108 lines
2.6 KiB
TypeScript
108 lines
2.6 KiB
TypeScript
import * as sharp from 'sharp';
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export type IImage = {
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data: Buffer;
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ext: string | null;
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type: string;
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};
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/**
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* Convert to JPEG
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* with resize, remove metadata, resolve orientation, stop animation
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*/
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export async function convertToJpeg(path: string, width: number, height: number): Promise<IImage> {
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return convertSharpToJpeg(await sharp(path), width, height);
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}
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export async function convertSharpToJpeg(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
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const data = await sharp
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.resize(width, height, {
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fit: 'inside',
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withoutEnlargement: true
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})
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.rotate()
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.jpeg({
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quality: 85,
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progressive: true
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})
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.toBuffer();
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return {
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data,
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ext: 'jpg',
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type: 'image/jpeg'
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};
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}
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/**
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* Convert to WebP
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* with resize, remove metadata, resolve orientation, stop animation
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*/
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export async function convertToWebp(path: string, width: number, height: number): Promise<IImage> {
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return convertSharpToWebp(await sharp(path), width, height);
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}
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export async function convertSharpToWebp(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
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const data = await sharp
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.resize(width, height, {
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fit: 'inside',
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withoutEnlargement: true
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})
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.rotate()
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.webp({
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quality: 85
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})
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.toBuffer();
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return {
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data,
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ext: 'webp',
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type: 'image/webp'
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};
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}
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/**
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* Convert to PNG
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* with resize, remove metadata, resolve orientation, stop animation
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*/
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export async function convertToPng(path: string, width: number, height: number): Promise<IImage> {
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return convertSharpToPng(await sharp(path), width, height);
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}
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export async function convertSharpToPng(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
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const data = await sharp
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.resize(width, height, {
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fit: 'inside',
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withoutEnlargement: true
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})
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.rotate()
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.png()
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.toBuffer();
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return {
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data,
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ext: 'png',
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type: 'image/png'
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};
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}
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/**
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* Convert to PNG or JPEG
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* with resize, remove metadata, resolve orientation, stop animation
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*/
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export async function convertToPngOrJpeg(path: string, width: number, height: number): Promise<IImage> {
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return convertSharpToPngOrJpeg(await sharp(path), width, height);
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}
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export async function convertSharpToPngOrJpeg(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
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const stats = await sharp.stats();
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const metadata = await sharp.metadata();
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// 不透明で300x300pxの範囲を超えていればJPEG
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if (stats.isOpaque && ((metadata.width && metadata.width >= 300) || (metadata.height && metadata!.height >= 300))) {
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return await convertSharpToJpeg(sharp, width, height);
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} else {
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return await convertSharpToPng(sharp, width, height);
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}
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}
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