Update libpng to 1.6.58

Author: halx99

3rdparty/README.md

@@ -199,7 +199,7 @@
 
 ## png
 - [![Upstream](https://img.shields.io/github/v/tag/glennrp/libpng?label=Upstream)](https://github.com/glennrp/libpng)
-- Version: 1.6.57
+- Version: 1.6.58
 - License: PNG Reference Library License version 2
 
 ## poly2tri

3rdparty/png/png.c

@@ -13,7 +13,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_57 Your_png_h_is_not_version_1_6_57;
+typedef png_libpng_version_1_6_58 Your_png_h_is_not_version_1_6_58;
 
 /* Sanity check the chunks definitions - PNG_KNOWN_CHUNKS from pngpriv.h and the
  * corresponding macro definitions.  This causes a compile time failure if
@@ -820,7 +820,7 @@ png_get_copyright(png_const_structrp png_ptr)
    return PNG_STRING_COPYRIGHT
 #else
    return PNG_STRING_NEWLINE \
-      "libpng version 1.6.57" PNG_STRING_NEWLINE \
+      "libpng version 1.6.58" PNG_STRING_NEWLINE \
       "Copyright (c) 2018-2026 Cosmin Truta" PNG_STRING_NEWLINE \
       "Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson" \
       PNG_STRING_NEWLINE \

3rdparty/png/png.h

@@ -1,6 +1,6 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.57
+ * libpng version 1.6.58
  *
  * Copyright (c) 2018-2026 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
@@ -14,7 +14,7 @@
  *   libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
  *   libpng versions 0.97, January 1998, through 1.6.35, July 2018:
  *     Glenn Randers-Pehrson
- *   libpng versions 1.6.36, December 2018, through 1.6.57, April 2026:
+ *   libpng versions 1.6.36, December 2018, through 1.6.58, April 2026:
  *     Cosmin Truta
  *   See also "Contributing Authors", below.
  */
@@ -238,7 +238,7 @@
  *    ...
  *    1.5.30                  15    10530  15.so.15.30[.0]
  *    ...
- *    1.6.57                  16    10657  16.so.16.57[.0]
+ *    1.6.58                  16    10658  16.so.16.58[.0]
  *
  *    Henceforth the source version will match the shared-library major and
  *    minor numbers; the shared-library major version number will be used for
@@ -274,7 +274,7 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.57"
+#define PNG_LIBPNG_VER_STRING "1.6.58"
 #define PNG_HEADER_VERSION_STRING " libpng version " PNG_LIBPNG_VER_STRING "\n"
 
 /* The versions of shared library builds should stay in sync, going forward */
@@ -285,7 +285,7 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   6
-#define PNG_LIBPNG_VER_RELEASE 57
+#define PNG_LIBPNG_VER_RELEASE 58
 
 /* This should be zero for a public release, or non-zero for a
  * development version.
@@ -316,7 +316,7 @@
  * From version 1.0.1 it is:
  * XXYYZZ, where XX=major, YY=minor, ZZ=release
  */
-#define PNG_LIBPNG_VER 10657 /* 1.6.57 */
+#define PNG_LIBPNG_VER 10658 /* 1.6.58 */
 
 /* Library configuration: these options cannot be changed after
  * the library has been built.
@@ -426,7 +426,7 @@ extern "C" {
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef char *png_libpng_version_1_6_57;
+typedef char *png_libpng_version_1_6_58;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *

3rdparty/png/pngconf.h

@@ -1,6 +1,6 @@
 /* pngconf.h - machine-configurable file for libpng
  *
- * libpng version 1.6.57
+ * libpng version 1.6.58
  *
  * Copyright (c) 2018-2026 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson

3rdparty/png/pnglibconf.h

@@ -1,6 +1,6 @@
 /* pnglibconf.h - library build configuration */
 
-/* libpng version 1.6.57 */
+/* libpng version 1.6.58 */
 
 /* Copyright (c) 2018-2026 Cosmin Truta */
 /* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson */

3rdparty/png/pngrtran.c

@@ -2070,19 +2070,15 @@ png_read_transform_info(png_structrp png_ptr, png_inforp info_ptr)
 {
    png_debug(1, "in png_read_transform_info");
 
-   if (png_ptr->transformations != 0)
+   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+       info_ptr->palette != NULL && png_ptr->palette != NULL)
    {
-      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
-          info_ptr->palette != NULL && png_ptr->palette != NULL)
-      {
-         /* Sync info_ptr->palette with png_ptr->palette.
-          * The function png_init_read_transformations may have modified
-          * png_ptr->palette in place (e.g. for gamma correction or for
-          * background compositing).
-          */
-         memcpy(info_ptr->palette, png_ptr->palette,
-             PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)));
-      }
+      /* Sync info_ptr->palette with png_ptr->palette, which may
+       * have been modified by png_init_read_transformations
+       * (e.g. for gamma correction or background compositing).
+       */
+      memcpy(info_ptr->palette, png_ptr->palette,
+          PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)));
    }
 
 #ifdef PNG_READ_EXPAND_SUPPORTED