Remove system call in DW for default font.

src/ports/SkFontMgr_win_dw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDWrite.h"
 #include "SkDWriteFontFileStream.h"
 #include "SkFontMgr.h"
@@ skipping 611 matching lines @@
 
     SkTypeface* FallbackTypeface() { return fResolvedTypeface; }
 
 protected:
     ULONG fRefCount;
     SkAutoTUnref<const SkFontMgr_DirectWrite> fOuter;
     UINT32 fCharacter;
     SkTypeface* fResolvedTypeface;
 };
 
-static HRESULT getDefaultFontFamilyName(SkSMallocWCHAR* name) {
-    NONCLIENTMETRICSW metrics;
-    metrics.cbSize = sizeof(metrics);
-    if (0 == SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, sizeof(metrics), &metrics, 0)) {
-        return E_UNEXPECTED;
-    }
-
-    size_t len = wcsnlen_s(metrics.lfMessageFont.lfFaceName, LF_FACESIZE) + 1;
-    if (0 != wcsncpy_s(name->reset(len), len, metrics.lfMessageFont.lfFaceName, _TRUNCATE)) {
-        return E_UNEXPECTED;
-    }
-
-    return S_OK;
-}
-
 class FontFallbackSource : public IDWriteTextAnalysisSource {
 public:
     FontFallbackSource(const WCHAR* string, UINT32 length, const WCHAR* locale,
                        IDWriteNumberSubstitution* numberSubstitution)
         : fString(string)
         , fLength(length)
         , fLocale(locale)
         , fNumberSubstitution(numberSubstitution)
     { }
 
@@ skipping 86 matching lines @@
     IDWriteNumberSubstitution* fNumberSubstitution;
 };
 
 SkTypeface* SkFontMgr_DirectWrite::onMatchFamilyStyleCharacter(const char familyName[],
                                                                const SkFontStyle& style,
                                                                const char* bcp47[], int bcp47Count,
                                                                SkUnichar character) const
 {
     const DWriteStyle dwStyle(style);
 
-    SkSMallocWCHAR dwFamilyName;
-    if (NULL == familyName) {
-        HRN(getDefaultFontFamilyName(&dwFamilyName));
-    } else {
-        HRN(sk_cstring_to_wchar(familyName, &dwFamilyName));
+    const WCHAR* dwFamilyName = NULL;
+    SkSMallocWCHAR dwFamilyNameLocal;
+    if (familyName) {
+        HRN(sk_cstring_to_wchar(familyName, &dwFamilyNameLocal));
+        dwFamilyName = dwFamilyNameLocal;
     }
 
     WCHAR str[16];
     UINT32 strLen = static_cast<UINT32>(
         SkUTF16_FromUnichar(character, reinterpret_cast<uint16_t*>(str)));
 
     const SkSMallocWCHAR* dwBcp47;
     SkSMallocWCHAR dwBcp47Local;
     if (bcp47Count < 1) {
         dwBcp47 = &fLocaleName;
@@ skipping 41 matching lines @@
 
         SkTScopedComPtr<IDWriteFontFamily> fontFamily;
         HRNM(font->GetFontFamily(&fontFamily), "Could not get family from font.");
         return this->createTypefaceFromDWriteFont(fontFace.get(), font.get(), fontFamily.get());
     }
 #else
 #  pragma message("No dwrite_2.h is available, font fallback may be affected.")
 #endif
 
     SkTScopedComPtr<IDWriteTextFormat> fallbackFormat;
-    HRNM(fFactory->CreateTextFormat(dwFamilyName,
+    HRNM(fFactory->CreateTextFormat(dwFamilyName ? dwFamilyName : L"",
                                     fFontCollection.get(),
                                     dwStyle.fWeight,
                                     dwStyle.fSlant,
                                     dwStyle.fWidth,
                                     72.0f,
                                     *dwBcp47,
                                     &fallbackFormat),
          "Could not create text format.");
 
     SkTScopedComPtr<IDWriteTextLayout> fallbackLayout;
@@ skipping 282 matching lines @@
 }
 
 #include "SkFontMgr_indirect.h"
 SK_API SkFontMgr* SkFontMgr_New_DirectWriteRenderer(SkRemotableFontMgr* proxy) {
     SkAutoTUnref<SkFontMgr> impl(SkFontMgr_New_DirectWrite());
     if (impl.get() == NULL) {
         return NULL;
     }
     return SkNEW_ARGS(SkFontMgr_Indirect, (impl.get(), proxy));
 }