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import {
exportToCanvas as _exportToCanvas,
exportToSvg as _exportToSvg,
} from "@excalidraw/excalidraw/scene/export";
import { getDefaultAppState } from "@excalidraw/excalidraw/appState";
import type { AppState, BinaryFiles } from "@excalidraw/excalidraw/types";
import type {
ExcalidrawElement,
ExcalidrawFrameLikeElement,
NonDeleted,
} from "@excalidraw/excalidraw/element/types";
import { restore } from "@excalidraw/excalidraw/data/restore";
import { MIME_TYPES } from "@excalidraw/excalidraw/constants";
import { encodePngMetadata } from "@excalidraw/excalidraw/data/image";
import { serializeAsJSON } from "@excalidraw/excalidraw/data/json";
import {
copyBlobToClipboardAsPng,
copyTextToSystemClipboard,
copyToClipboard,
} from "@excalidraw/excalidraw/clipboard";
export { MIME_TYPES };
type ExportOpts = {
elements: readonly NonDeleted<ExcalidrawElement>[];
appState?: Partial<Omit<AppState, "offsetTop" | "offsetLeft">>;
files: BinaryFiles | null;
maxWidthOrHeight?: number;
exportingFrame?: ExcalidrawFrameLikeElement | null;
getDimensions?: (
width: number,
height: number,
) => { width: number; height: number; scale?: number };
};
export const exportToCanvas = ({
elements,
appState,
files,
maxWidthOrHeight,
getDimensions,
exportPadding,
exportingFrame,
}: ExportOpts & {
exportPadding?: number;
}) => {
const { elements: restoredElements, appState: restoredAppState } = restore(
{ elements, appState },
null,
null,
);
const { exportBackground, viewBackgroundColor } = restoredAppState;
return _exportToCanvas(
restoredElements,
{ ...restoredAppState, offsetTop: 0, offsetLeft: 0, width: 0, height: 0 },
files || {},
{ exportBackground, exportPadding, viewBackgroundColor, exportingFrame },
(width: number, height: number) => {
const canvas = document.createElement("canvas");
if (maxWidthOrHeight) {
if (typeof getDimensions === "function") {
console.warn(
"`getDimensions()` is ignored when `maxWidthOrHeight` is supplied.",
);
}
const max = Math.max(width, height);
// if content is less then maxWidthOrHeight, fallback on supplied scale
const scale =
maxWidthOrHeight < max
? maxWidthOrHeight / max
: appState?.exportScale ?? 1;
canvas.width = width * scale;
canvas.height = height * scale;
return {
canvas,
scale,
};
}
const ret = getDimensions?.(width, height) || { width, height };
canvas.width = ret.width;
canvas.height = ret.height;
return {
canvas,
scale: ret.scale ?? 1,
};
},
);
};
export const exportToBlob = async (
opts: ExportOpts & {
mimeType?: string;
quality?: number;
exportPadding?: number;
},
): Promise<Blob> => {
let { mimeType = MIME_TYPES.png, quality } = opts;
if (mimeType === MIME_TYPES.png && typeof quality === "number") {
console.warn(`"quality" will be ignored for "${MIME_TYPES.png}" mimeType`);
}
// typo in MIME type (should be "jpeg")
if (mimeType === "image/jpg") {
mimeType = MIME_TYPES.jpg;
}
if (mimeType === MIME_TYPES.jpg && !opts.appState?.exportBackground) {
console.warn(
`Defaulting "exportBackground" to "true" for "${MIME_TYPES.jpg}" mimeType`,
);
opts = {
...opts,
appState: { ...opts.appState, exportBackground: true },
};
}
const canvas = await exportToCanvas(opts);
quality = quality ? quality : /image\/jpe?g/.test(mimeType) ? 0.92 : 0.8;
return new Promise((resolve, reject) => {
canvas.toBlob(
async (blob) => {
if (!blob) {
return reject(new Error("couldn't export to blob"));
}
if (
blob &&
mimeType === MIME_TYPES.png &&
opts.appState?.exportEmbedScene
) {
blob = await encodePngMetadata({
blob,
metadata: serializeAsJSON(
// NOTE as long as we're using the Scene hack, we need to ensure
// we pass the original, uncloned elements when serializing
// so that we keep ids stable
opts.elements,
opts.appState,
opts.files || {},
"local",
),
});
}
resolve(blob);
},
mimeType,
quality,
);
});
};
export const exportToSvg = async ({
elements,
appState = getDefaultAppState(),
files = {},
exportPadding,
renderEmbeddables,
exportingFrame,
skipInliningFonts,
reuseImages,
}: Omit<ExportOpts, "getDimensions"> & {
exportPadding?: number;
renderEmbeddables?: boolean;
skipInliningFonts?: true;
reuseImages?: boolean;
}): Promise<SVGSVGElement> => {
const { elements: restoredElements, appState: restoredAppState } = restore(
{ elements, appState },
null,
null,
);
const exportAppState = {
...restoredAppState,
exportPadding,
};
return _exportToSvg(restoredElements, exportAppState, files, {
exportingFrame,
renderEmbeddables,
skipInliningFonts,
reuseImages,
});
};
export const exportToClipboard = async (
opts: ExportOpts & {
mimeType?: string;
quality?: number;
type: "png" | "svg" | "json";
},
) => {
if (opts.type === "svg") {
const svg = await exportToSvg(opts);
await copyTextToSystemClipboard(svg.outerHTML);
} else if (opts.type === "png") {
await copyBlobToClipboardAsPng(exportToBlob(opts));
} else if (opts.type === "json") {
await copyToClipboard(opts.elements, opts.files);
} else {
throw new Error("Invalid export type");
}
};
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