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Merge branch 'dev' (unicode_support feature)

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Stephen Seo 2022-08-01 12:13:22 +09:00
commit 625daa58e3
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@ -9,7 +9,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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version = "0.3.57" version = "0.3.59"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7b17e741662c70c8bd24ac5c5b18de314a2c26c32bf8346ee1e6f53de919c283" checksum = "ed055ab27f941423197eb86b2035720b1a3ce40504df082cac2ecc6ed73335a1"
dependencies = [ dependencies = [
"js-sys", "js-sys",
"wasm-bindgen", "wasm-bindgen",
@ -2934,9 +3036,18 @@ dependencies = [
[[package]] [[package]]
name = "weezl" name = "weezl"
version = "0.1.6" version = "0.1.7"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9c97e489d8f836838d497091de568cf16b117486d529ec5579233521065bd5e4" checksum = "9193164d4de03a926d909d3bc7c30543cecb35400c02114792c2cae20d5e2dbb"
[[package]]
name = "which"
version = "3.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d011071ae14a2f6671d0b74080ae0cd8ebf3a6f8c9589a2cd45f23126fe29724"
dependencies = [
"libc",
]
[[package]] [[package]]
name = "winapi" name = "winapi"
@ -3018,7 +3129,7 @@ version = "0.3.4"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "463705a63313cd4301184381c5e8042f0a7e9b4bb63653f216311d4ae74690b7" checksum = "463705a63313cd4301184381c5e8042f0a7e9b4bb63653f216311d4ae74690b7"
dependencies = [ dependencies = [
"nom", "nom 7.1.1",
] ]
[[package]] [[package]]

9
Cargo.toml
View file

@ -1,6 +1,6 @@
[package] [package]
name = "mpd_info_screen" name = "mpd_info_screen"
version = "0.2.20" version = "0.3.0"
edition = "2018" edition = "2018"
description = "Displays info on currently playing music from an MPD daemon" description = "Displays info on currently playing music from an MPD daemon"
license = "MIT" license = "MIT"
@ -12,3 +12,10 @@ repository = "https://github.com/Stephen-Seo/mpd_info_screen"
structopt = "0.3" structopt = "0.3"
image = "0.24" image = "0.24"
ggez = "0.7" ggez = "0.7"
freetype = { version = "0.7", optional = true }
[build-dependencies]
bindgen = { version = "0.53", optional = true }
[features]
unicode_support = ["dep:freetype", "dep:bindgen"]

21
README.md
View file

@ -11,9 +11,17 @@ A Rust program that displays info about the currently running MPD server.
The window shows albumart (may be embedded in the audio file, or is a "cover.jpg" in the same directory as the song file), a "time-remaining" The window shows albumart (may be embedded in the audio file, or is a "cover.jpg" in the same directory as the song file), a "time-remaining"
counter, and the filename currently being played counter, and the filename currently being played
By default, unicode characters will not display properly. Build the project with
the `unicode_support` feature enabled to enable fetching fonts from the local
filesystem to display unicode characters properly (if the system is missing a
font, then it will still be displayed incorrectly).
cargo build --release --features unicode_support
# Usage # Usage
mpd_info_screen 0.2.20
mpd_info_screen 0.3.0
USAGE: USAGE:
mpd_info_screen [FLAGS] [OPTIONS] <host> [port] mpd_info_screen [FLAGS] [OPTIONS] <host> [port]
@ -42,7 +50,7 @@ Also note that pressing the H key while displaying text will hide the text.
# Issues / TODO # Issues / TODO
- [ ] UTF-8 Non-ascii font support - [x] UTF-8 Non-ascii font support (Use the `unicode_support` feature to enable; only tested in linux)
- [x] Support for album art not embedded but in the same directory - [x] Support for album art not embedded but in the same directory
## MPD Version ## MPD Version
@ -64,3 +72,12 @@ MIT license.
Uses dependency [structopt](https://crates.io/crates/structopt) which is Uses dependency [structopt](https://crates.io/crates/structopt) which is
licensed under Apache-2.0 or MIT licenses. licensed under Apache-2.0 or MIT licenses.
## Unicode Support Dependencies
Uses dependency
[fontconfig](https://www.freedesktop.org/wiki/Software/fontconfig/) which is
[licensed with this license](https://www.freedesktop.org/software/fontconfig/fontconfig-devel/ln12.html).
Uses dependency [freetype](https://freetype.org) which is
[licensed with this license](https://freetype.org/license.html).

