Guard the lossless encoder (in flux) under a flag

Change-Id: I6dd8fd17089c199001c06b1afde14233dc3e3234

src/utils/bit_writer.c

@@ -187,6 +187,7 @@ void VP8BitWriterWipeOut(VP8BitWriter* const bw) {
   }
 }
 
+#ifdef USE_LOSSLESS_ENCODER
 //------------------------------------------------------------------------------
 // VP8LBitWriter
 
@@ -264,6 +265,7 @@ void VP8LWriteBits(VP8LBitWriter* const bw, int n_bits, uint32_t bits) {
   }
 }
 
+#endif
 
 //------------------------------------------------------------------------------
 

src/utils/bit_writer.h

@@ -64,6 +64,7 @@ static WEBP_INLINE size_t VP8BitWriterSize(const VP8BitWriter* const bw) {
   return bw->pos_;
 }
 
+#ifdef USE_LOSSLESS_ENCODER
 //------------------------------------------------------------------------------
 // VP8LBitWriter
 // TODO(vikasa): VP8LBitWriter is copied as-is from lossless code. There's scope
@@ -115,6 +116,7 @@ void VP8LBitWriterDestroy(VP8LBitWriter* const bw);
 void VP8LWriteBits(VP8LBitWriter* const bw, int n_bits, uint32_t bits);
 
 //------------------------------------------------------------------------------
+#endif
 
 #if defined(__cplusplus) || defined(c_plusplus)
 }    // extern "C"

src/utils/color_cache.h

@@ -39,6 +39,7 @@ static WEBP_INLINE void VP8LColorCacheInsert(const VP8LColorCache* const cc,
   cc->colors_[key] = argb;
 }
 
+#ifdef USE_LOSSLESS_ENCODER
 static WEBP_INLINE int VP8LColorCacheGetIndex(const VP8LColorCache* const cc,
                                               uint32_t argb) {
   return (kHashMul * argb) >> cc->hash_shift_;
@@ -49,6 +50,7 @@ static WEBP_INLINE int VP8LColorCacheContains(const VP8LColorCache* const cc,
   const uint32_t key = (kHashMul * argb) >> cc->hash_shift_;
   return cc->colors_[key] == argb;
 }
+#endif
 
 //------------------------------------------------------------------------------
 

src/utils/huffman_encode.c

@@ -9,6 +9,8 @@
 //
 // Flate like entropy encoding (Huffman) for webp lossless.
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include "./huffman_encode.h"
 
 #include <stdint.h>
@@ -311,3 +313,5 @@ void ConvertBitDepthsToSymbols(const uint8_t* depth, int len,
     }
   }
 }
+
+#endif

src/utils/huffman_encode.h

@@ -12,6 +12,8 @@
 #ifndef WEBP_UTILS_HUFFMAN_ENCODE_H_
 #define WEBP_UTILS_HUFFMAN_ENCODE_H_
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include <stdint.h>
 
 #if defined(__cplusplus) || defined(c_plusplus)
@@ -49,4 +51,6 @@ void ConvertBitDepthsToSymbols(const uint8_t* depth, int len, uint16_t* bits);
 }
 #endif
 
+#endif
+
 #endif  // WEBP_UTILS_HUFFMAN_ENCODE_H_