60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
import { JimpClassSchema } from "@jimp/types";
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import { z } from "zod";
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const MaskOptionsObjectSchema = z.object({
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src: JimpClassSchema,
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/** the x position to draw the image */
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x: z.number().optional(),
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/** the y position to draw the image */
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y: z.number().optional(),
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});
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const MaskOptionsSchema = z.union([JimpClassSchema, MaskOptionsObjectSchema]);
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export const methods = {
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/**
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* Masks a source image on to this image using average pixel colour. A completely black pixel on the mask will turn a pixel in the image completely transparent.
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* @param src the source Jimp instance
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* @param x the horizontal position to blit the image
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* @param y the vertical position to blit the image
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* @example
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* ```ts
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* import { Jimp } from "jimp";
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*
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* const image = await Jimp.read("test/image.png");
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* const mask = await Jimp.read("test/mask.png");
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*
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* image.mask(mask);
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* ```
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*/
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mask(image, options) {
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MaskOptionsSchema.parse(options);
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let src;
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let x;
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let y;
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if ("bitmap" in options) {
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src = options;
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x = 0;
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y = 0;
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}
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else {
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src = options.src;
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x = options.x ?? 0;
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y = options.y ?? 0;
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}
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// round input
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x = Math.round(x);
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y = Math.round(y);
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const w = image.bitmap.width;
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const h = image.bitmap.height;
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src.scan(function (sx, sy, idx) {
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const destX = x + sx;
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const destY = y + sy;
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if (destX >= 0 && destY >= 0 && destX < w && destY < h) {
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const dstIdx = image.getPixelIndex(destX, destY);
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const { data } = src.bitmap;
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const avg = (data[idx + 0] + data[idx + 1] + data[idx + 2]) / 3;
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image.bitmap.data[dstIdx + 3] *= avg / 255;
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}
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});
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return image;
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},
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};
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//# sourceMappingURL=index.js.map
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