25
build.rs Normal file
View file

@ -0,0 +1,25 @@
#[cfg(feature = "unicode_support")]
use bindgen;
use std::env;
use std::path::PathBuf;
#[cfg(not(feature = "unicode_support"))]
fn main() {}
#[cfg(feature = "unicode_support")]
fn main() {
println!("cargo:rustc-link-search=/usr/lib");
println!("cargo:rustc-link-lib=fontconfig");
println!("cargo:rerun-if-changed=src/bindgen_wrapper.h");
let bindings = bindgen::Builder::default()
.header("src/bindgen_wrapper.h")
.parse_callbacks(Box::new(bindgen::CargoCallbacks))
.generate()
.expect("Unable to generate bindings");
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("unicode_support_bindings.rs"))
.expect("Couldn't write bindings");
}

1
src/bindgen_wrapper.h Normal file
View file

@ -0,0 +1 @@
#include <fontconfig/fontconfig.h>

179
src/display.rs
View file

@ -9,6 +9,7 @@ use ggez::graphics::{
use ggez::{timer, Context, GameError, GameResult}; use ggez::{timer, Context, GameError, GameResult};
use image::io::Reader as ImageReader; use image::io::Reader as ImageReader;
use std::io::Cursor; use std::io::Cursor;
use std::path::PathBuf;
use std::sync::atomic::AtomicBool; use std::sync::atomic::AtomicBool;
use std::sync::{atomic::Ordering, Arc, RwLockReadGuard}; use std::sync::{atomic::Ordering, Arc, RwLockReadGuard};
use std::thread; use std::thread;
@ -49,6 +50,125 @@ fn seconds_to_time(seconds: f64) -> String {
result result
} }
#[cfg(not(feature = "unicode_support"))]
fn string_to_text(
string: String,
loaded_fonts: &mut Vec<(PathBuf, Font)>,
ctx: &mut Context,
) -> Text {
Text::new(TextFragment::from(string))
}
#[cfg(feature = "unicode_support")]
fn string_to_text(
string: String,
loaded_fonts: &mut Vec<(PathBuf, Font)>,
ctx: &mut Context,
) -> Text {
use super::unicode_support;
let mut text = Text::default();
let mut current_fragment = TextFragment::default();
if string.is_ascii() {
current_fragment.text = string;
text.add(current_fragment);
return text;
}
let find_font =
|c: char, loaded_fonts: &mut Vec<(PathBuf, Font)>, ctx: &mut Context| -> Option<usize> {
for (idx, (path, _)) in loaded_fonts.iter().enumerate() {
let result = unicode_support::font_has_char(c, path);
if result.is_ok() && result.unwrap() {
return Some(idx);
}
}
let find_result = unicode_support::get_matching_font_from_char(c);
if let Ok(path) = find_result {
let new_font = Font::new(ctx, &path);
if let Ok(font) = new_font {
loaded_fonts.push((path, font));
return Some(loaded_fonts.len() - 1);
} else {
println!("Failed to load {:?}: {:?}", &path, new_font);
}
} else {
println!("Failed to find font for {}", c);
}
None
};
let mut prev_is_ascii = true;
for c in string.chars() {
if c.is_ascii() {
if prev_is_ascii {
current_fragment.text.push(c);
} else {
if !current_fragment.text.is_empty() {
text.add(current_fragment);
current_fragment = Default::default();
}
current_fragment.text.push(c);
}
prev_is_ascii = true;
} else {
let idx_opt = find_font(c, loaded_fonts, ctx);
if prev_is_ascii {
if let Some(idx) = idx_opt {
if !current_fragment.text.is_empty() {
text.add(current_fragment);
current_fragment = Default::default();
}
let (_, font) = loaded_fonts[idx];
current_fragment.font = Some(font);
}
current_fragment.text.push(c);
} else {
if let Some(idx) = idx_opt {
let font = loaded_fonts[idx].1;
if let Some(current_font) = current_fragment.font {
if current_font == font {
current_fragment.text.push(c);
} else {
if !current_fragment.text.is_empty() {
text.add(current_fragment);
current_fragment = Default::default();
}
current_fragment.text.push(c);
current_fragment.font = Some(font);
}
} else if current_fragment.text.is_empty() {
current_fragment.text.push(c);
current_fragment.font = Some(font);
} else {
text.add(current_fragment);
current_fragment = Default::default();
current_fragment.text.push(c);
current_fragment.font = Some(font);
}
} else {
if !current_fragment.text.is_empty() && current_fragment.font.is_some() {
text.add(current_fragment);
current_fragment = Default::default();
}
current_fragment.text.push(c);
}
}
prev_is_ascii = false;
}
}
if !current_fragment.text.is_empty() {
text.add(current_fragment);
}
text
}
pub struct MPDDisplay { pub struct MPDDisplay {
opts: Opt, opts: Opt,
