mirror of https://github.com/periph/devices
nrzled: add support for ws281x and clones (#165)
- Includes driver and CLI. Completely untested.pull/1/head
M-A
9 years ago
committed by
GitHub
parent
7dc1026c65
commit
0b05c62a9e
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// Copyright 2017 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 nrzled is a driver for LEDs ws2811/ws2812/ws2812b and compatible
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// devices like sk6812 and ucs1903 that uses a single wire NRZ encoded
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// communication protocol.
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//
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// Note that some ICs are 7 bits with the least significant bit ignored, others
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// are using a real 8 bits PWM. The PWM frequency varies across ICs.
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//
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// Datasheet
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//
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// This directory contains datasheets for ws2812, ws2812b, ucs190x and various
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// sk6812.
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//
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// https://github.com/cpldcpu/light_ws2812/tree/master/Datasheets
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//
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// UCS1903 datasheet
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//
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// http://www.bestlightingbuy.com/pdf/UCS1903%20datasheet.pdf
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package nrzled
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// Copyright 2017 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 nrzled
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import (
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"errors"
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"fmt"
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"image"
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"image/color"
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"time"
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"periph.io/x/periph/conn"
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"periph.io/x/periph/conn/gpio/gpiostream"
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"periph.io/x/periph/devices"
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)
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// NRZ converts a byte into the Non-Return-to-Zero encoded 24 bits.
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//
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// The upper 8 bits are zeros.
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//
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// The Non-return-to-zero protocol is a self-clocking signal that enables
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// one-way communication without the need of a dedicated clock signal, unlike
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// SPI driven LEDs like the apa102.
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//
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// See https://en.wikipedia.org/wiki/Non-return-to-zero for more technical
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// details.
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func NRZ(b byte) uint32 {
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// The stream is 1x01x01x01x01x01x01x01x0 with the x bits being the bits from
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// `b` in reverse order.
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out := uint32(0x924924)
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out |= uint32(b&0x80) << (3*7 + 1 - 7)
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out |= uint32(b&0x40) << (3*6 + 1 - 6)
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out |= uint32(b&0x20) << (3*5 + 1 - 5)
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out |= uint32(b&0x10) << (3*4 + 1 - 4)
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out |= uint32(b&0x08) << (3*3 + 1 - 3)
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out |= uint32(b&0x04) << (3*2 + 1 - 2)
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out |= uint32(b&0x02) << (3*1 + 1 - 1)
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out |= uint32(b&0x01) << (3*0 + 1 - 0)
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return out
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}
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// Dev is a handle to the LED strip.
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type Dev struct {
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p gpiostream.PinOut
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numPixels int
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channels int // Number of channels per pixel
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b gpiostream.BitStream // NRZ encoded bits; cached to reduce heap fragmentation
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buf []byte // Double buffer of RGB/RGBW pixels; enables partial Draw()
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}
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func (d *Dev) String() string {
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return fmt.Sprintf("nrzled{%s}", d.p)
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}
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// Halt turns the lights off.
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//
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// It doesn't affect the back buffer.
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func (d *Dev) Halt() error {
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zero := NRZ(0)
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a := byte(zero >> 16)
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b := byte(zero >> 8)
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c := byte(zero)
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for i := 0; i < d.channels*d.numPixels; i++ {
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d.b.Bits[3*i+0] = a
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d.b.Bits[3*i+1] = b
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d.b.Bits[3*i+2] = c
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}
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if err := d.p.StreamOut(&d.b); err != nil {
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return fmt.Errorf("nrzled: %v", err)
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}
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return nil
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}
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// ColorModel implements devices.Display.
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//
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// It is color.NRGBAModel.
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func (d *Dev) ColorModel() color.Model {
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return color.NRGBAModel
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}
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// Bounds implements devices.Display. Min is guaranteed to be {0, 0}.
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func (d *Dev) Bounds() image.Rectangle {
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return image.Rectangle{Max: image.Point{X: d.numPixels, Y: 1}}
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}
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// Draw implements devices.Display.
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//
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// Using something else than image.NRGBA is 10x slower and is not recommended.
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// When using image.NRGBA, the alpha channel is ignored in RGB mode and used as
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// White channel in RGBW mode.
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//
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// A back buffer is kept so that partial updates are supported, albeit the full
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// LED strip is updated synchronously.
