Font variations.

src/ports/SkFontHost_FreeType.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAdvancedTypefaceMetrics.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
 #include "SkDescriptor.h"
 #include "SkFDot6.h"
+#include "SkFontDescriptor.h"
 #include "SkFontHost_FreeType_common.h"
 #include "SkGlyph.h"
 #include "SkMask.h"
 #include "SkMaskGamma.h"
 #include "SkMatrix22.h"
 #include "SkOTUtils.h"
 #include "SkScalerContext.h"
 #include "SkStream.h"
 #include "SkString.h"
 #include "SkTemplates.h"
 #include "SkThread.h"
 #include "SkTypes.h"
 
 #if defined(SK_CAN_USE_DLOPEN)
 #include <dlfcn.h>
 #endif
 #include <ft2build.h>
 #include FT_ADVANCES_H
 #include FT_BITMAP_H
 #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
 #include FT_TRUETYPE_TABLES_H
 #include FT_TYPE1_TABLES_H
 #include FT_XFREE86_H
 
 // FT_LOAD_COLOR and the corresponding FT_Pixel_Mode::FT_PIXEL_MODE_BGRA
 // were introduced in FreeType 2.5.0.
 // The following may be removed once FreeType 2.5.0 is required to build.
@@ skipping 220 matching lines @@
 SkFaceRec::SkFaceRec(SkStreamAsset* stream, uint32_t fontID)
         : fNext(NULL), fSkStream(stream), fRefCnt(1), fFontID(fontID)
 {
     sk_bzero(&fFTStream, sizeof(fFTStream));
     fFTStream.size = fSkStream->getLength();
     fFTStream.descriptor.pointer = fSkStream;
     fFTStream.read  = sk_ft_stream_io;
     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) {
     gFTMutex.assertHeld();
 
     const SkFontID fontID = typeface->uniqueID();
     SkFaceRec* rec = gFaceRecHead;
     while (rec) {
         if (rec->fFontID == fontID) {
             SkASSERT(rec->fFace);
             rec->fRefCnt += 1;
             return rec;
         }
         rec = rec->fNext;
     }
 
-    int face_index;
-    SkStreamAsset* stream = typeface->openStream(&face_index);
+    SkFontParameters params;
+    SkStreamAsset* stream = typeface->openStream2(&params);
     if (NULL == stream) {
         return NULL;
     }
 
     // this passes ownership of stream to the rec
     rec = SkNEW_ARGS(SkFaceRec, (stream, fontID));
 
     FT_Open_Args args;
     memset(&args, 0, sizeof(args));
     const void* memoryBase = stream->getMemoryBase();
     if (memoryBase) {
         args.flags = FT_OPEN_MEMORY;
         args.memory_base = (const FT_Byte*)memoryBase;
         args.memory_size = stream->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, 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;
 }
 
 // Caller must lock gFTMutex before calling this function.
 static void unref_ft_face(FT_Face face) {
     gFTMutex.assertHeld();
 
     SkFaceRec*  rec = gFaceRecHead;
@@ skipping 1391 matching lines @@
     if (style) {
         *style = SkFontStyle(weight, width, slant);
     }
     if (isFixedPitch) {
         *isFixedPitch = FT_IS_FIXED_WIDTH(face);
     }
 
     FT_Done_Face(face);
     return true;
 }