3ba119400e
The bounding box of a string does not necessarily contain the origin. Prior to this commit, BoundString(etc, "x") would call grow exactly once, with the first argument being the (empty) zero rectangle. Change-Id: Id7d4f6c250ac0749f6dae19d11f4e97f9c6f45bc Reviewed-on: https://go-review.googlesource.com/34674 Reviewed-by: Dave Day <djd@golang.org>
66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
// Copyright 2016 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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package font
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import (
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"image"
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"strings"
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"testing"
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"golang.org/x/image/math/fixed"
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)
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const toyAdvance = fixed.Int26_6(10 << 6)
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type toyFace struct{}
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func (toyFace) Close() error {
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return nil
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}
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func (toyFace) Glyph(dot fixed.Point26_6, r rune) (image.Rectangle, image.Image, image.Point, fixed.Int26_6, bool) {
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panic("unimplemented")
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}
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func (toyFace) GlyphBounds(r rune) (fixed.Rectangle26_6, fixed.Int26_6, bool) {
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return fixed.Rectangle26_6{
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Min: fixed.P(2, 0),
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Max: fixed.P(6, 1),
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}, toyAdvance, true
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}
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func (toyFace) GlyphAdvance(r rune) (fixed.Int26_6, bool) {
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return toyAdvance, true
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}
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func (toyFace) Kern(r0, r1 rune) fixed.Int26_6 {
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return 0
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}
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func (toyFace) Metrics() Metrics {
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return Metrics{}
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}
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func TestBound(t *testing.T) {
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wantBounds := []fixed.Rectangle26_6{
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{Min: fixed.P(0, 0), Max: fixed.P(0, 0)},
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{Min: fixed.P(2, 0), Max: fixed.P(6, 1)},
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{Min: fixed.P(2, 0), Max: fixed.P(16, 1)},
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{Min: fixed.P(2, 0), Max: fixed.P(26, 1)},
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}
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for i, wantBound := range wantBounds {
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s := strings.Repeat("x", i)
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gotBound, gotAdvance := BoundString(toyFace{}, s)
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if gotBound != wantBound {
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t.Errorf("i=%d: bound: got %v, want %v", i, gotBound, wantBound)
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}
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wantAdvance := toyAdvance * fixed.Int26_6(i)
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if gotAdvance != wantAdvance {
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t.Errorf("i=%d: advance: got %v, want %v", i, gotAdvance, wantAdvance)
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}
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}
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}
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