Implementing filling for SkBmpCodec

src/codec/SkSwizzler.cpp

Index: src/codec/SkSwizzler.cpp
diff --git a/src/codec/SkSwizzler.cpp b/src/codec/SkSwizzler.cpp
index 754b08883544928f7066456b409420d52a596e84..350100be2deae41db07a8c1c4a0f7f83f8e18d7f 100644
--- a/src/codec/SkSwizzler.cpp
+++ b/src/codec/SkSwizzler.cpp
@@ -423,12 +423,17 @@ SkSwizzler::ResultAlpha SkSwizzler::next(const uint8_t* SK_RESTRICT src,
 }
 
 void SkSwizzler::Fill(void* dst, const SkImageInfo& dstInfo, size_t dstRowBytes, uint32_t y,
-        uint32_t colorOrIndex, SkPMColor* colorTable) {
+        uint32_t colorOrIndex, const SkPMColor* colorTable, bool bottomUp) {
     SkASSERT(dst != NULL);
     SkASSERT(y < (uint32_t) dstInfo.height());
 
     // Get dst start row
-    void* dstRow = SkTAddOffset<void*>(dst, y * dstRowBytes);
+    void* dstRow;
+    if (bottomUp) {
+        dstRow = dst;
+    } else {
+        dstRow = SkTAddOffset<void*>(dst, y * dstRowBytes);
+    }
 
     // Calculate remaining bytes.  This is tricky since the final row may not be padded.
     const size_t totalBytes = dstInfo.getSafeSize(dstRowBytes);