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feat: 图片压缩算法调整

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lirtual 2024-12-21 21:32:21 +08:00
parent 485099ebfe
commit effdfd7f73
1 changed files with 116 additions and 12 deletions
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128
scripts/optimize-images.js
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@ -147,37 +147,143 @@ if (!isMainThread) {
const sharpOptions = {
failOnError: false,
limitInputPixels: false,
sequentialRead: !isRamDisk, // 如果不是RAM disk，使用顺序读取
sequentialRead: !isRamDisk,
};
let sharpInstance = sharp(inputPath, sharpOptions);
// 获取图像信息
const metadata = await sharpInstance.metadata();
const isTransparent = metadata.hasAlpha;
const { width, height } = metadata;
const isLargeImage = width > 1000 || height > 1000;
// 智能压缩策略
if (isSmallFile) {
// 小文件使用相对保守的压缩
await sharpInstance
.png({
compressionLevel: 9,
effort: 10,
palette: true,
colors: 128,
dither: 0.4
colors: 256,
quality: 90,
dither: 0.6
})
.toFile(tempPath);
} else if (isTransparent) {
// 包含透明通道的图片
const optimizedPng = sharpInstance.clone()
.png({
quality: 75,
compressionLevel: 9,
effort: 10,
palette: true,
colors: isLargeImage ? 196 : 256,
dither: 0.8
});
// 对于透明图片也尝试使用带Alpha通道的WebP
const webpVersion = sharpInstance.clone()
.webp({
quality: 80,
alphaQuality: 85,
effort: 6,
lossless: false,
nearLossless: false,
smartSubsample: true,
reductionEffort: 6
});
const [pngBuffer, webpBuffer] = await Promise.all([
optimizedPng.toBuffer(),
webpVersion.toBuffer()
]);
// 选择更小的格式
if (webpBuffer.length < pngBuffer.length && webpBuffer.length < inputStats.size) {
await fs.writeFile(tempPath, webpBuffer);
} else {
await fs.writeFile(tempPath, pngBuffer);
}
} else {
await sharpInstance
// 不透明图片，使用更激进的压缩
const optimizedPng = sharpInstance.clone()
.png({
quality: 70,
compressionLevel: 9,
effort: 10,
palette: true,
colors: 128,
dither: 0.4,
effort: 10
})
.toFile(tempPath);
colors: isLargeImage ? 128 : 196,
dither: 0.6
});
// 对于不透明图片尝试多种格式
const webpVersion = sharpInstance.clone()
.webp({
quality: 75,
effort: 6,
lossless: false,
nearLossless: false,
smartSubsample: true,
reductionEffort: 6
});
// 对于照片类型的图片，也尝试JPEG格式
const jpegVersion = isLargeImage ?
sharpInstance.clone()
.jpeg({
quality: 82,
progressive: true,
mozjpeg: true,
chromaSubsampling: '4:2:0'
}) : null;
const bufferPromises = [
optimizedPng.toBuffer(),
webpVersion.toBuffer()
];
if (jpegVersion) {
bufferPromises.push(jpegVersion.toBuffer());
}
const buffers = await Promise.all(bufferPromises);
const [pngBuffer, webpBuffer, jpegBuffer] = buffers;
// 选择最小的格式
let smallestBuffer = pngBuffer;
let smallestSize = pngBuffer.length;
if (webpBuffer.length < smallestSize) {
smallestBuffer = webpBuffer;
smallestSize = webpBuffer.length;
}
if (jpegBuffer && jpegBuffer.length < smallestSize) {
smallestBuffer = jpegBuffer;
smallestSize = jpegBuffer.length;
}
if (smallestSize < inputStats.size) {
await fs.writeFile(tempPath, smallestBuffer);
} else {
// 如果所有格式都没有达到更好的压缩效果，尝试最后的优化
await sharpInstance
.png({
quality: 65,
compressionLevel: 9,
effort: 10,
palette: true,
colors: 128,
dither: 0.5
})
.toFile(tempPath);
}
}
const outputStats = await fs.stat(tempPath);
if (outputStats.size < inputStats.size) {
// 如果优化后的文件更小，则替换原文件
await fs.rename(tempPath, inputPath);
return {
success: true,
@ -186,7 +292,6 @@ if (!isMainThread) {
path: relativePath
};
} else {
// 如果优化后的文件更大，则删除临时文件
await fs.unlink(tempPath);
return {
success: true,
@ -197,7 +302,6 @@ if (!isMainThread) {
};
}
} catch (error) {
// 清理临时文件
try {
await fs.unlink(tempPath);
} catch {}