Let’s take the QQ icon as an example
1. Place the red and gray QQ icons into a PNG image, and control the display of the icons through background-position and over:hidden.
2. Make the QQ icon into a font, and reference the font through font-face. For example, the QQ icon corresponds to the letter A, then I can use it like this:
3. Use the svg-filter filter to color QQ pictures. Below is an svg filter.
<span style="color: #0000ff;"><span style="color: #800000;">svg </span><span style="color: #ff0000;">xmlns</span><span style="color: #0000ff;">="http://www.w3.org/2000/svg"</span><span style="color: #ff0000;"> width</span><span style="color: #0000ff;">="160"</span><span style="color: #ff0000;"> height</span><span style="color: #0000ff;">="160"</span><span style="color: #ff0000;"> viewBox</span><span style="color: #0000ff;">="0 0 160 160"</span><span style="color: #0000ff;">><span style="color: #800000;">defs</span><span style="color: #0000ff;">><span style="color: #800000;">filter </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="a"</span><span style="color: #ff0000;"> color-interpolation-filters</span><span style="color: #0000ff;">="sRGB"</span><span style="color: #0000ff;">><span style="color: #800000;">feComposite </span><span style="color: #ff0000;">in2</span><span style="color: #0000ff;">="SourceGraphic"</span><span style="color: #ff0000;"> operator</span><span style="color: #0000ff;">="arithmetic"</span><span style="color: #ff0000;"> k2</span><span style="color: #0000ff;">="1"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="composite1"</span><span style="color: #0000ff;">/><span style="color: #800000;">feColorMatrix </span><span style="color: #ff0000;">in</span><span style="color: #0000ff;">="composite1"</span><span style="color: #ff0000;"> values</span><span style="color: #0000ff;">="1"</span><span style="color: #ff0000;"> type</span><span style="color: #0000ff;">="saturate"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="colormatrix1"</span><span style="color: #0000ff;">/><span style="color: #800000;">feFlood </span><span style="color: #ff0000;">flood-opacity</span><span style="color: #0000ff;">="1"</span><span style="color: #ff0000;"> flood-color</span><span style="color: #0000ff;">="#3A9E00"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="flood1"</span><span style="color: #0000ff;">/><span style="color: #800000;">feBlend </span><span style="color: #ff0000;">in</span><span style="color: #0000ff;">="flood1"</span><span style="color: #ff0000;"> in2</span><span style="color: #0000ff;">="colormatrix1"</span><span style="color: #ff0000;"> mode</span><span style="color: #0000ff;">="multiply"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="blend1"</span><span style="color: #0000ff;">/><span style="color: #800000;">feBlend </span><span style="color: #ff0000;">in2</span><span style="color: #0000ff;">="blend1"</span><span style="color: #ff0000;"> mode</span><span style="color: #0000ff;">="screen"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="blend2"</span><span style="color: #0000ff;">/><span style="color: #800000;">feColorMatrix </span><span style="color: #ff0000;">in</span><span style="color: #0000ff;">="blend2"</span><span style="color: #ff0000;"> values</span><span style="color: #0000ff;">="1"</span><span style="color: #ff0000;"> type</span><span style="color: #0000ff;">="saturate"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="colormatrix2"</span><span style="color: #0000ff;">/><span style="color: #800000;">feComposite </span><span style="color: #ff0000;">in</span><span style="color: #0000ff;">="colormatrix2"</span><span style="color: #ff0000;"> in2</span><span style="color: #0000ff;">="SourceGraphic"</span><span style="color: #ff0000;"> operator</span><span style="color: #0000ff;">="in"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="fbSourceGraphic"</span><span style="color: #0000ff;">/><span style="color: #800000;">feColorMatrix </span><span style="color: #ff0000;">result</span><span style="color: #0000ff;">="fbSourceGraphicAlpha"</span><span style="color: #ff0000;"> in</span><span style="color: #0000ff;">="fbSourceGraphic"</span><span style="color: #ff0000;"> values</span><span style="color: #0000ff;">="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"</span><span style="color: #0000ff;">/><span style="color: #800000;">feComposite </span><span style="color: #ff0000;">in2</span><span style="color: #0000ff;">="fbSourceGraphic"</span><span style="color: #ff0000;"> operator</span><span style="color: #0000ff;">="arithmetic"</span><span style="color: #ff0000;"> k2</span><span style="color: #0000ff;">="1"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="composite1"</span><span style="color: #ff0000;"> in</span><span style="color: #0000ff;">="fbSourceGraphic"</span><span