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<!--
"image2cpp"
Original utility by:
https://jaspervanloenen.com
This is the 2nd revision of the modified version by:
https://wiredolphin.net
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>image2cpp</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
body{
font-family: arial;
}
.wrapper {
display: flex;
flex-direction: column;
margin: auto;
width: 900px;
}
.section {
margin: 10px 0;
}
.bottom-divider {
border-bottom: 2px solid #000000;
padding-bottom: 20px;
}
.sub-section {
clear: both;
margin-bottom: 1px;
}
.section,
.sub-section {
width: 100%;
}
.column {
float: left;
}
.column-center {
min-width: 160px;
text-align: center;
}
.column-right {
float: right;
}
.sub-section-title {
margin: 0 0 10px;
}
p {
margin: 20px 0;
}
.table {
display: table;
margin: 10px 0 0;
width: 100%;
}
.table-row {
display: table-row;
width: 100%;
}
.table-cell {
display: table-cell;
padding: 5px 0;
}
.table-cell:first-child {
width: 30%;
}
.table-cell:last-child {
width: 70%;
}
.table-cell:first-child label {
font-weight: bold;
}
.table-cell:last-child label {
margin-right: 10px;
}
.nested-table {
margin: 0;
}
.nested-table .table-cell {
color: #666;
font-size: .9em;
width: 200px;
}
#format-caption-container div {
color: #505050;
display: none;
font-size: .9em;
line-height: 1.4em;
padding: 10px 0 15px;
width: 100%;
}
.byte-input {
min-height: 160px;
min-width: 360px;
}
.code-output {
height: 200px;
width: 100%;
}
.note {
color: #666666;
font-size: .9em;
line-height: 1.4em;
margin: 3px 0;
}
.file-input-entry {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
}
button,
input[type="file"] {
background: #00CB99;
border-radius: 3px;
border: none;
color: #fff;
font-size: .9em;
font-weight: bold;
margin: 10px 0;
padding: 4px 8px;
}
input[type="file"] {
font-size: 1.0em;
padding: 6px 20px;
}
.generate-button {
margin: 40px 0 20px;
}
.remove-button {
margin: 0 0 0 10px;
padding: 1px 4px;
}
.file-info {
color: #505050;
font-size: .7em;
margin-left: 20px;
max-width: 300px;
white-space: pre;
}
.size-input{
width: 45px;
}
.glyph-input {
width: 80px;
margin-left: 10px;
}
#image-size-settings {
list-style-type: none;
}
#image-size-settings li {
margin: 4px 0;
}
#images-canvas-container canvas {
border: 3px solid #88DAC5;
margin: 10px 15px;
}
#images-canvas-container {
align-items: flex-start;
display: flex;
flex-wrap: wrap;
}
#arduino-identifier,
#adafruit-gfx-settings,
#all-same-size {
display: none;
}
.msg {
font-size: 1.2em;
}
.error-msg {
color: #ff0000;
display: none;
}
h1{
padding: 10px;
color: white;
background-color: #00cb99;
}
</style>
</head>
<body>
<div class="wrapper">
<section class="section">
<h1>image2cpp</h1>
</section>
<section class="section bottom-divider">
<section class="sub-section">
<div class="column" id="file-input-column">
<h2 class="sub-section-title">1. Select image</h2>
<input type="file" id="file-input" name="file-input" multiple/><br />
</div>
<div class="column column-center">
<h2 class="sub-section-title">or</h2>
</div>
<div class="column column-right">
<h2 class="sub-section-title">1. Paste byte array</h2>
<textarea id="byte-input" class="byte-input"></textarea><br />
<div class="text-input-size">
<input type="number" min="0" id="text-input-width" class="size-input" value="128" /> x
<input type="number" min="0" id="text-input-height" class="size-input" value="64" /> px
</div>
<button onclick="handleTextInput('horizontal')">Read as horizontal</button>
<button onclick="handleTextInput('vertical')">Read as vertical</button>
</div>
</section>
</section>
<section class="section bottom-divider">
<h2>2. Image Settings</h2>
<section class="sub-section">
<div class="table">
<div class="table-row">
<div class="table-cell"><label>Canvas size(s): </label></div>
<div class="table-cell">
<ul id="image-size-settings"></ul>
<div id="only-images-file-error" class="msg error-msg">Only images file type are allowed</div>
<div id="no-file-selected" class="msg">No files selected</div>
<button id="all-same-size">all same size</button>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label>Background color:</label></div>
<div class="table-cell">
<input id="backgroundColorWhite" type="radio" name="backgroundColor" value="white" checked="checked" onchange="updateRadio('backgroundColor')"/>
<label for="backgroundColorWhite" class="smallLabel">White</label>
<input id="backgroundColorBlack" type="radio" name="backgroundColor" value="black" onchange="updateRadio('backgroundColor')"/>
<label for="backgroundColorBlack" class="smallLabel">Black</label>
<input id="backgroundColorTransparent" type="radio" name="backgroundColor" value="transparent" onchange="updateRadio('backgroundColor')"/>
<label for="backgroundColorTransparent" class="smallLabel">Transparent</label>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label for="invertColors">Invert image colors</label></div>
<div class="table-cell">
<input id="invertColors" type="checkbox" onchange="updateBoolean('invertColors')" />
</div>
</div>
<div class="table-row">
<div class="table-cell"><label>Brightness / alpha threshold: </label></div>
<div class="table-cell">
<input id="threshold" class="size-input" type="number" min="0" max="255" name="threshold" oninput="updateInteger('threshold')" value="128"/>
<div class="note">
<i>0 - 255; if the brightness of a pixel is above the given level the pixel becomes white, otherwise they become black. When using alpha, opaque and transparent are used instead.</i></div>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label for="scale">Scaling</label></div>
<div class="table-cell">
<select id="scale" name="scale" onchange="updateInteger('scale')">
<option value="1">original size</option>
<option value="2">scale to fit, keeping proportions</option>
<option value="3">stretch to fill canvas</option>
<option value="4">stretch to fill canvas horizontally</option>
<option value="5">stretch to fill canvas vertically</option>
</select>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label>Center:</label></div>
<div class="table-cell">
<input id="centerHorizontally" type="checkbox" onchange="updateBoolean('centerHorizontally')" />
<label for="centerHorizontally">horizontally</label>
<input id="centerVertically" type="checkbox" onchange="updateBoolean('centerVertically')" />
<label for="centerVertically">vertically</label>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label for="invertColors">Rotate image:</label></div>
<div class="table-cell">
<input id="rotate180" type="checkbox" onchange="updateBoolean('rotate180')" />
<label for="rotate180">rotate 180 degrees</label>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label>Flip:</label></div>
<div class="table-cell">
<input id="flipHorizontally" type="checkbox" onchange="updateBoolean('flipHorizontally')" />
<label for="flipHorizontally">horizontally</label>
<input id="flipVertically" type="checkbox" onchange="updateBoolean('flipVertically')" />
<label for="flipVertically">vertically</label>
</div>
</div>
</div>
<div class="note">
<i>Note: centering the image only works when using a canvas larger than the original image.</i>
</div>
</section>
</section>
<section class="section bottom-divider">
<h2>3. Preview</h2>
<section class="sub-section">
<div id="images-canvas-container"></div>
</section>
</section>
<section class="section">
<h2>4. Output</h2>
<section class="sub-section">
<div class="table">
<div class="table-row">
<div class="table-cell"><label for="outputFormat">Code output format</label></div>
<div class="table-cell">
<select id="outputFormat" name="outputFormat" onchange="updateOutputFormat(this)">
<option value="plain">plain bytes</option>
<option value="arduino">Arduino code</option>
<option value="arduino_single">Arduino code, single bitmap</option>
<option value="adafruit_gfx">Adafruit GFXbitmapFont</option>
</select>
<div id="format-caption-container">
<div data-caption="arduino">
Adds some extra Arduino code around the output for easy copy-paste into
<a href="https://github.com/javl/image2cpp/blob/master/oled_example/oled_example.ino" target="_blank">this example</a>.
If multiple images are loaded, generates a byte array for each and appends a counter to the identifier.
</div>
<div data-caption="arduino_single">
Adds some extra Arduino code around the output for easy copy-paste.
If multiple images are loaded, generates a single byte array.
</div>
<div data-caption="adafruit_gfx">
Creates a <code>GFXbitmapFont</code> formatted ouput. Used by a modified version of the Adafruit GFX library.
GitHub project and example <a href="https://github.com/wiredolphin/Adafruit-GFX-Library/tree/bitmap-font" target="_blank">here</a>.
<br />
<i>First ASCII character</i> value is used only if a glyph identifier of length equal to 1 is not provided for each image. The value itself will be incremented by 1 for each glyph.
</div>
</div>
<div id="extra-settings-container">
<div id="adafruit-gfx-settings" class="table nested-table">
<div class="table-row">
<div class="table-cell"><label>First ASCII character (dec):</label></div>
<div class="table-cell">
<input id="first-ascii-char" class="text-input" type="text" name="first-ascii-char" onchange="" value="48"/>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label>x advance:</label></div>
<div class="table-cell">
<input id="x-advance" class="text-input" type="text" name="x-advance" onchange="" value="0"/>
</div>
</div>
</div>
<div id="arduino-identifier" class="table nested-table">
<div class="table-row">
<div class="table-cell"><label>Identifier/Prefix:</label></div>
<div class="table-cell">
<input id="identifier" class="text-input" type="text" name="identifier" onchange="" value="epd_bitmap_"/>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label>Draw mode:</label></div>
<div class="table-cell">
<select id="drawMode" name="drawMode" onchange="updateDrawMode(this)">
<option value="horizontal1bit">Horizontal - 1 bit per pixel</option>
<option value="vertical1bit">Vertical - 1 bit per pixel</option>
<option value="horizontal565">Horizontal - 2 bytes per pixel (565)</option>
<option value="horizontalAlpha">Horizontal - 1 bit per pixel alpha map</option>
<option value="horizontal888">Horizontal - 3 bytes per pixel (rgb888</option>
</select>
</div>
</div>
</div>
<div id="note1bit">
<div class="note">
<i>If your image looks all messed up on your display, like the image below, try using a different mode.</i>
</div>
<img class="inlineImg"
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"
width="150" height="64" alt="" />
</div>
</section>
<section class="sub-section">
<button type="button" class="generate-button" onclick="outputString()">Generate code</button>
<button type="button" id = "copy-button" onclick="copyOutput()">Copy Output</button>
<textarea id="code-output" class="code-output"></textarea>
</section>
</section>
</div>
<script type="text/javascript">
document.getElementById("copy-button").disabled = true;
var __output;
var ConversionFunctions = {
// Output the image as a string for horizontally drawing displays
horizontal1bit: function (data, canvasWidth, canvasHeight){
var output_string = "";
var output_index = 0;
var byteIndex = 7;
var number = 0;
// format is RGBA, so move 4 steps per pixel
for(var index = 0; index < data.length; index += 4){
// Get the average of the RGB (we ignore A)
var avg = (data[index] + data[index + 1] + data[index + 2]) / 3;
if(avg > settings["threshold"]){
number += Math.pow(2, byteIndex);
}
byteIndex--;
// if this was the last pixel of a row or the last pixel of the
// image, fill up the rest of our byte with zeros so it always contains 8 bits
if ((index != 0 && (((index/4)+1)%(canvasWidth)) == 0 ) || (index == data.length-4)) {
// for(var i=byteIndex;i>-1;i--){
// number += Math.pow(2, i);
// }
byteIndex = -1;
}
// When we have the complete 8 bits, combine them into a hex value
if(byteIndex < 0){
var byteSet = number.toString(16);
if(byteSet.length == 1){ byteSet = "0"+byteSet; }
var b = "0x"+byteSet;
output_string += b + ", ";
output_index++;
if(output_index >= 16){
output_string += "\n";
output_index = 0;
}
number = 0;
byteIndex = 7;
}
}
return output_string;
},
// Output the image as a string for vertically drawing displays
vertical1bit: function (data, canvasWidth, canvasHeight){
var output_string = "";
var output_index = 0;
for(var p=0; p < Math.ceil(settings["screenHeight"] / 8); p++){
for(var x = 0; x < settings["screenWidth"]; x++){
var byteIndex = 7;
var number = 0;
for (var y = 7; y >= 0; y--){
var index = ((p*8)+y)*(settings["screenWidth"]*4)+x*4;
var avg = (data[index] + data[index +1] + data[index +2]) / 3;
if (avg > settings["threshold"]){
number += Math.pow(2, byteIndex);
}
byteIndex--;
}
var byteSet = number.toString(16);
if (byteSet.length == 1){ byteSet = "0"+byteSet; }
var b = "0x"+byteSet.toString(16);
output_string += b + ", ";
output_index++;
if(output_index >= 16){
output_string += "\n";
output_index = 0;
}
}
}
return output_string;
},
// Output the image as a string for 565 displays (horizontally)
horizontal565: function (data, canvasWidth, canvasHeight){
var output_string = "";
var output_index = 0;
// format is RGBA, so move 4 steps per pixel
for(var index = 0; index < data.length; index += 4){
// Get the RGB values
var r = data[index];
var g = data[index + 1];
var b = data[index + 2];
// calculate the 565 color value
var rgb = ((r & 0b11111000) << 8) | ((g & 0b11111100) << 3) | ((b & 0b11111000) >> 3);
// Split up the color value in two bytes
var firstByte = (rgb >> 8) & 0xff;
var secondByte = rgb & 0xff;
var byteSet = rgb.toString(16);
while(byteSet.length < 4){ byteSet = "0" + byteSet; }
output_string += "0x" + byteSet + ", ";
// add newlines every 16 bytes
output_index++;
if(output_index >= 16){
output_string += "\n";
output_index = 0;
}
}
return output_string;
},
// Output the image as a string for rgb888 displays (horizontally)
horizontal888: function (data, canvasWidth, canvasHeight){
var output_string = "";
var output_index = 0;
// format is RGBA, so move 4 steps per pixel
for(var index = 0; index < data.length; index += 4){
// Get the RGB values
var r = data[index];
var g = data[index + 1];
var b = data[index + 2];
// calculate the 565 color value
var rgb = (r << 16) | (g << 8) | (b);
// Split up the color value in two bytes
var firstByte = (rgb >> 8) & 0xff;
var secondByte = rgb & 0xff;
var byteSet = rgb.toString(16);
while(byteSet.length < 8){ byteSet = "0" + byteSet; }
output_string += "0x" + byteSet + ", ";
// add newlines every 16 bytes
output_index++;
if(output_index >= canvasWidth){
output_string += "\n";
output_index = 0;
}
}
return output_string;
},
// Output the alpha mask as a string for horizontally drawing displays
horizontalAlpha: function (data, canvasWidth, canvasHeight){
var output_string = "";
var output_index = 0;
var byteIndex = 7;
var number = 0;
// format is RGBA, so move 4 steps per pixel
for(var index = 0; index < data.length; index += 4){
// Get alpha part of the image data
var alpha = data[index + 3];
if(alpha > settings["threshold"]){
number += Math.pow(2, byteIndex);
}
byteIndex--;
// if this was the last pixel of a row or the last pixel of the
// image, fill up the rest of our byte with zeros so it always contains 8 bits
if ((index != 0 && (((index/4)+1)%(canvasWidth)) == 0 ) || (index == data.length-4)) {
byteIndex = -1;
}
// When we have the complete 8 bits, combine them into a hex value
if(byteIndex < 0){
var byteSet = number.toString(16);
if(byteSet.length == 1){ byteSet = "0"+byteSet; }
var b = "0x"+byteSet;
output_string += b + ", ";
output_index++;
if(output_index >= 16){
output_string += "\n";
output_index = 0;
}
number = 0;
byteIndex = 7;
}
}
return output_string;
}
};
// An images collection with helper methods
function Images() {
var collection = [];
this.push = function(img, canvas, glyph) {
collection.push({ "img" : img, "canvas" : canvas, "glyph" : glyph });
};
this.remove = function(image) {
var i = collection.indexOf(image);
if(i != -1) collection.splice(i, 1);
};
this.each = function(f) { collection.forEach(f); };
this.length = function() { return collection.length; };
this.first = function() { return collection[0]; };
this.last = function() { return collection[collection.length - 1]; };
this.getByIndex = function(index) { return collection[index]; };
this.setByIndex = function(index, img) { collection[index] = img; };
this.get = function(img) {
if(img) {
for(var i = 0; i < collection.length; i++) {
if(collection[i].img == img) {
return collection[i];
}
}
}
return collection;
};
return this;
}
// Add events to the file input button
var fileInput = document.getElementById("file-input");
fileInput.addEventListener("click", function(){this.value = null;}, false);
fileInput.addEventListener("change", handleImageSelection, false);
var fileInputColumn = document.getElementById("file-input-column");
// Filetypes accepted by the file picker
var fileTypes = ["jpg", "jpeg", "png", "bmp", "gif", "svg"];
// The canvas we will draw on
var canvasContainer = document.getElementById("images-canvas-container");
// multiple images settings container
var imageSizeSettings = document.getElementById("image-size-settings");
// all images same size button
var allSameSizeButton = document.getElementById("all-same-size");
// error message
var onlyImagesFileError = document.getElementById("only-images-file-error");
// initial message
var noFileSelected = document.getElementById("no-file-selected");
// The variable to hold our images. Global so we can easily reuse it when the
// user updates the settings (change canvas size, scale, invert, etc)
var images = new Images();
// A bunch of settings used when converting
var settings = {
screenWidth: 128,
screenHeight: 64,
scaleToFit: true,
preserveRatio: true,
centerHorizontally: false,
centerVertically: false,
flipHorizontally: false,
flipVertically: false,
backgroundColor: "white",
scale: "1",
drawMode: "horizontal",
threshold: 128,
outputFormat: "plain",
invertColors: false,
rotate180: false,
conversionFunction: ConversionFunctions.horizontal1bit
};
// Variable name, when "arduino code" is required
var identifier = "myBitmap";
function update() {
images.each(function(image) { place_image(image); });
}
// Easy way to update settings controlled by a textfield
function updateInteger(fieldName){
settings[fieldName] = document.getElementById(fieldName).value;
update();
}
// Easy way to update settings controlled by a checkbox
function updateBoolean(fieldName){
settings[fieldName] = document.getElementById(fieldName).checked;
update();
}
// Easy way to update settings controlled by a radiobutton
function updateRadio(fieldName){
var radioGroup = document.getElementsByName(fieldName);
for (var i = 0; i < radioGroup.length; i++) {
if (radioGroup[i].checked) {
settings[fieldName] = radioGroup[i].value;
}
}
update();
}
// Updates Arduino code check-box
function updateOutputFormat(elm) {
var caption = document.getElementById("format-caption-container");
var adafruitGfx = document.getElementById("adafruit-gfx-settings");
var arduino = document.getElementById("arduino-identifier");
for(var i = 0; i < caption.children.length; i++) {
caption.children[i].style.display = "none";
}
caption = document.querySelector("div[data-caption='" + elm.value + "']");
if(caption) caption.style.display = "block";
elm.value != "plain" ? arduino.style.display = "block" : arduino.style.display = "none";
elm.value == "adafruit_gfx" ? adafruitGfx.style.display = "block" : adafruitGfx.style.display = "none";
settings["outputFormat"] = elm.value;
}
function updateDrawMode(elm) {
var note = document.getElementById("note1bit");
if(elm.value == "horizontal1bit" || elm.value == "vertical1bit") {
note.style.display = "block";
} else {
note.style.display = "none";
}
var conversionFunction = ConversionFunctions[elm.value];
if(conversionFunction) {
settings.conversionFunction = conversionFunction;
}
}
// Make the canvas black and white
function blackAndWhite(canvas, ctx){
var imageData = ctx.getImageData(0,0,canvas.width, canvas.height);
var data = imageData.data;
for (var i = 0; i < data.length; i += 4) {
var avg = (data[i] + data[i +1] + data[i +2]) / 3;
avg > settings["threshold"] ? avg = 255 : avg = 0;
data[i] = avg; // red
data[i + 1] = avg; // green
data[i + 2] = avg; // blue
}
ctx.putImageData(imageData, 0, 0);
}
// Invert the colors of the canvas
function invert(canvas, ctx) {
var imageData = ctx.getImageData(0,0,canvas.width, canvas.height);
var data = imageData.data;
for (var i = 0; i < data.length; i += 4) {
data[i] = 255 - data[i]; // red
data[i + 1] = 255 - data[i + 1]; // green
data[i + 2] = 255 - data[i + 2]; // blue
}
ctx.putImageData(imageData, 0, 0);
}
// Draw the image onto the canvas, taking into account color and scaling
function place_image(image){
var img = image.img;
var canvas = image.canvas;
var ctx = canvas.getContext("2d");
image.ctx = ctx;
// Invert background if needed
if (settings["backgroundColor"] == "transparent") {
ctx.fillStyle = "rgba(0,0,0,0.0)";
ctx.globalCompositeOperation = 'copy';
} else {
if (settings["invertColors"]){
settings["backgroundColor"] == "white" ? ctx.fillStyle = "black" : ctx.fillStyle = "white";
} else {
ctx.fillStyle = settings["backgroundColor"];
}
ctx.globalCompositeOperation = 'source-over';
}
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.setTransform(1, 0, 0, 1, 0, 0); // start with identity matrix transform (no rotation).
if(settings["rotate180"]){
// Matrix transformation
ctx.translate(canvas.width/2.0, canvas.height/2.0);
ctx.rotate(Math.PI);
ctx.translate(-canvas.width/2.0, -canvas.height/2.0);
}
// Offset used for centering the image when requested
var offset_x = 0;
var offset_y = 0;
switch(settings["scale"]){
case "1": // Original
if(settings["centerHorizontally"]){ offset_x = Math.round((canvas.width - img.width) / 2); }
if(settings["centerVertically"]){ offset_y = Math.round((canvas.height - img.height) / 2); }
ctx.drawImage(img, 0, 0, img.width, img.height,
offset_x, offset_y, img.width, img.height);
break;
case "2": // Fit (make as large as possible without changing ratio)
var horRatio = canvas.width / img.width;
var verRatio = canvas.height / img.height;
var useRatio = Math.min(horRatio, verRatio);
if(settings["centerHorizontally"]){ offset_x = Math.round((canvas.width - img.width*useRatio) / 2); }
if(settings["centerVertically"]){ offset_y = Math.round((canvas.height - img.height*useRatio) / 2); }
ctx.drawImage(img, 0, 0, img.width, img.height,
offset_x, offset_y, img.width * useRatio, img.height * useRatio);
break;
case "3": // Stretch x+y (make as large as possible without keeping ratio)
ctx.drawImage(img, 0, 0, img.width, img.height,
offset_x, offset_y, canvas.width, canvas.height);
break;
case "4": // Stretch x (make as wide as possible)
offset_x = 0;
if(settings["centerVertically"]){ Math.round(offset_y = (canvas.height - img.height) / 2); }
ctx.drawImage(img, 0, 0, img.width, img.height,
offset_x, offset_y, canvas.width, img.height);
break;
case "5": // Stretch y (make as tall as possible)
if(settings["centerHorizontally"]){ offset_x = Math.round((canvas.width - img.width) / 2); }
offset_y = 0;
ctx.drawImage(img, 0, 0, img.width, img.height,
offset_x, offset_y, img.width, canvas.height);
break;
}
// Make sure the image is black and white
if(settings.conversionFunction == ConversionFunctions.horizontal1bit
|| settings.conversionFunction == ConversionFunctions.vertical1bit) {
blackAndWhite(canvas, ctx);
if(settings["invertColors"]){
invert(canvas, ctx);
}
}
// Flip image if needed
if (settings["flipHorizontally"]) {
ctx.save();
ctx.scale(-1, 1);
ctx.drawImage(canvas, -canvas.width, 0);
ctx.restore();
}
if (settings["flipVertically"]) {
ctx.save();
ctx.scale(1, -1);
ctx.drawImage(canvas, 0, -canvas.height);
ctx.restore();
}
}
// Handle inserting an image by pasting code
function handleTextInput(drawMode){
var canvas = document.createElement("canvas");
canvas.width = parseInt(document.getElementById("text-input-width").value);
canvas.height = parseInt(document.getElementById("text-input-height").value);
settings["screenWidth"] = canvas.width;
settings["screenHeight"] = canvas.height;
if(canvasContainer.children.length) {
canvasContainer.removeChild(canvasContainer.firstChild);
}
canvasContainer.appendChild(canvas);
var image = new Image();
images.setByIndex(0, {"img": image, "canvas" : canvas});
var input = document.getElementById("byte-input").value;
// Remove Arduino code
input = input.replace(/const\s+(unsigned\s+char|uint8_t)\s+[a-zA-Z0-9]+\s*\[\]\s*(PROGMEM\s*)?=\s*/g, "");
input = input.replace(/\};|\{/g, "");
// Convert newlines to comma (helps to remove comments later)
input = input.replace(/\r\n|\r|\n/g, ",");
// Convert multiple commas in a row into a single one
input = input.replace(/,{2,}/g, ",");
// Remove whitespace
input = input.replace(/\s/g, "");
//Remove comments
input = input.replace(/\/\/(.+?),/g, "");
// Remove "0x"
input = input.replace(/0[xX]/g, "");
// Split into list
var list = input.split(",");
console.log(list);
if(drawMode == "horizontal"){
listToImageHorizontal(list, canvas);
}else{
listToImageVertical(list, canvas);
}
}
function allSameSize(images, files) {
if(images.length() > 1 && images.length() == files.length) {
var inputs = imageSizeSettings.querySelectorAll("input");
allSameSizeButton.onclick = function() {
for(var i = 2; i < inputs.length; i++) {
if(inputs[i].name == "width") {
inputs[i].value = inputs[0].value;
inputs[i].oninput();
}
if(inputs[i].name == "height") {
inputs[i].value = inputs[1].value;
inputs[i].oninput();
}
}
};
allSameSizeButton.style.display = "block";
}
}
// Handle selecting an image with the file picker
function handleImageSelection(evt){
var files = evt.target.files;
onlyImagesFileError.style.display = "none";
files.length > 0 ?
noFileSelected.style.display = "none" :
noFileSelected.style.display = "block";
for (var i = 0, f; f = files[i]; i++) {
// Only process image files.
if(!f.type.match("image.*")) {
onlyImagesFileError.style.display = "block";
continue;
}
var reader = new FileReader();
reader.onload = (function(file) {
return function(e) {
// Render thumbnail.
var img = new Image();
img.onload = function(){
const fileInputColumnEntry = document.createElement("div");
fileInputColumnEntry.className = "file-input-entry";
const fileInputColumnEntryLabel = document.createElement("span");
fileInputColumnEntryLabel.textContent = file.name;
const fileInputColumnEntryRemoveButton = document.createElement("button");
fileInputColumnEntryRemoveButton.className = "remove-button";
fileInputColumnEntryRemoveButton.innerHTML = "remove";
var canvas = document.createElement("canvas");
var imageEntry = document.createElement("li");
imageEntry.setAttribute("data-img", file.name);
var w = document.createElement("input");
w.type = "number";
w.name = "width";
w.id = "screenWidth";
w.min = 0;
w.className = "size-input";
w.value = img.width;
settings["screenWidth"] = img.width;
w.oninput = function() { canvas.width = this.value; update(); updateInteger('screenWidth'); };
var h = document.createElement("input");
h.type = "number";
h.name = "height";
h.id = "screenHeight";