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canvas: Use snapshot in canvas backends (#37863)

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This removes assumption about pixel format from backend abstraction to
actual backend implementation. This is important for vello.

Testing: WPT tests

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
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sagudev 2025-07-04 22:22:20 +02:00 • committed by GitHub
parent 8df5e1e74d
commit e1a891ea96
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10 changed files with 174 additions and 292 deletions
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13
components/script/dom/imagedata.rs
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@ -12,6 +12,7 @@ use js::gc::CustomAutoRooterGuard;
use js::jsapi::JSObject;
use js::rust::HandleObject;
use js::typedarray::{ClampedU8, Uint8ClampedArray};
use pixels::{Snapshot, SnapshotAlphaMode, SnapshotPixelFormat};
use super::bindings::buffer_source::{HeapBufferSource, create_heap_buffer_source_with_length};
use crate::dom::bindings::buffer_source::create_buffer_source;
@ -183,6 +184,18 @@ impl ImageData {
pixels::rgba8_get_rect(unsafe { self.as_slice() }, self.get_size().to_u32(), rect)
}
#[allow(unsafe_code)]
pub(crate) fn get_snapshot_rect(&self, rect: Rect<u32>) -> Snapshot {
Snapshot::from_vec(
rect.size,
SnapshotPixelFormat::RGBA,
SnapshotAlphaMode::Transparent {
premultiplied: false,
},
unsafe { self.get_rect(rect).into_owned() },
)
}
#[allow(unsafe_code)]
pub(crate) fn to_shared_memory(&self) -> IpcSharedMemory {
// This is safe because we copy the slice content