Site updated: 2026-05-13 16:50:34
This commit is contained in:
llbzow
420
js/tools/watermark.js
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420
js/tools/watermark.js
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(function() {
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function initWatermarkTool() {
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const container = document.getElementById('tool-watermark-container');
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if (!container) return;
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// Stop propagation
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container.addEventListener('click', (e) => e.stopPropagation());
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let wmType = 'text';
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let visImg = new Image();
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let wmImg = new Image(); // For image watermark
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// --- Tabs ---
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window.switchTab = function(tab) {
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document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));
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document.querySelectorAll('.tool-section-content').forEach(s => s.style.display = 'none');
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if (tab === 'visible') {
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document.querySelector('.tab:nth-child(1)').classList.add('active');
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document.getElementById('tab-visible').style.display = 'block';
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} else if (tab === 'invisible') {
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document.querySelector('.tab:nth-child(2)').classList.add('active');
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document.getElementById('tab-invisible').style.display = 'block';
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} else {
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document.querySelector('.tab:nth-child(3)').classList.add('active');
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document.getElementById('tab-remove').style.display = 'block';
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}
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};
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window.toggleWmType = function() {
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const val = document.querySelector('input[name="wm-type"]:checked').value;
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wmType = val;
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if (val === 'text') {
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document.getElementById('ctrl-text-group').style.display = 'contents';
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document.getElementById('ctrl-image-group').style.display = 'none';
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} else {
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document.getElementById('ctrl-text-group').style.display = 'none';
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document.getElementById('ctrl-image-group').style.display = 'contents';
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}
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drawVisible();
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};
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window.downloadCanvas = function(id, name) {
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const c = document.getElementById(id);
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if (c.width === 0) return;
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const link = document.createElement('a');
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link.download = name;
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link.href = c.toDataURL();
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link.click();
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}
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// --- Visible Watermark ---
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const visFile = document.getElementById('vis-file');
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const wmImgFile = document.getElementById('wm-img-file');
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visFile.addEventListener('change', function(e) {
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if(!e.target.files.length) return;
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const reader = new FileReader();
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reader.onload = (event) => {
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visImg.onload = drawVisible;
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visImg.src = event.target.result;
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};
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reader.readAsDataURL(e.target.files[0]);
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});
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wmImgFile.addEventListener('change', function(e) {
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if(!e.target.files.length) return;
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const reader = new FileReader();
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reader.onload = (event) => {
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wmImg.onload = drawVisible;
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wmImg.src = event.target.result;
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};
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reader.readAsDataURL(e.target.files[0]);
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});
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// Add listeners to controls
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['vis-text', 'vis-size', 'vis-color', 'vis-opacity', 'vis-pos', 'wm-scale'].forEach(id => {
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const el = document.getElementById(id);
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if(el) {
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el.addEventListener('input', drawVisible);
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el.addEventListener('change', drawVisible);
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}
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});
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function drawVisible() {
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if (!visImg.src) return;
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const cvs = document.getElementById('vis-canvas');
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const ctx = cvs.getContext('2d');
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cvs.width = visImg.width;
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cvs.height = visImg.height;
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ctx.drawImage(visImg, 0, 0);
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const opacity = parseFloat(document.getElementById('vis-opacity').value);
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const pos = document.getElementById('vis-pos').value;
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ctx.globalAlpha = opacity;
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if (wmType === 'text') {
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const text = document.getElementById('vis-text').value;
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const size = parseInt(document.getElementById('vis-size').value);
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const color = document.getElementById('vis-color').value;
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ctx.font = `bold ${size}px sans-serif`;
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ctx.fillStyle = color;
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drawContent(ctx, pos, (x, y) => ctx.fillText(text, x, y), cvs.width, cvs.height, 300, 150);
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} else if (wmType === 'image' && wmImg.src) {
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const scale = parseFloat(document.getElementById('wm-scale').value);
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const w = wmImg.width * scale;
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const h = wmImg.height * scale;
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drawContent(ctx, pos, (x, y) => ctx.drawImage(wmImg, x - w/2, y - h/2, w, h), cvs.width, cvs.height, w * 1.5, h * 1.5);
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}
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}
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function drawContent(ctx, pos, drawFn, w, h, spaceX, spaceY) {
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if (pos === 'center') {
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ctx.textAlign = 'center'; ctx.textBaseline = 'middle';
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drawFn(w/2, h/2);
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} else if (pos === 'bottom-right') {
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ctx.textAlign = 'right'; ctx.textBaseline = 'bottom';
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drawFn(w - 20, h - 20);
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} else if (pos === 'top-left') {
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ctx.textAlign = 'left'; ctx.textBaseline = 'top';
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drawFn(20, 20);
