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Handle toDataURL with no context

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This commit is contained in:
David Zbarsky 2015-11-28 16:09:00 -08:00
parent da8952b702
commit 84ec9c4266
3 changed files with 41 additions and 39 deletions
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62
components/script/dom/htmlcanvaselement.rs
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@ -258,39 +258,45 @@ impl HTMLCanvasElementMethods for HTMLCanvasElement {
_mime_type: Option<DOMString>,
_arguments: Vec<HandleValue>) -> Fallible<DOMString> {
// Step 1.
if let Some(CanvasContext::Context2d(ref context)) = *self.context.borrow() {
// Step 1.
if !context.origin_is_clean() {
return Err(Error::Security);
}
// Step 2.
if self.Width() == 0 || self.Height() == 0 {
return Ok(DOMString::from("data:,"));
}
// Step 3.
let window = window_from_node(self);
let image_data = try!(context.GetImageData(Finite::wrap(0f64), Finite::wrap(0f64),
Finite::wrap(self.Width() as f64),
Finite::wrap(self.Height() as f64)));
let raw_data = image_data.get_data_array(&GlobalRef::Window(window.r()));
// Only handle image/png for now.
let mime_type = "image/png";
let mut encoded = Vec::new();
{
let encoder: PNGEncoder<&mut Vec<u8>> = PNGEncoder::new(&mut encoded);
encoder.encode(&raw_data, self.Width(), self.Height(), ColorType::RGBA(8)).unwrap();
}
let encoded = encoded.to_base64(STANDARD);
Ok(DOMString::from(format!("data:{};base64,{}", mime_type, encoded)))
} else {
Err(Error::NotSupported)
}
// Step 2.
if self.Width() == 0 || self.Height() == 0 {
return Ok(DOMString::from("data:,"));
}
// Step 3.
let raw_data = match *self.context.borrow() {
Some(CanvasContext::Context2d(ref context)) => {
let window = window_from_node(self);
let image_data = try!(context.GetImageData(Finite::wrap(0f64), Finite::wrap(0f64),
Finite::wrap(self.Width() as f64),
Finite::wrap(self.Height() as f64)));
image_data.get_data_array(&GlobalRef::Window(window.r()))
}
None => {
// Each pixel is fully-transparent black.
vec![0; (self.Width() * self.Height() * 4) as usize]
}
_ => return Err(Error::NotSupported) // WebGL
};
// Only handle image/png for now.
let mime_type = "image/png";
let mut encoded = Vec::new();
{
let encoder: PNGEncoder<&mut Vec<u8>> = PNGEncoder::new(&mut encoded);
encoder.encode(&raw_data, self.Width(), self.Height(), ColorType::RGBA(8)).unwrap();
}
let encoded = encoded.to_base64(STANDARD);
Ok(DOMString::from(format!("data:{};base64,{}", mime_type, encoded)))
}
}