2024-02-11 17:47:00 +01:00
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<!DOCTYPE html>
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2024-02-17 20:56:56 +01:00
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<html th:lang="${#locale.language}" th:lang-direction="#{language.direction}" th:language="${#locale.toString()}" xmlns:th="http://www.thymeleaf.org">
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2024-02-16 22:49:06 +01:00
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<head>
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<th:block th:insert="~{fragments/common :: head(title=#{adjustContrast.title}, header=#{adjustContrast.header})}"></th:block>
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</head>
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2024-02-11 17:47:00 +01:00
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<body>
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2024-02-16 22:49:06 +01:00
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<div id="page-container">
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<div id="content-wrap">
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<th:block th:insert="~{fragments/navbar.html :: navbar}"></th:block>
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<br /><br />
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<div class="container">
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<div class="row justify-content-center">
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<div class="col-md-12">
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2024-02-11 17:47:00 +01:00
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<div class="row justify-content-center">
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<div class="col-md-3">
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<div id="sliders-container" style="display:none;">
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<h4>
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<span th:text="#{adjustContrast.contrast}"></span> <span id="contrast-val">100</span>%
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</h4>
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<input type="range" min="0" max="200" value="100" id="contrast-slider" />
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<h4>
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<span th:text="#{adjustContrast.brightness}"></span> <span id="brightness-val">100</span>%
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</h4>
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<input type="range" min="0" max="200" value="100" id="brightness-slider" />
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<h4>
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<span th:text="#{adjustContrast.saturation}"></span> <span id="saturation-val">100</span>%
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</h4>
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<input type="range" min="0" max="200" value="100" id="saturation-slider" />
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</div>
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</div>
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<div class="col-md-7">
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<h2 th:text="#{adjustContrast.header}"></h2>
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<div class="col-md-8">
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<div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf', remoteCall='false')}"></div>
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</div>
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<br>
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<canvas id="contrast-pdf-canvas"></canvas>
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<button id="download-button" class="btn btn-primary" th:text="#{adjustContrast.download}"></button>
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</div>
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</div>
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<style>
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#flex-container {
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2024-02-16 22:49:06 +01:00
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display: flex;
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align-items: center;
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}
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#sliders-container {
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padding: 0 20px; /* Add some padding to separate sliders from canvas */
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}
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2024-02-11 17:47:00 +01:00
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</style>
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2024-02-16 22:49:06 +01:00
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<script src="pdfjs/pdf.js"></script>
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<script>
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var canvas = document.getElementById('contrast-pdf-canvas');
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var context = canvas.getContext('2d');
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var originalImageData = null;
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var allPages = [];
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var pdfDoc = null;
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var pdf = null; // This is the current PDF document
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async function renderPDFAndSaveOriginalImageData(file) {
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var fileReader = new FileReader();
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fileReader.onload = async function() {
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var data = new Uint8Array(this.result);
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pdfjsLib.GlobalWorkerOptions.workerSrc = 'pdfjs/pdf.worker.js'
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pdf = await pdfjsLib.getDocument({data: data}).promise;
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// Get the number of pages in the PDF
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var numPages = pdf.numPages;
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allPages = Array.from({length: numPages}, (_, i) => i + 1);
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// Create a new PDF document
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pdfDoc = await PDFLib.PDFDocument.create();
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// Render the first page in the viewer
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await renderPageAndAdjustImageProperties(1);
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document.getElementById("sliders-container").style.display = "block";
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};
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fileReader.readAsArrayBuffer(file);
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}
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// This function is now async and returns a promise
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function renderPageAndAdjustImageProperties(pageNum) {
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return new Promise(async function(resolve, reject) {
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var page = await pdf.getPage(pageNum);
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var scale = 1.5;
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var viewport = page.getViewport({ scale: scale });
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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var renderContext = {
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canvasContext: context,
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viewport: viewport
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};
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var renderTask = page.render(renderContext);
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renderTask.promise.then(function () {
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originalImageData = context.getImageData(0, 0, canvas.width, canvas.height);
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adjustImageProperties();
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resolve();
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});
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canvas.classList.add("fixed-shadow-canvas");
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});
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}
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function adjustImageProperties() {
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var contrast = parseFloat(document.getElementById('contrast-slider').value);
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var brightness = parseFloat(document.getElementById('brightness-slider').value);
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var saturation = parseFloat(document.getElementById('saturation-slider').value);
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contrast /= 100; // normalize to range [0, 2]
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brightness /= 100; // normalize to range [0, 2]
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saturation /= 100; // normalize to range [0, 2]
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if (originalImageData) {
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var newImageData = context.createImageData(originalImageData.width, originalImageData.height);
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newImageData.data.set(originalImageData.data);
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for(var i=0; i<newImageData.data.length; i+=4)
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{
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var r = newImageData.data[i];
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var g = newImageData.data[i+1];
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var b = newImageData.data[i+2];
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// Adjust contrast
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r = adjustContrastForPixel(r, contrast);
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g = adjustContrastForPixel(g, contrast);
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b = adjustContrastForPixel(b, contrast);
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// Adjust brightness
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r = adjustBrightnessForPixel(r, brightness);
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g = adjustBrightnessForPixel(g, brightness);
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b = adjustBrightnessForPixel(b, brightness);
