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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
module gg
import os
import gx
enum FontVariant {
normal = 0
bold
mono
italic
}
struct FTConfig {
font_path string
custom_bold_font_path string
scale f32 = 1.0
font_size int
bytes_normal []byte
bytes_bold []byte
bytes_mono []byte
bytes_italic []byte
}
struct StringToRender {
x int
y int
text string
cfg gx.TextCfg
}
pub fn system_font_path() string {
env_font := os.getenv('VUI_FONT')
if env_font != '' && os.exists(env_font) {
return env_font
}
$if windows {
return 'C:\\Windows\\Fonts\\arial.ttf'
}
mut fonts := ['Ubuntu-R.ttf', 'Arial.ttf', 'LiberationSans-Regular.ttf', 'NotoSans-Regular.ttf',
'FreeSans.ttf', 'DejaVuSans.ttf']
$if macos {
fonts = ['/System/Library/Fonts/SFNS.ttf', '/System/Library/Fonts/SFNSText.ttf',
'/Library/Fonts/Arial.ttf',
]
for font in fonts {
if os.is_file(font) {
return font
}
}
}
$if android {
xml_files := ['/system/etc/system_fonts.xml', '/system/etc/fonts.xml',
'/etc/system_fonts.xml', '/etc/fonts.xml', '/data/fonts/fonts.xml',
'/etc/fallback_fonts.xml',
]
font_locations := ['/system/fonts', '/data/fonts']
for xml_file in xml_files {
if os.is_file(xml_file) && os.is_readable(xml_file) {
xml := os.read_file(xml_file) or { continue }
lines := xml.split('\n')
mut candidate_font := ''
for line in lines {
if line.contains('<font') {
candidate_font = line.all_after('>').all_before('<').trim(' \n\t\r')
if candidate_font.contains('.ttf') {
for location in font_locations {
candidate_path := os.join_path(location, candidate_font)
if os.is_file(candidate_path) && os.is_readable(candidate_path) {
return candidate_path
}
}
}
}
}
}
}
}
s := os.execute('fc-list')
if s.exit_code != 0 {
panic('failed to fetch system fonts')
}
system_fonts := s.output.split('\n')
for line in system_fonts {
for font in fonts {
if line.contains(font) && line.contains(':') {
res := line.all_before(':')
println('Using font $res')
return res
}
}
}
panic('failed to init the font')
}
fn get_font_path_variant(font_path string, variant FontVariant) string {
// TODO: find some way to make this shorter and more eye-pleasant
// NotoSans, LiberationSans, DejaVuSans, Arial and SFNS should work
mut file := os.file_name(font_path)
mut fpath := font_path.replace(file, '')
file = file.replace('.ttf', '')
match variant {
.normal {}
.bold {
if fpath.ends_with('-Regular') {
file = file.replace('-Regular', '-Bold')
} else if file.starts_with('DejaVuSans') {
file += '-Bold'
} else if file.to_lower().starts_with('arial') {
file += 'bd'
} else {
file += '-bold'
}
$if macos {
if os.exists('SFNS-bold') {
file = 'SFNS-bold'
}
}
}
.italic {
if file.ends_with('-Regular') {
file = file.replace('-Regular', '-Italic')
} else if file.starts_with('DejaVuSans') {
file += '-Oblique'
} else if file.to_lower().starts_with('arial') {
file += 'i'
} else {
file += 'Italic'
}
}
.mono {
if !file.ends_with('Mono-Regular') && file.ends_with('-Regular') {
file = file.replace('-Regular', 'Mono-Regular')
} else if file.to_lower().starts_with('arial') {
// Arial has no mono variant
} else {
file += 'Mono'
}
}
}
return fpath + file + '.ttf'
}
fn debug_font_println(s string) {
$if debug_font ? {
println(s)
}
}
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