f94d33c584
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53788 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
69 lines
2.9 KiB
C++
69 lines
2.9 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: src/dfb/dcscreen.cpp
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// Purpose: wxScreenDC implementation
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// Author: Vaclav Slavik
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// Created: 2006-08-16
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// RCS-ID: $Id$
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// Copyright: (c) 2006 REA Elektronik GmbH
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ===========================================================================
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// declarations
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// ===========================================================================
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// ---------------------------------------------------------------------------
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// headers
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// ---------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#include "wx/dcscreen.h"
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#include "wx/dfb/dcscreen.h"
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#include "wx/dfb/private.h"
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// ===========================================================================
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// implementation
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// ===========================================================================
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//-----------------------------------------------------------------------------
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// wxScreenDC
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//-----------------------------------------------------------------------------
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// FIXME: Currently, wxScreenDC doesn't work at all in non-exclusive mode
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// (DFSCL_NORMAL). In this mode, requesting primary surface results
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// in one of the following actions, depending on directfbrc
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// configuration:
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//
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// (1) if force-desktop, a surface is created and used as *background*
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// for the windows managed by DFB WM
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//
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// (2) otherwise, a dummy surface of the right size and format is
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// created, but isn't shown on the screen
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//
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// (3) furthermore, if autoflip-window option is not used and primary
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// surface is requested as single-buffered (which is needed to
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// implement wxScreenDC semantics), a warning is issued in addition
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// to 2); if autoflip-window is used, then a helper thread is
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// created and does periodic flipping, which is even worse
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//
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// 2) and 3) are obviously unsatisfactory. 1) isn't suitable either,
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// because wxScreenDC has to render *on top* of windows.
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//
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// In conclusion, wxScreenDC as currently implemented is only usable
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// for measuring things (e.g. font sizes). For this task, however, it
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// is quite expensive to create in DFSCL_NORMAL mode, because it
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// involves creation of a new surface as big as the screen.
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//
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// The surface, as obtained from GetPrimarySurface(), is double-buffered
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// for the sole purpose of silencing the warning from 3) above.
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IMPLEMENT_ABSTRACT_CLASS(wxScreenDCImpl, wxDFBDCImpl)
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wxScreenDCImpl::wxScreenDCImpl(wxScreenDC *owner)
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: wxDFBDCImpl(owner)
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{
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DFBInit(wxIDirectFB::Get()->GetPrimarySurface());
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}
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