On 1/25/07, Boris Borcic <[EMAIL PROTECTED]> wrote: > Chris Mellon wrote: > > On 1/25/07, Boris Borcic <[EMAIL PROTECTED]> wrote: > >> Chris Mellon wrote: > > >>>>> > >>>>> Some quick & dirty wxPython code > >>>>> > >>>>> def getTextBitmap(text, font, fgcolor, bgcolor): > >>>>> dc = wx.MemoryDC() > >>>>> dc.SetFont(font) > >>>>> width, height= dc.GetTextExtent(text) > >>>>> bmp = wx.EmptyBitmap(width, height) > >>>>> dc.SelectObject(bmp) > >>>>> dc.SetBackground(wx.Brush(bgcolor)) > >>>>> dc.Clear() > >>>>> dc.SetTextBackground(bgcolor) > >>>>> dc.SetTextForeground(fgcolor) > >>>>> dc.DrawText(text, 0, 0) > >>>>> dc.SelectObject(wx.NullBitmap) > >>>>> return bmp > >>>>> > >>>>> > >>>>> Raw win32 code will look similar but will be much more verbose. > >>>> Thx again for this base. > >>>> > >>>> Quickly testing this, it appears that the result is rendered half a > >>>> pixel off in > >>>> the x-direction. Does this make sense ? Is it possible to position text > >>>> with > >>>> subpixel accuracy ? > <snip> > >> In short, wx._gdi_ fights quite hard to enforce what I am trying to avoid > >> :( I > >> might admire its consistency if it extended to treating both axes > >> similarly... > >> > > > > I have not recently had a need to examine drawn text output this > > closely, but I am familiar with the C++ code that implements the > > drawing and it's a direct wrapping of win32 GDI calls. If it's not > > matching your source text, then the source may be drawn using a > > different method or using one of the alternate engines, like GDI+. > > Maybe. In any case, color separation solves my (sub)problem : the blue layer > from the wx generated model matches the green layer from the app's window, > pixel > for pixel (at least with antialiasing and cleartype on, while writing black on > white). >
That's... extremely interesting. If it works for you, go for it! If you're interested in some other things to try, wx.EmptyBitmap takes a depth parameter you can use to eliminate color. -- http://mail.python.org/mailman/listinfo/python-list
