mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
359 lines
8.1 KiB
Go
359 lines
8.1 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_test
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import (
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"image"
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"image/color"
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"regexp"
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"strings"
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"testing"
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"github.com/hajimehoshi/bitmapfont/v3"
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"golang.org/x/image/font"
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"golang.org/x/image/math/fixed"
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"github.com/hajimehoshi/ebiten/v2"
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t "github.com/hajimehoshi/ebiten/v2/internal/testing"
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"github.com/hajimehoshi/ebiten/v2/text/v2"
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)
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func TestMain(m *testing.M) {
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t.MainWithRunLoop(m)
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}
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func TestGlyphIndex(t *testing.T) {
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const sampleText = `The quick brown fox jumps
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over the lazy dog.`
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f := text.NewGoXFace(bitmapfont.Face)
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got := sampleText
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for _, g := range text.AppendGlyphs(nil, sampleText, f, nil) {
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got = got[:g.StartIndexInBytes] + strings.Repeat(" ", g.EndIndexInBytes-g.StartIndexInBytes) + got[g.EndIndexInBytes:]
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}
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want := regexp.MustCompile(`\S`).ReplaceAllString(sampleText, " ")
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if got != want {
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t.Errorf("got: %q, want: %q", got, want)
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}
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}
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func TestTextColor(t *testing.T) {
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clr := color.RGBA{R: 0x80, G: 0x80, B: 0x80, A: 0x80}
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img := ebiten.NewImage(30, 30)
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op := &text.DrawOptions{}
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op.GeoM.Translate(0, 0)
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op.ColorScale.ScaleWithColor(clr)
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text.Draw(img, "Hello", text.NewGoXFace(bitmapfont.Face), op)
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w, h := img.Bounds().Dx(), img.Bounds().Dy()
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allTransparent := true
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for j := 0; j < h; j++ {
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for i := 0; i < w; i++ {
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got := img.At(i, j)
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want1 := color.RGBA{R: 0x80, G: 0x80, B: 0x80, A: 0x80}
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want2 := color.RGBA{}
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if got != want1 && got != want2 {
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t.Errorf("img At(%d, %d): got %v; want %v or %v", i, j, got, want1, want2)
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}
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if got == want1 {
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allTransparent = false
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}
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}
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}
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if allTransparent {
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t.Fail()
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}
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}
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const testGoXFaceSize = 6
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type testGoXFace struct{}
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func (f *testGoXFace) Glyph(dot fixed.Point26_6, r rune) (dr image.Rectangle, mask image.Image, maskp image.Point, advance fixed.Int26_6, ok bool) {
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dr = image.Rect(0, 0, testGoXFaceSize, testGoXFaceSize)
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a := image.NewAlpha(dr)
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switch r {
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case 'a':
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for j := dr.Min.Y; j < dr.Max.Y; j++ {
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for i := dr.Min.X; i < dr.Max.X; i++ {
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a.SetAlpha(i, j, color.Alpha{A: 0x80})
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}
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}
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case 'b':
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for j := dr.Min.Y; j < dr.Max.Y; j++ {
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for i := dr.Min.X; i < dr.Max.X; i++ {
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a.SetAlpha(i, j, color.Alpha{A: 0xff})
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}
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}
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}
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mask = a
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advance = fixed.I(testGoXFaceSize)
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ok = true
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return
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}
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func (f *testGoXFace) GlyphBounds(r rune) (bounds fixed.Rectangle26_6, advance fixed.Int26_6, ok bool) {
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bounds = fixed.R(0, 0, testGoXFaceSize, testGoXFaceSize)
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advance = fixed.I(testGoXFaceSize)
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ok = true
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return
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}
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func (f *testGoXFace) GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool) {
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return fixed.I(testGoXFaceSize), true
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}
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func (f *testGoXFace) Kern(r0, r1 rune) fixed.Int26_6 {
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if r1 == 'b' {
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return fixed.I(-testGoXFaceSize)
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}
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return 0
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}
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func (f *testGoXFace) Close() error {
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return nil
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}
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func (f *testGoXFace) Metrics() font.Metrics {
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return font.Metrics{
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Height: fixed.I(testGoXFaceSize),
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Ascent: 0,
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Descent: fixed.I(testGoXFaceSize),
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XHeight: 0,
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CapHeight: fixed.I(testGoXFaceSize),
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CaretSlope: image.Pt(0, 1),
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}
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}
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// Issue #1378
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func TestNegativeKern(t *testing.T) {
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f := text.NewGoXFace(&testGoXFace{})
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dst := ebiten.NewImage(testGoXFaceSize*2, testGoXFaceSize)
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// With testGoXFace, 'b' is rendered at the previous position as 0xff.
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// 'a' is rendered at the current position as 0x80.
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op := &text.DrawOptions{}
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op.GeoM.Translate(0, 0)
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text.Draw(dst, "ab", f, op)
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for j := 0; j < testGoXFaceSize; j++ {
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for i := 0; i < testGoXFaceSize; i++ {
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got := dst.At(i, j)
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want := color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff}
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if got != want {
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t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
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}
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}
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}
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// The glyph 'a' should be treated correctly.
