/ldg/ Collage Script
Updated version of the collage script created by this anon. This enhanced version fixes several issues and adds video collage functionality, along with custom collages. For video collages, the more you add, the lower the bitrate given the filesize must always be unde 4MB in order to post on 4chan.
Alt-tabbing or switching browser tabs during the video creation process might cancel the encoding depending on your system setup/browser. It's also best to make a video collage when your GPU/system is idle, given the output video can glitch, be stuttery and go over 4MB if you're, say, genning while making a video collage. Not sure how to fix that given the limitations of using TamperMonkey/MediaRecorder like this.
Last Changes as of 22/06/25
- fixed pre-buffering issue on some browsers (blank and/or artifact prone initial frames)
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// @name 4chan Thumbnail Viewer & Collage Creator
// @namespace http://tampermonkey.net/
// @version 1.1.4
// @description Mark posts as highlights on the thread or in a thumbnail grid, review your selection, and make collages (image or video) out of them. Also supports custom collages via drag-and-drop.
// @match https://boards.4channel.org/*/thread/*
// @match https://boards.4chan.org/*/thread/*
// @grant GM_xmlhttpRequest
// @connect i.4cdn.org
// ==/UserScript==
(function() {
'use strict';
// =========================
// 1. CSS Styles
// =========================
const style = document.createElement('style');
style.innerHTML = `
/* Base highlight button */
.highlight-btn {
position: absolute;
top: 5px;
right: 5px;
background: rgba(255,255,0,0.7);
border: 1px solid #000;
padding: 2px 5px;
cursor: pointer;
z-index: 10;
font-weight: bold;
}
.highlighted {
border: 3px solid red !important;
}
/* Generic overlay for views */
.overlay {
position: fixed;
top: 0; left: 0; right: 0; bottom: 0;
background: rgba(0,0,0,0.8);
z-index: 1000;
overflow: auto;
padding: 10px;
display: flex;
flex-direction: column;
}
.overlay-content {
flex: 1;
display: flex;
flex-wrap: wrap;
justify-content: center;
position: relative;
}
/* Info button and content */
.overlay-info-button {
position: absolute;
top: 10px;
left: 10px;
background: #008;
color: #fff;
border: none;
padding: 4px 8px;
cursor: pointer;
z-index: 1100;
border-radius: 3px;
font-size: 14px;
}
.overlay-info-content {
position: absolute;
top: 45px;
left: 10px;
background: rgba(0,0,0,0.7);
color: #fff;
font-size: 12px;
padding: 5px;
border-radius: 3px;
z-index: 1100;
display: none;
max-width: 300px;
}
.overlay-close-button {
position: absolute;
top: 10px;
left: 70px; /* Adjust this value to position it right next to the '?' button */
background: red;
color: #fff;
border: none;
padding: 4px 8px;
cursor: pointer;
z-index: 1100;
border-radius: 3px;
font-size: 14px;
}
/* Thumbnail item */
.thumb-item {
margin: 5px;
position: relative;
cursor: pointer;
}
.thumb-item img {
transition: all 0.3s;
/* Default unexpanded size */
max-width: 150px;
max-height: 150px;
}
/* Selected thumbnails get a green border */
.thumb-item.selected {
outline: 4px solid #0f0;
}
/* Options (Collage) menu in bottom right */
.chan-hv-options-menu {
position: fixed;
bottom: 10px;
right: 10px;
background: rgba(0,0,0,0.8);
padding: 5px;
border-radius: 3px;
z-index: 1001;
}
.chan-hv-menu-header {
cursor: pointer;
color: #fff;
font-size: 16px;
user-select: none;
}
.chan-hv-menu-content {
display: none;
margin-top: 5px;
}
.chan-hv-menu-content button {
display: block;
margin: 3px 0;
background: #008;
color: #fff;
border: none;
padding: 5px 10px;
cursor: pointer;
font-size: 14px;
}
/* Collage button */
.collage-btn {
position: fixed;
top: 10px;
right: 10px;
z-index: 1100;
padding: 8px 12px;
background: #080;
color: #fff;
border: none;
cursor: pointer;
font-size: 14px;
}
/* Zoom slider styling */
.zoom-slider {
width: 200px;
}
/* Thread Thumbnails view */
.thumbnails-grid img {
margin: 5px;
}
/* Remove preset image size limits for thread view */
.thumbnails-grid .thumb-item img {
max-width: none;
max-height: none;
}
/* Header image input container in review view */
.header-input-container {
margin-bottom: 10px;
color: #fff;
font-size: 16px;
background-color: rgba(0, 0, 0, 0.5);
padding: 8px;
border-radius: 5px;
width: 100%;
text-align: center;
}
/* Review highlights view layout */
.review-highlights-container {
display: block !important;
}
.thumbs-container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.review-highlights-container .thumbs-container {
margin-top: 90px;
}
/* Counter style - NEW CENTERED LAYOUT */
#selected-counter-container {
position: absolute;
top: 50px;
left: 50%;
transform: translateX(-50%);
text-align: center;
color: #fff;
font-size: 16px;
z-index: 1050;
pointer-events: none; /* Make it non-interactive */
}
#selected-counter {
margin-bottom: 5px;
}
#selection-hint {
font-size: 12px;
color: #ccc;
}
/* Custom collage drop zone */
.custom-collage-container .drop-zone {
width: 95%;
height: calc(100% - 100px); /* Adjust height to fill space */
border: 3px dashed #555;
border-radius: 10px;
display: flex;
flex-wrap: wrap;
justify-content: center;
align-content: flex-start;
padding: 10px;
margin-top: 90px; /* Space for the counter */
color: #888;
font-size: 20px;
transition: background-color 0.3s, border-color 0.3s;
overflow-y: auto; /* Allow scrolling within the drop zone */
}
.custom-collage-container .drop-zone.drag-over {
background-color: rgba(255, 255, 255, 0.1);
border-color: #aaa;
}
/* Lightbox overlay for expanded media */
.lightbox-overlay {
position: fixed;
top: 0; left: 0;
