graphics.cpp

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    wxMacCFRefHolder<HIShapeRef> m_clipRgn;
};

//-----------------------------------------------------------------------------
// device context implementation
//
// more and more of the dc functionality should be implemented by calling
// the appropricate wxMacCoreGraphicsContext, but we will have to do that step by step
// also coordinate conversions should be moved to native matrix ops
//-----------------------------------------------------------------------------

// we always stock two context states, one at entry, to be able to preserve the
// state we were called with, the other one after changing to HI Graphics orientation
// (this one is used for getting back clippings etc)

//-----------------------------------------------------------------------------
// wxMacCoreGraphicsContext implementation
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxMacCoreGraphicsContext, wxGraphicsContext)

void wxMacCoreGraphicsContext::Init()
{
    m_cgContext = NULL;
    m_releaseContext = false;
    m_windowRef = NULL;

    HIRect r = CGRectMake(0,0,0,0);
    m_clipRgn.Set(HIShapeCreateWithRect(&r));
}

wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, CGContextRef cgcontext ) : wxGraphicsContext(renderer)
{
    Init();
    SetNativeContext(cgcontext);
}

wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, WindowRef window ): wxGraphicsContext(renderer)
{
    Init();
    m_windowRef = window;
}

wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, wxWindow* window ): wxGraphicsContext(renderer)
{
    Init();
    m_windowRef = (WindowRef) window->MacGetTopLevelWindowRef();
    int originX , originY;
    originX = originY = 0;
    window->MacWindowToRootWindow( &originX , &originY );
    Rect bounds;
    GetWindowBounds( m_windowRef, kWindowContentRgn, &bounds );

    m_windowTransform = CGAffineTransformMakeTranslation( 0 , bounds.bottom - bounds.top );
    m_windowTransform = CGAffineTransformScale( m_windowTransform , 1 , -1 );
    m_windowTransform = CGAffineTransformTranslate( m_windowTransform, originX, originY ) ;
}

wxMacCoreGraphicsContext::wxMacCoreGraphicsContext(wxGraphicsRenderer* renderer) : wxGraphicsContext(renderer)
{
    Init();
}

wxMacCoreGraphicsContext::wxMacCoreGraphicsContext() : wxGraphicsContext(NULL)
{
    Init();
    wxLogDebug(wxT("Illegal Constructor called"));
}

wxMacCoreGraphicsContext::~wxMacCoreGraphicsContext()
{
    SetNativeContext(NULL);
}

void wxMacCoreGraphicsContext::EnsureIsValid()
{
    if ( !m_cgContext )
    {
        OSStatus status = QDBeginCGContext( GetWindowPort( m_windowRef ) , &m_cgContext );
        wxASSERT_MSG( status == noErr , wxT("Cannot nest wxDCs on the same window") );

        CGContextConcatCTM( m_cgContext, m_windowTransform );
		CGContextSaveGState( m_cgContext );
		m_releaseContext = true;
		if ( !HIShapeIsEmpty(m_clipRgn) )
		{
            // the clip region is in device coordinates, so we convert this again to user coordinates
            wxMacCFRefHolder<HIMutableShapeRef> hishape ;
            hishape.Set( HIShapeCreateMutableCopy( m_clipRgn ) );
            CGPoint transformedOrigin = CGPointApplyAffineTransform( CGPointZero,m_windowTransform);
            HIShapeOffset( hishape, -transformedOrigin.x, -transformedOrigin.y );
			HIShapeReplacePathInCGContext( hishape, m_cgContext );
			CGContextClip( m_cgContext );
		}
		CGContextSaveGState( m_cgContext );
	}
}

bool wxMacCoreGraphicsContext::SetLogicalFunction( int function )
{
    if (m_logicalFunction == function)
        return true;

    EnsureIsValid();
    
    bool retval = false;

    if ( function == wxCOPY )
    {
        retval = true;
#if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
        if ( CGContextSetBlendMode != NULL )
        {
            CGContextSetBlendMode( m_cgContext, kCGBlendModeNormal );
            CGContextSetShouldAntialias( m_cgContext, true );
        }
#endif
    }
    else if ( function == wxINVERT || function == wxXOR )
    {
#if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
        if ( CGContextSetBlendMode != NULL )
        {
            // change color to white
            CGContextSetBlendMode( m_cgContext, kCGBlendModeExclusion );
            CGContextSetShouldAntialias( m_cgContext, false );
            retval = true;
        }
#endif
    }
    
    if (retval)
        m_logicalFunction = function;
    return retval ;
}

void wxMacCoreGraphicsContext::Clip( const wxRegion &region )
{
    if( m_cgContext )
    {
        HIShapeRef shape = HIShapeCreateWithQDRgn( (RgnHandle) region.GetWXHRGN() );
        HIShapeReplacePathInCGContext( shape, m_cgContext );
        CGContextClip( m_cgContext );
        CFRelease( shape );
    }
    else
    {
        // this offsetting to device coords is not really correct, but since we cannot apply affine transforms
        // to regions we try at least to have correct translations
        wxMacCFRefHolder<HIShapeRef> hishape ;
        hishape.Set( HIShapeCreateWithQDRgn( (RgnHandle) region.GetWXHRGN() ));
        HIMutableShapeRef mutableShape = HIShapeCreateMutableCopy( hishape );
        
