libwebp: update to 0.4.1

third_party/libwebp/dec/webpi.h

Index: third_party/libwebp/dec/webpi.h
diff --git a/third_party/libwebp/dec/webpi.h b/third_party/libwebp/dec/webpi.h
index d915f5ef6ffe8fa88c91183a2c9392ea5c6d12d5..457c72eda4851aa66cac290391263e81c1a3b2dc 100644
--- a/third_party/libwebp/dec/webpi.h
+++ b/third_party/libwebp/dec/webpi.h
@@ -54,6 +54,7 @@ void WebPResetDecParams(WebPDecParams* const params);
 typedef struct {
   const uint8_t* data;         // input buffer
   size_t data_size;            // input buffer size
+  int have_all_data;           // true if all data is known to be available
   size_t offset;               // offset to main data chunk (VP8 or VP8L)
   const uint8_t* alpha_data;   // points to alpha chunk (if present)
   size_t alpha_data_size;      // alpha chunk size
@@ -93,10 +94,15 @@ int WebPIoInitFromOptions(const WebPDecoderOptions* const options,
 // dimension / etc.). If *options is not NULL, also verify that the options'
 // parameters are valid and apply them to the width/height dimensions of the
 // output buffer. This takes cropping / scaling / rotation into account.
+// Also incorporates the options->flip flag to flip the buffer parameters if
+// needed.
 VP8StatusCode WebPAllocateDecBuffer(int width, int height,
                                     const WebPDecoderOptions* const options,
                                     WebPDecBuffer* const buffer);
 
+// Flip buffer vertically by negating the various strides.
+VP8StatusCode WebPFlipBuffer(WebPDecBuffer* const buffer);
+
 // Copy 'src' into 'dst' buffer, making sure 'dst' is not marked as owner of the
 // memory (still held by 'src').
 void WebPCopyDecBuffer(const WebPDecBuffer* const src,
@@ -105,8 +111,6 @@ void WebPCopyDecBuffer(const WebPDecBuffer* const src,
 // Copy and transfer ownership from src to dst (beware of parameter order!)
 void WebPGrabDecBuffer(WebPDecBuffer* const src, WebPDecBuffer* const dst);
 
-
-
 //------------------------------------------------------------------------------
 
 #ifdef __cplusplus