306 lines
11 KiB
Go
306 lines
11 KiB
Go
package ui
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import (
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"bytes"
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"context"
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"image"
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"image/color"
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"image/jpeg"
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"image/png"
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"sync/atomic"
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"testing"
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"time"
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"github.com/gdamore/tcell/v2"
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)
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// stripes returns a w×h image whose top half is red and bottom half blue.
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func stripes(w, h int) *image.RGBA {
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img := image.NewRGBA(image.Rect(0, 0, w, h))
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for y := 0; y < h; y++ {
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for x := 0; x < w; x++ {
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c := color.RGBA{255, 0, 0, 255}
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if y >= h/2 {
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c = color.RGBA{0, 0, 255, 255}
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}
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img.SetRGBA(x, y, c)
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}
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}
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return img
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}
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func TestBoxScaleAverages(t *testing.T) {
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src := image.NewRGBA(image.Rect(0, 0, 2, 2))
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src.SetRGBA(0, 0, color.RGBA{200, 0, 0, 255})
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src.SetRGBA(1, 0, color.RGBA{0, 0, 0, 255})
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src.SetRGBA(0, 1, color.RGBA{0, 0, 0, 255})
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src.SetRGBA(1, 1, color.RGBA{0, 0, 0, 255})
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got := boxScale(src, 1, 1).RGBAAt(0, 0)
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if got.R < 49 || got.R > 51 || got.G != 0 || got.A != 255 {
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t.Errorf("average = %+v, want R≈50", got)
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}
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// Upscaling must not leave holes.
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up := boxScale(stripes(1, 2), 3, 4)
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if up.RGBAAt(2, 0).R != 255 || up.RGBAAt(2, 3).B != 255 {
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t.Errorf("upscaled corners: %+v %+v", up.RGBAAt(2, 0), up.RGBAAt(2, 3))
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}
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}
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func TestDecodeCover(t *testing.T) {
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var buf bytes.Buffer
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if err := jpeg.Encode(&buf, stripes(300, 450), nil); err != nil {
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t.Fatal(err)
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}
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img, err := decodeCover(buf.Bytes(), storedCoverHeight)
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if err != nil {
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t.Fatal(err)
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}
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if b := img.Bounds(); b.Dy() != storedCoverHeight || b.Dx() != 106 {
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t.Errorf("stored size %v, want 106x%d", b, storedCoverHeight)
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}
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buf.Reset()
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if err := png.Encode(&buf, stripes(20, 30)); err != nil {
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t.Fatal(err)
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}
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if img, err := decodeCover(buf.Bytes(), storedCoverHeight); err != nil || img.Bounds().Dy() != 30 {
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t.Errorf("small png kept as is: %v %v", img, err)
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}
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if _, err := decodeCover([]byte("<html>not an image</html>"), storedCoverHeight); err == nil {
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t.Error("garbage must be rejected")
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}
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// A header that promises a huge image is refused before decoding it.
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var huge bytes.Buffer
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huge.Write([]byte("\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x27\x10\x00\x00\x27\x10\x08\x02\x00\x00\x00"))
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if _, err := decodeCover(huge.Bytes(), storedCoverHeight); err == nil {
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t.Error("oversized image must be rejected")
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}
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}
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func TestQuadCell(t *testing.T) {
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red, blue, black := color.RGBA{255, 0, 0, 255}, color.RGBA{0, 0, 255, 255}, color.RGBA{0, 0, 0, 255}
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for _, tc := range []struct {
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name string
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px [4]color.RGBA
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wantCh rune
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wantFg color.RGBA
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wantBg color.RGBA
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sameBoth bool
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}{
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{"flat", [4]color.RGBA{red, red, red, red}, ' ', red, red, true},
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{"top half", [4]color.RGBA{red, red, blue, blue}, '▀', red, blue, false},
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{"bottom half", [4]color.RGBA{blue, blue, red, red}, '▀', blue, red, false}, // same picture, canonical form
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{"left half", [4]color.RGBA{red, blue, red, blue}, '▌', red, blue, false},
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{"one corner", [4]color.RGBA{red, blue, blue, blue}, '▘', red, blue, false},
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{"diagonal", [4]color.RGBA{red, black, black, red}, '▞', black, red, false},
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} {
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ch, fg, bg := quadrantStyle.bestCell(tc.px[:])
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if ch != tc.wantCh || fg != tc.wantFg || bg != tc.wantBg {
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t.Errorf("%s: %q fg=%v bg=%v, want %q fg=%v bg=%v", tc.name, ch, fg, bg, tc.wantCh, tc.wantFg, tc.wantBg)
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}
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}
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// Nearly flat noise stays a flat cell instead of a distracting pattern.
