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Extend ExportShapeTool to support the export of image fill content

Browse Source 
Add new tool parameter `mode` ("shape" or "fill") to support this

Since the fill's format is not guaranteed to be PNG, include dependency
`sharp` to handle image format conversion

Because the export logic has become more complex, introduce
PenpotUtils.exportImage utility function for minimal code to be
sent to the plugin for execution

Resolves #12
This commit is contained in:
Dominik Jain 2026-01-13 21:19:39 +01:00
parent ec798e0363
commit 3dc2411130
5 changed files with 645 additions and 14 deletions
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548
mcp-server/package-lock.json generated
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@ -19,6 +19,7 @@
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"optionalDependencies": {
"@img/sharp-darwin-arm64": "0.34.5",
"@img/sharp-darwin-x64": "0.34.5",
"@img/sharp-libvips-darwin-arm64": "1.2.4",
"@img/sharp-libvips-darwin-x64": "1.2.4",
"@img/sharp-libvips-linux-arm": "1.2.4",
"@img/sharp-libvips-linux-arm64": "1.2.4",
"@img/sharp-libvips-linux-ppc64": "1.2.4",
"@img/sharp-libvips-linux-riscv64": "1.2.4",
"@img/sharp-libvips-linux-s390x": "1.2.4",
"@img/sharp-libvips-linux-x64": "1.2.4",
"@img/sharp-libvips-linuxmusl-arm64": "1.2.4",
"@img/sharp-libvips-linuxmusl-x64": "1.2.4",
"@img/sharp-linux-arm": "0.34.5",
"@img/sharp-linux-arm64": "0.34.5",
"@img/sharp-linux-ppc64": "0.34.5",
"@img/sharp-linux-riscv64": "0.34.5",
"@img/sharp-linux-s390x": "0.34.5",
"@img/sharp-linux-x64": "0.34.5",
"@img/sharp-linuxmusl-arm64": "0.34.5",
"@img/sharp-linuxmusl-x64": "0.34.5",
"@img/sharp-wasm32": "0.34.5",
"@img/sharp-win32-arm64": "0.34.5",
"@img/sharp-win32-ia32": "0.34.5",
"@img/sharp-win32-x64": "0.34.5"
}
},
"node_modules/shebang-command": {
"version": "2.0.0",
"license": "MIT",
@ -2334,6 +2875,13 @@
}
}
},
"node_modules/tslib": {
"version": "2.8.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
"integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
"license": "0BSD",
"optional": true
},
"node_modules/type-is": {
"version": "2.0.1",
"resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",

3
mcp-server/package.json
View File

@ -5,7 +5,7 @@
"type": "module",
"main": "dist/index.js",
"scripts": {
"build": "esbuild src/index.ts --bundle --platform=node --target=node18 --format=esm --outfile=dist/index.js --external:@modelcontextprotocol/* --external:ws --external:express --external:class-transformer --external:class-validator --external:reflect-metadata --external:pino --external:pino-pretty --external:js-yaml && npm run copy-static",
"build": "esbuild src/index.ts --bundle --platform=node --target=node18 --format=esm --outfile=dist/index.js --external:@modelcontextprotocol/* --external:ws --external:express --external:class-transformer --external:class-validator --external:reflect-metadata --external:pino --external:pino-pretty --external:js-yaml --external:sharp && npm run copy-static",
"copy-static": "node -e \"require('fs').cpSync('src/static', 'dist/static', { recursive: true })\"",
"build:types": "tsc --emitDeclarationOnly --outDir dist",
"build:full": "npm run build && npm run build:types",
@ -32,6 +32,7 @@
"pino": "^9.10.0",
"pino-pretty": "^13.1.1",
"reflect-metadata": "^0.1.13",
"sharp": "^0.34.5",
"ws": "^8.18.0"
},
"devDependencies": {

9
mcp-server/src/ToolResponse.ts
View File

@ -22,7 +22,7 @@ export class TextContent implements TextItem {
}
}
class ImageContent implements ImageItem {
export class ImageContent implements ImageItem {
[x: string]: unknown;
readonly type = "image" as const;
@ -36,7 +36,12 @@ class ImageContent implements ImageItem {
) {}
/**
* @param data - PNG image data as Uint8Array or as object (from JSON conversion of Uint8Array)
* Utility function for ensuring a consistent Uint8Array representation of byte data.
* Input can be either a Uint8Array or an object (as obtained from JSON conversion of Uint8Array
* from the plugin).
*
* @param data - data as Uint8Array or as object (from JSON conversion of Uint8Array)
* @return data as Uint8Array
*/
public static byteData(data: Uint8Array | object): Uint8Array {
if (typeof data === "object") {

