Font variations.

src/ports/SkFontHost_FreeType.cpp

Index: src/ports/SkFontHost_FreeType.cpp
diff --git a/src/ports/SkFontHost_FreeType.cpp b/src/ports/SkFontHost_FreeType.cpp
index 19aed66a5c54fe484737baa1090cb5c9bd40a260..1a9c182ca8004571b4f733b917879c6532fce1fb 100644
--- a/src/ports/SkFontHost_FreeType.cpp
+++ b/src/ports/SkFontHost_FreeType.cpp
@@ -11,6 +11,7 @@
 #include "SkColorPriv.h"
 #include "SkDescriptor.h"
 #include "SkFDot6.h"
+#include "SkFontDescriptor.h"
 #include "SkFontHost_FreeType_common.h"
 #include "SkGlyph.h"
 #include "SkMask.h"
@@ -33,6 +34,7 @@
 #include FT_FREETYPE_H
 #include FT_LCD_FILTER_H
 #include FT_MODULE_H
+#include FT_MULTIPLE_MASTERS_H
 #include FT_OUTLINE_H
 #include FT_SIZES_H
 #include FT_SYSTEM_H
@@ -273,6 +275,36 @@ SkFaceRec::SkFaceRec(SkStreamAsset* stream, uint32_t fontID)
     fFTStream.close = sk_ft_stream_close;
 }
 
+static void ft_face_setup_axes(FT_Face face, const decltype(SkFontParameters::fAxis)& axes) {
+    if (!(face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS)) {
+        return;
+    }
+    SkDEBUGF(("INFO: font is mm!\n"));
+
+    FT_MM_Var* variations = NULL;
+    FT_Error err = FT_Get_MM_Var(face, &variations);
+    if (err) {
+        SkDEBUGF(("INFO: font is mm, but has no variations!\n"));
+        return;
+    }
+    SkAutoFree autoFreeVariations(variations);
+
+    if (static_cast<FT_UInt>(axes.count()) != variations->num_axis) {
+        SkDEBUGF(("INFO: font is mm, but has different number of variations!\n"));
+        return;
+    }
+
+    SkAutoSTMalloc<16, FT_Fixed> coords(variations->num_axis);
+    for (FT_UInt i = 0; i < variations->num_axis; ++i) {
+        coords[i] = axes[i];
+    }
+    err = FT_Set_Var_Design_Coordinates(face, variations->num_axis, coords.get());
+    if (err) {
+        SkDEBUGF(("INFO: font is mm, but has no variations!\n"));
+        return;
+    }
+}
+
 // Will return 0 on failure
 // Caller must lock gFTMutex before calling this function.
 static SkFaceRec* ref_ft_face(const SkTypeface* typeface) {
@@ -289,8 +321,8 @@ static SkFaceRec* ref_ft_face(const SkTypeface* typeface) {
         rec = rec->fNext;
     }
 
-    int face_index;
-    SkStreamAsset* stream = typeface->openStream(&face_index);
+    SkFontParameters params;
+    SkStreamAsset* stream = typeface->openStream2(&params);
     if (NULL == stream) {
         return NULL;
     }
@@ -310,13 +342,16 @@ static SkFaceRec* ref_ft_face(const SkTypeface* typeface) {
         args.stream = &rec->fFTStream;
     }
 
-    FT_Error err = FT_Open_Face(gFTLibrary->library(), &args, face_index, &rec->fFace);
+    FT_Error err = FT_Open_Face(gFTLibrary->library(), &args, params.fIndex, &rec->fFace);
     if (err) {    // bad filename, try the default font
         SkDEBUGF(("ERROR: unable to open font '%x'\n", fontID));
         SkDELETE(rec);
         return NULL;
     }
     SkASSERT(rec->fFace);
+
+    ft_face_setup_axes(rec->fFace, params.fAxis);
+
     rec->fNext = gFaceRecHead;
     gFaceRecHead = rec;
     return rec;