tiny.filigree.glyphAtlasAlloc

1pub fn loadAtlasAlloc(2    output_allocator: std.mem.Allocator,3    scratch_allocator: std.mem.Allocator,4    font_bytes: []const u8,5    font_size: i32,6    glyph_ids: []const i32,7    codepoints: []const i32,8    padding: i32,9) Error!Atlas {10    if (font_size <= 0) return error.InvalidPixelSize;11    if (padding < 0 or glyph_ids.len == 0 or glyph_ids.len != codepoints.len) return error.InvalidAtlas;12    const face = face_table.Face.init(font_bytes) catch return error.InvalidFont;13    if ((face.tableSlice("glyf") == null or face.tableSlice("loca") == null) and face.tableSlice("CFF ") == null) return error.UnsupportedOutline;1415    const bitmaps = try scratch_allocator.alloc(GlyphBitmap, glyph_ids.len);16    var bitmap_count: usize = 0;17    errdefer {18        for (bitmaps[0..bitmap_count]) |bitmap| bitmap.deinit(scratch_allocator);19        scratch_allocator.free(bitmaps);20    }21    var glyph_scratch = std.heap.ArenaAllocator.init(scratch_allocator);22    defer glyph_scratch.deinit();23    for (glyph_ids, codepoints) |raw_glyph_id, codepoint| {24        const glyph_id = std.math.cast(u32, raw_glyph_id) orelse return error.GlyphIdTooLarge;25        var bitmap = glyphBitmapAlloc(scratch_allocator, glyph_scratch.allocator(), face, glyph_id, font_size) catch |err| switch (err) {26            error.UnsupportedOutline => blankGlyph(glyph_id, scaleMetric(face.advanceWidth(glyph_id), fontScale(face, font_size))),27            else => return err,28        };29        bitmap.codepoint = codepoint;30        bitmaps[bitmap_count] = bitmap;31        bitmap_count += 1;32        _ = glyph_scratch.reset(.retain_capacity);33    }3435    const atlas = try packAtlasAlloc(output_allocator, bitmaps, font_size, padding);36    for (bitmaps) |bitmap| bitmap.deinit(scratch_allocator);37    scratch_allocator.free(bitmaps);38    return atlas;39}

1pub const glyphAtlasAlloc = font.glyphAtlasAlloc;