added missing return on error

[wxWidgets.git] / src / mgl / region.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:      region.cpp
// Purpose:   Region handling for wxWindows/MGL
// Author:    Vaclav Slavik
// RCS-ID:    $Id$
// Copyright: (c) 2001 Vaclav Slavik
// Licence:   wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "region.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#include "wx/region.h"
#include "wx/gdicmn.h"
#include "wx/thread.h"

#include <mgraph.hpp>

#include "wx/listimpl.cpp"
WX_DEFINE_LIST(wxRegionRectList)

IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)

//-----------------------------------------------------------------------------
// wxRegionRefData implementation
//-----------------------------------------------------------------------------

class WXDLLEXPORT wxRegionRefData : public wxGDIRefData
{
public:
    wxRegionRefData()
    {
    }    

    wxRegionRefData(const wxRegionRefData& data)
    {
        m_region = data.m_region;
    }

    ~wxRegionRefData()
    {
    }

    MGLRegion m_region;
};

#define M_REGION       (((wxRegionRefData*)m_refData)->m_region)
#define M_REGION_OF(r) (((wxRegionRefData*)(r.m_refData))->m_region)

//-----------------------------------------------------------------------------
// wxRegion
//-----------------------------------------------------------------------------

/*
 * Create an empty region.
 */
wxRegion::wxRegion()
{
    m_refData = (wxRegionRefData *)NULL;
}

wxRegion::wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
{    
    m_refData = new wxRegionRefData;
    MGLRect rect(x, y, x + w, y + h);
    M_REGION = rect;
}

wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
{
    m_refData = new wxRegionRefData;
    MGLRect rect(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
    M_REGION = rect;
}

wxRegion::wxRegion(const wxRect& r)
{
    m_refData = new wxRegionRefData;
    MGLRect rect(r.GetLeft(), r.GetTop(), r.GetRight(), r.GetBottom());
    M_REGION = rect;
}

wxRegion::wxRegion(const MGLRegion& region)
{
    m_refData = new wxRegionRefData;
    M_REGION = region;
}

wxRegion::~wxRegion()
{
    // m_refData unrefed in ~wxObject
}

const MGLRegion& wxRegion::GetMGLRegion() const
{
    return M_REGION;
}

//-----------------------------------------------------------------------------
// Modify region
//-----------------------------------------------------------------------------

// Clear current region
void wxRegion::Clear()
{
    UnRef();
}


//-----------------------------------------------------------------------------
// Information on region
//-----------------------------------------------------------------------------

// Outer bounds of region
void wxRegion::GetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
{
    if (m_refData) 
    {
        rect_t rect;
        rect = M_REGION.getBounds();
        x = rect.left;
        y = rect.top;
        w = rect.right - rect.left;
        h = rect.bottom - rect.top;
    } 
    else 
    {
        x = y = w = h = 0;
    }
}

wxRect wxRegion::GetBox() const
{
    wxCoord x, y, w, h;
    GetBox(x, y, w, h);
    return wxRect(x, y, w, h);
}

// Is region empty?
bool wxRegion::Empty() const
{
    if (!m_refData) return TRUE;
    return M_REGION.isEmpty();
}

//-----------------------------------------------------------------------------
// Modifications
//-----------------------------------------------------------------------------

// Union rectangle or region with this.
bool wxRegion::Union(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
{
    Unshare();
    M_REGION += MGLRect(x, y, x + width, y + height);
    return TRUE;
}

bool wxRegion::Union(const wxRegion& region)
{
    Unshare();
    M_REGION += M_REGION_OF(region);
    return TRUE;
}

// Intersect rectangle or region with this.
bool wxRegion::Intersect(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
{
    Unshare();
    M_REGION &= MGLRect(x, y, x + width, y + height);
    return TRUE;
}

bool wxRegion::Intersect(const wxRegion& region)
{
    Unshare();
    M_REGION &= M_REGION_OF(region);
    return TRUE;
}

// Subtract rectangle or region from this:
// Combines the parts of 'this' that are not part of the second region.
bool wxRegion::Subtract(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
{
    Unshare();
    M_REGION -= MGLRect(x, y, x + width, y + height);
    return TRUE;
}

bool wxRegion::Subtract(const wxRegion& region)
{
    Unshare();
    M_REGION -= M_REGION_OF(region);
    return TRUE;
}

