// The sx library ships stb_truetype: `#import "vendors/stb_truetype/
// stb_truetype.sx"` resolves through the stdlib search paths and the
// implementation compiles through the object cache. Loads the system
// Helvetica collection and pins INVARIANTS only (font versions vary
// across macOS releases): init succeeds, the pixel-height scale is
// positive, the ascender is positive and the descender negative.
#import "modules/std.sx";
fs :: #import "modules/std/fs.sx";
tt :: #import "vendors/stb_truetype/stb_truetype.sx";

main :: () -> i32 {
    data := fs.read_file("/System/Library/Fonts/Helvetica.ttc");
    if data == null {
        print("font missing\n");
        return 1;
    }
    bytes := data!;

    off := tt.stbtt_GetFontOffsetForIndex(bytes.ptr, 0);
    print("font offset >= 0: {}\n", off >= 0);

    info : *void = xx context.allocator.alloc_bytes(256);
    ok := tt.stbtt_InitFont(info, bytes.ptr, off);
    print("init ok: {}\n", ok != 0);

    px : f32 = 32.0;
    scale := tt.stbtt_ScaleForPixelHeight(info, px);
    print("scale > 0: {}\n", scale > 0.0);

    ascent : i32 = 0;
    descent : i32 = 0;
    linegap : i32 = 0;
    tt.stbtt_GetFontVMetrics(info, @ascent, @descent, @linegap);
    print("ascent > 0, descent < 0: {} {}\n", ascent > 0, descent < 0);
    0
}