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/*
* Copyright (C) 2014 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.graphics;
import android.annotation.Nullable;
import android.content.res.AssetManager;
import android.graphics.fonts.FontVariationAxis;
import android.text.FontConfig;
import android.text.TextUtils;
import android.util.Log;
import dalvik.annotation.optimization.CriticalNative;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* A family of typefaces with different styles.
*
* @hide
*/
public class FontFamily {
private static String TAG = "FontFamily";
/**
* @hide
*/
public long mNativePtr;
// Points native font family builder. Must be zero after freezing this family.
private long mBuilderPtr;
public FontFamily() {
mBuilderPtr = nInitBuilder(null, 0);
}
public FontFamily(@Nullable String[] langs, int variant) {
final String langsString;
if (langs == null || langs.length == 0) {
langsString = null;
} else if (langs.length == 1) {
langsString = langs[0];
} else {
langsString = TextUtils.join(",", langs);
}
mBuilderPtr = nInitBuilder(langsString, variant);
}
/**
* Finalize the FontFamily creation.
*
* @return boolean returns false if some error happens in native code, e.g. broken font file is
* passed, etc.
*/
public boolean freeze() {
if (mBuilderPtr == 0) {
throw new IllegalStateException("This FontFamily is already frozen");
}
mNativePtr = nCreateFamily(mBuilderPtr);
mBuilderPtr = 0;
return mNativePtr != 0;
}
public void abortCreation() {
if (mBuilderPtr == 0) {
throw new IllegalStateException("This FontFamily is already frozen or abandoned");
}
nAbort(mBuilderPtr);
mBuilderPtr = 0;
}
@Override
protected void finalize() throws Throwable {
try {
if (mNativePtr != 0) {
nUnrefFamily(mNativePtr);
}
if (mBuilderPtr != 0) {
nAbort(mBuilderPtr);
}
} finally {
super.finalize();
}
}
public boolean addFont(String path, int ttcIndex, FontVariationAxis[] axes, int weight,
int italic) {
if (mBuilderPtr == 0) {
throw new IllegalStateException("Unable to call addFont after freezing.");
}
try (FileInputStream file = new FileInputStream(path)) {
FileChannel fileChannel = file.getChannel();
long fontSize = fileChannel.size();
ByteBuffer fontBuffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, 0, fontSize);
if (axes != null) {
for (FontVariationAxis axis : axes) {
nAddAxisValue(mBuilderPtr, axis.getOpenTypeTagValue(), axis.getStyleValue());
}
}
return nAddFont(mBuilderPtr, fontBuffer, ttcIndex, weight, italic);
} catch (IOException e) {
Log.e(TAG, "Error mapping font file " + path);
return false;
}
}
public boolean addFontFromBuffer(ByteBuffer font, int ttcIndex, FontVariationAxis[] axes,
int weight, int italic) {
if (mBuilderPtr == 0) {
throw new IllegalStateException("Unable to call addFontWeightStyle after freezing.");
}
if (axes != null) {
for (FontVariationAxis axis : axes) {
nAddAxisValue(mBuilderPtr, axis.getOpenTypeTagValue(), axis.getStyleValue());
}
}
return nAddFontWeightStyle(mBuilderPtr, font, ttcIndex, weight, italic);
}
/**
* @param mgr The AssetManager to use for this context.
* @param path The path to the font file to load.
* @param cookie If available, the resource cookie given by Resources.
* @param isAsset {@code true} if this is from the assets/ folder, {@code false} if from
* resources
* @param weight The weight of the font. If 0 is given, the weight and italic will be resolved
* using the OS/2 table in the font.
* @param isItalic Whether this font is italic. If the weight is set to 0, this will be resolved
* using the OS/2 table in the font.
* @return
*/
public boolean addFontFromAssetManager(AssetManager mgr, String path, int cookie,
boolean isAsset, int ttcIndex, int weight, int isItalic,
FontVariationAxis[] axes) {
if (mBuilderPtr == 0) {
throw new IllegalStateException("Unable to call addFontFromAsset after freezing.");
}
if (axes != null) {
for (FontVariationAxis axis : axes) {
nAddAxisValue(mBuilderPtr, axis.getOpenTypeTagValue(), axis.getStyleValue());
}
}
return nAddFontFromAssetManager(mBuilderPtr, mgr, path, cookie, isAsset, ttcIndex, weight,
isItalic);
}
/**
* Allow creating unsupported FontFamily.
*
* For compatibility reasons, we still need to create a FontFamily object even if Minikin failed
* to find any usable 'cmap' table for some reasons, e.g. broken 'cmap' table, no 'cmap' table
* encoded with Unicode code points, etc. Without calling this method, the freeze() method will
* return null if Minikin fails to find any usable 'cmap' table. By calling this method, the
* freeze() won't fail and will create an empty FontFamily. This empty FontFamily is placed at
* the top of the fallback chain but is never used. if we don't create this empty FontFamily
* and put it at top, bad things (performance regressions, unexpected glyph selection) will
* happen.
*/
public void allowUnsupportedFont() {
if (mBuilderPtr == 0) {
throw new IllegalStateException("Unable to allow unsupported font.");
}
nAllowUnsupportedFont(mBuilderPtr);
}
// TODO: Remove once internal user stop using private API.
private static boolean nAddFont(long builderPtr, ByteBuffer font, int ttcIndex) {
return nAddFont(builderPtr, font, ttcIndex, -1, -1);
}
private static native long nInitBuilder(String langs, int variant);
@CriticalNative
private static native long nCreateFamily(long mBuilderPtr);
@CriticalNative
private static native void nAllowUnsupportedFont(long builderPtr);
@CriticalNative
private static native void nAbort(long mBuilderPtr);
@CriticalNative
private static native void nUnrefFamily(long nativePtr);
// By passing -1 to weigth argument, the weight value is resolved by OS/2 table in the font.
// By passing -1 to italic argument, the italic value is resolved by OS/2 table in the font.
private static native boolean nAddFont(long builderPtr, ByteBuffer font, int ttcIndex,
int weight, int isItalic);
private static native boolean nAddFontWeightStyle(long builderPtr, ByteBuffer font,
int ttcIndex, int weight, int isItalic);
private static native boolean nAddFontFromAssetManager(long builderPtr, AssetManager mgr,
String path, int cookie, boolean isAsset, int ttcIndex, int weight, int isItalic);
// The added axis values are only valid for the next nAddFont* method call.
@CriticalNative
private static native void nAddAxisValue(long builderPtr, int tag, float value);
}
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