reduce black background flicker a bit - there is still some left sometimes initially...

[wxWidgets.git] / src / gtk1 / region.cpp

diff --git a/src/gtk1/region.cpp b/src/gtk1/region.cpp
index e14e12d10f371cba3b2de4361e16079c389c89c4..5807eabbeec9a3062d06f9e800c7521540f16c52 100644 (file)
--- a/src/gtk1/region.cpp
+++ b/src/gtk1/region.cpp
@@ -12,7 +12,7 @@
 // declarations
 // ============================================================================
 
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
     #pragma implementation "region.h"
 #endif
 
@@ -20,12 +20,33 @@
 // headers
 // ----------------------------------------------------------------------------
 
-#include "wx/log.h"
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
 
 #include "wx/region.h"
-
+#include "wx/log.h"
 #include "wx/gtk/private.h"
 
+#ifndef __WXGTK20__
+
+// ----------------------------------------------------------------------------
+// wxGdkRegion: creates a new region in ctor and destroys in dtor
+// ----------------------------------------------------------------------------
+
+class wxGdkRegion
+{
+public:
+    wxGdkRegion() { m_region = gdk_region_new(); }
+    ~wxGdkRegion() { gdk_region_destroy(m_region); }
+
+    operator GdkRegion *() const { return m_region; }
+
+private:
+    GdkRegion *m_region;
+};
+
+#endif // __WXGTK20__
+
 // ----------------------------------------------------------------------------
 // wxRegionRefData: private class containing the information about the region
 // ----------------------------------------------------------------------------
@@ -37,20 +58,17 @@ public:
     {
         m_region = NULL;
     }
-    
+
     wxRegionRefData(const wxRegionRefData& refData)
         : wxObjectRefData()
     {
 #ifdef __WXGTK20__
         m_region = gdk_region_copy(refData.m_region);
 #else
-        m_region = gdk_region_new();
-        GdkRegion *regCopy = gdk_regions_union(m_region, refData.m_region);
-        gdk_region_destroy(m_region);
-        m_region = regCopy;
+        m_region = gdk_regions_union(wxGdkRegion(), refData.m_region);
 #endif
     }
-    
+
     ~wxRegionRefData()
     {
         if (m_region)
@@ -83,22 +101,24 @@ void wxRegion::InitRect(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
     rect.y = y;
     rect.width = w;
     rect.height = h;
-    
+
     m_refData = new wxRegionRefData();
-    
+
 #ifdef __WXGTK20__
     M_REGIONDATA->m_region = gdk_region_rectangle( &rect );
 #else
-    GdkRegion *reg = gdk_region_new();
-    M_REGIONDATA->m_region = gdk_region_union_with_rect( reg, &rect );
-    gdk_region_destroy( reg );
+    M_REGIONDATA->m_region = gdk_region_union_with_rect( wxGdkRegion(), &rect );
 #endif
 }
 
 wxRegion::wxRegion( GdkRegion *region )
 {
     m_refData = new wxRegionRefData();
+#ifdef __WXGTK20__
     M_REGIONDATA->m_region = gdk_region_copy( region );
+#else
+    M_REGIONDATA->m_region = gdk_regions_union(wxGdkRegion(), region);
+#endif
 }
 
 wxRegion::wxRegion( size_t n, const wxPoint *points, int fillStyle )
@@ -149,7 +169,7 @@ bool wxRegion::operator==( const wxRegion& region )
     if (m_refData == region.m_refData) return TRUE;
 
     if (!m_refData || !region.m_refData) return FALSE;
-    
+
     // compare the regions themselves, not the pointers to ref data!
     return gdk_region_equal(M_REGIONDATA->m_region,
                             M_REGIONDATA_OF(region)->m_region);
@@ -166,27 +186,26 @@ void wxRegion::Clear()
 
 bool wxRegion::Union( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 {
-    GdkRectangle rect;
-    rect.x = x;
-    rect.y = y;
-    rect.width = width;
-    rect.height = height;
-    
-    if (!m_refData)
+    // workaround for a strange GTK/X11 bug: taking union with an empty
+    // rectangle results in an empty region which is definitely not what we
+    // want
+    if ( !width || !height )
+        return TRUE;
+
+    if ( !m_refData )
     {
-        m_refData = new wxRegionRefData();
-#ifdef __WXGTK20__
-        M_REGIONDATA->m_region = gdk_region_rectangle( &rect );
-#else
-        GdkRegion *reg = gdk_region_new();
-        M_REGIONDATA->m_region = gdk_region_union_with_rect( reg, &rect );
-        gdk_region_destroy( reg );
-#endif
+        InitRect(x, y, width, height);
     }
     else
     {
         AllocExclusive();
 
+        GdkRectangle rect;
+        rect.x = x;
+        rect.y = y;
+        rect.width = width;
+        rect.height = height;
+
 #ifdef __WXGTK20__
         gdk_region_union_with_rect( M_REGIONDATA->m_region, &rect );
 #else
@@ -240,7 +259,7 @@ bool wxRegion::Intersect( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 bool wxRegion::Intersect( const wxRect& rect )
 {
     wxRegion reg( rect );
-    
+
     return Intersect( reg );
 }
 