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n := color.RGBA{100, 100, 100, 255}
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m := color.RGBA{102, 100, 101, 255}
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if ch, _, _ := quadrantStyle.bestCell([]color.RGBA{n, m, n, n}); ch != ' ' {
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t.Errorf("noise rendered as %q", ch)
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}
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}
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func TestCoverCells(t *testing.T) {
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// A 2:3 poster in a roomy box is limited by the height: 10 rows are 20
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// width units tall, so 13 columns.
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if c, r := coverCells(40, 60, 30, 10, 2); c != 13 || r != 10 {
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t.Errorf("tall limit: %dx%d", c, r)
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}
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// In a narrow box the width limits it, and the box keeps the poster's shape
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// (8×6 cells is exactly 2:3) instead of 10×7 which would leave bars.
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if c, r := coverCells(40, 60, 10, 20, 2); c != 8 || r != 6 {
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t.Errorf("narrow limit: %dx%d", c, r)
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}
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}
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func TestCoverViewDraws(t *testing.T) {
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screen := tcell.NewSimulationScreen("")
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if err := screen.Init(); err != nil {
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t.Fatal(err)
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}
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defer screen.Fini()
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screen.SetSize(30, 10)
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c := newCoverView(quadrantStyle, nil, nil)
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c.setImage(stripes(40, 60)) // red above blue
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c.SetRect(0, 0, 30, 10) // fits 13 columns × 10 rows
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c.Draw(screen)
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rgba := func(c tcell.Color) color.RGBA {
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r, g, b := c.RGB()
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return color.RGBA{uint8(r), uint8(g), uint8(b), 255}
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}
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cell := func(x, y int) (rune, color.RGBA, color.RGBA) {
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ch, _, st, _ := screen.GetContent(x, y)
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fg, bg, _ := st.Decompose()
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return ch, rgba(fg), rgba(bg)
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}
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red, blue := color.RGBA{255, 0, 0, 255}, color.RGBA{0, 0, 255, 255}
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// The poster is 13 columns wide and sits against the right edge (x 17..29).
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if _, fg, bg := cell(17, 0); fg != red || bg != red {
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t.Errorf("top row = fg %v bg %v, want red", fg, bg)
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}
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if _, fg, bg := cell(29, 9); fg != blue || bg != blue {
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t.Errorf("bottom right = fg %v bg %v, want blue", fg, bg)
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}
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// Left of the poster's footprint nothing is drawn.
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if ch, _, _, _ := screen.GetContent(16, 0); ch != ' ' {
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t.Errorf("poster stretched beyond its aspect ratio: %q", ch)
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}
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}
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func TestLoadCoverCachesAndDedupes(t *testing.T) {
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a := newTestApp(t)
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var fetches atomic.Int32
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var buf bytes.Buffer
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png.Encode(&buf, stripes(10, 20))
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ref := coverRef{key: "k", fetch: func(context.Context) ([]byte, error) {
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fetches.Add(1)
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return buf.Bytes(), nil
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}}
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// Run posted callbacks inline instead of through the (not running) event loop.
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delivered := make(chan error, 2)
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a.loadCover(ref, func(_ *image.RGBA, err error) { delivered <- err })
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a.loadCover(ref, func(_ *image.RGBA, err error) { delivered <- err }) // joins the request in flight
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if len(a.coverCache.waiting["k"]) != 2 {
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t.Fatalf("waiters = %d, want 2", len(a.coverCache.waiting["k"]))
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}
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if n := fetches.Load(); n > 1 {
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t.Errorf("fetched %d times", n)
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}
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}
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func TestLoadCoverRemembersFailures(t *testing.T) {
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a := newTestApp(t)
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a.coverCache.failed["bad"] = time.Now()
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var gotErr error
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a.loadCover(coverRef{key: "bad", fetch: func(context.Context) ([]byte, error) {
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t.Error("a recent failure must not be retried")
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return nil, nil
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}}, func(_ *image.RGBA, err error) { gotErr = err })
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if gotErr == nil {
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t.Error("expected an error for a recently failed cover")
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}
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}
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func TestSextantGlyphs(t *testing.T) {
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seen := map[rune]int{}
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for mask := 0; mask < 64; mask++ {
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r := sextantGlyph(mask)
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if prev, dup := seen[r]; dup {
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t.Fatalf("masks %d and %d share the glyph %q", prev, mask, r)
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}
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seen[r] = mask
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if mask > 0 && mask < 63 && mask != 21 && mask != 42 && (r < 0x1FB00 || r > 0x1FB3B) {
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t.Errorf("mask %d: %U outside the sextant block", mask, r)
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}
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}
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for mask, want := range map[int]rune{1: 0x1FB00, 2: 0x1FB01, 20: 0x1FB13, 22: 0x1FB14, 43: 0x1FB28, 62: 0x1FB3B, 21: '▌', 42: '▐', 63: '█', 0: ' '} {
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if got := sextantGlyph(mask); got != want {
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t.Errorf("sextantGlyph(%d) = %U, want %U", mask, got, want)
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}
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}
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}
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func TestSextantCell(t *testing.T) {
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red, blue := color.RGBA{255, 0, 0, 255}, color.RGBA{0, 0, 255, 255}
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// Two rows of red above one row of blue.
