X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1cc8c8b74eef2b7f3b7fecee6f7933575808c56c..d11e8786ed13b72766eea18cb577cc00f9f08f41:/include/wx/dcbuffer.h?ds=sidebyside diff --git a/include/wx/dcbuffer.h b/include/wx/dcbuffer.h index 37988bef04..cac6228a8e 100644 --- a/include/wx/dcbuffer.h +++ b/include/wx/dcbuffer.h @@ -12,56 +12,79 @@ #ifndef _WX_DCBUFFER_H_ #define _WX_DCBUFFER_H_ -#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) - #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, - - // preserve the old background: more time consuming - wxBUFFER_DC_PRESERVE_BG = 1, - - - // flags used by default - wxBUFFER_DC_DEFAULT = wxBUFFER_DC_PRESERVE_BG -}; +#include "wx/window.h" // ---------------------------------------------------------------------------- // Double buffering helper. // ---------------------------------------------------------------------------- -class WXDLLIMPEXP_ADV wxBufferedDC : public wxMemoryDC +// Assumes the buffer bitmap covers the entire scrolled window, +// and prepares the window DC accordingly +#define wxBUFFER_VIRTUAL_AREA 0x01 + +// Assumes the buffer bitmap only covers the client area; +// does not prepare the window DC +#define wxBUFFER_CLIENT_AREA 0x02 + +class wxBufferedDC : public wxMemoryDC { public: // Default ctor, must subsequently call Init for two stage construction. - wxBufferedDC() : m_dc( 0 ) + wxBufferedDC() : m_dc( 0 ), m_style(0) { } // Construct a wxBufferedDC using a user supplied buffer. - wxBufferedDC(wxDC *dc, const wxBitmap &buffer); + wxBufferedDC(wxDC *dc, + const wxBitmap &buffer = wxNullBitmap, + int style = wxBUFFER_CLIENT_AREA) + : m_dc( dc ), + m_buffer( buffer ), + m_style(style) + { + 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, int flags = wxBUFFER_DC_DEFAULT); + wxBufferedDC(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA) + : m_dc( dc ), + m_buffer( area.GetWidth(), area.GetHeight() ), + m_style(style) + + { + UseBuffer(); + } // default copy ctor ok. // The usually desired action in the dtor is to blit the buffer. - virtual ~wxBufferedDC() { if ( m_dc ) UnMask(); } + 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 &bitmap); - void Init(wxDC *dc, const wxSize &area, int flags = wxBUFFER_DC_DEFAULT); + void Init(wxDC *dc, + const wxBitmap &buffer=wxNullBitmap, + int style = wxBUFFER_CLIENT_AREA) + { + wxASSERT_MSG( m_dc == 0 && m_buffer == wxNullBitmap, + _T("wxBufferedDC already initialised") ); + m_dc = dc; + m_buffer = buffer; + m_style = style; + UseBuffer(); + } + + void Init(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA) + { + Init(dc, wxBitmap(area.GetWidth(), area.GetHeight()), style); + } // Blits the buffer to the dc, and detaches the dc from the buffer (so it // can be effectively used once only). @@ -69,31 +92,52 @@ public: // 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() + { + wxASSERT_MSG( m_dc != 0, + _T("No underlying DC associated with wxBufferedDC (anymore)") ); + + wxCoord x=0, y=0; + + if (m_style & wxBUFFER_CLIENT_AREA) + GetDeviceOrigin(& x, & y); + + m_dc->Blit( 0, 0, + m_buffer.GetWidth(), m_buffer.GetHeight(), this, + -x, -y ); + m_dc = NULL; + } + + // Set and get the style + void SetStyle(int style) { m_style = style; } + int GetStyle() const { return m_style; } private: // check that the bitmap is valid and use it void UseBuffer() { - wxASSERT_MSG( m_buffer.Ok(), _T("invalid bitmap in wxBufferedDC") ); + if (!m_buffer.Ok()) + { + wxCoord w, h; + m_dc->GetSize(&w, &h); + m_buffer = wxBitmap(w, h); + } 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); - } - } + // 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; - // Without the existence of a wxNullDC, this must be - // a pointer, else it could probably be a reference. - wxDC *m_dc; + // the buffer (selected in this DC) + wxBitmap m_buffer; - wxBitmap m_buffer; + // the buffering style + int m_style; DECLARE_NO_COPY_CLASS(wxBufferedDC) }; @@ -105,22 +149,32 @@ private: // Creates a double buffered wxPaintDC, optionally allowing the // user to specify their own buffer to use. -class WXDLLIMPEXP_ADV wxBufferedPaintDC : public wxBufferedDC +class wxBufferedPaintDC : public wxBufferedDC { 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) + // If no bitmap is supplied by the user, a temporary one will be created. + wxBufferedPaintDC(wxWindow *window, const wxBitmap& buffer, int style = wxBUFFER_CLIENT_AREA) + : m_paintdc(window) { - Prepare(window); + // If we're buffering the virtual window, scale the paint DC as well + if (style & wxBUFFER_VIRTUAL_AREA) + window->PrepareDC( m_paintdc ); + + if( buffer != wxNullBitmap ) + Init(&m_paintdc, buffer, style); + else + Init(&m_paintdc, window->GetClientSize(), style); } - // the bitmap must be valid here - wxBufferedPaintDC(wxWindow *window, const wxBitmap& buffer) - : wxBufferedDC(&m_paintdc, buffer) + // If no bitmap is supplied by the user, a temporary one will be created. + wxBufferedPaintDC(wxWindow *window, int style = wxBUFFER_CLIENT_AREA) + : m_paintdc(window) { - Prepare(window); + // If we're using the virtual window, scale the paint DC as well + if (style & wxBUFFER_VIRTUAL_AREA) + window->PrepareDC( m_paintdc ); + + Init(&m_paintdc, window->GetClientSize(), style); } // default copy ctor ok. @@ -133,12 +187,6 @@ public: } private: - // prepare the underlying DC - void Prepare(wxWindow *window) - { - window->PrepareDC(m_paintdc); - } - wxPaintDC m_paintdc; DECLARE_NO_COPY_CLASS(wxBufferedPaintDC)