html - SVG 过滤器和画布像素
问题描述
我正在尝试检索已应用过滤器的画布的像素。
在下面的示例中,我在 上应用过滤器mycanvas1
,在其上绘制图像,然后在另一个画布上绘制该画布mycanvas2
:
async function loadImageFromBase64(base64) {
return new Promise(resolve => {
const image = new Image();
image.onload = () => resolve(image);
image.src = base64;
});
}
async function main() {
const image = await(loadImageFromBase64(imageBase64));
const mycanvas1 = document.getElementById('mycanvas1');
const myctx1 = mycanvas1.getContext('2d');
const mycanvas2 = document.getElementById('mycanvas2');
const myctx2 = mycanvas2.getContext('2d');
myctx1.drawImage(image, 0, 0);
myctx2.drawImage(mycanvas1, 0, 0);
}
window.onload = main;
const imageBase64 = 'data:image/svg+xml;base64,<?xml version="1.0" encoding="iso-8859-1"?>
<!-- Generator: Adobe Illustrator 15.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 width="128px" height="128px" viewBox="0 0 128 128" style="enable-background:new 0 0 128 128;" xml:space="preserve">
<g>
	<circle style="fill:#88C5CC;" cx="64" cy="64" r="64"/>
	<path style="fill:#80B9BF;" d="M110.723,107.716c-0.029-0.213-0.09-0.416-0.185-0.602c0.002-0.039,0.013-0.075,0.013-0.114
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		c-0.044-0.375-0.189-0.718-0.414-1c-0.044-0.375-0.189-0.718-0.414-1c-0.044-0.375-0.189-0.718-0.414-1
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		c-0.043-0.375-0.188-0.718-0.413-1c-0.043-0.375-0.189-0.718-0.414-1c-0.043-0.375-0.189-0.718-0.414-1
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		c-0.043-0.375-0.188-0.717-0.412-1c-0.045-0.375-0.189-0.718-0.414-1c-0.027-0.234-0.094-0.455-0.195-0.658
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	<path style="fill:#F5F5F5;" d="M50.953,36v71c0,7.18,5.82,13,13,13c7.18,0,13-5.82,13-13V36H50.953z"/>
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	<path style="fill:#B3B3B3;" d="M62.953,46h-7c-0.553,0-1-0.448-1-1s0.447-1,1-1h7c0.553,0,1,0.448,1,1S63.506,46,62.953,46z"/>
	<path style="fill:#B3B3B3;" d="M57.953,50h-2c-0.553,0-1-0.448-1-1s0.447-1,1-1h2c0.553,0,1,0.448,1,1S58.506,50,57.953,50z"/>
	<path style="fill:#B3B3B3;" d="M62.953,54h-7c-0.553,0-1-0.448-1-1s0.447-1,1-1h7c0.553,0,1,0.448,1,1S63.506,54,62.953,54z"/>
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	<rect x="50.953" y="36" style="fill:#CCCCCC;" width="26" height="1"/>
</g>
</svg>
';
<!DOCTYPE html>
<html>
<head>
<title>My Filter</title>
<meta charset="utf-8">
<style>
#mycanvas1 {
filter: url(#myfilter);
border: 3px solid blue;
}
#mycanvas2 {
border: 3px solid red;
}
</style>
</head>
<body>
<canvas id="mycanvas1"></canvas>
<canvas id="mycanvas2"></canvas>
<svg>
<filter id="myfilter" x="0" y="0" width="100%" height="100%">
<feColorMatrix type="luminanceToAlpha"/>
</filter>
</svg></body>
</html>
但是过滤器似乎并没有应用于画布像素。它们是后处理的,这就是为什么第二个画布包含没有过滤器的图像。有没有办法在应用了过滤器的情况下检索画布的像素?
我需要这个,因为我需要在 javascript 中执行一些过滤器的事后操作。
解决方案
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