66 lines
2.7 KiB
TypeScript
66 lines
2.7 KiB
TypeScript
/**
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* Encodes an RGBA image to a ThumbHash. RGB should not be premultiplied by A.
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*
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* @param w The width of the input image. Must be ≤100px.
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* @param h The height of the input image. Must be ≤100px.
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* @param rgba The pixels in the input image, row-by-row. Must have w*h*4 elements.
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* @returns The ThumbHash as a Uint8Array.
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*/
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export declare function rgbaToThumbHash(w: number, h: number, rgba: Uint8Array): Uint8Array<ArrayBuffer>;
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/**
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* Decodes a ThumbHash to an RGBA image. RGB is not be premultiplied by A.
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*
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* @param hash The bytes of the ThumbHash.
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* @returns The width, height, and pixels of the rendered placeholder image.
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*/
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export declare function thumbHashToRGBA(hash: Uint8Array): {
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w: number;
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h: number;
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rgba: Uint8Array<ArrayBuffer>;
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};
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/**
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* Extracts the average color from a ThumbHash. RGB is not be premultiplied by A.
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*
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* @param hash The bytes of the ThumbHash.
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* @returns The RGBA values for the average color. Each value ranges from 0 to 1.
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*/
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export declare function thumbHashToAverageRGBA(hash: Uint8Array): {
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r: number;
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g: number;
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b: number;
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a: number;
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};
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/**
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* Extracts the approximate aspect ratio of the original image.
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*
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* @param hash The bytes of the ThumbHash.
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* @returns The approximate aspect ratio (i.e. width / height).
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*/
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export declare function thumbHashToApproximateAspectRatio(hash: Uint8Array): number;
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/**
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* Encodes an RGBA image to a PNG data URL. RGB should not be premultiplied by
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* A. This is optimized for speed and simplicity and does not optimize for size
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* at all. This doesn't do any compression (all values are stored uncompressed).
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*
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* @param w The width of the input image. Must be ≤100px.
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* @param h The height of the input image. Must be ≤100px.
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* @param rgba The pixels in the input image, row-by-row. Must have w*h*4 elements.
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* @returns A data URL containing a PNG for the input image.
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*/
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export declare function rgbaToDataURL(w: number, h: number, rgba: Uint8Array): string;
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/**
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* Decodes a ThumbHash to a PNG data URL. This is a convenience function that
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* just calls "thumbHashToRGBA" followed by "rgbaToDataURL".
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*
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* @param hash The bytes of the ThumbHash.
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* @returns A data URL containing a PNG for the rendered ThumbHash.
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*/
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export declare function thumbHashToDataURL(hash: Uint8Array): string;
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/**
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* Convenience function added to the original thumbhash code, allows generating a thumbhash image directly from
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* thumbhash string.
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* @param thumbhash string from which thumbhashDataURL should be generated
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* @returns A data URL containing a PNG for the rendered ThumbHash
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*/
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export declare function thumbHashStringToDataURL(thumbhash: string): string;
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//# sourceMappingURL=thumbhash.d.ts.map
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