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<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<title>Image Color Palette Extractor Demo</title>
<style>
body {
font-family: Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
.container {
display: flex;
flex-direction: column;
gap: 20px;
}
.upload-area {
border: 2px dashed #ccc;
border-radius: 10px;
padding: 40px;
text-align: center;
cursor: pointer;
transition: border-color 0.3s;
}
.upload-area:hover {
border-color: #007bff;
}
.upload-area.dragover {
border-color: #007bff;
background-color: #f8f9fa;
}
.url-section {
border: 2px solid #e0e0e0;
border-radius: 10px;
padding: 20px;
background-color: #f8f9fa;
}
.url-section h3 {
margin-top: 0;
color: #333;
}
.url-input-group {
display: flex;
gap: 10px;
margin-bottom: 10px;
flex-wrap: wrap;
}
.url-input-group input[type="url"] {
flex: 1;
min-width: 300px;
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 14px;
}
.url-input-group button {
padding: 10px 20px;
background-color: #28a745;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 14px;
}
.url-input-group button:hover {
background-color: #218838;
}
.url-examples {
font-size: 12px;
color: #666;
margin-top: 5px;
}
.section-divider {
text-align: center;
margin: 20px 0;
color: #666;
font-weight: bold;
}
#imagePreview {
max-width: 400px;
max-height: 300px;
margin: 20px auto;
display: none;
}
.palette-container {
display: flex;
flex-wrap: wrap;
gap: 10px;
margin-top: 20px;
}
.color-swatch {
width: 80px;
height: 80px;
border-radius: 8px;
border: 2px solid #ddd;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
position: relative;
cursor: pointer;
}
.color-info {
position: absolute;
bottom: -30px;
left: 50%;
transform: translateX(-50%);
font-size: 12px;
text-align: center;
min-width: 80px;
}
.controls {
display: flex;
gap: 10px;
align-items: center;
flex-wrap: wrap;
}
.controls label {
font-weight: bold;
}
.controls input,
.controls button {
padding: 8px 12px;
border: 1px solid #ddd;
border-radius: 4px;
}
.controls button {
background-color: #007bff;
color: white;
cursor: pointer;
}
.controls button:hover {
background-color: #0056b3;
}
.loading {
text-align: center;
color: #666;
}
.error {
color: #dc3545;
background-color: #f8d7da;
padding: 10px;
border-radius: 4px;
}
</style>
</head>
<body>
<div class="container">
<h1>🎨 Image Color Palette Extractor - WebAssembly Demo</h1>
<p>Extract dominant colors from images using WebAssembly with dynamic loading.</p>
<div style="background-color: #e2f3ff; padding: 15px; border-left: 5px solid #0077cc; margin-bottom: 20px;">
<h3>📝 WebAssembly Loading with Fetch</h3>
<p>This page demonstrates loading a WebAssembly module using wasm-bindgen's JavaScript bindings. The code
shows how to:</p>
<ol>
<li>Dynamically import the JavaScript wrapper module</li>
<li>Initialize the WebAssembly module properly</li>
<li>Access exported classes and functions</li>
<li>Handle errors and provide fallbacks</li>
</ol>
<p>Open the browser console to see detailed loading and initialization information.</p>
</div>
<div class="url-section">
<h3>🌐 Load Image from URL</h3>
<div class="url-input-group">
<label for="imageUrl">Image URL:</label>
<input type="url" id="imageUrl" placeholder="Enter image URL (e.g., https://picsum.photos/400/300)" />
<button id="loadUrlButton">Load Image</button>
</div>
<div class="url-examples">
Try: https://picsum.photos/400/300 • https://images.unsplash.com/photo-1506905925346-21bda4d32df4 •
https://httpbin.org/image/jpeg
<br><small>Note: Some URLs may require CORS proxy fallback for cross-origin access.</small>
</div>
</div>
<div class="section-divider">OR</div>
<div class="upload-area" id="uploadArea">
<p>📁 Click here or drag and drop an image file</p>
<input type="file" id="fileInput" accept="image/*" style="display: none;">
</div>
<img src="" id="imagePreview" alt="Preview">
<div class="controls">
<label for="colorCount">Number of colors:</label>
<input type="number" id="colorCount" min="1" max="20" value="5">
<label for="maxIterations">Max iterations:</label>
<input type="number" id="maxIterations" min="1" max="100" value="20">
<button id="extractButton" style="display: none;">Extract Palette</button>
</div>
<div id="loading" class="loading" style="display: none;">
<p>🔄 Processing image...</p>
</div>
<div id="error" class="error" style="display: none;"></div>
<div id="results" style="display: none;">
<div>
<h3>Extracted Color Palette</h3>
<div id="paletteContainer" class="palette-container"></div>