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func (d *Dev) Draw(r image.Rectangle, src image.Image, sp image.Point) {
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r = r.Intersect(d.Bounds())
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srcR := src.Bounds()
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srcR.Min = srcR.Min.Add(sp)
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if dX := r.Dx(); dX < srcR.Dx() {
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srcR.Max.X = srcR.Min.X + dX
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}
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if dY := r.Dy(); dY < srcR.Dy() {
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srcR.Max.Y = srcR.Min.Y + dY
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}
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if d.buf == nil {
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// Allocate d.buf on first Draw() call, in case the user only wants to use
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// .Write().
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d.buf = make([]byte, d.numPixels*d.channels)
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}
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if img, ok := src.(*image.NRGBA); ok {
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// Fast path for image.NRGBA.
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base := srcR.Min.Y * img.Stride
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raster(d.b.Bits, img.Pix[base+4*srcR.Min.X:base+4*srcR.Max.X], d.channels, 4)
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} else {
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// Generic version.
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m := srcR.Max.X - srcR.Min.X
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if d.channels == 3 {
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for i := 0; i < m; i++ {
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c := color.NRGBAModel.Convert(src.At(srcR.Min.X+i, srcR.Min.Y)).(color.NRGBA)
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j := 3 * i
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put(d.b.Bits[3*(j+0):], c.G)
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put(d.b.Bits[3*(j+1):], c.R)
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put(d.b.Bits[3*(j+2):], c.B)
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}
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} else {
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for i := 0; i < m; i++ {
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c := color.NRGBAModel.Convert(src.At(srcR.Min.X+i, srcR.Min.Y)).(color.NRGBA)
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j := 4 * i
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put(d.b.Bits[3*(j+0):], c.G)
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put(d.b.Bits[3*(j+1):], c.R)
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put(d.b.Bits[3*(j+2):], c.B)
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put(d.b.Bits[3*(j+3):], c.A)
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}
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}
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}
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_ = d.p.StreamOut(&d.b)
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}
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// Write accepts a stream of raw RGB/RGBW pixels and sends it as NRZ encoded
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// stream.
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//
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// This bypasses the back buffer.
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func (d *Dev) Write(pixels []byte) (int, error) {
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if len(pixels)%d.channels != 0 || len(pixels) > d.numPixels*d.channels {
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return 0, errors.New("nrzled: invalid RGB stream length")
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}
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raster(d.b.Bits, pixels, d.channels, d.channels)
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if err := d.p.StreamOut(&d.b); err != nil {
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return 0, fmt.Errorf("nrzled: %v", err)
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}
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return len(pixels), nil
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}
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// New opens a handle to a compatible LED strip.
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//
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// The speed (hz) should either be 800000 for fast ICs and 400000 for the slow
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// ones.
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//
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// channels should be either 1 (White only), 3 (RGB) or 4 (RGBW). For RGB and
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// RGBW, the encoding is respectively GRB and GRBW.
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func New(p gpiostream.PinOut, numPixels, hz int, channels int) (*Dev, error) {
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if hz <= 0 || hz > 1000000000 {
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return nil, errors.New("nrzled: specify valid speed in hz")
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}
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if channels != 3 && channels != 4 {
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return nil, errors.New("nrzled: specify valid number of channels (3 or 4)")
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}
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// It is more space effective to use gpiostream.Bits than
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// gpiostream.EdgeStream.
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return &Dev{
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p: p,
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numPixels: numPixels,
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channels: channels,
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b: gpiostream.BitStream{
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Res: time.Second / time.Duration(hz),
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// Each bit is encoded on 3 bits.
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Bits: make(gpiostream.Bits, numPixels*3*channels),
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},
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}, nil
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}
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//
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// raster converts a RGB/RGBW input stream into a binary output stream as it
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// must be sent over the GPIO pin.
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//
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// `in` is RGB 24 bits or RGBW 32 bits. Each bit is encoded over 3 bits so the
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// length of `out` must be 3x as large as `in`.
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//
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// Encoded output format is GRB as 72 bits (24 * 3) or 96 bits (32 * 3).
