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         m_cocoaFlipped = [m_cocoaNSImage isFlipped];
  57         m_cocoaHeight = [m_cocoaNSImage size].height;
  58         CocoaApplyTransformations();
  59         return true;
  60     }
  61     return false;
  62 }
  63
  64 bool wxMemoryDC::CocoaUnlockFocus()
  65 {
  66     [m_cocoaNSImage unlockFocus];
  67     return true;
  68 }
  69
  70 // NOTE: The AppKit is unable to draw onto an NSBitmapImageRep so we must
  71 // instead copy the data to an offscreen window, then copy it back
  72 void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
  73 {
  74     wxAutoNSAutoreleasePool pool;
  75     if(m_selectedBitmap.Ok())
  76     {
  77         CocoaTakeFocus();
  78         wxASSERT(m_cocoaNSImage);
  79         m_selectedBitmap.SetNSBitmapImageRep(
  80             [[NSBitmapImageRep alloc]
  81                 initWithFocusedViewRect:NSMakeRect(0.0,0.0,
  82                     m_selectedBitmap.GetWidth(),
  83                     m_selectedBitmap.GetHeight())]);
  84     }
  85     CocoaUnwindStackAndLoseFocus();
  86     [m_cocoaNSImage release];
  87     m_cocoaNSImage = nil;
  88     m_selectedBitmap = bitmap;
  89     if(m_selectedBitmap.Ok())
  90     {
  91         // Create an offscreen window of the same size
  92         m_cocoaNSImage = [[NSImage alloc]
  93                 initWithSize:NSMakeSize(m_selectedBitmap.GetWidth(),
  94                     m_selectedBitmap.GetHeight())];
  95
  96         // Now copy the data
  97         NSImage *nsimage = [m_selectedBitmap.GetNSImage(false) retain];
  98         [m_cocoaNSImage lockFocus];
  99         [nsimage drawAtPoint: NSMakePoint(0,0)
 100             fromRect: NSMakeRect(0.0,0.0,m_selectedBitmap.GetWidth(),m_selectedBitmap.GetHeight())
 101             operation: NSCompositeCopy
 102             fraction: 1.0];
 103         [m_cocoaNSImage unlockFocus];
 104
 105         [nsimage release];
 106     }
 107 }
 108
 109 void wxMemoryDC::DoGetSize( int *width, int *height ) const
 110 {
 111     if(width)
 112         *width = m_selectedBitmap.GetWidth();
 113     if(height)
 114         *height = m_selectedBitmap.GetHeight();
 115 }
 116
 117 bool wxMemoryDC::CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
 118     wxCoord width, wxCoord height, wxCoord xsrc, wxCoord ysrc,
 119     int logicalFunc, bool useMask, wxCoord xsrcMask, wxCoord ysrcMask)
 120 {
 121     if(!m_selectedBitmap.Ok())
 122         return false;
 123
 124     NSAffineTransform *transform = [NSAffineTransform transform];
 125     [transform translateXBy:xdest yBy:ydest];
 126
 127     NSAffineTransform *flipTransform = [NSAffineTransform transform];
 128     /*  x' = 1x + 0y + 0
 129         y' = 0x + -1y + window's height
 130     */
 131     NSAffineTransformStruct matrix = {
 132         1,  0
 133     ,   0, -1
 134     ,   0, height
 135     };
 136     [flipTransform setTransformStruct: matrix];
 137
 138     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 139     [context saveGraphicsState];
 140     [transform concat];
 141     [flipTransform concat];
 142
 143     wxLogTrace(wxTRACE_COCOA,wxT("[m_cocoaNSImage isFlipped]=%d"), [m_cocoaNSImage isFlipped]);
 144     [m_cocoaNSImage drawAtPoint: NSMakePoint(0,0)
 145         fromRect: NSMakeRect(xsrc,
 146             m_selectedBitmap.GetHeight()-height-ysrc,
 147             width, height)
 148         operation: NSCompositeCopy // FIXME: raster ops
 149         fraction: 1.0];
 150
 151     [context restoreGraphicsState];
 152     return false;
 153 }
 154
 155 void wxMemoryDC::Clear()
 156 {
 157     if(!CocoaTakeFocus()) return;
 158
 159     NSGraphicsContext *context = [NSGraphicsContext currentContext];
 160     [context saveGraphicsState];
 161
 162     [m_backgroundBrush.GetNSColor() set];
 163     NSRect rect;
 164     rect.origin.x = 0;
 165     rect.origin.y = 0;
 166     rect.size = [m_cocoaNSImage size];
 167     [NSBezierPath fillRect:rect];
 168
 169     [context restoreGraphicsState];
 170 }
 171