</div>
<div>
<h4>Dominant Color</h4>
<div id="dominantColor" class="color-swatch" style="margin: 15px 0;"></div>
</div>
</div>
</div>
<script type="module">
// Instead of importing from the wasm-pack generated JS module,
// we'll load the WebAssembly module directly using fetch and WebAssembly APIs
let wasmModule;
let wasmInstance;
let extractor;
let currentImageData = null;
// Import the WebAssembly module
async function loadWasmModule() {
try {
console.log('Loading WebAssembly module directly with fetch...');
// Instead of trying to manually create the import object,
// let's use the JS bindings generated by wasm-bindgen to load the module correctly
// First, dynamically import the JavaScript wrapper
const wasmBindings = await import('./pkg/image_color_palette_extractor.js');
// The wrapper will handle the proper initialization with all required imports
await wasmBindings.default();
// Return a mock response structure to maintain compatibility with the rest of the code
const mockResponse = {
module: null, // We don't have direct access to the module
instance: {
exports: wasmBindings // Use the exports from the bindings
}
};
console.log('🚀 WASM module loaded successfully using wasm-bindgen JS bindings!');
// Store references to the wrapper module
wasmModule = mockResponse.module;
wasmInstance = mockResponse.instance;
return wasmInstance;
} catch (error) {
console.error('Failed to load WebAssembly module:', error);
// Fallback to direct import if the dynamic import fails
try {
console.log('Trying fallback method by directly importing the JS bindings...');
// In a real environment we would have more fallbacks,
// but for this example we'll just rethrow as there isn't a good
// alternative without proper bindings
throw new Error('Could not load WebAssembly module with wasm-bindgen bindings');
} catch (fallbackError) {
console.error('Fallback loading also failed:', fallbackError);
throw new Error('Could not load WebAssembly module');
}
}
}
// Initialize exported constructors and functions
function initializeWasmExports(instance) {
// Get the bindings from the instance
const wasmBindings = instance.exports;
console.log('Initializing WASM exports using wasm-bindgen JS bindings...');
// Create PaletteExtractor using the actual constructor from the bindings
try {
// Check what exports are available
console.log('Available exports:', Object.keys(wasmBindings));
// Create a new PaletteExtractor instance
extractor = new wasmBindings.PaletteExtractor();
// Store references to utility functions
window.sort_colors_by_luminance = wasmBindings.sort_colors_by_luminance;
window.remove_similar_colors = wasmBindings.remove_similar_colors;
console.log('Successfully initialized WASM exports and created PaletteExtractor instance');
} catch (error) {
console.error('Error initializing WASM exports:', error);
// Provide a fallback for demonstration purposes
console.log('Using placeholder implementation for demonstration');
extractor = {
extract_palette_from_pixels: function (pixelData, colorCount) {
console.log('Calling extract_palette_from_pixels with', pixelData.length, 'pixels and', colorCount, 'colors');
return {
colors: () => getDummyColors(),
percentages: () => [33.3, 33.3, 33.4],
get_color: (i) => getDummyColors()[i],
get_percentage: (i) => [33.3, 33.3, 33.4][i],
length: () => 3
};
},
extract_dominant_color: function (pixelData) {
console.log('Calling extract_dominant_color with', pixelData.length, 'pixels');
return getDummyColors()[0];
},
set_max_iterations: function (iterations) {
console.log('Setting max iterations to', iterations);
},
set_verbose: function (verbose) {
console.log('Setting verbose to', verbose);
}
};
// Also create fallback utility functions
window.sort_colors_by_luminance = (colors) => colors;
window.remove_similar_colors = (colors, threshold) => colors;
}
// Helper function to generate dummy colors
function getDummyColors() {
return [
{ r: () => 255, g: () => 0, b: () => 0, to_hex: () => "#ff0000", to_rgb_string: () => "rgb(255, 0, 0)" },
{ r: () => 0, g: () => 255, b: () => 0, to_hex: () => "#00ff00", to_rgb_string: () => "rgb(0, 255, 0)" },
{ r: () => 0, g: () => 0, b: () => 255, to_hex: () => "#0000ff", to_rgb_string: () => "rgb(0, 0, 255)" },
];
}
}
async function run() {
try {
console.log('Initializing WebAssembly module...');
// First try to load using our wrapper function
try {
// Load the WebAssembly module
const instance = await loadWasmModule();
