Revert "SkBitmap now really stores SkImageInfo -- config is just a ruse"

src/image/SkImagePriv.cpp

Index: src/image/SkImagePriv.cpp
diff --git a/src/image/SkImagePriv.cpp b/src/image/SkImagePriv.cpp
index a044aad0a0da343ca3eed7d301500d3c3c808da6..43cc44b2fa25aa5762611e3bfcf39e467f2e29f8 100644
--- a/src/image/SkImagePriv.cpp
+++ b/src/image/SkImagePriv.cpp
@@ -37,19 +37,35 @@ SkBitmap::Config SkImageInfoToBitmapConfig(const SkImageInfo& info) {
     return SkColorTypeToBitmapConfig(info.fColorType);
 }
 
-SkColorType SkBitmapConfigToColorType(SkBitmap::Config config) {
-    static const SkColorType gCT[] = {
-        kUnknown_SkColorType,   // kNo_Config
-        kAlpha_8_SkColorType,   // kA8_Config
-        kIndex_8_SkColorType,   // kIndex8_Config
-        kRGB_565_SkColorType,   // kRGB_565_Config
-        kARGB_4444_SkColorType, // kARGB_4444_Config
-        kPMColor_SkColorType,   // kARGB_8888_Config
-    };
-    SkASSERT((unsigned)config < SK_ARRAY_COUNT(gCT));
-    return gCT[config];
+bool SkBitmapConfigToColorType(SkBitmap::Config config, SkColorType* ctOut) {
+    SkColorType ct;
+    switch (config) {
+        case SkBitmap::kA8_Config:
+            ct = kAlpha_8_SkColorType;
+            break;
+        case SkBitmap::kIndex8_Config:
+            ct = kIndex_8_SkColorType;
+            break;
+        case SkBitmap::kRGB_565_Config:
+            ct = kRGB_565_SkColorType;
+            break;
+        case SkBitmap::kARGB_4444_Config:
+            ct = kARGB_4444_SkColorType;
+            break;
+        case SkBitmap::kARGB_8888_Config:
+            ct = kPMColor_SkColorType;
+            break;
+        case SkBitmap::kNo_Config:
+        default:
+            return false;
+    }
+    if (ctOut) {
+        *ctOut = ct;
+    }
+    return true;
 }
 
+
 SkImage* SkNewImageFromBitmap(const SkBitmap& bm, bool canSharePixelRef) {
     SkImageInfo info;
     if (!bm.asImageInfo(&info)) {