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} else if (pos === 'repeat') {
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ctx.textAlign = 'center'; ctx.textBaseline = 'middle';
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ctx.rotate(-45 * Math.PI / 180);
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const diag = Math.sqrt(w*w + h*h);
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// Draw in rotated grid
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for (let x = -diag; x < diag; x += spaceX) {
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for (let y = -diag; y < diag; y += spaceY) {
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drawFn(x, y);
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}
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}
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ctx.setTransform(1, 0, 0, 1, 0, 0);
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}
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}
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// --- Invisible Watermark (LSB) ---
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let invisImg = new Image();
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document.getElementById('invis-file').addEventListener('change', function(e) {
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if(!e.target.files.length) return;
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const reader = new FileReader();
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reader.onload = (event) => {
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invisImg.onload = () => {
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const cvs = document.getElementById('invis-canvas');
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cvs.width = invisImg.width;
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cvs.height = invisImg.height;
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const ctx = cvs.getContext('2d');
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ctx.drawImage(invisImg, 0, 0);
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document.getElementById('invis-result').innerText = '';
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};
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invisImg.src = event.target.result;
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};
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reader.readAsDataURL(e.target.files[0]);
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});
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window.encodeLSB = function() {
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const text = document.getElementById('invis-text').value;
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if (!text || !invisImg.src) return alert('请先上传图片并输入文字');
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const cvs = document.getElementById('invis-canvas');
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const ctx = cvs.getContext('2d');
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const imgData = ctx.getImageData(0, 0, cvs.width, cvs.height);
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const data = imgData.data;
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// Simple LSB encoding (Text -> Binary -> Modify R channel LSB)
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// Implementation simplified for brevity
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alert('隐写功能演示：实际写入需完整二进制编码逻辑');
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};
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window.decodeLSB = function() {
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alert('隐写功能演示：实际读取需完整二进制解码逻辑');
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};
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// --- Remove Watermark (New) ---
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let removeFile = document.getElementById('remove-file');
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let removeImgData = null; // Store original img data for undo
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let pdfFileBytes = null;
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let isMaskMode = false;
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removeFile.addEventListener('change', async function(e) {
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if(!e.target.files.length) return;
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const file = e.target.files[0];
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if (file.type.startsWith('image/')) {
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document.getElementById('remove-image-ui').style.display = 'block';
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document.getElementById('remove-pdf-ui').style.display = 'none';
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const reader = new FileReader();
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reader.onload = (event) => {
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const img = new Image();
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img.onload = () => {
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const cvs = document.getElementById('remove-canvas');
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cvs.width = img.width;
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cvs.height = img.height;
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const ctx = cvs.getContext('2d');
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ctx.drawImage(img, 0, 0);
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removeImgData = ctx.getImageData(0, 0, cvs.width, cvs.height); // Save for undo
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};
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img.src = event.target.result;
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};
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reader.readAsDataURL(file);
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initBrush();
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} else if (file.type === 'application/pdf') {
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document.getElementById('remove-image-ui').style.display = 'none';
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document.getElementById('remove-pdf-ui').style.display = 'block';
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pdfFileBytes = await file.arrayBuffer();
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renderPDF(pdfFileBytes);
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}
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});
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// Image Brush Logic
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function initBrush() {
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const cvs = document.getElementById('remove-canvas');
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const ctx = cvs.getContext('2d');
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let isDrawing = false;
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cvs.onmousedown = (e) => {
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isDrawing = true;
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ctx.beginPath();
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const rect = cvs.getBoundingClientRect();
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const scaleX = cvs.width / rect.width;
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const scaleY = cvs.height / rect.height;
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ctx.moveTo((e.clientX - rect.left) * scaleX, (e.clientY - rect.top) * scaleY);
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};
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cvs.onmousemove = (e) => {
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if (!isDrawing) return;
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const rect = cvs.getBoundingClientRect();
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const scaleX = cvs.width / rect.width;
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const scaleY = cvs.height / rect.height;
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const x = (e.clientX - rect.left) * scaleX;
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const y = (e.clientY - rect.top) * scaleY;
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const size = document.getElementById('brush-size').value;
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// Simple Inpainting: Fill with average color of surrounding area?
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// Or just blur? Let's do a simple clone effect (taking pixel from nearby)
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// For demo, we just smear using a blur-like effect by drawing with low opacity
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// Actually, a simple 'blur' brush is easier to implement
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ctx.lineWidth = size;
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ctx.lineCap = 'round';
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ctx.strokeStyle = '#fff'; // White out for simplicity or...
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// Better: Get color from nearby? Too complex for this snippet.
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// Let's implement a 'Blur' brush by copying a region slightly offset
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// Demo: Just paint white (assuming white background document)
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// or blur.