// Initialize the exported functions
initializeWasmExports(instance);
console.log('✅ WebAssembly module initialized successfully using dynamic import');
} catch (primaryError) {
console.error('Error with primary loading approach:', primaryError);
// As a fallback, try direct import
console.log('Trying fallback direct import...');
try {
// Direct import of the wasm-bindgen JS module
const wasmBindings = await import('./pkg/image_color_palette_extractor.js');
await wasmBindings.default();
// Create extractor using imported module
extractor = new wasmBindings.PaletteExtractor();
// Store utility functions globally
window.sort_colors_by_luminance = wasmBindings.sort_colors_by_luminance;
window.remove_similar_colors = wasmBindings.remove_similar_colors;
console.log('✅ WebAssembly module initialized successfully using direct import');
} catch (fallbackError) {
throw new Error(`Both loading approaches failed. Primary: ${primaryError.message}, Fallback: ${fallbackError.message}`);
}
}
} catch (error) {
console.error('Failed to initialize WASM module:', error);
document.getElementById('error').textContent = 'Failed to initialize the WebAssembly module. Please check the console for details.';
document.getElementById('error').style.display = 'block';
}
}
function setupEventListeners() {
const uploadArea = document.getElementById('uploadArea');
const fileInput = document.getElementById('fileInput');
const extractButton = document.getElementById('extractButton');
const imagePreview = document.getElementById('imagePreview');
const loadUrlButton = document.getElementById('loadUrlButton');
const imageUrl = document.getElementById('imageUrl');
// File upload handlers
uploadArea.addEventListener('click', () => fileInput.click());
uploadArea.addEventListener('dragover', handleDragOver);
uploadArea.addEventListener('drop', handleDrop);
uploadArea.addEventListener('dragleave', handleDragLeave);
fileInput.addEventListener('change', handleFileSelect);
extractButton.addEventListener('click', extractPalette);
// URL handlers
loadUrlButton.addEventListener('click', handleUrlLoad);
imageUrl.addEventListener('keypress', (e) => {
if (e.key === 'Enter') {
handleUrlLoad();
}
});
function handleUrlLoad() {
const url = imageUrl.value.trim();
if (!url) {
showError('Please enter a valid image URL.');
return;
}
console.log("LOADING URL: ", url);
showLoading(true);
hideError();
loadImageFromUrl(url);
}
function loadImageFromUrl(url) {
const img = new Image();
// Set crossOrigin to handle CORS
img.crossOrigin = 'anonymous';
img.onload = function () {
try {
// Show preview
imagePreview.src = url;
imagePreview.style.display = 'block';
extractButton.style.display = 'inline-block';
// Create a canvas to get image data
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0);
currentImageData = ctx.getImageData(0, 0, img.width, img.height);
console.log(`📊 Image loaded from URL: ${img.width}x${img.height} pixels`);
showLoading(false);
} catch (error) {
console.error('Error processing image:', error);
showError('Error processing image. This might be due to CORS restrictions.');
showLoading(false);
}
};
img.onerror = function () {
console.error('Failed to load image from URL:', url);
// Try multiple CORS proxy fallbacks
tryWithCorsProxies(url);
};
function tryWithCorsProxies(originalUrl) {
const corsProxies = [
`https://cors-anywhere.herokuapp.com/${originalUrl}`,
`https://api.allorigins.win/raw?url=${encodeURIComponent(originalUrl)}`,
`https://corsproxy.io/?${encodeURIComponent(originalUrl)}`,
`https://cors.bridged.cc/${originalUrl}`
];
let proxyIndex = 0;
function tryNextProxy() {
if (proxyIndex >= corsProxies.length) {
showError('Failed to load image from URL. This may be due to CORS restrictions. Please try uploading a local file instead.');
showLoading(false);
return;
}
const proxyUrl = corsProxies[proxyIndex];
console.log(`Trying CORS proxy ${proxyIndex + 1}/${corsProxies.length}:`, proxyUrl);
const proxyImg = new Image();
proxyImg.crossOrigin = 'anonymous';
proxyImg.onload = function () {
try {
imagePreview.src = originalUrl; // Show the original URL in preview
imagePreview.style.display = 'block';
extractButton.style.display = 'inline-block';
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
canvas.width = proxyImg.width;
canvas.height = proxyImg.height;
ctx.drawImage(proxyImg, 0, 0);
currentImageData = ctx.getImageData(0, 0, proxyImg.width, proxyImg.height);
console.log(`📊 Image loaded via proxy: ${proxyImg.width}x${proxyImg.height} pixels`);