mpd_handler: Result<MPDHandler, String>, mpd_handler: Result<MPDHandler, String>,
@ -63,10 +183,13 @@ pub struct MPDDisplay {
album_art: Option<Image>, album_art: Option<Image>,
album_art_draw_transform: Option<Transform>, album_art_draw_transform: Option<Transform>,
filename_text: Text, filename_text: Text,
filename_string_cache: String,
filename_transform: Transform, filename_transform: Transform,
artist_text: Text, artist_text: Text,
artist_string_cache: String,
artist_transform: Transform, artist_transform: Transform,
title_text: Text, title_text: Text,
title_string_cache: String,
title_transform: Transform, title_transform: Transform,
timer_text: Text, timer_text: Text,
timer_transform: Transform, timer_transform: Transform,
@ -78,6 +201,7 @@ pub struct MPDDisplay {
hide_text: bool, hide_text: bool,
tried_album_art_in_dir: bool, tried_album_art_in_dir: bool,
mpd_play_state: MPDPlayState, mpd_play_state: MPDPlayState,
loaded_fonts: Vec<(PathBuf, Font)>,
} }
impl MPDDisplay { impl MPDDisplay {
@ -111,6 +235,10 @@ impl MPDDisplay {
hide_text: false, hide_text: false,
tried_album_art_in_dir: false, tried_album_art_in_dir: false,
mpd_play_state: MPDPlayState::Playing, mpd_play_state: MPDPlayState::Playing,
loaded_fonts: Vec::new(),
filename_string_cache: String::new(),
artist_string_cache: String::new(),
title_string_cache: String::new(),
} }
} }
@ -314,13 +442,12 @@ impl MPDDisplay {
break; break;
} }
text.set_font( for fragment in text.fragments_mut() {
Font::default(), fragment.scale = Some(PxScale {
PxScale {
x: current_x, x: current_x,
y: current_y, y: current_y,
}, });
); }
width = text.width(ctx); width = text.width(ctx);
height = text.height(ctx); height = text.height(ctx);
@ -346,13 +473,12 @@ impl MPDDisplay {
} else { } else {
let diff_scale_y = current_y / height * timer_height; let diff_scale_y = current_y / height * timer_height;
let current_x = current_x * diff_scale_y / current_y; let current_x = current_x * diff_scale_y / current_y;
text.set_font( for fragment in text.fragments_mut() {
Font::default(), fragment.scale = Some(PxScale {
PxScale {
x: current_x, x: current_x,
y: diff_scale_y, y: diff_scale_y,
}, });
); }
*timer_x = current_x; *timer_x = current_x;
*timer_y = diff_scale_y; *timer_y = diff_scale_y;
// width = text.width(ctx); // not really used after this // width = text.width(ctx); // not really used after this
@ -600,7 +726,14 @@ impl EventHandler for MPDDisplay {
} else { } else {
self.mpd_play_state = MPDPlayState::Playing; self.mpd_play_state = MPDPlayState::Playing;
if !shared.title.is_empty() { if !shared.title.is_empty() {
self.title_text = Text::new(shared.title.clone()); if shared.title != self.title_string_cache {
self.title_string_cache = shared.title.clone();
self.title_text = string_to_text(
shared.title.clone(),
&mut self.loaded_fonts,
ctx,
);
}
} else { } else {
self.dirty_flag self.dirty_flag
.as_ref() .as_ref()
@ -608,7 +741,14 @@ impl EventHandler for MPDDisplay {
.store(true, Ordering::Relaxed); .store(true, Ordering::Relaxed);
} }
if !shared.artist.is_empty() { if !shared.artist.is_empty() {
self.artist_text = Text::new(shared.artist.clone()); if shared.artist != self.artist_string_cache {
self.artist_string_cache = shared.artist.clone();
self.artist_text = string_to_text(
shared.artist.clone(),
&mut self.loaded_fonts,
ctx,
);
}
} else { } else {
self.dirty_flag self.dirty_flag
.as_ref() .as_ref()
@ -616,11 +756,18 @@ impl EventHandler for MPDDisplay {
.store(true, Ordering::Relaxed); .store(true, Ordering::Relaxed);
} }
if !shared.filename.is_empty() { if !shared.filename.is_empty() {
if self.filename_text.contents() != shared.filename { if shared.filename != self.filename_string_cache {
self.album_art = None; self.filename_string_cache = shared.filename.clone();
self.tried_album_art_in_dir = false; if self.filename_text.contents() != shared.filename {
self.album_art = None;
self.tried_album_art_in_dir = false;
}
self.filename_text = string_to_text(
shared.filename.clone(),
&mut self.loaded_fonts,
ctx,
);
} }
self.filename_text = Text::new(shared.filename.clone());
} else { } else {
self.dirty_flag self.dirty_flag
.as_ref() .as_ref()

