Image-Editors/Custom Base64 Image Encoder.html at master · ciherrera20/Image-Editors · GitHub

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<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>Base 64 Image Encoder</title>
	</head>
	<body>
		<img id="image"></img>

		<div id="float">
			<label id="upload_image_label" for="upload_image" class="button">Upload Image
				<input id="upload_image" type="file" class="input"></input>
			</label>
			<span>|</span>
			<label id="slider_label" for="slider" class="button">Transparent
				<!--<input id="make_transparent" type="button" class="input" onclick="makeTransparent(mouse.selectedPixel)"></input>-->
				<br><input id="slider" type="range" min="0" max="255" value="255" class="slider"></input>
			</label>
			<span>|</span>
			<label id="to_base64_label" for="to_base64" class="button">To Base64
				<input id="to_base64" type="button" class="input" onclick="toBase64()"></input>
			</label>
			<span>|</span>
			<label id="download_png_label" for="download_png" class="button">Download PNG
				<input id="download_png" type="button" class="input" onclick="downloadPNG()"></input>
			</label>
			<br>
			<p>Selected Color: <canvas id="colorCanvas" width="0px" height="0px"></canvas></p>
		</div>
		<canvas id="canvas" width="0px" height="0px"></canvas>

		<style>
			.button
			{
				display: inline-block;
				border: 2px solid black;
				padding: 1px 10px 1px 10px;
				font-weight: bold;
				vertical-align: top;
				background: white;
				-webkit-transition: .2s;
				transition: background .2s;
			}

			.button:hover
			{
				background: #f2f2f2;
			}

			.slider
			{
				-webkit-appearance: none;
				appearance: none;
				width: 82px;
				height: 10px;
				background: #d3d3d3;
				outline: none;
				opacity: 0.7;
				-webkit-transition: .2s;
				transition: opacity .2s;
			}

			.slider:hover
			{
				opacity: 1;
			}

			.slider::-webkit-slider-thumb
			{
				-webkit-appearance: none;
				appearance: none;
				width: 10px;
				height: 10px;
				background: black;
				cursor: pointer;
			}

			p
			{
				padding: 1px 10px 1px 10px;
				font-weight: bold;
			}

			canvas
			{
				border: 1.5px dotted black;
				display: none;
			}

			#colorCanvas
			{
				position: relative;
				top: 1.5px;
			}

			.input, #image
			{
				display: none;
			}
		</style>

		<script>
			var input = document.getElementById('upload_image');
			var canvas = document.getElementById('canvas');
			var colorCanvas = document.getElementById('colorCanvas');
			var ogCanvas = document.createElement('canvas');
			var ctx = canvas.getContext('2d');
			var ctx2 = colorCanvas.getContext('2d');
			var ctx3 = ogCanvas.getContext('2d');
			var image = document.getElementById('image');
			var imgName;
			var mouse = {raw_x: 0, raw_y: 0, outside_x: 0, outside_y: 0, click_x: 0, click_y: 0, selectedPixel: undefined};
			var imgData;
			var alphaCoef = 1;
			ctx.imageSmoothingEnabled = false;

			function getMousePos(canvas, e)
			{
				let rect = canvas.getBoundingClientRect();
				return {x: e.clientX - rect.left, y: e.clientY - rect.top};
			}

			function fillColorCanvas(pixel)
			{
				if(pixel) {
					colorCanvas.style.display = 'inline';
					colorCanvas.width = '10';
					colorCanvas.height = '10';
					ctx2.fillStyle = 'rgba(' + pixel.join(', ') + ')';
					ctx2.fillRect(0, 0, colorCanvas.width, colorCanvas.height);
				} else {
					colorCanvas.style.display = 'none';
				}
			}

