92 lines
2.0 KiB
Go
92 lines
2.0 KiB
Go
package pixelflut
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import (
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"bufio"
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"encoding/hex"
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"image"
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"image/color"
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"log"
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"net"
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"sync"
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)
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// Flut asynchronously sends the given image to pixelflut server at `address`
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// using `conns` connections. Pixels are sent column wise, unless `shuffle`
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// is set. Stops when stop is closed.
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// @cleanup: use FlutTask{} as arg
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func Flut(img *image.NRGBA, position image.Point, shuffle bool, address string, conns int, stop chan bool, wg *sync.WaitGroup) {
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cmds := commandsFromImage(img, position)
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if shuffle {
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cmds.Shuffle()
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}
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messages := cmds.Chunk(conns)
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bombWg := sync.WaitGroup{}
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for _, msg := range messages {
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bombWg.Add(1)
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go bombAddress(msg, address, stop, &bombWg)
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}
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bombWg.Wait()
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if wg != nil {
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wg.Done()
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}
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}
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// FetchImage asynchronously uses `conns` to fetch pixels within `bounds` from
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// a pixelflut server at `address`, and writes them into the returned Image.
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func FetchImage(bounds image.Rectangle, address string, conns int, stop chan bool) (img *image.NRGBA) {
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img = image.NewNRGBA(bounds)
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cmds := cmdsFetchImage(bounds).Chunk(conns)
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for i := 0; i < conns; i++ {
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conn, err := net.Dial("tcp", address)
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if err != nil {
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log.Fatal(err)
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}
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go readPixels(img, conn, stop)
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go bombConn(cmds[i], conn, stop)
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}
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return img
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}
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func readPixels(target *image.NRGBA, conn net.Conn, stop chan bool) {
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reader := bufio.NewReader(conn)
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col := make([]byte, 3)
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for {
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select {
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case <-stop:
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return
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default:
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res, err := reader.ReadSlice('\n')
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if err != nil {
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log.Fatal(err)
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}
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// parse response ("PX <x> <y> <col>\n")
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colorStart := len(res) - 7
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xy := res[3 : colorStart-1]
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yStart := 0
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for yStart = len(xy) - 2; yStart >= 0; yStart-- {
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if xy[yStart] == ' ' {
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break
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}
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}
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x := asciiToInt(xy[:yStart])
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y := asciiToInt(xy[yStart+1:])
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hex.Decode(col, res[colorStart:len(res)-1])
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target.SetNRGBA(x, y, color.NRGBA{col[0], col[1], col[2], 255})
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}
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}
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}
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func asciiToInt(buf []byte) (v int) {
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for _, c := range buf {
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v = v*10 + int(c-'0')
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}
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return v
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}
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