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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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17
components/script/messaging.rs
View file

@ -16,7 +16,7 @@ use crossbeam_channel::{Receiver, SendError, Sender, select};
use devtools_traits::{DevtoolScriptControlMsg, ScriptToDevtoolsControlMsg};
use ipc_channel::ipc::IpcSender;
use net_traits::FetchResponseMsg;
use net_traits::image_cache::PendingImageResponse;
use net_traits::image_cache::ImageCacheResponseMessage;
use profile_traits::mem::{self as profile_mem, OpaqueSender, ReportsChan};
use profile_traits::time::{self as profile_time};
use script_traits::{Painter, ScriptThreadMessage};
@ -40,7 +40,7 @@ pub(crate) enum MixedMessage {
FromConstellation(ScriptThreadMessage),
FromScript(MainThreadScriptMsg),
FromDevtools(DevtoolScriptControlMsg),
FromImageCache(PendingImageResponse),
FromImageCache(ImageCacheResponseMessage),
#[cfg(feature = "webgpu")]
FromWebGPUServer(WebGPUMsg),
TimerFired,
@ -104,7 +104,14 @@ impl MixedMessage {
MainThreadScriptMsg::Inactive => None,
MainThreadScriptMsg::WakeUp => None,
},
MixedMessage::FromImageCache(response) => Some(response.pipeline_id),
MixedMessage::FromImageCache(response) => match response {
ImageCacheResponseMessage::NotifyPendingImageLoadStatus(response) => {
Some(response.pipeline_id)
},
ImageCacheResponseMessage::VectorImageRasterizationComplete(response) => {
Some(response.pipeline_id)
},
},
MixedMessage::FromDevtools(_) | MixedMessage::TimerFired => None,
#[cfg(feature = "webgpu")]
MixedMessage::FromWebGPUServer(..) => None,
@ -326,7 +333,7 @@ pub(crate) struct ScriptThreadSenders {
/// messages on this channel are routed to crossbeam [`Sender`] on the router thread, which
/// in turn sends messages to [`ScriptThreadReceivers::image_cache_receiver`].
#[no_trace]
pub(crate) image_cache_sender: IpcSender<PendingImageResponse>,
pub(crate) image_cache_sender: IpcSender<ImageCacheResponseMessage>,
/// For providing contact with the time profiler.
#[no_trace]
@ -355,7 +362,7 @@ pub(crate) struct ScriptThreadReceivers {
/// The [`Receiver`] which receives incoming messages from the `ImageCache`.
#[no_trace]
pub(crate) image_cache_receiver: Receiver<PendingImageResponse>,
pub(crate) image_cache_receiver: Receiver<ImageCacheResponseMessage>,
/// For receiving commands from an optional devtools server. Will be ignored if no such server
/// exists. When devtools are not active this will be [`crossbeam_channel::never()`].