SkPDF: fix scalar serialization

src/pdf/SkPDFUtils.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFUtils_DEFINED
@@ skipping 40 matching lines @@
                          SkWStream* content) {
         SkPDFUtils::EmitPath(path, paintStyle, true, content);
     }
     static void ClosePath(SkWStream* content);
     static void PaintPath(SkPaint::Style style, SkPath::FillType fill,
                           SkWStream* content);
     static void StrokePath(SkWStream* content);
     static void DrawFormXObject(int objectIndex, SkWStream* content);
     static void ApplyGraphicState(int objectIndex, SkWStream* content);
     static void ApplyPattern(int objectIndex, SkWStream* content);
+
+    // 3 = '-', '.', and '\0' characters.
+    // 9 = number of significant digits
+    // abs(FLT_MIN_10_EXP) = number of zeros in FLT_MIN
+    static const size_t kMaximumFloatDecimalLength = 3 + 9 - FLT_MIN_10_EXP;
+    // FloatToDecimal is exposed for unit tests.
+    static size_t FloatToDecimal(float value,
+                                 char output[kMaximumFloatDecimalLength]);
     static void AppendScalar(SkScalar value, SkWStream* stream);
     static SkString FormatString(const char* input, size_t len);
 };
 
 #endif