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Abstract some stuff common to ctx.getImageData and ctx.putImageData

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This commit is contained in:
Anthony Ramine 2018-10-08 11:09:38 +02:00
parent e62dbabb46
commit 77c28bdfc9
4 changed files with 97 additions and 147 deletions
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27
components/canvas/canvas_data.rs
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@ -441,24 +441,20 @@ impl<'a> CanvasData<'a> {
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-putimagedata
pub fn put_image_data(
&mut self,
mut imagedata: Vec<u8>,
offset: Vector2D<i32>,
imagedata_size: Size2D<i32>,
) {
assert_eq!(imagedata_size.area() * 4, imagedata.len() as i32);
pub fn put_image_data(&mut self, mut imagedata: Vec<u8>, rect: Rect<u32>) {
assert_eq!(imagedata.len() % 4, 0);
assert_eq!(rect.size.area() as usize, imagedata.len() / 4);
pixels::byte_swap_and_premultiply_inplace(&mut imagedata);
let source_surface = self.drawtarget.create_source_surface_from_data(
&imagedata,
imagedata_size,
imagedata_size.width * 4,
rect.size.to_i32(),
rect.size.width as i32 * 4,
SurfaceFormat::B8G8R8A8,
).unwrap();
self.drawtarget.copy_surface(
source_surface,
Rect::from_size(imagedata_size),
offset.to_point(),
Rect::from_size(rect.size.to_i32()),
rect.origin.to_i32(),
);
}
@ -517,14 +513,11 @@ impl<'a> CanvasData<'a> {
/// canvas_size: The size of the canvas we're reading from
/// read_rect: The area of the canvas we want to read from
#[allow(unsafe_code)]
pub fn read_pixels(&self, read_rect: Rect<i32>, canvas_size: Size2D<i32>) -> Vec<u8> {
pub fn read_pixels(&self, read_rect: Rect<u32>, canvas_size: Size2D<u32>) -> Vec<u8> {
let canvas_rect = Rect::from_size(canvas_size);
let src_read_rect = canvas_rect.intersection(&read_rect).unwrap_or(Rect::zero());
if src_read_rect.is_empty() || canvas_size.width <= 0 && canvas_size.height <= 0 {
return vec![];
if canvas_rect.intersection(&read_rect).map_or(true, |rect| rect.is_empty()) {
return vec![];
}
let data_surface = self.drawtarget.snapshot().get_data_surface();
pixels::get_rect(unsafe { data_surface.data() }, canvas_size.to_u32(), read_rect.to_u32()).into_owned()
}