Initial error handling code

src/core/SkFlattenable.cpp

Index: src/core/SkFlattenable.cpp
diff --git a/src/core/SkFlattenable.cpp b/src/core/SkFlattenable.cpp
index b4efe91004845cb3b00ebfc8b6d3d1131374fce7..b171e04511ef33611c7d78e086c3228a5e12c025 100644
--- a/src/core/SkFlattenable.cpp
+++ b/src/core/SkFlattenable.cpp
@@ -63,64 +63,83 @@ void SkRefCntSet::decPtr(void* ptr) {
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 
-#define MAX_PAIR_COUNT  1024
+#define MAX_ENTRY_COUNT  1024
 
-struct Pair {
-    const char*             fName;
-    SkFlattenable::Factory  fFactory;
+struct Entry {
+    const char*                 fName;
+    SkFlattenable::Factory      fFactory;
+    SkFlattenable::TypeCheck    fTypeCheck;
 };
 
 static int gCount;
-static Pair gPairs[MAX_PAIR_COUNT];
+static Entry gEntries[MAX_ENTRY_COUNT];
 
-void SkFlattenable::Register(const char name[], Factory factory) {
+void SkFlattenable::Register(const char name[], Factory factory, TypeCheck typeCheck) {
     SkASSERT(name);
     SkASSERT(factory);
+    SkASSERT(typeCheck);
 
-    static bool gOnce;
+    static bool gOnce = false;
     if (!gOnce) {
         gCount = 0;
         gOnce = true;
     }
 
-    SkASSERT(gCount < MAX_PAIR_COUNT);
+    SkASSERT(gCount < MAX_ENTRY_COUNT);
 
-    gPairs[gCount].fName = name;
-    gPairs[gCount].fFactory = factory;
+    gEntries[gCount].fName = name;
+    gEntries[gCount].fFactory = factory;
+    gEntries[gCount].fTypeCheck = typeCheck;
     gCount += 1;
 }
 
 #ifdef SK_DEBUG
 static void report_no_entries(const char* functionName) {
     if (!gCount) {
-        SkDebugf("%s has no registered name/factory pairs."
-                 " Call SkGraphics::Init() at process initialization time.",
+        SkDebugf("%s has no registered name/factory/type entries."
+                 " Call SkFlattenable::InitializeFlattenablesIfNeeded() before using gEntries",
                  functionName);
     }
 }
 #endif
 
 SkFlattenable::Factory SkFlattenable::NameToFactory(const char name[]) {
+    InitializeFlattenablesIfNeeded();
 #ifdef SK_DEBUG
     report_no_entries(__FUNCTION__);
 #endif
-    const Pair* pairs = gPairs;
+    const Entry* entries = gEntries;
     for (int i = gCount - 1; i >= 0; --i) {
-        if (strcmp(pairs[i].fName, name) == 0) {
-            return pairs[i].fFactory;
+        if (strcmp(entries[i].fName, name) == 0) {
+            return entries[i].fFactory;
+        }
+    }
+    return NULL;
+}
+
+SkFlattenable::TypeCheck SkFlattenable::NameToTypeCheck(const char name[]) {
+    InitializeFlattenablesIfNeeded();
+#ifdef SK_DEBUG
+    report_no_entries(__FUNCTION__);
+#endif
+    const Entry* entries = gEntries;
+    for (int i = gCount - 1; i >= 0; --i) {
+        if (strcmp(entries[i].fName, name) == 0) {
+            return entries[i].fTypeCheck;
         }
     }
     return NULL;
 }
 
 const char* SkFlattenable::FactoryToName(Factory fact) {
+    InitializeFlattenablesIfNeeded();
 #ifdef SK_DEBUG
     report_no_entries(__FUNCTION__);
 #endif
-    const Pair* pairs = gPairs;
+    const Entry* entries = gEntries;
     for (int i = gCount - 1; i >= 0; --i) {
-        if (pairs[i].fFactory == fact) {
-            return pairs[i].fName;
+        if (entries[i].fFactory == fact) {
+            return entries[i].fName;
         }
     }
     return NULL;