width: 100vw;
height: 100vh;
background: rgba(0,0,0,0.9);
display: flex;
align-items: center;
justify-content: center;
z-index: 1200;
}
.lightbox-overlay > * {
max-width: 90vw;
max-height: 90vh;
object-fit: contain;
}
/* Video processing overlay */
#processing-overlay {
flex-direction: column;
}
#processing-message {
margin-top: 20px;
}
.spinner {
border: 8px solid #f3f3f3;
border-top: 8px solid #3498db;
border-radius: 50%;
width: 60px;
height: 60px;
animation: spin 1.5s linear infinite;
}
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
`;
document.head.appendChild(style);
// =========================
// 2. Global Variables & Scroll Management
// =========================
let selectedHeaderImage = null; // Object: { src, width, height }
let highlightedImages = [];
let originalBodyOverflowState = null; // For robust scroll lock management
function lockBodyScroll() {
if (originalBodyOverflowState === null) {
originalBodyOverflowState = document.body.style.overflow;
document.body.style.overflow = 'hidden';
}
}
function unlockBodyScroll() {
if (originalBodyOverflowState !== null) {
document.body.style.overflow = originalBodyOverflowState;
originalBodyOverflowState = null;
}
}
function getThreadKey() {
const threadMatch = window.location.href.match(/thread\/(\d+)/);
return threadMatch ? `highlightedImages_${threadMatch[1]}` : 'highlightedImages';
}
function loadHighlights() {
const saved = localStorage.getItem(getThreadKey());
if (saved) {
try {
highlightedImages = JSON.parse(saved);
} catch (e) {
console.error("Failed to parse saved highlights:", e);
}
}
}
function saveHighlights() {
localStorage.setItem(getThreadKey(), JSON.stringify(highlightedImages));
}
// =========================
// Global: UI Update Functions
// =========================
function updateReviewCounter() {
const counterDiv = document.getElementById('selected-counter');
if (counterDiv) {
const activeContainer = document.querySelector('.review-highlights-container, .custom-collage-container');
if (activeContainer) {
const count = activeContainer.querySelectorAll('.thumb-item.selected').length;
counterDiv.textContent = 'Selected: ' + count;
}
}
}
function updateCollageButtonText() {
const collageBtn = document.querySelector('.collage-btn');
const activeContainer = document.querySelector('.review-highlights-container, .custom-collage-container');
if (!collageBtn || !activeContainer) return;
const selectedItems = activeContainer.querySelectorAll('.thumb-item.selected');
let hasVideo = false;
for (const item of selectedItems) {
const img = item.querySelector('img');
const src = img.dataset.full || img.fileData;
if ((src instanceof File) ? src.type.startsWith('video/') : (src.endsWith('.webm') || src.endsWith('.mp4'))) {
hasVideo = true;
break;
}
}
collageBtn.textContent = hasVideo ? "Create Video Collage" : "Create Image Collage";
}
// =========================
// 3. Add Highlight Buttons to Posts
// =========================
function addHighlightButtons() {
const posts = document.querySelectorAll('.post');
const savedFullSrcs = highlightedImages.map(h => h.fullSrc);
posts.forEach(post => {
if (post.querySelector('.highlight-btn')) return; // Skip if already added
const thumbLink = post.querySelector('a.fileThumb');
if (!thumbLink) return;
const img = thumbLink.querySelector('img');
if (!img) return;
const fullSrc = thumbLink.href;
const btn = document.createElement('div');
btn.textContent = '★';
btn.className = 'highlight-btn';
post.style.position = 'relative';
// Restore highlight state from saved data
if (savedFullSrcs.includes(fullSrc)) {
post.classList.add('highlighted');
btn.style.background = 'rgba(0,255,0,0.7)';
}
btn.addEventListener('click', e => {
e.stopPropagation();
const index = highlightedImages.findIndex(item => item.fullSrc === fullSrc);
if (post.classList.contains('highlighted')) {
post.classList.remove('highlighted');
btn.style.background = 'rgba(255,255,0,0.7)';
if (index > -1) highlightedImages.splice(index, 1);
} else {
post.classList.add('highlighted');
btn.style.background = 'rgba(0,255,0,0.7)';
highlightedImages.push({ post: null, thumbSrc: img.src, fullSrc });
}
saveHighlights(); // <--- this is what persists it
});
post.appendChild(btn);
});
}
// =========================
// 4. Unified Thumbnail Behavior
// =========================
function setupUnifiedThumbnailBehavior(container, context = 'default') {
const thumbItems = container.querySelectorAll('.thumb-item');
thumbItems.forEach(item => {
const img = item.querySelector('img');
const fullSrc = img.dataset.full || img.fileData;
if (!img.dataset.thumb) {
img.dataset.thumb = img.src;
}
item.addEventListener('click', e => {
if (e.ctrlKey) {
if (context === 'review') {
item.classList.toggle('selected');
} else { // 'default' context for thread thumbnails view
if (item.classList.contains('selected')) {
item.classList.remove('selected');
removeFromHighlights(fullSrc);
} else {
item.classList.add('selected');
addToHighlights(fullSrc, img.dataset.thumb);
}
saveHighlights();
}
updateReviewCounter();
updateCollageButtonText(); // Update button text on selection change
} else {
const mediaList = Array.from(container.querySelectorAll('.thumb-item img')).map(i => {
const src = i.dataset.full || i.fileData;
const isVideo = (src instanceof File) ? src.type.startsWith('video/') : (src.endsWith('.webm') || src.endsWith('.mp4'));
return { src, type: isVideo ? 'video' : 'image' };
});
const currentIndex = mediaList.findIndex(m => m.src === fullSrc);
showLightbox(mediaList, currentIndex);
}
e.stopPropagation();
});
});
container.tabIndex = 0;
container.focus();
}
