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Add support for static SVG images using resvg crate (#36721)

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This change adds support for rendering static SVG images using the
`resvg` crate, allowing svg sources in the `img` tag and in CSS
`background` and `content` properties. There are some limitations in
using resvg:

1. There is no support for animations or interactivity as these would
require implementing the full DOM layer of SVG specification.
2. Only system fonts can be used for text rendering. There is some
mechanism to provide a custom font resolver to usvg, but that is not
explored in this change.
3. resvg's handling of certain edge cases involving lack of explicit
`width` and `height` on the root svg element deviates from what the
specification expects from browsers. For example, resvg uses the values
in `viewBox` to derive the missing width or height dimension, but
without scaling that dimension to preserve the aspect ratio. It also
doesn't allow overriding this behavior.

Demo screenshot:
![servo - resvg
img](https://github.com/user-attachments/assets/8ecb2de2-ab7c-48e2-9f08-2d09d2cb8791)

<details>
<summary>Source</summary>

```
<style>
 #svg1 {
   border: 1px solid red;
 }

 #svg2 {
   border: 1px solid red;
   width: 300px;
 }
 #svg3 {
   border: 1px solid red;
   width: 300px;
   height: 200px;
   object-fit: contain;
 }
 #svg4 {
   border: 1px solid red;
   width: 300px;
   height: 200px;
   object-fit: cover;
 }
 #svg5 {
   border: 1px solid red;
   width: 300px;
   height: 200px;
   object-fit: fill;
 }
 #svg6 {
   border: 1px solid red;
   width: 300px;
   height: 200px;
   object-fit: none;
 }
</style>
</head>
<body>
        <div>
          <img id="svg1" src="https://raw.githubusercontent.com/servo/servo/refs/heads/main/resources/servo.svg" alt="Servo logo">
        </div>
        <div>
          <img id="svg2" src="https://raw.githubusercontent.com/servo/servo/refs/heads/main/resources/servo.svg" alt="Servo logo">
          <img id="svg3" src="https://raw.githubusercontent.com/servo/servo/refs/heads/main/resources/servo.svg" alt="Servo logo">
          <img id="svg4" src="https://raw.githubusercontent.com/servo/servo/refs/heads/main/resources/servo.svg" alt="Servo logo">
        </div>
        <div>
          <img id="svg5" src="https://raw.githubusercontent.com/servo/servo/refs/heads/main/resources/servo.svg" alt="Servo logo">
          <img id="svg6" src="https://raw.githubusercontent.com/servo/servo/refs/heads/main/resources/servo.svg" alt="Servo logo">
        </div>
</body>
```

</details>

---------

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Mukilan Thiyagarajan 2025-05-27 16:32:40 +05:30 • committed by GitHub
parent 324196351e
commit 8a20e42de4
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267 changed files with 2374 additions and 544 deletions
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3
tests/wpt/meta/html/semantics/embedded-content/the-img-element/current-pixel-density/basic.html.ini vendored
View file

@ -1,7 +1,4 @@
[basic.html]
[<img srcset="data:image/svg+xml,<svg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='-1%20-1%202%202'%20width='20'%20height='20'><circle%20r='1'/></svg> 2x" data-expect="10">]
expected: FAIL
[<img srcset="data:image/svg+xml,<svg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='-1%20-1%202%202'%20width='20'><circle%20r='1'/></svg> 2x" data-expect="10">]
expected: FAIL

6
tests/wpt/meta/html/semantics/embedded-content/the-img-element/decode/image-decode-path-changes.html.ini vendored
View file

@ -7,3 +7,9 @@
[HTMLImageElement.prototype.decode(), src/srcset mutation tests. srcset changes fail decode; following good decode succeeds.]
expected: FAIL
[HTMLImageElement.prototype.decode(), src/srcset mutation tests. src changes fail decode.]
expected: FAIL
[HTMLImageElement.prototype.decode(), src/srcset mutation tests. srcset changes fail decode.]
expected: FAIL

3
tests/wpt/meta/html/semantics/embedded-content/the-img-element/decode/image-decode-picture.html.ini vendored
View file

@ -1,3 +0,0 @@
[image-decode-picture.html]
[HTMLImageElement.prototype.decode(), picture tests. Image with SVG source decodes with undefined.]
expected: FAIL

6
tests/wpt/meta/html/semantics/embedded-content/the-img-element/decode/image-decode.html.ini vendored
View file

@ -1,6 +0,0 @@
[image-decode.html]
[HTMLImageElement.prototype.decode(), basic tests. Image with SVG src decodes with undefined.]
expected: FAIL
[HTMLImageElement.prototype.decode(), basic tests. Image with SVG srcset decodes with undefined.]
expected: FAIL

12
tests/wpt/meta/html/semantics/embedded-content/the-img-element/naturalWidth-naturalHeight.html.ini vendored
View file

@ -1,18 +1,18 @@
[naturalWidth-naturalHeight.html]
[HTMLImageElement.prototype.naturalWidth/naturalHeight, SVG image, width/height in pixels]
expected: FAIL
[HTMLImageElement.prototype.naturalWidth/naturalHeight, SVG image, width in pixels; height unspecified]
expected: FAIL
[HTMLImageElement.prototype.naturalWidth/naturalHeight, SVG image, width in pixels; percentage height]
expected: FAIL
[HTMLImageElement.prototype.naturalWidth/naturalHeight, SVG image, width/height in pixels; viewBox]
expected: FAIL
[HTMLImageElement.prototype.naturalWidth/naturalHeight, SVG image, width in pixels; height unspecified; viewBox]
expected: FAIL
[HTMLImageElement.prototype.naturalWidth/naturalHeight, SVG image, width unspecified; height in pixels; viewBox]
expected: FAIL
[HTMLImageElement.prototype.naturalWidth/naturalHeight, SVG image, no natural dimensions]
expected: FAIL
[HTMLImageElement.prototype.naturalWidth/naturalHeight, SVG image, width/height unspecified; viewBox]
expected: FAIL