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
  14 #ifndef WX_PRECOMP
  15     #include "wx/log.h"
  16     #include "wx/dcmemory.h"
  17 #endif //WX_PRECOMP
  18
  19 #include "wx/cocoa/autorelease.h"
  20
  21 #import <AppKit/NSImage.h>
  22 #import <AppKit/NSAffineTransform.h>
  23 #import <AppKit/NSGraphicsContext.h>
  24 #import <AppKit/NSColor.h>
  25 #import <AppKit/NSBezierPath.h>
  26
  27 //-----------------------------------------------------------------------------
  28 // wxMemoryDC
  29 //-----------------------------------------------------------------------------
  30
  31 IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC,wxDC)
  32
  33 wxMemoryDC::wxMemoryDC(void)
  34 {
  35     m_cocoaNSImage = NULL;
  36     m_ok = false;
  37 }
  38
  39 wxMemoryDC::wxMemoryDC( wxDC *WXUNUSED(dc) )
  40 {
  41     m_cocoaNSImage = NULL;
  42     m_ok = false;
  43 }
  44
  45 wxMemoryDC::~wxMemoryDC(void)
  46 {
  47     CocoaUnwindStackAndLoseFocus();
  48     [m_cocoaNSImage release];
  49 }
  50
  51 bool wxMemoryDC::CocoaLockFocus()
  52 {
  53     if(m_cocoaNSImage)
  54     {
  55         [m_cocoaNSImage lockFocus];
  56         sm_cocoaDCStack.Insert(this);
  57         NSAffineTransform *newTransform = CocoaGetWxToBoundsTransform([m_cocoaNSImage isFlipped], [m_cocoaNSImage size].height);
  58         [newTransform retain];
  59         [m_cocoaWxToBoundsTransform release];
  60         m_cocoaWxToBoundsTransform = newTransform;
  61         CocoaApplyTransformations();
  62         return true;
  63     }
  64     return false;
  65 }
  66
  67 bool wxMemoryDC::CocoaUnlockFocus()
  68 {
  69     [m_cocoaNSImage unlockFocus];
  70     return true;
  71 }
  72
  73 // NOTE: The AppKit is unable to draw onto an NSBitmapImageRep so we must
  74 // instead copy the data to an offscreen window, then copy it back
  75 void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
  76 {
  77     wxAutoNSAutoreleasePool pool;
  78     if(m_selectedBitmap.Ok())
  79     {
  80         CocoaTakeFocus();
  81         wxASSERT(m_cocoaNSImage);
  82         m_selectedBitmap.SetNSBitmapImageRep(
  83             [[NSBitmapImageRep alloc]
  84                 initWithFocusedViewRect:NSMakeRect(0.0,0.0,
  85                     m_selectedBitmap.GetWidth(),
  86                     m_selectedBitmap.GetHeight())]);
  87     }
  88     CocoaUnwindStackAndLoseFocus();
  89     [m_cocoaNSImage release];
  90     m_cocoaNSImage = nil;
  91     m_selectedBitmap = bitmap;
  92     if(m_selectedBitmap.Ok())
  93     {
  94         // Create an offscreen window of the same size
  95         m_cocoaNSImage = [[NSImage alloc]
  96                 initWithSize:NSMakeSize(m_selectedBitmap.GetWidth(),
  97                     m_selectedBitmap.GetHeight())];
  98
  99         // Now copy the data
 100         NSImage *nsimage = [m_selectedBitmap.GetNSImage(false) retain];
 101         [m_cocoaNSImage lockFocus];
 102         [nsimage drawAtPoint: NSMakePoint(0,0)
 103             fromRect: NSMakeRect(0.0,0.0,m_selectedBitmap.GetWidth(),m_selectedBitmap.GetHeight())
 104             operation: NSCompositeCopy
 105             fraction: 1.0];
 106         [m_cocoaNSImage unlockFocus];
 107
 108         [nsimage release];
 109     }
 110 }
 111
 112 void wxMemoryDC::DoGetSize( int *width, int *height ) const
 113 {
 114     if(width)
 115         *width = m_selectedBitmap.GetWidth();
 116     if(height)
 117         *height = m_selectedBitmap.GetHeight();
 118 }
 119
 120 bool wxMemoryDC::CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
 121     wxCoord width, wxCoord height, wxCoord xsrc, wxCoord ysrc,
 122     int logicalFunc, bool useMask, wxCoord xsrcMask, wxCoord ysrcMask)
 123 {
 124     if(!m_selectedBitmap.Ok())
 125         return false;
 126
 127     NSAffineTransform *transform = [NSAffineTransform transform];
 128     [transform translateXBy:xdest yBy:ydest];
 129
 130     NSAffineTransform *flipTransform = [NSAffineTransform transform];
 131     /*  x' = 1x + 0y + 0
 132         y' = 0x + -1y + window's height
 133     */
 134     NSAffineTransformStruct matrix = {
 135         1,  0
 136     ,   0, -1
 137     ,   0, height
 138     };
 139     [flipTransform setTransformStruct: matrix];
 140
 141     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 142     [context saveGraphicsState];
 143     [transform concat];
 144     [flipTransform concat];
 145
 146     wxLogTrace(wxTRACE_COCOA,wxT("[m_cocoaNSImage isFlipped]=%d"), [m_cocoaNSImage isFlipped]);
 147     [m_cocoaNSImage drawAtPoint: NSMakePoint(0,0)
 148         fromRect: NSMakeRect(xsrc,
 149             m_selectedBitmap.GetHeight()-height-ysrc,
 150             width, height)
 151         operation: NSCompositeCopy // FIXME: raster ops
 152         fraction: 1.0];
 153
 154     [context restoreGraphicsState];
 155     return false;
 156 }
 157
 158 bool wxMemoryDC::CocoaGetBounds(void *rectData)
 159 {
 160     if(!rectData)
 161         return false;
 162     if(!m_cocoaNSImage)
 163         return false;
 164     NSRect *pRect = (NSRect*)rectData;
 165     pRect->origin.x = 0.0;
 166     pRect->origin.y = 0.0;
 167     pRect->size = [m_cocoaNSImage size];
 168     return true;
 169 }
 170