Bold StyleSpan further for auto-bold

StyleSpan with Typeface.BOLD will only bold if the text doesn't already
have a BOLD style. But auto-bolded text needs to be further bolded.
If the Typeface style is BOLD, bold more for auto-bold.
(The fake bold works for Typefaces with weight < 700)

Test: manual - settings page, example StyleSpans,
atest StyleSpanTest TextViewTests
Bug: 175177807

Change-Id: Iec7db7eadd18ed6a2efc6ee39b49c1d6cb15d870

core/api/current.txt

@@ -45668,8 +45668,10 @@ package android.text.style {
 
   public class StyleSpan extends android.text.style.MetricAffectingSpan implements android.text.ParcelableSpan {
     ctor public StyleSpan(int);
+    ctor public StyleSpan(int, int);
     ctor public StyleSpan(@NonNull android.os.Parcel);
     method public int describeContents();
+    method public int getFontWeightAdjustment();
     method public int getSpanTypeId();
     method public int getStyle();
     method public void updateDrawState(android.text.TextPaint);

core/java/android/content/res/StringBlock.java

@@ -16,8 +16,9 @@
 
 package android.content.res;
 
-import android.annotation.NonNull;
 import android.annotation.Nullable;
+import android.app.ActivityThread;
+import android.app.Application;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.graphics.Color;
 import android.graphics.Paint;
@@ -238,7 +239,10 @@ public final class StringBlock implements Closeable {
 
 
             if (type == ids.boldId) {
-                buffer.setSpan(new StyleSpan(Typeface.BOLD),
+                Application application = ActivityThread.currentApplication();
+                int fontWeightAdjustment =
+                        application.getResources().getConfiguration().fontWeightAdjustment;
+                buffer.setSpan(new StyleSpan(Typeface.BOLD, fontWeightAdjustment),
                                style[i+1], style[i+2]+1,
                                Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             } else if (type == ids.italicId) {

core/java/android/text/Html.java

@@ -858,9 +858,17 @@ class HtmlToSpannedConverter implements ContentHandler {
         } else if (tag.equalsIgnoreCase("span")) {
             endCssStyle(mSpannableStringBuilder);
         } else if (tag.equalsIgnoreCase("strong")) {
-            end(mSpannableStringBuilder, Bold.class, new StyleSpan(Typeface.BOLD));
+            Application application = ActivityThread.currentApplication();
+            int fontWeightAdjustment =
+                    application.getResources().getConfiguration().fontWeightAdjustment;
+            end(mSpannableStringBuilder, Bold.class, new StyleSpan(Typeface.BOLD,
+                    fontWeightAdjustment));
         } else if (tag.equalsIgnoreCase("b")) {
-            end(mSpannableStringBuilder, Bold.class, new StyleSpan(Typeface.BOLD));
+            Application application = ActivityThread.currentApplication();
+            int fontWeightAdjustment =
+                    application.getResources().getConfiguration().fontWeightAdjustment;
+            end(mSpannableStringBuilder, Bold.class, new StyleSpan(Typeface.BOLD,
+                    fontWeightAdjustment));
         } else if (tag.equalsIgnoreCase("em")) {
             end(mSpannableStringBuilder, Italic.class, new StyleSpan(Typeface.ITALIC));
         } else if (tag.equalsIgnoreCase("cite")) {
@@ -1028,8 +1036,11 @@ class HtmlToSpannedConverter implements ContentHandler {
         // Their ranges should not include the newlines at the end
         Heading h = getLast(text, Heading.class);
         if (h != null) {
+            Application application = ActivityThread.currentApplication();
+            int fontWeightAdjustment =
+                    application.getResources().getConfiguration().fontWeightAdjustment;
             setSpanFromMark(text, h, new RelativeSizeSpan(HEADING_SIZES[h.mLevel]),
-                    new StyleSpan(Typeface.BOLD));
+                    new StyleSpan(Typeface.BOLD, fontWeightAdjustment));
         }
 
         endBlockElement(text);

core/java/android/text/style/StyleSpan.java

@@ -17,8 +17,10 @@
 package android.text.style;
 
 import android.annotation.NonNull;
+import android.content.res.Configuration;
 import android.graphics.Paint;
 import android.graphics.Typeface;
+import android.graphics.fonts.FontStyle;
 import android.os.Parcel;
 import android.text.ParcelableSpan;
 import android.text.TextPaint;
@@ -45,6 +47,7 @@ import android.text.TextUtils;
 public class StyleSpan extends MetricAffectingSpan implements ParcelableSpan {
 
     private final int mStyle;
+    private final int mFontWeightAdjustment;
 