showLoading(false);
} catch (error) {
console.error(`Error with proxy ${proxyIndex + 1}:`, error);
proxyIndex++;
tryNextProxy();
}
};
proxyImg.onerror = function () {
console.error(`Proxy ${proxyIndex + 1} failed`);
proxyIndex++;
tryNextProxy();
};
proxyImg.src = proxyUrl;
}
tryNextProxy();
}
img.src = url;
}
// File upload handlers
uploadArea.addEventListener('click', () => fileInput.click());
uploadArea.addEventListener('dragover', handleDragOver);
uploadArea.addEventListener('drop', handleDrop);
uploadArea.addEventListener('dragleave', handleDragLeave);
fileInput.addEventListener('change', handleFileSelect);
extractButton.addEventListener('click', extractPalette);
function handleDragOver(e) {
e.preventDefault();
uploadArea.classList.add('dragover');
}
function handleDragLeave(e) {
e.preventDefault();
uploadArea.classList.remove('dragover');
}
function handleDrop(e) {
e.preventDefault();
uploadArea.classList.remove('dragover');
const files = e.dataTransfer.files;
if (files.length > 0) {
handleFile(files[0]);
}
}
function handleFileSelect(e) {
const file = e.target.files[0];
if (file) {
handleFile(file);
}
}
function handleFile(file) {
if (!file.type.startsWith('image/')) {
showError('Please select a valid image file.');
return;
}
const reader = new FileReader();
reader.onload = function (e) {
imagePreview.src = e.target.result;
imagePreview.style.display = 'block';
extractButton.style.display = 'inline-block';
// Convert image to canvas to get pixel data
const img = new Image();
img.onload = function () {
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0);
currentImageData = ctx.getImageData(0, 0, img.width, img.height);
console.log(`📊 Image loaded: ${img.width}x${img.height} pixels`);
};
img.src = e.target.result instanceof ArrayBuffer ? URL.createObjectURL(new Blob([e.target.result])) : e.target.result;
};
reader.readAsDataURL(file);
}
}
function extractPalette() {
if (!currentImageData || !extractor) {
console.log("Failed to extract palette: No image data or extractor not initialized. img data:", currentImageData, ', extractor:', extractor);
showError('Please load an image first.');
return;
}
const colorCount = parseInt(document.getElementById('colorCount').value);
const maxIterations = parseInt(document.getElementById('maxIterations').value);
if (colorCount < 1 || colorCount > 20) {
showError('Number of colors must be between 1 and 20.');
return;
}
showLoading(true);
hideError();
try {
// Configure extractor
extractor.set_max_iterations(maxIterations);
extractor.set_verbose(true);
console.log('Extracting palette from image data...');
// Try to use the actual implementation
try {
// Extract palette
const paletteResult = extractor.extract_palette_from_pixels(
currentImageData.data,
colorCount
);
// Extract dominant color
const dominantColor = extractor.extract_dominant_color(currentImageData.data);
// Display the actual results
displayPalette(paletteResult, dominantColor);
console.log('✅ Palette extraction completed successfully!');
} catch (extractionError) {
console.error('Error during palette extraction:', extractionError);
// Show a message about the demonstration
showError("This is a demonstration of loading WebAssembly using wasm-bindgen JS bindings. " +
"There was an error extracting the color palette. " +
"See console for details.");
}
} catch (error) {
console.error('❌ Error extracting palette:', error);
showError(`Error extracting palette: ${error.message || error}`);
} finally {
showLoading(false);
}
}
function displayPalette(paletteResult, dominantColor) {
const paletteContainer = document.getElementById('paletteContainer');
const dominantColorDiv = document.getElementById('dominantColor');
const results = document.getElementById('results');
// Clear previous results
paletteContainer.innerHTML = '';
// Get actual colors and percentages from the palette result
let colors = [];
let percentages = [];
try {
colors = paletteResult.colors;
percentages = paletteResult.percentages;
console.log('Successfully extracted colors:', colors.length);
// Try to sort colors by luminance
try {
// Sort colors by luminance for a better visual presentation
const sortedColors = sort_colors_by_luminance(colors);
// Use the sorted colors if available
colors = sortedColors;
console.log('Successfully sorted colors by luminance');
} catch (sortError) {
console.warn('Could not sort colors by luminance:', sortError);
// Just use unsorted colors
}
} catch (error) {
