canvas 中的最近邻插值（Internet Explorer 9）

Question

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-gridlines 感谢 d3.js（类似于 this).我使用 d3.js 的缩放功能来缩放和平移我的 image/gridlines.

我在 canvas 上的图像应该使用最近邻插值法。我已经设置了许多样式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？

我的 canvas 代码在 d3.js:

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代码应该代表（大部分）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+
        }

这是我的绘制函数

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。

canvas 中的最近邻插值（Internet Explorer 9）

Nearest-neighbor interpolation in canvas (internet explorer 9)

javascript

canvas

nearest-neighbor

internet-explorer-9

d3.js