move stb to src/stb, add stb_image for png decoding

pkg/stb_image_resize/build.zig

@@ -1,65 +0,0 @@
-const std = @import("std");
-
-/// Directories with our includes.
-const root = thisDir();
-pub const include_paths = [_][]const u8{
-    root,
-};
-
-pub fn module(b: *std.Build) *std.build.Module {
-    return b.createModule(.{
-        .source_file = .{ .path = (comptime thisDir()) ++ "/main.zig" },
-    });
-}
-
-fn thisDir() []const u8 {
-    return std.fs.path.dirname(@src().file) orelse ".";
-}
-
-pub const Options = struct {};
-
-pub fn link(
-    b: *std.Build,
-    step: *std.build.LibExeObjStep,
-    opt: Options,
-) !*std.build.LibExeObjStep {
-    const lib = try buildStbImageResize(b, step, opt);
-    step.linkLibrary(lib);
-    inline for (include_paths) |path| step.addIncludePath(.{ .path = path });
-    return lib;
-}
-
-pub fn buildStbImageResize(
-    b: *std.Build,
-    step: *std.build.LibExeObjStep,
-    opt: Options,
-) !*std.build.LibExeObjStep {
-    _ = opt;
-
-    const lib = b.addStaticLibrary(.{
-        .name = "stb_image_resize",
-        .target = step.target,
-        .optimize = step.optimize,
-    });
-
-    // Include
-    inline for (include_paths) |path| lib.addIncludePath(.{ .path = path });
-
-    // Link
-    lib.linkLibC();
-
-    // Compile
-    var flags = std.ArrayList([]const u8).init(b.allocator);
-    defer flags.deinit();
-    try flags.appendSlice(&.{
-        //"-fno-sanitize=undefined",
-    });
-
-    // C files
-    lib.addCSourceFile(.{
-        .file = .{ .path = root ++ "/stb_image_resize.c" },
-        .flags = flags.items,
-    });
-
-    return lib;
-}

pkg/stb_image_resize/main.zig

@@ -1,7 +0,0 @@
-pub usingnamespace @cImport({
-    @cInclude("stb_image_resize.h");
-});
-
-test {
-    // Needed to not crash on test
-}

pkg/stb_image_resize/stb_image_resize.c

@@ -1,2 +0,0 @@
-#define STB_IMAGE_RESIZE_IMPLEMENTATION
-#include <stb_image_resize.h>