src/cocoa/dcmemory.mm

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/cocoa/dcmemory.mm
   3 // Purpose:     wxMemoryDC class
   4 // Author:      David Elliott
   5 // Modified by:
   6 // Created:     2003/03/16
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2002 David Elliott
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/dcmemory.h"
  13 #include "wx/log.h"
  14
  15 #import <AppKit/NSImage.h>
  16 #import <AppKit/NSAffineTransform.h>
  17 #import <AppKit/NSGraphicsContext.h>
  18
  19 //-----------------------------------------------------------------------------
  20 // wxMemoryDC
  21 //-----------------------------------------------------------------------------
  22
  23 IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC,wxDC)
  24
  25 wxMemoryDC::wxMemoryDC(void)
  26 {
  27     m_cocoaNSImage = NULL;
  28     m_ok = false;
  29 }
  30
  31 wxMemoryDC::wxMemoryDC( wxDC *WXUNUSED(dc) )
  32 {
  33     m_cocoaNSImage = NULL;
  34     m_ok = false;
  35 }
  36
  37 wxMemoryDC::~wxMemoryDC(void)
  38 {
  39     CocoaUnwindStackAndLoseFocus();
  40     [m_cocoaNSImage release];
  41 }
  42
  43 bool wxMemoryDC::CocoaLockFocus()
  44 {
  45     if(m_cocoaNSImage)
  46     {
  47         [m_cocoaNSImage lockFocus];
  48         sm_cocoaDCStack.Insert(this);
  49         m_cocoaFlipped = [m_cocoaNSImage isFlipped];
  50         m_cocoaHeight = [m_cocoaNSImage size].height;
  51         CocoaApplyTransformations();
  52         return true;
  53     }
  54     return false;
  55 }
  56
  57 bool wxMemoryDC::CocoaUnlockFocus()
  58 {
  59     [m_cocoaNSImage unlockFocus];
  60     return true;
  61 }
  62
  63 // NOTE: The AppKit is unable to draw onto an NSBitmapImageRep so we must
  64 // instead copy the data to an offscreen window, then copy it back
  65 void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
  66 {
  67     if(m_selectedBitmap.Ok())
  68     {
  69         CocoaTakeFocus();
  70         wxASSERT(m_cocoaNSImage);
  71         m_selectedBitmap.SetNSBitmapImageRep(
  72             [[NSBitmapImageRep alloc]
  73                 initWithFocusedViewRect:NSMakeRect(0.0,0.0,
  74                     m_selectedBitmap.GetWidth(),
  75                     m_selectedBitmap.GetHeight())]);
  76     }
  77     CocoaUnwindStackAndLoseFocus();
  78     [m_cocoaNSImage release];
  79     m_cocoaNSImage = nil;
  80     m_selectedBitmap = bitmap;
  81     if(m_selectedBitmap.Ok())
  82     {
  83         // Create an offscreen window of the same size
  84         m_cocoaNSImage = [[NSImage alloc]
  85                 initWithSize:NSMakeSize(m_selectedBitmap.GetWidth(),
  86                     m_selectedBitmap.GetHeight())];
  87
  88         // Now copy the data
  89         NSImage *nsimage = [[NSImage alloc]
  90                 initWithSize:NSMakeSize(m_selectedBitmap.GetWidth(),
  91                     m_selectedBitmap.GetHeight())];
  92         [nsimage addRepresentation: const_cast<wxBitmap&>(m_selectedBitmap).GetNSBitmapImageRep()];
  93         [m_cocoaNSImage lockFocus];
  94         [nsimage drawAtPoint: NSMakePoint(0,0)
  95             fromRect: NSMakeRect(0.0,0.0,m_selectedBitmap.GetWidth(),m_selectedBitmap.GetHeight())
  96             operation: NSCompositeCopy
  97             fraction: 1.0];
  98         [m_cocoaNSImage unlockFocus];
  99
 100         [nsimage release];
 101     }
 102 }
 103
 104 void wxMemoryDC::DoGetSize( int *width, int *height ) const
 105 {
 106     if(width)
 107         *width = m_selectedBitmap.GetWidth();
 108     if(height)
 109         *height = m_selectedBitmap.GetHeight();
 110 }
 111
 112 bool wxMemoryDC::CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
 113     wxCoord width, wxCoord height, wxCoord xsrc, wxCoord ysrc,
 114     int logicalFunc, bool useMask, wxCoord xsrcMask, wxCoord ysrcMask)
 115 {
 116     if(!m_selectedBitmap.Ok())
 117         return false;
 118
 119     NSAffineTransform *transform = [NSAffineTransform transform];
 120     [transform translateXBy:xdest yBy:ydest];
 121
 122     NSAffineTransform *flipTransform = [NSAffineTransform transform];
 123     /*  x' = 1x + 0y + 0
 124         y' = 0x + -1y + window's height
 125     */
 126     NSAffineTransformStruct matrix = {
 127         1,  0
 128     ,   0, -1
 129     ,   0, height
 130     };
 131     [flipTransform setTransformStruct: matrix];
 132
 133     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 134     [context saveGraphicsState];
 135     [transform concat];
 136     [flipTransform concat];
 137
 138     wxLogDebug("[m_cocoaNSImage isFlipped]=%d", [m_cocoaNSImage isFlipped]);
 139     [m_cocoaNSImage drawAtPoint: NSMakePoint(0,0)
 140         fromRect: NSMakeRect(xsrc,
 141             m_selectedBitmap.GetHeight()-height-ysrc,
 142             width, height)
 143         operation: NSCompositeCopy // FIXME: raster ops
 144         fraction: 1.0];
 145
 146     [context restoreGraphicsState];
 147     return false;
 148 }
 149