mirror of
https://github.com/hajimehoshi/ebiten.git
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114 lines
2.9 KiB
Go
114 lines
2.9 KiB
Go
// Copyright 2023 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package text
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import (
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"github.com/hajimehoshi/ebiten/v2/vector"
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)
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var _ Face = (*LimitedFace)(nil)
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// LimitedFace is a Face with glyph limitations.
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type LimitedFace struct {
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face Face
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unicodeRanges unicodeRanges
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}
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// NewLimitedFace creates a new LimitedFace from the given face.
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// In the default state, glyphs for any runes are limited and not rendered.
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// You have to call AddUnicodeRange to add allowed glyphs.
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func NewLimitedFace(face Face) *LimitedFace {
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return &LimitedFace{
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face: face,
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}
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}
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// AddUnicodeRange adds a rune range for rendered glyphs.
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// A range is inclusive, which means that a range contains the specified rune end.
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func (l *LimitedFace) AddUnicodeRange(start, end rune) {
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l.unicodeRanges.add(start, end)
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}
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// Metrics implements Face.
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func (l *LimitedFace) Metrics() Metrics {
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return l.face.Metrics()
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}
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// advance implements Face.
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func (l *LimitedFace) advance(text string) float64 {
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return l.face.advance(l.unicodeRanges.filter(text))
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}
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// hasGlyph implements Face.
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func (l *LimitedFace) hasGlyph(r rune) bool {
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return l.unicodeRanges.contains(r) && l.face.hasGlyph(r)
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}
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// appendGlyphsForLine implements Face.
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func (l *LimitedFace) appendGlyphsForLine(glyphs []Glyph, line string, indexOffset int, originX, originY float64) []Glyph {
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return l.face.appendGlyphsForLine(glyphs, l.unicodeRanges.filter(line), indexOffset, originX, originY)
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}
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// appendVectorPathForLine implements Face.
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func (l *LimitedFace) appendVectorPathForLine(path *vector.Path, line string, originX, originY float64) {
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l.face.appendVectorPathForLine(path, l.unicodeRanges.filter(line), originX, originY)
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}
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// direction implements Face.
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func (l *LimitedFace) direction() Direction {
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return l.face.direction()
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}
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// private implements Face.
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func (l *LimitedFace) private() {
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}
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type unicodeRange struct {
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start rune
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end rune
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}
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type unicodeRanges struct {
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ranges []unicodeRange
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}
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func (u *unicodeRanges) add(start, end rune) {
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u.ranges = append(u.ranges, unicodeRange{
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start: start,
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end: end,
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})
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}
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func (u *unicodeRanges) contains(r rune) bool {
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for _, rg := range u.ranges {
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if rg.start <= r && r <= rg.end {
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return true
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}
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}
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return false
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}
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func (u *unicodeRanges) filter(str string) string {
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var rs []rune
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for _, r := range str {
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if !u.contains(r) {
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// U+FFFD is "REPLACEMENT CHARACTER".
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r = '\ufffd'
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}
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rs = append(rs, r)
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}
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return string(rs)
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}
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