        CGPoint transformedOrigin = CGPointApplyAffineTransform( CGPointZero, m_windowTransform );
        HIShapeOffset( mutableShape, transformedOrigin.x, transformedOrigin.y );
        m_clipRgn.Set(mutableShape);
    }
}

// clips drawings to the rect
void wxMacCoreGraphicsContext::Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
{
    HIRect r = CGRectMake( x , y , w , h );
    if ( m_cgContext )
    {
        CGContextClipToRect( m_cgContext, r );
    }
    else
    {
        // the clipping itself must be stored as device coordinates, otherwise 
        // we cannot apply it back correctly
        r.origin= CGPointApplyAffineTransform( r.origin, m_windowTransform );
        m_clipRgn.Set(HIShapeCreateWithRect(&r));
    }
}

    // resets the clipping to original extent
void wxMacCoreGraphicsContext::ResetClip()
{
    if ( m_cgContext )
    {
        // there is no way for clearing the clip, we can only revert to the stored
        // state, but then we have to make sure everything else is NOT restored
        CGAffineTransform transform = CGContextGetCTM( m_cgContext );
        CGContextRestoreGState( m_cgContext );
        CGContextSaveGState( m_cgContext );
        CGAffineTransform transformNew = CGContextGetCTM( m_cgContext );
        transformNew = CGAffineTransformInvert( transformNew ) ;
        CGContextConcatCTM( m_cgContext, transformNew);
        CGContextConcatCTM( m_cgContext, transform);
    }
    else
    {
        HIRect r = CGRectMake(0,0,0,0);
        m_clipRgn.Set(HIShapeCreateWithRect(&r));
    }
}

void wxMacCoreGraphicsContext::StrokePath( const wxGraphicsPath &path )
{
    if ( m_pen.IsNull() )
        return ;

    EnsureIsValid();

    bool offset = ShouldOffset();
    if ( offset )
        CGContextTranslateCTM( m_cgContext, 0.5, 0.5 );

    ((wxMacCoreGraphicsPenData*)m_pen.GetRefData())->Apply(this);
    CGContextAddPath( m_cgContext , (CGPathRef) path.GetNativePath() );
    CGContextStrokePath( m_cgContext );

    if ( offset )
        CGContextTranslateCTM( m_cgContext, -0.5, -0.5 );
}

void wxMacCoreGraphicsContext::DrawPath( const wxGraphicsPath &path , int fillStyle )
{
    if ( !m_brush.IsNull() && ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->IsShading() )
    {
        // when using shading, we cannot draw pen and brush at the same time
        // revert to the base implementation of first filling and then stroking
        wxGraphicsContext::DrawPath( path, fillStyle );
        return;
    }

    CGPathDrawingMode mode = kCGPathFill ;
    if ( m_brush.IsNull() )
    {
        if ( m_pen.IsNull() )
            return;
        else
            mode = kCGPathStroke;
    }
    else
    {
        if ( m_pen.IsNull() )
        {
            if ( fillStyle == wxODDEVEN_RULE )
                mode = kCGPathEOFill;
            else
                mode = kCGPathFill;
        }
        else
        {
            if ( fillStyle == wxODDEVEN_RULE )
                mode = kCGPathEOFillStroke;
            else
                mode = kCGPathFillStroke;
        }
    }

    EnsureIsValid();

    if ( !m_brush.IsNull() )
        ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->Apply(this);
    if ( !m_pen.IsNull() )
        ((wxMacCoreGraphicsPenData*)m_pen.GetRefData())->Apply(this);

    bool offset = ShouldOffset();

    if ( offset )
        CGContextTranslateCTM( m_cgContext, 0.5, 0.5 );

    CGContextAddPath( m_cgContext , (CGPathRef) path.GetNativePath() );
    CGContextDrawPath( m_cgContext , mode );

    if ( offset )
        CGContextTranslateCTM( m_cgContext, -0.5, -0.5 );
}

void wxMacCoreGraphicsContext::FillPath( const wxGraphicsPath &path , int fillStyle )
{
    if ( m_brush.IsNull() )
        return;