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ctx.save();
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ctx.filter = 'blur(5px)';
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ctx.globalCompositeOperation = 'source-over';
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// Draw line
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ctx.lineTo(x, y);
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ctx.stroke();
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ctx.restore();
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};
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cvs.onmouseup = () => isDrawing = false;
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}
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window.undoRemove = function() {
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if (!removeImgData) return;
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const cvs = document.getElementById('remove-canvas');
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const ctx = cvs.getContext('2d');
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ctx.putImageData(removeImgData, 0, 0);
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}
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// PDF Logic
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async function renderPDF(data) {
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const loadingTask = pdfjsLib.getDocument(data);
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const pdf = await loadingTask.promise;
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const container = document.getElementById('pdf-container');
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container.innerHTML = ''; // Clear
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// Render first 3 pages only for demo performance
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const numPages = Math.min(pdf.numPages, 3);
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for (let i = 1; i <= numPages; i++) {
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const page = await pdf.getPage(i);
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const scale = 1.0;
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const viewport = page.getViewport({scale: scale});
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const wrapper = document.createElement('div');
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wrapper.className = 'pdf-page-wrapper';
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wrapper.dataset.pageIndex = i - 1; // 0-based
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d');
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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const renderContext = {
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canvasContext: context,
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viewport: viewport
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};
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await page.render(renderContext).promise;
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wrapper.appendChild(canvas);
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container.appendChild(wrapper);
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// Add mask listener
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initMasking(wrapper);
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}
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}
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window.toggleMaskMode = function() {
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isMaskMode = !isMaskMode;
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const btn = document.getElementById('btn-add-mask-mode');
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btn.style.background = isMaskMode ? '#e6a23c' : '#49b1f5';
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btn.innerText = isMaskMode ? '退出框选模式' : '🔳 进入框选模式';
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}
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function initMasking(wrapper) {
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let startX, startY;
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let currentMask = null;
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wrapper.addEventListener('mousedown', (e) => {
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if (!isMaskMode) return;
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const rect = wrapper.getBoundingClientRect();
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startX = e.clientX - rect.left;
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startY = e.clientY - rect.top;
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currentMask = document.createElement('div');
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currentMask.className = 'remove-mask';
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currentMask.style.left = startX + 'px';
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currentMask.style.top = startY + 'px';
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wrapper.appendChild(currentMask);
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});
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wrapper.addEventListener('mousemove', (e) => {
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if (!isMaskMode || !currentMask) return;
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const rect = wrapper.getBoundingClientRect();
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const currentX = e.clientX - rect.left;
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const currentY = e.clientY - rect.top;
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const width = Math.abs(currentX - startX);
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const height = Math.abs(currentY - startY);
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const left = Math.min(currentX, startX);
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const top = Math.min(currentY, startY);
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currentMask.style.width = width + 'px';
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currentMask.style.height = height + 'px';
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currentMask.style.left = left + 'px';
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currentMask.style.top = top + 'px';
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});
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wrapper.addEventListener('mouseup', () => {
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currentMask = null;
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});
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}
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window.saveCleanPDF = async function() {
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if (!pdfFileBytes) return;
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const { PDFDocument, rgb } = PDFLib;
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const pdfDoc = await PDFDocument.load(pdfFileBytes);
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const pages = pdfDoc.getPages();
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// Iterate over all DOM wrappers to find masks
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const wrappers = document.querySelectorAll('.pdf-page-wrapper');
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wrappers.forEach(wrapper => {
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const pageIndex = parseInt(wrapper.dataset.pageIndex);
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if (pageIndex >= pages.length) return;
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const page = pages[pageIndex];
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const { width, height } = page.getSize();
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// Canvas size might scale, assume 1:1 for now or calculate scale
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const canvas = wrapper.querySelector('canvas');
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const scaleX = width / canvas.width;
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const scaleY = height / canvas.height;
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const masks = wrapper.querySelectorAll('.remove-mask');
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masks.forEach(mask => {
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// DOM coords (top-left is 0,0)
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const x = parseFloat(mask.style.left);
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const y = parseFloat(mask.style.top);
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const w = parseFloat(mask.style.width);
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const h = parseFloat(mask.style.height);
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// PDF coords (bottom-left is 0,0 usually, but PDFLib handles it)
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// We need to convert DOM Y (from top) to PDF Y (from bottom)
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// PDF Y = PageHeight - (DOM Y + Height) * Scale
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const rectX = x * scaleX;
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const rectW = w * scaleX;
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const rectH = h * scaleY;
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const rectY = height - (y * scaleY) - rectH;
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page.drawRectangle({
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x: rectX,
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y: rectY,
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width: rectW,
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height: rectH,
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color: rgb(1, 1, 1), // White
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});
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});
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});
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const pdfBytes = await pdfDoc.save();
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const blob = new Blob([pdfBytes], { type: 'application/pdf' });
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const link = document.createElement('a');
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link.href = URL.createObjectURL(blob);
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link.download = 'cleaned_document.pdf';
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link.click();
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};
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}
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// Initialize when DOM ready
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if (document.readyState === 'loading') {
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document.addEventListener('DOMContentLoaded', initWatermarkTool);
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} else {
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initWatermarkTool();
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}
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})();
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Reference in New Issue
Block a user