Revert of Parallel cache - preliminary (patchset #22 id:420001 of https://codereview.chromium.org/1264103003/ )

Reason for revert:
Seems to freeze android devices.

Original issue's description:
> Parallel cache.
>
> TBR=reed@google.com
>
> BUG=skia:1330
>
> Committed: https://skia.googlesource.com/skia/+/6f2a486040cb25465990196c229feb47e668e87f

TBR=reed@google.com,mtklein@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:1330

Review URL: https://codereview.chromium.org/1327703003

1 files changed, 16 insertions, 49 deletions

diff --git a/src/core/SkGlyphCache.h b/src/core/SkGlyphCache.h
index cf64527b49..4eb6b5bc60 100644
--- a/src/core/SkGlyphCache.h
+++ b/src/core/SkGlyphCache.h
@@ -11,11 +11,8 @@
 #include "SkChunkAlloc.h"
 #include "SkDescriptor.h"
 #include "SkGlyph.h"
-#include "SkMutex.h"
 #include "SkTHash.h"
 #include "SkScalerContext.h"
-#include "SkSharedMutex.h"
-#include "SkSpinlock.h"
 #include "SkTemplates.h"
 #include "SkTDArray.h"
 
@@ -122,23 +119,12 @@ public:
 
     SkScalerContext* getScalerContext() const { return fScalerContext; }
 
-    struct GlyphAndCache {
-        SkGlyphCache* cache;
-        const SkGlyph* glyph;
-    };
-
-    static void OnceFillInImage(GlyphAndCache gc);
-
-    static void OnceFillInPath(GlyphAndCache gc);
-
-    typedef bool (*VisitProc)(const SkGlyphCache*, void*);
-
     /** Find a matching cache entry, and call proc() with it. If none is found create a new one.
         If the proc() returns true, detach the cache and return it, otherwise leave it and return
         nullptr.
     */
     static SkGlyphCache* VisitCache(SkTypeface*, const SkDescriptor* desc,
-                                    VisitProc proc,
+                                    bool (*proc)(const SkGlyphCache*, void*),
                                     void* context);
 
     /** Given a strike that was returned by either VisitCache() or DetachCache() add it back into
@@ -195,21 +181,18 @@ public:
 private:
     friend class SkGlyphCache_Globals;
 
+    enum {
+        kHashBits           = 8,
+        kHashCount          = 1 << kHashBits,
+        kHashMask           = kHashCount - 1
+    };
+
     typedef uint32_t PackedGlyphID;    // glyph-index + subpixel-pos
     typedef uint32_t PackedUnicharID;  // unichar + subpixel-pos
 
     struct CharGlyphRec {
-        class HashTraits {
-        public:
-            static PackedUnicharID GetKey(const CharGlyphRec& rec) {
-                return rec.fPackedUnicharID;
-            }
-            static uint32_t Hash(PackedUnicharID unicharID) {
-                return SkChecksum::CheapMix(unicharID);
-            }
-        };
-        PackedUnicharID fPackedUnicharID;
-        PackedGlyphID fPackedGlyphID;
+        PackedUnicharID    fPackedUnicharID;
+        PackedGlyphID      fPackedGlyphID;
     };
 
     struct AuxProcRec {
@@ -222,9 +205,6 @@ private:
     SkGlyphCache(SkTypeface*, const SkDescriptor*, SkScalerContext*);
     ~SkGlyphCache();
 
-    // Increase the memory used keeping the cache and the global size in sync.
-    void increaseMemoryUsed(size_t used);
-
     // Return the SkGlyph* associated with MakeID. The id parameter is the
     // combined glyph/x/y id generated by MakeID. If it is just a glyph id
     // then x and y are assumed to be zero.
@@ -236,45 +216,32 @@ private:
     // Return a new SkGlyph for the glyph ID and subpixel position id.
     SkGlyph* allocateNewGlyph(PackedGlyphID packedGlyphID);
 
-    // Add the full metrics to an existing glyph.
-    void addFullMetrics(SkGlyph* glyph);
-
     static bool DetachProc(const SkGlyphCache*, void*) { return true; }
 
-    CharGlyphRec PackedUnicharIDtoCharGlyphRec(PackedUnicharID packedUnicharID);
-
     // The id arg is a combined id generated by MakeID.
     CharGlyphRec* getCharGlyphRec(PackedUnicharID id);
 
+    void invokeAndRemoveAuxProcs();
+
     inline static SkGlyphCache* FindTail(SkGlyphCache* head);
 
-    // The following are protected by the SkGlyphCache_Globals fLock mutex.
-    // Note: the following fields are protected by a mutex in a different class.
     SkGlyphCache*          fNext;
     SkGlyphCache*          fPrev;
     SkDescriptor* const    fDesc;
+    SkScalerContext* const fScalerContext;
     SkPaint::FontMetrics   fFontMetrics;
-    int                    fRefCount;
 
-    // The following fields are protected by fMapMutex.
-    mutable SkSharedMutex fMapMutex;
     // Map from a combined GlyphID and sub-pixel position to a SkGlyph.
     SkTHashTable<SkGlyph, PackedGlyphID, SkGlyph::HashTraits> fGlyphMap;
+
     SkChunkAlloc           fGlyphAlloc;
-    typedef SkTHashTable<CharGlyphRec, PackedUnicharID, CharGlyphRec::HashTraits>
-            PackedUnicharIDToPackedGlyphIDMap;
-    SkAutoTDelete<PackedUnicharIDToPackedGlyphIDMap> fPackedUnicharIDToPackedGlyphID;
+
+    SkAutoTArray<CharGlyphRec> fPackedUnicharIDToPackedGlyphID;
+
     // used to track (approx) how much ram is tied-up in this cache
     size_t                 fMemoryUsed;
 
-    // The FScalerMutex protects the following fields. It is mainly used to ensure single-threaded
-    // access to the font scaler, but it also protects the fAuxProcList.
-    mutable SkMutex        fScalerMutex;
-    SkScalerContext* const fScalerContext;
     AuxProcRec*            fAuxProcList;
-
-    // BEWARE: Mutex ordering
-    // If you need to hold both fMapMutex and fScalerMutex then fMapMutex must be held first.
 };
 
 class SkAutoGlyphCacheBase {