deps: add build recipe for PNG

Apparently the macos-14 github runners ship with PNG-1.4, which is too old; the build system notes this, but tries to link the system PNG regardless. This recipe will hopefully inspire the runner to build and use PNG-1.6+ Signed-off-by: Zach Lewis <[email protected]>
AcademySoftwareFoundation · Sep 16, 2024 · d6872e5 · d6872e5
1 parent d0adf3a
commit d6872e5
Showing 1 changed file with 37 additions and 0 deletions.
diff --git a/src/cmake/build_PNG.cmake b/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 ()