Move SkFontMgr and SkFontStyle impls to own cpp.

src/core/SkFontStyle.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkFontStyle.h"
+#include "SkTypeface.h"
+#include "SkTypes.h"
+
+SkFontStyle::SkFontStyle() {
+    fUnion.fU32 = 0;
+    fUnion.fR.fWeight = kNormal_Weight;
+    fUnion.fR.fWidth = kNormal_Width;
+    fUnion.fR.fSlant = kUpright_Slant;
+}
+
+SkFontStyle::SkFontStyle(int weight, int width, Slant slant) {
+    fUnion.fU32 = 0;
+    fUnion.fR.fWeight = SkPin32(weight, kThin_Weight, kBlack_Weight);
+    fUnion.fR.fWidth = SkPin32(width, kUltraCondensed_Width, kUltaExpanded_Width);
+    fUnion.fR.fSlant = SkPin32(slant, kUpright_Slant, kItalic_Slant);
+}
+
+SkFontStyle::SkFontStyle(unsigned oldStyle) {
+    fUnion.fU32 = 0;
+    fUnion.fR.fWeight = (oldStyle & SkTypeface::kBold) ? SkFontStyle::kBold_Weight
+                                                       : SkFontStyle::kNormal_Weight;
+    fUnion.fR.fWidth = SkFontStyle::kNormal_Width;
+    fUnion.fR.fSlant = (oldStyle & SkTypeface::kItalic) ? SkFontStyle::kItalic_Slant
+                                                        : SkFontStyle::kUpright_Slant;
+}