如何使 Firefox 的 canvas 的行为与基于 Chromium 的浏览器相同?
How to make Firefox's canvas behave the same as in Chromium-based browsers?
在基于 Chromium 的浏览器中(我使用的是 brave),canvas
以这种方式呈现:
但在 Firefox 中,出于某种原因,它是这样呈现的:
这是我使用的方法:
context.drawImage(image, 100, 100, 100, 400);
我没有在 canvas
元素上使用任何 CSS,只是这样:
html,
body {
width: 100%;
height: 100%;
margin: 0;
overflow: hidden;
}
然后调整大小并附加 canvas
:
const canvas = document.createElement("canvas");
document.body.appendChild(canvas);
export const graphics = canvas.getContext("2d");
const adaptResolution = () => {
canvas.width = innerWidth;
canvas.height = innerHeight;
};
adaptResolution();
addEventListener("resize", adaptResolution);
我能否使 Firefox canvas
的行为与基于 Chromium 的浏览器相同?是什么导致了这种差异,我该如何解决?
这是我要在屏幕上呈现的 SVG:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
width="768"
height="576"
viewBox="0 0 203.2 152.4"
version="1.1"
id="svg5"
inkscape:version="1.1 (c68e22c387, 2021-05-23)"
sodipodi:docname="box.svg"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns="http://www.w3.org/2000/svg"
xmlns:svg="http://www.w3.org/2000/svg">
<sodipodi:namedview
id="namedview7"
pagecolor="#ffffff"
bordercolor="#666666"
borderopacity="1.0"
inkscape:pageshadow="2"
inkscape:pageopacity="0.0"
inkscape:pagecheckerboard="0"
inkscape:document-units="px"
showgrid="false"
units="px"
inkscape:zoom="0.38752104"
inkscape:cx="107.09096"
inkscape:cy="187.08661"
inkscape:window-width="1920"
inkscape:window-height="1016"
inkscape:window-x="0"
inkscape:window-y="27"
inkscape:window-maximized="1"
inkscape:current-layer="layer1" />
<defs
id="defs2" />
<g
inkscape:label="Layer 1"
inkscape:groupmode="layer"
id="layer1">
<rect
style="fill:#000000;stroke-width:0.387859"
id="rect31"
width="206.87587"
height="153.6207"
x="-1.7069"
y="-1.7068989" />
</g>
</svg>
这是一个互操作问题,我已经在 the specs 上报告过。
不幸的是,它还没有得到太多关注...
问题是目前尚不清楚应该对哪个“图像”drawImage
的调整大小选项起作用。 Chrome 认为它应该以默认大小处理输入 svg 并对其进行拉伸,Firefox 认为调整大小选项是输出框,并将调整 svg 内容以适应此框。
要在 Firefox 中获得 Chrome 的行为,您可以将 preserveAspectRatio="none"
属性添加到 SVG 图像的根目录:
const svg = new Blob([`<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
preserveAspectRatio="none"
width="768"
height="576"
viewBox="0 0 203.2 152.4"
version="1.1"
id="svg5"
inkscape:version="1.1 (c68e22c387, 2021-05-23)"
sodipodi:docname="box.svg"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns="http://www.w3.org/2000/svg"
xmlns:svg="http://www.w3.org/2000/svg">
<sodipodi:namedview
id="namedview7"
pagecolor="#ffffff"
bordercolor="#666666"
borderopacity="1.0"
inkscape:pageshadow="2"
inkscape:pageopacity="0.0"
inkscape:pagecheckerboard="0"
inkscape:document-units="px"
showgrid="false"
units="px"
inkscape:zoom="0.38752104"
inkscape:cx="107.09096"
inkscape:cy="187.08661"
inkscape:window-width="1920"
inkscape:window-height="1016"
inkscape:window-x="0"
inkscape:window-y="27"
inkscape:window-maximized="1"
inkscape:current-layer="layer1" />
<defs
id="defs2" />
<g
inkscape:label="Layer 1"
inkscape:groupmode="layer"
id="layer1">
<rect
style="fill:#000000;stroke-width:0.387859"
id="rect31"
width="206.87587"
height="153.6207"
x="-1.7069"
y="-1.7068989" />
</g>
</svg>`], { type:"image/svg+xml"});
const img = new Image();
img.src = URL.createObjectURL(svg);
img.onload = e => document.querySelector("canvas").getContext("2d").drawImage(img, 0, 0, 100, 400);
<canvas width="500" height="500"></canvas>
在基于 Chromium 的浏览器中(我使用的是 brave),canvas
以这种方式呈现:
但在 Firefox 中,出于某种原因,它是这样呈现的:
这是我使用的方法:
context.drawImage(image, 100, 100, 100, 400);
我没有在 canvas
元素上使用任何 CSS,只是这样:
html,
body {
width: 100%;
height: 100%;
margin: 0;
overflow: hidden;
}
然后调整大小并附加 canvas
:
const canvas = document.createElement("canvas");
document.body.appendChild(canvas);
export const graphics = canvas.getContext("2d");
const adaptResolution = () => {
canvas.width = innerWidth;
canvas.height = innerHeight;
};
adaptResolution();
addEventListener("resize", adaptResolution);
我能否使 Firefox canvas
的行为与基于 Chromium 的浏览器相同?是什么导致了这种差异,我该如何解决?
这是我要在屏幕上呈现的 SVG:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
width="768"
height="576"
viewBox="0 0 203.2 152.4"
version="1.1"
id="svg5"
inkscape:version="1.1 (c68e22c387, 2021-05-23)"
sodipodi:docname="box.svg"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns="http://www.w3.org/2000/svg"
xmlns:svg="http://www.w3.org/2000/svg">
<sodipodi:namedview
id="namedview7"
pagecolor="#ffffff"
bordercolor="#666666"
borderopacity="1.0"
inkscape:pageshadow="2"
inkscape:pageopacity="0.0"
inkscape:pagecheckerboard="0"
inkscape:document-units="px"
showgrid="false"
units="px"
inkscape:zoom="0.38752104"
inkscape:cx="107.09096"
inkscape:cy="187.08661"
inkscape:window-width="1920"
inkscape:window-height="1016"
inkscape:window-x="0"
inkscape:window-y="27"
inkscape:window-maximized="1"
inkscape:current-layer="layer1" />
<defs
id="defs2" />
<g
inkscape:label="Layer 1"
inkscape:groupmode="layer"
id="layer1">
<rect
style="fill:#000000;stroke-width:0.387859"
id="rect31"
width="206.87587"
height="153.6207"
x="-1.7069"
y="-1.7068989" />
</g>
</svg>
这是一个互操作问题,我已经在 the specs 上报告过。
不幸的是,它还没有得到太多关注...
问题是目前尚不清楚应该对哪个“图像”drawImage
的调整大小选项起作用。 Chrome 认为它应该以默认大小处理输入 svg 并对其进行拉伸,Firefox 认为调整大小选项是输出框,并将调整 svg 内容以适应此框。
要在 Firefox 中获得 Chrome 的行为,您可以将 preserveAspectRatio="none"
属性添加到 SVG 图像的根目录:
const svg = new Blob([`<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
preserveAspectRatio="none"
width="768"
height="576"
viewBox="0 0 203.2 152.4"
version="1.1"
id="svg5"
inkscape:version="1.1 (c68e22c387, 2021-05-23)"
sodipodi:docname="box.svg"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns="http://www.w3.org/2000/svg"
xmlns:svg="http://www.w3.org/2000/svg">
<sodipodi:namedview
id="namedview7"
pagecolor="#ffffff"
bordercolor="#666666"
borderopacity="1.0"
inkscape:pageshadow="2"
inkscape:pageopacity="0.0"
inkscape:pagecheckerboard="0"
inkscape:document-units="px"
showgrid="false"
units="px"
inkscape:zoom="0.38752104"
inkscape:cx="107.09096"
inkscape:cy="187.08661"
inkscape:window-width="1920"
inkscape:window-height="1016"
inkscape:window-x="0"
inkscape:window-y="27"
inkscape:window-maximized="1"
inkscape:current-layer="layer1" />
<defs
id="defs2" />
<g
inkscape:label="Layer 1"
inkscape:groupmode="layer"
id="layer1">
<rect
style="fill:#000000;stroke-width:0.387859"
id="rect31"
width="206.87587"
height="153.6207"
x="-1.7069"
y="-1.7068989" />
</g>
</svg>`], { type:"image/svg+xml"});
const img = new Image();
img.src = URL.createObjectURL(svg);
img.onload = e => document.querySelector("canvas").getContext("2d").drawImage(img, 0, 0, 100, 400);
<canvas width="500" height="500"></canvas>