X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b8be0b4e05e283708b15fe04c9d534a1b649d1cb..282d1e47f99b81a2341cf6f377fab6a070efb446:/include/wx/dcbuffer.h?ds=sidebyside diff --git a/include/wx/dcbuffer.h b/include/wx/dcbuffer.h index 1f0c5a924f..1b5d728020 100644 --- a/include/wx/dcbuffer.h +++ b/include/wx/dcbuffer.h @@ -2,7 +2,7 @@ // Name: wx/dcbuffer.h // Purpose: wxBufferedDC class // Author: Ron Lee -// Modified by: +// Modified by: Vadim Zeitlin (refactored, added bg preservation) // Created: 16/03/02 // RCS-ID: $Id$ // Copyright: (c) Ron Lee @@ -12,92 +12,139 @@ #ifndef _WX_DCBUFFER_H_ #define _WX_DCBUFFER_H_ -#ifdef __GNUG__ -#pragma interface "dcbuffer.h" -#endif - #include "wx/dcmemory.h" +#include "wx/dcclient.h" -// ============================================================== -// Double buffering helper. -// -------------------------------------------------------------- +// ---------------------------------------------------------------------------- +// Double buffering helper. +// ---------------------------------------------------------------------------- -class WXDLLEXPORT wxBufferedDC : public wxMemoryDC +class 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 ) - {} - - // 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 ); + // Default ctor, must subsequently call Init for two stage construction. + wxBufferedDC() : m_dc( 0 ) + { + } + + // Construct a wxBufferedDC using a user supplied buffer. + wxBufferedDC(wxDC *dc, const wxBitmap &buffer) + : m_dc( dc ), + m_buffer( buffer ) + { + UseBuffer(); + } + + // 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) + : m_dc( dc ), + m_buffer( area.GetWidth(), area.GetHeight() ) + { + UseBuffer(); + } // 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(); + } + + // 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 &buffer) + { + wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap, + _T("wxBufferedDC already initialised") ); + m_dc = dc; + m_buffer = buffer; + UseBuffer(); + } + + void Init(wxDC *dc, const wxSize &area) + { + Init(dc, wxBitmap(area.GetWidth(), area.GetHeight())); + } + + // 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() + { + 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 = NULL; + } - ~wxBufferedDC(); +private: + // check that the bitmap is valid and use it + void UseBuffer() + { + wxASSERT_MSG( m_buffer.Ok(), _T("invalid bitmap in 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. + SelectObject(m_buffer); + } - void Init( wxDC *dc, const wxBitmap &bitmap ); - void Init( wxDC *dc, const wxSize &area ); + // the underlying DC to which we copy everything drawn on this one in + // UnMask() + // + // NB: Without the existence of a wxNullDC, this must be a pointer, else it + // could probably be a reference. + wxDC *m_dc; - // 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. + // the buffer (selected in this DC) + wxBitmap m_buffer; - void UnMask(); + 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 WXDLLEXPORT wxBufferedPaintDC : public wxBufferedDC +class wxBufferedPaintDC : public wxBufferedDC { -private: - - wxPaintDC m_paintdc; - public: - - wxBufferedPaintDC( wxWindow *window, const wxBitmap &buffer = wxNullBitmap ); + // If no bitmap is supplied by the user, a temporary one wil; be created. + wxBufferedPaintDC(wxWindow *window, const wxBitmap& buffer = wxNullBitmap) + : m_paintdc(window) + { + window->PrepareDC( m_paintdc ); + + if( buffer != wxNullBitmap ) + Init(&m_paintdc, buffer); + else + Init(&m_paintdc, window->GetClientSize()); + } // 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: + wxPaintDC m_paintdc; + + DECLARE_NO_COPY_CLASS(wxBufferedPaintDC) +}; #endif // _WX_DCBUFFER_H_ -// vi:sts=4:sw=4:et