diff --git a/ANNOUNCE b/ANNOUNCE
index b39087333..1c70fa847 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -321,6 +321,7 @@ version 1.5.0beta38 [July 31, 2010]
     safe but uncast assignments to shorter integers.  Also added a zlib
     VStudio release library project because the latest zlib Official Windows
     build does not include such a thing.
+  Revised png_get_int_16() to be similar to png_get_int_32().
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 2fe021501..c28332feb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2803,6 +2803,7 @@ version 1.5.0beta38 [July 31, 2010]
     safe but uncast assignments to shorter integers.  Also added a zlib
     VStudio release library project because the latest zlib Official Windows
     build does not include such a thing.
+  Revised png_get_int_16() to be similar to png_get_int_32().
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/png.h b/png.h
index cddb6926d..d91c335d4 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.5.0beta38 - July 30, 2010
+ * libpng version 1.5.0beta38 - July 31, 2010
  * Copyright (c) 1998-2010 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -11,7 +11,7 @@
  * Authors and maintainers:
  *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.5.0beta38 - July 30, 2010: Glenn
+ *   libpng versions 0.97, January 1998, through 1.5.0beta38 - July 31, 2010: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -172,7 +172,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.5.0beta38, July 30, 2010, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.5.0beta38, July 31, 2010, are
  * Copyright (c) 2004, 2006-2010 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -284,7 +284,7 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    July 30, 2010
+ *    July 31, 2010
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
@@ -348,7 +348,7 @@
 /* Version information for png.h - this should match the version in png.c */
 #define PNG_LIBPNG_VER_STRING "1.5.0beta38"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.5.0beta38 - July 30, 2010\n"
+     " libpng version 1.5.0beta38 - July 31, 2010\n"
 
 #define PNG_LIBPNG_VER_SONUM   15
 #define PNG_LIBPNG_VER_DLLNUM  15
@@ -1295,11 +1295,9 @@ PNG_EXPORT(void,png_set_filter,(png_structp png_ptr, int method, int filters),,
 PNG_FP_EXPORT(void,png_set_filter_heuristics,(png_structp png_ptr,
     int heuristic_method, int num_weights, png_doublep filter_weights,
     png_doublep filter_costs),,68);
-#if 0 /* TO DO */
 PNG_FIXED_EXPORT(void,png_set_filter_heuristics_fixed,(png_structp png_ptr,
     int heuristic_method, int num_weights, png_fixed_point_p filter_weights,
     png_fixed_point_p filter_costs),,209);
-#endif
 #endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
 
 /* Heuristic used for row filter selection.  These defines should NOT be
@@ -1607,10 +1605,8 @@ PNG_EXPORT(png_uint_32,png_get_y_pixels_per_meter,(png_structp png_ptr,
 /* Returns pixel aspect ratio, computed from pHYs chunk data.  */
 PNG_FP_EXPORT(float,png_get_pixel_aspect_ratio,(png_structp png_ptr,
     png_infop info_ptr),,125);
-#if 0 /* TO DO */
 PNG_FIXED_EXPORT(png_fixed_point,png_get_pixel_aspect_ratio_fixed,
     (png_structp png_ptr, png_infop info_ptr),,210);
-#endif
 
 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
 PNG_EXPORT(png_int_32,png_get_x_offset_pixels,(png_structp png_ptr,
@@ -1820,19 +1816,24 @@ PNG_EXPORT(void,png_set_tRNS,(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_sCAL_SUPPORTED
 PNG_FP_EXPORT(png_uint_32,png_get_sCAL,(png_structp png_ptr, png_infop info_ptr,
     int *unit, double *width, double *height),,168);
+#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+/* NOTE: this API is currently implemented using floating point arithmetic,
+ * consequently it can only be used on systems with floating point support.
+ * In any case the range of values supported by png_fixed_point is small and it
+ * is highly recommended that png_get_sCAL_s be used instead.
+ */
 PNG_FIXED_EXPORT(png_uint_32,png_get_sCAL_fixed,(png_structp png_ptr,
     png_infop info_ptr, int *unit, png_fixed_point *width,
     png_fixed_point *height),,214);
+#endif
 PNG_EXPORT(png_uint_32,png_get_sCAL_s,(png_structp png_ptr,
     png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight),,169);
 
