Add: pages, text component

drawer/drawer.go

@@ -55,6 +55,7 @@ func (d *drawer) Clear() {
 	for i := range d.img.Pix {
 		d.img.Pix[i] = 0
 	}
+	d.dev.FlushByMask(0xFF)
 }
 
 func (d *drawer) Flush() {

drawer/font.go

@@ -332,4 +332,23 @@ func (d *drawer) PutText(x0, y0 int, text string) {
 		d.putChar(x, y0, c)
 		x += CharGap + FontCharW
 	}
+
+	// Calculate update mask
+	mask := uint32(0)
+
+	// Implementation dependent !!!
+	// Now for mt12232
+	my0 := min(3, max(0, int((y0)/8)))
+	my1 := min(3, max(0, int((y0+FontCharH-1)/8)))
+
+	mx0 := min(1, max(0, int(x0/61)))
+	mx1 := min(1, max(0, int((x0+FontCharW*len(text)-1)/61)))
+
+	//log.Println(x0, y0, x1, y1)
+	for y := my0; y <= my1; y++ {
+		for x := mx0; x <= mx1; x++ {
+			mask |= (1 << (x*4 + y))
+		}
+	}
+	d.dev.FlushByMask(mask)
 }