     /**
      * Creates a {@link StyleSpan} from a style.
@@ -54,7 +57,23 @@ public class StyleSpan extends MetricAffectingSpan implements ParcelableSpan {
      *              in {@link Typeface}.
      */
     public StyleSpan(int style) {
+        this(style, Configuration.FONT_WEIGHT_ADJUSTMENT_UNDEFINED);
+    }
+
+    /**
+     * Creates a {@link StyleSpan} from a style and font weight adjustment.
+     *
+     * @param style An integer constant describing the style for this span. Examples
+     *              include bold, italic, and normal. Values are constants defined
+     *              in {@link Typeface}.
+     * @param fontWeightAdjustment An integer describing the adjustment to be made to the font
+     *              weight.
+     * @see Configuration#fontWeightAdjustment This is the adjustment in text font weight
+     * that is used to reflect the current user's preference for increasing font weight.
+     */
+    public StyleSpan(@Typeface.Style int style, int fontWeightAdjustment) {
         mStyle = style;
+        mFontWeightAdjustment = fontWeightAdjustment;
     }
 
     /**
@@ -64,6 +83,7 @@ public class StyleSpan extends MetricAffectingSpan implements ParcelableSpan {
      */
     public StyleSpan(@NonNull Parcel src) {
         mStyle = src.readInt();
+        mFontWeightAdjustment = src.readInt();
     }
 
     @Override
@@ -91,6 +111,7 @@ public class StyleSpan extends MetricAffectingSpan implements ParcelableSpan {
     @Override
     public void writeToParcelInternal(@NonNull Parcel dest, int flags) {
         dest.writeInt(mStyle);
+        dest.writeInt(mFontWeightAdjustment);
     }
 
     /**
@@ -100,17 +121,24 @@ public class StyleSpan extends MetricAffectingSpan implements ParcelableSpan {
         return mStyle;
     }
 
+    /**
+     * Returns the font weight adjustment specified by this span.
+     */
+    public int getFontWeightAdjustment() {
+        return mFontWeightAdjustment;
+    }
+
     @Override
     public void updateDrawState(TextPaint ds) {
-        apply(ds, mStyle);
+        apply(ds, mStyle, mFontWeightAdjustment);
     }
 
     @Override
     public void updateMeasureState(TextPaint paint) {
-        apply(paint, mStyle);
+        apply(paint, mStyle, mFontWeightAdjustment);
     }
 
-    private static void apply(Paint paint, int style) {
+    private static void apply(Paint paint, int style, int fontWeightAdjustment) {
         int oldStyle;
 
         Typeface old = paint.getTypeface();
@@ -129,6 +157,18 @@ public class StyleSpan extends MetricAffectingSpan implements ParcelableSpan {
             tf = Typeface.create(old, want);
         }
 
+        // Base typeface may already be bolded by auto bold. Bold further.
+        if ((style & Typeface.BOLD) != 0) {
+            if (fontWeightAdjustment != 0
+                    && fontWeightAdjustment != Configuration.FONT_WEIGHT_ADJUSTMENT_UNDEFINED) {
+                int newWeight = Math.min(
+                        Math.max(tf.getWeight() + fontWeightAdjustment, FontStyle.FONT_WEIGHT_MIN),
+                        FontStyle.FONT_WEIGHT_MAX);
+                boolean italic = (want & Typeface.ITALIC) != 0;
+                tf = Typeface.create(tf, newWeight, italic);
+            }
+        }
+
         int fake = want & ~tf.getStyle();
 
         if ((fake & Typeface.BOLD) != 0) {