function addToHighlights(fullSrc, thumbSrc) {
if (!highlightedImages.find(item => item.fullSrc === fullSrc)) {
highlightedImages.push({ post: null, thumbSrc, fullSrc });
}
}
function removeFromHighlights(fullSrc) {
const idx = highlightedImages.findIndex(item => item.fullSrc === fullSrc);
if (idx > -1) highlightedImages.splice(idx, 1);
}
// =========================
// Lightbox Overlay with Navigation (Handles Video and Files)
// =========================
async function showLightbox(mediaList, currentIndex) {
let currentMediaElement = null;
const overlay = document.createElement('div');
overlay.className = 'lightbox-overlay';
async function showMedia(index) {
if (currentMediaElement) {
if(currentMediaElement.src.startsWith('blob:')) {
URL.revokeObjectURL(currentMediaElement.src);
}
overlay.removeChild(currentMediaElement);
}
const mediaItem = mediaList[index];
if (!mediaItem) return;
let mediaUrl;
if (mediaItem.src instanceof File) {
mediaUrl = URL.createObjectURL(mediaItem.src);
} else {
mediaUrl = mediaItem.src;
}
if (mediaItem.type === 'video') {
currentMediaElement = document.createElement('video');
currentMediaElement.autoplay = true;
currentMediaElement.loop = true;
currentMediaElement.controls = true;
currentMediaElement.muted = true;
} else {
currentMediaElement = document.createElement('img');
}
currentMediaElement.src = mediaUrl;
overlay.appendChild(currentMediaElement);
}
function keyHandler(e) {
if (e.key === 'ArrowLeft') {
currentIndex = (currentIndex - 1 + mediaList.length) % mediaList.length;
showMedia(currentIndex);
e.preventDefault();
} else if (e.key === 'ArrowRight') {
currentIndex = (currentIndex + 1) % mediaList.length;
showMedia(currentIndex);
e.preventDefault();
} else if (e.key === 'Escape') {
cleanup();
e.preventDefault();
}
}
function cleanup() {
if(currentMediaElement && currentMediaElement.src.startsWith('blob:')) {
URL.revokeObjectURL(currentMediaElement.src);
}
document.body.removeChild(overlay);
window.removeEventListener('keydown', keyHandler);
}
window.addEventListener('keydown', keyHandler);
overlay.addEventListener('click', cleanup);
await showMedia(currentIndex);
document.body.appendChild(overlay);
}
// =========================
// 5. Create a Generic Overlay View
// =========================
function createOverlayView(contentGenerator, closeCallback) {
const existing = document.querySelector('.overlay');
if (existing) {
existing.parentNode.removeChild(existing);
}
lockBodyScroll();
const overlay = document.createElement('div');
overlay.className = 'overlay';
overlay.tabIndex = 0;
overlay.addEventListener('keydown', e => {
if (e.key === 'Escape' && !document.querySelector('.lightbox-overlay')) {
cleanup();
}
});
const infoButton = document.createElement('button');
infoButton.className = 'overlay-info-button';
infoButton.textContent = '?';
const infoContent = document.createElement('div');
infoContent.className = 'overlay-info-content';
infoContent.textContent = 'Click: Preview media. Ctrl+Click: Select/Deselect for collage. Esc: Close view.';
infoButton.addEventListener('click', () => {
infoContent.style.display = (infoContent.style.display === 'none' || infoContent.style.display === '')
? 'block'
: 'none';
});
const closeButton = document.createElement('button');
closeButton.className = 'overlay-close-button';
closeButton.textContent = 'X';
closeButton.addEventListener('click', cleanup);
overlay.appendChild(infoButton);
overlay.appendChild(infoContent);
overlay.appendChild(closeButton);
const content = contentGenerator();
overlay.appendChild(content);
overlay.focus();
function cleanup() {
unlockBodyScroll();
document.body.removeChild(overlay);
if (closeCallback) closeCallback();
}
overlay.addEventListener('click', e => {
if (e.target === overlay) cleanup();
});
document.body.appendChild(overlay);
}
// =========================
// 6. Review Highlights View
// =========================
function showReviewHighlightsView() {
const contentGenerator = () => {
const container = document.createElement('div');
container.className = 'overlay-content review-highlights-container';
const headerContainer = document.createElement('div');
headerContainer.className = 'header-input-container';
headerContainer.innerHTML = `<label style="margin-right:5px;">Header image (optional):</label>`;
const headerInput = document.createElement('input');
headerInput.type = 'file';
headerInput.accept = 'image/*';
headerInput.addEventListener('change', e => {
const file = e.target.files[0];
if (!file) return;
const reader = new FileReader();
reader.onload = function(evt) {
const tempImg = new Image();
tempImg.onload = function() {
selectedHeaderImage = {
src: evt.target.result,
width: tempImg.naturalWidth,
height: tempImg.naturalHeight
};
};
tempImg.src = evt.target.result;
};
reader.readAsDataURL(file);
});
headerContainer.appendChild(headerInput);
container.appendChild(headerContainer);
const counterContainer = document.createElement('div');
counterContainer.id = 'selected-counter-container';
counterContainer.innerHTML = `
<div id="selected-counter">Selected: 0</div>
<div id="selection-hint">(Ctrl+Click to temporarily select/deselect)</div>
`;
container.appendChild(counterContainer);
const thumbsContainer = document.createElement('div');
thumbsContainer.className = 'thumbs-container';
highlightedImages.forEach(item => {
const thumbDiv = document.createElement('div');
thumbDiv.className = 'thumb-item selected';
const img = document.createElement('img');
img.src = item.thumbSrc;
img.dataset.thumb = item.thumbSrc;
img.dataset.full = item.fullSrc;
thumbDiv.appendChild(img);
thumbsContainer.appendChild(thumbDiv);
