eliminate code related to SkBitmap::Config

src/images/SkImageDecoder.cpp

Index: src/images/SkImageDecoder.cpp
diff --git a/src/images/SkImageDecoder.cpp b/src/images/SkImageDecoder.cpp
index 0e2018c11768c9a646926f354aba0eb1ad7f3d1e..ed2ad164a11aea72d8b171b42c084fb813eeb1aa 100644
--- a/src/images/SkImageDecoder.cpp
+++ b/src/images/SkImageDecoder.cpp
@@ -24,9 +24,6 @@ SkImageDecoder::SkImageDecoder()
     , fDefaultPref(kUnknown_SkColorType)
     , fPreserveSrcDepth(false)
     , fDitherImage(true)
-#ifdef SK_SUPPORT_LEGACY_BITMAP_CONFIG
-    , fUsePrefTable(false)
-#endif
     , fSkipWritingZeroes(false)
     , fPreferQualityOverSpeed(false)
     , fRequireUnpremultipliedColors(false) {
@@ -50,13 +47,6 @@ void SkImageDecoder::copyFieldsToOther(SkImageDecoder* other) {
 #endif
     other->setAllocator(fAllocator);
     other->setSampleSize(fSampleSize);
-#ifdef SK_SUPPORT_LEGACY_BITMAP_CONFIG
-    if (fUsePrefTable) {
-        other->setPrefConfigTable(fPrefTable);
-    } else {
-        other->fDefaultPref = fDefaultPref;
-    }
-#endif
     other->setPreserveSrcDepth(fPreserveSrcDepth);
     other->setDitherImage(fDitherImage);
     other->setSkipWritingZeroes(fSkipWritingZeroes);
@@ -148,38 +138,8 @@ bool SkImageDecoder::allocPixelRef(SkBitmap* bitmap,
 
 ///////////////////////////////////////////////////////////////////////////////
 
-#ifdef SK_SUPPORT_LEGACY_BITMAP_CONFIG
-void SkImageDecoder::setPrefConfigTable(const PrefConfigTable& prefTable) {
-    fUsePrefTable = true;
-    fPrefTable = prefTable;
-}
-#endif
-
-// TODO: use colortype in fPrefTable, fDefaultPref so we can stop using SkBitmapConfigToColorType()
-//
 SkColorType SkImageDecoder::getPrefColorType(SrcDepth srcDepth, bool srcHasAlpha) const {
     SkColorType ct = fDefaultPref;
-#ifdef SK_SUPPORT_LEGACY_BITMAP_CONFIG
-    if (fUsePrefTable) {
-        // Until we kill or change the PrefTable, we have to go into Config land for a moment.
-        SkBitmap::Config config = SkBitmap::kNo_Config;
-        switch (srcDepth) {
-            case kIndex_SrcDepth:
-                config = srcHasAlpha ? fPrefTable.fPrefFor_8Index_YesAlpha_src
-                                     : fPrefTable.fPrefFor_8Index_NoAlpha_src;
-                break;
-            case k8BitGray_SrcDepth:
-                config = fPrefTable.fPrefFor_8Gray_src;
-                break;
-            case k32Bit_SrcDepth:
-                config = srcHasAlpha ? fPrefTable.fPrefFor_8bpc_YesAlpha_src
-                                     : fPrefTable.fPrefFor_8bpc_NoAlpha_src;
-                break;
-        }
-        // now return to SkColorType land
-        ct = SkBitmapConfigToColorType(config);
-    }
-#endif
     if (fPreserveSrcDepth) {
         switch (srcDepth) {
             case kIndex_SrcDepth: