make it explicitly clear that the len parameter of SetData() is in bytes

[wxWidgets.git] / src / osx / core / dcmemory.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/osx/core/dcmemory.cpp
// Purpose:     wxMemoryDC class
// Author:      Stefan Csomor
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#include "wx/wxprec.h"

#include "wx/dcmemory.h"
#include "wx/graphics.h"
#include "wx/osx/dcmemory.h"

#include "wx/osx/private.h"

//-----------------------------------------------------------------------------
// wxMemoryDCImpl
//-----------------------------------------------------------------------------

IMPLEMENT_ABSTRACT_CLASS(wxMemoryDCImpl,wxPaintDCImpl)


wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner )
  : wxPaintDCImpl( owner )
{
    Init();
}

wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxBitmap& bitmap )
  : wxPaintDCImpl( owner )
{
    Init();
    DoSelect(bitmap);
}

wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxDC * WXUNUSED(dc) )
  : wxPaintDCImpl( owner )
{
    Init();
}

void wxMemoryDCImpl::Init()
{
    m_ok = true;
    SetBackground(*wxWHITE_BRUSH);
    SetBrush(*wxWHITE_BRUSH);
    SetPen(*wxBLACK_PEN);
    SetFont(*wxNORMAL_FONT);
    m_ok = false;
}

wxMemoryDCImpl::~wxMemoryDCImpl()
{
    if ( m_selected.Ok() )
    {
        m_selected.EndRawAccess() ;
        delete m_graphicContext ;
        m_graphicContext = NULL ;
    }
}

void wxMemoryDCImpl::DoSelect( const wxBitmap& bitmap )
{
    if ( m_selected.Ok() )
    {
        m_selected.EndRawAccess() ;
        delete m_graphicContext ;
        m_graphicContext = NULL ;
    }

    m_selected = bitmap;
    if (m_selected.Ok())
    {
        if ( m_selected.GetDepth() != 1 )
            m_selected.UseAlpha() ;
        m_selected.BeginRawAccess() ;
		m_width = bitmap.GetWidth();
		m_height = bitmap.GetHeight();
        CGColorSpaceRef genericColorSpace  = wxMacGetGenericRGBColorSpace();
        CGContextRef bmCtx = (CGContextRef) m_selected.GetHBITMAP();

        if ( bmCtx )
        {
            CGContextSetFillColorSpace( bmCtx, genericColorSpace );
            CGContextSetStrokeColorSpace( bmCtx, genericColorSpace );
			SetGraphicsContext( wxGraphicsContext::CreateFromNative( bmCtx ) );
        }
        m_ok = (m_graphicContext != NULL) ;
    }
    else
    {
        m_ok = false;
    }
}

void wxMemoryDCImpl::DoGetSize( int *width, int *height ) const
{
    if (m_selected.Ok())
    {
        if (width)
            (*width) = m_selected.GetWidth();
        if (height)
            (*height) = m_selected.GetHeight();
    }
    else
    {
        if (width)
            (*width) = 0;
        if (height)
            (*height) = 0;
    }
}