| | 1 | ///////////////////////////////////////////////////////////////////////////// |
| | 2 | // Name: src/dfb/dcscreen.cpp |
| | 3 | // Purpose: wxScreenDC implementation |
| | 4 | // Author: Vaclav Slavik |
| | 5 | // Created: 2006-08-16 |
| | 6 | // Copyright: (c) 2006 REA Elektronik GmbH |
| | 7 | // Licence: wxWindows licence |
| | 8 | ///////////////////////////////////////////////////////////////////////////// |
| | 9 | |
| | 10 | // =========================================================================== |
| | 11 | // declarations |
| | 12 | // =========================================================================== |
| | 13 | |
| | 14 | // --------------------------------------------------------------------------- |
| | 15 | // headers |
| | 16 | // --------------------------------------------------------------------------- |
| | 17 | |
| | 18 | // For compilers that support precompilation, includes "wx.h". |
| | 19 | #include "wx/wxprec.h" |
| | 20 | |
| | 21 | #include "wx/dcscreen.h" |
| | 22 | #include "wx/dfb/dcscreen.h" |
| | 23 | #include "wx/dfb/private.h" |
| | 24 | |
| | 25 | // =========================================================================== |
| | 26 | // implementation |
| | 27 | // =========================================================================== |
| | 28 | |
| | 29 | //----------------------------------------------------------------------------- |
| | 30 | // wxScreenDC |
| | 31 | //----------------------------------------------------------------------------- |
| | 32 | |
| | 33 | // FIXME: Currently, wxScreenDC doesn't work at all in non-exclusive mode |
| | 34 | // (DFSCL_NORMAL). In this mode, requesting primary surface results |
| | 35 | // in one of the following actions, depending on directfbrc |
| | 36 | // configuration: |
| | 37 | // |
| | 38 | // (1) if force-desktop, a surface is created and used as *background* |
| | 39 | // for the windows managed by DFB WM |
| | 40 | // |
| | 41 | // (2) otherwise, a dummy surface of the right size and format is |
| | 42 | // created, but isn't shown on the screen |
| | 43 | // |
| | 44 | // (3) furthermore, if autoflip-window option is not used and primary |
| | 45 | // surface is requested as single-buffered (which is needed to |
| | 46 | // implement wxScreenDC semantics), a warning is issued in addition |
| | 47 | // to 2); if autoflip-window is used, then a helper thread is |
| | 48 | // created and does periodic flipping, which is even worse |
| | 49 | // |
| | 50 | // 2) and 3) are obviously unsatisfactory. 1) isn't suitable either, |
| | 51 | // because wxScreenDC has to render *on top* of windows. |
| | 52 | // |
| | 53 | // In conclusion, wxScreenDC as currently implemented is only usable |
| | 54 | // for measuring things (e.g. font sizes). For this task, however, it |
| | 55 | // is quite expensive to create in DFSCL_NORMAL mode, because it |
| | 56 | // involves creation of a new surface as big as the screen. |
| | 57 | // |
| | 58 | // The surface, as obtained from GetPrimarySurface(), is double-buffered |
| | 59 | // for the sole purpose of silencing the warning from 3) above. |
| | 60 | |
| | 61 | IMPLEMENT_ABSTRACT_CLASS(wxScreenDCImpl, wxDFBDCImpl) |
| | 62 | |
| | 63 | wxScreenDCImpl::wxScreenDCImpl(wxScreenDC *owner) |
| | 64 | : wxDFBDCImpl(owner) |
| | 65 | { |
| | 66 | DFBInit(wxIDirectFB::Get()->GetPrimarySurface()); |
| | 67 | } |
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