X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b8be0b4e05e283708b15fe04c9d534a1b649d1cb..7344108e8a129a3f9b4df5ab0f98a1713db03b89:/include/wx/dcbuffer.h?ds=sidebyside diff --git a/include/wx/dcbuffer.h b/include/wx/dcbuffer.h index 1f0c5a924f..40cb8179cd 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 +12,238 @@ #ifndef _WX_DCBUFFER_H_ #define _WX_DCBUFFER_H_ -#ifdef __GNUG__ -#pragma interface "dcbuffer.h" -#endif - #include "wx/dcmemory.h" +#include "wx/dcclient.h" +#include "wx/window.h" + +// Split platforms into two groups - those which have well-working +// double-buffering by default, and those which do not. +#if defined(__WXMAC__) || defined(__WXGTK20__) || defined(__WXDFB__) + #define wxALWAYS_NATIVE_DOUBLE_BUFFER 1 +#else + #define wxALWAYS_NATIVE_DOUBLE_BUFFER 0 +#endif -// ============================================================== -// Double buffering helper. -// -------------------------------------------------------------- +// ---------------------------------------------------------------------------- +// Double buffering helper. +// ---------------------------------------------------------------------------- -class WXDLLEXPORT wxBufferedDC : public wxMemoryDC -{ -private: +// Assumes the buffer bitmap covers the entire scrolled window, +// and prepares the window DC accordingly +#define wxBUFFER_VIRTUAL_AREA 0x01 - // Without the existence of a wxNullDC, this must be - // a pointer, else it could probably be a reference. +// Assumes the buffer bitmap only covers the client area; +// does not prepare the window DC +#define wxBUFFER_CLIENT_AREA 0x02 - wxDC *m_dc; - wxBitmap m_buffer; +// Set when not using specific buffer bitmap. Note that this +// is private style and not returned by GetStyle. +#define wxBUFFER_USES_SHARED_BUFFER 0x04 +class WXDLLIMPEXP_CORE wxBufferedDC : public wxMemoryDC +{ public: - - // Default ctor, must subsequently call Init for - // two stage construction. - + // 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(NULL), + m_buffer(NULL), + m_style(0) + { + } + + // Construct a wxBufferedDC using a user supplied buffer. + wxBufferedDC(wxDC *dc, + wxBitmap& buffer = wxNullBitmap, + int style = wxBUFFER_CLIENT_AREA) + : m_dc(NULL), m_buffer(NULL) + { + Init(dc, buffer, style); + } + + // 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 style = wxBUFFER_CLIENT_AREA) + : m_dc(NULL), m_buffer(NULL) + { + Init(dc, area, style); + } + + // 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 + void Init(wxDC *dc, + wxBitmap& buffer = wxNullBitmap, + int style = wxBUFFER_CLIENT_AREA) + { + InitCommon(dc, style); + + m_buffer = &buffer; + + UseBuffer(); + } + + void Init(wxDC *dc, const wxSize &area, int style = wxBUFFER_CLIENT_AREA) + { + InitCommon(dc, style); + + UseBuffer(area.x, area.y); + } + + // 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(); - // Construct a wxBufferedDC with an internal buffer of 'area' - // (where area is usually something like the size of the window - // being buffered) + // Set and get the style + void SetStyle(int style) { m_style = style; } + int GetStyle() const { return m_style & ~wxBUFFER_USES_SHARED_BUFFER; } - wxBufferedDC( wxDC *dc, const wxSize &area ); +private: + // common part of Init()s + void InitCommon(wxDC *dc, int style) + { + wxASSERT_MSG( !m_dc, wxT("wxBufferedDC already initialised") ); + + m_dc = dc; + m_style = style; + } + + // check that the bitmap is valid and use it + void UseBuffer(wxCoord w = -1, wxCoord h = -1); + + // 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; + + // the buffer (selected in this DC), initially invalid + wxBitmap *m_buffer; + + // the buffering style + int m_style; + + wxSize m_area; + + DECLARE_DYNAMIC_CLASS(wxBufferedDC) + wxDECLARE_NO_COPY_CLASS(wxBufferedDC); +}; - // default