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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 com.android.ide.common.rendering.api.LayoutLog;
import com.android.layoutlib.bridge.Bridge;
import com.android.layoutlib.bridge.impl.DelegateManager;
import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
import java.awt.Font;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import static android.graphics.Typeface_Delegate.SYSTEM_FONTS;
/**
* Delegate implementing the native methods of android.graphics.FontFamily
*
* Through the layoutlib_create tool, the original native methods of FontFamily have been replaced
* by calls to methods of the same name in this delegate class.
*
* This class behaves like the original native implementation, but in Java, keeping previously
* native data into its own objects and mapping them to int that are sent back and forth between
* it and the original FontFamily class.
*
* @see DelegateManager
*/
public class FontFamily_Delegate {
// FONT_SUFFIX_ITALIC will always match FONT_SUFFIX_BOLDITALIC and hence it must be checked
// separately.
private static final String FONT_SUFFIX_BOLDITALIC = "BoldItalic.ttf";
private static final String FONT_SUFFIX_BOLD = "Bold.ttf";
private static final String FONT_SUFFIX_ITALIC = "Italic.ttf";
private static final String FONT_SUBSTRING_COMPACT = "UI";
/**
* A class associating {@link Font} with its metadata.
*/
private static final class FontInfo {
Font mFont;
/** Regular, Bold, Italic, or BoldItalic. */
int mStyle;
/**
* The variant of the Font - compact or elegant.
* @see Paint#setElegantTextHeight(boolean)
*/
boolean mIsCompact;
}
// ---- delegate manager ----
private static final DelegateManager<FontFamily_Delegate> sManager =
new DelegateManager<FontFamily_Delegate>(FontFamily_Delegate.class);
// ---- delegate helper data ----
private static String sFontLocation;
private static final List<FontFamily_Delegate> sPostInitDelegate = new
ArrayList<FontFamily_Delegate>();
// ---- delegate data ----
private List<FontInfo> mFonts = new ArrayList<FontInfo>();
// Path of fonts that haven't been created since sFontLoader hasn't been initialized.
private List<String> mPath = new ArrayList<String>();
// ---- Public Helper methods ----
public static FontFamily_Delegate getDelegate(long nativeFontFamily) {
return sManager.getDelegate(nativeFontFamily);
}
public static synchronized void setFontLocation(String fontLocation) {
sFontLocation = fontLocation;
for (FontFamily_Delegate fontFamily : sPostInitDelegate) {
fontFamily.init();
}
sPostInitDelegate.clear();
}
public Font getFont(int style, boolean isCompact) {
FontInfo plainFont = null;
FontInfo styledFont = null; // Font matching the style but not isCompact
for (FontInfo font : mFonts) {
if (font.mStyle == style) {
if (font.mIsCompact == isCompact) {
return font.mFont;
}
styledFont = font;
}
if (font.mStyle == Font.PLAIN) {
if (plainFont == null) {
plainFont = font;
continue;
}
if (font.mIsCompact == isCompact) {
// Override the previous selection of plain font since we've found a better one.
plainFont = font;
}
}
}
if (styledFont != null) {
return styledFont.mFont;
}
// No font with the mentioned style is found. Try to derive one.
if (plainFont != null && style > 0 && style < 4) {
styledFont = new FontInfo();
styledFont.mFont = plainFont.mFont.deriveFont(style);
styledFont.mStyle = style;
styledFont.mIsCompact = plainFont.mIsCompact;
// Add the font to the list of fonts so that we don't have to derive it the next time.
mFonts.add(styledFont);
return styledFont.mFont;
}
return null;
}
// ---- native methods ----
@LayoutlibDelegate
/*package*/ static long nCreateFamily() {
FontFamily_Delegate delegate = new FontFamily_Delegate();
if (sFontLocation != null) {
delegate.init();
} else {
sPostInitDelegate.add(delegate);
}
return sManager.addNewDelegate(delegate);
}
@LayoutlibDelegate
/*package*/ static void nUnrefFamily(long nativePtr) {
sManager.removeJavaReferenceFor(nativePtr);
}
@LayoutlibDelegate
/*package*/ static boolean nAddFont(long nativeFamily, String path) {
FontFamily_Delegate delegate = getDelegate(nativeFamily);
if (delegate != null) {
if (sFontLocation == null) {
delegate.mPath.add(path);
return true;
}
return delegate.addFont(path);
}
return false;
}
private void init() {
for (String path : mPath) {
addFont(path);
}
mPath = null;
}
private boolean addFont(String path) {
Font font = loadFont(path);
if (font == null) {
return false;
}
FontInfo fontInfo = new FontInfo();
fontInfo.mFont = font;
addFontMetadata(fontInfo, path);
// TODO ensure that mFonts doesn't have the font with this style already.
mFonts.add(fontInfo);
return true;
}
private static void addFontMetadata(FontInfo fontInfo, String path) {
int style = Font.PLAIN;
String fontName = path.substring(path.lastIndexOf('/'), path.length());
if (fontName.endsWith(FONT_SUFFIX_BOLDITALIC)) {
style = Font.BOLD | Font.ITALIC;
} else if (fontName.endsWith(FONT_SUFFIX_BOLD)) {
style = Font.BOLD;
} else if (fontName.endsWith(FONT_SUFFIX_ITALIC)) {
style = Font.ITALIC;
}
fontInfo.mStyle = style;
// Names of compact fonts end with UI-<style>.ttf. For example, NotoNakshUI-Regular.ttf.
// This should go away when this info is passed on by nAddFont().
int hyphenIndex = fontName.lastIndexOf('-');
fontInfo.mIsCompact = hyphenIndex > 0 &&
fontName.substring(0, hyphenIndex).endsWith(FONT_SUBSTRING_COMPACT);
}
private static Font loadFont(String path) {
if (path.startsWith(SYSTEM_FONTS) ) {
String relativePath = path.substring(SYSTEM_FONTS.length());
File f = new File(sFontLocation, relativePath);
try {
return Font.createFont(Font.TRUETYPE_FONT, f);
} catch (Exception e) {
Bridge.getLog().fidelityWarning(LayoutLog.TAG_BROKEN,
String.format("Unable to load font %1$s", relativePath),
null /*throwable*/, null /*data*/);
}
} else {
Bridge.getLog().fidelityWarning(LayoutLog.TAG_UNSUPPORTED,
"Only platform fonts located in " + SYSTEM_FONTS + "can be loaded.",
null /*throwable*/, null /*data*/);
}
return null;
}
}
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