Revert of Extend SkFontMgr_Custom to cover ttc, otf, pfb. (patchset #2 id:20001 of https://codereview.chromium.org/672723002/)

Reason for revert:
Reverting as this appears to be causing issues with color fonts on Android.

Original issue's description:
> Extend SkFontMgr_Custom to cover ttc, otf, pfb.
>
> Adds ability to test ScanFont with Type1 (pfb) fonts
> and fonts with multiple faces (ttc).
>
> Committed: https://skia.googlesource.com/skia/+/ee0c2e4fd429424beaa35f29e7f656997ba3f115

TBR=reed@google.com,halcanary@google.com
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/685803003
diff --git a/src/fonts/SkFontMgr_fontconfig.cpp b/src/fonts/SkFontMgr_fontconfig.cpp
index 4f99a6f..c56e065 100644
--- a/src/fonts/SkFontMgr_fontconfig.cpp
+++ b/src/fonts/SkFontMgr_fontconfig.cpp
@@ -214,7 +214,7 @@
 class SkFontMgr_fontconfig : public SkFontMgr {
     SkAutoTUnref<SkFontConfigInterface> fFCI;
     SkDataTable* fFamilyNames;
-    SkTypeface_FreeType::Scanner fScanner;
+
 
 public:
     SkFontMgr_fontconfig(SkFontConfigInterface* fci)
@@ -302,7 +302,7 @@
         // TODO should the caller give us the style or should we get it from freetype?
         SkFontStyle style;
         bool isFixedWidth = false;
-        if (!fScanner.scanFont(stream, 0, NULL, &style, &isFixedWidth)) {
+        if (!SkTypeface_FreeType::ScanFont(stream, 0, NULL, &style, &isFixedWidth)) {
             return NULL;
         }
 
diff --git a/src/ports/SkFontHost_FreeType.cpp b/src/ports/SkFontHost_FreeType.cpp
index 58d2999..ba0ce14 100644
--- a/src/ports/SkFontHost_FreeType.cpp
+++ b/src/ports/SkFontHost_FreeType.cpp
@@ -1669,26 +1669,20 @@
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 
-
-SkTypeface_FreeType::Scanner::Scanner() {
-    if (FT_Init_FreeType(&fLibrary)) {
-        fLibrary = NULL;
-    }
-}
-SkTypeface_FreeType::Scanner::~Scanner() {
-    FT_Done_FreeType(fLibrary);
-}
-
-FT_Face SkTypeface_FreeType::Scanner::openFace(SkStream* stream, int ttcIndex) const {
-    if (fLibrary == NULL) {
-        return NULL;
+#include "SkTSearch.h"
+/*static*/ bool SkTypeface_FreeType::ScanFont(
+    SkStream* stream, int ttcIndex, SkString* name, SkFontStyle* style, bool* isFixedPitch)
+{
+    FT_Library  library;
+    if (FT_Init_FreeType(&library)) {
+        return false;
     }
 
-    FT_Open_Args args;
+    FT_Open_Args    args;
     memset(&args, 0, sizeof(args));
 
     const void* memoryBase = stream->getMemoryBase();
-    FT_StreamRec streamRec;
+    FT_StreamRec    streamRec;
 
     if (memoryBase) {
         args.flags = FT_OPEN_MEMORY;
@@ -1706,30 +1700,8 @@
     }
 
     FT_Face face;
-    if (FT_Open_Face(fLibrary, &args, ttcIndex, &face)) {
-        return NULL;
-    }
-    return face;
-}
-
-bool SkTypeface_FreeType::Scanner::recognizedFont(SkStream* stream, int* numFaces) const {
-    FT_Face face = this->openFace(stream, -1);
-    if (NULL == face) {
-        return false;
-    }
-
-    *numFaces = face->num_faces;
-
-    FT_Done_Face(face);
-    return true;
-}
-
-#include "SkTSearch.h"
-bool SkTypeface_FreeType::Scanner::scanFont(
-    SkStream* stream, int ttcIndex, SkString* name, SkFontStyle* style, bool* isFixedPitch) const
-{
-    FT_Face face = this->openFace(stream, ttcIndex);
-    if (NULL == face) {
+    if (FT_Open_Face(library, &args, ttcIndex, &face)) {
+        FT_Done_FreeType(library);
         return false;
     }
 