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// Adjust saturation
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var rgb = adjustSaturationForPixel(r, g, b, saturation);
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newImageData.data[i] = rgb[0];
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newImageData.data[i+1] = rgb[1];
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newImageData.data[i+2] = rgb[2];
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}
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context.putImageData(newImageData, 0, 0);
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}
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}
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function rgbToHsl(r, g, b) {
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r /= 255, g /= 255, b /= 255;
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var max = Math.max(r, g, b), min = Math.min(r, g, b);
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var h, s, l = (max + min) / 2;
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if (max === min) {
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h = s = 0; // achromatic
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} else {
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var d = max - min;
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s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
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switch (max) {
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case r: h = (g - b) / d + (g < b ? 6 : 0); break;
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case g: h = (b - r) / d + 2; break;
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case b: h = (r - g) / d + 4; break;
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}
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h /= 6;
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}
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return [h, s, l];
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}
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function hslToRgb(h, s, l) {
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var r, g, b;
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if (s === 0) {
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r = g = b = l; // achromatic
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} else {
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var hue2rgb = function hue2rgb(p, q, t) {
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if (t < 0) t += 1;
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if (t > 1) t -= 1;
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if (t < 1 / 6) return p + (q - p) * 6 * t;
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if (t < 1 / 2) return q;
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if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
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return p;
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};
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var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
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var p = 2 * l - q;
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r = hue2rgb(p, q, h + 1 / 3);
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g = hue2rgb(p, q, h);
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b = hue2rgb(p, q, h - 1 / 3);
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}
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return [r * 255, g * 255, b * 255];
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}
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function adjustContrastForPixel(pixel, contrast) {
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// Normalize to range [-0.5, 0.5]
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var normalized = pixel / 255 - 0.5;
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// Apply contrast
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normalized *= contrast;
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// Denormalize back to [0, 255]
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return (normalized + 0.5) * 255;
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}
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function clamp(value, min, max) {
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return Math.min(Math.max(value, min), max);
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}
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function adjustSaturationForPixel(r, g, b, saturation) {
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var hsl = rgbToHsl(r, g, b);
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// Adjust saturation
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hsl[1] = clamp(hsl[1] * saturation, 0, 1);
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// Convert back to RGB
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var rgb = hslToRgb(hsl[0], hsl[1], hsl[2]);
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// Return adjusted RGB values
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return rgb;
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}
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function adjustBrightnessForPixel(pixel, brightness) {
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return Math.max(0, Math.min(255, pixel * brightness));
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}
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async function downloadPDF() {
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for (var i = 0; i < allPages.length; i++) {
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await renderPageAndAdjustImageProperties(allPages[i]);
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const pngImageBytes = canvas.toDataURL('image/png');
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const pngImage = await pdfDoc.embedPng(pngImageBytes);
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const pngDims = pngImage.scale(1);
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// Create a blank page matching the dimensions of the image
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const page = pdfDoc.addPage([pngDims.width, pngDims.height]);
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// Draw the PNG image
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page.drawImage(pngImage, {
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x: 0,
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y: 0,
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width: pngDims.width,
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height: pngDims.height
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});
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}
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// Serialize the PDFDocument to bytes (a Uint8Array)
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const pdfBytes = await pdfDoc.save();
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// Create a Blob
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const blob = new Blob([pdfBytes.buffer], {type: "application/pdf"});
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// Create download link
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const downloadLink = document.createElement('a');
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downloadLink.href = URL.createObjectURL(blob);
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downloadLink.download = "download.pdf";
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downloadLink.click();
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// After download, reset the viewer and clear stored data
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allPages = []; // Clear the pages
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originalImageData = null; // Clear the image data
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// Go back to page 1 and render it in the viewer
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if (pdf !== null) {
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renderPageAndAdjustImageProperties(1);
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}
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}
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// Event listeners
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document.getElementById('fileInput-input').addEventListener('change', function(e) {
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if (e.target.files.length > 0) {
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renderPDFAndSaveOriginalImageData(e.target.files[0]);
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}
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});
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document.getElementById('contrast-slider').addEventListener('input', function() {
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document.getElementById('contrast-val').textContent = this.value;
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adjustImageProperties();
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});
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document.getElementById('brightness-slider').addEventListener('input', function() {
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document.getElementById('brightness-val').textContent = this.value;
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adjustImageProperties();
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});
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document.getElementById('saturation-slider').addEventListener('input', function() {
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document.getElementById('saturation-val').textContent = this.value;
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adjustImageProperties();
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});
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document.getElementById('download-button').addEventListener('click', function() {
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downloadPDF();
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});
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</script>
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</div>
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</div>
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</div>
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</div>
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<th:block th:insert="~{fragments/footer.html :: footer}"></th:block>
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</div>
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2024-02-11 17:47:00 +01:00
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</body>
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</html>
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