    EnsureIsValid();

    if ( ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->IsShading() )
    {
        CGContextSaveGState( m_cgContext );
        CGContextAddPath( m_cgContext , (CGPathRef) path.GetNativePath() );
        CGContextClip( m_cgContext );
        CGContextDrawShading( m_cgContext, ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->GetShading() );
        CGContextRestoreGState( m_cgContext);
    }
    else
    {
        ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->Apply(this);
        CGContextAddPath( m_cgContext , (CGPathRef) path.GetNativePath() );
        if ( fillStyle == wxODDEVEN_RULE )
            CGContextEOFillPath( m_cgContext );
        else
            CGContextFillPath( m_cgContext );
    }
}

void wxMacCoreGraphicsContext::SetNativeContext( CGContextRef cg )
{
    // we allow either setting or clearing but not replacing
    wxASSERT( m_cgContext == NULL || cg == NULL );

    if ( m_cgContext )
    {
        // TODO : when is this necessary - should we add a Flush() method ? CGContextSynchronize( m_cgContext );
        CGContextRestoreGState( m_cgContext );
        CGContextRestoreGState( m_cgContext );
        if ( m_releaseContext )
            QDEndCGContext( GetWindowPort( m_windowRef ) , &m_cgContext);
        else
            CGContextRelease(m_cgContext);
    }


    m_cgContext = cg;

    // FIXME: This check is needed because currently we need to use a DC/GraphicsContext
    // in order to get font properties, like wxFont::GetPixelSize, but since we don't have
    // a native window attached to use, I create a wxGraphicsContext with a NULL CGContextRef
    // for this one operation.

    // When wxFont::GetPixelSize on Mac no longer needs a graphics context, this check
    // can be removed.
    if (m_cgContext)
    {
        CGContextRetain(m_cgContext);
        CGContextSaveGState( m_cgContext );
        CGContextSaveGState( m_cgContext );
        m_releaseContext = false;
    }
}

void wxMacCoreGraphicsContext::Translate( wxDouble dx , wxDouble dy )
{
    if ( m_cgContext )
        CGContextTranslateCTM( m_cgContext, dx, dy );
    else
        m_windowTransform = CGAffineTransformTranslate(m_windowTransform,dx,dy);
}

void wxMacCoreGraphicsContext::Scale( wxDouble xScale , wxDouble yScale )
{
    if ( m_cgContext )
        CGContextScaleCTM( m_cgContext , xScale , yScale );
    else
        m_windowTransform = CGAffineTransformScale(m_windowTransform,xScale,yScale);
}

void wxMacCoreGraphicsContext::Rotate( wxDouble angle )
{
    if ( m_cgContext )
        CGContextRotateCTM( m_cgContext , angle );
    else
        m_windowTransform = CGAffineTransformRotate(m_windowTransform,angle);
}

void wxMacCoreGraphicsContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
{
    EnsureIsValid();

    CGImageRef image = (CGImageRef)( bmp.CGImageCreate() );
    HIRect r = CGRectMake( x , y , w , h );
    if ( bmp.GetDepth() == 1 )
    {
        // is is a mask, the '1' in the mask tell where to draw the current brush
        if (  !m_brush.IsNull() )
        {
            if ( ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->IsShading() )
            {
                // TODO clip to mask
            /*
                CGContextSaveGState( m_cgContext );
                CGContextAddPath( m_cgContext , (CGPathRef) path.GetNativePath() );
                CGContextClip( m_cgContext );
                CGContextDrawShading( m_cgContext, ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->GetShading() );
                CGContextRestoreGState( m_cgContext);
            */
            }
            else
            {
                ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->Apply(this);
                HIViewDrawCGImage( m_cgContext , &r , image );
            }
        }
    }
    else
    {
        HIViewDrawCGImage( m_cgContext , &r , image );
    }
    CGImageRelease( image );
}

void wxMacCoreGraphicsContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
{
    EnsureIsValid();

    CGRect r = CGRectMake( 00 , 00 , w , h );
    CGContextSaveGState( m_cgContext );
    CGContextTranslateCTM( m_cgContext, x , y + h );
    CGContextScaleCTM( m_cgContext, 1, -1 );
    PlotIconRefInContext( m_cgContext , &r , kAlignNone , kTransformNone ,
        NULL , kPlotIconRefNormalFlags , MAC_WXHICON( icon.GetHICON() ) );
    CGContextRestoreGState( m_cgContext );
}

void wxMacCoreGraphicsContext::PushState()
{
    EnsureIsValid();

    CGContextSaveGState( m_cgContext );
}