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func raster(out, in []byte, outChannels, inChannels int) {
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pixels := len(in) / inChannels
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if outChannels == 3 {
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for i := 0; i < pixels; i++ {
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j := i * inChannels
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k := 3 * i
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put(out[3*(k+0):], in[j+1])
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put(out[3*(k+1):], in[j+0])
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put(out[3*(k+2):], in[j+2])
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}
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} else {
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for i := 0; i < pixels; i++ {
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j := i * inChannels
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k := 4 * i
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put(out[3*(k+0):], in[j+1])
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put(out[3*(k+1):], in[j+0])
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put(out[3*(k+2):], in[j+2])
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put(out[3*(k+3):], in[j+3])
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}
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}
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}
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func put(out []byte, v byte) {
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w := NRZ(v)
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out[0] = byte(w >> 16)
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out[1] = byte(w >> 8)
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out[2] = byte(w)
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}
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var _ conn.Resource = &Dev{}
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var _ devices.Display = &Dev{}
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var _ fmt.Stringer = &Dev{}
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@ -0,0 +1,322 @@
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// Copyright 2017 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 nrzled
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import (
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"bytes"
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"image"
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"image/color"
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"strconv"
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"testing"
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"time"
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"periph.io/x/periph/conn/gpio/gpiostream"
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"periph.io/x/periph/conn/gpio/gpiostream/gpiostreamtest"
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)
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func TestNRZ(t *testing.T) {
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data := []struct {
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in byte
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expected uint32
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}{
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{0x00, 0x924924},
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{0x01, 0x924926},
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{0x02, 0x924934},
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{0x04, 0x9249A4},
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{0x08, 0x924D24},
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{0x10, 0x926924},
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{0x20, 0x934924},
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{0x40, 0x9A4924},
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{0x80, 0xD24924},
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{0xFD, 0xDB6DA6},
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{0xFE, 0xDB6DB4},
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{0xFF, 0xDB6DB6},
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}
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for i, line := range data {
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t.Run(strconv.Itoa(i), func(t *testing.T) {
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if actual := NRZ(line.in); line.expected != actual {
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t.Fatalf("NRZ(%X): 0x%X != 0x%X", line.in, line.expected, actual)
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}
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})
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}
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}
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func TestNew_3(t *testing.T) {
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g := gpiostreamtest.PinOutPlayback{
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N: "Yo",
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Ops: []gpiostream.Stream{
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&gpiostream.BitStream{
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Bits: gpiostream.Bits{
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0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92,
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0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49,
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0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24,
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0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92,
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0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49,
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0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24,
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},
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Res: 2500 * time.Nanosecond,
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},
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},
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}
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d, err := New(&g, 10, 400000, 3)
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if err != nil {
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t.Fatal(err)
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}
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if s := d.String(); s != "nrzled{Yo}" {
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t.Fatal(s)
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}
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if c := d.ColorModel(); c != color.NRGBAModel {
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t.Fatal(c)
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}
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if r := d.Bounds(); r != image.Rect(0, 0, 10, 1) {
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t.Fatal(r)
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}
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if err = d.Halt(); err != nil {
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t.Fatal(err)
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}
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if err = g.Close(); err != nil {
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t.Fatal(err)
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}
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}
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func TestNew_fail(t *testing.T) {
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g := gpiostreamtest.PinOutPlayback{}
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if _, err := New(&g, 1, 0, 3); err == nil {
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t.Fatal("hz == 0")
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}
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if _, err := New(&g, 1, 400000, 2); err == nil {
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t.Fatal("channels == 2")
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}
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}
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func TestDraw_NRGBA_3(t *testing.T) {
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g := gpiostreamtest.PinOutPlayback{
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Ops: []gpiostream.Stream{
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&gpiostream.BitStream{
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Bits: gpiostream.Bits{
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0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0xdb,
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||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49,
|
||||||
|
0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24,
|
||||||
|
0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb,
|
||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d,
|
||||||
|
0xb6, 0x92, 0x49, 0xb6, 0x92, 0x49, 0xb4, 0x92, 0x4d, 0x24,
|
||||||
|
},
|
||||||
|
Res: 2500 * time.Nanosecond,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
}
|
||||||
|
d, _ := New(&g, 10, 400000, 3)
|
||||||
|
img := image.NewNRGBA(d.Bounds())
|
||||||
|
copy(img.Pix, getRGBW())
|
||||||
|
d.Draw(d.Bounds(), img, image.Point{})
|
||||||
|
if err := g.Close(); err != nil {
|
||||||
|
t.Fatal(err)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestDraw_RGBA_3(t *testing.T) {
|
||||||
|
g := gpiostreamtest.PinOutPlayback{
|
||||||
|
Ops: []gpiostream.Stream{
|
||||||
|
&gpiostream.BitStream{
|
||||||
|
Bits: gpiostream.Bits{
|
||||||
|
0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0xdb,
|
||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49,
|
||||||
|
0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24,
|
||||||
|
0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb,
|
||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xa6, 0xdb, 0x6d, 0xa6, 0xdb, 0x6d,
|
||||||
|
0xa6, 0xda, 0x49, 0xb6, 0xd3, 0x4d, 0x34, 0xdb, 0x49, 0x36,
|
||||||
|
},
|
||||||
|
Res: 2500 * time.Nanosecond,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
}
|
||||||
|
d, _ := New(&g, 10, 400000, 3)
|
||||||
|
img := image.NewRGBA(d.Bounds())
|
||||||
|
copy(img.Pix, getRGBW())
|
||||||
|
d.Draw(d.Bounds(), img, image.Point{})
|
||||||
|
if err := g.Close(); err != nil {
|
||||||
|
t.Fatal(err)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestDraw_RGBA_4(t *testing.T) {
|
||||||
|
g := gpiostreamtest.PinOutPlayback{
|
||||||
|
Ops: []gpiostream.Stream{
|
||||||
|
&gpiostream.BitStream{
|
||||||
|
Bits: gpiostream.Bits{
|
||||||
|
0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92,
|
||||||
|
0x49, 0x24, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49,
|
||||||
|
0x24, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6,
|
||||||
|
0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb,
|
||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49,
|
||||||
|
0x24, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6,
|
||||||
|
0xdb, 0x6d, 0xa6, 0xdb, 0x6d, 0xa6, 0xdb, 0x6d, 0xa6, 0xd2, 0x49, 0x24, 0xda, 0x49, 0xb6, 0xd3,
|
