = bitmap;
  77     if (m_selected.Ok())
  78     {
  79 #if wxMAC_USE_CORE_GRAPHICS
  80         m_selected.UseAlpha() ;
  81         void * data = m_selected.BeginRawAccess() ;
  82
  83         int bitsPerComp = 8 ;
  84         int bytesPerPixel = 4 ;
  85         int w = bitmap.GetWidth() ;
  86         int h = bitmap.GetHeight() ;
  87
  88         // TODO: should this be kCGImageAlphaPremultiplied[First,Last] ?
  89         CGImageAlphaInfo a = kCGImageAlphaNoneSkipFirst ;
  90
  91         CGColorSpaceRef genericColorSpace  = wxMacGetGenericRGBColorSpace();
  92         CGContextRef bmCtx = CGBitmapContextCreate( data , w, h, bitsPerComp , bytesPerPixel * w , genericColorSpace, a );
  93         wxASSERT_MSG( bmCtx , wxT("Unable to create bitmap context") ) ;
  94
  95         if ( bmCtx )
  96         {
  97             CGContextSetFillColorSpace( bmCtx, genericColorSpace );
  98             CGContextSetStrokeColorSpace( bmCtx, genericColorSpace );
  99
 100             CGContextTranslateCTM( bmCtx , 0 ,  m_selected.GetHeight() ) ;
 101             CGContextScaleCTM( bmCtx , 1 , -1 ) ;
 102
 103             m_graphicContext = new wxMacCGContext( bmCtx ) ;
 104             m_graphicContext->SetPen( m_pen ) ;
 105             m_graphicContext->SetBrush( m_brush ) ;
 106         }
 107         m_ok = (m_graphicContext != NULL) ;
 108
 109 #else
 110         m_macPort = m_selected.GetHBITMAP( &m_macMask ) ;
 111         m_ok = (m_macPort != NULL) ;
 112         if (m_ok)
 113         {
 114             LockPixels( GetGWorldPixMap( (CGrafPtr) m_macPort ) ) ;
 115             SetRectRgn( (RgnHandle) m_macBoundaryClipRgn , 0 , 0 , m_selected.GetWidth() , m_selected.GetHeight() ) ;
 116             CopyRgn( (RgnHandle) m_macBoundaryClipRgn , (RgnHandle) m_macCurrentClipRgn ) ;
 117         }
 118 #endif
 119     }
 120     else
 121     {
 122         m_ok = false;
 123     }
 124 }
 125
 126 void wxMemoryDC::DoGetSize( int *width, int *height ) const
 127 {
 128     if (m_selected.Ok())
 129     {
 130         if (width)
 131             (*width) = m_selected.GetWidth();
 132         if (height)
 133             (*height) = m_selected.GetHeight();
 134     }
 135     else
 136     {
 137         if (width)
 138             (*width) = 0;
 139         if (height)
 140             (*height) = 0;
 141     }
 142 }