[libpng16] Fix copyright in sse code, use C-style comments

1 files changed, 14 insertions, 8 deletions

diff --git a/contrib/intel/intel_init.c b/contrib/intel/intel_init.c
index 80fcfc2ec..fc0d9abfd 100644
--- a/contrib/intel/intel_init.c
+++ b/contrib/intel/intel_init.c
@@ -2,6 +2,9 @@
 /* intel_init.c - SSE2 optimized filter functions
  *
  * Copyright (c) 2016 Google, Inc.
+ * Written by Mike Klein and Matt Sarett
+ * Derived from arm/arm_init.c, which was
+ * Copyright (c) 2014 Glenn Randers-Pehrson
  *
  * Last changed in libpng 1.6.22 [(PENDING RELEASE)]
  *
@@ -18,13 +21,14 @@
 void
 png_init_filter_functions_sse2(png_structp pp, unsigned int bpp)
 {
-   // The techniques used to implement each of these filters in SSE operate on
-   // one pixel at a time.
-   // So they generally speed up 3bpp images about 3x, 4bpp images about 4x.
-   // They can scale up to 6 and 8 bpp images and down to 2 bpp images, 
-   // but they'd not likely have any benefit for 1bpp images.
-   // Most of these can be implemented using only MMX and 64-bit registers,
-   // but they end up a bit slower than using the equally-ubiquitous SSE2.
+   /* The techniques used to implement each of these filters in SSE operate on
+    * one pixel at a time.
+    * So they generally speed up 3bpp images about 3x, 4bpp images about 4x.
+    * They can scale up to 6 and 8 bpp images and down to 2 bpp images,
+    * but they'd not likely have any benefit for 1bpp images.
+    * Most of these can be implemented using only MMX and 64-bit registers,
+    * but they end up a bit slower than using the equally-ubiquitous SSE2.
+   */
    if (bpp == 3)
    {
       pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_sse2;
@@ -40,7 +44,9 @@ png_init_filter_functions_sse2(png_structp pp, unsigned int bpp)
           png_read_filter_row_paeth4_sse2;
    }
 
-   // No need optimize PNG_FILTER_VALUE_UP.  The compiler should autovectorize.
+   /* No need optimize PNG_FILTER_VALUE_UP.  The compiler should
+    * autovectorize.
+    */
 }
 
 #endif /* PNG_INTEL_SSE_IMPLEMENTATION > 0 */