Evgeny Kolesnikov wrote: > Here is the path for anti-aliased fonts. > > At first I was completely against antialiasing support because of performance impact. But it being optional decreases the later. However there is one problem: your patch relies on text_layer to be RGBA8888 which was a mistake. RGBA8888 for text layer is vastly inefficient especially on 16-bit framebuffer and CPUs with small cache. I had plans to switch it to indexed color. Do you really need 8bits and 4 aren't enough? If 4 are enough we could make text_layer IA44 (indexed-4 bits, alpha 4 bits) if you need 8 bits we can do IA88. I'm not sure which one is faster: firs one is more cache-efficient, second one requires less ALU. Are you interested in implementing this? > Everything my path does is: > > 1) Enriches grub-mkfont with ability to write (and debug with -vv) > pff3 (as I call it now) font format. There are 2 differences between > pff2 and pff3 formats: FILE magic (PFF2 becomes PFF3) and DATA block > entires size multiples by 8 (1bit -> 8bit). In other words PFF3 stores > 8-bit alpha channel instead of 1-bit. > And grub-mkfont will still be able to generate pff2, of course. > > And by default grub-mkfont should generate not antialiased font for performance reasons. But user or theme creator can choose to use antialiased fonts if they wish. > 2) Adds pff3 format parsing and drawing ability to font.c. > And of course pff2 still there; actually as you can understand 95% of > code is reused because of such a little differences in formats. > > Drawing itself implemented pretty straightforward: on each glyph > drawing A channel (from glyph) and foreground color are converted to > RGBA buffer and then blended in RGBA_8888 mode. > > As far as I understand writing custom blitter for now will not worth it > in terms of efficiency. > > > When I test it I was unable to see performance difference between 1-bit > fonts and my version. They both flickers a little. > > Files affected: /font/font.c and /util/grub-mkfont.c. > > > ------------------------------------------------------------------------ > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > http://lists.gnu.org/mailman/listinfo/grub-devel
-- Regards Vladimir 'φ-coder/phcoder' Serbinenko
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