56
mcp-server/src/tools/ExportShapeTool.ts
View File

@ -1,10 +1,11 @@
import { z } from "zod";
import { Tool } from "../Tool";
import { PNGImageContent, PNGResponse, TextContent, TextResponse, ToolResponse } from "../ToolResponse";
import { ImageContent, PNGImageContent, PNGResponse, TextContent, TextResponse, ToolResponse } from "../ToolResponse";
import "reflect-metadata";
import { PenpotMcpServer } from "../PenpotMcpServer";
import { ExecuteCodePluginTask } from "../tasks/ExecuteCodePluginTask";
import { FileUtils } from "../utils/FileUtils";
import sharp from "sharp";
/**
* Arguments class for ExportShapeTool
@ -18,7 +19,14 @@ export class ExportShapeArgs {
"Identifier of the shape to export. Use the special identifier 'selection' to " +
"export the first shape currently selected by the user."
),
format: z.enum(["svg", "png"]).default("png").describe("The output format, either PNG (default) or SVG."),
format: z.enum(["svg", "png"]).default("png").describe("The output format, either 'png' (default) or 'svg'."),
mode: z
.enum(["shape", "fill"])
.default("shape")
.describe(
"The export mode: either 'shape' (full shape as it appears in the design, including descendants; the default) or " +
"'fill' (export the raw image that is used as a fill for the shape; PNG format only)"
),
filePath: z
.string()
.optional()
@ -32,6 +40,8 @@ export class ExportShapeArgs {
format: "svg" | "png" = "png";
mode: "shape" | "fill" = "shape";
filePath?: string;
}
@ -60,9 +70,11 @@ export class ExportShapeTool extends Tool<ExportShapeArgs> {
public getToolDescription(): string {
let description =
"Exports a shape from the Penpot design to a PNG or SVG image, " +
"such that you can get an impression of what the shape looks like.";
if (this.mcpServer.isFileSystemAccessEnabled()) description += "\nAlternatively, you can save it to a file.";
"Exports a shape (or a shape's image fill) from the Penpot design to a PNG or SVG image, " +
"such that you can get an impression of what it looks like. ";
if (this.mcpServer.isFileSystemAccessEnabled()) {
description += "\nAlternatively, you can save it to a file.";
}
return description;
}
@ -79,7 +91,8 @@ export class ExportShapeTool extends Tool<ExportShapeArgs> {
} else {
shapeCode = `penpotUtils.findShapeById("${args.shapeId}")`;
}
const code = `return ${shapeCode}.export({"type": "${args.format}"});`;
const asSvg = args.format === "svg";
const code = `return penpotUtils.exportImage(${shapeCode}, "${args.mode}", ${asSvg});`;
// execute the code and obtain the image data
const task = new ExecuteCodePluginTask({ code: code });
@ -90,22 +103,45 @@ export class ExportShapeTool extends Tool<ExportShapeArgs> {
if (!args.filePath) {
// return image data directly (for the LLM to "see" it)
if (args.format === "png") {
return new PNGResponse(imageData);
return new PNGResponse(await this.toPngImageBytes(imageData));
} else {
return TextResponse.fromData(imageData);
}
} else {
// make sure file system access is enabled
// save to file requested: make sure file system access is enabled
if (!this.mcpServer.isFileSystemAccessEnabled()) {
throw new Error("File system access is not enabled on the MCP server!");
}
// save image to file
// save to file
if (args.format === "png") {
FileUtils.writeBinaryFile(args.filePath, PNGImageContent.byteData(imageData));
FileUtils.writeBinaryFile(args.filePath, await this.toPngImageBytes(imageData));
} else {
FileUtils.writeTextFile(args.filePath, TextContent.textData(imageData));
}
return new TextResponse(`The shape has been exported to ${args.filePath}`);
}
}
/**
* Converts image data to PNG format if necessary.
*
* @param data - The original image data as Uint8Array or as object (from JSON conversion of Uint8Array)
* @return The image data as PNG bytes
*/
private async toPngImageBytes(data: Uint8Array | object): Promise<Uint8Array> {
const originalBytes = ImageContent.byteData(data);
// use sharp to detect format and convert to PNG if necessary
const image = sharp(originalBytes);
const metadata = await image.metadata();
// if already PNG, return as-is to avoid unnecessary re-encoding
if (metadata.format === "png") {
return originalBytes;
}
// convert to PNG
const pngBuffer = await image.png().toBuffer();
return new Uint8Array(pngBuffer);
}
}

43
penpot-plugin/src/PenpotUtils.ts
View File

@ -1,4 +1,4 @@
import { Page, Rectangle, Shape } from "@penpot/plugin-types";
import { Fill, Page, Rectangle, Shape } from "@penpot/plugin-types";
export class PenpotUtils {
/**
@ -252,4 +252,45 @@ export class PenpotUtils {
return rect;
}
/**
* Exports the given shape (or its fill) to BASE64 image data.
*
* This function is used internally by the ExportImageTool in the MCP server.
*
* @param shape - The shape whose image data to export
* @param mode - Either "shape" (to export the entire shape, including descendants) or "fill"
* to export the shape's raw fill image data
* @param asSVG - Whether to export as SVG rather than as a pixel image (only supported for mode "shape")
* @returns A byte array containing the exported image data.
* - For mode="shape", it will be PNG or SVG data depending on the value of `asSVG`.
* - For mode="fill", it will be whatever format the fill image is stored in.
*/
public static async exportImage(shape: Shape, mode: "shape" | "fill", asSVG: boolean): Promise<Uint8Array> {
switch (mode) {
case "shape":
return shape.export({ type: asSVG ? "svg" : "png" });
case "fill":
if (asSVG) {
throw new Error("Image fills cannot be exported as SVG");
}
// check whether the shape has the `fills` member
if (!("fills" in shape)) {
throw new Error("Shape with `fills` member is required for fill export mode");
}
// find first fill that has fillImage
const fills: Fill[] = (shape as any).fills;
for (const fill of fills) {
if (fill.fillImage) {
const imageData = fill.fillImage;
// TODO: fix ts-ignore once Penpot types are updated to include data() method
// @ts-ignore
return imageData.data();
}
}
throw new Error("No fill with image data found in the shape");
default:
throw new Error(`Unsupported export mode: ${mode}`);
}
}
}