Chrome会在canvas元素上以不同方式转换文本.为什么？

似乎Chrome强制在canvas元素顶部的文本上进行硬件加速转换.

任何人都可以帮我理解这种行为吗？最终,我想在没有将文本转换为纹理的情况下在canvas元素上缩放文本.

这个小提琴显示了这个问题:http://jsfiddle.net/Gb6h4/1/

这是代码:

// Get a reference to the canvas and its context
var $canvas = $("canvas");
var ctx = $canvas[0].getContext('2d');

// Make the canvas fullscreen
var width = $(window).width(),
    height = $(window).height();
$canvas.attr({
    width: width,
    height: height
});

// In Chrome, modifying the canvas context in any way
// seems to force a hardware-accelerated transform
// on the text.
// (The text is scaled as a texture, becoming blurrier.)

// Uncomment the line below and compare the difference.
// ctx.fillStyle = "grey";

// Set up a simple zoom animation on our "Hello!" div
var $div = $(".transformed");
var scale = 1;
setInterval(function () {
    scale += 0.005;
    $div.css({
        transform: "translate(0px, 0px) scale("+scale+")"
    });
}, 16);

在小提琴中,默认情况下,文本按预期进行缩放(即,非加速CSS变换).但是,在与画布上下文交互后,文本的缩放方式不同(就像在加速转换中一样).