7
src/main.rs
View file

@ -1,13 +1,17 @@
mod debug_log; mod debug_log;
mod display; mod display;
mod mpd_handler; mod mpd_handler;
#[cfg(feature = "unicode_support")]
mod unicode_support;
use ggez::conf::{WindowMode, WindowSetup}; use ggez::conf::{WindowMode, WindowSetup};
use ggez::event::winit_event::{ElementState, KeyboardInput, ModifiersState}; use ggez::event::winit_event::{ElementState, KeyboardInput, ModifiersState};
use ggez::event::{self, ControlFlow, EventHandler}; use ggez::event::{self, ControlFlow, EventHandler};
use ggez::filesystem::mount;
use ggez::graphics::{self, Rect}; use ggez::graphics::{self, Rect};
use ggez::{ContextBuilder, GameError}; use ggez::{ContextBuilder, GameError};
use std::net::Ipv4Addr; use std::net::Ipv4Addr;
use std::path::PathBuf;
use std::thread; use std::thread;
use std::time::{Duration, Instant}; use std::time::{Duration, Instant};
use structopt::StructOpt; use structopt::StructOpt;
@ -61,6 +65,9 @@ fn main() -> Result<(), String> {
.build() .build()
.expect("Failed to create ggez context"); .expect("Failed to create ggez context");
// mount "/" read-only so that fonts can be loaded via absolute paths
mount(&mut ctx, &PathBuf::from("/"), true);
let mut display = display::MPDDisplay::new(&mut ctx, opt.clone()); let mut display = display::MPDDisplay::new(&mut ctx, opt.clone());
let mut modifiers_state: ModifiersState = ModifiersState::default(); let mut modifiers_state: ModifiersState = ModifiersState::default();

5
src/unicode_support.rs Normal file
View file

@ -0,0 +1,5 @@
mod fontconfig;
mod freetype;
pub use self::freetype::font_has_char;
pub use fontconfig::{get_matching_font_from_char, get_matching_font_from_str};

