From 8643d47338273c85ff9ae2c8bd8452fffc190535 Mon Sep 17 00:00:00 2001
From: Jacob Lifshay <programmerjake@gmail.com>
Date: Thu, 1 Jan 2026 23:14:08 -0800
Subject: [PATCH] port Font to Rust

---
 src/main.rs | 512 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 512 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 5d7e01c..73c6bb9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,517 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later
 // See Notices.txt for copyright information
+use non_nan_float::NonNaNF32;
+
 mod quad_tree;
 
+mod non_nan_float {
+    #[derive(Default, PartialEq, PartialOrd, Clone, Copy)]
+    pub(crate) struct NonNaNF32(f32);
+
+    impl std::fmt::Debug for NonNaNF32 {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            self.0.fmt(f)
+        }
+    }
+
+    impl std::fmt::Display for NonNaNF32 {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            self.0.fmt(f)
+        }
+    }
+
+    impl NonNaNF32 {
+        pub(crate) const fn new(v: f32) -> Option<Self> {
+            if v.is_nan() { None } else { Some(Self(v)) }
+        }
+        pub(crate) const fn get(self) -> f32 {
+            self.0
+        }
+    }
+
+    impl std::hash::Hash for NonNaNF32 {
+        fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+            if self.0 == 0.0 { 0.0 } else { self.0 }
+                .to_bits()
+                .hash(state);
+        }
+    }
+
+    impl Eq for NonNaNF32 {}
+
+    impl Ord for NonNaNF32 {
+        fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+            self.partial_cmp(other).expect("known to be non-NaN")
+        }
+    }
+}
+
+macro_rules! make_enum_font {
+    (
+        enum $Font:ident {
+            #[other]
+            $Other:ident $other_body:tt,
+            $(#[group]
+            $KnownFontGroup:ident {
+                $(#[name = $known_font_name:literal, size = $known_font_size:literal]
+                $KnownFont:ident,)*
+            },)*
+        }
+    ) => {
+        #[derive(Hash, PartialEq, Eq, PartialOrd, Ord, Debug, Clone)]
+        enum $Font {
+            $Other $other_body,
+            $($($KnownFont,)*)*
+        }
+
+        #[derive(Hash, PartialEq, Eq, PartialOrd, Ord, Debug, Copy, Clone)]
+        enum KnownFontGroup {
+            $($KnownFontGroup,)*
+        }
+
+        impl KnownFontGroup {
+            const fn fonts(self) -> &'static [Font] {
+                match self {
+                    $(Self::$KnownFontGroup => &[$(Font::$KnownFont,)*],)*
+                }
+            }
+            const INSN_CODE_FONT_GROUPS: &[Self] = &[Self::InsnCode, Self::InsnCodeSubscript];
+        }
+
+        impl $Font {
+            const fn size(&self) -> f32 {
+                match *self {
+                    Self::$Other { size, .. } => size.get(),
+                    $($(Self::$KnownFont => $known_font_size,)*)*
+                }
+            }
+            const fn font_name(&self) -> &str {
+                match self {
+                    Self::$Other { font_name, .. } => font_name,
+                    $($(Self::$KnownFont => $known_font_name,)*)*
+                }
+            }
+            const fn known_font_group(&self) -> Option<KnownFontGroup> {
+                match self {
+                    Self::$Other { .. } => None,
+                    $($(Self::$KnownFont => Some(KnownFontGroup::$KnownFontGroup),)*)*
+                }
+            }
+            const fn line_height(&self) -> f32 {
+                match self {
+                    Self::$Other { .. } => self.line_height_helper(),
+                    $($(Self::$KnownFont => const { Self::$KnownFont.line_height_helper() },)*)*
+                }
+            }
+        }
+    };
+}
+
+make_enum_font! {
+    enum Font {
+        #[other]
+        Other {
+            font_name: Box<str>,
+            size: NonNaNF32,
+        },
+        #[group]
+        InsnHeader {
+            #[name = "YDJYQV+DejaVuSansCondensed-BoldOblique", size = 9.963]
+            InsnHeader,
+        },
+        #[group]
+        RtlFnHeader {
+            #[name = "APUYSQ+zcoN-Regular", size = 9.963]
+            RtlFnHeader,
+        },
+        #[group]
+        PageHeader {
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 9.963]
+            PageHeader,
+        },
+        #[group]
+        PageFooter {
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 4.981]
+            PageFooter,
+        },
+        #[group]
+        InsnDesc {
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 8.966]
+            InsnDesc0,
+            #[name = "FZTIYT+CMMI9", size = 8.966]
+            InsnDesc1,
+            #[name = "ONUAYC+CMSSI9", size = 8.966]