@@ -1759,19 +1731,14 @@
             { "book", (SkFontStyle::kNormal_Weight + SkFontStyle::kLight_Weight)/2 },
             { "demi", SkFontStyle::kSemiBold_Weight },
             { "demibold", SkFontStyle::kSemiBold_Weight },
-            { "extra", SkFontStyle::kExtraBold_Weight },
             { "extrabold", SkFontStyle::kExtraBold_Weight },
             { "extralight", SkFontStyle::kExtraLight_Weight },
-            { "hairline", SkFontStyle::kThin_Weight },
             { "heavy", SkFontStyle::kBlack_Weight },
             { "light", SkFontStyle::kLight_Weight },
             { "medium", SkFontStyle::kMedium_Weight },
             { "normal", SkFontStyle::kNormal_Weight },
-            { "plain", SkFontStyle::kNormal_Weight },
             { "regular", SkFontStyle::kNormal_Weight },
-            { "roman", SkFontStyle::kNormal_Weight },
             { "semibold", SkFontStyle::kSemiBold_Weight },
-            { "standard", SkFontStyle::kNormal_Weight },
             { "thin", SkFontStyle::kThin_Weight },
             { "ultra", SkFontStyle::kExtraBold_Weight },
             { "ultrablack", 1000 },
@@ -1784,7 +1751,7 @@
         if (index >= 0) {
             weight = commonWeights[index].weight;
         } else {
-            SkDEBUGF(("Do not know weight for: %s (%s) \n", face->family_name, psFontInfo.weight));
+            SkDEBUGF(("Do not know weight for: %s\n", psFontInfo.weight));
         }
     }
 
@@ -1799,5 +1766,6 @@
     }
 
     FT_Done_Face(face);
+    FT_Done_FreeType(library);
     return true;
 }
diff --git a/src/ports/SkFontHost_FreeType_common.h b/src/ports/SkFontHost_FreeType_common.h
index f275d44..79e6d65 100644
--- a/src/ports/SkFontHost_FreeType_common.h
+++ b/src/ports/SkFontHost_FreeType_common.h
@@ -48,17 +48,8 @@
     /** For SkFontMgrs to make use of our ability to extract
      *  name and style from a stream, using FreeType's API.
      */
-    class Scanner {
-    public:
-        Scanner();
-        ~Scanner();
-        bool recognizedFont(SkStream* stream, int* numFonts) const;
-        bool scanFont(SkStream* stream, int ttcIndex,
-                      SkString* name, SkFontStyle* style, bool* isFixedPitch) const;
-    private:
-        FT_Face openFace(SkStream* stream, int ttcIndex) const;
-        FT_Library fLibrary;
-    };
+    static bool ScanFont(SkStream* stream, int ttcIndex,
+                         SkString* name, SkFontStyle* style, bool* isFixedPitch);
 
 protected:
     SkTypeface_FreeType(const SkFontStyle& style, SkFontID uniqueID, bool isFixedPitch)
diff --git a/src/ports/SkFontHost_linux.cpp b/src/ports/SkFontHost_linux.cpp
index 0b99e65..90141f9 100644
--- a/src/ports/SkFontHost_linux.cpp
+++ b/src/ports/SkFontHost_linux.cpp
@@ -22,7 +22,7 @@
 #include <limits>
 
 #ifndef SK_FONT_FILE_PREFIX
-#    define SK_FONT_FILE_PREFIX "/usr/share/fonts/"
+#    define SK_FONT_FILE_PREFIX "/usr/share/fonts/truetype/"
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -275,7 +275,7 @@
         bool isFixedPitch;
         SkFontStyle style;
         SkString name;
-        if (fScanner.scanFont(stream, ttcIndex, &name, &style, &isFixedPitch)) {
+        if (SkTypeface_FreeType::ScanFont(stream, ttcIndex, &name, &style, &isFixedPitch)) {
             return SkNEW_ARGS(SkTypeface_Stream, (style, isFixedPitch, false, name,
                                                   stream, ttcIndex));
         } else {
@@ -314,48 +314,46 @@
 
 private:
 
-    void load_directory_fonts(const SkString& directory, const char* suffix) {
-        SkOSFile::Iter iter(directory.c_str(), suffix);
+    static bool get_name_and_style(const char path[], SkString* name,
+                                   SkFontStyle* style, bool* isFixedPitch) {
+        SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
+        if (stream.get()) {
+            return SkTypeface_FreeType::ScanFont(stream, 0, name, style, isFixedPitch);
+        } else {
+            SkDebugf("---- failed to open <%s> as a font\n", path);
+            return false;
+        }
+    }
+
+    void load_directory_fonts(const SkString& directory) {
+        SkOSFile::Iter iter(directory.c_str(), ".ttf");
         SkString name;
 
         while (iter.next(&name, false)) {
-            SkString filename(SkOSPath::Join(directory.c_str(), name.c_str()));
-            SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(filename.c_str()));
-            if (!stream.get()) {
-                SkDebugf("---- failed to open <%s>\n", filename.c_str());
+            SkString filename(
+                SkOSPath::Join(directory.c_str(), name.c_str()));
+
+            bool isFixedPitch;
+            SkString realname;
+            SkFontStyle style = SkFontStyle(); // avoid uninitialized warning
+            if (!get_name_and_style(filename.c_str(), &realname, &style, &isFixedPitch)) {
+                SkDebugf("------ can't load <%s> as a font\n", filename.c_str());
                 continue;
             }
 
-            int numFaces;
-            if (!fScanner.recognizedFont(stream, &numFaces)) {
-                SkDebugf("---- failed to open <%s> as a font\n", filename.c_str());
-                continue;
+            SkTypeface_Custom* tf = SkNEW_ARGS(SkTypeface_File, (
+                                                style,
+                                                isFixedPitch,
+                                                true,  // system-font (cannot delete)
+                                                realname,
+                                                filename.c_str(), 0));
+
+            SkFontStyleSet_Custom* addTo = this->onMatchFamily(realname.c_str());
+            if (NULL == addTo) {
+                addTo = new SkFontStyleSet_Custom(realname);
+                fFamilies.push_back().reset(addTo);
             }
-
-            for (int faceIndex = 0; faceIndex < numFaces; ++faceIndex) {
-                bool isFixedPitch;
-                SkString realname;
-                SkFontStyle style = SkFontStyle(); // avoid uninitialized warning
-                if (!fScanner.scanFont(stream, faceIndex, &realname, &style, &isFixedPitch)) {
-                    SkDebugf("---- failed to open <%s> <%d> as a font\n",
-                             filename.c_str(), faceIndex);
-                    continue;
-                }
-
-                SkTypeface_Custom* tf = SkNEW_ARGS(SkTypeface_File, (
-                                                    style,
-                                                    isFixedPitch,
-                                                    true,  // system-font (cannot delete)
-                                                    realname,
-                                                    filename.c_str(), 0));
-
-                SkFontStyleSet_Custom* addTo = this->onMatchFamily(realname.c_str());
-                if (NULL == addTo) {
-                    addTo = new SkFontStyleSet_Custom(realname);
-                    fFamilies.push_back().reset(addTo);
-                }
-                addTo->appendTypeface(tf);
-            }
+            addTo->appendTypeface(tf);
         }
 
         SkOSFile::Iter dirIter(directory.c_str());
@@ -364,16 +362,13 @@
                 continue;
             }
             SkString dirname(SkOSPath::Join(directory.c_str(), name.c_str()));
-            load_directory_fonts(dirname, suffix);
+            load_directory_fonts(dirname);
         }
     }
 
     void load_system_fonts(const char* dir) {
         SkString baseDirectory(dir);
-        load_directory_fonts(baseDirectory, ".ttf");
-        load_directory_fonts(baseDirectory, ".ttc");
-        load_directory_fonts(baseDirectory, ".otf");
-        load_directory_fonts(baseDirectory, ".pfb");
+        load_directory_fonts(baseDirectory);
 
         if (fFamilies.empty()) {
             SkFontStyleSet_Custom* family = new SkFontStyleSet_Custom(SkString());
@@ -411,7 +406,6 @@
     SkTArray<SkAutoTUnref<SkFontStyleSet_Custom>, true> fFamilies;
     SkFontStyleSet_Custom* gDefaultFamily;
     SkTypeface* gDefaultNormal;
-    SkTypeface_FreeType::Scanner fScanner;
 };
 
