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add write image cmd

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Shuanglei Tao
2025-05-10 23:30:22 +08:00
parent 2bd2a142eb
commit 493f7ae45f
7 changed files with 56 additions and 7 deletions
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4
html/js/dithering.js
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@@ -82,7 +82,7 @@ function dithering(ctx, width, height, threshold, type) {
}
// white: 1, black/red: 0
function canvas2bytes(canvas, type='bw', invert = false) {
function canvas2bytes(canvas, step = 'bw', invert = false) {
const ctx = canvas.getContext("2d");
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
@@ -92,7 +92,7 @@ function canvas2bytes(canvas, type='bw', invert = false) {
for (let y = 0; y < canvas.height; y++) {
for (let x = 0; x < canvas.width; x++) {
const i = (canvas.width * y + x) * 4;
if (type !== 'red') {
if (step === 'bw') {
buffer.push(imageData.data[i] === 0 && imageData.data[i+1] === 0 && imageData.data[i+2] === 0 ? 0 : 1);
} else {
buffer.push(imageData.data[i] > 0 && imageData.data[i+1] === 0 && imageData.data[i+2] === 0 ? 0 : 1);