[libspng]: New port (#35412)

* [libspng]: New port

* fix usage

* update version

ports/libspng/fix-spngconfig-cmake.patch

@@ -0,0 +1,11 @@
+diff --git a/cmake/Config.cmake.in b/cmake/Config.cmake.in
+index d0123db..5756179 100644
+--- a/cmake/Config.cmake.in
++++ b/cmake/Config.cmake.in
+@@ -1,5 +1,6 @@
+ @PACKAGE_INIT@
+ 
++include(CMakeFindDependencyMacro)
+ find_dependency(ZLIB REQUIRED)
+ 
+ include("${CMAKE_CURRENT_LIST_DIR}/@targets_export_name@.cmake")

ports/libspng/portfile.cmake

@@ -0,0 +1,33 @@
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO randy408/libspng
+    REF "v${VERSION}"
+    SHA512 cd729653599ed97f80d19f3048c1b3bc2ac16f922b3465804b1913bc45d9fc8b28b56bc2121fda36e9d3dcdd12612cced5383313b722a5342b613f8781879f1a
+    HEAD_REF master
+    PATCHES
+        fix-spngconfig-cmake.patch
+)
+
+string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "static" SPNG_BUILD_STATIC)
+string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "dynamic" SPNG_BUILD_SHARED)
+
+vcpkg_cmake_configure(
+    SOURCE_PATH "${SOURCE_PATH}"
+    OPTIONS
+        -DSPNG_STATIC=${SPNG_BUILD_STATIC}
+        -DSPNG_SHARED=${SPNG_BUILD_SHARED}
+        -DBUILD_EXAMPLES=OFF
+)
+
+vcpkg_cmake_install()
+
+vcpkg_cmake_config_fixup(CONFIG_PATH lib/cmake/spng PACKAGE_NAME spng)
+
+file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/include")
+
+vcpkg_copy_pdbs()
+vcpkg_fixup_pkgconfig()
+
+file(INSTALL "${CMAKE_CURRENT_LIST_DIR}/usage" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}")
+
+vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/LICENSE")

ports/libspng/usage

@@ -0,0 +1,4 @@
+libspng provides CMake targets:
+
+    find_package(SPNG CONFIG REQUIRED)
+    target_link_libraries(main PRIVATE $<IF:$<TARGET_EXISTS:spng::spng>,spng::spng,spng::spng_static>) 

ports/libspng/vcpkg.json

@@ -0,0 +1,18 @@
+{
+  "name": "libspng",
+  "version": "0.7.4",
+  "description": "Simple, modern libpng alternative",
+  "homepage": "https://github.com/randy408/libspng",
+  "license": "BSD-2-Clause",
+  "dependencies": [
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    },
+    {
+      "name": "vcpkg-cmake-config",
+      "host": true
+    },
+    "zlib"
+  ]
+}

versions/baseline.json

@@ -4836,6 +4836,10 @@
       "baseline": "0.2.3",
       "port-version": 2
     },
+    "libspng": {
+      "baseline": "0.7.4",
+      "port-version": 0
+    },
     "libsquish": {
       "baseline": "1.15",
       "port-version": 13

versions/l-/libspng.json

@@ -0,0 +1,9 @@
+{
+  "versions": [
+    {
+      "git-tree": "ed674df56d8b39d76443c7db3ae893c08394bf9c",
+      "version": "0.7.4",
+      "port-version": 0
+    }
+  ]
+}