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const std = @import("std");
pub fn build(b: *std.Build) !void {
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
const lib = b.addLibrary(.{
.name = "png",
.root_module = b.createModule(.{
.target = target,
.optimize = optimize,
}),
.linkage = .static,
});
lib.linkLibC();
if (target.result.os.tag == .linux) {
lib.linkSystemLibrary("m");
}
if (target.result.os.tag.isDarwin()) {
const apple_sdk = @import("apple_sdk");
try apple_sdk.addPaths(b, lib);
}
// For dynamic linking, we prefer dynamic linking and to search by
// mode first. Mode first will search all paths for a dynamic library
// before falling back to static.
const dynamic_link_opts: std.Build.Module.LinkSystemLibraryOptions = .{
.preferred_link_mode = .dynamic,
.search_strategy = .mode_first,
};
if (b.systemIntegrationOption("zlib", .{})) {
lib.linkSystemLibrary2("zlib", dynamic_link_opts);
} else {
if (b.lazyDependency(
"zlib",
.{ .target = target, .optimize = optimize },
)) |zlib_dep| {
lib.linkLibrary(zlib_dep.artifact("z"));
lib.addIncludePath(b.path(""));
}
if (b.lazyDependency("libpng", .{})) |upstream| {
lib.addIncludePath(upstream.path(""));
}
}
if (b.lazyDependency("libpng", .{})) |upstream| {
var flags: std.ArrayList([]const u8) = .empty;
defer flags.deinit(b.allocator);
try flags.appendSlice(b.allocator, &.{
"-DPNG_ARM_NEON_OPT=0",
"-DPNG_POWERPC_VSX_OPT=0",
"-DPNG_INTEL_SSE_OPT=0",
"-DPNG_MIPS_MSA_OPT=0",
});
lib.addCSourceFiles(.{
.root = upstream.path(""),
.files = srcs,
.flags = flags.items,
});
lib.installHeader(b.path("pnglibconf.h"), "pnglibconf.h");
lib.installHeadersDirectory(
upstream.path(""),
"",
.{ .include_extensions = &.{".h"} },
);
}
b.installArtifact(lib);
}
const srcs: []const []const u8 = &.{
"png.c",
"pngerror.c",
"pngget.c",
"pngmem.c",
"pngpread.c",
"pngread.c",
"pngrio.c",
"pngrtran.c",
"pngrutil.c",
"pngset.c",
"pngtrans.c",
"pngwio.c",
"pngwrite.c",
"pngwtran.c",
"pngwutil.c",
};
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