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:     wxWidgets licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13 #ifndef WX_PRECOMP
  14     #include "wx/log.h"
  15     #include "wx/dcmemory.h"
  16 #endif //WX_PRECOMP
  17
  18 #include "wx/cocoa/autorelease.h"
  19
  20 #import <AppKit/NSImage.h>
  21 #import <AppKit/NSAffineTransform.h>
  22 #import <AppKit/NSGraphicsContext.h>
  23
  24 //-----------------------------------------------------------------------------
  25 // wxMemoryDC
  26 //-----------------------------------------------------------------------------
  27
  28 IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC,wxDC)
  29
  30 wxMemoryDC::wxMemoryDC(void)
  31 {
  32     m_cocoaNSImage = NULL;
  33     m_ok = false;
  34 }
  35
  36 wxMemoryDC::wxMemoryDC( wxDC *WXUNUSED(dc) )
  37 {
  38     m_cocoaNSImage = NULL;
  39     m_ok = false;
  40 }
  41
  42 wxMemoryDC::~wxMemoryDC(void)
  43 {
  44     CocoaUnwindStackAndLoseFocus();
  45     [m_cocoaNSImage release];
  46 }
  47
  48 bool wxMemoryDC::CocoaLockFocus()
  49 {
  50     if(m_cocoaNSImage)
  51     {
  52         [m_cocoaNSImage lockFocus];
  53         sm_cocoaDCStack.Insert(this);
  54         m_cocoaFlipped = [m_cocoaNSImage isFlipped];
  55         m_cocoaHeight = [m_cocoaNSImage size].height;
  56         CocoaApplyTransformations();
  57         return true;
  58     }
  59     return false;
  60 }
  61
  62 bool wxMemoryDC::CocoaUnlockFocus()
  63 {
  64     [m_cocoaNSImage unlockFocus];
  65     return true;
  66 }
  67
  68 // NOTE: The AppKit is unable to draw onto an NSBitmapImageRep so we must
  69 // instead copy the data to an offscreen window, then copy it back
  70 void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
  71 {
  72     wxAutoNSAutoreleasePool pool;
  73     if(m_selectedBitmap.Ok())
  74     {
  75         CocoaTakeFocus();
  76         wxASSERT(m_cocoaNSImage);
  77         m_selectedBitmap.SetNSBitmapImageRep(
  78             [[NSBitmapImageRep alloc]
  79                 initWithFocusedViewRect:NSMakeRect(0.0,0.0,
  80                     m_selectedBitmap.GetWidth(),
  81                     m_selectedBitmap.GetHeight())]);
  82     }
  83     CocoaUnwindStackAndLoseFocus();
  84     [m_cocoaNSImage release];
  85     m_cocoaNSImage = nil;
  86     m_selectedBitmap = bitmap;
  87     if(m_selectedBitmap.Ok())
  88     {
  89         // Create an offscreen window of the same size
  90         m_cocoaNSImage = [[NSImage alloc]
  91                 initWithSize:NSMakeSize(m_selectedBitmap.GetWidth(),
  92                     m_selectedBitmap.GetHeight())];
  93
  94         // Now copy the data
  95         NSImage *nsimage = [m_selectedBitmap.GetNSImage(false) retain];
  96         [m_cocoaNSImage lockFocus];
  97         [nsimage drawAtPoint: NSMakePoint(0,0)
  98             fromRect: NSMakeRect(0.0,0.0,m_selectedBitmap.GetWidth(),m_selectedBitmap.GetHeight())
  99             operation: NSCompositeCopy
 100             fraction: 1.0];
 101         [m_cocoaNSImage unlockFocus];
 102
 103         [nsimage release];
 104     }
 105 }
 106
 107 void wxMemoryDC::DoGetSize( int *width, int *height ) const
 108 {
 109     if(width)
 110         *width = m_selectedBitmap.GetWidth();
 111     if(height)
 112         *height = m_selectedBitmap.GetHeight();
 113 }
 114
 115 bool wxMemoryDC::CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
 116     wxCoord width, wxCoord height, wxCoord xsrc, wxCoord ysrc,
 117     int logicalFunc, bool useMask, wxCoord xsrcMask, wxCoord ysrcMask)
 118 {
 119     if(!m_selectedBitmap.Ok())
 120         return false;
 121
 122     NSAffineTransform *transform = [NSAffineTransform transform];
 123     [transform translateXBy:xdest yBy:ydest];
 124
 125     NSAffineTransform *flipTransform = [NSAffineTransform transform];
 126     /*  x' = 1x + 0y + 0
 127         y' = 0x + -1y + window's height
 128     */
 129     NSAffineTransformStruct matrix = {
 130         1,  0
 131     ,   0, -1
 132     ,   0, height
 133     };
 134     [flipTransform setTransformStruct: matrix];
 135
 136     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 137     [context saveGraphicsState];
 138     [transform concat];
 139     [flipTransform concat];
 140
 141     wxLogTrace(wxTRACE_COCOA,wxT("[m_cocoaNSImage isFlipped]=%d"), [m_cocoaNSImage isFlipped]);
 142     [m_cocoaNSImage drawAtPoint: NSMakePoint(0,0)
 143         fromRect: NSMakeRect(xsrc,
 144             m_selectedBitmap.GetHeight()-height-ysrc,
 145             width, height)
 146         operation: NSCompositeCopy // FIXME: raster ops
 147         fraction: 1.0];
 148
 149     [context restoreGraphicsState];
 150     return false;
 151 }
 152