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Premultiply RGBA image data before sending to webrender

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This commit is contained in:
Jamie Nicol 2017-02-28 13:04:20 +00:00 • committed by Glenn Watson
parent ee223798cc
commit ec3142e811
4 changed files with 21 additions and 0 deletions
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18
components/net/image_cache_thread.rs
View file

@ -336,6 +336,21 @@ fn get_placeholder_image(webrender_api: &webrender_traits::RenderApi) -> io::Res
Ok(Arc::new(image))
}
fn premultiply(data: &mut [u8]) {
let length = data.len();
for i in (0..length).step_by(4) {
let b = data[i + 0] as u32;
let g = data[i + 1] as u32;
let r = data[i + 2] as u32;
let a = data[i + 3] as u32;
data[i + 0] = (b * a / 255) as u8;
data[i + 1] = (g * a / 255) as u8;
data[i + 2] = (r * a / 255) as u8;
}
}
impl ImageCache {
fn run(webrender_api: webrender_traits::RenderApi,
ipc_command_receiver: IpcReceiver<ImageCacheCommand>) {
@ -484,6 +499,9 @@ impl ImageCache {
let format = convert_format(image.format);
let mut bytes = Vec::new();
bytes.extend_from_slice(&*image.bytes);
if format == webrender_traits::ImageFormat::RGBA8 {
premultiply(bytes.as_mut_slice());
}
let descriptor = webrender_traits::ImageDescriptor {
width: image.width,
height: image.height,

1
components/net/lib.rs
View file

@ -5,6 +5,7 @@
#![deny(unsafe_code)]
#![feature(box_syntax)]
#![feature(mpsc_select)]
#![feature(step_by)]
extern crate brotli;
extern crate cookie as cookie_rs;

1
tests/wpt/mozilla/tests/mozilla/webgl/tex_image_2d_mipmap.html
View file

@ -106,6 +106,7 @@
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_NEAREST);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
gl.generateMipmap(gl.TEXTURE_2D);

1
tests/wpt/mozilla/tests/mozilla/webgl/tex_image_2d_simple.html
View file

@ -106,6 +106,7 @@
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
gl.drawArrays(gl.TRIANGLES, 0, 6);