| /* |
| * Copyright 2020 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 androidx.compose.ui.text.platform |
| |
| import android.content.Context |
| import android.graphics.Typeface |
| import android.util.TypedValue |
| import androidx.collection.LruCache |
| import androidx.core.content.res.ResourcesCompat |
| import androidx.compose.ui.text.font.Font |
| import androidx.compose.ui.text.font.FontFamily |
| import androidx.compose.ui.text.font.FontListFontFamily |
| import androidx.compose.ui.text.font.FontMatcher |
| import androidx.compose.ui.text.font.FontStyle |
| import androidx.compose.ui.text.font.FontSynthesis |
| import androidx.compose.ui.text.font.FontWeight |
| import androidx.compose.ui.text.font.ResourceFont |
| import androidx.ui.util.fastForEach |
| |
| /** |
| * An implementation of [AndroidTypeface] for [FontListFontFamily] |
| */ |
| // internal constructor for injecting FontMatcher for testing purpose |
| internal class AndroidFontListTypeface( |
| fontFamily: FontListFontFamily, |
| context: Context, |
| necessaryStyles: List<Pair<FontWeight, FontStyle>>? = null, |
| val fontMatcher: FontMatcher = AndroidFontListTypeface.fontMatcher |
| ) : AndroidTypeface { |
| |
| private companion object { |
| val fontMatcher = FontMatcher() |
| } |
| private val loadedTypefaces: Map<Font, Typeface> |
| |
| init { |
| val targetFonts = if (necessaryStyles == null) { |
| fontFamily.fonts |
| } else { |
| necessaryStyles.map { (weight, style) -> |
| fontMatcher.matchFont(fontFamily, weight, style) |
| }.distinct() |
| } |
| val typefaces = mutableMapOf<Font, Typeface>() |
| |
| targetFonts.fastForEach { |
| try { |
| typefaces[it] = AndroidTypefaceCache.getOrCreate(context, it) |
| } catch (e: Exception) { |
| throw IllegalStateException("Cannot create Typeface from $it") |
| } |
| } |
| |
| loadedTypefaces = typefaces |
| } |
| |
| override val fontFamily: FontFamily = fontFamily |
| |
| override fun getNativeTypeface( |
| fontWeight: FontWeight, |
| fontStyle: FontStyle, |
| synthesis: FontSynthesis |
| ): Typeface { |
| val font = fontMatcher.matchFont(loadedTypefaces.keys, fontWeight, fontStyle) |
| val typeface = loadedTypefaces.get(font) |
| requireNotNull(typeface) |
| if ((font.weight == fontWeight && font.style == fontStyle) || |
| synthesis == FontSynthesis.None) { |
| return typeface |
| } |
| return TypefaceAdapter.synthesize(typeface, font, fontWeight, fontStyle, synthesis) |
| } |
| } |
| |
| /** |
| * Global Android NativeTypeface cache. |
| */ |
| internal object AndroidTypefaceCache { |
| /** |
| * Returns NativeTypeface for [font] if it is in cache. Otherwise create new NativeTypeface and |
| * put it into internal cache. |
| */ |
| fun getOrCreate(context: Context, font: Font): Typeface = when (font) { |
| is ResourceFont -> getOrCreateByResourceId(context, font.resId) |
| else -> throw IllegalArgumentException("Unknown font type: $font") |
| } |
| |
| private val cache = LruCache<String, Typeface>(16) |
| |
| private fun getOrCreateByResourceId(context: Context, resId: Int): Typeface { |
| val value = TypedValue() |
| context.resources.getValue(resId, value, true) |
| // We use the file path as a key of the request cache. |
| val key = value.string?.toString() ?: return createTypeface(context, resId) |
| |
| cache.get(key)?.let { return it } |
| val typeface = createTypeface(context, resId) |
| cache.put(key, typeface) // eventually consistent |
| return typeface |
| } |
| |
| private fun createTypeface(context: Context, resId: Int): Typeface = |
| ResourcesCompat.getFont(context, resId) |
| ?: throw IllegalArgumentException("Unable to load Font $resId") |
| } |