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import { readJson } from "fs-extra";
import {
ImageIndexFunction,
IndexedImage,
indexedImageTo2bppTileData,
sliceIndexedImage,
trimIndexedImageHorizontal,
} from "shared/lib/tiles/indexedImage";
import { readFileToIndexedImage } from "lib/tiles/readFileToTiles";
export interface CompiledFontData {
name: string;
table: number[];
widths: number[];
data: Uint8Array;
isVariableWidth: boolean;
is1Bit: boolean;
mapping: Record<string, number>;
}
interface CharacterData {
width: number;
data: IndexedImage;
}
type CharLookup = Record<string, CharacterData>;
enum Color {
White = 0,
Light = 1,
Mid = 2,
Dark = 3,
Transparent = 255,
}
const TILE_SIZE = 8;
const FIRST_CHAR = 32;
export const readFileToFontData = async (
filename: string,
): Promise<CompiledFontData> => {
const name = Path.basename(filename);
const image = await readFileToIndexedImage(filename, fontDataIndexFn);
const tileWidth = Math.floor(image.width / TILE_SIZE);
const tileHeight = Math.floor(image.height / TILE_SIZE);
const chars: CharacterData[] = [];
let is1Bit = true;
let isVariableWidth = false;
const metadataFilename = filename.replace(/\.png$/i, ".json");
let mapping: Record<string, number> = {};
let tableMapping: Record<string, number> = {};
try {
const metadataFile = await readJson(metadataFilename);
Eif (typeof metadataFile === "object") {
Eif (metadataFile.mapping && typeof metadataFile.mapping === "object") {
mapping = metadataFile.mapping;
}
Iif (metadataFile.table && typeof metadataFile.table === "object") {
tableMapping = metadataFile.table;
}
}
} catch {}
// Determine if font is only using white & black pixels
for (let i = 0; i < image.data.length; i++) {
Iif (image.data[i] === Color.Light || image.data[i] === Color.Mid) {
is1Bit = false;
break;
}
}
// Build tile list
for (let ty = 0; ty < tileHeight; ty++) {
for (let tx = 0; tx < tileWidth; tx++) {
const tile = sliceIndexedImage(
image,
tx * TILE_SIZE,
ty * TILE_SIZE,
TILE_SIZE,
TILE_SIZE,
);
const trimmedTile = trimIndexedImageHorizontal(tile, Color.Transparent);
if (trimmedTile.data.width < TILE_SIZE) {
isVariableWidth = true;
}
chars.push({
width: trimmedTile.data.width,
data: sliceIndexedImage(trimmedTile.data, 0, 0, TILE_SIZE, TILE_SIZE),
});
}
}
// Build unique tiles list
const uniqueTilesLookup: CharLookup = {};
const charKeys: string[] = [];
for (const char of chars) {
const key = hashChar(char.data, char.width);
if (!uniqueTilesLookup[key]) {
uniqueTilesLookup[key] = char;
}
charKeys.push(key);
}
const uniqueTileKeys = Object.keys(uniqueTilesLookup);
const uniqueTiles = Object.values(uniqueTilesLookup);
// Construct output data
let table = (
tileHeight < 16 ? (Array.from(Array(FIRST_CHAR)) as number[]).fill(0) : []
).concat(charKeys.map((key) => uniqueTileKeys.indexOf(key)));
Iif (Object.keys(tableMapping).length) {
//get highest mapped char
const mappingKeys = Object.keys(tableMapping)
.map((mappingKey) => {
return mappingKey.charCodeAt(0);
})
.filter((charcode) => {
return charcode < 256;
});
const maxValue = Math.max(...mappingKeys) + 1;
//adjust the table size to fit tableMapping
if (table.length < maxValue) {
table = table.concat(
(Array.from(Array(maxValue - table.length)) as number[]).fill(0),
);
}
//modify the table with the tableMapping
Object.entries(tableMapping).forEach(([key, value]) => {
const tableIndex = key.charCodeAt(0); //get ascii value of mapped char
if (tableIndex < 256) {
table[tableIndex] = value; //assign mapped value to table
}
});
}
const widths = uniqueTiles.map((tile) => tile.width);
const data = charLookupToTileData(uniqueTilesLookup);
return {
name,
table,
widths,
data,
isVariableWidth,
is1Bit,
mapping,
};
};
const fontDataIndexFn: ImageIndexFunction = (r, g, b, _a) => {
if (g > 249 || (r > 249 && b > 249)) {
return Color.Transparent;
}
if (g < 65) {
return Color.Dark;
}
Iif (g < 130) {
return Color.Mid;
}
Iif (g < 205) {
return Color.Light;
}
return Color.White;
};
const charLookupToTileData = (lookup: CharLookup): Uint8Array => {
const chars = Object.values(lookup);
const charsData = chars.map((char) => indexedImageTo2bppTileData(char.data));
const size = charsData.reduce((memo, char) => memo + char.length, 0);
const output = new Uint8Array(size);
let index = 0;
for (const charData of charsData) {
output.set(charData, index);
index += charData.length;
}
return output;
};
const hashChar = (char: IndexedImage, width: number): string => {
// Will do for now...
return `${width}_${JSON.stringify(char.data)}`;
};
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