});
container.appendChild(thumbsContainer);
const collageBtn = document.createElement('button');
collageBtn.className = "collage-btn";
collageBtn.addEventListener("click", createCollage);
container.appendChild(collageBtn);
// Pass 'review' context to enable special deselection loogic
setTimeout(() => {
setupUnifiedThumbnailBehavior(thumbsContainer, 'review');
updateReviewCounter();
updateCollageButtonText();
}, 0);
return container;
};
createOverlayView(contentGenerator);
}
// =========================
// 6b. Custom Collage View (NEW)
// =========================
function showCustomCollageView() {
const contentGenerator = () => {
const container = document.createElement('div');
container.className = 'overlay-content custom-collage-container';
const counterContainer = document.createElement('div');
counterContainer.id = 'selected-counter-container';
counterContainer.innerHTML = `
<div id="selected-counter">Selected: 0</div>
<div id="selection-hint">(Ctrl+Click to select/deselect)</div>
`;
container.appendChild(counterContainer);
const dropZone = document.createElement('div');
dropZone.className = 'drop-zone thumbs-container';
dropZone.innerHTML = '<p style="align-self: center; text-align: center;">Drag & Drop Images (jpg, png) or Videos (webm, mp4) Here</p>';
container.appendChild(dropZone);
const allowedTypes = ['image/jpeg', 'image/png', 'video/webm', 'video/mp4'];
const handleFiles = async (files) => {
const promptText = dropZone.querySelector('p');
if (promptText) promptText.remove();
const filePromises = [];
for (const file of files) {
if (!allowedTypes.includes(file.type)) {
console.warn(`Skipping unsupported file type: ${file.name} (${file.type})`);
continue;
}
const promise = new Promise(resolve => {
const thumbDiv = document.createElement('div');
thumbDiv.className = 'thumb-item selected';
const imgThumb = document.createElement('img');
imgThumb.fileData = file;
thumbDiv.appendChild(imgThumb);
if (file.type.startsWith('image/')) {
imgThumb.src = URL.createObjectURL(file);
imgThumb.onload = () => resolve(thumbDiv);
imgThumb.onerror = () => resolve(null);
} else if (file.type.startsWith('video/')) {
const video = document.createElement('video');
const canvas = document.createElement('canvas');
video.src = URL.createObjectURL(file);
video.onloadeddata = () => { video.currentTime = Math.min(1, video.duration / 2); };
video.onseeked = () => {
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
imgThumb.src = canvas.toDataURL('image/jpeg');
URL.revokeObjectURL(video.src);
resolve(thumbDiv);
};
video.onerror = () => resolve(null);
}
});
filePromises.push(promise);
}
const thumbDivs = await Promise.all(filePromises);
thumbDivs.forEach(div => { if (div) dropZone.appendChild(div); });
setupUnifiedThumbnailBehavior(dropZone, 'review');
updateReviewCounter();
updateCollageButtonText();
};
dropZone.addEventListener('dragover', (e) => { e.preventDefault(); e.stopPropagation(); dropZone.classList.add('drag-over'); });
dropZone.addEventListener('dragleave', (e) => { e.preventDefault(); e.stopPropagation(); dropZone.classList.remove('drag-over'); });
dropZone.addEventListener('drop', (e) => { e.preventDefault(); e.stopPropagation(); dropZone.classList.remove('drag-over'); handleFiles(e.dataTransfer.files); });
const collageBtn = document.createElement('button');
collageBtn.className = "collage-btn";
collageBtn.addEventListener("click", createCollage);
container.appendChild(collageBtn);
setTimeout(() => { // Set initial button text
updateCollageButtonText();
}, 0);
return container;
};
createOverlayView(contentGenerator);
}
// =========================
// 7. Thread Thumbnails View
// =========================
function showThreadThumbnailsView() {
const contentGenerator = () => {
const container = document.createElement('div');
container.className = 'overlay-content thumbnails-grid';
const sliderContainer = document.createElement('div');
sliderContainer.style.textAlign = 'center';
sliderContainer.style.width = '100%';
sliderContainer.style.marginBottom = '10px';
const zoomLabel = document.createElement('label');
zoomLabel.textContent = 'Zoom: ';
const zoomSlider = document.createElement('input');
zoomSlider.type = 'range';
zoomSlider.className = 'zoom-slider';
zoomSlider.min = 50;
zoomSlider.max = 400;
zoomSlider.value = 100;
zoomSlider.style.margin = '10px';
sliderContainer.appendChild(zoomLabel);
sliderContainer.appendChild(zoomSlider);
container.appendChild(sliderContainer);
const thumbsContainer = document.createElement('div');
thumbsContainer.className = 'thumbs-container';
const thumbs = document.querySelectorAll('a.fileThumb img');
thumbs.forEach(imgEl => {
const thumbDiv = document.createElement('div');
thumbDiv.className = 'thumb-item';
const clone = document.createElement('img');
clone.src = imgEl.src;
clone.dataset.thumb = imgEl.src;
const parentLink = imgEl.closest('a.fileThumb');
clone.dataset.full = parentLink ? parentLink.href : imgEl.src;
clone.onload = function() {
const naturalW = clone.naturalWidth;
const baseW = naturalW > 200 ? 200 : naturalW;
clone.dataset.baseWidth = baseW;
const scale = zoomSlider.value / 100;
clone.style.width = (baseW * scale) + 'px';
};
if (highlightedImages.some(item => item.fullSrc === clone.dataset.full)) {
thumbDiv.classList.add('selected');
}
thumbDiv.appendChild(clone);
thumbsContainer.appendChild(thumbDiv);
});
container.appendChild(thumbsContainer);
// Use default context here for permanent selection
setTimeout(() => { setupUnifiedThumbnailBehavior(thumbsContainer); }, 0);
zoomSlider.addEventListener('input', () => {
const scale = zoomSlider.value / 100;
