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backgroundPadding?: number; + /** 距离右边距的像素 (默认 10) */ + marginRight?: number; + /** 距离底边距的像素 (默认 10) */ + marginBottom?: number; + /** 输出路径 (默认在原文件名后添加 _watermarked) */ + outputPath?: string; +} + +/** + * 在图片右下角添加文字水印 + * @param inputPath 输入图片路径 + * @param options 水印选项 + */ +export async function addWatermark( + inputPath: string, + options: WatermarkOptions, +): Promise { + const { + text, + fontSize = 24, + color = "black", + backgroundColor, + backgroundPadding = 5, + marginRight = 10, + marginBottom = 10, + } = options; + + let outputPath = options.outputPath; + if (!outputPath) { + const lastDot = inputPath.lastIndexOf("."); + outputPath = lastDot !== -1 + ? `${inputPath.slice(0, lastDot)}_watermarked${inputPath.slice(lastDot)}` + : `${inputPath}_watermarked`; + } + + // 获取原图信息 + const metadata = await sharp(inputPath).metadata(); + const width = metadata.width!; + const height = metadata.height!; + + // 估算文字宽度（使用更精确的系数，根据常见字体调整） + // sans-serif 字体在 SVG 中的平均宽度系数约为 0.5-0.6 + const textWidth = Math.ceil(text.length * fontSize * 0.55); + const textHeight = Math.ceil(fontSize * 0.9); + + // 背景矩形尺寸 + const bgWidth = textWidth + backgroundPadding * 2; + const bgHeight = textHeight + backgroundPadding * 2; + + // 文字和背景位置（右下角对齐） + // text-anchor="end" 意味着文字的右边缘在指定的 x 坐标 + const textX = width - marginRight - 20; + const textY = height - marginBottom; + + // 背景矩形的左上角坐标 + // 背景右边缘与文字右边缘对齐 + const rectX = textX - bgWidth + 20; + const rectY = textY - bgHeight + backgroundPadding + 2; + + // 创建最终 SVG 水印 + const svg = ` + ${backgroundColor ? `` : ""} + ${escapeXml(text)} + `; + + // 将 SVG 水印叠加到原图 + await sharp(inputPath) + .composite([ + { + input: Buffer.from(svg), + top: 0, + left: 0, + }, + ]) + .toFile(outputPath); + + console.log(`Added watermark: ${outputPath}`); +} + +/** + * 转义 XML 特殊字符 + */ +function escapeXml(str: string): string { + return str + .replace(/&/g, "&") + .replace(//g, ">") + .replace(/"/g, """) + .replace(/'/g, "'"); +} + +if (import.meta.main) { + const flags = parseArgs(Deno.args, { + boolean: ["help"], + string: ["watermark"], + }); + + const watermarkText = flags.watermark; + const imagePaths = flags._; + + if (!watermarkText || imagePaths.length == 0) { + console.log("Usage: deno run -A main.ts --watermark 'watermark' "); + console.log("Example: deno run -A main.ts --watermark '© 2026 MyName' image.jpg"); + Deno.exit(1); + } + + for (const imagePath of imagePaths) { + await addWatermark(imagePath+'', { + fontSize: 32, + text: watermarkText, + color: 'black', + backgroundPadding: 2, + backgroundColor: 'white' + }); + } +} diff --git a/image-watermark/main_test.ts b/image-watermark/main_test.ts new file mode 100644 index 0000000..6b7bcca --- /dev/null +++ b/image-watermark/main_test.ts @@ -0,0 +1,49 @@ +import { assertEquals } from "@std/assert"; +import { addWatermark } from "./main.ts"; + +Deno.test("addWatermark - should add watermark to image", async () => { + const { default: sharp } = await import("sharp"); + + // 创建测试图片 (200x200 红色方块) + const testImagePath = "/tmp/test_image.png"; + await sharp({ + create: { + width: 200, + height: 200, + channels: 3, + background: { r: 255, g: 0, b: 0 }, + }, + }).png().toFile(testImagePath); + + const outputPath = "/tmp/test_image_watermarked.png"; + + try { + // 添加水印（带背景色） + await addWatermark(testImagePath, { + text: "Test Watermark", + fontSize: 16, + color: "white", + backgroundColor: "#80000000", + backgroundPadding: 5, + marginRight: 10, + marginBottom: 10, + outputPath, + }); + + // 验证输出文件存在 + const stat = await Deno.stat(outputPath); + assertEquals(stat.isFile, true); + } finally { + // 清理 + try { + await Deno.remove(testImagePath); + } catch { + // Ignore + } + try { + await Deno.remove(outputPath); + } catch { + // Ignore + } + } +});