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made it possible to preserve background when using wxBufferedDC (replaces patch 876263); some refactoring

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@25567 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2004-02-07 16:16:36 +00:00
parent de2ce07c7a
commit 1cc8c8b74e
2 changed files with 118 additions and 112 deletions
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149
include/wx/dcbuffer.h
View File

@@ -2,7 +2,7 @@
// Name: wx/dcbuffer.h
// Purpose: wxBufferedDC class
// Author: Ron Lee <ron@debian.org>
// Modified by:
// Modified by: Vadim Zeitlin (refactored, added bg preservation)
// Created: 16/03/02
// RCS-ID: $Id$
// Copyright: (c) Ron Lee
@@ -13,95 +13,136 @@
#define _WX_DCBUFFER_H_
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma interface "dcbuffer.h"
#pragma interface "dcbuffer.h"
#endif
#include "wx/dcmemory.h"
#include "wx/dcclient.h"
// flags for wxBufferedDC ctor/Init()
enum
{
// this is more efficient and hence default
wxBUFFER_DC_OVERWRITE_BG = 0,
// ==============================================================
// Double buffering helper.
// --------------------------------------------------------------
// preserve the old background: more time consuming
wxBUFFER_DC_PRESERVE_BG = 1,
// flags used by default
wxBUFFER_DC_DEFAULT = wxBUFFER_DC_PRESERVE_BG
};
// ----------------------------------------------------------------------------
// Double buffering helper.
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_ADV wxBufferedDC : public wxMemoryDC
{
private:
// Without the existence of a wxNullDC, this must be
// a pointer, else it could probably be a reference.
wxDC *m_dc;
wxBitmap m_buffer;
public:
// Default ctor, must subsequently call Init for two stage construction.
wxBufferedDC() : m_dc( 0 )
{
}
// Default ctor, must subsequently call Init for
// two stage construction.
// Construct a wxBufferedDC using a user supplied buffer.
wxBufferedDC(wxDC *dc, const wxBitmap &buffer);
wxBufferedDC()
: m_dc( 0 )
{}
// Construct a wxBufferedDC using a user supplied buffer.
wxBufferedDC( wxDC *dc, const wxBitmap &buffer );
// Construct a wxBufferedDC with an internal buffer of 'area'
// (where area is usually something like the size of the window
// being buffered)
wxBufferedDC( wxDC *dc, const wxSize &area );
// Construct a wxBufferedDC with an internal buffer of 'area'
// (where area is usually something like the size of the window
// being buffered)
wxBufferedDC(wxDC *dc, const wxSize &area, int flags = wxBUFFER_DC_DEFAULT);
// default copy ctor ok.
// The usually desired action in the dtor is to blit the buffer.
// The usually desired action in the dtor is to blit the buffer.
virtual ~wxBufferedDC() { if ( m_dc ) UnMask(); }
~wxBufferedDC();
// These reimplement the actions of the ctors for
// two stage creation, but are not used by the ctors
// themselves to save a few cpu cycles.
void Init( wxDC *dc, const wxBitmap &bitmap );
void Init( wxDC *dc, const wxSize &area );
// Blits the buffer to the dc, and detaches the dc from
// the buffer. Usually called in the dtor or by the dtor
// of derived classes if the BufferedDC must blit before
// the derived class (which may own the dc it's blitting
// to) is destroyed.
// These reimplement the actions of the ctors for two stage creation, but
// are not used by the ctors themselves to save a few cpu cycles.
void Init(wxDC *dc, const wxBitmap &bitmap);
void Init(wxDC *dc, const wxSize &area, int flags = wxBUFFER_DC_DEFAULT);
// Blits the buffer to the dc, and detaches the dc from the buffer (so it
// can be effectively used once only).
//
// Usually called in the dtor or by the dtor of derived classes if the
// BufferedDC must blit before the derived class (which may own the dc it's
// blitting to) is destroyed.
void UnMask();
private:
// check that the bitmap is valid and use it
void UseBuffer()
{
wxASSERT_MSG( m_buffer.Ok(), _T("invalid bitmap in wxBufferedDC") );
SelectObject(m_buffer);
}
// preserve the background if necessary
void SaveBg(const wxSize& area, int flags)
{
if ( flags & wxBUFFER_DC_PRESERVE_BG )
{
Blit(0, 0, area.GetWidth(), area.GetHeight(), m_dc, 0, 0);
}
}
// Without the existence of a wxNullDC, this must be
// a pointer, else it could probably be a reference.
wxDC *m_dc;
wxBitmap m_buffer;
DECLARE_NO_COPY_CLASS(wxBufferedDC)
};
// ==============================================================
// Double buffered PaintDC.
// --------------------------------------------------------------
// ----------------------------------------------------------------------------
// Double buffered PaintDC.
// ----------------------------------------------------------------------------
// Creates a double buffered wxPaintDC, optionally allowing the
// user to specify their own buffer to use.
class WXDLLIMPEXP_ADV wxBufferedPaintDC : public wxBufferedDC
{
private:
wxPaintDC m_paintdc;
public:
// this ctor creates a bitmap of the size of the window for buffering
wxBufferedPaintDC(wxWindow *window, int flags = wxBUFFER_DC_DEFAULT)
: wxBufferedDC(&m_paintdc, window->GetClientSize(), flags),
m_paintdc(window)
{
Prepare(window);
}
wxBufferedPaintDC( wxWindow *window, const wxBitmap &buffer = wxNullBitmap );
// the bitmap must be valid here
wxBufferedPaintDC(wxWindow *window, const wxBitmap& buffer)
: wxBufferedDC(&m_paintdc, buffer)
{
Prepare(window);
}
// default copy ctor ok.
~wxBufferedPaintDC();
virtual ~wxBufferedPaintDC()
{
// We must UnMask here, else by the time the base class
// does it, the PaintDC will have already been destroyed.
UnMask();
}
private:
// prepare the underlying DC
void Prepare(wxWindow *window)
{
window->PrepareDC(m_paintdc);
}
wxPaintDC m_paintdc;
DECLARE_NO_COPY_CLASS(wxBufferedPaintDC)
};
#endif // _WX_DCBUFFER_H_