const images = thumbsContainer.querySelectorAll('img');
images.forEach(img => {
if (!img.closest('.thumb-item').classList.contains('expanded')) {
const base = img.dataset.baseWidth ? parseFloat(img.dataset.baseWidth) : 150;
img.style.width = (base * scale) + 'px';
img.style.height = 'auto';
}
});
});
return container;
};
createOverlayView(contentGenerator);
}
// =========================
// 8. Get Collage Items & Create Collage
// =========================
function getItemsForCollage() {
const reviewContainer = document.querySelector('.review-highlights-container');
const customContainer = document.querySelector('.custom-collage-container');
if (customContainer) {
const selectedThumbs = customContainer.querySelectorAll('.thumb-item.selected');
return Array.from(selectedThumbs).map(thumb => {
const img = thumb.querySelector('img');
return { fullSrc: img.fileData, thumbSrc: img.src }; // fullSrc is a File object
});
}
if (reviewContainer) {
const selectedThumbs = reviewContainer.querySelectorAll('.thumb-item.selected');
return Array.from(selectedThumbs).map(thumb => {
const img = thumb.querySelector('img');
return { fullSrc: img.dataset.full, thumbSrc: img.dataset.thumb };
});
}
return highlightedImages; // Fallback for thread context
}
async function createCollage() {
const isCustomCollage = !!document.querySelector('.custom-collage-container');
const itemsForCollage = getItemsForCollage();
if (itemsForCollage.length === 0) {
alert("No items selected for collage.");
return;
}
const hasVideo = itemsForCollage.some(item => {
const src = item.fullSrc;
return (src instanceof File)
? src.type.startsWith('video/')
: (src.endsWith('.webm') || src.endsWith('.mp4'));
});
if (hasVideo) {
console.log("Video detected in selection. Switching to video collage mode.");
createVideoCollage(itemsForCollage, isCustomCollage);
return;
}
createImageCollage(itemsForCollage, isCustomCollage);
}
// =========================
// 8a. Image Collage Creation
// =========================
async function createImageCollage(itemsForCollage, isCustomCollage = false) {
const numCollages = parseInt(prompt("Enter number of collages:", "1"), 10);
const targetMP = parseFloat(prompt("Enter target megapixels per image (e.g., 1 for 1MP):", "0.3"));
const targetAspect = parseFloat(prompt("Enter target aspect ratio (e.g., 1 for square, 1.33 for 4:3):", "1"));
if (!numCollages || !targetMP || !targetAspect) {
alert("Invalid input.");
return;
}
const targetArea = targetMP * 1e6;
let L = [];
for (let i = 0; i < itemsForCollage.length; i++) {
const imgData = itemsForCollage[i];
try {
const dims = await getMediaDimensions(imgData.fullSrc);
L.push({ src: imgData.fullSrc, width: dims.width, height: dims.height, type: dims.type });
} catch (err) {
console.error("Failed to load image dimensions for", imgData.fullSrc, err);
}
}
if (L.length === 0) {
alert("No images available for collage.");
return;
}
const collages = roundRobinCollageLayout(L, numCollages, targetArea, selectedHeaderImage, targetAspect);
if (!collages || collages.length === 0) {
alert("Collage layout failed.");
return;
}
let collagePromises = collages.map((collage, collageIndex) => {
return new Promise(resolve => {
const canvas = document.createElement("canvas");
canvas.width = collage.width;
canvas.height = collage.height;
const ctx = canvas.getContext("2d");
ctx.fillStyle = "#fff";
ctx.fillRect(0, 0, canvas.width, canvas.height);
let placementPromises = collage.placements.map(placement => {
return new Promise(r => {
fetchImageAsBlob(placement.image.src)
.then(blob => {
const blobUrl = URL.createObjectURL(blob);
const imageEl = new Image();
imageEl.onload = function() {
ctx.drawImage(imageEl, placement.x, placement.y, placement.width, placement.height);
URL.revokeObjectURL(blobUrl);
r();
};
imageEl.onerror = e => { console.error("Error loading image:", placement.image.src, e); r(); };
imageEl.src = blobUrl;
})
.catch(err => { console.error("Fetch/GM_xmlhttpRequest error:", err); r(); });
});
});
Promise.all(placementPromises).then(() => {
const dataUrl = canvas.toDataURL('image/png');
const currentUnixTime = Math.floor(Date.now() / 1000);
let filename;
if (isCustomCollage) {
filename = `collage_${currentUnixTime}_${collageIndex + 1}.png`;
} else {
const url = window.location.href;
const boardMatch = url.match(/boards\.4chan(?:nel)?\.org\/([^\/]+)\//);
const board = boardMatch ? boardMatch[1] : "unknown";
const threadMatch = url.match(/thread\/(\d+)/);
const thread = threadMatch ? threadMatch[1] : "unknown";
filename = `highlights_${board}_${thread}_${currentUnixTime}_${collageIndex+1}.png`;
}
const downloadContainer = document.createElement('div');
Object.assign(downloadContainer.style, {
position: 'fixed', top: '20px', left: '50%', transform: 'translateX(-50%)',
background: 'rgba(0, 0, 0, 0.9)', padding: '20px', zIndex: '2000',
borderRadius: '10px', color: '#fff', textAlign: 'center'
});
const pngBtn = document.createElement('button');
Object.assign(pngBtn.style, {
margin: '10px', padding: '10px', background: '#008', color: '#fff',
border: 'none', cursor: 'pointer', fontSize: '16px'
});
pngBtn.textContent = 'Download Raw .png';
pngBtn.addEventListener('click', () => {
const a = document.createElement('a'); a.href = dataUrl; a.download = filename;
document.body.appendChild(a); a.click(); document.body.removeChild(a);
document.body.removeChild(downloadContainer);
unlockBodyScroll(); // Restore scroll
});
const jpgBtn = document.createElement('button');
Object.assign(jpgBtn.style, {
margin: '10px', padding: '10px', background: '#080', color: '#fff',
