fabric.js-从canvas API的ImageData对象创建Image对象 [英] fabric.js - create Image object from ImageData object of canvas API

问题描述

我想从 ImageData 对象在fabric.js中创建一个图像对象，我们可以从中获取ImageData:

I want to create an image object in fabric.js from ImageData object, we can get ImageData from this:

var imgData=ctx.getImageData(10,10,50,50);
//ctx.putImageData(imgData,10,70);

// something liket that
var image = new fabric.Image.fromImageData (...);

是否可以通过 ImageData 对象创建图像对象?

Is there any way to create an image object from ImageData object?

推荐答案

让我把我的想法放在这里，我不喜欢这种方式，但是周围没有其他人-

Let me put my idea here, I don't like this way but have no others around -

var ctx = canvas.getContext('2d');
var data = ctx.getImageData(0, 0, 20, 20);

var c = document.createElement('canvas');

c.setAttribute('id', '_temp_canvas');
c.width = 20;
c.height = 20;

c.getContext('2d').putImageData(data, 0, 0);

fabric.Image.fromURL(c.toDataURL(), function(img) {
    img.left = 50;
    img.top = 50;
    canvas.add(img);
    img.bringToFront();
    c = null;
    $('#_temp_canvas').remove();
    canvas.renderAll();
});

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