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122 lines
2.7 KiB
Go
122 lines
2.7 KiB
Go
// Copyright 2021 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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package waveshare2in13v2
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import (
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"encoding/binary"
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"image"
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"image/draw"
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"periph.io/x/devices/v3/ssd1306/image1bit"
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)
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// setMemoryArea configures the target drawing area (horizontal is in bytes,
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// vertical in pixels).
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func setMemoryArea(ctrl controller, area image.Rectangle) {
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startX, endX := uint8(area.Min.X), uint8(area.Max.X-1)
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startY, endY := uint16(area.Min.Y), uint16(area.Max.Y-1)
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startEndY := [4]byte{}
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binary.LittleEndian.PutUint16(startEndY[0:], startY)
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binary.LittleEndian.PutUint16(startEndY[2:], endY)
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ctrl.sendCommand(dataEntryModeSetting)
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ctrl.sendData([]byte{
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// Y increment, X increment; update address counter in X direction
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0b011,
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})
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ctrl.sendCommand(setRAMXAddressStartEndPosition)
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ctrl.sendData([]byte{startX, endX})
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ctrl.sendCommand(setRAMYAddressStartEndPosition)
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ctrl.sendData(startEndY[:4])
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ctrl.sendCommand(setRAMXAddressCounter)
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ctrl.sendData([]byte{startX})
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ctrl.sendCommand(setRAMYAddressCounter)
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ctrl.sendData(startEndY[:2])
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}
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type drawOpts struct {
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commands []byte
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devSize image.Point
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buffer *image1bit.VerticalLSB
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dstRect image.Rectangle
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src image.Image
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srcPts image.Point
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}
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type drawSpec struct {
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// Destination on display in pixels, normalized to fit into actual size.
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DstRect image.Rectangle
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// Area to send to device; horizontally in bytes (thus aligned to
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// 8 pixels), vertically in pixels.
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MemRect image.Rectangle
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}
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func (o *drawOpts) spec() drawSpec {
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s := drawSpec{
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DstRect: image.Rectangle{Max: o.devSize}.Intersect(o.dstRect),
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}
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s.MemRect = image.Rect(
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s.DstRect.Min.X/8, s.DstRect.Min.Y,
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(s.DstRect.Max.X+7)/8, s.DstRect.Max.Y,
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)
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return s
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}
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// sendImage sends an image to the controller after setting up the registers.
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func (o *drawOpts) sendImage(ctrl controller, cmd byte, spec *drawSpec) {
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if spec.MemRect.Empty() {
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return
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}
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setMemoryArea(ctrl, spec.MemRect)
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ctrl.sendCommand(cmd)
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rowData := make([]byte, spec.MemRect.Dx())
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for y := spec.MemRect.Min.Y; y < spec.MemRect.Max.Y; y++ {
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for x := 0; x < len(rowData); x++ {
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rowData[x] = 0
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for bit := 0; bit < 8; bit++ {
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if o.buffer.BitAt(((spec.MemRect.Min.X+x)*8)+bit, y) {
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rowData[x] |= 0x80 >> bit
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}
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}
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}
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ctrl.sendData(rowData)
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}
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}
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func drawImage(ctrl controller, opts *drawOpts) {
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s := opts.spec()
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if s.MemRect.Empty() {
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return
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}
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draw.Src.Draw(opts.buffer, s.DstRect, opts.src, opts.srcPts)
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commands := opts.commands
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if len(commands) == 0 {
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commands = []byte{writeRAMBW, writeRAMRed}
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}
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// Keep the two buffers in sync.
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for _, cmd := range commands {
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opts.sendImage(ctrl, cmd, &s)
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}
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}
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