Layoutlib now parses system_fonts.xml instead of its own.

Also parse fallback_fonts.
This lets layoutlib automatically use the same fonts as the base
platforms, for instance it now uses the new ICS fonts.

Change-Id: Id6e778dc0e3f2a9112601e0eaf8499a9713ec433

2 files changed, 135 insertions, 179 deletions

diff --git a/tools/layoutlib/bridge/src/android/graphics/Typeface_Delegate.java b/tools/layoutlib/bridge/src/android/graphics/Typeface_Delegate.java
index 0f084f7..dd14355 100644
--- a/tools/layoutlib/bridge/src/android/graphics/Typeface_Delegate.java
+++ b/tools/layoutlib/bridge/src/android/graphics/Typeface_Delegate.java
@@ -26,7 +26,6 @@ import android.content.res.AssetManager;
 
 import java.awt.Font;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 
 /**
@@ -50,7 +49,6 @@ public final class Typeface_Delegate {
 
     // ---- delegate helper data ----
     private static final String DEFAULT_FAMILY = "sans-serif";
-    private static final int[] STYLE_BUFFER = new int[1];
 
     private static FontLoader sFontLoader;
     private static final List<Typeface_Delegate> sPostInitDelegate =
@@ -178,14 +176,6 @@ public final class Typeface_Delegate {
     }
 
     private void init() {
-        STYLE_BUFFER[0] = mStyle;
-        Font font = sFontLoader.getFont(mFamily, STYLE_BUFFER);
-        if (font != null) {
-            List<Font> list = new ArrayList<Font>();
-            list.add(font);
-            list.addAll(sFontLoader.getFallBackFonts());
-            mFonts = Collections.unmodifiableList(list);
-            mStyle = STYLE_BUFFER[0];
-        }
+        mFonts = sFontLoader.getFont(mFamily, mStyle);
     }
 }
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/FontLoader.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/FontLoader.java
index f62fad2..0d1ba7c 100644
--- a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/FontLoader.java
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/impl/FontLoader.java
@@ -23,17 +23,13 @@ import org.xml.sax.helpers.DefaultHandler;
 import android.graphics.Typeface;
 
 import java.awt.Font;
-import java.awt.FontFormatException;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
 
 import javax.xml.parsers.ParserConfigurationException;
@@ -47,49 +43,53 @@ import javax.xml.parsers.SAXParserFactory;
  * fonts.xml file located alongside the ttf files.
  */
 public final class FontLoader {
-    private static final String FONTS_DEFINITIONS = "fonts.xml";
+    private static final String FONTS_SYSTEM = "system_fonts.xml";
+    private static final String FONTS_VENDOR = "vendor_fonts.xml";
+    private static final String FONTS_FALLBACK = "fallback_fonts.xml";
 
-    private static final String NODE_FONTS = "fonts";
-    private static final String NODE_FONT = "font";
+    private static final String NODE_FAMILYSET = "familyset";
+    private static final String NODE_FAMILY = "family";
     private static final String NODE_NAME = "name";
-    private static final String NODE_FALLBACK = "fallback";
-
-    private static final String ATTR_TTF = "ttf";
-
-    private static final String FONT_EXT = ".ttf";
-
-    private static final String[] FONT_STYLE_DEFAULT = { "", "-Regular" };
-    private static final String[] FONT_STYLE_BOLD = { "-Bold" };
-    private static final String[] FONT_STYLE_ITALIC = { "-Italic" };
-    private static final String[] FONT_STYLE_BOLDITALIC = { "-BoldItalic" };
-
-    // list of font style, in the order matching the Typeface Font style
-    private static final String[][] FONT_STYLES = {
-        FONT_STYLE_DEFAULT,
-        FONT_STYLE_BOLD,
-        FONT_STYLE_ITALIC,
-        FONT_STYLE_BOLDITALIC
+    private static final String NODE_FILE = "file";
+
+    private static final String FONT_SUFFIX_NONE = ".ttf";
+    private static final String FONT_SUFFIX_REGULAR = "-Regular.ttf";
+    private static final String FONT_SUFFIX_BOLD = "-Bold.ttf";
+    private static final String FONT_SUFFIX_ITALIC = "-Italic.ttf";
+    private static final String FONT_SUFFIX_BOLDITALIC = "-BoldItalic.ttf";
+
+    // This must match the values of Typeface styles so that we can use them for indices in this
+    // array.
+    private static final int[] AWT_STYLES = new int[] {
+        Font.PLAIN,
+        Font.BOLD,
+        Font.ITALIC,
+        Font.BOLD | Font.ITALIC
     };
+    private static int[] DERIVE_BOLD_ITALIC = new int[] {
+        Typeface.ITALIC, Typeface.BOLD, Typeface.NORMAL
+    };
+    private static int[] DERIVE_ITALIC = new int[] { Typeface.NORMAL };
+    private static int[] DERIVE_BOLD = new int[] { Typeface.NORMAL };
 
