import utif, { TiffTag } from "utif2";
import { Bitmap, Format } from "@jimp/types";
function getDimensionValue(dimension: number | Uint8Array | TiffTag) {
if (typeof dimension === "number") {
return dimension;
}
if (dimension instanceof Uint8Array) {
return dimension[0];
}
if (typeof dimension[0] === "string") {
return parseInt(dimension[0]);
}
return dimension[0];
}
export default function tiff() {
return {
mime: "image/tiff",
encode: (bitmap) => {
const tiff = utif.encodeImage(bitmap.data, bitmap.width, bitmap.height);
return Buffer.from(tiff);
},
decode: (data) => {
const ifds = utif.decode(data);
const page = ifds[0];
if (!page) {
throw new Error("No page found in TIFF");
}
if (!page.t256) {
throw new Error("No image width found in TIFF");
}
if (!page.t257) {
throw new Error("No image height found in TIFF");
}
ifds.forEach((ifd) => {
utif.decodeImage(data, ifd);
});
const rgba = utif.toRGBA8(page);
return {
data: Buffer.from(rgba),
width: getDimensionValue(page.t256),
height: getDimensionValue(page.t257),
} as Bitmap;
},
} satisfies Format<"image/tiff">;
}
