Make FreeType usable on Windows.

src/ports/SkFontHost_FreeType.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 "SkAdvancedTypefaceMetrics.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 343 matching lines @@
     if (!rec->fFace->charmap) {
         FT_Select_Charmap(rec->fFace, FT_ENCODING_MS_SYMBOL);
     }
 
     rec->fNext = gFaceRecHead;
     gFaceRecHead = rec;
     return rec->fFace;
 }
 
 // Caller must lock gFTMutex before calling this function.
-static void unref_ft_face(FT_Face face) {
+extern void unref_ft_face(FT_Face face);
+void unref_ft_face(FT_Face face) {
     gFTMutex.assertHeld();
 
     SkFaceRec*  rec = gFaceRecHead;
     SkFaceRec*  prev = nullptr;
     while (rec) {
         SkFaceRec* next = rec->fNext;
         if (rec->fFace == face) {
             if (--rec->fRefCnt == 0) {
                 if (prev) {
                     prev->fNext = next;
@@ skipping 902 matching lines @@
 }
 
 void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* metrics) {
     if (nullptr == metrics) {
         return;
     }
 
     SkAutoMutexAcquire ac(gFTMutex);
 
     if (this->setupSize()) {
-        ERROR:
         sk_bzero(metrics, sizeof(*metrics));
         return;
     }
 
     FT_Face face = fFace;
     SkScalar scaleX = fScale.x();
     SkScalar scaleY = fScale.y();
     SkScalar mxy = fMatrix22Scalar.getSkewX() * scaleY;
     SkScalar myy = fMatrix22Scalar.getScaleY() * scaleY;
 
@@ skipping 71 matching lines @@
         xmin = 0.0f;
         xmax = SkIntToScalar(face->available_sizes[fStrikeIndex].width) / xppem;
         ymin = descent + leading;
         ymax = ascent - descent;
         underlineThickness = 0;
         underlinePosition = 0;
 
         metrics->fFlags &= ~SkPaint::FontMetrics::kUnderlineThinknessIsValid_Flag;
         metrics->fFlags &= ~SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag;
     } else {
-        goto ERROR;
+        sk_bzero(metrics, sizeof(*metrics));
+        return;
     }
 
     // synthesize elements that were not provided by the os/2 table or format-specific metrics
     if (!x_height) {
         x_height = -ascent;
     }
     if (!avgCharWidth) {
         avgCharWidth = xmax - xmin;
     }
     if (!cap_height) {
@@ skipping 416 matching lines @@
                 SkDEBUGF(("Requested font axis not found: %s '%c%c%c%c'\n",
                           name.c_str(),
                           (skTag >> 24) & 0xFF,
                           (skTag >> 16) & 0xFF,
                           (skTag >>  8) & 0xFF,
                           (skTag)       & 0xFF));
             }
         }
     )
 }