1 files changed, 108 insertions, 0 deletions
diff --git a/cmd/orca/display.go b/cmd/orca/display.go
new file mode 100644
index 0000000..5bd4f87
--- /dev/null
+++ b/cmd/orca/display.go
@@ -0,0 +1,108 @@
+package main
+
+import (
+	"embed"
+	"image"
+	"image/color"
+	"image/draw"
+	_ "image/png"
+	"io"
+	"io/fs"
+	"os"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/opentype"
+	"golang.org/x/image/font/sfnt"
+	"golang.org/x/image/math/fixed"
+)
+
+// openSFNT opens the specified font file
+// It keeps the file open indefinitely for lazy loading when the font is used.
+// It never attempts to close the file and is meant only for loading fonts permanently at init time.
+func openSFNT(fs fs.FS, path string) *sfnt.Font {
+	f, err := fs.Open(path)
+	if err != nil {
+		panic(err)
+	}
+	font, err := sfnt.ParseReaderAt(f.(io.ReaderAt))
+	if err != nil {
+		panic(err)
+	}
+	return font
+}
+
+func openImage(fs fs.FS, path string) image.Image {
+	f, err := fs.Open(path)
+	if err != nil {
+		panic(err)
+	}
+	img, _, err := image.Decode(f)
+	if err != nil {
+		panic(err)
+	}
+	return img
+}
+
+//go:embed *.ttf *.png
+var embedFS embed.FS
+var qtFonts = os.DirFS("/usr/lib/fonts")
+
+var (
+	dejaVuSans       = openSFNT(qtFonts, "DejaVuSans.ttf")
+	notoSans_Regular = openSFNT(embedFS, "NotoSans-Regular.ttf")
+	notoSans_Bold    = openSFNT(embedFS, "NotoSans-Bold.ttf")
+)
+
+var (
+	orcaImg  = openImage(embedFS, "orca.png")
+	belowImg = openImage(embedFS, "below.png")
+)
+
+type justify int
+
+const (
+	_ justify = iota
+	justifyLeft
+	justifyCenter
+	justifyRight
+)
+
+func drawText(img draw.Image, sfnt *sfnt.Font, size float64, just justify, c color.Color, dot fixed.Point26_6, text string) {
+	face, err := opentype.NewFace(sfnt, &opentype.FaceOptions{
+		Size:    size,
+		DPI:     72,
+		Hinting: font.HintingNone,
+	})
+	if err != nil {
+		panic(err)
+	}
+	defer face.Close()
+	drawer := font.Drawer{
+		Dst:  img,
+		Src:  &image.Uniform{c},
+		Face: face,
+		Dot:  dot,
+	}
+	_, adv := drawer.BoundString(text)
+	var offset fixed.Int26_6
+	switch just {
+	case justifyCenter:
+		offset = adv / 2
+	case justifyRight:
+		offset = adv
+	}
+	drawer.Dot.X -= offset
+	drawer.DrawString(text)
+}
+
+func drawDisplay(img draw.Image, s displayState) {
+	draw.Draw(img, img.Bounds(), &image.Uniform{color.RGBA{34, 31, 32, 255}}, image.Point{}, draw.Src)
+	drawText(img, dejaVuSans, 20, justifyLeft, color.White, fixed.P(50, 25), s.now.Format("Jan 02, 2006"))
+	drawText(img, dejaVuSans, 20, justifyRight, color.White, fixed.P(750, 25), s.now.Format("3:04 pm"))
+	drawText(img, notoSans_Regular, 16, justifyCenter, color.White, fixed.P(400, 25), "V1234567-D98765")
+	draw.Draw(img, orcaImg.Bounds().Add(image.Point{400 - orcaImg.Bounds().Dx()/2, 75}), orcaImg, image.Point{}, draw.Over)
+	if s.cvend.ready {
+		drawText(img, notoSans_Bold, 48, justifyCenter, color.White, fixed.P(400, 330), "Tap below")
+		draw.Draw(img, belowImg.Bounds().Add(image.Point{400 - belowImg.Bounds().Dx()/2, 380}), belowImg, image.Point{}, draw.Over)
+	}
+}