SkPDF: pull out SkPDFMakeCIDGlyphWidthsArray.cpp

src/pdf/SkPDFMakeCIDGlyphWidthsArray.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkPDFMakeCIDGlyphWidthsArray_DEFINED
+#define SkPDFMakeCIDGlyphWidthsArray_DEFINED
+
+#include "SkPDFTypes.h"
+
+class SkBitSet;
+class SkGlyphCache;
+
+/* PDF 32000-1:2008, page 270: "The array’s elements have a variable
+   format that can specify individual widths for consecutive CIDs or
+   one width for a range of CIDs". */
+sk_sp<SkPDFArray> SkPDFMakeCIDGlyphWidthsArray(SkGlyphCache* cache,
+                                               const SkBitSet* subset,
+                                               uint16_t emSize,
+                                               int16_t* defaultWidth);
+
+#endif  // SkPDFMakeCIDGlyphWidthsArray_DEFINED