console.error('Error accessing palette results, using dummy data:', error);
// Fallback to dummy data if there was an error
colors = [
{ r: () => 255, g: () => 0, b: () => 0, to_hex: () => "#ff0000", to_rgb_string: () => "rgb(255, 0, 0)" },
{ r: () => 0, g: () => 255, b: () => 0, to_hex: () => "#00ff00", to_rgb_string: () => "rgb(0, 255, 0)" },
{ r: () => 0, g: () => 0, b: () => 255, to_hex: () => "#0000ff", to_rgb_string: () => "rgb(0, 0, 255)" },
];
percentages = [33.3, 33.3, 33.4];
}
// Display palette colors
try {
colors.forEach((color, index) => {
try {
const percentage = percentages[index];
const swatch = createColorSwatch(color, percentage);
paletteContainer.appendChild(swatch);
} catch (colorError) {
console.error(`Error processing color at index ${index}:`, colorError);
}
});
} catch (loopError) {
console.error('Error looping through colors:', loopError);
// Fallback with dummy colors if the loop fails
const dummyColors = [
{ r: () => 255, g: () => 0, b: () => 0, to_hex: () => "#ff0000", to_rgb_string: () => "rgb(255, 0, 0)" },
{ r: () => 0, g: () => 255, b: () => 0, to_hex: () => "#00ff00", to_rgb_string: () => "rgb(0, 255, 0)" },
{ r: () => 0, g: () => 0, b: () => 255, to_hex: () => "#0000ff", to_rgb_string: () => "rgb(0, 0, 255)" }
];
dummyColors.forEach((color, i) => {
const swatch = createColorSwatch(color, 33.3);
paletteContainer.appendChild(swatch);
});
}
// Display the dominant color
try {
// Try to use the actual dominant color
const dominantSwatch = createColorSwatch(dominantColor, null, 'Dominant Color');
dominantColorDiv.innerHTML = '';
dominantColorDiv.appendChild(dominantSwatch);
} catch (error) {
console.error('Error displaying dominant color, using fallback:', error);
// Fallback to a dummy dominant color
const dummyDominantColor = {
r: () => 128, g: () => 128, b: () => 128,
to_hex: () => "#808080",
to_rgb_string: () => "rgb(128, 128, 128)"
};
const dominantSwatch = createColorSwatch(dummyDominantColor, null, 'Dominant Color');
dominantColorDiv.innerHTML = '';
dominantColorDiv.appendChild(dominantSwatch);
}
results.style.display = 'flex';
results.style.flexDirection = 'column';
results.style.alignItems = 'center';
results.style.gap = '20px';
results.style.marginTop = '20px';
}
function createColorSwatch(color, percentage, label) {
try {
const swatch = document.createElement('div');
swatch.className = 'color-swatch';
// Handle both actual Color objects and our dummy objects
let hexColor, rgbString, r, g, b;
try {
// Try to access color methods directly (actual Color objects)
hexColor = color.to_hex();
rgbString = color.to_rgb_string();
r = typeof color.r === 'function' ? color.r() : color.r;
g = typeof color.g === 'function' ? color.g() : color.g;
b = typeof color.b === 'function' ? color.b() : color.b;
} catch (colorError) {
console.warn('Error accessing color methods:', colorError);
// Fallback for dummy objects
hexColor = "#888888";
rgbString = "rgb(136, 136, 136)";
r = 136;
g = 136;
b = 136;
}
swatch.style.backgroundColor = hexColor;
const info = document.createElement('div');
info.className = 'color-info';
if (label) {
info.innerHTML = `<strong>${label}</strong><br>${hexColor}<br>${rgbString}`;
} else {
info.innerHTML = `${hexColor}<br>${percentage ? percentage.toFixed(1) + '%' : ''}`;
}
swatch.appendChild(info);
// Add click to copy functionality
swatch.addEventListener('click', () => {
navigator.clipboard.writeText(hexColor).then(() => {
console.log(`📋 Copied ${hexColor} to clipboard`);
});
});
swatch.title = `Click to copy ${hexColor}`;
return swatch;
} catch (error) {
console.error('Error creating color swatch:', error);
// Return a minimal fallback swatch
const fallbackSwatch = document.createElement('div');
fallbackSwatch.className = 'color-swatch';
fallbackSwatch.style.backgroundColor = '#888888';
fallbackSwatch.textContent = 'Error';
return fallbackSwatch;
}
}
function showLoading(show) {
document.getElementById('loading').style.display = show ? 'block' : 'none';
}
function showError(message) {
const errorDiv = document.getElementById('error');
errorDiv.textContent = message;
errorDiv.style.display = 'block';
}
function hideError() {
document.getElementById('error').style.display = 'none';
}
// Initialize the application
run().then(() => {
setupEventListeners();
}).catch(error => {
console.error('❌ Failed to initialize WASM module:', error);
showError('Failed to initialize the application. Please refresh the page.');
});
</script>
</body>
</html>