+            InsnDesc2,
+            #[name = "TNGBFZ+CMSY9", size = 8.966]
+            InsnDesc3,
+            #[name = "WHMZPU+CMEX9", size = 8.966]
+            InsnDesc4,
+            #[name = "ZJTMSG+CMSS9", size = 8.966]
+            InsnDesc5,
+        },
+        #[group]
+        InsnDescMisc {
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 2.377]
+            InsnDescMisc0,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 2.561]
+            InsnDescMisc1,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 4.492]
+            InsnDescMisc2,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 4.641]
+            InsnDescMisc3,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 4.772]
+            InsnDescMisc4,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 4.864]
+            InsnDescMisc5,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 4.925]
+            InsnDescMisc6,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 5.097]
+            InsnDescMisc7,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 5.123]
+            InsnDescMisc8,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 5.131]
+            InsnDescMisc9,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 5.516]
+            InsnDescMisc10,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 5.604]
+            InsnDescMisc11,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 5.634]
+            InsnDescMisc12,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 5.906]
+            InsnDescMisc13,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 6.033]
+            InsnDescMisc14,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 6.068]
+            InsnDescMisc15,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 6.213]
+            InsnDescMisc16,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 6.252]
+            InsnDescMisc17,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 6.962]
+            InsnDescMisc18,
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 7.977]
+            InsnDescMisc19,
+        },
+        #[group]
+        InsnDescCode {
+            #[name = "APUYSQ+zcoN-Regular", size = 6.974]
+            InsnDescCode,
+        },
+        #[group]
+        InsnDescCodeMisc {
+            #[name = "APUYSQ+zcoN-Regular", size = 3.587]
+            InsnDescCodeMisc0,
+            #[name = "APUYSQ+zcoN-Regular", size = 4.483]
+            InsnDescCodeMisc1,
+        },
+        #[group]
+        InsnDescItalic {
+            #[name = "CGMSHV+DejaVuSansCondensed-Oblique", size = 8.966]
+            InsnDescItalic,
+        },
+        #[group]
+        InsnDescBold {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 8.966]
+            InsnDescBold,
+        },
+        #[group]
+        InsnDescBoldItalic {
+            #[name = "YDJYQV+DejaVuSansCondensed-BoldOblique", size = 8.966]
+            InsnDescBoldItalic,
+        },
+        #[group]
+        InsnDescSmall {
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 7.97]
+            InsnDescSmall,
+        },
+        #[group]
+        InsnDescSmallItalic {
+            #[name = "CGMSHV+DejaVuSansCondensed-Oblique", size = 7.97]
+            InsnDescSmallItalic,
+        },
+        #[group]
+        InsnDescSmallBold {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 7.97]
+            InsnDescSmallBold,
+        },
+        #[group]
+        InsnDescSmallBoldItalic {
+            #[name = "YDJYQV+DejaVuSansCondensed-BoldOblique", size = 7.97]
+            InsnDescSmallBoldItalic,
+        },
+        #[group]
+        InsnDescBoldMisc {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 2.21]
+            InsnDescBoldMisc0,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 2.399]
+            InsnDescBoldMisc1,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 2.763]
+            InsnDescBoldMisc2,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 2.946]
+            InsnDescBoldMisc3,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 2.949]
+            InsnDescBoldMisc4,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 2.999]
+            InsnDescBoldMisc5,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.065]
+            InsnDescBoldMisc6,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.086]
+            InsnDescBoldMisc7,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.183]
+            InsnDescBoldMisc8,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.686]
+            InsnDescBoldMisc9,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.744]
+            InsnDescBoldMisc10,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.825]
