File size: 2,784 Bytes
7e3630c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | import { fileURLToPath } from "node:url";
import { Jimp } from "jimp";
export type JimpImage = Awaited<ReturnType<typeof Jimp.read>>;
export interface ImageOutputInfo {
width: number;
height: number;
channels: number;
size?: number;
}
export async function fetchImage(
src: Parameters<typeof Jimp.read>[0],
): Promise<JimpImage | undefined> {
try {
if (typeof src === "string" && src.startsWith("file://")) {
return await Jimp.read(fileURLToPath(src));
}
return await Jimp.read(src);
} catch {
return undefined;
}
}
export async function getRawPixels(
image: JimpImage,
): Promise<{ data: Buffer; info: ImageOutputInfo }> {
return {
data: image.bitmap.data,
info: {
width: image.bitmap.width,
height: image.bitmap.height,
channels: 4,
},
};
}
export async function getPngBuffer(
image: JimpImage,
): Promise<{ data: Buffer; info: ImageOutputInfo }> {
const buffer = await image.getBuffer("image/png");
return {
data: buffer,
info: {
width: image.bitmap.width,
height: image.bitmap.height,
channels: 4,
size: buffer.length,
},
};
}
export function calculateImageSize({
maxWidth,
maxHeight,
originalAspectRatio,
specifiedWidth,
specifiedHeight,
}: {
maxWidth: number;
maxHeight: number;
originalAspectRatio: number;
specifiedWidth?: number;
specifiedHeight?: number;
}): { width: number; height: number } {
// Both width and height specified
if (specifiedWidth && specifiedHeight) {
const width = Math.min(specifiedWidth, maxWidth);
const height = Math.min(specifiedHeight, maxHeight);
return { width: Math.round(width), height: Math.round(height) };
}
// Only width specified
if (specifiedWidth) {
let width = Math.min(specifiedWidth, maxWidth);
let height = width / originalAspectRatio;
if (height > maxHeight) {
height = maxHeight;
width = height * originalAspectRatio;
}
return { width: Math.round(width), height: Math.round(height) };
}
// Only height specified
if (specifiedHeight) {
let height = Math.min(specifiedHeight, maxHeight);
let width = height * originalAspectRatio;
if (width > maxWidth) {
width = maxWidth;
height = width / originalAspectRatio;
}
return { width: Math.round(width), height: Math.round(height) };
}
// No dimensions specified - scale to fit while maintaining aspect ratio
let height = maxHeight;
let width = height * originalAspectRatio;
if (width > maxWidth) {
width = maxWidth;
height = width / originalAspectRatio;
}
if (height > maxHeight) {
height = maxHeight;
width = height * originalAspectRatio;
}
return { width: Math.round(width), height: Math.round(height) };
}
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