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Make HTMLCanvasElement::fetch_all_data return a shared memory blob

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This commit is contained in:
Anthony Ramine 2018-11-21 12:51:49 +01:00
parent 804d964b7d
commit 9a8d03a0f3
5 changed files with 21 additions and 23 deletions
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6
components/script/dom/canvasrenderingcontext2d.rs
View file

@ -1296,7 +1296,11 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
.ok_or(Error::InvalidState)?
},
CanvasImageSource::HTMLCanvasElement(ref canvas) => {
canvas.fetch_all_data().ok_or(Error::InvalidState)?
let (data, size) = canvas.fetch_all_data().ok_or(Error::InvalidState)?;
let data = data
.map(|data| data.to_vec())
.unwrap_or_else(|| vec![0; size.area() as usize * 4]);
(data, size)
},
CanvasImageSource::CSSStyleValue(ref value) => value
.get_url(self.base_url.clone())

7
components/script/dom/htmlcanvaselement.rs
View file

@ -36,6 +36,7 @@ use euclid::{Rect, Size2D};
use html5ever::{LocalName, Prefix};
use image::png::PNGEncoder;
use image::ColorType;
use ipc_channel::ipc::IpcSharedMemory;
use js::error::throw_type_error;
use js::jsapi::JSContext;
use js::rust::HandleValue;
@ -280,7 +281,7 @@ impl HTMLCanvasElement {
self.Height() != 0 && self.Width() != 0
}
pub fn fetch_all_data(&self) -> Option<(Vec<u8>, Size2D<u32>)> {
pub fn fetch_all_data(&self) -> Option<(Option<IpcSharedMemory>, Size2D<u32>)> {
let size = self.get_size();
if size.width == 0 || size.height == 0 {
@ -297,7 +298,7 @@ impl HTMLCanvasElement {
);
context.get_ipc_renderer().send(msg).unwrap();
receiver.recv().unwrap()?.into()
Some(receiver.recv().unwrap())
},
Some(&CanvasContext::WebGL(_)) => {
// TODO: add a method in WebGLRenderingContext to get the pixels.
@ -307,7 +308,7 @@ impl HTMLCanvasElement {
// TODO: add a method in WebGL2RenderingContext to get the pixels.
return None;
},
None => vec![0; size.height as usize * size.width as usize * 4],
None => None,
};
Some((data, size))

10
components/script/dom/webglrenderingcontext.rs
View file

@ -569,12 +569,10 @@ impl WebGLRenderingContext {
return Err(Error::Security);
}
if let Some((data, size)) = canvas.fetch_all_data() {
TexPixels::new(
IpcSharedMemory::from_bytes(&data),
size,
PixelFormat::BGRA8,
true,
)
let data = data.unwrap_or_else(|| {
IpcSharedMemory::from_bytes(&vec![0; size.area() as usize * 4])
});
TexPixels::new(data, size, PixelFormat::BGRA8, true)
} else {
return Ok(None);
}