348
src/unicode_support/fontconfig.rs Normal file
View file

@ -0,0 +1,348 @@
use std::{path::PathBuf, str::FromStr};
mod ffi {
use std::{ffi::CStr, os::raw::c_int};
mod bindgen {
#![allow(non_upper_case_globals)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
#![allow(dead_code)]
#![allow(deref_nullptr)]
include!(concat!(env!("OUT_DIR"), "/unicode_support_bindings.rs"));
}
pub struct FcConfigWr {
config: *mut bindgen::FcConfig,
}
impl Drop for FcConfigWr {
fn drop(&mut self) {
if !self.config.is_null() {
unsafe {
bindgen::FcConfigDestroy(self.config);
}
}
}
}
impl FcConfigWr {
pub fn new() -> Result<Self, String> {
let config = unsafe { bindgen::FcInitLoadConfigAndFonts() };
if config.is_null() {
Err(String::from("Failed to create FcConfig"))
} else {
Ok(Self { config })
}
}
pub fn get(&mut self) -> *mut bindgen::FcConfig {
self.config
}
pub fn apply_pattern_to_config(&mut self, pattern: &mut FcPatternWr) -> bool {
unsafe {
bindgen::FcConfigSubstitute(
self.config,
pattern.get(),
bindgen::_FcMatchKind_FcMatchPattern,
) == bindgen::FcTrue as bindgen::FcBool
}
}
pub fn font_match(&mut self, pattern: &mut FcPatternWr) -> Result<FcPatternWr, String> {
unsafe {
let mut result: bindgen::FcResult = 0 as bindgen::FcResult;
let result_pattern = bindgen::FcFontMatch(
self.config,
pattern.get(),
&mut result as *mut bindgen::FcResult,
);
if result != bindgen::_FcResult_FcResultMatch {
if !result_pattern.is_null() {
bindgen::FcPatternDestroy(result_pattern);
return Err(String::from("Failed to FcFontMatch (FcResult is not FcResultMatch; result_pattern is not null)"));
} else {
return Err(format!(
"Failed to FcFontMatch (FcResult is not FcResultMatch; {:?})",
result
));
}
} else if result_pattern.is_null() {
return Err(String::from(
"Failed to FcFontMatch (result_pattern is null)",
));
}
Ok(FcPatternWr {
pattern: result_pattern,
})
}
}
}
pub struct FcCharSetWr {
charset: *mut bindgen::FcCharSet,
}
impl Drop for FcCharSetWr {
fn drop(&mut self) {
if !self.charset.is_null() {
unsafe {
bindgen::FcCharSetDestroy(self.charset);
}
}
}
}
impl FcCharSetWr {
pub fn new_with_str(s: &str) -> Result<Self, String> {
let charset;
unsafe {
let charset_ptr = bindgen::FcCharSetCreate();
if charset_ptr.is_null() {
return Err(String::from("Failed to create FcCharSet with str"));
}
charset = FcCharSetWr {
charset: charset_ptr,
};
for c in s.chars() {
if bindgen::FcCharSetAddChar(charset.charset, c as u32)
== bindgen::FcFalse as bindgen::FcBool
{
return Err(String::from("Failed to add chars from str into FcCharSet"));
}
}
}
Ok(charset)
}
pub fn new_with_char(c: char) -> Result<Self, String> {
let charset;
unsafe {
let charset_ptr = bindgen::FcCharSetCreate();
if charset_ptr.is_null() {
return Err(String::from("Failed to create FcCharSet with char"));
}
charset = FcCharSetWr {
charset: charset_ptr,
};
if bindgen::FcCharSetAddChar(charset.charset, c as u32)
== bindgen::FcFalse as bindgen::FcBool
{
return Err(String::from("Failed to add char to FcCharSet"));
}
}
Ok(charset)
}
pub fn get(&mut self) -> *mut bindgen::FcCharSet {
self.charset
}
}
pub struct FcPatternWr {
pattern: *mut bindgen::FcPattern,
}
impl Drop for FcPatternWr {
fn drop(&mut self) {
if !self.pattern.is_null() {
unsafe {
bindgen::FcPatternDestroy(self.pattern);
}
}
}
}
impl FcPatternWr {
pub fn new_with_charset(c: &mut FcCharSetWr) -> Result<Self, String> {
let pattern;
unsafe {
let pattern_ptr = bindgen::FcPatternCreate();
if pattern_ptr.is_null() {
return Err(String::from("Failed to FcPatternCreate"));
}
pattern = Self {
pattern: pattern_ptr,
};
bindgen::FcDefaultSubstitute(pattern.pattern);
let value = bindgen::FcValue {
type_: bindgen::_FcType_FcTypeCharSet,
u: bindgen::_FcValue__bindgen_ty_1 { c: c.get() },
};
if bindgen::FcPatternAdd(
pattern.pattern,
bindgen::FC_CHARSET as *const _ as *const i8,
value,
