Improve system emoji rendering across the app with EmojiCompat2.

Resolves #13327

app/src/main/java/org/thoughtcrime/securesms/components/emoji/EmojiEditText.java

@@ -42,11 +42,10 @@ public class EmojiEditText extends AppCompatEditText {
     super(context, attrs, defStyleAttr);
 
     TypedArray a           = context.getTheme().obtainStyledAttributes(attrs, R.styleable.EmojiTextView, 0, 0);
-    boolean    forceCustom = a.getBoolean(R.styleable.EmojiTextView_emoji_forceCustom, false);
     boolean    jumboEmoji  = a.getBoolean(R.styleable.EmojiTextView_emoji_forceJumbo, false);
     a.recycle();
 
-    if (!isInEditMode() && (forceCustom || !SignalStore.settings().isPreferSystemEmoji())) {
+    if (!isInEditMode() && !SignalStore.settings().isPreferSystemEmoji()) {
       setFilters(appendEmojiFilter(this.getFilters(), jumboEmoji));
       setEmojiCompatEnabled(false);
     }

app/src/main/java/org/thoughtcrime/securesms/components/emoji/EmojiProvider.java

@@ -23,6 +23,7 @@ import org.thoughtcrime.securesms.components.emoji.parsing.EmojiParser;
 import org.thoughtcrime.securesms.emoji.EmojiPageCache;
 import org.thoughtcrime.securesms.emoji.EmojiSource;
 import org.thoughtcrime.securesms.emoji.JumboEmoji;
+import org.thoughtcrime.securesms.keyvalue.SignalStore;
 import org.thoughtcrime.securesms.util.DeviceProperties;
 import org.thoughtcrime.securesms.util.FutureTaskListener;
 
@@ -121,6 +122,10 @@ public class EmojiProvider {
       return null;
     }
 
+    if (SignalStore.settings().isPreferSystemEmoji()) {
+      return new SystemEmojiDrawable(drawInfo.getEmoji());
+    }
+
     final int           lowMemoryDecodeScale = DeviceProperties.isLowMemoryDevice(context) ? 2 : 1;
     final EmojiSource   source               = EmojiSource.getLatest();
     final EmojiDrawable drawable             = new EmojiDrawable(source, drawInfo, lowMemoryDecodeScale);
@@ -202,6 +207,10 @@ public class EmojiProvider {
       return null;
     }
 
+    if (SignalStore.settings().isPreferSystemEmoji()) {
+      return new SystemEmojiDrawable(drawInfo.getEmoji());
+    }
+
     final int           lowMemoryDecodeScale = DeviceProperties.isLowMemoryDevice(context) ? 2 : 1;
     final EmojiSource   source               = EmojiSource.getLatest();
     final EmojiDrawable drawable             = new EmojiDrawable(source, drawInfo, lowMemoryDecodeScale);

app/src/main/java/org/thoughtcrime/securesms/components/emoji/EmojiTextView.java

@@ -57,7 +57,6 @@ public class EmojiTextView extends AppCompatTextView {
   private static final char  ELLIPSIS        = '…';
   private static final float JUMBOMOJI_SCALE = 0.8f;
 
-  private boolean                forceCustom;
   private CharSequence           previousText;
   private BufferType             previousBufferType;
   private TransformationMethod   previousTransformationMethod;
@@ -93,7 +92,6 @@ public class EmojiTextView extends AppCompatTextView {
     TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.EmojiTextView, 0, 0);
     scaleEmojis     = a.getBoolean(R.styleable.EmojiTextView_scaleEmojis, false);
     maxLength       = a.getInteger(R.styleable.EmojiTextView_emoji_maxLength, -1);
-    forceCustom     = a.getBoolean(R.styleable.EmojiTextView_emoji_forceCustom, false);
     renderMentions  = a.getBoolean(R.styleable.EmojiTextView_emoji_renderMentions, true);
     measureLastLine = a.getBoolean(R.styleable.EmojiTextView_measureLastLine, false);
     forceJumboEmoji = a.getBoolean(R.styleable.EmojiTextView_emoji_forceJumbo, false);
@@ -445,7 +443,7 @@ public class EmojiTextView extends AppCompatTextView {
   }
 
   private boolean useSystemEmoji() {
-    return isInEditMode() || (!forceCustom && SignalStore.settings().isPreferSystemEmoji());
+    return isInEditMode() || SignalStore.settings().isPreferSystemEmoji();
   }
 