-    private final Map<String, String> mFamilyToTtf = new HashMap<String, String>();
-    private final Map<String, Map<Integer, Font>> mTtfToFontMap =
-        new HashMap<String, Map<Integer, Font>>();
-
-    private List<Font> mFallBackFonts = null;
+    private static final List<FontInfo> mMainFonts = new ArrayList<FontInfo>();
+    private static final List<FontInfo> mFallbackFonts = new ArrayList<FontInfo>();
 
     public static FontLoader create(String fontOsLocation) {
         try {
             SAXParserFactory parserFactory = SAXParserFactory.newInstance();
                 parserFactory.setNamespaceAware(true);
 
-            SAXParser parser = parserFactory.newSAXParser();
-            File f = new File(fontOsLocation + File.separator + FONTS_DEFINITIONS);
+            // parse the system fonts
+            FontHandler handler = parseFontFile(parserFactory, fontOsLocation, FONTS_SYSTEM);
+            List<FontInfo> systemFonts = handler.getFontList();
+
 
-            FontDefinitionParser definitionParser = new FontDefinitionParser(
-                    fontOsLocation + File.separator);
-            parser.parse(new FileInputStream(f), definitionParser);
+            // parse the fallback fonts
+            handler = parseFontFile(parserFactory, fontOsLocation, FONTS_FALLBACK);
+            List<FontInfo> fallbackFonts = handler.getFontList();
 
-            return definitionParser.getFontLoader();
+            return new FontLoader(systemFonts, fallbackFonts);
         } catch (ParserConfigurationException e) {
             // return null below
         } catch (SAXException e) {
@@ -103,35 +103,22 @@ public final class FontLoader {
         return null;
     }
 
-    private FontLoader(List<FontInfo> fontList, List<String> fallBackList) {
-        for (FontInfo info : fontList) {
-            for (String family : info.families) {
-                mFamilyToTtf.put(family, info.ttf);
-            }
-        }
+    private static FontHandler parseFontFile(SAXParserFactory parserFactory,
+            String fontOsLocation, String fontFileName)
+            throws ParserConfigurationException, SAXException, IOException, FileNotFoundException {
 
-        ArrayList<Font> list = new ArrayList<Font>();
-        for (String path : fallBackList) {
-            File f = new File(path + FONT_EXT);
-            if (f.isFile()) {
-                try {
-                    Font font = Font.createFont(Font.TRUETYPE_FONT, f);
-                    if (font != null) {
-                        list.add(font);
-                    }
-                } catch (FontFormatException e) {
-                    // skip this font name
-                } catch (IOException e) {
-                    // skip this font name
-                }
-            }
-        }
+        SAXParser parser = parserFactory.newSAXParser();
+        File f = new File(fontOsLocation, fontFileName);
 
-        mFallBackFonts = Collections.unmodifiableList(list);
+        FontHandler definitionParser = new FontHandler(
+                fontOsLocation + File.separator);
+        parser.parse(new FileInputStream(f), definitionParser);
+        return definitionParser;
     }
 
-    public List<Font> getFallBackFonts() {
-        return mFallBackFonts;
+    private FontLoader(List<FontInfo> fontList, List<FontInfo> fallBackList) {
+        mMainFonts.addAll(fontList);
+        mFallbackFonts.addAll(fallBackList);
     }
 
     /**
@@ -143,96 +130,32 @@ public final class FontLoader {
      *              the method returns.
      * @return the font object or null if no match could be found.
      */
-    public synchronized Font getFont(String family, int[] style) {
-        if (family == null) {
-            return null;
-        }
-
-        // get the ttf name from the family
-        String ttf = mFamilyToTtf.get(family);
-
-        if (ttf == null) {
-            return null;
-        }
-
-        // get the font from the ttf
-        Map<Integer, Font> styleMap = mTtfToFontMap.get(ttf);
+    public synchronized List<Font> getFont(String family, int style) {
+        List<Font> result = new ArrayList<Font>();
 
