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verified publisher icon dnfield

Add (some) support for blur effect

Open sroddy opened this issue 7 years ago • 47 comments

Hi, this is an SVG that we would like to be able to render using this library. friends_emoji.svg.zip

The only thing that is not visibly rendered correctly are the shadows, which use a blur effect.

@dnfield can you please take a look on the file and tell me if you see anything that at the moment can't be rendered due to current Flutter rendering limitations?

We are considering to put some of our efforts on this and fill a PR to add support.

Thank you a lot

sroddy avatar Sep 04 '18 17:09 sroddy

FilterEffects are currently unimplemented at all. In theory they should all be possible, but I haven't put much thought into how they'd work out in Flutter.

This does seem related to https://github.com/flutter/flutter/issues/13489 - although this should be a bit simpler than that one (and may even point to some help on that one). It seems like it should be possible to just apply an ImageFilter to a Paint with some changes to the engine, and that may be more performant than building a whole new layer object for it.

dnfield avatar Sep 10 '18 08:09 dnfield

So looking at this a little more, I don't think you'd even really need an ImageFilter - MaskFilter, which is already implemented, should be good enough.

dnfield avatar Sep 18 '18 05:09 dnfield

Any news on this one? Would be great to have shadows support :)

liri2006 avatar Sep 07 '19 11:09 liri2006

could you please do something about this, our app needs to use a colored svg but it is not being rendered.

rohit901 avatar Oct 06 '19 11:10 rohit901

So I can stop downloading this each time I come back here:

