change colortable to use factory for reinflating, check for empty

src/core/SkBitmap.cpp

 /*
  * Copyright 2008 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 "SkAtomics.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 1127 matching lines @@
         for (int y = height - 1; y >= 1; --y) {
             memmove(dstRow, srcRow, snugRB);
             srcRow -= snugRB;
             dstRow -= ramRB;
         }
         SkASSERT(srcRow == dstRow); // first row does not need to be moved
     }
 
     SkAutoTUnref<SkColorTable> ctable;
     if (buffer->readBool()) {
-        ctable.reset(new SkColorTable(*buffer));
+        ctable.reset(SkColorTable::Create(*buffer));
+        if (!ctable) {
+            return false;
+        }
 
-        unsigned char maxIndex = ctable->count() ? ctable->count()-1 : 0;
-        for (uint64_t i = 0; i < ramSize; ++i) {
-            dst[i] = SkTMin(dst[i], maxIndex);
+        if (info.isEmpty()) {
+            // require an empty ctable
+            if (ctable->count() != 0) {
+                buffer->validate(false);
+                return false;
+            }
+        } else {
+            // require a non-empty ctable
+            if (ctable->count() == 0) {
+                buffer->validate(false);
+                return false;
+            }
+            unsigned char maxIndex = ctable->count() - 1;
+            for (uint64_t i = 0; i < ramSize; ++i) {
+                dst[i] = SkTMin(dst[i], maxIndex);
+            }
         }
     }
 
     SkAutoTUnref<SkPixelRef> pr(SkMallocPixelRef::NewWithData(info, info.minRowBytes(),
                                                               ctable.get(), data.get()));
     if (!pr.get()) {
         return false;
     }
     bitmap->setInfo(pr->info());
     bitmap->setPixelRef(pr, 0, 0);
@@ skipping 137 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifdef SK_DEBUG
 void SkImageInfo::validate() const {
     SkASSERT(fWidth >= 0);
     SkASSERT(fHeight >= 0);
     SkASSERT(SkColorTypeIsValid(fColorType));
     SkASSERT(SkAlphaTypeIsValid(fAlphaType));
 }
 #endif