 PNG_FP_EXPORT(void,png_set_sCAL,(png_structp png_ptr, png_infop info_ptr,
     int unit, double width, double height),,170);
-#if 0 /* TO DO */
 PNG_FIXED_EXPORT(void,png_set_sCAL_fixed,(png_structp png_ptr,
    png_infop info_ptr, int unit, png_fixed_point width,
    png_fixed_point height), ,213);
-#endif
 PNG_EXPORT(void,png_set_sCAL_s,(png_structp png_ptr, png_infop info_ptr,
     int unit, png_charp swidth, png_charp sheight),,171);
 #endif /* PNG_sCAL_SUPPORTED */
diff --git a/pngconf.h b/pngconf.h
index 29d9935f0..f886e4fbb 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.5.0beta38 - July 30, 2010
+ * libpng version 1.5.0beta38 - July 31, 2010
  *
  * Copyright (c) 1998-2010 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngdebug.h b/pngdebug.h
index 10c7f14a2..b7bbd2b51 100644
--- a/pngdebug.h
+++ b/pngdebug.h
@@ -5,7 +5,7 @@
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
- * Last changed in libpng version 1.5.0 - July 30, 2010
+ * Last changed in libpng version 1.5.0 - July 31, 2010
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
diff --git a/pnginfo.h b/pnginfo.h
index a32d78d06..a79746e36 100644
--- a/pnginfo.h
+++ b/pnginfo.h
@@ -5,7 +5,7 @@
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
- * Last changed in libpng version 1.5.0 - July 30, 2010
+ * Last changed in libpng version 1.5.0 - July 31, 2010
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
diff --git a/pngpriv.h b/pngpriv.h
index df032fed1..b5c9546f0 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -1,7 +1,7 @@
 
 /* pngpriv.h - private declarations for use inside libpng
  *
- * libpng version 1.5.0beta38 - July 30, 2010
+ * libpng version 1.5.0beta38 - July 31, 2010
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2010 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -87,7 +87,7 @@
 #ifndef PNG_ERROR_TEXT_SUPPORTED
 #  define png_error(s1,s2) png_err(s1)
 #  define png_chunk_error(s1,s2) png_err(s1)
-#  define png_fixed_error(s1,s2,s3) png_err(s1)
+#  define png_fixed_error(s1,s2) png_err(s1)
 #endif
 
 #ifndef PNG_EXTERN
@@ -392,7 +392,7 @@
  */
 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
-    ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s, fp),0))
+    ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
 #else
 PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp,
    png_const_charp text));
@@ -1029,22 +1029,30 @@ PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr,
 
 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
 PNG_EXTERN void png_fixed_error PNGARG((png_structp png_ptr,
-    png_const_charp name, double value));
+    png_const_charp name)) PNG_NORETURN;
 #endif
 
 /* ASCII to FP interfaces, currently only implemented if sCAL
  * support is required.
  */
-#if defined(PNG_READ_sCAL_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
+#if defined(PNG_READ_sCAL_SUPPORTED)
 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
  * width or height, derived from the precision (number of significant
  * digits - a build time settable option) and assumpitions about the
  * maximum ridiculous exponent.
  */
 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
 PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii,
     png_size_t size, double fp, unsigned precision));
-#endif /* READ_sCAL && FLOATING_POINT */
+#endif /* FLOATING_POINT */
+
+#ifdef PNG_FIXED_POINT_SUPPORTED
+PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr,
+    png_charp ascii, png_size_t size, png_fixed_point fp));
+#endif /* FIXED_POINT */
+#endif /* READ_sCAL */
 
 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
 /* An internal API to validate the format of a floating point number.
@@ -1119,7 +1127,8 @@ PNG_EXTERN int png_check_fp_number PNGARG((png_charp string, png_size_t size,
 PNG_EXTERN int png_check_fp_string PNGARG((png_charp string, png_size_t size));
 #endif /* pCAL || sCAL */
 
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
+#if defined(PNG_READ_GAMMA_SUPPORTED) ||\
+    defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
 /* Added at libpng version 1.5.0 */
 /* This is a utility to provide a*times/div (rounded) and indicate
  * if there is an overflow.  The result is a boolean - false (0)
diff --git a/pngrutil.c b/pngrutil.c
index c0da7e12b..c910751a6 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -88,8 +88,9 @@ png_get_int_32)(png_bytep buf)
 png_uint_16 (PNGAPI
 png_get_uint_16)(png_bytep buf)
 {
-   png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
-       (png_uint_16)(*(buf + 1)));
+   png_uint_16 i =
+       ((png_uint_32)(*buf) << 8) +
+       ((png_uint_32)(*(buf + 1)));
 
    return (i);
 }
diff --git a/pngstruct.h b/pngstruct.h
index 6f3b57cec..e513c80d0 100644
--- a/pngstruct.h
+++ b/pngstruct.h
@@ -5,7 +5,7 @@
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
- * Last changed in libpng version 1.5.0 - July 30, 2010
+ * Last changed in libpng version 1.5.0 - July 31, 2010
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer