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drop 4gray support

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Shuanglei Tao
2025-04-13 12:11:24 +08:00
parent fbe875dc83
commit a52ad83b8c
6 changed files with 14 additions and 97 deletions
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40
html/js/dithering.js
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@@ -81,46 +81,6 @@ function dithering(ctx, width, height, threshold, type) {
ctx.putImageData(imageData, 0, 0);
}
/****Color display description****
white gray1 gray2 black
0x10| 01 01 00 00
0x13| 01 00 01 00
*********************************/
function canvas2gray(canvas) {
const ctx = canvas.getContext("2d");
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const arr10 = [];
const arr13 = [];
let buffer10 = [];
let buffer13 = [];
for (let y = 0; y < canvas.height; y++) {
for (let x = 0; x < canvas.width; x++) {
const i = (canvas.width * y + x) * 4;
const level = imageData.data[i] / 85;
const bin = level.toString(2).split('').map(bit => parseInt(bit, 2));
if (bin.length > 1) {
buffer10.push(bin[0]);
buffer13.push(bin[1]);
} else {
buffer10.push(0);
buffer13.push(bin[0]);
}
if (buffer10.length === 8) {
arr10.push(parseInt(buffer10.join(''), 2));
buffer10 = [];
}
if (buffer13.length === 8) {
arr13.push(parseInt(buffer13.join(''), 2));
buffer13 = [];
}
}
}
return arr10.concat(arr13);
}
// white: 1, black/red: 0
function canvas2bytes(canvas, type='bw', invert = false) {
const ctx = canvas.getContext("2d");