style="color: #0000ff;">/><span style="color: #800000;">feColorMatrix </span><span style="color: #ff0000;">in</span><span style="color: #0000ff;">="composite1"</span><span style="color: #ff0000;"> values</span><span style="color: #0000ff;">="1"</span><span style="color: #ff0000;"> type</span><span style="color: #0000ff;">="saturate"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="colormatrix1"</span><span style="color: #0000ff;">/><span style="color: #800000;">feFlood </span><span style="color: #ff0000;">flood-opacity</span><span style="color: #0000ff;">="1"</span><span style="color: #ff0000;"> flood-color</span><span style="color: #0000ff;">="#3A9E00"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="flood1"</span><span style="color: #0000ff;">/><span style="color: #800000;">feBlend </span><span style="color: #ff0000;">in2</span><span style="color: #0000ff;">="colormatrix1"</span><span style="color: #ff0000;"> in</span><span style="color: #0000ff;">="flood1"</span><span style="color: #ff0000;"> mode</span><span style="color: #0000ff;">="multiply"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="blend1"</span><span style="color: #0000ff;">/><span style="color: #800000;">feBlend </span><span style="color: #ff0000;">in2</span><span style="color: #0000ff;">="blend1"</span><span style="color: #ff0000;"> mode</span><span style="color: #0000ff;">="screen"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="blend2"</span><span style="color: #0000ff;">/><span style="color: #800000;">feColorMatrix </span><span style="color: #ff0000;">in</span><span style="color: #0000ff;">="blend2"</span><span style="color: #ff0000;"> values</span><span style="color: #0000ff;">="1"</span><span style="color: #ff0000;"> type</span><span style="color: #0000ff;">="saturate"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="colormatrix2"</span><span style="color: #0000ff;">/><span style="color: #800000;">feComposite </span><span style="color: #ff0000;">in2</span><span style="color: #0000ff;">="fbSourceGraphic"</span><span style="color: #ff0000;"> in</span><span style="color: #0000ff;">="colormatrix2"</span><span style="color: #ff0000;"> operator</span><span style="color: #0000ff;">="in"</span><span style="color: #ff0000;"> result</span><span style="color: #0000ff;">="composite2"</span><span style="color: #0000ff;">/></span><span style="color: #800000;">filter</span><span style="color: #0000ff;">></span><span style="color: #800000;">defs</span><span style="color: #0000ff;">><span style="color: #800000;">ellipse </span><span style="color: #ff0000;">cx</span><span style="color: #0000ff;">="310.637"</span><span style="color: #ff0000;"> cy</span><span style="color: #0000ff;">="460.673"</span><span style="color: #ff0000;"> rx</span><span style="color: #0000ff;">="162.715"</span><span style="color: #ff0000;"> ry</span><span style="color: #0000ff;">="154.262"</span><span style="color: #ff0000;"> transform</span><span style="color: #0000ff;">="matrix(.38065 0 0 .4103 -38.244 -109.02)"</span><span style="color: #ff0000;"> fill</span><span style="color: #0000ff;">="#d3d7cf"</span><span style="color: #ff0000;"> stroke</span><span style="color: #0000ff;">="#2e3436"</span><span style="color: #ff0000;"> stroke-width</span><span style="color: #0000ff;">="30"</span><span style="color: #ff0000;"> stroke-linecap</span><span style="color: #0000ff;">="round"</span><span style="color: #ff0000;"> stroke-linejoin</span><span style="color: #0000ff;">="round"</span><span style="color: #ff0000;"> stroke-opacity</span><span style="color: #0000ff;">=".571"</span><span style="color: #ff0000;"> filter</span><span style="color: #0000ff;">="url(#a)"</span><span style="color: #0000ff;">/></span><span style="color: #800000;">svg</span><span style="color: #0000ff;">></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
Save this SVG to a local folder and name it filter-test.svg. If you want to change the color of the icon, it is very simple. Add the code to the css: filter:url(filter-test.svg#a)--- ----------------Note: There is only one filter with id a in my svg.
To summarize: the first method is tiring for designers, the icon image will be very large, and CSS control is troublesome. If it is an atlas, the displacement needs to be calculated; the second method is simple but has limited effects, such as lighting, gradients, etc. ;The third method is excellent. To add styles to icons, you only need to make an SVG filter set and then apply it through filter. It takes up less resources and is compatible as long as the browser supports SVG and filter. .
That’s it. Personally, I think the last method will gradually replace the previous one, because it is a filter that can be hung online for reuse and sharing.
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