lostgallifreyan <lostgallifre...@gmail.com> writes: > Do the required deletions of device contexts (to spare GDI > resources) get done by code compiled by TCC, or do I have to do > this explicitly, as I do in wxLua, for example?
AFAIK, TCC does not have any specific support for Windows GDI and does not automatically generate code to delete GDI objects. So if Windows requires your program to delete some GDI objects, then you must yourself write the appropriate GDI calls. > I ask because in wxLua, every colour, every pen and brush, is a > DC that must be deleted the instant no longer required, yet the > single GUI example supplied with TCC has a colour (COLORREF) > for text colour that does not appear to have a specific > deletion following it. I don't think Windows GDI requires programs to delete COLORREFs. Generally, if you allocate a resource with some Windows function, then the documentation of that function says how you should free that resource. If you construct a COLORREF with the RGB macro <http://msdn.microsoft.com/en-us/library/dd162937(VS.85).aspx> then this documentation does not say you need to free the returned COLORREF. Likewise with the GetSysColor function <http://msdn.microsoft.com/en-us/library/ms724371(vs.85).aspx>. And the documentation of COLORREF itself <http://msdn.microsoft.com/en-us/library/dd183449(VS.85).aspx> says the COLORREF value just contains the RGB component values in its individual bytes. Thus, no actual resource has been allocated in Windows and there is nothing to free. (With "resource" here, I don't mean the things you compile with Resource Compiler and link into *.exe files.) If you create a brush (HBRUSH) with CreateSolidBrush <http://msdn.microsoft.com/en-us/library/dd183518(VS.85).aspx> then the documentation says you need to delete it with DeleteObject. But if you instead use GetSysColorBrush <http://msdn.microsoft.com/en-us/library/dd144927(VS.85).aspx> then you must not delete the brush. So always read the documentation. Note also that Windows GDI provides ways of drawing different colours while using just one device context and one pen or brush: e.g. GetStockObject(DC_BRUSH) with SetDCBrushColor. That may be faster than creating a separate pen or brush for each colour. You mention Windows 98 though; I don't know whether this works there, as Microsoft has ended support for that OS and removed from the MSDN library apparently all information on which functions are compatible with that. _______________________________________________ Tinycc-devel mailing list Tinycc-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/tinycc-devel