-        if (styleMap == null) {
-            styleMap = new HashMap<Integer, Font>();
-            mTtfToFontMap.put(ttf, styleMap);
+        if (family == null) {
+            return result;
         }
 
-        Font f = styleMap.get(style[0]);
-
-        if (f != null) {
-            return f;
-        }
 
-        // if it doesn't exist, we create it, and we can't, we try with a simpler style
-        switch (style[0]) {
-            case Typeface.NORMAL:
-                f = getFont(ttf, FONT_STYLES[Typeface.NORMAL]);
-                break;
-            case Typeface.BOLD:
-            case Typeface.ITALIC:
-                f = getFont(ttf, FONT_STYLES[style[0]]);
-                if (f == null) {
-                    f = getFont(ttf, FONT_STYLES[Typeface.NORMAL]);
-                    style[0] = Typeface.NORMAL;
-                }
-                break;
-            case Typeface.BOLD_ITALIC:
-                f = getFont(ttf, FONT_STYLES[style[0]]);
-                if (f == null) {
-                    f = getFont(ttf, FONT_STYLES[Typeface.BOLD]);
-                    if (f != null) {
-                        style[0] = Typeface.BOLD;
-                    } else {
-                        f = getFont(ttf, FONT_STYLES[Typeface.ITALIC]);
-                        if (f != null) {
-                            style[0] = Typeface.ITALIC;
-                        } else {
-                            f = getFont(ttf, FONT_STYLES[Typeface.NORMAL]);
-                            style[0] = Typeface.NORMAL;
-                        }
-                    }
-                }
+        // get the font objects from the main list based on family.
+        for (FontInfo info : mMainFonts) {
+            if (info.families.contains(family)) {
+                result.add(info.font[style]);
                 break;
+            }
         }
 
-        if (f != null) {
-            styleMap.put(style[0], f);
-            return f;
+        // add all the fallback fonts
+        for (FontInfo info : mFallbackFonts) {
+            result.add(info.font[style]);
         }
 
-        return null;
-    }
-
-    private Font getFont(String ttf, String[] fontFileSuffix) {
-        for (String suffix : fontFileSuffix) {
-            String name = ttf + suffix + FONT_EXT;
-
-            File f = new File(name);
-            if (f.isFile()) {
-                try {
-                    Font font = Font.createFont(Font.TRUETYPE_FONT, f);
-                    if (font != null) {
-                        return font;
-                    }
-                } catch (FontFormatException e) {
-                    // skip this font name
-                } catch (IOException e) {
-                    // skip this font name
-                }
-            }
-        }
-
-        return null;
+        return result;
     }
 
     private final static class FontInfo {
-        String ttf;
+        final Font[] font = new Font[4]; // Matches the 4 type-face styles.
         final Set<String> families;
 
         FontInfo() {
@@ -240,21 +163,20 @@ public final class FontLoader {
         }
     }
 
-    private final static class FontDefinitionParser extends DefaultHandler {
+    private final static class FontHandler extends DefaultHandler {
         private final String mOsFontsLocation;
 
         private FontInfo mFontInfo = null;
         private final StringBuilder mBuilder = new StringBuilder();
-        private List<FontInfo> mFontList;
-        private List<String> mFallBackList;
+        private List<FontInfo> mFontList = new ArrayList<FontInfo>();
 
-        private FontDefinitionParser(String osFontsLocation) {
+        private FontHandler(String osFontsLocation) {
             super();
             mOsFontsLocation = osFontsLocation;
         }
 
-        FontLoader getFontLoader() {
-            return new FontLoader(mFontList, mFallBackList);
+        public List<FontInfo> getFontList() {
+            return mFontList;
         }
 