+            InsnDescBoldMisc11,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.842]
+            InsnDescBoldMisc12,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.857]
+            InsnDescBoldMisc13,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 3.979]
+            InsnDescBoldMisc14,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.032]
+            InsnDescBoldMisc15,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.112]
+            InsnDescBoldMisc16,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.161]
+            InsnDescBoldMisc17,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.206]
+            InsnDescBoldMisc18,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.353]
+            InsnDescBoldMisc19,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.378]
+            InsnDescBoldMisc20,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.434]
+            InsnDescBoldMisc21,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.595]
+            InsnDescBoldMisc22,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.619]
+            InsnDescBoldMisc23,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.647]
+            InsnDescBoldMisc24,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.68]
+            InsnDescBoldMisc25,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.693]
+            InsnDescBoldMisc26,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.736]
+            InsnDescBoldMisc27,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.781]
+            InsnDescBoldMisc28,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.802]
+            InsnDescBoldMisc29,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 4.995]
+            InsnDescBoldMisc30,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.201]
+            InsnDescBoldMisc31,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.258]
+            InsnDescBoldMisc32,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.363]
+            InsnDescBoldMisc33,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.442]
+            InsnDescBoldMisc34,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.473]
+            InsnDescBoldMisc35,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.485]
+            InsnDescBoldMisc36,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.512]
+            InsnDescBoldMisc37,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.543]
+            InsnDescBoldMisc38,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.613]
+            InsnDescBoldMisc39,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.744]
+            InsnDescBoldMisc40,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.774]
+            InsnDescBoldMisc41,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.809]
+            InsnDescBoldMisc42,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.849]
+            InsnDescBoldMisc43,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.911]
+            InsnDescBoldMisc44,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.92]
+            InsnDescBoldMisc45,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.962]
+            InsnDescBoldMisc46,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.981]
+            InsnDescBoldMisc47,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.146]
+            InsnDescBoldMisc48,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.213]
+            InsnDescBoldMisc49,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.221]
+            InsnDescBoldMisc50,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.243]
+            InsnDescBoldMisc51,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.55]
+            InsnDescBoldMisc52,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.62]
+            InsnDescBoldMisc53,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.699]
+            InsnDescBoldMisc54,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.725]
+            InsnDescBoldMisc55,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.751]
+            InsnDescBoldMisc56,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.856]
+            InsnDescBoldMisc57,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 8.029]
+            InsnDescBoldMisc58,
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 8.406]
+            InsnDescBoldMisc59,
+        },
+        #[group]
+        InsnDescSubscript {
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 5.978]
+            InsnDescSubscript,
+        },
+        #[group]
+        InsnDescBoldSubscript {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 5.978]
+            InsnDescBoldSubscript,
+        },
+        #[group]
+        InsnDescItalicSubscript {
+            #[name = "CGMSHV+DejaVuSansCondensed-Oblique", size = 5.978]
+            InsnDescItalicSubscript,
+        },
+        #[group]
+        InsnDescBoldItalicSubscript {
+            #[name = "YDJYQV+DejaVuSansCondensed-BoldOblique", size = 5.978]
+            InsnDescBoldItalicSubscript,
+        },
+        #[group]
+        InsnExtMnemonic {
+            #[name = "APUYSQ+zcoN-Regular", size = 8.966]
+            InsnExtMnemonic,
+        },
+        #[group]
+        InsnCode {
+            #[name = "APUYSQ+zcoN-Regular", size = 7.97]
+            InsnCode0,
+            #[name = "RRFUNA+CMSY8", size = 7.97]
+            InsnCode1,
+            #[name = "HPXOZC+CMSS8", size = 7.97]
+            InsnCode2,
+        },
+        #[group]
+        InsnCodeSubscript {
+            #[name = "APUYSQ+zcoN-Regular", size = 5.978]
+            InsnCodeSubscript0,
+            #[name = "DBQTKF+CMSY6", size = 5.978]
+            InsnCodeSubscript1,
+        },
+        #[group]
+        TitlePageBig {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 24.787]
+            TitlePageBig,
+        },
+        #[group]
+        TitlePageVersion {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 9.963]
+            TitlePageVersion,
+        },
+        #[group]
+        TitlePageTm {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 6.974]
+            TitlePageTm,
+        },
+        #[group]
+        TitlePageRev {
+            #[name = "MJBFWM+DejaVuSansCondensed", size = 6.974]
+            TitlePageRev,
+        },
+        #[group]
+        TitlePageBook {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 20.663]
+            TitlePageBook,
+        },
+        #[group]
+        LegalPageItalic {
+            #[name = "CGMSHV+DejaVuSansCondensed-Oblique", size = 9.963]
+            LegalPageItalic,
+        },
+        #[group]
+        ChangeSummaryPageBold {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 11.955]
+            ChangeSummaryPageBold,
+        },
+        #[group]
+        ChapterTitle {
+            #[name = "NHUPPK+DejaVuSansCondensed-Bold", size = 17.215]
+            ChapterTitle,
+        },
+        #[group]
+        MathMisc {
+            #[name = "AAJMKT+CMMI6", size = 5.978]
+            MathMisc0,
+            #[name = "CUTMFD+CMSSI8", size = 5.978]
+            MathMisc1,
+            #[name = "CUTMFD+CMSSI8", size = 7.97]
+            MathMisc2,
+            #[name = "FZTIYT+CMMI9", size = 5.734]
+            MathMisc3,
+            #[name = "FZTIYT+CMMI9", size = 7.168]
+            MathMisc4,
+            #[name = "HONFQS+CMMI8", size = 7.97]
+            MathMisc5,
+            #[name = "HPXOZC+CMSS8", size = 5.978]
+            MathMisc6,
+            #[name = "LLVRDD+CMSY10", size = 11.955]
+            MathMisc7,
+            #[name = "ZJTMSG+CMSS9", size = 7.168]
+            MathMisc8,
+        },
+    }
+}
+
+impl Font {
+    const fn space_width(&self) -> f32 {
+        self.size() * const { 3.985 / Font::InsnCode0.size() }
+    }
+    const fn line_height_helper(&self) -> f32 {
+        const fn str_eq(a: &str, b: &str) -> bool {
+            let a = a.as_bytes();
+            let b = b.as_bytes();
+            if a.len() != b.len() {
+                return false;
+            }
+            let mut i = 0;
+            while i < a.len() {
+                if a[i] != b[i] {
+                    return false;
+                }
+                i += 1;
+            }
+            true
+        }
+        let font_name = self.font_name();
+        let mut i = 0;
+        while i < KnownFontGroup::INSN_CODE_FONT_GROUPS.len() {
+            let fonts = KnownFontGroup::INSN_CODE_FONT_GROUPS[i].fonts();
+            let mut j = 0;
+            while j < fonts.len() {
+                if str_eq(font_name, fonts[j].font_name()) {
+                    return 9.464 * self.size() / Font::InsnCode0.size();
+                }
+                j += 1;
+            }
+            i += 1;
+        }
+        let group = self.known_font_group();
+        if matches!(group, Some(KnownFontGroup::InsnDesc))
+            || str_eq(font_name, Font::InsnDesc0.font_name())
+            || str_eq(font_name, Font::InsnDescBold.font_name())
+            || str_eq(font_name, Font::InsnDescItalic.font_name())
+            || str_eq(font_name, Font::InsnDescBoldItalic.font_name())
+            || matches!(group, Some(KnownFontGroup::MathMisc))
+        {
+            return 10.959 * self.size() / Font::InsnDesc0.size();
+        }
+        panic!("no line height")
+    }
+}
+
 fn main() {}