mirror of
https://github.com/snapotter-hq/SnapOtter.git
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ashim-hq
2aadb66031
Extends the platform to handle 7 new image format families alongside the existing AVIF support gap-fill. Uses the established HEIC decoder pattern (CLI decode → PNG → Sharp) for formats Sharp can't handle natively: Camera RAW via dcraw_emu/LibRaw, PSD/TGA/EXR/HDR via ImageMagick. JXL and ICO are Sharp-native. Adds server-side preview for non-browser-displayable formats and JXL as a new convert output target. All 27 validateImageBuffer callers updated with filename for extension-based format detection.
59 lines
1.9 KiB
TypeScript
59 lines
1.9 KiB
TypeScript
import sharp from "sharp";
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export interface OutputFormat {
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format: keyof sharp.FormatEnum;
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extension: string;
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contentType: string;
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quality: number;
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}
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const FORMAT_MAP: Record<
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string,
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{ format: keyof sharp.FormatEnum; extension: string; contentType: string }
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> = {
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jpeg: { format: "jpeg", extension: "jpg", contentType: "image/jpeg" },
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png: { format: "png", extension: "png", contentType: "image/png" },
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webp: { format: "webp", extension: "webp", contentType: "image/webp" },
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gif: { format: "gif", extension: "gif", contentType: "image/gif" },
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tiff: { format: "tiff", extension: "tiff", contentType: "image/tiff" },
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avif: { format: "avif", extension: "avif", contentType: "image/avif" },
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heif: { format: "avif", extension: "avif", contentType: "image/avif" },
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jxl: { format: "png", extension: "png", contentType: "image/png" },
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};
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const DEFAULT_QUALITY = 95;
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const PNG_FALLBACK = FORMAT_MAP.png;
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/** Formats that have no Sharp output encoder — fall back to PNG. */
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const PNG_FALLBACK_FORMATS = new Set(["svg", "bmp", "raw", "tga", "psd", "exr", "hdr", "ico"]);
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/**
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* Detect the input image format and return matching output config.
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* Falls back to PNG for undetectable or unsupported output formats
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* (SVG, BMP, Camera RAW, TGA, PSD, EXR, HDR, ICO).
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*/
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export async function resolveOutputFormat(
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inputBuffer: Buffer,
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_filename: string,
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qualityOverride?: number,
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): Promise<OutputFormat> {
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let detected: string | undefined;
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try {
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const meta = await sharp(inputBuffer).metadata();
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detected = meta.format;
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} catch {
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// format detection failed
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}
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// Force PNG fallback for formats without a Sharp output encoder
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if (detected && PNG_FALLBACK_FORMATS.has(detected)) {
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detected = undefined;
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}
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const mapped = detected ? FORMAT_MAP[detected] : undefined;
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const config = mapped ?? PNG_FALLBACK;
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const quality = qualityOverride ?? DEFAULT_QUALITY;
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return { ...config, quality };
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}
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