src/mac/carbon/dcmemory.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/mac/carbon/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/graphics.h"
  16
  17 #include "wx/mac/private.h"
  18
  19 //-----------------------------------------------------------------------------
  20 // wxMemoryDC
  21 //-----------------------------------------------------------------------------
  22
  23 IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC,wxPaintDC)
  24
  25 wxMemoryDC::wxMemoryDC( const wxBitmap& bitmap )
  26 : m_selected()
  27 {
  28     m_ok = true;
  29     SetBackground(*wxWHITE_BRUSH);
  30     SetBrush(*wxWHITE_BRUSH);
  31     SetPen(*wxBLACK_PEN);
  32     SetFont(*wxNORMAL_FONT);
  33     m_ok = false;
  34
  35     if ( bitmap.IsOk() )
  36         SelectObject(bitmap);
  37 }
  38
  39 wxMemoryDC::wxMemoryDC( wxDC *WXUNUSED(dc) )
  40 : m_selected()
  41 {
  42     m_ok = true;
  43     SetBackground(*wxWHITE_BRUSH);
  44     SetBrush(*wxWHITE_BRUSH);
  45     SetPen(*wxBLACK_PEN);
  46     SetFont(*wxNORMAL_FONT);
  47     m_ok = false;
  48 }
  49
  50 wxMemoryDC::~wxMemoryDC()
  51 {
  52     if ( m_selected.Ok() )
  53     {
  54 #if wxMAC_USE_CORE_GRAPHICS
  55         m_selected.EndRawAccess() ;
  56         CGContextRef bmCtx = (CGContextRef) m_graphicContext->GetNativeContext() ;
  57         delete m_graphicContext ;
  58         m_graphicContext = NULL ;
  59         CGContextRelease( bmCtx ) ;
  60 #else
  61 // TODO: UnlockPixels( GetGWorldPixMap(MAC_WXHBITMAP(m_selected.GetHBITMAP())) );
  62 #endif
  63     }
  64 }
  65
  66 void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
  67 {
  68     if ( m_selected.Ok() )
  69     {
  70 #if wxMAC_USE_CORE_GRAPHICS
  71         m_selected.EndRawAccess() ;
  72         CGContextRef bmCtx = (CGContextRef) m_graphicContext->GetNativeContext() ;
  73         delete m_graphicContext ;
  74         m_graphicContext = NULL ;
  75         CGContextRelease( bmCtx ) ;
  76 #else
  77 // TODO: UnlockPixels( GetGWorldPixMap(MAC_WXHBITMAP(m_selected.GetHBITMAP())) );
  78 #endif
  79     }
  80
  81     m_selected = bitmap;
  82     if (m_selected.Ok())
  83     {
  84 #if wxMAC_USE_CORE_GRAPHICS
  85         if ( m_selected.GetDepth() != 1 )
  86             m_selected.UseAlpha() ;
  87         void * data = m_selected.BeginRawAccess() ;
  88
  89         int bitsPerComp = 8 ;
  90         int bytesPerPixel = 4 ;
  91         int w = bitmap.GetWidth() ;
  92         int h = bitmap.GetHeight() ;
  93                 m_width = w;
  94                 m_height = h;
  95
  96         // TODO: should this be kCGImageAlphaPremultiplied[First,Last] ?
  97         CGImageAlphaInfo a = kCGImageAlphaNoneSkipFirst ;
  98
  99         CGColorSpaceRef genericColorSpace  = wxMacGetGenericRGBColorSpace();
 100         CGContextRef bmCtx = CGBitmapContextCreate( data , w, h, bitsPerComp , bytesPerPixel * w , genericColorSpace, a );
 101         wxASSERT_MSG( bmCtx , wxT("Unable to create bitmap context") ) ;
 102
 103         if ( bmCtx )
 104         {
 105             CGContextSetFillColorSpace( bmCtx, genericColorSpace );
 106             CGContextSetStrokeColorSpace( bmCtx, genericColorSpace );
 107
 108             CGContextTranslateCTM( bmCtx , 0 ,  m_selected.GetHeight() ) ;
 109             CGContextScaleCTM( bmCtx , 1 , -1 ) ;
 110
 111                         SetGraphicsContext( wxGraphicsContext::CreateFromNative( bmCtx ) );
 112             m_graphicContext->SetPen( m_pen ) ;
 113             m_graphicContext->SetBrush( m_brush ) ;
 114             m_graphicContext->SetFont( m_font , m_textForegroundColour) ;
 115         }
 116         m_ok = (m_graphicContext != NULL) ;
 117
 118 #else
 119         m_macPort = m_selected.GetHBITMAP( &m_macMask ) ;
 120         m_ok = (m_macPort != NULL) ;
 121         if (m_ok)
 122         {
 123             LockPixels( GetGWorldPixMap( (CGrafPtr) m_macPort ) ) ;
 124             SetRectRgn( (RgnHandle) m_macBoundaryClipRgn , 0 , 0 , m_selected.GetWidth() , m_selected.GetHeight() ) ;
 125             CopyRgn( (RgnHandle) m_macBoundaryClipRgn , (RgnHandle) m_macCurrentClipRgn ) ;
 126         }
 127 #endif
 128     }
 129     else
 130     {
 131         m_ok = false;
 132     }
 133 }
 134
 135 void wxMemoryDC::DoGetSize( int *width, int *height ) const
 136 {
 137     if (m_selected.Ok())
 138     {
 139         if (width)
 140             (*width) = m_selected.GetWidth();
 141         if (height)
 142             (*height) = m_selected.GetHeight();
 143     }
 144     else
 145     {
 146         if (width)
 147             (*width) = 0;
 148         if (height)
 149             (*height) = 0;
 150     }
 151 }