 SkFontMgr* SkFontMgr::Factory() {
diff --git a/src/ports/SkFontMgr_android.cpp b/src/ports/SkFontMgr_android.cpp
index 4677a1f..c527551 100644
--- a/src/ports/SkFontMgr_android.cpp
+++ b/src/ports/SkFontMgr_android.cpp
@@ -138,9 +138,7 @@
 
 class SkFontStyleSet_Android : public SkFontStyleSet {
 public:
-    explicit SkFontStyleSet_Android(const FontFamily& family, const char* basePath,
-                                    const SkTypeface_FreeType::Scanner& scanner)
-    {
+    explicit SkFontStyleSet_Android(const FontFamily& family, const char* basePath) {
         const SkString* cannonicalFamilyName = NULL;
         if (family.fNames.count() > 0) {
             cannonicalFamilyName = &family.fNames[0];
@@ -162,7 +160,8 @@
             SkString familyName;
             SkFontStyle style;
             bool isFixedWidth;
-            if (!scanner.scanFont(stream.get(), ttcIndex, &familyName, &style, &isFixedWidth)) {
+            if (!SkTypeface_FreeType::ScanFont(stream.get(), ttcIndex,
+                                               &familyName, &style, &isFixedWidth)) {
                 DEBUG_FONT(("---- SystemFonts[%d] file=%s (INVALID)", i, pathName.c_str()));
                 continue;
             }
@@ -436,7 +435,7 @@
         bool isFixedPitch;
         SkFontStyle style;
         SkString name;
-        if (!fScanner.scanFont(stream, ttcIndex, &name, &style, &isFixedPitch)) {
+        if (!SkTypeface_FreeType::ScanFont(stream, ttcIndex, &name, &style, &isFixedPitch)) {
             return NULL;
         }
         return SkNEW_ARGS(SkTypeface_AndroidStream, (stream, ttcIndex,
@@ -461,8 +460,6 @@
 
 private:
 
-    SkTypeface_FreeType::Scanner fScanner;
-
     SkTArray<SkAutoTUnref<SkFontStyleSet_Android>, true> fFontStyleSets;
     SkFontStyleSet* fDefaultFamily;
     SkTypeface* fDefaultTypeface;
@@ -484,8 +481,7 @@
                 }
             }
 
-            SkFontStyleSet_Android* newSet =
-                SkNEW_ARGS(SkFontStyleSet_Android, (family, basePath, fScanner));
+            SkFontStyleSet_Android* newSet = SkNEW_ARGS(SkFontStyleSet_Android, (family, basePath));
             if (0 == newSet->count()) {
                 SkDELETE(newSet);
                 continue;
diff --git a/src/ports/SkFontMgr_fontconfig.cpp b/src/ports/SkFontMgr_fontconfig.cpp
index 815d9f9..d7570d9 100644
--- a/src/ports/SkFontMgr_fontconfig.cpp
+++ b/src/ports/SkFontMgr_fontconfig.cpp
@@ -452,7 +452,6 @@
 class SkFontMgr_fontconfig : public SkFontMgr {
     mutable SkAutoFcConfig fFC;
     SkAutoTUnref<SkDataTable> fFamilyNames;
-    SkTypeface_FreeType::Scanner fScanner;
 
     class StyleSet : public SkFontStyleSet {
     public:
@@ -828,7 +827,7 @@
 
         SkFontStyle style;
         bool isFixedWidth = false;
-        if (!fScanner.scanFont(stream, ttcIndex, NULL, &style, &isFixedWidth)) {
+        if (!SkTypeface_FreeType::ScanFont(stream, ttcIndex, NULL, &style, &isFixedWidth)) {
             return NULL;
         }