diff options
| author | Thomas Zimmermann <tzimmermann@suse.de> | 2026-04-07 11:23:19 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2026-04-07 17:38:07 +0200 |
| commit | cfa72955a029cd79433694cac6b5630788609cd4 (patch) | |
| tree | 92e0af2b946b9f427bbac94a0352d1df4fbddc37 /include/linux | |
| parent | a30e9e6b018f40941a626ff77e0bf35c015038fa (diff) | |
lib/fonts: Implement font rotation
Move the core of fbcon's font-rotation code to the font library as
the new helper font_data_rotate(). The code can rotate in steps of
90°. For completeness, it also copies the glyph data for multiples
of 360°.
Bring back the memset optimization. A memset to 0 again clears the
whole glyph output buffer. Then use the internal rotation helpers on
the cleared output. Fbcon's original implementation worked like this,
but lost it during refactoring.
Replace fbcon's font-rotation code with the new implementations.
All that's left to do for fbcon is to maintain its internal fbcon
state.
v2:
- fix typos
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/font.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/font.h b/include/linux/font.h index 0a240dd70422..6845f02d739a 100644 --- a/include/linux/font.h +++ b/include/linux/font.h @@ -111,6 +111,9 @@ void font_glyph_rotate_180(const unsigned char *glyph, unsigned int width, unsig unsigned char *out); void font_glyph_rotate_270(const unsigned char *glyph, unsigned int width, unsigned int height, unsigned char *out); +unsigned char *font_data_rotate(font_data_t *fd, unsigned int width, unsigned int height, + unsigned int charcount, unsigned int steps, + unsigned char *buf, size_t *bufsize); /* * Font description |