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v/vlib/gg/text_rendering.v

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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
module gg
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import sokol.sfons
import sokol.sgl
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import gx
import os
enum FontVariant {
normal = 0
bold
mono
italic
}
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struct FT {
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pub:
fons &C.FONScontext
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font_normal int
font_bold int
font_mono int
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font_italic int
scale f32 = 1.0
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}
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struct FTConfig {
font_path string
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custom_bold_font_path string
scale f32 = 1.0
font_size int
bytes_normal []byte
bytes_bold []byte
bytes_mono []byte
bytes_italic []byte
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}
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struct StringToRender {
x int
y int
text string
cfg gx.TextCfg
}
fn new_ft(c FTConfig) ?&FT {
if c.font_path == '' {
if c.bytes_normal.len > 0 {
fons := sfons.create(512, 512, 1)
bytes_normal := c.bytes_normal
bytes_bold := if c.bytes_bold.len > 0 {
c.bytes_bold
} else {
debug_font_println('setting bold variant to normal')
bytes_normal
}
bytes_mono := if c.bytes_mono.len > 0 {
c.bytes_mono
} else {
debug_font_println('setting mono variant to normal')
bytes_normal
}
bytes_italic := if c.bytes_italic.len > 0 {
c.bytes_italic
} else {
debug_font_println('setting italic variant to normal')
bytes_normal
}
return &FT{
fons: fons
font_normal: C.fonsAddFontMem(fons, c'sans', bytes_normal.data, bytes_normal.len,
false)
font_bold: C.fonsAddFontMem(fons, c'sans', bytes_bold.data, bytes_bold.len,
false)
font_mono: C.fonsAddFontMem(fons, c'sans', bytes_mono.data, bytes_mono.len,
false)
font_italic: C.fonsAddFontMem(fons, c'sans', bytes_italic.data, bytes_italic.len,
false)
scale: c.scale
}
} else {
// Load default font
}
}
if c.font_path == '' || !os.exists(c.font_path) {
$if !android {
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println('failed to load font "$c.font_path"')
return none
}
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}
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mut bytes := []byte{}
$if android {
// First try any filesystem paths
bytes = os.read_bytes(c.font_path) or { []byte{} }
if bytes.len == 0 {
// ... then try the APK asset path
bytes = os.read_apk_asset(c.font_path) or {
println('failed to load font "$c.font_path"')
return none
}
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}
} $else {
bytes = os.read_bytes(c.font_path) or {
println('failed to load font "$c.font_path"')
return none
}
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}
bold_path := if c.custom_bold_font_path != '' {
c.custom_bold_font_path
} else {
get_font_path_variant(c.font_path, .bold)
}
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bytes_bold := os.read_bytes(bold_path) or {
debug_font_println('failed to load font "$bold_path"')
bytes
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}
mono_path := get_font_path_variant(c.font_path, .mono)
bytes_mono := os.read_bytes(mono_path) or {
debug_font_println('failed to load font "$mono_path"')
bytes
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}
italic_path := get_font_path_variant(c.font_path, .italic)
bytes_italic := os.read_bytes(italic_path) or {
debug_font_println('failed to load font "$italic_path"')
bytes
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}
fons := sfons.create(512, 512, 1)
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return &FT{
fons: fons
font_normal: C.fonsAddFontMem(fons, c'sans', bytes.data, bytes.len, false)
font_bold: C.fonsAddFontMem(fons, c'sans', bytes_bold.data, bytes_bold.len, false)
font_mono: C.fonsAddFontMem(fons, c'sans', bytes_mono.data, bytes_mono.len, false)
font_italic: C.fonsAddFontMem(fons, c'sans', bytes_italic.data, bytes_italic.len,
false)
scale: c.scale
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}
}
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pub fn (ctx &Context) set_cfg(cfg gx.TextCfg) {
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if !ctx.font_inited {
return
}
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if cfg.bold {
ctx.ft.fons.set_font(ctx.ft.font_bold)
} else if cfg.mono {
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ctx.ft.fons.set_font(ctx.ft.font_mono)
} else if cfg.italic {
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ctx.ft.fons.set_font(ctx.ft.font_italic)
} else {
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ctx.ft.fons.set_font(ctx.ft.font_normal)
}
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scale := if ctx.ft.scale == 0 { f32(1) } else { ctx.ft.scale }
