44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
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package internal
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import (
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"errors"
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"io"
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"os/exec"
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"strings"
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"time"
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"git.velvettear.de/velvettear/loggo"
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"git.velvettear.de/velvettear/slideshow/internal/config"
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)
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// scale an image
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func ScaleImage(image string) ([]byte, error) {
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timestamp := time.Now().UnixMilli()
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cmd := exec.Command("convert", image, "-resize", config.Resolution+"^", "-gravity", "center", "-extent", config.Resolution, "-")
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stdout, stdoutError := cmd.StdoutPipe()
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stderr, stderrError := cmd.StderrPipe()
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var data []byte
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cmd.Start()
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if stdoutError != nil {
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return data, stdoutError
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}
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if stderrError != nil {
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return data, stdoutError
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}
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data, stdoutError = io.ReadAll(stdout)
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if stdoutError != nil {
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return data, stdoutError
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}
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errorBytes, stderrError := io.ReadAll(stderr)
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if stderrError != nil {
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return data, stdoutError
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}
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cmd.Wait()
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errorMessage := strings.TrimSpace(string(errorBytes))
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if len(errorMessage) > 0 {
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return data, errors.New(errorMessage)
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}
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loggo.DebugTimed("successfully scaled image", timestamp, "image: "+image, "resolution: "+config.Resolution)
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return data, nil
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}
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