Layoutlib fixes for L [DO NOT MERGE]

This adds the new delegates that were missing. This starts the work on
changes related to Minikin Fonts.

There are some changes related to TypedArray that still need to be
fixed.

Change-Id: Ic2397b64aa3f1f48926e849b14689c47d9ee7f8c
(cherry picked from commit 7ca3612094270183243938e79337c84effea7ad0)

1 files changed, 225 insertions, 0 deletions

diff --git a/tools/layoutlib/bridge/src/android/graphics/FontFamily_Delegate.java b/tools/layoutlib/bridge/src/android/graphics/FontFamily_Delegate.java
new file mode 100644
index 0000000..5e7543a
--- /dev/null
+++ b/tools/layoutlib/bridge/src/android/graphics/FontFamily_Delegate.java
@@ -0,0 +1,225 @@
+/*
+ * 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;
+    }
+}