Initialize bounds even if the text length is zero.

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 1053 matching lines @@
         width = this->measure_text(cache, text, length, &tempCount, bounds);
         if (scale) {
             width = SkScalarMul(width, scale);
             if (bounds) {
                 bounds->fLeft = SkScalarMul(bounds->fLeft, scale);
                 bounds->fTop = SkScalarMul(bounds->fTop, scale);
                 bounds->fRight = SkScalarMul(bounds->fRight, scale);
                 bounds->fBottom = SkScalarMul(bounds->fBottom, scale);
             }
         }
+    } else if (bounds) {
+        // ensure that even if we don't measure_text we still update the bounds
+        bounds->setEmpty();
     }
     return width;
 }
 
 typedef bool (*SkTextBufferPred)(const char* text, const char* stop);
 
 static bool forward_textBufferPred(const char* text, const char* stop) {
     return text < stop;
 }
 
@@ skipping 1461 matching lines @@
             if (firstTime) {
                 *dst = r;
             } else {
                 dst->join(r);
             }
         } else {
             break;
         }
     }
 }