CODEWITHSUNDEEP
javascriptpixi.js
Donovan P
Donovan P

Reputation: 641

How to copy PIXI's view into another canvas

In theory it should be as easy as :

//targetCanvas is a canvas node
//app is instance of PIXI.Application
targetCanvas.drawImage(app.view, 0, 0);

But, trust me, It doesn't work!

Sometime (yes, I said sometime) it does work if I add some delay before copying the image into the targetCanvas. ... So, I wonder if there is an asynchronous process happening when PIXI is rendering... but I can not find this information in PIXI's documentation.

var loadImage = async function(imgPath) {
    return new Promise((resolve, reject) => {
        var img = document.createElement("img");
        img.onload = ()=> {
            resolve(img);
        }
        img.src = imgPath;
    })
}



var canvasTag = document.querySelector("#canvasVideo");
var canvasCtx = canvasTag.getContext("2d");

var canvasResult = document.querySelector("#canvasResult");
var canvasResultCtx = canvasResult.getContext("2d");

var canvasWidth = canvasTag.width;
var canvasHeight = canvasTag.height;


var canvasWidth = 320;
var canvasHeight = 240;
const app = new PIXI.Application({
    view: document.querySelector("#glCanvas"),
    transparent: true,
    width: canvasWidth,
    height: canvasHeight
});

const container = new PIXI.Container();
const renderer = PIXI.autoDetectRenderer();
app.stage.addChild(container);

(async ()=> {
    var imgTag = await loadImage("data:image/png;base64,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");
    canvasCtx.drawImage(imgTag, 0, 0, canvasWidth, canvasHeight);

    var bgSprite = PIXI.Sprite.from(imgTag);

    app.stage.addChild(bgSprite);

    canvasResultCtx.drawImage(document.querySelector("#glCanvas"), 0, 0);
})()
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://pixijs.download/release/pixi.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
    <title>Document</title>
</head>
<body>
    <canvas id="canvasVideo" width="320" height="240" autoplay></canvas>
    <canvas id="glCanvas" width="320" height="240" autoplay></canvas>
    <canvas id="canvasResult" width="320" height="240" autoplay></canvas>
</body>
</html>

canvasVideo (left) is normal canvas with 2d context. glCanvas (middle) is a PIXI's view canvasResult (right) is a normal canvas where a PIXI view should be copied into.

We don't have any problem copying canvas into PIXI. (except the CORS prevents the webGL renders the image correctly) But, as you can see, the third canvas is blank. I wonder if there is any solution to this issue... without using PIXI's ticker or setTimeout?

Upvotes: 1

Views: 488

Answers (2)

Eduardo P&#225;ez Rubio
Eduardo P&#225;ez Rubio

Reputation: 1152

You don't need to use the PIXI ticker or a custom timer (requestAnimationFrame as in your own response) to render to the canvas. There's the possibility to simply call app.render() in a synchronous way after the desired elements are added to the stage.

On top of that, if you want to prevent having a running application that renders on each frame, you may want to add autoStart: false to your Application config.

var loadImage = async function(imgPath) {
    return new Promise((resolve, reject) => {
        var img = document.createElement("img");
        img.onload = ()=> {
            resolve(img);
        }
        img.src = imgPath;
    })
}

var canvasWidth = 320;
var canvasHeight = 240;
const app = new PIXI.Application({
    view: document.querySelector("#glCanvas"),
    transparent: true,
    width: canvasWidth,
    height: canvasHeight,
    autoStart: false,
});

(async () => {
    var imgTag = await loadImage("data:image/png;base64,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");
    var bgSprite = PIXI.Sprite.from(imgTag);

    app.stage.addChild(bgSprite);

    app.render();
})()
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://pixijs.download/release/pixi.js"></script>
    <title>Document</title>
</head>
<body>
    <canvas id="glCanvas" width="320" height="240"></canvas>
</body>
</html>

Upvotes: 2

Kokodoko
Kokodoko

Reputation: 28128

The ticker is not used for non-animated sprites, but apparently pixi still needs ONE frame to draw everything before you can copy it.

I was able to solve your issue with one requestAnimationFrame

(async ()=> {
    var imgTag = await loadImage("data:image/png;base64,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");
    canvasCtx.drawImage(imgTag, 0, 0, canvasWidth, canvasHeight);

    var bgSprite = PIXI.Sprite.from(imgTag);
    app.stage.addChild(bgSprite);

    requestAnimationFrame(() => {
        canvasResultCtx.drawImage(document.querySelector("#glCanvas"), 0, 0);
    });
})()

Upvotes: 2

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