Sven Luther wrote: > On Mon, Jan 28, 2008 at 02:27:40PM +0000, Andre DRASZIK wrote: >> Hi, >> >> it's not hard to implement everything you want using >> IDirectFBFont::GetStringWidth() and then draw one line at a time. >> Justification can be done using DSTF_TOPLEFT et al. >> Why do you think you can't implement this on top of DirectFB? > > It would seem to me that it is suboptimal to implement it on top, > because you don't know in advance the size of the text. > > So, basically, you would make a guess, see if getstringwidth is bigger > or smaller than the desired width, and then use dichotomy to reach that > size.
You don't know GetStringBreak() :) http://www.directfb.org/docs/DirectFB_Reference_1_1/IDirectFBFont_GetStringBreak.html It seems ideal to me, though I had some more ideas, but I'm not remembering them at the moment. > While doing it internally, you could add the chars one by one, until the > size is reached, and even have code for adding justification and stuff > like that. Argh, adding the chars one by one would be even worse than using GetGlyphExtents() for each character (once). > You could also have another mode to crop the text after a certain width, > altough it is probably possible to do that by cropping surfaces while > blitting. Just use SetClip(). >> For more advanced text rendering you should consider using pango. > > How big a dependency set does pango pull in ? Is this an option for > small-storage applications ? I don't know, but I hope that the string will be prepared as a DFBRectangle and DFBPoint array and drawn using BatchBlit(). That's quite near to the integrated DrawString(). I think pango via cairo uses BatchBlit() for glyphs... If the arrays are stored to render the excact string later again, you might be even faster than DrawString() :) >> You should also remember that the length in bytes may legally be != >> length in characters, since this is UTF-8 encoded text. > > Exact, so one more reason to do it internally, since directfb > getstringwidth knows about the size of the text as it will be ? Yeah, or GetStringBreak(). -- Best regards, Denis Oliver Kropp .------------------------------------------. | DirectFB - Hardware accelerated graphics | | http://www.directfb.org/ | "------------------------------------------" _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
