libwebp: update to 0.4.1

third_party/libwebp/dec/vp8i.h

Index: third_party/libwebp/dec/vp8i.h
diff --git a/third_party/libwebp/dec/vp8i.h b/third_party/libwebp/dec/vp8i.h
index 3f4cf297d9952b81fcb2d4496f2cb85a637c2b28..7cc1840f5c1f84b4fa76c1d5dab5184dd2e87df0 100644
--- a/third_party/libwebp/dec/vp8i.h
+++ b/third_party/libwebp/dec/vp8i.h
@@ -31,7 +31,7 @@ extern "C" {
 // version numbers
 #define DEC_MAJ_VERSION 0
 #define DEC_MIN_VERSION 4
-#define DEC_REV_VERSION 0
+#define DEC_REV_VERSION 1
 
 // intra prediction modes
 enum { B_DC_PRED = 0,   // 4x4 modes
@@ -195,6 +195,8 @@ typedef struct {
   uint32_t non_zero_y_;
   uint32_t non_zero_uv_;
   uint8_t dither_;      // local dithering strength (deduced from non_zero_*)
+  uint8_t skip_;
+  uint8_t segment_;
 } VP8MBData;
 
 // Persistent information needed by the parallel processing
@@ -265,7 +267,6 @@ struct VP8Decoder {
   uint8_t* intra_t_;      // top intra modes values: 4 * mb_w_
   uint8_t  intra_l_[4];   // left intra modes values
 
-  uint8_t segment_;       // segment of the currently parsed block
   VP8TopSamples* yuv_t_;  // top y/u/v samples
 
   VP8MB* mb_info_;        // contextual macroblock info (mb_w_ + 1)
@@ -295,12 +296,8 @@ struct VP8Decoder {
   const uint8_t* alpha_data_;     // compressed alpha data (if present)
   size_t alpha_data_size_;
   int is_alpha_decoded_;  // true if alpha_data_ is decoded in alpha_plane_
-  uint8_t* alpha_plane_;        // output. Persistent, contains the whole data.
-
-  // extensions
-  int layer_colorspace_;
-  const uint8_t* layer_data_;   // compressed layer data (if present)
-  size_t layer_data_size_;
+  uint8_t* alpha_plane_;  // output. Persistent, contains the whole data.
+  int alpha_dithering_;   // derived from decoding options (0=off, 100=full).
 };
 
 //------------------------------------------------------------------------------
@@ -313,7 +310,8 @@ int VP8SetError(VP8Decoder* const dec,
 // in tree.c
 void VP8ResetProba(VP8Proba* const proba);
 void VP8ParseProba(VP8BitReader* const br, VP8Decoder* const dec);
-void VP8ParseIntraMode(VP8BitReader* const br,  VP8Decoder* const dec);
+// parses one row of intra mode data in partition 0, returns !eof
+int VP8ParseIntraModeRow(VP8BitReader* const br, VP8Decoder* const dec);
 
 // in quant.c
 void VP8ParseQuant(VP8Decoder* const dec);
@@ -347,9 +345,6 @@ int VP8DecodeMB(VP8Decoder* const dec, VP8BitReader* const token_br);
 const uint8_t* VP8DecompressAlphaRows(VP8Decoder* const dec,
                                       int row, int num_rows);
 
-// in layer.c
-int VP8DecodeLayer(VP8Decoder* const dec);
-
 //------------------------------------------------------------------------------
 
 #ifdef __cplusplus