bindgen::FcTrue as bindgen::FcBool,
) == bindgen::FcFalse as bindgen::FcBool
{
return Err(String::from("Failed to add FcCharSet to new Pattern"));
}
}
Ok(pattern)
}
pub fn get(&mut self) -> *mut bindgen::FcPattern {
self.pattern
}
pub fn get_count(&self) -> c_int {
unsafe { bindgen::FcPatternObjectCount(self.pattern) }
}
pub fn filter_to_filenames(&self) -> Result<Self, String> {
let pattern;
unsafe {
let mut file_object_set_filter = FcObjectSetWr::new_file_object_set()?;
let pattern_ptr =
bindgen::FcPatternFilter(self.pattern, file_object_set_filter.get());
if pattern_ptr.is_null() {
return Err(String::from("Failed to FcPatternFilter"));
}
pattern = Self {
pattern: pattern_ptr,
};
}
Ok(pattern)
}
pub fn get_filename_contents(&self) -> Result<Vec<String>, String> {
let mut vec: Vec<String> = Vec::new();
let count = self.get_count();
unsafe {
let mut value = bindgen::FcValue {
type_: 0,
u: bindgen::_FcValue__bindgen_ty_1 { i: 0 },
};
for i in 0..count {
if bindgen::FcPatternGet(
self.pattern,
bindgen::FC_FILE as *const _ as *const i8,
i,
&mut value as *mut bindgen::FcValue,
) == bindgen::_FcResult_FcResultMatch
{
if value.type_ == bindgen::_FcType_FcTypeString {
let cs = CStr::from_ptr(value.u.s as *const i8);
vec.push(
cs.to_str()
.map_err(|_| String::from("Failed to convert CStr to String"))?
.to_owned(),
);
}
}
}
}
Ok(vec)
}
}
struct FcObjectSetWr {
object_set: *mut bindgen::FcObjectSet,
}
impl Drop for FcObjectSetWr {
fn drop(&mut self) {
unsafe {
if !self.object_set.is_null() {
bindgen::FcObjectSetDestroy(self.object_set);
}
}
}
}
impl FcObjectSetWr {
pub fn new_file_object_set() -> Result<Self, String> {
let object_set;
unsafe {
let object_set_ptr = bindgen::FcObjectSetCreate();
if object_set_ptr.is_null() {
return Err(String::from("Failed to FcObjectSetCreate"));
}
object_set = Self {
object_set: object_set_ptr,
};
if bindgen::FcObjectSetAdd(
object_set.object_set,
bindgen::FC_FILE as *const _ as *const i8,
) == bindgen::FcFalse as bindgen::FcBool
{
return Err(String::from(
"Failed to add \"FC_FILE\" with FcObjectSetAdd",
));
}
}
Ok(object_set)
}
pub fn get(&mut self) -> *mut bindgen::FcObjectSet {
self.object_set
}
}
}
pub fn get_matching_font_from_str(s: &str) -> Result<PathBuf, String> {
let mut config = ffi::FcConfigWr::new()?;
let mut charset = ffi::FcCharSetWr::new_with_str(s)?;
let mut search_pattern = ffi::FcPatternWr::new_with_charset(&mut charset)?;
if !config.apply_pattern_to_config(&mut search_pattern) {
return Err(String::from("Failed to apply_pattern_to_config"));
}
let result_pattern = config.font_match(&mut search_pattern)?;
let filtered_pattern = result_pattern.filter_to_filenames()?;
let result_vec = filtered_pattern.get_filename_contents()?;
if result_vec.is_empty() {
Err(String::from(
"Empty result_vec for get_matching_font_from_str",
))
} else {
PathBuf::from_str(&result_vec[0]).map_err(|e| e.to_string())
}
}
pub fn get_matching_font_from_char(c: char) -> Result<PathBuf, String> {
let mut config = ffi::FcConfigWr::new()?;
let mut charset = ffi::FcCharSetWr::new_with_char(c)?;
let mut search_pattern = ffi::FcPatternWr::new_with_charset(&mut charset)?;
if !config.apply_pattern_to_config(&mut search_pattern) {
return Err(String::from("Failed to apply_pattern_to_config"));
}
let result_pattern = config.font_match(&mut search_pattern)?;
let filtered_pattern = result_pattern.filter_to_filenames()?;
let result_vec = filtered_pattern.get_filename_contents()?;
if result_vec.is_empty() {
Err(String::from(
"Empty result_vec for get_matching_font_from_char",
))
} else {
PathBuf::from_str(&result_vec[0]).map_err(|e| e.to_string())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_ascii_fetching() {
let fetched_path =
get_matching_font_from_char('a').expect("Should be able to find match for 'a'");
println!("{:?}", fetched_path);
}
}

