deps: Add build recipe for PNG

Signed-off-by: Zach Lewis <zachcanbereached@gmail.com>

THIRD-PARTY.md

@@ -229,6 +229,44 @@ DEALINGS IN THE SOFTWARE.
 
 -------------------------------------------------------------------------
 
+PNG Reference Library License version 2
+SPDX-License-Identifier: libpng-2.0
+
+* libpng https://github.com/pnggroup/libpng
+  Copyright (c) 1995-2024 The PNG Reference Library Authors.
+  Copyright (c) 1995-2024 The PNG Reference Library Authors.
+  Copyright (c) 2018-2024 Cosmin Truta.
+  Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
+  Copyright (c) 1996-1997 Andreas Dilger.
+  Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
+
+The software is supplied "as is", without warranty of any kind,
+express or implied, including, without limitation, the warranties
+of merchantability, fitness for a particular purpose, title, and
+non-infringement.  In no event shall the Copyright owners, or
+anyone distributing the software, be liable for any damages or
+other liability, whether in contract, tort or otherwise, arising
+from, out of, or in connection with the software, or the use or
+other dealings in the software, even if advised of the possibility
+of such damage.
+
+Permission is hereby granted to use, copy, modify, and distribute
+this software, or portions hereof, for any purpose, without fee,
+subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you
+    must not claim that you wrote the original software.  If you
+    use this software in a product, an acknowledgment in the product
+    documentation would be appreciated, but is not required.
+
+ 2. Altered source versions must be plainly marked as such, and must
+    not be misrepresented as being the original software.
+
+ 3. This Copyright notice may not be removed or altered from any
+    source or altered source distribution.
+
+-------------------------------------------------------------------------
+
 Zlib license
 SPDX-License-Identifier: Zlib
 

src/cmake/build_PNG.cmake

@@ -0,0 +1,37 @@
+# Copyright Contributors to the OpenImageIO project.
+# SPDX-License-Identifier: Apache-2.0
+# https://github.com/AcademySoftwareFoundation/OpenImageIO
+
+######################################################################
+# PNG by hand!
+######################################################################
+
+set_cache (PNG_BUILD_VERSION 1.6.43 "PNG version for local builds")
+set (PNG_GIT_REPOSITORY "https://github.com/glennrp/libpng")
+set (PNG_GIT_TAG "v${PNG_BUILD_VERSION}")
+
+set_cache (PNG_BUILD_SHARED_LIBS ${LOCAL_BUILD_SHARED_LIBS_DEFAULT}
+           DOC "Should execute a local PNG build, if necessary, build shared libraries" ADVANCED)
+
+string (MAKE_C_IDENTIFIER ${PNG_BUILD_VERSION} PNG_VERSION_IDENT)
+
+build_dependency_with_cmake(PNG
+    VERSION         ${PNG_BUILD_VERSION}
+    GIT_REPOSITORY  ${PNG_GIT_REPOSITORY}
+    GIT_TAG         ${PNG_GIT_TAG}
+    CMAKE_ARGS
+        -D PNG_SHARED=${PNG_BUILD_SHARED_LIBS}
+        -D PNG_EXECUTABLES=OFF
+        -D PNG_TESTS=OFF
+    )
+
+# Set some things up that we'll need for a subsequent find_package to work
+set (PNG_ROOT ${PNG_LOCAL_INSTALL_DIR})
+
+# Signal to caller that we need to find again at the installed location
+set (PNG_REFIND TRUE)
+set (PNG_REFIND_VERSION ${PNG_BUILD_VERSION})
+
+if (PNG_BUILD_SHARED_LIBS)
+    install_local_dependency_libs (PNG PNG)
+endif ()