package com.flightfeather.uav.common.utils
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import java.awt.Image
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import java.awt.image.BufferedImage
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import java.io.ByteArrayInputStream
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import java.io.ByteArrayOutputStream
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import java.util.*
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import javax.imageio.ImageIO
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/**
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* 图片处理工具
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* @date 2024/5/31
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* @author feiyu02
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*/
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object ImageUtil {
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private const val SCHEME_PNG = "data:image/{format};base64,"
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fun prefix(formatName: String): String {
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return SCHEME_PNG.replace("{format}", formatName)
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}
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/**
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* 按照固定宽度压缩图片至base64形式
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* @param bytes 图片二进制流
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* @param w 转换后图片宽度
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* @param formatName 图片格式
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* @param needPrefix 是否添加前缀
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*/
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fun compressImage2(bytes: ByteArray, w: Int, formatName: String = "png", needPrefix: Boolean = true): String {
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val input = ByteArrayInputStream(bytes)
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val srcImg = ImageIO.read(input)
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val srcW = srcImg.width
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val scale = w.toFloat() / srcW
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val h = (srcImg.height * scale).toInt()
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val buffImg = BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB)
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buffImg.graphics.drawImage(srcImg.getScaledInstance(w, h, Image.SCALE_SMOOTH), 0, 0, null)
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val out = ByteArrayOutputStream()
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ImageIO.write(buffImg, formatName, out)
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return if (needPrefix) {
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prefix(formatName) + Base64.getEncoder().encodeToString(out.toByteArray())
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} else {
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Base64.getEncoder().encodeToString(out.toByteArray())
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}
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}
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}
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