border: 'none', cursor: 'pointer', fontSize: '16px'
});
jpgBtn.textContent = 'Download Compressed .jpg';
jpgBtn.addEventListener('click', async () => {
let quality = 0.92;
let blob;
do {
const jpegDataUrl = canvas.toDataURL('image/jpeg', quality);
blob = dataURLToBlob(jpegDataUrl);
if (blob.size <= 3.99 * 1024 * 1024) {
const a = document.createElement('a'); a.href = URL.createObjectURL(blob);
a.download = filename.replace('.png', '.jpg');
document.body.appendChild(a); a.click(); document.body.removeChild(a);
document.body.removeChild(downloadContainer);
unlockBodyScroll(); // Restore scroll
return;
}
quality -= 0.05;
} while (quality > 0.1);
alert("Couldn't compress JPG under 3.99MB!");
});
downloadContainer.appendChild(pngBtn);
downloadContainer.appendChild(jpgBtn);
document.body.appendChild(downloadContainer);
resolve();
});
});
});
Promise.all(collagePromises).then(() => {
const existing = document.querySelector('.overlay');
if (existing) existing.parentNode.removeChild(existing);
});
}
// =========================
// 8b. Video Collage Creation
// =========================
async function createVideoCollage(itemsForCollage, isCustomCollage = false) {
let duration = parseInt(prompt("Enter collage duration in seconds (1-10):", "5"), 10);
if (isNaN(duration) || duration < 1 || duration > 10) {
alert("Invalid duration. Please enter a number between 1 and 10.");
return;
}
const targetMP = parseFloat(prompt("Enter target megapixels per element (e.g., 0.3):", "0.3"));
const targetAspect = parseFloat(prompt("Enter target collage aspect ratio (e.g., 1 for square):", "1"));
if (!targetMP || !targetAspect) {
alert("Invalid input.");
return;
}
showProcessingOverlay("Preparing media...");
const targetArea = targetMP * 1e6;
let L = [];
const mediaPromises = itemsForCollage.map(item => getMediaDimensions(item.fullSrc).then(dims => {
L.push({ src: item.fullSrc, width: dims.width, height: dims.height, type: dims.type });
}).catch(err => console.error("Failed to get dimensions for", item.fullSrc, err)));
await Promise.all(mediaPromises);
const collages = roundRobinCollageLayout(L, 1, targetArea, selectedHeaderImage, targetAspect);
if (!collages || collages.length === 0) {
alert("Collage layout failed.");
hideProcessingOverlay();
return;
}
const layout = collages[0];
let canvas = document.createElement('canvas');
let scale = 1.0;
if (layout.width > 2048 || layout.height > 2048) {
scale = Math.min(2048 / layout.width, 2048 / layout.height);
}
canvas.width = Math.round(layout.width * scale);
canvas.height = Math.round(layout.height * scale);
const ctx = canvas.getContext('2d');
ctx.fillStyle = "#fff"; ctx.fillRect(0, 0, canvas.width, canvas.height);
updateProcessingOverlay("Loading videos and images...");
const mediaElements = {};
const getUniqueKey = (src) => {
return (src instanceof File) ? `${src.name}_${src.size}_${src.lastModified}` : src;
};
const loadPromises = layout.placements.map(p => {
return new Promise(async (resolve, reject) => {
const itemSrc = p.image.src;
const uniqueKey = getUniqueKey(itemSrc);
if (mediaElements[uniqueKey]) return resolve();
const blob = await fetchImageAsBlob(itemSrc).catch(reject); if(!blob) return;
const blobUrl = URL.createObjectURL(blob);
if (p.image.type === 'video') {
const video = document.createElement('video');
video.crossOrigin = 'anonymous'; video.muted = true; video.loop = true; video.playsInline = true;
video.oncanplaythrough = () => { mediaElements[uniqueKey] = video; resolve(); };
video.onerror = reject; video.src = blobUrl;
} else {
const img = new Image();
img.crossOrigin = 'anonymous';
img.onload = () => { mediaElements[uniqueKey] = img; resolve(); };
img.onerror = reject; img.src = blobUrl;
}
});
});
await Promise.all(loadPromises);
const selectedFormat = { mimeType: 'video/webm; codecs=vp8', extension: 'webm' };
if (!MediaRecorder.isTypeSupported(selectedFormat.mimeType)) {
console.warn(`'video/webm; codecs=vp8' is not supported. Trying 'video/webm'.`);
selectedFormat.mimeType = 'video/webm';
if (!MediaRecorder.isTypeSupported(selectedFormat.mimeType)) {
alert("Your browser does not support the required video format (WebM).");
hideProcessingOverlay();
return;
}
}
console.log(`Using supported video format: ${selectedFormat.mimeType}`);
const targetBitrate = (3.8 * 1024 * 1024 * 8) / duration;
const stream = canvas.captureStream(30); // capture at 30fps
const recorder = new MediaRecorder(stream, { mimeType: selectedFormat.mimeType, videoBitsPerSecond: targetBitrate });
const chunks = [];
recorder.ondataavailable = e => chunks.push(e.data);
recorder.onstop = () => {
const blob = new Blob(chunks, { type: selectedFormat.mimeType });
const videoURL = URL.createObjectURL(blob);
Object.values(mediaElements).forEach(el => {
if (el.src.startsWith('blob:')) URL.revokeObjectURL(el.src);
});
const currentUnixTime = Math.floor(Date.now()/1000);
let filename;
if (isCustomCollage) {
filename = `collage_${currentUnixTime}.${selectedFormat.extension}`;
} else {
const url = window.location.href;
const boardMatch = url.match(/boards\.4chan(?:nel)?\.org\/([^\/]+)\//);
const board = boardMatch ? boardMatch[1] : "unknown";
const threadMatch = url.match(/thread\/(\d+)/);
const thread = threadMatch ? threadMatch[1] : "unknown";
filename = `highlights_${board}_${thread}_${currentUnixTime}.${selectedFormat.extension}`;
}
const a = document.createElement('a'); a.href = videoURL; a.download = filename;
document.body.appendChild(a); a.click(); document.body.removeChild(a);
hideProcessingOverlay();
const existingOverlay = document.querySelector('.overlay');
if (existingOverlay) existingOverlay.parentNode.removeChild(existingOverlay);