// XOR: the union of two combined regions except for any overlapping areas.
bool wxRegion::Xor(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
{
    Unshare();
    MGLRect rect(x, y, x + width, y + height);
    MGLRegion rg1 = M_REGION + rect,
              rg2 = M_REGION & rect;
    M_REGION = rg1 - rg2;
    return TRUE;    
}

bool wxRegion::Xor(const wxRegion& region)
{
    Unshare();
    MGLRegion rg1 = M_REGION + M_REGION_OF(region),
              rg2 = M_REGION & M_REGION_OF(region);
    M_REGION = rg1 - rg2;
    return TRUE;
}


//-----------------------------------------------------------------------------
// Tests
//-----------------------------------------------------------------------------

// Does the region contain the point (x,y)?
wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y) const
{
    if (!m_refData)
        return wxOutRegion;

    if (M_REGION.includes((int)x, (int)y))
        return wxInRegion;
    else
        return wxOutRegion;
}

// Does the region contain the point pt?
wxRegionContain wxRegion::Contains(const wxPoint& pt) const
{
    return Contains(pt.x, pt.y);
}

// Does the region contain the rectangle (x, y, w, h)?
wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y, wxCoord w, wxCoord h) const
{
    if (!m_refData)
        return wxOutRegion;

    MGLRect rect(x, y, x + w, y + h);
    MGLRegion rg;
    
    // 1) is the rectangle entirely covered by the region?
    rg = MGLRegion(rect) - M_REGION;
    if (rg.isEmpty()) return wxInRegion;
    
    // 2) is the rectangle completely outside the region?
    rg = M_REGION & rect; // intersection
    if (rg.isEmpty()) return wxOutRegion;

    // 3) neither case happened => it is partially covered:
    return wxPartRegion;
}

// Does the region contain the rectangle rect
wxRegionContain wxRegion::Contains(const wxRect& rect) const
{
    return Contains(rect.x, rect.y, rect.width, rect.height);
}



void wxRegion::Unshare()
{
    if (!m_refData)
    {
        m_refData = new wxRegionRefData();
    }
    else
    {
        wxRegionRefData* ref = new wxRegionRefData(*(wxRegionRefData*)m_refData);
        UnRef();
        m_refData = ref;
    }
}





///////////////////////////////////////////////////////////////////////////////
//                               wxRegionIterator                                 //
///////////////////////////////////////////////////////////////////////////////

/*
 * Initialize empty iterator
 */
wxRegionIterator::wxRegionIterator() : m_currentNode(NULL)
{
    m_rects.DeleteContents(TRUE);
}

wxRegionIterator::~wxRegionIterator()
{
}

/*
 * Initialize iterator for region
 */
wxRegionIterator::wxRegionIterator(const wxRegion& region)
{
    m_rects.DeleteContents(TRUE);
    Reset(region);
}

/*
 * Reset iterator for a new /e region.
 */
 

static wxRegionRectList *gs_rectList;

static void wxMGL_region_callback(const rect_t *r)
{
    gs_rectList->Append(new wxRect(r->left, r->top, 
                                   r->right - r->left, r->bottom - r->top));
}
 
void wxRegionIterator::Reset(const wxRegion& region)
{
    m_currentNode = NULL;
    m_rects.Clear();

    if (!region.Empty())
    {
        wxMutexGuiEnter();
        gs_rectList = &m_rects;
        M_REGION_OF(region).traverse(wxMGL_region_callback);
        wxMutexGuiLeave();
        m_currentNode = m_rects.GetFirst();
    }
}

/*
 * Increment iterator. The rectangle returned is the one after the
 * incrementation.
 */
void wxRegionIterator::operator ++ ()
{
    if (m_currentNode)
        m_currentNode = m_currentNode->GetNext();
}

/*
 * Increment iterator. The rectangle returned is the one before the
 * incrementation.
 */
void wxRegionIterator::operator ++ (int)
{
    if (m_currentNode)
        m_currentNode = m_currentNode->GetNext();
}

wxCoord wxRegionIterator::GetX() const
{
    if (m_currentNode)
        return m_currentNode->GetData()->x;
    else
        return 0;
}

wxCoord wxRegionIterator::GetY() const
{
    if (m_currentNode)
        return m_currentNode->GetData()->y;
    else
        return 0;
}

wxCoord wxRegionIterator::GetW() const
{
    if (m_currentNode)
        return m_currentNode->GetData()->width;
    else
        return 0;
}

wxCoord wxRegionIterator::GetH() const
{
    if (m_currentNode)
        return m_currentNode->GetData()->height;
    else
        return 0;
}