Add libpng 1.6.40 (#1005)

modules/libpng/1.6.40/MODULE.bazel

@@ -0,0 +1,8 @@
+module(
+    name = "libpng",
+    version = "1.6.40",
+    compatibility_level = 1,
+)
+
+bazel_dep(name = "platforms", version = "0.0.7")
+bazel_dep(name = "zlib", version = "1.3")

modules/libpng/1.6.40/patches/add_build_file.patch

@@ -0,0 +1,62 @@
+--- BUILD.bazel
++++ BUILD.bazel
+@@ -0,0 +1,59 @@
++# Copied from https://github.com/google-deepmind/lab2d/blob/09474439959534b1de3fce3d4a4ed35d565ea230/bazel/png.BUILD 
++# with minor modifications available under Apache 2.0 License
++# SPDX-License-Identifier: Apache-2.0
++
++# Description:
++#   libpng is the official PNG reference library.
++
++genrule(
++    name = "pnglibconf",
++    srcs = ["scripts/pnglibconf.h.prebuilt"],
++    outs = ["pnglibconf.h"],
++    cmd = "cp $(location scripts/pnglibconf.h.prebuilt) $(location pnglibconf.h)",
++)
++
++cc_library(
++    name = "png",
++    srcs = [
++        "png.c",
++        "pngdebug.h",
++        "pngerror.c",
++        "pngget.c",
++        "pnginfo.h",
++        "pnglibconf.h",
++        "pngmem.c",
++        "pngpread.c",
++        "pngpriv.h",
++        "pngread.c",
++        "pngrio.c",
++        "pngrtran.c",
++        "pngrutil.c",
++        "pngset.c",
++        "pngstruct.h",
++        "pngtrans.c",
++        "pngwio.c",
++        "pngwrite.c",
++        "pngwtran.c",
++        "pngwutil.c",
++    ] + select({
++        "@platforms//cpu:arm64": [
++            "arm/arm_init.c",
++            "arm/filter_neon_intrinsics.c",
++            "arm/palette_neon_intrinsics.c",
++        ],
++        "//conditions:default": [],
++    }),
++    hdrs = [
++        "png.h",
++        "pngconf.h",
++    ],
++    includes = ["."],
++    linkopts = ["-lm"],
++    visibility = ["//visibility:public"],
++    deps = ["@zlib//:zlib"],
++)
++alias(
++    name = "libpng",
++    actual = ":png",
++    visibility = ["//visibility:public"],
++)

modules/libpng/1.6.40/patches/module_dot_bazel.patch

@@ -0,0 +1,11 @@
+--- MODULE.bazel
++++ MODULE.bazel
+@@ -0,0 +1,8 @@
++module(
++    name = "libpng",
++    version = "1.6.40",
++    compatibility_level = 1,
++)
++
++bazel_dep(name = "platforms", version = "0.0.7")
++bazel_dep(name = "zlib", version = "1.3")

modules/libpng/1.6.40/presubmit.yml

@@ -0,0 +1,13 @@
+matrix:
+  platform:
+  - centos7
+  - debian10
+  - ubuntu2004
+  - macos
+  - windows
+tasks:
+  verify_targets:
+    name: Verify build targets
+    platform: ${{ platform }}
+    build_targets:
+    - '@libpng//:libpng'

modules/libpng/1.6.40/source.json

@@ -0,0 +1,10 @@
+{
+    "url": "https://download.sourceforge.net/libpng/libpng-1.6.40.tar.gz",
+    "integrity": "sha256-j3ILNjqghoPJvypWMjb0UxOvLFXVQrVIGuF92NGDu0I=",
+    "strip_prefix": "libpng-1.6.40",
+    "patches": {
+        "add_build_file.patch": "sha256-IKBdDmPuuugv3ZFYMxKbKbJEdKd9c9FPxr5BBjkYnmI=",
+        "module_dot_bazel.patch": "sha256-I4/ZDMvlGjXSTRyHy9dvW8idDHIInWXZ8e6jDW0mq6o="
+    },
+    "patch_strip": 0
+}

modules/libpng/metadata.json

@@ -0,0 +1,15 @@
+{
+    "homepage": "http://www.libpng.org/pub/png/libpng.html",
+    "maintainers": [
+        {
+            "email": "[email protected]",
+            "github": "Vertexwahn",
+            "name": "Julian Amann"
+        }
+    ],
+    "repository": [],
+    "versions": [
+        "1.6.40"
+    ],
+    "yanked_versions": {}
+}