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