Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-08-06 22:15:33 +01:00
Code Issues Projects Releases Packages Wiki Activity

auto merge of #5194 : hirschenberger/servo/gif_alpha_background, r=larsbergstrom

Browse source 
This is GIF specific. It's also done when the image is PNG but PNG is
handled separately with the PNG crate, whereas GIFs are handled by the
stb-image crate and the distinction between alpha and non-alpha-supporting
images was missing.
This commit is contained in:
bors-servo 2015-03-12 05:51:48 -06:00
commit 6593cf9ec4
6 changed files with 40 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

14
components/net/image/base.rs
View file

@ -59,7 +59,12 @@ pub fn load_from_memory(buffer: &[u8]) -> Option<Image> {
match stb_image::load_from_memory_with_depth(buffer, FORCE_DEPTH, true) {
stb_image::LoadResult::ImageU8(mut image) => {
assert!(image.depth == 4);
byte_swap(image.data.as_mut_slice());
// handle gif separately because the alpha-channel has to be premultiplied
if is_gif(buffer) {
byte_swap_and_premultiply(image.data.as_mut_slice());
} else {
byte_swap(image.data.as_mut_slice());
}
Some(png::Image {
width: image.width as u32,
height: image.height as u32,
@ -77,3 +82,10 @@ pub fn load_from_memory(buffer: &[u8]) -> Option<Image> {
}
}
}
fn is_gif(buffer: &[u8]) -> bool {
match buffer {
[b'G',b'I',b'F',b'8', n, b'a', ..] if n == b'7' || n == b'9' => true,
_ => false
}
}