Adding png scanline decoding to kIndex8

src/codec/SkCodecPriv.h

Index: src/codec/SkCodecPriv.h
diff --git a/src/codec/SkCodecPriv.h b/src/codec/SkCodecPriv.h
index da7574677c375a154b3a1ca6a78f472f1e3a0e13..98b2d3aae5f01c52fd63232c1d558780512d11b6 100644
--- a/src/codec/SkCodecPriv.h
+++ b/src/codec/SkCodecPriv.h
@@ -8,9 +8,11 @@
 #ifndef SkCodecPriv_DEFINED
 #define SkCodecPriv_DEFINED
 
+#include "SkColorTable.h"
 #include "SkImageInfo.h"
 #include "SkSwizzler.h"
 #include "SkTypes.h"
+#include "SkUtils.h"
 
 /*
  *
@@ -30,6 +32,21 @@
 
 /*
  *
+ * Copy the codec color table back to the client when kIndex8 color type is requested
+ *
+ */
+static inline void copy_color_table(const SkImageInfo& dstInfo, SkColorTable* colorTable,
+        SkPMColor* inputColorPtr, int* inputColorCount) {
+    if (kIndex_8_SkColorType == dstInfo.colorType()) {
+        SkASSERT(NULL != inputColorPtr);
+        SkASSERT(NULL != inputColorCount);
+        SkASSERT(NULL != colorTable);
+        sk_memcpy32(inputColorPtr, colorTable->readColors(), *inputColorCount);
+    }
+}
+
+/*
+ *
  * Compute row bytes for an image using pixels per byte
  *
  */