   @Override

app/src/main/java/org/thoughtcrime/securesms/components/emoji/SystemEmojiDrawable.kt

@@ -0,0 +1,69 @@
+package org.thoughtcrime.securesms.components.emoji
+
+import android.graphics.Canvas
+import android.graphics.ColorFilter
+import android.graphics.Matrix
+import android.graphics.PixelFormat
+import android.graphics.Rect
+import android.graphics.RectF
+import android.graphics.drawable.Drawable
+import android.os.Build
+import android.text.Layout
+import android.text.StaticLayout
+import android.text.TextPaint
+import androidx.core.graphics.toRectF
+import androidx.core.graphics.withMatrix
+import androidx.emoji2.text.EmojiCompat
+
+/**
+ * [Drawable] that renders an emoji via the system font for available glyphs and EmojiCompat for
+ * missing glyphs.
+ */
+class SystemEmojiDrawable(emoji: CharSequence) : Drawable() {
+
+  private val emojiLayout: StaticLayout = getStaticLayout(getProcessedEmoji(emoji))
+  private val transform: Matrix = Matrix()
+
+  override fun onBoundsChange(bounds: Rect) {
+    super.onBoundsChange(bounds)
+    transform.setRectToRect(emojiLayout.getBounds(), bounds.toRectF(), Matrix.ScaleToFit.CENTER)
+  }
+
+  override fun draw(canvas: Canvas) {
+    canvas.withMatrix(transform) {
+      emojiLayout.draw(canvas)
+    }
+  }
+
+  override fun setAlpha(alpha: Int) {}
+
+  override fun setColorFilter(colorFilter: ColorFilter?) {}
+
+  @Deprecated(
+    "Deprecated in Java",
+    ReplaceWith("PixelFormat.TRANSLUCENT", "android.graphics.PixelFormat")
+  )
+  override fun getOpacity(): Int = PixelFormat.TRANSLUCENT
+
+  companion object {
+    private val textPaint: TextPaint = TextPaint()
+
+    private fun getStaticLayout(emoji: CharSequence): StaticLayout =
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        StaticLayout.Builder.obtain(emoji, 0, emoji.length, textPaint, Int.MAX_VALUE).build()
+      } else {
+        @Suppress("DEPRECATION")
+        StaticLayout(emoji, textPaint, Int.MAX_VALUE, Layout.Alignment.ALIGN_NORMAL, 0f, 0f, true)
+      }
+
+    private fun getProcessedEmoji(emoji: CharSequence): CharSequence =
+      try {
+        EmojiCompat.get().process(emoji) ?: emoji
+      } catch (e: IllegalStateException) {
+        emoji
+      }
+
+    private fun StaticLayout.getBounds(): RectF =
+      RectF(getLineLeft(0), 0f, getLineRight(0), getLineDescent(0) - getLineAscent(0).toFloat())
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/components/emoji/parsing/EmojiDrawInfo.kt

@@ -2,4 +2,4 @@ package org.thoughtcrime.securesms.components.emoji.parsing
 
 import org.thoughtcrime.securesms.emoji.EmojiPage
 
-data class EmojiDrawInfo(val page: EmojiPage, val index: Int, private val emoji: String, val rawEmoji: String?, val jumboSheet: String?)
+data class EmojiDrawInfo(val page: EmojiPage, val index: Int, val emoji: String, val rawEmoji: String?, val jumboSheet: String?)