don't load custom emojis in their full size (#4429)

This should save quite some memory, but most importantly it gets rid of
this crash:

```
java.lang.RuntimeException: Canvas: trying to draw too large(121969936bytes) bitmap.
           at android.graphics.RecordingCanvas.throwIfCannotDraw(RecordingCanvas.java:266)
           at android.graphics.BaseRecordingCanvas.drawBitmap(BaseRecordingCanvas.java:94)
           at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:549)
           at com.keylesspalace.tusky.util.EmojiSpan.draw(CustomEmojiHelper.kt:131)
           ...
```

app/src/main/java/com/keylesspalace/tusky/adapter/FollowRequestViewHolder.kt

@@ -16,7 +16,7 @@
 package com.keylesspalace.tusky.adapter
 
 import android.graphics.Typeface
-import android.text.SpannableStringBuilder
+import android.text.SpannableString
 import android.text.Spanned
 import android.text.style.StyleSpan
 import androidx.recyclerview.widget.RecyclerView
@@ -49,7 +49,7 @@ class FollowRequestViewHolder(
         val wrappedName = account.name.unicodeWrap()
         val emojifiedName: CharSequence = wrappedName.emojify(
             account.emojis,
-            itemView,
+            binding.displayNameTextView,
             animateEmojis
         )
         binding.displayNameTextView.text = emojifiedName
@@ -58,9 +58,9 @@ class FollowRequestViewHolder(
                 R.string.notification_follow_request_format,
                 wrappedName
             )
-            binding.notificationTextView.text = SpannableStringBuilder(wholeMessage).apply {
+            binding.notificationTextView.text = SpannableString(wholeMessage).apply {
                 setSpan(StyleSpan(Typeface.BOLD), 0, wrappedName.length, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
-            }.emojify(account.emojis, itemView, animateEmojis)
+            }.emojify(account.emojis, binding.notificationTextView, animateEmojis)
         }
         binding.notificationTextView.visible(showHeader)
         val formattedUsername = itemView.context.getString(

app/src/main/java/com/keylesspalace/tusky/adapter/ReportNotificationViewHolder.kt

@@ -39,16 +39,9 @@ class ReportNotificationViewHolder(
         animateAvatar: Boolean,
         animateEmojis: Boolean
     ) {
-        val reporterName = reporter.name.unicodeWrap().emojify(
-            reporter.emojis,
-            itemView,
-            animateEmojis
-        )
-        val reporteeName = report.targetAccount.name.unicodeWrap().emojify(
-            report.targetAccount.emojis,
-            itemView,
-            animateEmojis
-        )
+        val reporterName = reporter.name.unicodeWrap().emojify(reporter.emojis, binding.notificationTopText, animateEmojis)
+        val reporteeName = report.targetAccount.name.unicodeWrap().emojify(report.targetAccount.emojis, binding.notificationTopText, animateEmojis)
+
         val icon = ContextCompat.getDrawable(itemView.context, R.drawable.ic_flag_24dp)
 
         binding.notificationTopText.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null)

app/src/main/java/com/keylesspalace/tusky/components/announcements/AnnouncementAdapter.kt

@@ -37,7 +37,6 @@ import com.keylesspalace.tusky.util.emojify
 import com.keylesspalace.tusky.util.parseAsMastodonHtml
 import com.keylesspalace.tusky.util.setClickableText
 import com.keylesspalace.tusky.util.visible
-import java.lang.ref.WeakReference
 
 interface AnnouncementActionListener : LinkListener {
     fun openReactionPicker(announcementId: String, target: View)
@@ -111,7 +110,7 @@ class AnnouncementAdapter(
                         // we set the EmojiSpan on a space, because otherwise the Chip won't have the right size
                         // https://github.com/tuskyapp/Tusky/issues/2308
                         val spanBuilder = SpannableStringBuilder("  ${reaction.count}")
-                        val span = EmojiSpan(WeakReference(this))
+                        val span = EmojiSpan(this)
                         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                             span.contentDescription = reaction.name
                         }

app/src/main/java/com/keylesspalace/tusky/util/CustomEmojiHelper.kt

@@ -24,10 +24,12 @@ import android.graphics.drawable.Drawable
 import android.text.SpannableStringBuilder
 import android.text.style.ReplacementSpan
 import android.view.View
+import android.widget.TextView
 import com.bumptech.glide.Glide
 import com.bumptech.glide.request.target.CustomTarget
 import com.bumptech.glide.request.target.Target
 import com.bumptech.glide.request.transition.Transition
+import com.keylesspalace.tusky.R
 import com.keylesspalace.tusky.entity.Emoji
 import java.lang.ref.WeakReference
 import java.util.regex.Pattern
@@ -51,7 +53,7 @@ fun CharSequence.emojify(emojis: List<Emoji>, view: View, animate: Boolean): Cha
             .matcher(this)
 
         while (matcher.find()) {
-            val span = EmojiSpan(WeakReference(view))
+            val span = EmojiSpan(view)
 
             builder.setSpan(span, matcher.start(), matcher.end(), 0)
             Glide.with(view)
@@ -69,7 +71,19 @@ fun CharSequence.emojify(emojis: List<Emoji>, view: View, animate: Boolean): Cha
     return builder
 }
 
-class EmojiSpan(val viewWeakReference: WeakReference<View>) : ReplacementSpan() {
+class EmojiSpan(view: View) : ReplacementSpan() {
+
+    private val viewWeakReference = WeakReference(view)
+
+    private val emojiSize: Int = if (view is TextView) {
+        view.paint.textSize
+    } else {
+        // sometimes it is not possible to determine the TextView the emoji will be shown in,
+        // e.g. because it is passed to a library, so we fallback to a size that should be large
+        // enough in most cases
+        view.context.resources.getDimension(R.dimen.fallback_emoji_size)
+    }.times(1.2).toInt()
+
     var imageDrawable: Drawable? = null
 
     override fun getSize(
@@ -89,7 +103,7 @@ class EmojiSpan(val viewWeakReference: WeakReference<View>) : ReplacementSpan()
             fm.bottom = metrics.bottom
         }
 
-        return (paint.textSize * 1.2).toInt()
+        return emojiSize
     }
 
     override fun draw(
@@ -134,7 +148,7 @@ class EmojiSpan(val viewWeakReference: WeakReference<View>) : ReplacementSpan()
     }
 
     fun getTarget(animate: Boolean): Target<Drawable> {
-        return object : CustomTarget<Drawable>() {
+        return object : CustomTarget<Drawable>(emojiSize, emojiSize) {
             override fun onResourceReady(resource: Drawable, transition: Transition<in Drawable>?) {
                 viewWeakReference.get()?.let { view ->
                     if (animate && resource is Animatable) {

app/src/main/java/com/keylesspalace/tusky/util/LinkHelper.kt

@@ -48,7 +48,6 @@ import com.keylesspalace.tusky.R
 import com.keylesspalace.tusky.entity.HashTag
 import com.keylesspalace.tusky.entity.Status.Mention
 import com.keylesspalace.tusky.interfaces.LinkListener
-import java.lang.ref.WeakReference
 import java.net.URI
 import java.net.URISyntaxException
 
@@ -128,7 +127,7 @@ fun markupHiddenUrls(view: TextView, content: CharSequence): SpannableStringBuil
 
         val linkDrawable = AppCompatResources.getDrawable(view.context, R.drawable.ic_link)!!
         // ImageSpan does not always align the icon correctly in the line, let's use our custom emoji span for this
-        val linkDrawableSpan = EmojiSpan(WeakReference(view))
+        val linkDrawableSpan = EmojiSpan(view)
         linkDrawableSpan.imageDrawable = linkDrawable
 
         val placeholderIndex = replacementText.indexOf("🔗")

app/src/main/res/values/dimens.xml

@@ -75,4 +75,6 @@
 
     <dimen name="account_swiperefresh_distance">64dp</dimen>
 
+    <dimen name="fallback_emoji_size">16sp</dimen>
+
 </resources>