<svg xmlns="http://www.w3.org/2000/svg" width="95" height="108" fill="none">
  <defs>
    <filter id="filter0_d" width="53.163" height="53.297" x="41.837" y="15.748" color-interpolation-filters="sRGB" filterUnits="userSpaceOnUse">
      <feFlood flood-opacity="0" result="BackgroundImageFix"/>
      <feColorMatrix in="SourceAlpha" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0"/>
      <feOffset dx="4"/>
      <feGaussianBlur stdDeviation="4"/>
      <feColorMatrix values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0"/>
      <feBlend in2="BackgroundImageFix" result="effect1_dropShadow"/>
      <feBlend in="SourceGraphic" in2="effect1_dropShadow" result="shape"/>
    </filter>
    <filter id="filter1_d" width="62.247" height="62.414" x=".223" y="0" color-interpolation-filters="sRGB" filterUnits="userSpaceOnUse">
      <feFlood flood-opacity="0" result="BackgroundImageFix"/>
      <feColorMatrix in="SourceAlpha" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0"/>
      <feOffset dx="4"/>
      <feGaussianBlur stdDeviation="4"/>
      <feColorMatrix values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0"/>
      <feBlend in2="BackgroundImageFix" result="effect1_dropShadow"/>
      <feBlend in="SourceGraphic" in2="effect1_dropShadow" result="shape"/>
    </filter>
    <filter id="filter2_d" width="68.854" height="69.045" x="8.803" y="38.955" color-interpolation-filters="sRGB" filterUnits="userSpaceOnUse">
      <feFlood flood-opacity="0" result="BackgroundImageFix"/>
      <feColorMatrix in="SourceAlpha" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0"/>
      <feOffset dx="4"/>
      <feGaussianBlur stdDeviation="4"/>
      <feColorMatrix values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0"/>
      <feBlend in2="BackgroundImageFix" result="effect1_dropShadow"/>
      <feBlend in="SourceGraphic" in2="effect1_dropShadow" result="shape"/>
    </filter>
    <linearGradient id="paint0_linear" x1="64.418" x2="64.418" y1="23.748" y2="61.045" gradientUnits="userSpaceOnUse">
      <stop stop-color="#FFE354"/>
      <stop offset="1" stop-color="#E9C93C"/>
    </linearGradient>
    <linearGradient id="paint1_linear" x1="64.412" x2="64.412" y1="46.474" y2="50.552" gradientUnits="userSpaceOnUse">
      <stop stop-color="#fff"/>
      <stop offset="1" stop-color="#CDCDCD"/>
    </linearGradient>
    <linearGradient id="paint2_linear" x1="27.346" x2="27.346" y1="8" y2="54.414" gradientUnits="userSpaceOnUse">
      <stop stop-color="#FFE354"/>
      <stop offset="1" stop-color="#E9C93C"/>
    </linearGradient>
    <linearGradient id="paint3_linear" x1="39.23" x2="39.23" y1="46.955" y2="100" gradientUnits="userSpaceOnUse">
      <stop stop-color="#FFE354"/>
      <stop offset="1" stop-color="#E9C93C"/>
    </linearGradient>
  </defs>
  <path fill="url(#paint0_linear)" d="M64.418 61.045C74.681 61.045 83 52.695 83 42.396c0-10.299-8.32-18.648-18.582-18.648s-18.581 8.349-18.581 18.648c0 10.3 8.32 18.649 18.581 18.649z" filter="url(#filter0_d)"/>
  <path fill="#000" d="M55.45 45.474a.894.894 0 0 0-.906.835.902.902 0 0 0 .08.442 10.796 10.796 0 0 0 3.974 4.59 10.741 10.741 0 0 0 11.629 0 10.797 10.797 0 0 0 3.974-4.59.902.902 0 0 0-.826-1.277H55.45z"/>
  <path fill="url(#paint1_linear)" fill-rule="evenodd" d="M73.527 48c.25-.4.476-.817.674-1.25a.9.9 0 0 0-.826-1.276H55.45a.891.891 0 0 0-.764.41.9.9 0 0 0-.062.867c.198.432.423.85.673 1.249h18.23z" clip-rule="evenodd"/>
  <path fill="#F24E53" d="M50.482 45.643a2.329 2.329 0 0 0 2.325-2.333 2.329 2.329 0 0 0-2.325-2.333 2.329 2.329 0 0 0-2.324 2.333 2.329 2.329 0 0 0 2.324 2.333zM78.355 45.643a2.329 2.329 0 0 0 2.324-2.333 2.329 2.329 0 0 0-2.324-2.333 2.329 2.329 0 0 0-2.325 2.333 2.329 2.329 0 0 0 2.325 2.333z" opacity=".5"/>
  <path stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2.325" d="M68.482 38.495c1.994-.828 4.129-.729 6.388 0M60.351 38.495c-1.99-.828-4.129-.729-6.388 0"/>
  <path fill="url(#paint2_linear)" d="M27.346 54.414c12.771 0 23.124-10.39 23.124-23.207S40.117 8 27.346 8C14.576 8 4.223 18.39 4.223 31.207s10.352 23.207 23.123 23.207z" filter="url(#filter1_d)"/>
  <path stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2.896" d="M15.892 23.731l5.566 3.987-6.652 3.394M38.8 23.731l-5.57 3.987 6.657 3.394"/>
  <path fill="#6793FD" d="M8.17 34.675c-.948.54-2.07.683-3.123.396a4.132 4.132 0 0 1-2.494-1.927 4.157 4.157 0 0 1-.416-3.131 4.143 4.143 0 0 1 1.904-2.516c2.329-1.351 6.301-.995 8.176-.73a.85.85 0 0 1 .728.786.856.856 0 0 1-.06.38c-.705 1.76-2.386 5.39-4.715 6.742z" opacity=".8"/>
  <path stroke="#C2EDFF" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.088" d="M7.885 27.92a7.725 7.725 0 0 0-3.088.828 3.002 3.002 0 0 0-1.363 1.6" opacity=".8"/>
  <path fill="#6793FD" d="M46.498 34.675a4.119 4.119 0 0 0 5.664-1.503 4.154 4.154 0 0 0-1.535-5.675c-2.329-1.351-6.301-.995-8.176-.73a.849.849 0 0 0-.729.786.858.858 0 0 0 .06.38c.706 1.76 2.387 5.39 4.716 6.742z" opacity=".8"/>
  <path stroke="#C2EDFF" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.088" d="M46.782 27.92a7.725 7.725 0 0 1 3.09.828c.63.351 1.115.92 1.362 1.6" opacity=".8"/>
  <path fill="#000" d="M16.185 36.284a1.112 1.112 0 0 0-.944.512 1.122 1.122 0 0 0-.076 1.075 13.438 13.438 0 0 0 4.946 5.711 13.369 13.369 0 0 0 14.47 0 13.438 13.438 0 0 0 4.947-5.711 1.123 1.123 0 0 0-.483-1.453 1.112 1.112 0 0 0-.537-.134H16.185z"/>
  <path fill="#F24E53" fill-rule="evenodd" d="M33.722 44.091a10.183 10.183 0 0 0-6.376-2.225c-2.414 0-4.632.833-6.375 2.225a13.365 13.365 0 0 0 12.751 0z" clip-rule="evenodd"/>
  <path fill="url(#paint3_linear)" d="M39.23 100c14.596 0 26.427-11.874 26.427-26.522 0-14.648-11.831-26.523-26.427-26.523-14.595 0-26.427 11.875-26.427 26.523S24.635 100 39.23 100z" filter="url(#filter2_d)"/>
  <path fill="#000" d="M25.021 71.256a1.484 1.484 0 0 0-1.465 1.265c-.036.233-.016.472.057.695 2.577 7.791 8.598 13.262 15.617 13.262 7.02 0 13.036-5.466 15.613-13.262a1.497 1.497 0 0 0-.733-1.795 1.484 1.484 0 0 0-.675-.165H25.02z"/>
  <path fill="#F24E53" fill-rule="evenodd" d="M48.602 82.857a13.578 13.578 0 0 0-9.372-3.74 13.578 13.578 0 0 0-9.372 3.74c2.684 2.287 5.906 3.62 9.372 3.62 3.467 0 6.689-1.332 9.372-3.62z" clip-rule="evenodd"/>
  <path fill="#F24E53" d="M19.236 78.45a3.31 3.31 0 0 0 3.303-3.315 3.31 3.31 0 0 0-3.303-3.315 3.31 3.31 0 0 0-3.304 3.315 3.31 3.31 0 0 0 3.304 3.316zM59.225 78.45a3.31 3.31 0 0 0 3.303-3.315 3.31 3.31 0 0 0-3.303-3.315 3.31 3.31 0 0 0-3.304 3.315 3.31 3.31 0 0 0 3.304 3.316z" opacity=".5"/>
  <path stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="3.309" d="M33.45 66.018c-.587-2.395-2.396-4.144-4.543-4.144-2.147 0-3.96 1.749-4.542 4.144M54.095 66.018c-.586-2.395-2.395-4.144-4.542-4.144s-3.96 1.749-4.542 4.144"/>
</svg>

