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main.go
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main.go
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/*
* Copyright (c) 2019 Paul Seyfert
* Author: Paul Seyfert <pseyfert.mathphys@gmail.com>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package w3mimgdisplay
import (
"bytes"
"fmt"
"image"
"image/png"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"github.com/google/renameio"
)
func PrintImage(x, y int, img image.Image) error {
if globals.w3m_proc == nil {
render_init()
} else {
render_step()
}
var buf bytes.Buffer
png.Encode(&buf, img)
t, err := renameio.TempFile(globals.tmpdir, globals.file)
if err != nil {
return fmt.Errorf("Cannot create temporary image file: %v", err)
}
defer t.Cleanup()
_, err = t.Write(buf.Bytes())
if err != nil {
return fmt.Errorf("Cannot write to temporary image file: %v", err)
}
err = t.CloseAtomicallyReplace()
if err != nil {
return fmt.Errorf("Cannot finalize to temporary image file: %v", err)
}
b := img.Bounds()
windowWidth := b.Dx()
windowHeight := b.Dy()
// io.WriteString(globals.w3m_pipe, fmt.Sprintf("0;1;%d;%d;%d;%d;;;;;%s\n4;\n3;\n", x, y, windowWidth, windowHeight, globals.file))
io.WriteString(globals.w3m_pipe, fmt.Sprintf("0;1;%d;%d;%d;%d;%d;%d;%d;%d;%s\n4;\n3;\n", x, y, windowWidth, windowHeight, b.Min.X, b.Min.Y, windowWidth, windowHeight, globals.file))
return nil
}
var globals struct {
tmpdir string
file string
id int
w3m_proc *exec.Cmd
w3m_pipe io.WriteCloser
cleanchan chan int
}
func render_init() error {
var err error
globals.w3m_proc = exec.Command("/usr/lib/w3m/w3mimgdisplay")
globals.w3m_pipe, err = globals.w3m_proc.StdinPipe()
if err != nil {
return fmt.Errorf("Cannot open stdin to w3mimgdisplay: %v", err)
}
globals.w3m_proc.Start()
globals.tmpdir, err = ioutil.TempDir("", "go_w3mimgdisplay")
if err != nil {
return fmt.Errorf("Cannot create temporary directory: %v", err)
}
globals.cleanchan = make(chan int, 50) // backlog of no more than 50 undeleted images
render_step()
go concurrent_clean()
return nil
}
func render_step() {
goodToDelete := globals.id
globals.id += 1
globals.file = filepath.Join(globals.tmpdir, fmt.Sprintf("buffer%d.png", globals.id))
globals.cleanchan <- goodToDelete
}
func concurrent_clean() {
for {
rmid, ok := <-globals.cleanchan
if !ok {
break
}
os.Remove(filepath.Join(globals.tmpdir, fmt.Sprintf("buffer%d.png", rmid)))
}
}
func Cleanup() {
close(globals.cleanchan)
globals.w3m_pipe.Close()
globals.w3m_proc.Wait()
os.RemoveAll(globals.tmpdir)
}