Support for fake bold and italics

This patch adds support for computing when fake bold and fake italics
are needed (because the styles are requested but not provided by the
matching FontFamily), and providing them as part of the layout result.

Part of the fix for bug 15436379 Fake bold doesn't fully work (Minikin)

Change-Id: I180c034b559837943673b5c272c8e890178dff0d

1 files changed, 20 insertions, 1 deletions

diff --git a/include/minikin/FontFamily.h b/include/minikin/FontFamily.h
index 6bdf5d6..060d167 100644
--- a/include/minikin/FontFamily.h
+++ b/include/minikin/FontFamily.h
@@ -94,6 +94,25 @@ inline hash_t hash_type(const FontStyle &style) {
     return style.hash();
 }
 
+// attributes representing transforms (fake bold, fake italic) to match styles
+class FontFakery {
+public:
+    FontFakery() : mFakeBold(false), mFakeItalic(false) { }
+    FontFakery(bool fakeBold, bool fakeItalic) : mFakeBold(fakeBold), mFakeItalic(fakeItalic) { }
+    // TODO: want to support graded fake bolding
+    bool isFakeBold() { return mFakeBold; }
+    bool isFakeItalic() { return mFakeItalic; }
+private:
+    bool mFakeBold;
+    bool mFakeItalic;
+};
+
+struct FakedFont {
+    // ownership is the enclosing FontCollection
+    MinikinFont* font;
+    FontFakery fakery;
+};
+
 class FontFamily : public MinikinRefCounted {
 public:
     FontFamily() { }
@@ -107,7 +126,7 @@ public:
     bool addFont(MinikinFont* typeface);
 
     void addFont(MinikinFont* typeface, FontStyle style);
-    MinikinFont* getClosestMatch(FontStyle style) const;
+    FakedFont getClosestMatch(FontStyle style) const;
 
     FontLanguage lang() const { return mLang; }
     int variant() const { return mVariant; }