I believe everything that's needed for this is now available in the engine. Going to take another stab at it.

dnfield avatar Oct 22 '19 03:10 dnfield

Any updates about this feature?

JSBmanD avatar Dec 24 '19 20:12 JSBmanD

I started on this at one point and haven't had time to get back to it. It's not entirely simple, but should be doable.

I'd be happy to review a pr for it if someone else gets to it before me.

dnfield avatar Dec 24 '19 21:12 dnfield

Doesnt work for me either In Chrome this works perfectly and rendered with the shadow.

nflx_graph.svg.zip

szadrutsky avatar Feb 13 '20 06:02 szadrutsky

any update ?

mohammadne avatar Mar 18 '20 11:03 mohammadne

I have same issues. I need solution.

KenHoang16CDTH12 avatar May 07 '20 08:05 KenHoang16CDTH12

Any updates here?

Is there another way do draw shadow behind SVG picture in Flutter? Should I convert it to the canvas path and draw the shadow or is there any easier way? Or maybe there is another library? Thanks

alectogeek avatar Aug 08 '20 10:08 alectogeek

I started working on support for this at one point but it has a lot of quirks to support. It should be possible but I have no estimate of when.

You could do a drawShadow on the canvas below decoded svg for sure though.

dnfield avatar Aug 08 '20 15:08 dnfield

Is there another way do draw shadow behind SVG picture in Flutter?

Crappy workaround that I'm using: converting shadows to bitmap.

Whale-Street avatar Sep 01 '20 17:09 Whale-Street

I understood this issue is duplicate but please tell me when you make shadow feature in svg plugin.

rupamking1 avatar Dec 18 '20 15:12 rupamking1

I'll provide an example when I'm back at my computer :)

dnfield avatar Dec 18 '20 15:12 dnfield

Hmm. I'm realizing this might be something to add as a feature rather than expecting people to do it themselves as I work through it.

Part of the problem with supporting filter elements is that there's many many combinations that are valid and they become somewhat difficult to handle correctly outside of pretty simple cases. It's a solvable problem but not one I've had time to get to. And a couple people who really wanted this just went ahead and implemented drop shadows themselves.

I think it'd be reasonably easy to just add some kind of shadow property to the widget for people who want drop shadows though. The only thing is that may cause confusion if or when the package starts supporting filter elements that also do shadows.

dnfield avatar Dec 18 '20 17:12 dnfield

Yes your Package fans are waiting for This Feature.

rupamking1 avatar Dec 18 '20 21:12 rupamking1

If I use multiple shadow components in Svg in different area, so how flutter shadow help us ? Please use Android native is SVG plugin and joint it with your plugin and please solve Shadow problem.

rupamking1 avatar Dec 20 '20 15:12 rupamking1

Any news on that?

oguibueno avatar Mar 18 '21 15:03 oguibueno

Any updates?

gfb-47 avatar Mar 24 '21 18:03 gfb-47

I kinda solved this using Flutter Shape Maker, once my SVG wasn't working on this package, I just converted it into a flutter "draw" using this site. It worked just fine. Edit: Btw, I developed my SVG and got the code on Method Draw.

gfb-47 avatar Mar 25 '21 04:03 gfb-47

Same problem

Vasilisk7 avatar Aug 19 '21 13:08 Vasilisk7

I think flutter_svg author @dnfield never want to fix this problem.

rupamking1 avatar Aug 19 '21 13:08 rupamking1

It's not so much that I don't want to, as that it's a relatively complicated feature to properly support and I haven't had much time to get to it. I'm happy to review patches that support it.

dnfield avatar Aug 19 '21 16:08 dnfield

Hey there Thank you so much for this fabulous package. Here's what I get: Unhandled element filter; Picture key: StringPicture(String#bcac4, colorFilter: null) Since there are so many SVG assets in my project, I am not sure which of them should be replaced with the correct version of its own. Using breakpoints did not help either. My app displays this immediately upon opening in logs, but it doesn't break anything or cause a crash.

