125817d0e3
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44736 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: src/common/dcbufcmn.cpp
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// Purpose: Buffered DC implementation
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// Author: Ron Lee, Jaakko Salli
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// Modified by:
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// Created: Sep-20-2006
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// RCS-ID: $Id$
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// Copyright: (c) wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#include "wx/dcbuffer.h"
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#ifndef WX_PRECOMP
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#include "wx/module.h"
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#endif
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// ============================================================================
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// implementation
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// ============================================================================
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// ----------------------------------------------------------------------------
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// wxSharedDCBufferManager: helper class maintaining backing store bitmap
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// ----------------------------------------------------------------------------
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class wxSharedDCBufferManager : public wxModule
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{
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public:
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wxSharedDCBufferManager() { }
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virtual bool OnInit() { return true; }
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virtual void OnExit() { wxDELETE(ms_buffer); }
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static wxBitmap* GetBuffer(int w, int h)
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{
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if ( ms_usingSharedBuffer )
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return new wxBitmap(w, h);
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if ( !ms_buffer ||
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w > ms_buffer->GetWidth() ||
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h > ms_buffer->GetHeight() )
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{
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delete ms_buffer;
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ms_buffer = new wxBitmap(w, h);
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}
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ms_usingSharedBuffer = true;
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return ms_buffer;
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}
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static void ReleaseBuffer(wxBitmap* buffer)
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{
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if ( buffer == ms_buffer )
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{
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wxASSERT_MSG( ms_usingSharedBuffer, wxT("shared buffer already released") );
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ms_usingSharedBuffer = false;
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}
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else
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{
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delete buffer;
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}
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}
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private:
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static wxBitmap *ms_buffer;
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static bool ms_usingSharedBuffer;
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DECLARE_DYNAMIC_CLASS(wxSharedDCBufferManager)
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};
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wxBitmap* wxSharedDCBufferManager::ms_buffer = NULL;
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bool wxSharedDCBufferManager::ms_usingSharedBuffer = false;
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IMPLEMENT_DYNAMIC_CLASS(wxSharedDCBufferManager, wxModule)
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// ============================================================================
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// wxBufferedDC
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// ============================================================================
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void wxBufferedDC::UseBuffer(wxCoord w, wxCoord h)
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{
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if ( !m_buffer || !m_buffer->IsOk() )
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{
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if ( w == -1 || h == -1 )
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m_dc->GetSize(&w, &h);
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m_buffer = wxSharedDCBufferManager::GetBuffer(w, h);
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m_style |= wxBUFFER_USES_SHARED_BUFFER;
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}
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SelectObject(*m_buffer);
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}
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void wxBufferedDC::UnMask()
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{
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wxCHECK_RET( m_dc, _T("no underlying wxDC?") );
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wxASSERT_MSG( m_buffer && m_buffer->IsOk(), _T("invalid backing store") );
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wxCoord x = 0,
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y = 0;
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if ( m_style & wxBUFFER_CLIENT_AREA )
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GetDeviceOrigin(&x, &y);
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m_dc->Blit(0, 0, m_buffer->GetWidth(), m_buffer->GetHeight(),
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this, -x, -y );
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m_dc = NULL;
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if ( m_style & wxBUFFER_USES_SHARED_BUFFER )
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wxSharedDCBufferManager::ReleaseBuffer(m_buffer);
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}
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