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ch, fg, bg := sextantStyle.bestCell([]color.RGBA{red, red, red, red, blue, blue})
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if ch != sextantGlyph(15) || fg != red || bg != blue {
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t.Errorf("got %U fg=%v bg=%v", ch, fg, bg)
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}
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// One row each: red, blue, red.
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ch, fg, bg = sextantStyle.bestCell([]color.RGBA{red, red, blue, blue, red, red})
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if ch != sextantGlyph(0b001100) || fg != blue || bg != red {
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t.Errorf("three bands: %U fg=%v bg=%v", ch, fg, bg)
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}
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}
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func TestCoverStyleForFontCheck(t *testing.T) {
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defer func(old func() bool) { sextantFontAvailable = old }(sextantFontAvailable)
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env := func(m map[string]string) func(string) string { return func(k string) string { return m[k] } }
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sextantFontAvailable = func() bool { return true }
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for _, tc := range []struct {
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name string
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env map[string]string
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want string
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}{
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{"unknown terminal with a suitable font", map[string]string{"TERM": "xterm-256color"}, "sextant"},
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{"over ssh the local fonts are unknown", map[string]string{"TERM": "xterm-256color", "SSH_CONNECTION": "1 2 3 4"}, "quadrant"},
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{"over ssh with a tty", map[string]string{"SSH_TTY": "/dev/pts/1"}, "quadrant"},
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} {
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if got := coverStyleFor("auto", env(tc.env)).name; got != tc.want {
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t.Errorf("%s: %s, want %s", tc.name, got, tc.want)
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}
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}
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// An explicit setting never asks fontconfig.
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sextantFontAvailable = func() bool { t.Error("fontconfig consulted for an explicit style"); return true }
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if coverStyleFor("quadrant", env(nil)).name != "quadrant" || coverStyleFor("sextant", env(nil)).name != "sextant" {
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t.Error("explicit styles must win")
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}
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// No suitable font: quadrants.
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sextantFontAvailable = func() bool { return false }
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if got := coverStyleFor("auto", env(map[string]string{"TERM": "xterm-256color"})).name; got != "quadrant" {
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t.Errorf("no font: %s", got)
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}
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}
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func TestCoverStyleFor(t *testing.T) {
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defer func(old func() bool) { sextantFontAvailable = old }(sextantFontAvailable)
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sextantFontAvailable = func() bool { return false } // the table below is about the terminal checks
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env := func(m map[string]string) func(string) string { return func(k string) string { return m[k] } }
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for _, tc := range []struct {
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setting string
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env map[string]string
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want string
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}{
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{"auto", map[string]string{"TERM": "xterm-kitty"}, "sextant"},
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{"", map[string]string{"TERM_PROGRAM": "WezTerm"}, "sextant"},
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{"auto", map[string]string{"TERM": "foot"}, "sextant"},
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{"auto", map[string]string{"KITTY_WINDOW_ID": "3", "TERM": "screen"}, "sextant"},
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{"auto", map[string]string{"TERM": "xterm-256color"}, "quadrant"},
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{"auto", nil, "quadrant"},
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{"quadrant", map[string]string{"TERM": "xterm-kitty"}, "quadrant"},
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{"sextant", nil, "sextant"},
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} {
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if got := coverStyleFor(tc.setting, env(tc.env)).name; got != tc.want {
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t.Errorf("%q %v = %s, want %s", tc.setting, tc.env, got, tc.want)
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}
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}
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}
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func TestCoverCellsKeepTheShape(t *testing.T) {
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// For many poster shapes, cell shapes and boxes the chosen box must match
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// the poster within the tolerance (or be the closest available).
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for _, img := range [][2]int{{167, 250}, {500, 750}, {2, 3}, {1000, 1500}, {680, 1000}} {
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for _, aspect := range []float64{1.9, 2, 2.1, 2.25} {
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for w := 12; w <= 40; w += 7 {
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for h := 8; h <= 30; h += 11 {
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c, r := coverCells(img[0], img[1], w, h, aspect)
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if c < 1 || r < 1 || c > w || r > h {
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t.Fatalf("%v aspect %v in %dx%d: %dx%d out of bounds", img, aspect, w, h, c, r)
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}
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shape := float64(img[0]) / float64(img[1])
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err := float64(c)/(float64(r)*aspect)/shape - 1
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if err < 0 {
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err = -err
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}
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if err > 0.10 { // the tolerance is 3%; tiny boxes may only get within a cell
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t.Errorf("%v aspect %v in %dx%d: box %dx%d is %.0f%% off", img, aspect, w, h, c, r, err*100)
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}
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}
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}
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}
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}
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}
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