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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.text;
import android.annotation.NonNull;
import java.util.Collections;
import java.util.Set;
/**
* The set of emoji that should be drawn by the system with the default font for device consistency.
*
* This is intended to be used only by applications that do custom emoji rendering using tools like
* {@link android.text.style.ReplacementSpan} or custom emoji fonts.
*
* An example of how this should be used:
*
* <p>
* <ol>
* <li>
* Match emoji for third party custom rendering
* </li>
* <li>
* For each match, check against NonStandardEmoji before displaying custom glyph
* </li>
* <li>
* If in NonStandardEmojiSet, do not display custom glyph (render with
* android.graphics.Typeface.DEFAULT instead)
* </li>
* <li>
* Otherwise, do custom rendering like normal
* </li>
* </ol>
* </p>
*/
public final class EmojiConsistency {
/* Cannot construct */
private EmojiConsistency() { }
/**
* The set of emoji that should be drawn by the system with the default font for device
* consistency.
*
* Apps SHOULD attempt to avoid overwriting system emoji rendering with custom emoji glyphs for
* these codepoint sequences.
*
* Apps that display custom emoji glyphs via matching code may filter against this set. On
* match, the application SHOULD prefer Typeface.Default instead of a custom glyph
*
* Apps that use fonts may use this set to add {@link android.text.style.TypefaceSpan} for
* android.graphics.Typeface.DEFAULT for matched codepoint sequences.
*
* Codepoint sequences returned MUST match exactly to be considered a match with the exception
* of Variation Selectors.
*
* All codepoint sequences returned MUST be a complete emoji codepoint sequence as defined by
* unicode.
*
* @return set of codepoint sequences representing codepoints that should be rendered by the
* system using the default font.
*/
@NonNull
public static Set<int[]> getEmojiConsistencySet() {
return Collections.emptySet();
}
}
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