Convert svg to png but it does not render well

[swatDong]

Description

Convert svg to png but it does not render well.

Following is the code I used:

string inputSvgPath = "input.svg";
string outputPngPath = "output.png";
var svgDocument = SvgDocument.Open<SvgDocument>(inputSvgPath);
var bitmap = svgDocument.Draw();
bitmap.Save(outputPngPath, ImageFormat.Png);

Example data

SVG data:

<svg width="100" height="100" viewBox="0 0 100 100" fill="none" xmlns="http://www.w3.org/2000/svg">
<mask id="mask0" mask-type="alpha" maskUnits="userSpaceOnUse" x="0" y="0" width="100" height="100">
<path fill-rule="evenodd" clip-rule="evenodd" d="M70.9119 99.3171C72.4869 99.9307 74.2828 99.8914 75.8725 99.1264L96.4608 89.2197C98.6242 88.1787 100 85.9892 100 83.5872V16.4133C100 14.0113 98.6243 11.8218 96.4609 10.7808L75.8725 0.873756C73.7862 -0.130129 71.3446 0.11576 69.5135 1.44695C69.252 1.63711 69.0028 1.84943 68.769 2.08341L29.3551 38.0415L12.1872 25.0096C10.589 23.7965 8.35363 23.8959 6.86933 25.2461L1.36303 30.2549C-0.452552 31.9064 -0.454633 34.7627 1.35853 36.417L16.2471 50.0001L1.35853 63.5832C-0.454633 65.2374 -0.452552 68.0938 1.36303 69.7453L6.86933 74.7541C8.35363 76.1043 10.589 76.2037 12.1872 74.9905L29.3551 61.9587L68.769 97.9167C69.3925 98.5406 70.1246 99.0104 70.9119 99.3171ZM75.0152 27.2989L45.1091 50.0001L75.0152 72.7012V27.2989Z" fill="white"/>
</mask>
<g mask="url(#mask0)">
<path d="M96.4614 10.7962L75.8569 0.875542C73.4719 -0.272773 70.6217 0.211611 68.75 2.08333L1.29858 63.5832C-0.515693 65.2373 -0.513607 68.0937 1.30308 69.7452L6.81272 74.754C8.29793 76.1042 10.5347 76.2036 12.1338 74.9905L93.3609 13.3699C96.086 11.3026 100 13.2462 100 16.6667V16.4275C100 14.0265 98.6246 11.8378 96.4614 10.7962Z" fill="#0065A9"/>
<g filter="url(#filter0_d)">
<path d="M96.4614 89.2038L75.8569 99.1245C73.4719 100.273 70.6217 99.7884 68.75 97.9167L1.29858 36.4169C-0.515693 34.7627 -0.513607 31.9063 1.30308 30.2548L6.81272 25.246C8.29793 23.8958 10.5347 23.7964 12.1338 25.0095L93.3609 86.6301C96.086 88.6974 100 86.7538 100 83.3334V83.5726C100 85.9735 98.6246 88.1622 96.4614 89.2038Z" fill="#007ACC"/>
</g>
<g filter="url(#filter1_d)">
<path d="M75.8578 99.1263C73.4721 100.274 70.6219 99.7885 68.75 97.9166C71.0564 100.223 75 98.5895 75 95.3278V4.67213C75 1.41039 71.0564 -0.223106 68.75 2.08329C70.6219 0.211402 73.4721 -0.273666 75.8578 0.873633L96.4587 10.7807C98.6234 11.8217 100 14.0112 100 16.4132V83.5871C100 85.9891 98.6234 88.1786 96.4586 89.2196L75.8578 99.1263Z" fill="#1F9CF0"/>
</g>
<g style="mix-blend-mode:overlay" opacity="0.25">
<path fill-rule="evenodd" clip-rule="evenodd" d="M70.8511 99.3171C72.4261 99.9306 74.2221 99.8913 75.8117 99.1264L96.4 89.2197C98.5634 88.1787 99.9392 85.9892 99.9392 83.5871V16.4133C99.9392 14.0112 98.5635 11.8217 96.4001 10.7807L75.8117 0.873695C73.7255 -0.130191 71.2838 0.115699 69.4527 1.44688C69.1912 1.63705 68.942 1.84937 68.7082 2.08335L29.2943 38.0414L12.1264 25.0096C10.5283 23.7964 8.29285 23.8959 6.80855 25.246L1.30225 30.2548C-0.513334 31.9064 -0.515415 34.7627 1.29775 36.4169L16.1863 50L1.29775 63.5832C-0.515415 65.2374 -0.513334 68.0937 1.30225 69.7452L6.80855 74.754C8.29285 76.1042 10.5283 76.2036 12.1264 74.9905L29.2943 61.9586L68.7082 97.9167C69.3317 98.5405 70.0638 99.0104 70.8511 99.3171ZM74.9544 27.2989L45.0483 50L74.9544 72.7012V27.2989Z" fill="url(#paint0_linear)"/>
</g>
</g>
<defs>
<filter id="filter0_d" x="-8.39411" y="15.8291" width="116.727" height="92.2456" filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">
<feFlood flood-opacity="0" result="BackgroundImageFix"/>
<feColorMatrix in="SourceAlpha" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0"/>
<feOffset/>
<feGaussianBlur stdDeviation="4.16667"/>
<feColorMatrix type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.25 0"/>
<feBlend mode="overlay" in2="BackgroundImageFix" result="effect1_dropShadow"/>
<feBlend mode="normal" in="SourceGraphic" in2="effect1_dropShadow" result="shape"/>
</filter>
<filter id="filter1_d" x="60.4167" y="-8.07558" width="47.9167" height="116.151" filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">
<feFlood flood-opacity="0" result="BackgroundImageFix"/>
<feColorMatrix in="SourceAlpha" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0"/>
<feOffset/>
<feGaussianBlur stdDeviation="4.16667"/>
<feColorMatrix type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.25 0"/>
<feBlend mode="overlay" in2="BackgroundImageFix" result="effect1_dropShadow"/>
<feBlend mode="normal" in="SourceGraphic" in2="effect1_dropShadow" result="shape"/>
</filter>
<linearGradient id="paint0_linear" x1="49.9392" y1="0.257812" x2="49.9392" y2="99.7423" gradientUnits="userSpaceOnUse">
<stop stop-color="white"/>
<stop offset="1" stop-color="white" stop-opacity="0"/>
</linearGradient>
</defs>
</svg>

Used Versions

NuGet package: Svg.3.0.20-g594db9696a

Screen Shots

Before (SVG):

After (PNG):

[mrbean-bremen]

Most filters (including feFlood and feBlend) are not supported yet (see #43). I started to add some support for feFlood and feBlend some time ago, but got stuck - not sure when I (or hopefully someone else who knows more about image processing) will add this.