copy ctor ok. - // The usually desired action in the dtor is to blit the buffer. +// ---------------------------------------------------------------------------- +// Double buffered PaintDC. +// ---------------------------------------------------------------------------- - ~wxBufferedDC(); +// Creates a double buffered wxPaintDC, optionally allowing the +// user to specify their own buffer to use. +class WXDLLIMPEXP_CORE wxBufferedPaintDC : public wxBufferedDC +{ +public: + // If no bitmap is supplied by the user, a temporary one will be created. + wxBufferedPaintDC(wxWindow *window, wxBitmap& buffer, int style = wxBUFFER_CLIENT_AREA) + : m_paintdc(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.IsOk() ) + Init(&m_paintdc, buffer, style); + else + Init(&m_paintdc, GetBufferedSize(window, style), style); + } + + // 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) + { + // 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, GetBufferedSize(window, style), style); + } - // 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. + // default copy ctor ok. - void Init( wxDC *dc, const wxBitmap &bitmap ); - void Init( wxDC *dc, const wxSize &area ); + virtual ~wxBufferedPaintDC() + { + // We must UnMask here, else by the time the base class + // does it, the PaintDC will have already been destroyed. + UnMask(); + } + +protected: + // return the size needed by the buffer: this depends on whether we're + // buffering just the currently shown part or the total (scrolled) window + static wxSize GetBufferedSize(wxWindow *window, int style) + { + return style & wxBUFFER_VIRTUAL_AREA ? window->GetVirtualSize() + : window->GetClientSize(); + } - // 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. +private: + wxPaintDC m_paintdc; - void UnMask(); + DECLARE_ABSTRACT_CLASS(wxBufferedPaintDC) + wxDECLARE_NO_COPY_CLASS(wxBufferedPaintDC); }; -// ============================================================== -// Double buffered PaintDC. -// -------------------------------------------------------------- -// Creates a double buffered wxPaintDC, optionally allowing the -// user to specify their own buffer to use. +// +// wxAutoBufferedPaintDC is a wxPaintDC in toolkits which have double- +// buffering by default. Otherwise it is a wxBufferedPaintDC. Thus, +// you can only expect it work with a simple constructor that +// accepts single wxWindow* argument. +// +#if wxALWAYS_NATIVE_DOUBLE_BUFFER + #define wxAutoBufferedPaintDCBase wxPaintDC +#else + #define wxAutoBufferedPaintDCBase wxBufferedPaintDC +#endif -class WXDLLEXPORT wxBufferedPaintDC : public wxBufferedDC +class WXDLLIMPEXP_CORE wxAutoBufferedPaintDC : public wxAutoBufferedPaintDCBase { -private: - - wxPaintDC m_paintdc; - public: - wxBufferedPaintDC( wxWindow *window, const wxBitmap &buffer = wxNullBitmap ); + wxAutoBufferedPaintDC(wxWindow* win) + : wxAutoBufferedPaintDCBase(win) + { + wxASSERT_MSG( win->GetBackgroundStyle() == wxBG_STYLE_PAINT, + "You need to call SetBackgroundStyle(wxBG_STYLE_PAINT) in ctor, " + "and also, if needed, paint the background in wxEVT_PAINT handler." + ); + } - // default copy ctor ok. + virtual ~wxAutoBufferedPaintDC() { } - ~wxBufferedPaintDC(); +private: + wxDECLARE_NO_COPY_CLASS(wxAutoBufferedPaintDC); }; -#endif // _WX_DCBUFFER_H_ -// vi:sts=4:sw=4:et +// Check if the window is natively double buffered and will return a wxPaintDC +// if it is, a wxBufferedPaintDC otherwise. It is the caller's responsibility +// to delete the wxDC pointer when finished with it. +inline wxDC* wxAutoBufferedPaintDCFactory(wxWindow* window) +{ + if ( window->IsDoubleBuffered() ) + return new wxPaintDC(window); + else + return new wxBufferedPaintDC(window); +} + +#endif // _WX_DCBUFFER_H_