javascript - Canvas 中的最近邻插值(internet explorer 9)

Question

感谢 d3.js (类似于 this )，我创建了一个简单的图像查看器(带有网格和图像)，带有 Canvas (仅图像)和一些 svg 网格线。我使用 d3.js 中的缩放功能来缩放和平移我的图像/网格线。

Canvas 上的图像应使用最近邻插值。我设置了很多风格元素来实现这个目标。 Chrome 和 Firefox 运行良好，但我在使用 Internet Explorer 9 时遇到问题(我需要支持 ie9)。在 IE9 中图像总是模糊的。

Internet Explorer 9 是否支持 Canvas 的最近邻插值？

我的设置正确吗？

我在 d3.js 中的 Canvas 代码:

canvas
        .attr("width", dx)
        .attr("height", dy)
        .attr("style", "outline: thin solid black;")
        .style("width", width + "px")
        .style("height", height + "px")
        .style("transform", "translate(" + marginleft + "px,0)")
        .style("image-rendering","-moz-crisp-edges")
        .style("image-rendering","-o-crisp-edges")
        .style("image-rendering","-webkit-optimize-contrast")
        .style("image-rendering","optimize-contrast")
        .style("image-rendering","pixelated")
        .style("-ms-interpolation-mode","nearest-neighbor")
        .call(drawImage);

这个 d3.js 代码应该(主要)代表这个 css

   img { 
            image-rendering: optimizeSpeed;             
            image-rendering: -moz-crisp-edges;          // Firefox
            image-rendering: -o-crisp-edges;            // Opera
            image-rendering: -webkit-optimize-contrast; // Chrome (and eventually Safari)
            image-rendering: pixelated;                 // Chrome
            image-rendering: optimize-contrast;         // CSS3 Proposed
            -ms-interpolation-mode: nearest-neighbor;   // IE8+
        }

这是我的绘图函数

function drawImage(canvas2: any) {
        var context = canvas.node().getContext("2d");
        var image = context.createImageData(dx, dy);

        for (var y = 0, p = -1; y < dy; ++y) {
            for (var x = 0; x < dx; ++x) {
                let pixval = heatmap[y][x];                                     
                var c = d3.rgb(color(pixval));
                if(pixval <= min){
                    c = d3.rgb(255,255,255);    
                }
                image.data[++p] = c.r;
                image.data[++p] = c.g;
                image.data[++p] = c.b;
                image.data[++p] = 255;
            }
        }

        context.mozImageSmoothingEnabled = false;
        context.ImageSmoothingEnabled = false; //context.webkitImageSmoothingEnabled = false;
        context.msImageSmoothingEnabled = false;
        context.imageSmoothingEnabled = false;

        context.putImageData(image, 0, 0);
        imageObj.src = canvas.node().toDataURL();
    }

Answer 1

请参阅 MDN's image-rendering page 上的兼容性说明 (强调我的)

[1] Internet Explorer 7 and 8 supports the non-standard -ms-interpolation-mode property with two values (bicubic and nearest-neighbor):

applies only to images (JPG, GIF, PNG, ...)

in IE7 only for images without transparency

does not inherit

default value IE7: nearest-neighbor (low quality)

default value IE8: bicubic (high quality)

obsolete as of IE9

看来答案是否定的，IE9 不支持。