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Composite semi-transparent avatars over a solid background (#3874)

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Avatars that are semi-transparent are a problem when viewing a thread,
as the line that connects different statuses in the same thread is drawn
underneath the avatar and is visible.

Fix this with a CompositeWithOpaqueBackground Glide transformation that:

1. Extracts the alpha channel from the avatar image
2. Converts the alpha to a 1bpp mask
3. Draws that mask on a new bitmap, with the appropriate background
colour
4. Draws the original bitmap on top of that

So any partially transparent areas of the original image are drawn over
a solid background colour, so anything drawn under them will not appear.
This commit is contained in:
Nik Clayton 2023-08-08 23:09:59 +02:00 • committed by GitHub
commit 4169dc34c0
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4 changed files with 194 additions and 13 deletions
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app/src/main/java/com/keylesspalace/tusky/components/conversation/ConversationViewHolder.java
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@ -144,7 +144,7 @@ public class ConversationViewHolder extends StatusBaseViewHolder {
ImageView avatarView = avatars[i];
if (i < accounts.size()) {
ImageLoadingHelper.loadAvatar(accounts.get(i).getAvatar(), avatarView,
avatarRadius48dp, statusDisplayOptions.animateAvatars());
avatarRadius48dp, statusDisplayOptions.animateAvatars(), null);
avatarView.setVisibility(View.VISIBLE);
} else {
avatarView.setVisibility(View.GONE);