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src/core/operations/AddTextToImage.mjs
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/**
* @author j433866 [j433866@gmail.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import { isImage } from "../lib/FileType.mjs";
import { toBase64 } from "../lib/Base64.mjs";
import { isWorkerEnvironment } from "../Utils.mjs";
import jimp from "jimp";
/**
* Add Text To Image operation
*/
class AddTextToImage extends Operation {
/**
* AddTextToImage constructor
*/
constructor() {
super();
this.name = "Add Text To Image";
this.module = "Image";
this.description = "Adds text onto an image.<br><br>Text can be horizontally or vertically aligned, or the position can be manually specified.<br>Variants of the Roboto font face are available in any size or colour.";
this.infoURL = "";
this.inputType = "ArrayBuffer";
this.outputType = "ArrayBuffer";
this.presentType = "html";
this.args = [
{
name: "Text",
type: "string",
value: ""
},
{
name: "Horizontal align",
type: "option",
value: ["None", "Left", "Center", "Right"]
},
{
name: "Vertical align",
type: "option",
value: ["None", "Top", "Middle", "Bottom"]
},
{
name: "X position",
type: "number",
value: 0
},
{
name: "Y position",
type: "number",
value: 0
},
{
name: "Size",
type: "number",
value: 32,
min: 8
},
{
name: "Font face",
type: "option",
value: [
"Roboto",
"Roboto Black",
"Roboto Mono",
"Roboto Slab"
]
},
{
name: "Red",
type: "number",
value: 255,
min: 0,
max: 255
},
{
name: "Green",
type: "number",
value: 255,
min: 0,
max: 255
},
{
name: "Blue",
type: "number",
value: 255,
min: 0,
max: 255
},
{
name: "Alpha",
type: "number",
value: 255,
min: 0,
max: 255
}
];
}
/**
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {byteArray}
*/
async run(input, args) {
const text = args[0],
hAlign = args[1],
vAlign = args[2],
size = args[5],
fontFace = args[6],
red = args[7],
green = args[8],
blue = args[9],
alpha = args[10];
let xPos = args[3],
yPos = args[4];
if (!isImage(input)) {
throw new OperationError("Invalid file type.");
}
let image;
try {
image = await jimp.read(input);
} catch (err) {
throw new OperationError(`Error loading image. (${err})`);
}
try {
if (isWorkerEnvironment())
self.sendStatusMessage("Adding text to image...");
const fontsMap = {};
const fonts = [
import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/Roboto72White.fnt"),
import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/RobotoBlack72White.fnt"),
import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/RobotoMono72White.fnt"),
import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/RobotoSlab72White.fnt")
];
await Promise.all(fonts)
.then(fonts => {
fontsMap.Roboto = fonts[0];
fontsMap["Roboto Black"] = fonts[1];
fontsMap["Roboto Mono"] = fonts[2];
fontsMap["Roboto Slab"] = fonts[3];
});
// Make Webpack load the png font images
await Promise.all([
import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/Roboto72White.png"),
import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/RobotoSlab72White.png"),
import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/RobotoMono72White.png"),
import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/RobotoBlack72White.png")
]);
const font = fontsMap[fontFace];
// LoadFont needs an absolute url, so append the font name to self.docURL
const jimpFont = await jimp.loadFont(self.docURL + "/" + font.default);
jimpFont.pages.forEach(function(page) {
if (page.bitmap) {
// Adjust the RGB values of the image pages to change the font colour.
const pageWidth = page.bitmap.width;
const pageHeight = page.bitmap.height;
for (let ix = 0; ix < pageWidth; ix++) {
for (let iy = 0; iy < pageHeight; iy++) {
const idx = (iy * pageWidth + ix) << 2;
const newRed = page.bitmap.data[idx] - (255 - red);
const newGreen = page.bitmap.data[idx + 1] - (255 - green);
const newBlue = page.bitmap.data[idx + 2] - (255 - blue);
const newAlpha = page.bitmap.data[idx + 3] - (255 - alpha);
// Make sure the bitmap values don't go below 0 as that makes jimp very unhappy
page.bitmap.data[idx] = (newRed > 0) ? newRed : 0;
page.bitmap.data[idx + 1] = (newGreen > 0) ? newGreen : 0;
page.bitmap.data[idx + 2] = (newBlue > 0) ? newBlue : 0;
page.bitmap.data[idx + 3] = (newAlpha > 0) ? newAlpha : 0;
}
}
}
});
// Create a temporary image to hold the rendered text
const textImage = new jimp(jimp.measureText(jimpFont, text), jimp.measureTextHeight(jimpFont, text));
textImage.print(jimpFont, 0, 0, text);
// Scale the rendered text image to the correct size
const scaleFactor = size / 72;
if (size !== 1) {
// Use bicubic for decreasing size
if (size > 1) {
textImage.scale(scaleFactor, jimp.RESIZE_BICUBIC);
} else {
textImage.scale(scaleFactor, jimp.RESIZE_BILINEAR);
}
}
// If using the alignment options, calculate the pixel values AFTER the image has been scaled
switch (hAlign) {
case "Left":
xPos = 0;
break;
case "Center":
xPos = (image.getWidth() / 2) - (textImage.getWidth() / 2);
break;
case "Right":
xPos = image.getWidth() - textImage.getWidth();
break;
}
switch (vAlign) {
case "Top":
yPos = 0;
break;
case "Middle":
yPos = (image.getHeight() / 2) - (textImage.getHeight() / 2);
break;
case "Bottom":
yPos = image.getHeight() - textImage.getHeight();
break;
}
// Blit the rendered text image onto the original source image
image.blit(textImage, xPos, yPos);
let imageBuffer;
if (image.getMIME() === "image/gif") {
imageBuffer = await image.getBufferAsync(jimp.MIME_PNG);
} else {
imageBuffer = await image.getBufferAsync(jimp.AUTO);
}
return imageBuffer.buffer;
} catch (err) {
throw new OperationError(`Error adding text to image. (${err})`);
}
}
/**
* Displays the blurred image using HTML for web apps
*
* @param {ArrayBuffer} data
* @returns {html}
*/
present(data) {
if (!data.byteLength) return "";
const dataArray = new Uint8Array(data);
const type = isImage(dataArray);
if (!type) {
throw new OperationError("Invalid file type.");
}
return `<img src="data:${type};base64,${toBase64(dataArray)}">`;
}
}
export default AddTextToImage;