SkPDF: Implement /ActualText to make text extraction correct.

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
 #define SkPDFUtils_DEFINED
 
 #include "SkPaint.h"
 #include "SkPath.h"
 #include "SkStream.h"
+#include "SkUtils.h"
 
 class SkMatrix;
 class SkPDFArray;
 struct SkRect;
 
 #if 0
 #define PRINT_NOT_IMPL(str) fprintf(stderr, str)
 #else
 #define PRINT_NOT_IMPL(str)
 #endif
@@ skipping 60 matching lines @@
     result[3] = gHex[0xF & (value      )];
     wStream->write(result, 4);
 }
 inline void WriteUInt8(SkDynamicMemoryWStream* wStream, uint8_t value) {
     static const char gHex[] = "0123456789ABCDEF";
     char result[2];
     result[0] = gHex[value >> 4 ];
     result[1] = gHex[0xF & value];
     wStream->write(result, 2);
 }
-
+inline void WriteUTF16beHex(SkDynamicMemoryWStream* wStream, SkUnichar utf32) {
+    uint16_t utf16[2] = {0, 0};
+    size_t len = SkUTF16_FromUnichar(utf32, utf16);
+    SkASSERT(len == 1 || len == 2);
+    SkPDFUtils::WriteUInt16BE(wStream, utf16[0]);
+    if (len == 2) {
+        SkPDFUtils::WriteUInt16BE(wStream, utf16[1]);
+    }
+}
 }  // namespace SkPDFUtils
 
 #endif