			document.getElementById('slider').oninput = function()
			{
				imgData = ctx3.getImageData(0, 0, canvas.width, canvas.height);
				let imgData2 = ctx.getImageData(0, 0, canvas.width, canvas.height);
				if(mouse.selectedPixel) {
					let pixel = mouse.selectedPixel;
					let alpha = Number(this.value);
					for(var a = 0; a < imgData.data.length; a += 4) {
						if(imgData.data[a] === pixel[0] && imgData.data[a + 1] === pixel[1] && imgData.data[a + 2] === pixel[2] && imgData.data[a + 3] === pixel[3]) {
							imgData2.data[a] = imgData.data[a];
							imgData2.data[a + 1] = imgData.data[a + 1];
							imgData2.data[a + 2] = imgData.data[a + 2];
							imgData2.data[a + 3] = alpha * alphaCoef;
						}
					}
					ctx.putImageData(imgData2, 0, 0);
				} else {
					//let alpha = Number(this.value);
					alphaCoef = Number(this.value) / 255;
					for(var a = 0; a < imgData.data.length; a += 4) {
						imgData2.data[a] = imgData.data[a];
						imgData2.data[a + 1] = imgData.data[a + 1];
						imgData2.data[a + 2] = imgData.data[a + 2];
						imgData2.data[a + 3] = imgData.data[a + 3] * alphaCoef;
					}
					ctx.putImageData(imgData2, 0, 0);
				}
			}

			function toBase64()
			{
				let base64Data = canvas.toDataURL();
				let imgWindow = window.open();
				imgWindow.document.write('<textarea id="data">' + base64Data + '</textarea><br>');
				imgWindow.document.write('<input type="button" value="Copy to Clipboard" onclick="document.getElementById(\'data\').select(); document.execCommand(\'copy\')"></input>');
			}

			function downloadPNG()
			{
				let base64Data = canvas.toDataURL();
				let png_data = atob(base64Data.split(',')[1]);
				let arrayBuffer = new ArrayBuffer(png_data.length);
				let view = new Uint8Array(arrayBuffer);
				for(var a in view)
					view[a] = png_data.charCodeAt(a) & 0xff;
				let blob = new Blob([arrayBuffer], {type: 'image/png'});
				let url = window.URL.createObjectURL(blob);
				let link = document.createElement('a');
				link.href = url;
				link.download = imgName;
				document.body.appendChild(link);
				link.click();
				document.body.removeChild(link);
			}

			input.addEventListener('change', function(e)
			{
				image.src = window.URL.createObjectURL(input.files[0]);
				imgName = input.files[0].name;
				image.onload = function()
				{
					canvas.width = image.width;
					canvas.height = image.height;
					canvas.style.display = 'block';
					ctx.drawImage(image, 0, 0);
					ogCanvas.width = image.width;
					ogCanvas.height = image.height;
					ctx3.drawImage(image, 0, 0);
				}
				input.value = '';
			});

			canvas.addEventListener('mousemove', function(e)
			{
				let mousePos = getMousePos(canvas, e);
				mouse.raw_x = mousePos.x;
				mouse.raw_y = mousePos.y;
				mouse.outside_x = e.clientX;
				mouse.outside_y = e.clientY;
			}, false);

			canvas.addEventListener('click', function(e)
			{
				mouse.click_x = mouse.raw_x;
				mouse.click_y = mouse.raw_y;
				mouse.selectedPixel = ctx3.getImageData(mouse.raw_x, mouse.raw_y, 1, 1).data;
				mouse.dummyPixel = ctx.getImageData(mouse.raw_x, mouse.raw_y, 1, 1).data;
				document.getElementById('slider').value = mouse.dummyPixel[3];
				fillColorCanvas(mouse.selectedPixel);
			}, false);

			document.addEventListener('click', function(e) {
				let rect = canvas.getBoundingClientRect();
				let contains = document.body.contains(e.target) && document.body !== e.target;
				if (!contains) {
					mouse.click_x = undefined;
					mouse.click_y = undefined;
					mouse.selectedPixel = undefined;
					mouse.dummyPixel = undefined;
					document.getElementById('slider').value = alphaCoef * 255;
					fillColorCanvas(mouse.selectedPixel);
				}
			}, false);
		</script>
	</body>
</html>