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サムネイルをJPEGで生成するように (#5941)

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MeiMei 2020-02-14 11:40:45 +09:00 • committed by GitHub
parent 962617b4f4
commit 439563c5d6
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3 changed files with 39 additions and 7 deletions
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38
src/services/drive/image-processor.ts
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@ -11,7 +11,11 @@ export type IImage = {
* with resize, remove metadata, resolve orientation, stop animation
*/
export async function convertToJpeg(path: string, width: number, height: number): Promise<IImage> {
const data = await sharp(path)
return convertSharpToJpeg(await sharp(path), width, height);
}
export async function convertSharpToJpeg(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true
@ -35,7 +39,11 @@ export async function convertToJpeg(path: string, width: number, height: number)
* with resize, remove metadata, resolve orientation, stop animation
*/
export async function convertToWebp(path: string, width: number, height: number): Promise<IImage> {
const data = await sharp(path)
return convertSharpToWebp(await sharp(path), width, height);
}
export async function convertSharpToWebp(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true
@ -58,7 +66,11 @@ export async function convertToWebp(path: string, width: number, height: number)
* with resize, remove metadata, resolve orientation, stop animation
*/
export async function convertToPng(path: string, width: number, height: number): Promise<IImage> {
const data = await sharp(path)
return convertSharpToPng(await sharp(path), width, height);
}
export async function convertSharpToPng(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true
@ -73,3 +85,23 @@ export async function convertToPng(path: string, width: number, height: number):
type: 'image/png'
};
}
/**
* Convert to PNG or JPEG
* with resize, remove metadata, resolve orientation, stop animation
*/
export async function convertToPngOrJpeg(path: string, width: number, height: number): Promise<IImage> {
return convertSharpToPngOrJpeg(await sharp(path), width, height);
}
export async function convertSharpToPngOrJpeg(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const stats = await sharp.stats();
const metadata = await sharp.metadata();
// 不透明で300x300pxの範囲を超えていればJPEG
if (stats.isOpaque && ((metadata.width && metadata.width >= 300) || (metadata.height && metadata!.height >= 300))) {
return await convertSharpToJpeg(sharp, width, height);
} else {
return await convertSharpToPng(sharp, width, height);
}
}