unlockBodyScroll();
};
let animationFrameId;
function drawFrame() {
ctx.fillRect(0, 0, canvas.width, canvas.height);
layout.placements.forEach(p => {
const uniqueKey = getUniqueKey(p.image.src);
const mediaEl = mediaElements[uniqueKey];
const x = p.x * scale, y = p.y * scale, w = p.width * scale, h = p.height * scale;
if (mediaEl) ctx.drawImage(mediaEl, x, y, w, h);
});
animationFrameId = requestAnimationFrame(drawFrame);
}
// prime the canvas and encoder before starting to record
updateProcessingOverlay(`Rendering video (${duration}s)...`);
Object.values(mediaElements).forEach(el => { if (el.tagName === 'VIDEO') el.play().catch(e=>console.error(e)); });
// start the drawing loop immediately to get content on the canvas
drawFrame();
// delay the start of the recording by a small amount to avoid initial white/blank frames
const startDelay = 250; // milliseconds
setTimeout(() => {
recorder.start();
// schedule the recorder to stop after the desired duration
setTimeout(() => {
recorder.stop();
cancelAnimationFrame(animationFrameId);
Object.values(mediaElements).forEach(el => { if (el.tagName === 'VIDEO') el.pause(); });
updateProcessingOverlay("Finalizing video file...");
}, duration * 1000);
}, startDelay);
}
// =========================
// 8c. Video Creation UI Helpers
// =========================
function showProcessingOverlay(message) {
let overlay = document.getElementById('processing-overlay');
if (!overlay) {
overlay = document.createElement('div');
overlay.id = 'processing-overlay';
Object.assign(overlay.style, {
position: 'fixed', top: '0', left: '0', width: '100vw', height: '100vh',
backgroundColor: 'rgba(0, 0, 0, 0.75)', color: 'white', display: 'flex',
alignItems: 'center', justifyContent: 'center', zIndex: '9999',
fontSize: '24px', flexDirection: 'column'
});
overlay.innerHTML = `<div class="spinner"></div><span id="processing-message"></span>`;
document.body.appendChild(overlay);
}
overlay.style.display = 'flex';
document.getElementById('processing-message').textContent = message;
}
function updateProcessingOverlay(message) {
const msgElement = document.getElementById('processing-message');
if (msgElement) msgElement.textContent = message;
}
function hideProcessingOverlay() {
const overlay = document.getElementById('processing-overlay');
if (overlay) overlay.style.display = 'none';
}
// =========================
// 9. Round-Robin Collage Layout
// =========================
function roundRobinCollageLayout(L, numCollages, targetArea, headerImage, targetAspect) {
L.forEach(img => {
let s = Math.sqrt(targetArea / (img.width * img.height));
img.scaledWidth = img.width * s;
img.scaledHeight = img.height * s;
});
L.sort((a, b) => (a.width / a.height) - (b.width / b.height));
let groups = [];
for (let i = 0; i < numCollages; i++) { groups.push([]); }
for (let i = 0; i < L.length; i++) { groups[i % numCollages].push(L[i]); }
let collages = [];
groups.forEach((group, groupIndex) => {
if (group.length === 0) return;
let m = group.length;
let numColumns = Math.ceil(Math.sqrt(m) * targetAspect);
let rows = [];
for (let i = 0; i < m; i += numColumns) { rows.push(group.slice(i, i + numColumns)); }
let allBoxes = rows.flat();
let sortedByWidth = [...allBoxes].sort((a, b) => b.scaledWidth - a.scaledWidth);
for (let r = 0; r < rows.length - 1; r++) {
let desired = sortedByWidth[r];
if (rows[r][0] !== desired) {
for (let r2 = r; r2 < rows.length; r2++) {
let idx = rows[r2].indexOf(desired);
if (idx !== -1) { [rows[r][0], rows[r2][idx]] = [rows[r2][idx], rows[r][0]]; break; }
}
}
}
if (rows.length > 1) {
const rowMetrics = rows.map(row => {
const baseHeight = row[0].scaledHeight;
let totalWidth = 0;
for (const img of row) { totalWidth += img.scaledWidth * (baseHeight / img.scaledHeight); }
return { baseHeight, totalWidth };
});
const maxRowWidth = Math.max(...rowMetrics.map(m => m.totalWidth));
const finalHeights = rowMetrics.map(m => m.baseHeight * (maxRowWidth / m.totalWidth));
const bottomFinalHeight = finalHeights[finalHeights.length - 1];
let minFinalHeight = Infinity;
for (let i = 0; i < finalHeights.length - 1; i++) {
if (finalHeights[i] < minFinalHeight) minFinalHeight = finalHeights[i];
}
if (bottomFinalHeight > 1.8 * minFinalHeight) {
const bottomRow = rows[rows.length - 1];
if (bottomRow.length === 1) {
let tallestRowIndex = -1, maxFinalHeight = -Infinity;
for (let i = 0; i < finalHeights.length - 1; i++) {
if (finalHeights[i] > maxFinalHeight) { maxFinalHeight = finalHeights[i]; tallestRowIndex = i; }
}
if (tallestRowIndex !== -1) {
rows[tallestRowIndex].push(bottomRow.pop());
if (bottomRow.length === 0) rows.pop();
}
} else {
let donorRowIndex = -1, minRowFinalHeight = Infinity;
for (let i = 0; i < finalHeights.length - 1; i++) {
if (finalHeights[i] < minRowFinalHeight) { minRowFinalHeight = finalHeights[i]; donorRowIndex = i; }
}
if (donorRowIndex !== -1 && rows[donorRowIndex].length > 0) {
const donorRow = rows[donorRowIndex];
let widestImageIndex = donorRow.reduce((maxIdx, img, i, arr) => (img.scaledWidth > arr[maxIdx].scaledWidth) ? i : maxIdx, 0);
bottomRow.push(donorRow.splice(widestImageIndex, 1)[0]);
}
}
}
}
rows = rows.map(row => row.sort(() => Math.random() - 0.5));
if (headerImage) {
let narrowestRowIndex = 0, minRowWidth = Infinity;
rows.forEach((row, idx) => {
let width = row.reduce((sum, img) => sum + img.scaledWidth, 0);
if (width < minRowWidth) { minRowWidth = width; narrowestRowIndex = idx; }
});
const baseHeight = rows[narrowestRowIndex][0].scaledHeight;
const factor = baseHeight / headerImage.height;