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src/unicode_support/freetype.rs Normal file
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use std::path::Path;
mod ffi {
use freetype::freetype::{
FT_Done_Face, FT_Done_Library, FT_Face, FT_FaceRec_, FT_Get_Char_Index, FT_Init_FreeType,
FT_Library, FT_ModuleRec_, FT_Open_Args, FT_Open_Face, FT_Parameter_, FT_StreamRec_,
FT_OPEN_PATHNAME,
};
use std::ffi::CString;
use std::path::Path;
pub struct FTLibrary {
library: FT_Library,
}
impl Drop for FTLibrary {
fn drop(&mut self) {
if !self.library.is_null() {
unsafe {
FT_Done_Library(self.library);
}
}
}
}
impl FTLibrary {
pub fn new() -> Option<FTLibrary> {
unsafe {
let mut library_ptr: FT_Library = 0 as FT_Library;
if FT_Init_FreeType(&mut library_ptr) != 0 {
Some(FTLibrary {
library: library_ptr,
})
} else {
None
}
}
}
pub fn get(&self) -> FT_Library {
self.library
}
}
pub struct FTOpenArgs {
args: FT_Open_Args,
pathname: Option<CString>,
}
impl FTOpenArgs {
pub fn new_with_path(path: &Path) -> Self {
unsafe {
let cstring: CString = CString::from_vec_unchecked(
path.as_os_str().to_str().unwrap().as_bytes().to_vec(),
);
let args = FT_Open_Args {
flags: FT_OPEN_PATHNAME,
memory_base: 0 as *const u8,
memory_size: 0,
pathname: cstring.as_ptr() as *mut i8,
stream: 0 as *mut FT_StreamRec_,
driver: 0 as *mut FT_ModuleRec_,
num_params: 0,
params: 0 as *mut FT_Parameter_,
};
FTOpenArgs {
args,
pathname: Some(cstring),
}
}
}
pub fn get_args(&self) -> FT_Open_Args {
self.args
}
pub fn get_ptr(&mut self) -> *mut FT_Open_Args {
&mut self.args as *mut FT_Open_Args
}
}
pub struct FTFaces {
faces: Vec<FT_Face>,
}
impl Drop for FTFaces {
fn drop(&mut self) {
for face in &self.faces {
unsafe {
FT_Done_Face(*face);
}
}
}
}
impl FTFaces {
pub fn new(library: &FTLibrary, args: &mut FTOpenArgs) -> Result<FTFaces, ()> {
let mut faces = FTFaces { faces: Vec::new() };
unsafe {
let count;
let mut face: FT_Face = 0 as FT_Face;
// first get number of faces
let mut result = FT_Open_Face(
library.get(),
args.get_ptr(),
-1,
&mut face as *mut *mut FT_FaceRec_,
);
if result != 0 {
FT_Done_Face(face);
return Err(());
}
count = (*face).num_faces;
for i in 0..count {
result = FT_Open_Face(
library.get(),
args.get_ptr(),
i,
&mut face as *mut *mut FT_FaceRec_,
);
if result != 0 {
FT_Done_Face(face);
return Err(());
}
faces.faces.push(face);
}
}
Ok(faces)
}
pub fn has_char(&self, c: char) -> bool {
let char_value: u64 = c as u64;
for face in &self.faces {
unsafe {
let result = FT_Get_Char_Index(*face, char_value);
if result != 0 {
return true;
}
}
}
false
}
}
}
pub fn font_has_char(c: char, font_path: &Path) -> Result<bool, ()> {
let library = ffi::FTLibrary::new().ok_or(())?;
let mut args = ffi::FTOpenArgs::new_with_path(font_path);
let faces = ffi::FTFaces::new(&library, &mut args)?;
Ok(faces.has_char(c))
}