Add: drawer, status bar, beta mt12864a support

drawer/bar.go

@@ -0,0 +1,69 @@
+package drawer
+
+import "math"
+
+func (d *drawer) FillBar(sx, sy, ex, ey, color int) {
+	d.Lock()
+	defer d.Unlock()
+
+	bounds := d.img.Bounds()
+	// Crop
+	sx = int(math.Max(float64(sx), 0))
+	sy = int(math.Max(float64(sy), 0))
+	ex = int(math.Min(float64(ex), float64(bounds.Dx())))
+	ey = int(math.Min(float64(ey), float64(bounds.Dy())))
+	w := ex - sx
+	// Fill
+	for lineaddr := sy*bounds.Dx() + sx; lineaddr < (ey-1)*bounds.Dx()+ex; lineaddr += bounds.Dx() {
+		addr := lineaddr
+		le := addr + w
+		for ; addr < le; addr++ {
+			d.img.Pix[addr] = 255
+		}
+	}
+}
+
+func (d *drawer) PutBar(sx, sy, ex, ey, color int) {
+	d.Lock()
+	defer d.Unlock()
+
+	bounds := d.img.Bounds()
+	// Crop
+
+	// Top
+	if sy >= 0 && sy < bounds.Dy() {
+		x0 := int(math.Max(float64(sx), 0))
+		x1 := int(math.Min(float64(ex), float64(bounds.Dx())))
+
+		for addr := sy*bounds.Dx() + x0; addr < sy*bounds.Dx()+x1; addr++ {
+			d.img.Pix[addr] = 255
+		}
+	}
+	// Bottom
+	if ey >= 0 && ey <= bounds.Dy() {
+		x0 := int(math.Max(float64(sx), 0))
+		x1 := int(math.Min(float64(ex), float64(bounds.Dx())))
+
+		for addr := (ey-1)*bounds.Dx() + x0; addr < (ey-1)*bounds.Dx()+x1; addr++ {
+			d.img.Pix[addr] = 255
+		}
+	}
+	// Left
+	if sx >= 0 && sx < bounds.Dx() {
+		y0 := int(math.Max(float64(sy), 0))
+		y1 := int(math.Min(float64(ey), float64(bounds.Dy())))
+
+		for addr := y0*bounds.Dx() + sx; addr < y1*bounds.Dx()+sx; addr += bounds.Dx() {
+			d.img.Pix[addr] = 255
+		}
+	}
+	// Right
+	if ex >= 0 && ex <= bounds.Dx() {
+		y0 := int(math.Max(float64(sy), 0))
+		y1 := int(math.Min(float64(ey), float64(bounds.Dy())))
+
+		for addr := y0*bounds.Dx() + (ex - 1); addr < y1*bounds.Dx()+(ex-1); addr += bounds.Dx() {
+			d.img.Pix[addr] = 255
+		}
+	}
+}

drawer/drawer.go

@@ -0,0 +1,76 @@
+package drawer
+
+import (
+	"display-test/display"
+	"image"
+	"sync"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/inconsolata"
+)
+
+type drawer struct {
+	font font.Face
+
+	dev      display.Display
+	img      *image.Gray
+	imgMutex sync.Mutex
+}
+
+type Drawer interface {
+	GetFont() font.Face
+
+	// Lowlevel image
+	GetImg() *image.Gray
+	Lock()
+	Unlock()
+
+	Clear()
+	Flush() error
+
+	PutText(x, y int, text string)
+
+	PutBar(x0, y0, x1, y1, color int)
+	FillBar(x0, y0, x1, y1, color int)
+}
+
+func New(dev display.Display) Drawer {
+	return &drawer{
+		font: inconsolata.Regular8x16,
+
+		dev: dev,
+		img: image.NewGray(dev.GetBounds()),
+	}
+}
+
+func (d *drawer) GetImg() *image.Gray {
+	return d.img
+}
+
+func (d *drawer) GetFont() font.Face {
+	return d.font
+}
+
+func (d *drawer) Lock() {
+	d.imgMutex.Lock()
+}
+
+func (d *drawer) Unlock() {
+	d.imgMutex.Unlock()
+}
+
+func (d *drawer) Clear() {
+	d.Lock()
+	defer d.Unlock()
+
+	for i := range d.img.Pix {
+		d.img.Pix[i] = 0
+	}
+}
+
+func (d *drawer) Flush() error {
+	d.Lock()
+	defer d.Unlock()
+
+	return d.dev.Flush(d.img)
+}

drawer/text.go

@@ -0,0 +1,26 @@
+package drawer
+
+import (
+	"image"
+	"image/color"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func (d *drawer) PutText(x, y int, text string) {
+	d.Lock()
+	defer d.Unlock()
+
+	// Create font drawer
+	col := color.Gray{255}
+	point := fixed.Point26_6{X: fixed.I(x), Y: fixed.I(y)}
+
+	drawer := &font.Drawer{
+		Dst:  d.img,
+		Src:  image.NewUniform(col),
+		Face: d.font,
+		Dot:  point,
+	}
+	drawer.DrawString(text)
+}