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61d0326a5b
In case we cannot render a glyph, we want a fallback we can display instead. If we rely on the font itself to provide the fallback character, we have nothing to display if that character is not available. Therefore, add a static fallback that we can use at any time.
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "util.h"
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typedef struct unifont unifont;
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typedef struct unifont_glyph unifont_glyph;
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/*
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* Unifont
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* The unifont API provides a glyph-lookup for bitmap fonts which can be used
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* as fallback if no system-font is available or if you don't want to deal with
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* full font renderers.
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*/
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struct unifont_glyph {
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unsigned int width;
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unsigned int height;
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unsigned int stride;
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unsigned int cwidth;
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const void *data; /* unaligned! */
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};
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int unifont_new(unifont **out);
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unifont *unifont_ref(unifont *u);
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unifont *unifont_unref(unifont *u);
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DEFINE_TRIVIAL_CLEANUP_FUNC(unifont*, unifont_unref);
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unsigned int unifont_get_width(unifont *u);
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unsigned int unifont_get_height(unifont *u);
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unsigned int unifont_get_stride(unifont *u);
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int unifont_lookup(unifont *u, unifont_glyph *out, uint32_t ucs4);
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void unifont_fallback(unifont_glyph *out);
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