mirror of
https://github.com/hajimehoshi/ebiten.git
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341 lines
8.3 KiB
Go
341 lines
8.3 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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// This example is a demonstration to render languages that cannot be rendered with the `text` package.
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// We plan to provide a useful API to render them more easily (#2454). Stay tuned!
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package main
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import (
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"bytes"
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_ "embed"
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"image"
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"image/color"
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"image/draw"
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"log"
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"math"
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"github.com/go-text/typesetting/di"
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"github.com/go-text/typesetting/font"
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"github.com/go-text/typesetting/language"
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"github.com/go-text/typesetting/opentype/api"
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"github.com/go-text/typesetting/shaping"
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"golang.org/x/image/math/fixed"
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"golang.org/x/image/vector"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
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)
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//go:embed NotoSansArabic-Regular.ttf
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var arabicTTF []byte
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var arabicOut shaping.Output
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func init() {
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face, err := font.ParseTTF(bytes.NewReader(arabicTTF))
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if err != nil {
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log.Fatal(err)
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}
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runes := []rune("لمّا كان الاعتراف بالكرامة المتأصلة في جميع")
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input := shaping.Input{
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Text: runes,
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RunStart: 0,
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RunEnd: len(runes),
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Direction: di.DirectionRTL,
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Face: face,
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Size: fixed.I(24),
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Script: language.Arabic,
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Language: "ar",
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}
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arabicOut = (&shaping.HarfbuzzShaper{}).Shape(input)
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}
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//go:embed NotoSansDevanagari-Regular.ttf
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var devanagariTTF []byte
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var devanagariOut shaping.Output
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func init() {
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face, err := font.ParseTTF(bytes.NewReader(devanagariTTF))
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if err != nil {
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log.Fatal(err)
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}
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runes := []rune("चूंकि मानव परिवार के सभी सदस्यों के जन्मजात गौरव और समान")
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input := shaping.Input{
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Text: runes,
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RunStart: 0,
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RunEnd: len(runes),
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Direction: di.DirectionLTR,
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Face: face,
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Size: fixed.I(24),
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Script: language.Devanagari,
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Language: "hi",
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}
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devanagariOut = (&shaping.HarfbuzzShaper{}).Shape(input)
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}
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//go:embed NotoSansThai-Regular.ttf
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var thaiTTF []byte
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var thaiOut shaping.Output
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func init() {
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face, err := font.ParseTTF(bytes.NewReader(thaiTTF))
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if err != nil {
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log.Fatal(err)
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}
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runes := []rune("โดยที่การไม่นำพาและการหมิ่นในคุณค่าของสิทธิมนุษยชน")
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input := shaping.Input{
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Text: runes,
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RunStart: 0,
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RunEnd: len(runes),
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Direction: di.DirectionLTR,
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Face: face,
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Size: fixed.I(24),
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Script: language.Thai,
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Language: "th",
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}
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thaiOut = (&shaping.HarfbuzzShaper{}).Shape(input)
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}
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var japaneseOut shaping.Output
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func init() {
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const japanese = language.Script(('j' << 24) | ('p' << 16) | ('a' << 8) | 'n')
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face, err := font.ParseTTF(bytes.NewReader(fonts.MPlus1pRegular_ttf))
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if err != nil {
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log.Fatal(err)
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}
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runes := []rune("ラーメン。")
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input := shaping.Input{
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Text: runes,
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RunStart: 0,
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RunEnd: len(runes),
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Direction: di.DirectionTTB,
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Face: face,
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Size: fixed.I(24),
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Script: japanese,
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Language: "ja",
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}
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japaneseOut = (&shaping.HarfbuzzShaper{}).Shape(input)
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}
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var (
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whiteImage = ebiten.NewImage(3, 3)
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// whiteSubImage is an internal sub image of whiteImage.
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// Use whiteSubImage at DrawTriangles instead of whiteImage in order to avoid bleeding edges.
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whiteSubImage = whiteImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image)
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)
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func init() {
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whiteImage.Fill(color.White)
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}
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const (
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screenWidth = 640
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screenHeight = 480
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)
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type Game struct {
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vertices []ebiten.Vertex
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indices []uint16
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glyphCache map[glyphCacheKey]glyphCacheValue
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}
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type glyphCacheKey struct {
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output *shaping.Output // TODO: This should be a font.Face instead of shaping.Output.
