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Reduce + recode images to JPEG if they are too huge (#3956)

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I.e. > 500K for the balanced media quality and 130K for the worse one. This can remove animation and
transparency from PNG/WebP, but then a user always can send an image as a file.

Also don't reduce wide/high images if they aren't huge. Among other benefits, this way most of PNG
screenshots aren't touched.

Also remove Exif from all images, not from JPEGs only.
This commit is contained in:
iequidoo
2023-02-21 17:55:36 -03:00
committed by iequidoo
parent 350509d5d1
commit 430a71288f
6 changed files with 178 additions and 137 deletions
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6
src/constants.rs
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@@ -192,11 +192,15 @@ pub const DC_LP_AUTH_FLAGS: i32 = DC_LP_AUTH_OAUTH2 | DC_LP_AUTH_NORMAL;
/// How many existing messages shall be fetched after configuration.
pub(crate) const DC_FETCH_EXISTING_MSGS_COUNT: i64 = 100;
// max. weight of images to send w/o recoding
pub const BALANCED_IMAGE_BYTES: usize = 500_000;
pub const WORSE_IMAGE_BYTES: usize = 130_000;
// max. width/height of an avatar
pub(crate) const BALANCED_AVATAR_SIZE: u32 = 256;
pub(crate) const WORSE_AVATAR_SIZE: u32 = 128;
// max. width/height of images
// max. width/height of images scaled down because of being too huge
pub const BALANCED_IMAGE_SIZE: u32 = 1280;
pub const WORSE_IMAGE_SIZE: u32 = 640;