81
src/generic/dcbuffer.cpp
View File

@@ -1,15 +1,14 @@
/////////////////////////////////////////////////////////////////////////////
// Name: dcbuffer.cpp
// Name: generic/dcbuffer.cpp
// Purpose: wxBufferedDC class
// Author: Ron Lee <ron@debian.org>
// Modified by:
// Modified by: Vadim Zeitlin (refactored, added bg preservation)
// Created: 16/03/02
// RCS-ID: $Id$
// Copyright: (c) Ron Lee
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "dcbuffer.h"
#endif
@@ -21,36 +20,29 @@
#endif
#ifndef WX_PRECOMP
#include "wx/window.h"
#include "wx/window.h"
#endif
#include "wx/dcbuffer.h"
// ----------------------------------------------------------------------------
// Double buffering helper.
// ----------------------------------------------------------------------------
// ==============================================================
// Double buffering helper.
// --------------------------------------------------------------
wxBufferedDC::wxBufferedDC( wxDC *dc, const wxBitmap &buffer )
: m_dc( dc )
, m_buffer( buffer )
wxBufferedDC::wxBufferedDC(wxDC *dc, const wxBitmap& buffer)
: m_dc( dc ),
m_buffer( buffer )
{
SelectObject( m_buffer );
UseBuffer();
}
wxBufferedDC::wxBufferedDC( wxDC *dc, const wxSize &area )
: m_dc( dc )
, m_buffer( area.GetWidth(), area.GetHeight() )
wxBufferedDC::wxBufferedDC(wxDC *dc, const wxSize& area, int flags)
: m_dc( dc ),
m_buffer( area.GetWidth(), area.GetHeight() )
{
SelectObject( m_buffer );
}
UseBuffer();
wxBufferedDC::~wxBufferedDC()
{
if( m_dc != 0 )
{
UnMask();
}
SaveBg(area, flags);
}
void wxBufferedDC::Init( wxDC *dc, const wxBitmap &buffer )
@@ -60,50 +52,23 @@ void wxBufferedDC::Init( wxDC *dc, const wxBitmap &buffer )
m_dc = dc;
m_buffer = buffer;
SelectObject( m_buffer );
UseBuffer();
}
void wxBufferedDC::Init( wxDC *dc, const wxSize &area )
void wxBufferedDC::Init(wxDC *dc, const wxSize& area, int flags)
{
wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap,
_T("wxBufferedDC already initialised") );
Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()));
m_dc = dc;
m_buffer = wxBitmap( area.GetWidth(), area.GetHeight() );
SelectObject( m_buffer );
SaveBg(area, flags);
}
void wxBufferedDC::UnMask()
{
wxASSERT_MSG( m_dc != 0, _T("No low level DC associated with buffer (anymore)") );
wxASSERT_MSG( m_dc != 0,
_T("No underlying DC associated with wxBufferedDC (anymore)") );
m_dc->Blit( 0, 0, m_buffer.GetWidth(), m_buffer.GetHeight(), this, 0, 0 );
m_dc = 0;
m_dc = NULL;
}
// ==============================================================
// Double buffered PaintDC.
// --------------------------------------------------------------
wxBufferedPaintDC::wxBufferedPaintDC( wxWindow *window, const wxBitmap &buffer )
: m_paintdc( window )
{
window->PrepareDC( m_paintdc );
if( buffer != wxNullBitmap )
Init( &m_paintdc, buffer );
else
Init( &m_paintdc, window->GetClientSize() );
}
wxBufferedPaintDC::~wxBufferedPaintDC()
{
// We must UnMask here, else by the time the base class
// does it, the PaintDC will have already been destroyed.
UnMask();
}
// vi:sts=4:sw=4:et