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size := if cfg.mono { cfg.size - 2 } else { cfg.size }
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ctx.ft.fons.set_size(scale * f32(size))
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C.fonsSetAlign(ctx.ft.fons, int(cfg.align) | int(cfg.vertical_align))
color := C.sfons_rgba(cfg.color.r, cfg.color.g, cfg.color.b, cfg.color.a)
if cfg.color.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
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C.fonsSetColor(ctx.ft.fons, color)
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ascender := f32(0.0)
descender := f32(0.0)
lh := f32(0.0)
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ctx.ft.fons.vert_metrics(&ascender, &descender, &lh)
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}
pub fn (ctx &Context) draw_text(x int, y int, text_ string, cfg gx.TextCfg) {
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$if macos {
if ctx.native_rendering {
if cfg.align == gx.align_right {
width := ctx.text_width(text_)
C.darwin_draw_string(x - width, ctx.height - y, text_, cfg)
} else {
C.darwin_draw_string(x, ctx.height - y, text_, cfg)
}
return
}
}
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if !ctx.font_inited {
eprintln('gg: draw_text(): font not initialized')
return
}
// text := text_.trim_space() // TODO remove/optimize
// mut text := text_
// if text.contains('\t') {
// text = text.replace('\t', ' ')
// }
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ctx.set_cfg(cfg)
scale := if ctx.ft.scale == 0 { f32(1) } else { ctx.ft.scale }
C.fonsDrawText(ctx.ft.fons, x * scale, y * scale, &char(text_.str), 0) // TODO: check offsets/alignment
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}
pub fn (ctx &Context) draw_text_def(x int, y int, text string) {
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ctx.draw_text(x, y, text, {})
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}
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/*
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pub fn (mut gg FT) init_font() {
}
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*/
pub fn (ft &FT) flush() {
sfons.flush(ft.fons)
}
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pub fn (ctx &Context) text_width(s string) int {
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$if macos {
if ctx.native_rendering {
return C.darwin_text_width(s)
}
}
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// ctx.set_cfg(cfg) TODO
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if !ctx.font_inited {
return 0
}
mut buf := [4]f32{}
C.fonsTextBounds(ctx.ft.fons, 0, 0, &char(s.str), 0, &buf[0])
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if s.ends_with(' ') {
return int((buf[2] - buf[0]) / ctx.scale) +
ctx.text_width('i') // TODO fix this in fontstash?
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}
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res := int((buf[2] - buf[0]) / ctx.scale)
// println('TW "$s" = $res')
$if macos {
if ctx.native_rendering {
return res * 2
}
}
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return int((buf[2] - buf[0]) / ctx.scale)
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}
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pub fn (ctx &Context) text_height(s string) int {
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// ctx.set_cfg(cfg) TODO
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if !ctx.font_inited {
return 0
}
mut buf := [4]f32{}
C.fonsTextBounds(ctx.ft.fons, 0, 0, &char(s.str), 0, &buf[0])
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return int((buf[3] - buf[1]) / ctx.scale)
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}
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pub fn (ctx &Context) text_size(s string) (int, int) {
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// ctx.set_cfg(cfg) TODO
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if !ctx.font_inited {
return 0, 0
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}
mut buf := [4]f32{}
C.fonsTextBounds(ctx.ft.fons, 0, 0, &char(s.str), 0, &buf[0])
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return int((buf[2] - buf[0]) / ctx.scale), int((buf[3] - buf[1]) / ctx.scale)
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}
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pub fn system_font_path() string {
env_font := os.getenv('VUI_FONT')
if env_font != '' && os.exists(env_font) {
return env_font
}
$if windows {
return 'C:\\Windows\\Fonts\\arial.ttf'
}
mut fonts := ['Ubuntu-R.ttf', 'Arial.ttf', 'LiberationSans-Regular.ttf', 'NotoSans-Regular.ttf',
'FreeSans.ttf', 'DejaVuSans.ttf']
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$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
}
}
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}
$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')
}
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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)
}
}