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Fix crop preprocessor

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This commit is contained in:
Jason Miller
2020-12-09 11:22:43 -05:00
parent b8574b228a
commit e3b053db12
1 changed files with 14 additions and 40 deletions
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54
src/features/preprocessors/crop/worker/crop.ts
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@@ -13,51 +13,25 @@
import { Options } from '../shared/meta';
export default async function crop(
data: ImageData,
opts: Options,
{ data, width, height }: ImageData,
{ top, right, bottom, left }: Options,
): Promise<ImageData> {
const { left, top, right, bottom } = opts;
const source = data.data;
const { width, height } = data;
const cols = width * 4;
const newWidth = width - left - right;
const newHeight = height - top - bottom;
const len = newWidth * newHeight * 4;
const pixels = new Uint8ClampedArray(len);
const cols = width * 4;
const newCols = newWidth * 4;
const pixels = new Uint8ClampedArray(data.buffer, 0, newHeight * newCols);
for (let y = 0; y < newHeight; y++) {
for (let x = 0; x < newWidth; x++) {
let i = y * cols + x * 4;
let j = (top + y) * cols + (left + x) * 4;
pixels[i] = source[j];
pixels[i + 1] = source[j + 1];
pixels[i + 2] = source[j + 2];
pixels[i + 3] = source[j + 3];
}
const x = left * 4;
const row = new Uint8ClampedArray(
data.buffer,
(top + y) * cols + x,
newCols,
);
pixels.set(row, y * newCols);
}
// let sourceX = left;
// let sourceY = top;
// let x = 0;
// let y = 0;
// let i = 0;
// while (i < len) {
// let from = sourceY * cols + sourceX * 4;
// pixels[i++] = source[from++];
// pixels[i++] = source[from++];
// pixels[i++] = source[from++];
// pixels[i++] = source[from];
// if (++x === newWidth) {
// x = 0;
// y++;
// sourceX = left;
// sourceY++;
// }
// }
return new ImageData(pixels, newWidth, newHeight);
return new ImageData(pixels.slice(), newWidth, newHeight);
}