bdb1ca9a1e
Make all our package sources use Go 1.17 gofmt format (adding //go:build lines). Not strictly necessary but will avoid spurious changes as files are edited. Part of //go:build change (#41184). See https://golang.org/design/draft-gobuild Change-Id: I30822eb504168b037ed3ec0f7759da1f41251f52 Reviewed-on: https://go-review.googlesource.com/c/mobile/+/294374 Trust: Russ Cox <rsc@golang.org> Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org> Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build linux || darwin
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// +build linux darwin
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package font
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import (
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"bytes"
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"fmt"
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"testing"
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)
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func looksLikeATTF(b []byte) error {
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if len(b) < 256 {
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return fmt.Errorf("not a TTF: not enough data")
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}
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b = b[:256]
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// Look for the 4-byte magic header. See
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// http://www.microsoft.com/typography/otspec/otff.htm
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switch string(b[:4]) {
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case "\x00\x01\x00\x00", "ttcf":
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// No-op.
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default:
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return fmt.Errorf("not a TTF: missing magic header")
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}
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// Look for a glyf table.
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if i := bytes.Index(b, []byte("glyf")); i < 0 {
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return fmt.Errorf(`not a TTF: missing "glyf" table`)
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} else if i%0x10 != 0x0c {
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return fmt.Errorf(`not a TTF: invalid "glyf" offset 0x%02x`, i)
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}
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return nil
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}
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func TestLoadDefault(t *testing.T) {
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def, err := buildDefault()
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if err != nil {
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t.Skip("default font not found")
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}
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if err := looksLikeATTF(def); err != nil {
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t.Errorf("default font: %v", err)
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}
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}
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func TestLoadMonospace(t *testing.T) {
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mono, err := buildMonospace()
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if err != nil {
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t.Skip("mono font not found")
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}
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if err := looksLikeATTF(mono); err != nil {
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t.Errorf("monospace font: %v", err)
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}
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}
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