ArefMozafari avatar Sep 22 '21 07:09 ArefMozafari

Hey there Thank you so much for this fabulous package. Here's what I get: Unhandled element filter; Picture key: StringPicture(String#bcac4, colorFilter: null) Since there are so many SVG assets in my project, I am not sure which of them should be replaced with the correct version of its own. Using breakpoints did not help either. My app displays this immediately upon opening in logs, but it doesn't break anything or cause a crash.

Nothing so far?

ArefMozafari avatar Sep 26 '21 09:09 ArefMozafari

Hey everyone, I summarized all the points regarding this issue into this StackOverflow answer here.

@dnfield Thanks for the awesome plugin!

  1. I would like to ask you what your are thoughts regarding filter and effects/blur svg element support. If they are not going to be supported at all, then maybe mentioning this in Readme or something would be useful?
  2. I noticed there's a use for the filter svg element in an example within this repo: https://github.com/dnfield/flutter_svg/blob/master/example/assets/simple/width_height_viewbox.svg?short_path=99658b9#L8

om-ha avatar Oct 17 '21 12:10 om-ha

This is a feature I'd like to implement or see implemented. It's also unfortunately something I rarely have time to work on.

Some day, I will probably have time for this again. But someone else might implement it.

This is already listed as a TODO in the readme, but if there's some other way to make things clearer I don't mind.

dnfield avatar Oct 18 '21 19:10 dnfield

Sound quite reasonable. Thanks for trying to work on this in the past and sharing some ideas on how to successfully implement this.

Regarding implementing SVG Filter Effects elements in flutter_svg package, here is everything I could gather related to implementing this feature. Now I am no expert in this, but I fumbled my way around it. I think it shows how complex this feature is:

References

  • 1 What are SVG Filter Effects?
    • 1.1 [MSDN](https://developer.mozilla.org/en- US/docs/Web/SVG/Tutorial/Filter_effects)
    • 1.2 Wikipedia
  • 2 Implementing this feature is not trivial to be done efficiently.
  • 3 MaskFilter
    • 3.1 This could be used to implement this feature. As the package author suggested here and here.
    • 3.2 Official MaskFilter docs.

Points to consider

  • 4 Be ready to navigate following topics:
  • 5 Implementation ideas
    • 5.1 MaskFilter
      • 5.1.1 According to Wikipedia, SVG Filter Effects are defined as: A filter effect consists of a series of graphics operations that are applied to a given source vector graphic to produce a modified bitmapped result.
      • 5.1.2 MaskFilter as per flutter docs is defined as: A mask filter to apply to shapes as they are painted. A mask filter is a function that takes a bitmap of color pixels, and returns another bitmap of color pixels.
      • 5.1.3 Theoretically, MaskFilter can be used to convert an input bitmap representing the SVG obtained from flutter_svg, into another output bitmap by applying relevant SVG Filter Primitives depending on the specifications defined by parsed SVG. These primitives are finite so covering them should successfully implement filter element in this package.
    • 5.2 SVG Filter Effects element & CSS Filter property
      • 5.2.1 It's possible to embed SVG filter effects within CSS as demonstrated here and mentioned in this MSDN docs.
      • 5.2.2 It looks like someone in flutter engine got CSS filter effects to work for web-ui, I'm not sure what to make of this but here it is: source.
      • 5.2.3 It seems this flutter's web-ui source I just linked mentions something called Filter Effects Module Level 2 which talks about Filter Effects for SVG & CSS within the web, it might be worth checking this out for better understanding or implementation ideas. This looks like a recipe book on how to implement various Filter Effect primitive operators. There's also the older Filter Effects Module Level 1.

I think point 5.1 above is the most important one in implementing this feature.

I will try to update this comment with any new resources I come by. I could be wrong in some points so please point them out.

om-ha avatar Oct 19 '21 00:10 om-ha

Or use this widget to wrap your SvgPicture asset: https://pub.dev/packages/simple_shadow ! Works perfectly fine !

ayoubm avatar Jan 24 '22 23:01 ayoubm