Add display components 041-065; move Icon into display; QR via rsc.io/qr

display/internal_test.go

@@ -0,0 +1,90 @@
+package display
+
+import (
+	"image"
+	"image/color"
+	"testing"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+func fill(w, h int, c color.Color) *image.RGBA {
+	img := image.NewRGBA(image.Rect(0, 0, w, h))
+	for y := range h {
+		for x := range w {
+			img.Set(x, y, c)
+		}
+	}
+	return img
+}
+
+func TestReduce(t *testing.T) {
+	pal := pixel.SpringDay
+	a := pal.Colors[pixel.Accent]
+	for _, s := range reduce(fill(8, 8, color.RGBA{a.R, a.G, a.B, 255}), 4, 4, pal) {
+		if s != int8(pixel.Accent) {
+			t.Fatalf("a flat Accent image gave slot %d", s)
+		}
+	}
+	for _, s := range reduce(fill(4, 4, color.RGBA{}), 4, 4, pal) {
+		if s != -1 {
+			t.Fatal("a clear image drew")
+		}
+	}
+	i, b := pal.Colors[pixel.Info], pal.Colors[pixel.Back]
+	mid := color.RGBA{uint8((int(i.R) + int(b.R)) / 2), uint8((int(i.G) + int(b.G)) / 2), uint8((int(i.B) + int(b.B)) / 2), 255}
+	seen := map[int8]int{}
+	for _, s := range reduce(fill(16, 16, mid), 16, 16, pal) {
+		seen[s]++
+	}
+	if len(seen) < 2 {
+		t.Fatalf("a midtone did not dither: %v", seen)
+	}
+}
+
+func TestSpanCoversSource(t *testing.T) {
+	for _, tc := range [][2]int{{96, 48}, {10, 30}, {7, 7}} {
+		size, n := tc[0], tc[1]
+		next := 0
+		for i := range n {
+			a, b := span(0, size, i, n)
+			if a > next || b <= a || b > size+1 {
+				t.Fatalf("span %d of %d over %d is %d..%d after %d", i, n, size, a, b, next)
+			}
+			next = max(next, b)
+		}
+		if next < size {
+			t.Fatalf("spans over %d stop at %d", size, next)
+		}
+	}
+}
+
+func TestAroundWalksTheEdgeOnce(t *testing.T) {
+	w, h := 7, 5
+	seen := map[[2]int]bool{}
+	for d := range 2*(w+h) - 4 {
+		x, y := around(w, h, d)
+		if seen[[2]int{x, y}] || (x != 0 && x != w-1 && y != 0 && y != h-1) {
+			t.Fatalf("step %d at %d,%d", d, x, y)
+		}
+		seen[[2]int{x, y}] = true
+	}
+}
+
+func TestExtremesAndNames(t *testing.T) {
+	if d, l := extremes(pixel.SpringDay); d != pixel.Ink || l != pixel.AccentInk {
+		t.Fatalf("Spring Day extremes %v %v", d, l)
+	}
+	if d, l := extremes(pixel.SpringNight); d == l {
+		t.Fatal("night extremes collapsed")
+	}
+	if len(emoji) != 16 || len(EmojiNames) != 16 {
+		t.Fatal("emoji count")
+	}
+	defer func() {
+		if recover() == nil {
+			t.Fatal("unknown rarity did not panic")
+		}
+	}()
+	Rarity(9).slot()
+}