         /* (non-Javadoc)
@@ -263,26 +185,11 @@ public final class FontLoader {
         @Override
         public void startElement(String uri, String localName, String name, Attributes attributes)
                 throws SAXException {
-            if (NODE_FONTS.equals(localName)) {
+            if (NODE_FAMILYSET.equals(localName)) {
                 mFontList = new ArrayList<FontInfo>();
-                mFallBackList = new ArrayList<String>();
-            } else if (NODE_FONT.equals(localName)) {
+            } else if (NODE_FAMILY.equals(localName)) {
                 if (mFontList != null) {
-                    String ttf = attributes.getValue(ATTR_TTF);
-                    if (ttf != null) {
-                        mFontInfo = new FontInfo();
-                        mFontInfo.ttf = mOsFontsLocation + ttf;
-                        mFontList.add(mFontInfo);
-                    }
-                }
-            } else if (NODE_NAME.equals(localName)) {
-                // do nothing, we'll handle the name in the endElement
-            } else if (NODE_FALLBACK.equals(localName)) {
-                if (mFallBackList != null) {
-                    String ttf = attributes.getValue(ATTR_TTF);
-                    if (ttf != null) {
-                        mFallBackList.add(mOsFontsLocation + ttf);
-                    }
+                    mFontInfo = new FontInfo();
                 }
             }
 
@@ -304,19 +211,78 @@ public final class FontLoader {
          */
         @Override
         public void endElement(String uri, String localName, String name) throws SAXException {
-            if (NODE_FONTS.equals(localName)) {
-                // top level, do nothing
-            } else if (NODE_FONT.equals(localName)) {
-                mFontInfo = null;
+            if (NODE_FAMILY.equals(localName)) {
+                if (mFontInfo != null) {
+                    // if has a normal font file, add to the list
+                    if (mFontInfo.font[Typeface.NORMAL] != null) {
+                        mFontList.add(mFontInfo);
+
+                        // create missing font styles, order is important.
+                        if (mFontInfo.font[Typeface.BOLD_ITALIC] == null) {
+                            computeDerivedFont(Typeface.BOLD_ITALIC, DERIVE_BOLD_ITALIC);
+                        }
+                        if (mFontInfo.font[Typeface.ITALIC] == null) {
+                            computeDerivedFont(Typeface.ITALIC, DERIVE_ITALIC);
+                        }
+                        if (mFontInfo.font[Typeface.BOLD] == null) {
+                            computeDerivedFont(Typeface.BOLD, DERIVE_BOLD);
+                        }
+                    }
+
+                    mFontInfo = null;
+                }
             } else if (NODE_NAME.equals(localName)) {
                 // handle a new name for an existing Font Info
                 if (mFontInfo != null) {
                     String family = trimXmlWhitespaces(mBuilder.toString());
                     mFontInfo.families.add(family);
                 }
-            } else if (NODE_FALLBACK.equals(localName)) {
-                // nothing to do here.
+            } else if (NODE_FILE.equals(localName)) {
+                // handle a new file for an existing Font Info
+                if (mFontInfo != null) {
+                    String fileName = trimXmlWhitespaces(mBuilder.toString());
+                    Font font = getFont(fileName);
+                    if (font != null) {
+                        if (fileName.endsWith(FONT_SUFFIX_REGULAR)) {
+                            mFontInfo.font[Typeface.NORMAL] = font;
+                        } else if (fileName.endsWith(FONT_SUFFIX_BOLD)) {
+                            mFontInfo.font[Typeface.BOLD] = font;
+                        } else if (fileName.endsWith(FONT_SUFFIX_ITALIC)) {
+                            mFontInfo.font[Typeface.ITALIC] = font;
+                        } else if (fileName.endsWith(FONT_SUFFIX_BOLDITALIC)) {
+                            mFontInfo.font[Typeface.BOLD_ITALIC] = font;
+                        } else if (fileName.endsWith(FONT_SUFFIX_NONE)) {
+                            mFontInfo.font[Typeface.NORMAL] = font;
+                        }
+                    }
+                }
+            }
+        }
+
+        private Font getFont(String fileName) {
+            try {
+                File file = new File(mOsFontsLocation, fileName);
+                if (file.exists()) {
+                    return Font.createFont(Font.TRUETYPE_FONT, file);
+                }
+            } catch (Exception e) {
+
             }
+
+            return null;
+        }
+
+        private void computeDerivedFont( int toCompute, int[] basedOnList) {
+            for (int basedOn : basedOnList) {
+                if (mFontInfo.font[basedOn] != null) {
+                    mFontInfo.font[toCompute] =
+                        mFontInfo.font[basedOn].deriveFont(AWT_STYLES[toCompute]);
+                    return;
+                }
+            }
+
+            // we really shouldn't stop there. This means we don't have a NORMAL font...
+            assert false;
         }
 
         private String trimXmlWhitespaces(String value) {