1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package font
6
7import (
8	"image"
9	"strings"
10	"testing"
11
12	"golang.org/x/image/math/fixed"
13)
14
15const toyAdvance = fixed.Int26_6(10 << 6)
16
17type toyFace struct{}
18
19func (toyFace) Close() error {
20	return nil
21}
22
23func (toyFace) Glyph(dot fixed.Point26_6, r rune) (image.Rectangle, image.Image, image.Point, fixed.Int26_6, bool) {
24	panic("unimplemented")
25}
26
27func (toyFace) GlyphBounds(r rune) (fixed.Rectangle26_6, fixed.Int26_6, bool) {
28	return fixed.Rectangle26_6{
29		Min: fixed.P(2, 0),
30		Max: fixed.P(6, 1),
31	}, toyAdvance, true
32}
33
34func (toyFace) GlyphAdvance(r rune) (fixed.Int26_6, bool) {
35	return toyAdvance, true
36}
37
38func (toyFace) Kern(r0, r1 rune) fixed.Int26_6 {
39	return 0
40}
41
42func (toyFace) Metrics() Metrics {
43	return Metrics{}
44}
45
46func TestBound(t *testing.T) {
47	wantBounds := []fixed.Rectangle26_6{
48		{Min: fixed.P(0, 0), Max: fixed.P(0, 0)},
49		{Min: fixed.P(2, 0), Max: fixed.P(6, 1)},
50		{Min: fixed.P(2, 0), Max: fixed.P(16, 1)},
51		{Min: fixed.P(2, 0), Max: fixed.P(26, 1)},
52	}
53
54	for i, wantBound := range wantBounds {
55		s := strings.Repeat("x", i)
56		gotBound, gotAdvance := BoundString(toyFace{}, s)
57		if gotBound != wantBound {
58			t.Errorf("i=%d: bound: got %v, want %v", i, gotBound, wantBound)
59		}
60		wantAdvance := toyAdvance * fixed.Int26_6(i)
61		if gotAdvance != wantAdvance {
62			t.Errorf("i=%d: advance: got %v, want %v", i, gotAdvance, wantAdvance)
63		}
64	}
65}
66