1 files changed, 150 insertions, 0 deletions
diff --git a/packages/excalidraw/fonts/FontMetadata.ts b/packages/excalidraw/fonts/FontMetadata.ts
new file mode 100644
index 0000000..e93380e
--- /dev/null
+++ b/packages/excalidraw/fonts/FontMetadata.ts
@@ -0,0 +1,150 @@
+import type { JSX } from "react";
+import {
+  FreedrawIcon,
+  FontFamilyNormalIcon,
+  FontFamilyHeadingIcon,
+  FontFamilyCodeIcon,
+} from "../components/icons";
+import { FONT_FAMILY, FONT_FAMILY_FALLBACKS } from "../constants";
+
+/**
+ * Encapsulates font metrics with additional font metadata.
+ * */
+export interface FontMetadata {
+  /** for head & hhea metrics read the woff2 with https://fontdrop.info/ */
+  metrics: {
+    /** head.unitsPerEm metric */
+    unitsPerEm: 1000 | 1024 | 2048;
+    /** hhea.ascender metric */
+    ascender: number;
+    /** hhea.descender metric */
+    descender: number;
+    /** harcoded unitless line-height, https://github.com/excalidraw/excalidraw/pull/6360#issuecomment-1477635971 */
+    lineHeight: number;
+  };
+  /** element to be displayed as an icon  */
+  icon?: JSX.Element;
+  /** flag to indicate a deprecated font */
+  deprecated?: true;
+  /** flag to indicate a server-side only font */
+  serverSide?: true;
+  /** flag to indiccate a local-only font */
+  local?: true;
+  /** flag to indicate a fallback font */
+  fallback?: true;
+}
+
+export const FONT_METADATA: Record<number, FontMetadata> = {
+  [FONT_FAMILY.Excalifont]: {
+    metrics: {
+      unitsPerEm: 1000,
+      ascender: 886,
+      descender: -374,
+      lineHeight: 1.25,
+    },
+    icon: FreedrawIcon,
+  },
+  [FONT_FAMILY.Nunito]: {
+    metrics: {
+      unitsPerEm: 1000,
+      ascender: 1011,
+      descender: -353,
+      lineHeight: 1.35,
+    },
+    icon: FontFamilyNormalIcon,
+  },
+  [FONT_FAMILY["Lilita One"]]: {
+    metrics: {
+      unitsPerEm: 1000,
+      ascender: 923,
+      descender: -220,
+      lineHeight: 1.15,
+    },
+    icon: FontFamilyHeadingIcon,
+  },
+  [FONT_FAMILY["Comic Shanns"]]: {
+    metrics: {
+      unitsPerEm: 1000,
+      ascender: 750,
+      descender: -250,
+      lineHeight: 1.25,
+    },
+    icon: FontFamilyCodeIcon,
+  },
+  [FONT_FAMILY.Virgil]: {
+    metrics: {
+      unitsPerEm: 1000,
+      ascender: 886,
+      descender: -374,
+      lineHeight: 1.25,
+    },
+    icon: FreedrawIcon,
+    deprecated: true,
+  },
+  [FONT_FAMILY.Helvetica]: {
+    metrics: {
+      unitsPerEm: 2048,
+      ascender: 1577,
+      descender: -471,
+      lineHeight: 1.15,
+    },
+    icon: FontFamilyNormalIcon,
+    deprecated: true,
+    local: true,
+  },
+  [FONT_FAMILY.Cascadia]: {
+    metrics: {
+      unitsPerEm: 2048,
+      ascender: 1900,
+      descender: -480,
+      lineHeight: 1.2,
+    },
+    icon: FontFamilyCodeIcon,
+    deprecated: true,
+  },
+  [FONT_FAMILY["Liberation Sans"]]: {
+    metrics: {
+      unitsPerEm: 2048,
+      ascender: 1854,
+      descender: -434,
+      lineHeight: 1.15,
+    },
+    serverSide: true,
+  },
+  [FONT_FAMILY_FALLBACKS.Xiaolai]: {
+    metrics: {
+      unitsPerEm: 1000,
+      ascender: 880,
+      descender: -144,
+      lineHeight: 1.15,
+    },
+    fallback: true,
+  },
+  [FONT_FAMILY_FALLBACKS["Segoe UI Emoji"]]: {
+    metrics: {
+      // reusing Excalifont metrics
+      unitsPerEm: 1000,
+      ascender: 886,
+      descender: -374,
+      lineHeight: 1.25,
+    },
+    local: true,
+    fallback: true,
+  },
+};
+
+/** Unicode ranges defined by google fonts */
+export const GOOGLE_FONTS_RANGES = {
+  LATIN:
+    "U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD",
+  LATIN_EXT:
+    "U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF",
+  CYRILIC_EXT:
+    "U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F",
+  CYRILIC: "U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116",
+  VIETNAMESE:
+    "U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB",
+};
+
+/** local protocol to skip the local font from registering or inlining */
+export const LOCAL_FONT_PROTOCOL = "local:";