Adding code to calculate Underline Thickness from Font Metrics, this will be useful when Skia is us…

src/core/SkPaint.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPaint.h"
 #include "SkAnnotation.h"
@@ skipping 1287 matching lines @@
     if (scale) {
         metrics->fTop = SkScalarMul(metrics->fTop, scale);
         metrics->fAscent = SkScalarMul(metrics->fAscent, scale);
         metrics->fDescent = SkScalarMul(metrics->fDescent, scale);
         metrics->fBottom = SkScalarMul(metrics->fBottom, scale);
         metrics->fLeading = SkScalarMul(metrics->fLeading, scale);
         metrics->fAvgCharWidth = SkScalarMul(metrics->fAvgCharWidth, scale);
         metrics->fXMin = SkScalarMul(metrics->fXMin, scale);
         metrics->fXMax = SkScalarMul(metrics->fXMax, scale);
         metrics->fXHeight = SkScalarMul(metrics->fXHeight, scale);
+        metrics->fUnderlineThickness = SkScalarMul(metrics->fUnderlineThickness, scale);
+        metrics->fUnderlinePosition = SkScalarMul(metrics->fUnderlinePosition, scale);
     }
     return metrics->fDescent - metrics->fAscent + metrics->fLeading;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static void set_bounds(const SkGlyph& g, SkRect* bounds, SkScalar scale) {
     bounds->set(g.fLeft * scale,
                 g.fTop * scale,
                 (g.fLeft + g.fWidth) * scale,
@@ skipping 1334 matching lines @@
     }
 #ifdef SK_BUILD_FOR_ANDROID
     if (dirty & kPaintOptionsAndroid_DirtyBit) {
         SkPaintOptionsAndroid options;
         options.unflatten(buffer);
         paint->setPaintOptionsAndroid(options);
     }
 #endif
     SkASSERT(dirty == paint->fDirtyBits);
 }