(inputPath, outputPath, format, options = {})
| 41 | |
| 42 | // 优化单个图片 |
| 43 | async function optimizeImage(inputPath, outputPath, format, options = {}) { |
| 44 | try { |
| 45 | // Check if output already exists and is newer than input |
| 46 | if (fs.existsSync(outputPath)) { |
| 47 | const inputStats = await stat(inputPath); |
| 48 | const outputStats = await stat(outputPath); |
| 49 | if (outputStats.mtime > inputStats.mtime) { |
| 50 | BuildLogger.log(`⏭️ 跳过已优化: ${path.basename(outputPath)}`); |
| 51 | return true; |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | const image = sharp(inputPath); |
| 56 | |
| 57 | // Get image metadata for size validation |
| 58 | const metadata = await image.metadata(); |
| 59 | |
| 60 | // Apply format-specific optimizations |
| 61 | switch (format) { |
| 62 | case 'jpeg': |
| 63 | await image |
| 64 | .jpeg({ |
| 65 | quality: options.quality || config.formats.jpeg.quality, |
| 66 | progressive: true, |
| 67 | mozjpeg: true // Use mozjpeg for better compression |
| 68 | }) |
| 69 | .toFile(outputPath); |
| 70 | break; |
| 71 | case 'png': |
| 72 | await image |
| 73 | .png({ |
| 74 | compressionLevel: 9, |
| 75 | progressive: true, |
| 76 | adaptiveFiltering: true |
| 77 | }) |
| 78 | .toFile(outputPath); |
| 79 | break; |
| 80 | case 'webp': |
| 81 | await image |
| 82 | .webp({ |
| 83 | quality: options.quality || config.formats.webp.quality, |
| 84 | effort: 6, |
| 85 | smartSubsample: true |
| 86 | }) |
| 87 | .toFile(outputPath); |
| 88 | break; |
| 89 | default: |
| 90 | await image.toFile(outputPath); |
| 91 | } |
| 92 | |
| 93 | // Calculate compression savings |
| 94 | const inputSize = (await stat(inputPath)).size; |
| 95 | const outputSize = (await stat(outputPath)).size; |
| 96 | const savings = ((inputSize - outputSize) / inputSize * 100).toFixed(1); |
| 97 | |
| 98 | BuildLogger.success(' 优化完成: ${path.basename(inputPath)} -> ${format.toUpperCase()} (节省 ${savings}%)'); |
| 99 | return { success: true, inputSize, outputSize, savings }; |
| 100 | } catch (error) { |
no test coverage detected