const headerScaled = { src: headerImage.src, width: headerImage.width, height: headerImage.height, scaledWidth: headerImage.width * factor, scaledHeight: baseHeight, type: 'image' };
rows[narrowestRowIndex].unshift(headerScaled);
}
let rowLayouts = rows.map(row => {
let baseHeight = row[0].scaledHeight;
let cells = row.map(img => ({ image: img, width: img.scaledWidth * (baseHeight / img.scaledHeight), height: baseHeight }));
let totalWidth = cells.reduce((sum, cell) => sum + cell.width, 0);
return { cells, width: totalWidth, height: baseHeight };
});
let maxRowWidth = Math.max(...rowLayouts.map(r => r.width));
rowLayouts = rowLayouts.map(r => {
if (r.width < maxRowWidth) {
let factor = maxRowWidth / r.width;
return { cells: r.cells.map(cell => ({ image: cell.image, width: cell.width * factor, height: cell.height * factor })), width: r.width * factor, height: r.height * factor };
} else {
return r;
}
});
let placements = []; let y = 0;
rowLayouts.forEach(r => {
let x = 0;
r.cells.forEach(cell => {
placements.push({ image: cell.image, x: x, y: y, width: cell.width, height: cell.height });
x += cell.width;
});
y += r.height;
});
collages.push({ width: maxRowWidth, height: y, placements });
});
return collages;
}
// =========================
// 10. Utility: Fetch media as blob (Handles URLs and Files)
// =========================
function fetchImageAsBlob(source) {
if (source instanceof File) {
return Promise.resolve(source);
}
if (String(source).startsWith('data:')) {
return fetch(source).then(res => res.blob());
}
return new Promise((resolve, reject) => {
GM_xmlhttpRequest({
method: "GET", url: source, responseType: "blob",
onload: res => (res.status === 200) ? resolve(res.response) : reject(new Error("Fetch failed: " + res.status)),
onerror: err => reject(err)
});
});
}
function dataURLToBlob(dataURL) {
const binary = atob(dataURL.split(',')[1]);
const array = [];
for (let i = 0; i < binary.length; i++) { array.push(binary.charCodeAt(i)); }
return new Blob([new Uint8Array(array)], { type: 'image/jpeg' });
}
// =========================
// 11. Utility: Get media dimensions (Handles URLs and Files)
// =========================
function getMediaDimensions(source) {
return new Promise((resolve, reject) => {
const isVideo = (source instanceof File)
? (source.type.startsWith('video/'))
: (String(source).endsWith('.webm') || String(source).endsWith('.mp4'));
fetchImageAsBlob(source).then(blob => {
const blobUrl = URL.createObjectURL(blob);
if (isVideo) {
const video = document.createElement('video');
video.onloadedmetadata = () => { resolve({ width: video.videoWidth, height: video.videoHeight, type: 'video' }); URL.revokeObjectURL(blobUrl); };
video.onerror = () => { reject(new Error("Failed to load video " + (source.name || source))); URL.revokeObjectURL(blobUrl); };
video.src = blobUrl;
} else {
const img = new Image();
img.onload = () => { resolve({ width: img.naturalWidth, height: img.naturalHeight, type: 'image' }); URL.revokeObjectURL(blobUrl); };
img.onerror = () => { reject(new Error("Failed to load image " + (source.name || source))); URL.revokeObjectURL(blobUrl); };
img.src = blobUrl;
}
}).catch(reject);
});
}
// =========================
// 12. Options Menu
// =========================
function addOptionsMenu() {
const menu = document.createElement('div');
menu.className = 'chan-hv-options-menu';
const header = document.createElement('div');
header.className = 'chan-hv-menu-header';
header.textContent = '► Collage';
header.addEventListener('click', () => {
const content = menu.querySelector('.chan-hv-menu-content');
if (content.style.display === 'block') {
content.style.display = 'none'; header.textContent = '► Collage';
} else {
content.style.display = 'block'; header.textContent = '▼ Collage';
}
});
menu.appendChild(header);
const content = document.createElement('div');
content.className = 'chan-hv-menu-content';
content.style.display = 'none';
const reviewBtn = document.createElement('button');
reviewBtn.textContent = 'Review Highlights';
reviewBtn.addEventListener('click', showReviewHighlightsView);
const threadBtn = document.createElement('button');
threadBtn.textContent = 'View Thread Thumbnails';
threadBtn.addEventListener('click', showThreadThumbnailsView);
const customCollageBtn = document.createElement('button');
customCollageBtn.textContent = 'Custom Collage';
customCollageBtn.addEventListener('click', showCustomCollageView);
const clearBtn = document.createElement('button');
clearBtn.textContent = 'Clear All Selections';
clearBtn.addEventListener('click', () => {
if (!confirm("Are you sure you want to clear all highlighted posts?")) return;
document.querySelectorAll('.post.highlighted').forEach(post => {
post.classList.remove('highlighted');
const btn = post.querySelector('.highlight-btn');
if (btn) btn.style.background = 'rgba(255,255,0,0.7)';
});
highlightedImages = [];
saveHighlights();
});
content.appendChild(reviewBtn);
content.appendChild(threadBtn);
content.appendChild(customCollageBtn);
content.appendChild(clearBtn);
menu.appendChild(content);
document.body.appendChild(menu);
}
// =========================
// 13. Initialization
// =========================
function init() {
loadHighlights();
addHighlightButtons();
addOptionsMenu();
const observer = new MutationObserver(mutations => {
for (const mutation of mutations) {
if (mutation.type === 'childList' && mutation.addedNodes.length > 0) {
addHighlightButtons();
}
}
});
observer.observe(document.body, { childList: true, subtree: true });
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
} else {
init();
}
})();
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