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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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135
include/wx/dcbuffer.h
View File

@@ -2,7 +2,7 @@
// Name: wx/dcbuffer.h // Name: wx/dcbuffer.h
// Purpose: wxBufferedDC class // Purpose: wxBufferedDC class
// Author: Ron Lee <ron@debian.org> // Author: Ron Lee <ron@debian.org>
// Modified by: // Modified by: Vadim Zeitlin (refactored, added bg preservation)
// Created: 16/03/02 // Created: 16/03/02
// RCS-ID: $Id$ // RCS-ID: $Id$
// Copyright: (c) Ron Lee // Copyright: (c) Ron Lee
@@ -13,95 +13,136 @@
#define _WX_DCBUFFER_H_ #define _WX_DCBUFFER_H_
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma interface "dcbuffer.h" #pragma interface "dcbuffer.h"
#endif #endif
#include "wx/dcmemory.h" #include "wx/dcmemory.h"
#include "wx/dcclient.h" #include "wx/dcclient.h"
// flags for wxBufferedDC ctor/Init()
enum
{
// this is more efficient and hence default
wxBUFFER_DC_OVERWRITE_BG = 0,
// ============================================================== // 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. // Double buffering helper.
// -------------------------------------------------------------- // ----------------------------------------------------------------------------
class WXDLLIMPEXP_ADV wxBufferedDC : public wxMemoryDC 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: public:
// Default ctor, must subsequently call Init for two stage construction.
// Default ctor, must subsequently call Init for wxBufferedDC() : m_dc( 0 )
// two stage construction. {
}
wxBufferedDC()
: m_dc( 0 )
{}
// Construct a wxBufferedDC using a user supplied buffer. // Construct a wxBufferedDC using a user supplied buffer.
wxBufferedDC(wxDC *dc, const wxBitmap &buffer);
wxBufferedDC( wxDC *dc, const wxBitmap &buffer );
// Construct a wxBufferedDC with an internal buffer of 'area' // Construct a wxBufferedDC with an internal buffer of 'area'
// (where area is usually something like the size of the window // (where area is usually something like the size of the window
// being buffered) // being buffered)
wxBufferedDC(wxDC *dc, const wxSize &area, int flags = wxBUFFER_DC_DEFAULT);
wxBufferedDC( wxDC *dc, const wxSize &area );
// default copy ctor ok. // 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.
// These reimplement the actions of the ctors for void Init(wxDC *dc, const wxBitmap &bitmap);
// two stage creation, but are not used by the ctors void Init(wxDC *dc, const wxSize &area, int flags = wxBUFFER_DC_DEFAULT);
// 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.
// 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(); 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) DECLARE_NO_COPY_CLASS(wxBufferedDC)
}; };
// ============================================================== // ----------------------------------------------------------------------------
// Double buffered PaintDC. // Double buffered PaintDC.
// -------------------------------------------------------------- // ----------------------------------------------------------------------------
// Creates a double buffered wxPaintDC, optionally allowing the // Creates a double buffered wxPaintDC, optionally allowing the
// user to specify their own buffer to use. // user to specify their own buffer to use.
class WXDLLIMPEXP_ADV wxBufferedPaintDC : public wxBufferedDC class WXDLLIMPEXP_ADV wxBufferedPaintDC : public wxBufferedDC
{ {
private:
wxPaintDC m_paintdc;
public: 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. // 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) DECLARE_NO_COPY_CLASS(wxBufferedPaintDC)
}; };
#endif // _WX_DCBUFFER_H_ #endif // _WX_DCBUFFER_H_

79
src/generic/dcbuffer.cpp
View File

@@ -1,15 +1,14 @@
///////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////
// Name: dcbuffer.cpp // Name: generic/dcbuffer.cpp
// Purpose: wxBufferedDC class // Purpose: wxBufferedDC class
// Author: Ron Lee <ron@debian.org> // Author: Ron Lee <ron@debian.org>
// Modified by: // Modified by: Vadim Zeitlin (refactored, added bg preservation)
// Created: 16/03/02 // Created: 16/03/02
// RCS-ID: $Id$ // RCS-ID: $Id$
// Copyright: (c) Ron Lee // Copyright: (c) Ron Lee
// Licence: wxWindows licence // Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "dcbuffer.h" #pragma implementation "dcbuffer.h"
#endif #endif
@@ -21,36 +20,29 @@
#endif #endif
#ifndef WX_PRECOMP #ifndef WX_PRECOMP
#include "wx/window.h" #include "wx/window.h"
#endif #endif
#include "wx/dcbuffer.h" #include "wx/dcbuffer.h"
// ----------------------------------------------------------------------------
// ==============================================================
// Double buffering helper. // Double buffering helper.
// -------------------------------------------------------------- // ----------------------------------------------------------------------------
wxBufferedDC::wxBufferedDC( wxDC *dc, const wxBitmap &buffer ) wxBufferedDC::wxBufferedDC(wxDC *dc, const wxBitmap& buffer)
: m_dc( dc ) : m_dc( dc ),
, m_buffer( buffer ) m_buffer( buffer )
{ {
SelectObject( m_buffer ); UseBuffer();
} }
wxBufferedDC::wxBufferedDC( wxDC *dc, const wxSize &area ) wxBufferedDC::wxBufferedDC(wxDC *dc, const wxSize& area, int flags)
: m_dc( dc ) : m_dc( dc ),
, m_buffer( area.GetWidth(), area.GetHeight() ) m_buffer( area.GetWidth(), area.GetHeight() )
{ {
SelectObject( m_buffer ); UseBuffer();
}
wxBufferedDC::~wxBufferedDC() SaveBg(area, flags);
{
if( m_dc != 0 )
{
UnMask();
}
} }
void wxBufferedDC::Init( wxDC *dc, const wxBitmap &buffer ) void wxBufferedDC::Init( wxDC *dc, const wxBitmap &buffer )
@@ -60,50 +52,23 @@ void wxBufferedDC::Init( wxDC *dc, const wxBitmap &buffer )
m_dc = dc; m_dc = dc;
m_buffer = buffer; 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, Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()));
_T("wxBufferedDC already initialised") );
m_dc = dc; SaveBg(area, flags);
m_buffer = wxBitmap( area.GetWidth(), area.GetHeight() );
SelectObject( m_buffer );
} }
void wxBufferedDC::UnMask() 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->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