||||||
|
0x4d, 0x34, 0xdb, 0x49, 0x36, 0x92, 0x4d, 0x26,
|
||||||
|
},
|
||||||
|
Res: 2500 * time.Nanosecond,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
}
|
||||||
|
d, _ := New(&g, 10, 400000, 4)
|
||||||
|
img := image.NewRGBA(d.Bounds())
|
||||||
|
copy(img.Pix, getRGBW())
|
||||||
|
d.Draw(d.Bounds(), img, image.Point{})
|
||||||
|
if err := g.Close(); err != nil {
|
||||||
|
t.Fatal(err)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestDraw_Limits(t *testing.T) {
|
||||||
|
g := gpiostreamtest.PinOutPlayback{
|
||||||
|
Ops: []gpiostream.Stream{
|
||||||
|
&gpiostream.BitStream{
|
||||||
|
Bits: gpiostream.Bits{
|
||||||
|
0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0xdb,
|
||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49,
|
||||||
|
0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24,
|
||||||
|
0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb,
|
||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xa6, 0xdb, 0x6d, 0xa6, 0xdb, 0x6d,
|
||||||
|
0xa6, 0xda, 0x49, 0xb6, 0xd3, 0x4d, 0x34, 0xdb, 0x49, 0x36,
|
||||||
|
},
|
||||||
|
Res: 2500 * time.Nanosecond,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
}
|
||||||
|
d, _ := New(&g, 10, 400000, 3)
|
||||||
|
img := image.NewRGBA(image.Rect(-1, -1, 20, 20))
|
||||||
|
copy(img.Pix, getRGBW())
|
||||||
|
d.Draw(d.Bounds(), img, image.Point{})
|
||||||
|
if err := g.Close(); err != nil {
|
||||||
|
t.Fatal(err)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestWrite_3(t *testing.T) {
|
||||||
|
g := gpiostreamtest.PinOutPlayback{
|
||||||
|
Ops: []gpiostream.Stream{
|
||||||
|
&gpiostream.BitStream{
|
||||||
|
Bits: gpiostream.Bits{
|
||||||
|
0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0xdb,
|
||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49,
|
||||||
|
0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0x92, 0x49, 0x24,
|
||||||
|
0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0x24, 0xdb,
|
||||||
|
0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0xdb, 0x6d, 0xb6, 0x92, 0x49, 0xa4, 0x92, 0x49, 0x36, 0x92, 0x49,
|
||||||
|
0xa6, 0x92, 0x49, 0xb6, 0x92, 0x49, 0xb4, 0x92, 0x4d, 0x24,
|
||||||
|
},
|
||||||
|
Res: 2500 * time.Nanosecond,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
}
|
||||||
|
d, _ := New(&g, 10, 400000, 3)
|
||||||
|
if n, err := d.Write(getRGB()); n != 30 || err != nil {
|
||||||
|
t.Fatal(n, err)
|
||||||
|
}
|
||||||
|
if err := g.Close(); err != nil {
|
||||||
|
t.Fatal(err)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestWrite_fail(t *testing.T) {
|
||||||
|
g := gpiostreamtest.PinOutPlayback{DontPanic: true}
|
||||||
|
d, _ := New(&g, 10, 400000, 3)
|
||||||
|
if n, err := d.Write([]byte{1}); n != 0 || err == nil {
|
||||||
|
t.Fatal(n, err)
|
||||||
|
}
|
||||||
|
if n, err := d.Write([]byte{1, 2, 3}); n != 0 || err == nil {
|
||||||
|
t.Fatal(n, err)
|
||||||
|
}
|
||||||
|
if err := g.Close(); err != nil {
|
||||||
|
t.Fatal(err)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestHalt_fail(t *testing.T) {
|
||||||
|
g := gpiostreamtest.PinOutPlayback{DontPanic: true}
|
||||||
|
d, _ := New(&g, 10, 400000, 3)
|
||||||
|
if d.Halt() == nil {
|
||||||
|
t.Fatal("expected failure")
|
||||||
|
}
|
||||||
|
if err := g.Close(); err != nil {
|
||||||
|
t.Fatal(err)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestRaster_3_3(t *testing.T) {
|
||||||
|
data := []byte{
|
||||||
|
// 24 bits per pixel in RGB
|
||||||
|
0, 1, 2,
|
||||||
|
0xFD, 0xFE, 0xFF,
|
||||||
|
}
|
||||||
|
expected := []byte{
|
||||||
|
// 72 bits per pixel in GRB
|
||||||
|
0x92, 0x49, 0x26, 0x92, 0x49, 0x24, 0x92, 0x49, 0x34,
|
||||||
|
0xdb, 0x6d, 0xb4, 0xdb, 0x6d, 0xa6, 0xdb, 0x6d, 0xb6,
|
||||||
|
}
|
||||||
|
actual := make([]byte, len(expected))
|
||||||
|
raster(actual, data, 3, 3)
|
||||||
|
if !bytes.Equal(expected, actual) {
|
||||||
|
t.Fatalf("\nexpected %#v\n actual %#v", expected, actual)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestRaster_4_4(t *testing.T) {
|
||||||
|
data := []byte{
|
||||||
|
// 32 bits per pixel in RGBW
|
||||||
|
0, 1, 2, 3,
|
||||||
|
0xFC, 0xFD, 0xFE, 0xFF,
|
||||||
|
}
|
||||||
|
expected := []byte{
|
||||||
|
// 96 bits per pixel in GRBW
|
||||||
|
0x92, 0x49, 0x26, 0x92, 0x49, 0x24, 0x92, 0x49, 0x34, 0x92, 0x49, 0x36,
|
||||||
|
0xdb, 0x6d, 0xa6, 0xdb, 0x6d, 0xa4, 0xdb, 0x6d, 0xb4, 0xdb, 0x6d, 0xb6,
|
||||||
|
}
|
||||||
|
actual := make([]byte, len(expected))
|
||||||
|
raster(actual, data, 4, 4)
|
||||||
|
if !bytes.Equal(expected, actual) {
|
||||||
|
t.Fatalf("\nexpected %#v\n actual %#v", expected, actual)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
//
|
||||||
|
|
||||||
|
func BenchmarkNRZ(b *testing.B) {
|
||||||
|
for i := 0; i < b.N; i++ {
|
||||||
|
NRZ(23)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
//
|
||||||
|
|
||||||
|
// getRGB returns a buffer of 10 RGB pixels.
|
||||||
|
func getRGB() []byte {
|
||||||
|
return []byte{
|
||||||
|
0x00, 0x00, 0x00,
|
||||||
|
0x00, 0x00, 0xFF,
|
||||||
|
0x00, 0xFF, 0x00,
|
||||||
|
0x00, 0xFF, 0xFF,
|
||||||
|
0xFF, 0x00, 0x00,
|
||||||
|
0xFF, 0x00, 0xFF,
|
||||||
|
0xFF, 0xFF, 0x00,
|
||||||
|
0xFF, 0xFF, 0xFF,
|
||||||
|
3, 4, 5,
|
||||||
|
6, 7, 8,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// getRGBW returns a buffer of 10 RGB pixels.
|
||||||
|
func getRGBW() []byte {
|
||||||
|
return []byte{
|
||||||
|
0x00, 0x00, 0x00, 0x00,
|
||||||
|
0x00, 0x00, 0xFF, 0xFF,
|
||||||
|
0x00, 0xFF, 0x00, 0xFF,
|
||||||
|
0x00, 0xFF, 0xFF, 0xFF,
|
||||||
|
0xFF, 0x00, 0x00, 0xFF,
|
||||||
|
0xFF, 0x00, 0xFF, 0xFF,
|
||||||
|
0xFF, 0xFF, 0x00, 0xFF,
|
||||||
|
0xFF, 0xFF, 0xFF, 0xFF,
|
||||||
|
0xFF, 0xFF, 0xFF, 0x80,
|
||||||
|
6, 7, 8, 9,
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue