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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 http-equiv="content-type" content="text/html; charset=UTF-8">
<meta charset="UTF-8">
<title>image2cpp</title>
<style type="text/css">
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font-size: .9em;
line-height: 1.4em;
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.byte-input {
min-height: 160px;
min-width: 360px;
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.code-output {
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.glyph-input {
width: 80px;
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#image-size-settings {
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#image-size-settings li {
margin: 4px 0;
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border: 3px solid #88DAC5;
margin: 10px 15px;
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</head>
<body>
<div class="wrapper">
<section class="section">
<h1>image2cpp</h1>
<p>image2cpp is a simple tool to change images into byte arrays (or
your array back into an image) for use with Arduino and (monochrome)
displays such as OLEDs.
It was originally made to work with the Adafruit OLED library. An
example sketch for Arduino and this library can be found <a href="https://github.com/javl/image2cpp/blob/master/oled_example/oled_example.ino" target="_blank">here</a>.</p>
<p>More info (and credits) can be found in the <a href="https://github.com/javl/image2cpp" target="_blank">Github repository</a>. This is also where you can report any <a href="https://github.com/javl/image2cpp/issues" target="_blank">issues</a> you might come across.</p>
<p>This tool also works offline. Simply save this page to your computer and open the file in your browser.</p>
</section>
<section class="section bottom-divider">
<section class="sub-section">
<div class="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" onchange="updateRadio('backgroundColor')">
<label for="backgroundColorWhite" class="smallLabel">White</label>
<input id="backgroundColorBlack" type="radio" name="backgroundColor" value="black" onchange="updateRadio('backgroundColor')" checked="checked">
<label for="backgroundColorBlack" class="smallLabel">Black</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')" checked="checked">
</div>
</div>
<div class="table-row">
<div class="table-cell"><label>Brightness 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; pixels with brightness above become white, below become black.</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" selected="selected">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>
<div class="note">
<i>NOTE: Centering the image only works when using a canvas larger than the selected 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" selected="selected">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" style="display: none;">
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" style="display: none;">
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" style="display: none;">
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" style="display: none;">
<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" style="display: none;">
<div class="table-row">
<div class="table-cell"><label>Identifier:</label></div>
<div class="table-cell">
<input id="identifier" class="text-input" type="text" name="identifier" onchange="" value="myBitmap">
</div>
</div>
</div>
</div>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label>Draw mode:</label></div>
<div class="table-cell">
<input id="drawModeHorizontal" type="radio" name="drawMode" value="horizontal" checked="checked" onchange="updateRadio('drawMode')">
<label for="drawModeHorizontal" class="smallLabel">Horizontal</label>
<input id="drawModeVertical" type="radio" name="drawMode" value="vertical" onchange="updateRadio('drawMode')">
<label for="drawModeVertical" class="smallLabel">Vertical</label>
</div>
</div>
</div>
<div class="note">
<i>If your image looks all messed up on your display, like the image below, try the other mode.</i>
</div>
<img class="inlineImg" 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" alt="" width="150" height="64">
</section>
<section class="sub-section">
<button type="button" class="generate-button" onclick="outputString()">Generate code</button>
<textarea id="code-output" class="code-output"></textarea>
</section>
</section>
</div>
<script type="text/javascript">
// 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);
// 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,
backgroundColor: "white",
scale: "1",
drawMode: "horizontal",
threshold: 128,
outputFormat: "plain",
invertColors: false
};
// 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;
}
// 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;
// Make sure we're using the right canvas size
//canvas.width = settings["screenWidth"];
//canvas.height = settings["screenHeight"];
// Invert background if needed
if (settings["invertColors"]){
settings["backgroundColor"] == "white" ? ctx.fillStyle = "black" : ctx.fillStyle = "white";
}else{
ctx.fillStyle = settings["backgroundColor"];
}
ctx.fillRect(0, 0, canvas.width, canvas.height);
// 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 = (canvas.width - img.width) / 2; }
if(settings["centerVertically"]){ offset_y = (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 = (canvas.width - img.width*useRatio) / 2; }
if(settings["centerVertically"]){ offset_y = (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"]){ 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 = (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
blackAndWhite(canvas, ctx);
if(settings["invertColors"]){
invert(canvas, ctx);
}
}
// 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 unsigned char myBitmap \[\] PROGMEM = \{/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(/0x/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(){
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";
h.min = 0;
h.className = "size-input";
h.value = img.height;
settings["screenHeight"] = img.height;
h.oninput = function() { canvas.height = this.value; update(); updateInteger('screenHeight'); };
var gil = document.createElement("span");
gil.innerHTML = "glyph";
gil.className = "file-info";
var gi = document.createElement("input");
gi.type = "text";
gi.name = "glyph";
gi.className = "glyph-input";
gi.onchange = function() {
var image = images.get(img);
image.glyph = gi.value;
};
var fn = document.createElement("span");
fn.className = "file-info";
fn.innerHTML = file.name + " (file resolution: " + img.width + " x " + img.height + ")";
fn.innerHTML += "<br />";
var rb = document.createElement("button");
rb.className = "remove-button";
rb.innerHTML = "remove";
rb.onclick = function() {
var image = images.get(img);
canvasContainer.removeChild(image.canvas);
images.remove(image);
imageSizeSettings.removeChild(imageEntry);
if(imageSizeSettings.children.length == 1) {
allSameSizeButton.style.display = "none";
}
if(images.length() == 0) noFileSelected.style.display = "block";
update();
};
imageEntry.appendChild(fn);
imageEntry.appendChild(w);
imageEntry.appendChild(document.createTextNode(" x "));
imageEntry.appendChild(h);
imageEntry.appendChild(gil);
imageEntry.appendChild(gi);
imageEntry.appendChild(rb);
imageSizeSettings.appendChild(imageEntry);
canvas.width = img.width;
canvas.height = img.height;
canvasContainer.appendChild(canvas);
images.push(img, canvas, file.name.split(".")[0]);
place_image(images.last());
allSameSize(images, files);
};
img.src = e.target.result;
};
})(f);
reader.readAsDataURL(f);
}
}
function imageToString(orientation, image){
if(orientation == "horizontal")
return imageToStringHorizontal(image);
return imageToStringVertical(image);
}
// Output the image as a string for horizontally drawing displays
function imageToStringHorizontal(image){
var ctx = image.ctx;
var canvas = image.canvas;
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
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 < imageData.data.length; index += 4){
// Get the average of the RGB (we ignore A)
var avg = (imageData.data[index] + imageData.data[index + 1] + imageData.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)%(canvas.width)) == 0 ) || (index == imageData.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
function imageToStringVertical(image){
var ctx = image.ctx;
var canvas = image.canvas;
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
var data = imageData.data;
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;
}
// Get the custom arduino output variable name, if any
function getIdentifier() {
var vn = document.getElementById("identifier");
return vn && vn.value.length ? vn.value : identifier;
}
// Output the image string to the textfield
function outputString(){
var output_string = "", count = 1;
var code = "";
switch(settings["outputFormat"]) {
case "arduino": {
images.each(function(image) {
code = imageToString(settings["drawMode"], image);
// Trim whitespace from end and remove trailing comma
code = code.replace(/,\s*$/,"");
code = "\t" + code.split("\n").join("\n\t") + "\n";
var variableCount = images.length() > 1 ? count++ : "";
var comment = "// '" + image.glyph + "', "+image.canvas.width+"x"+image.canvas.height+"px\n";
code = comment + "const unsigned char " +
getIdentifier() +
variableCount +
" [] PROGMEM = {" +
"\n" + code + "};\n";
output_string += code;
});
break;
}
case "arduino_single": {
var comment = "";
images.each(function(image) {
code = imageToString(settings["drawMode"], image);
code = "\t" + code.split("\n").join("\n\t") + "\n";
comment = "\t// '" + image.glyph + ", " + image.canvas.width+"x"+image.canvas.height+"px\n";
output_string += comment + code;
});
output_string = output_string.replace(/,\s*$/,"");
output_string = "const unsigned char "
+ getIdentifier()
+ " [] PROGMEM = {"
+ "\n" + output_string + "\n};";
break;
}
case "adafruit_gfx": { // bitmap
var comment = "";
var useGlyphs = 0;
images.each(function(image) {
code = imageToString(settings["drawMode"], image);
code = "\t" + code.split("\n").join("\n\t") + "\n";
comment = "\t// '" + image.glyph + ", " + image.canvas.width+"x"+image.canvas.height+"px\n";
output_string += comment + code;
if(image.glyph.length == 1) useGlyphs++;
});
output_string = output_string.replace(/,\s*$/,"");
output_string = "const unsigned char "
+ getIdentifier()
+ "Bitmap"
+ " [] PROGMEM = {"
+ "\n" + output_string + "\n};\n\n"
+ "const GFXbitmapGlyph "
+ getIdentifier()
+ "Glyphs [] PROGMEM = {\n";
var firstAschiiChar = document.getElementById("first-ascii-char").value;
var xAdvance = parseInt(document.getElementById("x-advance").value);
var offset = 0;
code = "";
// GFXbitmapGlyph
images.each(function(image) {
code += "\t{ "
+ offset + ", "
+ image.canvas.width + ", "
+ image.canvas.height + ", "
+ xAdvance + ", "
+ "'" + (images.length() == useGlyphs ?
image.glyph :
String.fromCharCode(firstAschiiChar++)) + "'"
+ " }";
if(image != images.last()){ code += ","; }
code += "// '" + image.glyph + "'\n";
offset += image.canvas.width;
});
code += "};\n";
output_string += code;
// GFXbitmapFont
output_string += "\nconst GFXbitmapFont "
+ getIdentifier()
+ "Font PROGMEM = {\n"
+ "\t(uint8_t *)"
+ getIdentifier() + "Bitmap,\n"
+ "\t(GFXbitmapGlyph *)"
+ getIdentifier()
+ "Glyphs,\n"
+ "\t" + images.length()
+ "\n};\n";
break;
}
default: { // plain
images.each(function(image) {
code = imageToString(settings["drawMode"], image);
var comment = image.glyph ? ("// '" + image.glyph + "', " + image.canvas.width+"x"+image.canvas.height+"px\n") : "";
if(image.img != images.first().img) comment = "\n" + comment;
code = comment + code;
output_string += code;
});
// Trim whitespace from end and remove trailing comma
output_string = output_string.replace(/,\s*$/gm,"");
}
}
document.getElementById("code-output").value = output_string;
}
// Use the horizontally oriented list to draw the image
function listToImageHorizontal(list, canvas){
var ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, canvas.width, canvas.height);
var imgData = ctx.createImageData(canvas.width, canvas.height);
var index = 0;
var page = 0;
var x = 0;
var y = 7;
// Move the list into the imageData object
for (var i=0;i<list.length;i++){
var binString = hexToBinary(list[i]);
if(!binString.valid){
alert("Something went wrong converting the string. Did you forget to remove any comments from the input?");
console.log("invalid hexToBinary: ", binString.s);
return;
}
binString = binString.result;
if (binString.length == 4){
binString = binString + "0000";
}
// Check if pixel is white or black
for(var k=0; k<binString.length; k++){
var color = 0;
if(binString.charAt(k) == "1"){
color = 255;
}
imgData.data[index] = color;
imgData.data[index+1] = color;
imgData.data[index+2] = color;
imgData.data[index+3] = 255;
index += 4;
}
}
// Draw the image onto the canvas, then save the canvas contents
// inside the img object. This way we can reuse the img object when
// we want to scale / invert, etc.
ctx.putImageData(imgData, 0, 0);
var img = new Image();
img.src = canvas.toDataURL("image/png");
images.first().img = img;
}
// Use the vertically oriented list to draw the image
function listToImageVertical(list, canvas){
var ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, canvas.width, canvas.height);
var index = 0;
var page = 0;
var x = 0;
var y = 7;
// Move the list into the imageData object
for (var i=0;i<list.length;i++){
var binString = hexToBinary(list[i]);
if(!binString.valid){
alert("Something went wrong converting the string. Did you forget to remove any comments from the input?");
console.log("invalid hexToBinary: ", binString.s);
return;
}
binString = binString.result;
if (binString.length == 4){
binString = binString + "0000";
}
// Check if pixel is white or black
for(var k=0; k<binString.length; k++){
var color = 0;
if(binString.charAt(k) == "1"){
color = 255;
}
drawPixel(ctx, x, (page*8)+y, color);
y--;
if(y < 0){
y = 7;
x++;
if(x >= settings["screenWidth"]){
x = 0;
page++;
}
}
}
}
// Save the canvas contents inside the img object. This way we can
// reuse the img object when we want to scale / invert, etc.
var img = new Image();
img.src = canvas.toDataURL("image/png");
images.first().img = img;
}
// Convert hex to binary
function hexToBinary(s) {
var i, k, part, ret = "";
// lookup table for easier conversion. "0" characters are
// padded for "1" to "7"
var lookupTable = {
"0": "0000", "1": "0001", "2": "0010", "3": "0011", "4": "0100",
"5": "0101", "6": "0110", "7": "0111", "8": "1000", "9": "1001",
"a": "1010", "b": "1011", "c": "1100", "d": "1101", "e": "1110",
"f": "1111", "A": "1010", "B": "1011", "C": "1100", "D": "1101",
"E": "1110", "F": "1111"
};
for (i = 0; i < s.length; i += 1) {
if (lookupTable.hasOwnProperty(s[i])) {
ret += lookupTable[s[i]];
} else {
return { valid: false, s: s };
}
}
return { valid: true, result: ret };
}
// Quick and effective way to draw single pixels onto the canvas
// using a global 1x1px large canvas
function drawPixel(ctx, x, y, color) {
var single_pixel = ctx.createImageData(1,1);
var d = single_pixel.data;
d[0] = color;
d[1] = color;
d[2] = color;
d[3] = 255;
ctx.putImageData(single_pixel, x, y);
}
</script>
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