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op = &text.DrawOptions{}
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op.GeoM.Translate(testGoXFaceSize, 0)
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text.Draw(dst, "a", f, op)
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for j := 0; j < testGoXFaceSize; j++ {
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for i := testGoXFaceSize; i < testGoXFaceSize*2; i++ {
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got := dst.At(i, j)
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want := color.RGBA{R: 0x80, G: 0x80, B: 0x80, A: 0x80}
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if got != want {
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t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
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}
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}
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}
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}
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type unhashableGoXFace func()
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const unhashableGoXFaceSize = 10
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func (u *unhashableGoXFace) Glyph(dot fixed.Point26_6, r rune) (dr image.Rectangle, mask image.Image, maskp image.Point, advance fixed.Int26_6, ok bool) {
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dr = image.Rect(0, 0, unhashableGoXFaceSize, unhashableGoXFaceSize)
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a := image.NewAlpha(dr)
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for j := dr.Min.Y; j < dr.Max.Y; j++ {
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for i := dr.Min.X; i < dr.Max.X; i++ {
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a.SetAlpha(i, j, color.Alpha{A: 0xff})
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}
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}
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mask = a
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advance = fixed.I(unhashableGoXFaceSize)
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ok = true
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return
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}
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func (u *unhashableGoXFace) GlyphBounds(r rune) (bounds fixed.Rectangle26_6, advance fixed.Int26_6, ok bool) {
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bounds = fixed.R(0, 0, unhashableGoXFaceSize, unhashableGoXFaceSize)
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advance = fixed.I(unhashableGoXFaceSize)
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ok = true
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return
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}
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func (u *unhashableGoXFace) GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool) {
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return fixed.I(unhashableGoXFaceSize), true
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}
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func (u *unhashableGoXFace) Kern(r0, r1 rune) fixed.Int26_6 {
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return 0
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}
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func (u *unhashableGoXFace) Close() error {
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return nil
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}
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func (u *unhashableGoXFace) Metrics() font.Metrics {
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return font.Metrics{
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Height: fixed.I(unhashableGoXFaceSize),
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Ascent: 0,
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Descent: fixed.I(unhashableGoXFaceSize),
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XHeight: 0,
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CapHeight: fixed.I(unhashableGoXFaceSize),
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CaretSlope: image.Pt(0, 1),
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}
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}
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// Issue #2669
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func TestUnhashableFace(t *testing.T) {
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var face unhashableGoXFace
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f := text.NewGoXFace(&face)
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dst := ebiten.NewImage(unhashableGoXFaceSize*2, unhashableGoXFaceSize*2)
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text.Draw(dst, "a", f, nil)
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for j := 0; j < unhashableGoXFaceSize*2; j++ {
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for i := 0; i < unhashableGoXFaceSize*2; i++ {
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got := dst.At(i, j)
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var want color.RGBA
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if i < unhashableGoXFaceSize && j < unhashableGoXFaceSize {
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want = color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff}
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}
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if got != want {
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t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
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}
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}
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}
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}
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func TestConvertToFixed26_6(t *testing.T) {
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testCases := []struct {
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In float64
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Out fixed.Int26_6
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}{
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{
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In: 0,
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Out: 0,
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},
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{
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In: 0.25,
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Out: fixed.I(1) / 4,
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},
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{
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In: 0.5,
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Out: fixed.I(1) / 2,
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},
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{
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In: 1.25,
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Out: fixed.I(1) * 5 / 4,
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},
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{
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In: 1,
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Out: fixed.I(1),
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},
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{
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In: -0.25,
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Out: fixed.I(-1) / 4,
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},
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{
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In: -0.5,
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Out: fixed.I(-1) / 2,
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},
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{
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In: -1,
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Out: fixed.I(-1),
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},
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{
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In: -1.25,
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Out: fixed.I(-1) * 5 / 4,
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},
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}
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for _, tc := range testCases {
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got := text.Float32ToFixed26_6(float32(tc.In))
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want := tc.Out
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if got != want {
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t.Errorf("Float32ToFixed26_6(%v): got: %v, want: %v", tc.In, got, want)
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}
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got = text.Float64ToFixed26_6(tc.In)
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want = tc.Out
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if got != want {
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t.Errorf("Float32ToFixed26_6(%v): got: %v, want: %v", tc.In, got, want)
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}
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}
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}
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func TestConvertToFloat(t *testing.T) {
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testCases := []struct {
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In fixed.Int26_6
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Out float64
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}{
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{
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In: 0,
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Out: 0,
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},
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{
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In: fixed.I(1) / 4,
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Out: 0.25,
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},
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{
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In: fixed.I(1) / 2,
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Out: 0.5,
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},
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{
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In: fixed.I(1) * 5 / 4,
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Out: 1.25,
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},
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{
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In: fixed.I(1),
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Out: 1,
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},
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{
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In: fixed.I(-1) / 4,
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Out: -0.25,
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},
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{
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In: fixed.I(-1) / 2,
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Out: -0.5,
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},
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{
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In: fixed.I(-1),
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Out: -1,
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},
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{
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In: fixed.I(-1) * 5 / 4,
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Out: -1.25,
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},
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}
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for _, tc := range testCases {
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got := text.Fixed26_6ToFloat32(tc.In)
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want := float32(tc.Out)
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if got != want {
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t.Errorf("Fixed26_6ToFloat32(%v): got: %v, want: %v", tc.In, got, want)
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}
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got64 := text.Fixed26_6ToFloat64(tc.In)
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want64 := tc.Out
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if got64 != want64 {
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t.Errorf("Fixed26_6ToFloat64(%v): got: %v, want: %v", tc.In, got64, want64)
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}
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}
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}
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