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Tue, 27 Oct 2026 13:36:53 +0000 From: Thomas Zimmermann To: deller@gmx.de, simona@ffwll.ch Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, sashiko-reviews@lists.linux.dev, Thomas Zimmermann Subject: [PATCH 0/6] fbcon: Clean up glyph handling on redraws Date: Tue, 27 Oct 2026 14:27:15 +0100 Message-ID: <20261027133646.297856-1-tzimmermann@suse.de> X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Level: X-Spamd-Result: default: False [-11.80 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FREEMAIL_TO(0.00)[gmx.de,ffwll.ch]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; RCPT_COUNT_FIVE(0.00)[6]; FREEMAIL_ENVRCPT(0.00)[gmx.de] X-Spam-Score: -11.80 Fbcon's drawing functions open-code much of the glyph handling. Use font helpers instead. Makes fbcon more consistent and easier to understand. Patch 1 updates fbcon to use unsigned char for glyph buffers. This is consistent with the font code and font_data_t. Patches 2 and 3 update font rotation to return rotated glyphs as font_data_t. A rotated font can now use the same interfaces as the unrotated source font. Fbcon uses this to ref count the font buffer. Patches 4 to 6 update various parts of fbcon to use font helpers instead of open-coding access to font_data_t. Having the rotated font as font_data_t makes this convenient. Tested with fbcon on DRM's bochs driver (qemu). Thomas Zimmermann (6): fbcon: Use unsigned char for glyph data lib/fonts: Provide internal helpers for allocating font_data_t lib/fonts, fbcon: Use font_data_t for rotated fonts fbcon: Refactor size calculation for cursor buffers fbcon: Look up glyphs using the font interface fbcon: Handle characters with no glyph defined in a consistent way drivers/video/fbdev/core/bitblit.c | 82 +++++++++++++++---------- drivers/video/fbdev/core/fbcon.c | 3 +- drivers/video/fbdev/core/fbcon.h | 5 +- drivers/video/fbdev/core/fbcon_ccw.c | 56 +++++++++++------ drivers/video/fbdev/core/fbcon_cw.c | 57 ++++++++++------- drivers/video/fbdev/core/fbcon_rotate.c | 19 +++--- drivers/video/fbdev/core/fbcon_ud.c | 77 +++++++++++++++-------- include/linux/font.h | 5 +- lib/fonts/font.h | 12 ++++ lib/fonts/font_rotate.c | 32 ++++------ lib/fonts/fonts.c | 63 ++++++++++++------- 11 files changed, 254 insertions(+), 157 deletions(-) -- 2.56.0