#pragma hdrstop
#endif
+#include "wx/dcbuffer.h"
+
#ifndef WX_PRECOMP
+ #include "wx/module.h"
#endif
-#include "wx/dcbuffer.h"
-
// ============================================================================
// implementation
// ============================================================================
+IMPLEMENT_DYNAMIC_CLASS(wxBufferedDC,wxMemoryDC)
+IMPLEMENT_ABSTRACT_CLASS(wxBufferedPaintDC,wxBufferedDC)
+
// ----------------------------------------------------------------------------
// wxSharedDCBufferManager: helper class maintaining backing store bitmap
// ----------------------------------------------------------------------------
-class wxSharedDCBufferManager
+class wxSharedDCBufferManager : public wxModule
{
public:
wxSharedDCBufferManager() { }
- ~wxSharedDCBufferManager() { }
- wxBitmap GetBuffer(int w, int h)
+ virtual bool OnInit() { return true; }
+ virtual void OnExit() { wxDELETE(ms_buffer); }
+
+ static wxBitmap* GetBuffer(int w, int h)
{
- if ( !m_buffer.IsOk() ||
- w > m_buffer.GetWidth() ||
- h > m_buffer.GetHeight() )
+ if ( ms_usingSharedBuffer )
+ return new wxBitmap(w, h);
+
+ if ( !ms_buffer ||
+ w > ms_buffer->GetWidth() ||
+ h > ms_buffer->GetHeight() )
{
- // Create slightly larger bitmap so we don't need to
- // be reallocating constantly when the user enlarges
- // the frame for the first time.
- m_buffer = wxBitmap(w, h);
+ delete ms_buffer;
+
+ // we must always return a valid bitmap but creating a bitmap of
+ // size 0 would fail, so create a 1*1 bitmap in this case
+ if ( !w )
+ w = 1;
+ if ( !h )
+ h = 1;
+
+ ms_buffer = new wxBitmap(w, h);
}
- return m_buffer;
+ ms_usingSharedBuffer = true;
+ return ms_buffer;
+ }
+
+ static void ReleaseBuffer(wxBitmap* buffer)
+ {
+ if ( buffer == ms_buffer )
+ {
+ wxASSERT_MSG( ms_usingSharedBuffer, wxT("shared buffer already released") );
+ ms_usingSharedBuffer = false;
+ }
+ else
+ {
+ delete buffer;
+ }
}
private:
- wxBitmap m_buffer;
+ static wxBitmap *ms_buffer;
+ static bool ms_usingSharedBuffer;
+
+ DECLARE_DYNAMIC_CLASS(wxSharedDCBufferManager)
};
-static wxSharedDCBufferManager gs_sharedDCBufferManager;
+wxBitmap* wxSharedDCBufferManager::ms_buffer = NULL;
+bool wxSharedDCBufferManager::ms_usingSharedBuffer = false;
+IMPLEMENT_DYNAMIC_CLASS(wxSharedDCBufferManager, wxModule)
// ============================================================================
// wxBufferedDC
void wxBufferedDC::UseBuffer(wxCoord w, wxCoord h)
{
- if ( !m_buffer.IsOk() )
+ if ( !m_buffer || !m_buffer->IsOk() )
{
if ( w == -1 || h == -1 )
m_dc->GetSize(&w, &h);
- m_buffer = gs_sharedDCBufferManager.GetBuffer(w, h);
+ m_buffer = wxSharedDCBufferManager::GetBuffer(w, h);
+ m_style |= wxBUFFER_USES_SHARED_BUFFER;
}
- SelectObject(m_buffer);
+ SelectObject(*m_buffer);
+
+ // now that the DC is valid we can inherit the attributes (fonts, colours,
+ // layout direction, ...) from the original DC
+ if ( m_dc && m_dc->IsOk() )
+ CopyAttributes(*m_dc);
}
+void wxBufferedDC::UnMask()
+{
+ wxCHECK_RET( m_dc, wxT("no underlying wxDC?") );
+ wxASSERT_MSG( m_buffer && m_buffer->IsOk(), wxT("invalid backing store") );
+
+ wxCoord x = 0,
+ y = 0;
+
+ // Ensure the scale matches the device
+ SetUserScale(1.0, 1.0);
+
+ if ( m_style & wxBUFFER_CLIENT_AREA )
+ GetDeviceOrigin(&x, &y);
+
+ // avoid blitting too much: if we were created for a bigger bitmap (and
+ // reused for a smaller one later) we should only blit the real bitmap area
+ // and not the full allocated back buffer
+ int widthDC,
+ heightDC;
+
+ m_dc->GetSize(&widthDC, &heightDC);
+
+ int widthBuf = m_buffer->GetWidth(),
+ heightBuf = m_buffer->GetHeight();
+
+ m_dc->Blit(0, 0,
+ wxMin(widthDC, widthBuf), wxMin(heightDC, heightBuf),
+ this,
+ -x, -y);
+ m_dc = NULL;
+
+ if ( m_style & wxBUFFER_USES_SHARED_BUFFER )
+ wxSharedDCBufferManager::ReleaseBuffer(m_buffer);
+}