@@ -251,17 +270,12 @@ bool wxRegion::Intersect( const wxRegion& region )
 
     if (!m_refData)
     {
-        m_refData = new wxRegionRefData();
-        M_REGIONDATA->m_region = gdk_region_new();
-        
-        // leave here 
-        return TRUE;
-    }
-    else
-    {
-        AllocExclusive();
+        // intersecting with invalid region doesn't make sense
+        return FALSE;
     }
 
+    AllocExclusive();
+
 #ifdef __WXGTK20__
     gdk_region_intersect( M_REGIONDATA->m_region, region.GetRegion() );
 #else
@@ -292,14 +306,12 @@ bool wxRegion::Subtract( const wxRegion& region )
 
     if (!m_refData)
     {
-        m_refData = new wxRegionRefData();
-        M_REGIONDATA->m_region = gdk_region_new();
-    }
-    else
-    {
-        AllocExclusive();
+        // subtracting from an invalid region doesn't make sense
+        return FALSE;
     }
 
+    AllocExclusive();
+
 #ifdef __WXGTK20__
     gdk_region_subtract( M_REGIONDATA->m_region, region.GetRegion() );
 #else
@@ -330,14 +342,11 @@ bool wxRegion::Xor( const wxRegion& region )
 
     if (!m_refData)
     {
-        m_refData = new wxRegionRefData();
-        M_REGIONDATA->m_region = gdk_region_new();
-    }
-    else
-    {
-        AllocExclusive();
+        return FALSE;
     }
 
+    AllocExclusive();
+
 #ifdef __WXGTK20__
     gdk_region_xor( M_REGIONDATA->m_region, region.GetRegion() );
 #else
@@ -349,6 +358,18 @@ bool wxRegion::Xor( const wxRegion& region )
     return TRUE;
 }
 
+bool wxRegion::Offset( wxCoord x, wxCoord y )
+{
+    if (!m_refData)
+        return FALSE;
+
+    AllocExclusive();
+
+    gdk_region_offset( M_REGIONDATA->m_region, x, y );
+
+    return TRUE;
+}
+
 // ----------------------------------------------------------------------------
 // wxRegion tests
 // ----------------------------------------------------------------------------
@@ -380,18 +401,6 @@ wxRect wxRegion::GetBox() const
     return wxRect( x, y, w, h );
 }
 
-bool wxRegion::Offset( wxCoord x, wxCoord y )
-{
-    if (!m_refData)
-        return FALSE;
-
-    AllocExclusive();
-
-    gdk_region_offset( M_REGIONDATA->m_region, x, y );
-
-    return TRUE;
-}
-
 bool wxRegion::Empty() const
 {
     if (!m_refData)
@@ -472,7 +481,7 @@ struct _XRegion {
     _XBox *rects, extents;
 };
 
-#endif
+#endif // GTK+ 1.x
 
 class wxRIRefData: public wxObjectRefData
 {
@@ -498,16 +507,16 @@ void wxRIRefData::CreateRects( const wxRegion& region )
     delete [] m_rects;
 
     Init();
-    
+
     GdkRegion *gdkregion = region.GetRegion();
     if (!gdkregion)
         return;
-    
+
 #ifdef __WXGTK20__
     GdkRectangle *gdkrects = NULL;
     gint numRects = 0;
     gdk_region_get_rectangles( gdkregion, &gdkrects, &numRects );
-    
+
     m_numRects = numRects;
     if (numRects)
     {
@@ -569,42 +578,48 @@ bool wxRegionIterator::HaveRects() const
     return m_current < ((wxRIRefData*)m_refData)->m_numRects;
 }
 
-wxRegionIterator::operator bool () const
+wxRegionIterator& wxRegionIterator::operator ++ ()
 {
-    return HaveRects();
-}
+    if (HaveRects())
+        ++m_current;
 
-void wxRegionIterator::operator ++ ()
-{
-    if (HaveRects()) ++m_current;
+    return *this;
 }
 
-void wxRegionIterator::operator ++ (int)
+wxRegionIterator wxRegionIterator::operator ++ (int)
 {
-    if (HaveRects()) ++m_current;
+    wxRegionIterator tmp = *this;
+    if (HaveRects())
+        ++m_current;
+
+    return tmp;
 }
 
 wxCoord wxRegionIterator::GetX() const
 {
-    if( !HaveRects() ) return 0;
+    wxCHECK_MSG( HaveRects(), 0, _T("invalid wxRegionIterator") );
+
     return ((wxRIRefData*)m_refData)->m_rects[m_current].x;
 }
 
 wxCoord wxRegionIterator::GetY() const
 {
-    if( !HaveRects() ) return 0;
+    wxCHECK_MSG( HaveRects(), 0, _T("invalid wxRegionIterator") );
+
     return ((wxRIRefData*)m_refData)->m_rects[m_current].y;
 }
 
 wxCoord wxRegionIterator::GetW() const
 {
-    if( !HaveRects() ) return -1;
+    wxCHECK_MSG( HaveRects(), 0, _T("invalid wxRegionIterator") );
+
     return ((wxRIRefData*)m_refData)->m_rects[m_current].width;
 }
 
 wxCoord wxRegionIterator::GetH() const
 {
-    if( !HaveRects() ) return -1;
+    wxCHECK_MSG( HaveRects(), 0, _T("invalid wxRegionIterator") );
+
     return ((wxRIRefData*)m_refData)->m_rects[m_current].height;
 }