hayyaksi 75607c73ec Keep transparency when an image is shared into the app with an imprecise mime type (#7452) ...

* Resolve the real image format before choosing the encoder

The upload pre-processor picks the encoder from the mime type it is
given. When an image is shared from another app that type is often
broader than the image really is, so a transparent PNG shared as a
wildcard image type is re-encoded as JPEG and its alpha channel is
flattened to black.

Read the format from the image header when the declared type is not
already a concrete PNG or JPEG, and use that to decide both whether the
image can be compressed at all and which encoder to use.

* Cover the mime type fallbacks the wildcard resolution introduced

resolveImageMimeType now decides whether an image is compressible, so two of
its outcomes had no test: a GIF shared with a wildcard type has to be
recognised and left uncompressed rather than recompressed into a still, and a
file the decoder cannot read at all has to fall back to the type it was shared
with.

The isMimeTypeImage() guard on the decoded type is dropped with them. The
BitmapFactory decoders only ever report an image type in outMimeType, so the
guard could not fire and there was no way to exercise it.

2026-08-17 21:08:48 +02:00

..

src

Keep transparency when an image is shared into the app with an imprecise mime type (#7452)

2026-08-17 21:08:48 +02:00

build.gradle.kts

Use the right video preset when sharing videos (#5892)

2025-12-16 16:40:44 +01:00