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 5a4b75579bf4ef7b5b3d0264d39a9d1901c02be5..f982b5faa1de946daf5ba60c8f6f394a36b4d2a8 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 SkFontData& data) {
+    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>(data.getAxisCount()) != 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] = data.getAxis()[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) {
@@ -289,34 +321,36 @@ static SkFaceRec* ref_ft_face(const SkTypeface* typeface) {
         rec = rec->fNext;
     }
 
-    int face_index;
-    SkStreamAsset* stream = typeface->openStream(&face_index);
-    if (NULL == stream) {
+    SkFontData* data = typeface->createFontData();
+    if (NULL == data || !data->hasStream()) {
         return NULL;
     }
 
     // this passes ownership of stream to the rec
-    rec = SkNEW_ARGS(SkFaceRec, (stream, fontID));
+    rec = SkNEW_ARGS(SkFaceRec, (data->transferStream(), fontID));
 
     FT_Open_Args args;
     memset(&args, 0, sizeof(args));
-    const void* memoryBase = stream->getMemoryBase();
+    const void* memoryBase = rec->fSkStream->getMemoryBase();
     if (memoryBase) {
         args.flags = FT_OPEN_MEMORY;
         args.memory_base = (const FT_Byte*)memoryBase;
-        args.memory_size = stream->getLength();
+        args.memory_size = rec->fSkStream->getLength();
     } else {
         args.flags = FT_OPEN_STREAM;
         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, data->getIndex(), &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, *data);
+
     rec->fNext = gFaceRecHead;
     gFaceRecHead = rec;
     return rec;