converter.ts•3.41 kB
import sharp from "sharp";
import { JSDOM } from "jsdom";
import fs from "fs-extra";
interface ConversionResult {
width: number;
height: number;
size: number;
}
/**
* Extract dimensions from SVG code
*/
function extractSvgDimensions(svgCode: string): { width: number; height: number } {
// Create a DOM parser
const dom = new JSDOM(`<!DOCTYPE html><body>${svgCode}</body>`);
const svg = dom.window.document.querySelector("svg");
if (!svg) {
throw new Error("Invalid SVG: No SVG element found");
}
// Try to get dimensions from viewBox first
let width = 0;
let height = 0;
const viewBox = svg.getAttribute("viewBox");
if (viewBox) {
const [, , w, h] = viewBox.split(/\s+/).map(parseFloat);
width = w;
height = h;
}
// If viewBox doesn't exist or is invalid, try width/height attributes
if (!width || !height) {
const widthAttr = svg.getAttribute("width");
const heightAttr = svg.getAttribute("height");
if (widthAttr) {
width = parseFloat(widthAttr);
}
if (heightAttr) {
height = parseFloat(heightAttr);
}
}
// Default dimensions if nothing is specified
if (!width || !height) {
width = 300;
height = 150;
}
return { width, height };
}
/**
* Convert SVG to PNG
*/
export async function convertSvgToPng(
svgCode: string,
outputPath: string,
backgroundColor?: string,
scale = 1
): Promise<ConversionResult> {
// Extract dimensions
const { width, height } = extractSvgDimensions(svgCode);
// Calculate scaled dimensions
const scaledWidth = Math.round(width * scale);
const scaledHeight = Math.round(height * scale);
// Convert using Sharp
const buffer = Buffer.from(svgCode);
const sharpInstance = sharp(buffer, { density: 96 * scale });
if (backgroundColor) {
sharpInstance.flatten({ background: backgroundColor });
}
// Apply dimensions
sharpInstance.resize({
width: scaledWidth,
height: scaledHeight,
fit: 'contain',
background: { r: 0, g: 0, b: 0, alpha: 0 }
});
// Save to file
await sharpInstance.png().toFile(outputPath);
// Get file size
const stats = await fs.stat(outputPath);
return {
width: scaledWidth,
height: scaledHeight,
size: stats.size
};
}
/**
* Convert SVG to JPG
*/
export async function convertSvgToJpg(
svgCode: string,
outputPath: string,
backgroundColor = "#ffffff",
quality = 90,
scale = 1
): Promise<ConversionResult> {
// Extract dimensions
const { width, height } = extractSvgDimensions(svgCode);
// Calculate scaled dimensions
const scaledWidth = Math.round(width * scale);
const scaledHeight = Math.round(height * scale);
// Convert using Sharp
const buffer = Buffer.from(svgCode);
const sharpInstance = sharp(buffer, { density: 96 * scale });
// JPGs don't support transparency, so we need a background
sharpInstance.flatten({ background: backgroundColor || "#ffffff" });
// Apply dimensions
sharpInstance.resize({
width: scaledWidth,
height: scaledHeight,
fit: 'contain',
background: backgroundColor || "#ffffff"
});
// Save to file
await sharpInstance.jpeg({ quality: quality || 90 }).toFile(outputPath);
// Get file size
const stats = await fs.stat(outputPath);
return {
width: scaledWidth,
height: scaledHeight,
size: stats.size
};
}