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glyphID api.GID
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origin fixed.Point26_6
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}
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type glyphCacheValue struct {
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image *ebiten.Image
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point image.Point
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}
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func (g *Game) Update() error {
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return nil
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}
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func (g *Game) Draw(screen *ebiten.Image) {
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g.drawGlyphs(screen, &arabicOut, 20, 100)
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g.drawGlyphs(screen, &devanagariOut, 20, 150)
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g.drawGlyphs(screen, &thaiOut, 20, 200)
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g.drawGlyphs(screen, &japaneseOut, 20, 250)
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}
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func fixed26_6ToFloat32(x fixed.Int26_6) float32 {
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return float32(x>>6) + (float32(x&(1<<6-1)) / (1 << 6))
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}
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func float32ToFixed26_6(x float32) fixed.Int26_6 {
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i := float32(math.Floor(float64(x)))
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return (fixed.Int26_6(i) << 6) + fixed.Int26_6((x-i)*(1<<6))
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}
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func (g *Game) drawGlyphs(dst *ebiten.Image, output *shaping.Output, originX, originY float32) {
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g.vertices = g.vertices[:0]
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g.indices = g.indices[:0]
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scale := fixed26_6ToFloat32(output.Size) / float32(output.Face.Font.Upem())
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orig := fixed.Point26_6{
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X: float32ToFixed26_6(originX),
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Y: float32ToFixed26_6(originY),
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}
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for _, glyph := range output.Glyphs {
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key := glyphCacheKey{
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output: output,
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glyphID: glyph.GlyphID,
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origin: orig,
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}
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v, ok := g.glyphCache[key]
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if !ok {
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data := output.Face.GlyphData(glyph.GlyphID).(api.GlyphOutline)
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if len(data.Segments) > 0 {
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segs := make([]api.Segment, len(data.Segments))
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for i, seg := range data.Segments {
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segs[i] = seg
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for j := range seg.Args {
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segs[i].Args[j].X *= scale
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segs[i].Args[j].Y *= scale
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segs[i].Args[j].Y *= -1
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}
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}
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v.image, v.point = segmentsToImage(segs, orig)
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}
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if g.glyphCache == nil {
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g.glyphCache = map[glyphCacheKey]glyphCacheValue{}
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}
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g.glyphCache[key] = v
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}
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if v.image != nil {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(v.point.X), float64(v.point.Y))
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dst.DrawImage(v.image, op)
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}
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orig = orig.Add(fixed.Point26_6{X: glyph.XAdvance, Y: glyph.YAdvance * -1})
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}
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
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return screenWidth, screenHeight
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}
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func main() {
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ebiten.SetWindowSize(screenWidth, screenHeight)
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ebiten.SetWindowTitle("Text I18N (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
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}
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}
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func segmentsToRect(segs []api.Segment) fixed.Rectangle26_6 {
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if len(segs) == 0 {
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return fixed.Rectangle26_6{}
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}
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minX := float32(math.Inf(1))
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minY := float32(math.Inf(1))
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maxX := float32(math.Inf(-1))
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maxY := float32(math.Inf(-1))
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for _, seg := range segs {
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n := 1
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switch seg.Op {
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case api.SegmentOpQuadTo:
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n = 2
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case api.SegmentOpCubeTo:
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n = 3
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}
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for i := 0; i < n; i++ {
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x := seg.Args[i].X
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y := seg.Args[i].Y
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if minX > x {
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minX = x
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}
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if minY > y {
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minY = y
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}
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if maxX < x {
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maxX = x
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}
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if maxY < y {
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maxY = y
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}
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}
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}
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return fixed.Rectangle26_6{
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Min: fixed.Point26_6{
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X: float32ToFixed26_6(minX),
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Y: float32ToFixed26_6(minY),
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},
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Max: fixed.Point26_6{
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X: float32ToFixed26_6(maxX),
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Y: float32ToFixed26_6(maxY),
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},
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}
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}
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func segmentsToImage(segs []api.Segment, orig fixed.Point26_6) (*ebiten.Image, image.Point) {
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dBounds := segmentsToRect(segs).Add(orig)
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dr := image.Rect(
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dBounds.Min.X.Floor(),
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dBounds.Min.Y.Floor(),
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dBounds.Max.X.Ceil(),
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dBounds.Max.Y.Ceil(),
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)
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biasX := fixed26_6ToFloat32(orig.X) - float32(dr.Min.X)
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biasY := fixed26_6ToFloat32(orig.Y) - float32(dr.Min.Y)
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width, height := dr.Dx(), dr.Dy()
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if width <= 0 || height <= 0 {
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return nil, image.Point{}
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}
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rast := vector.NewRasterizer(width, height)
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rast.DrawOp = draw.Src
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for _, seg := range segs {
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switch seg.Op {
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case api.SegmentOpMoveTo:
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rast.MoveTo(seg.Args[0].X+biasX, seg.Args[0].Y+biasY)
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case api.SegmentOpLineTo:
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rast.LineTo(seg.Args[0].X+biasX, seg.Args[0].Y+biasY)
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case api.SegmentOpQuadTo:
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rast.QuadTo(
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seg.Args[0].X+biasX, seg.Args[0].Y+biasY,
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seg.Args[1].X+biasX, seg.Args[1].Y+biasY,
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)
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case api.SegmentOpCubeTo:
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rast.CubeTo(
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seg.Args[0].X+biasX, seg.Args[0].Y+biasY,
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seg.Args[1].X+biasX, seg.Args[1].Y+biasY,
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seg.Args[2].X+biasX, seg.Args[2].Y+biasY,
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)
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}
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}
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dst := image.NewAlpha(image.Rect(0, 0, width, height))
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rast.Draw(dst, dst.Bounds(), image.Opaque, image.Point{})
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return ebiten.NewImageFromImage(dst), dr.Min
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}
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