Cai1Cai1
a92f8e2c10
- 新增 imglib 包，支持 FilePath/URL/Base64 三种图片输入方式 - 纯白占比检测、白底居中合成、等比缩放、去白边、裁切 - 二维码生成与识别、条形码生成(Code128/EAN13/Code39) - 中文文字图片、书籍信息水印、通用水印叠加 - 输出辅助：EncodeToBytes/EncodeToBase64/SaveToFile/SaveJPEG/SavePNG - 字体缓存，避免重复加载 - 完整测试覆盖（23个测试用例）
64 lines
1.3 KiB
Go
64 lines
1.3 KiB
Go
package imglib
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import (
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"fmt"
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"os"
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"runtime"
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"sync"
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"github.com/golang/freetype/truetype"
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)
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var (
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fontCacheOnce sync.Once
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cachedFont *truetype.Font
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cachedFontErr error
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)
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// GetFont 获取系统默认中文字体（全局缓存，仅首次加载时读取磁盘）
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func GetFont() (*truetype.Font, error) {
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fontCacheOnce.Do(func() {
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path := getDefaultFontPath()
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if path == "" {
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cachedFontErr = fmt.Errorf("未找到系统字体文件")
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return
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}
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data, err := os.ReadFile(path)
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if err != nil {
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cachedFontErr = fmt.Errorf("读取字体文件失败: %v", err)
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return
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}
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cachedFont, cachedFontErr = truetype.Parse(data)
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})
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return cachedFont, cachedFontErr
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}
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func getDefaultFontPath() string {
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switch runtime.GOOS {
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case "windows":
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paths := []string{
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"C:/Windows/Fonts/simhei.ttf",
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"C:/Windows/Fonts/simsun.ttc",
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"C:/Windows/Fonts/msyh.ttc",
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}
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for _, p := range paths {
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if _, err := os.Stat(p); err == nil {
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return p
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}
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}
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case "darwin":
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return "/System/Library/Fonts/PingFang.ttc"
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case "linux":
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paths := []string{
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"/usr/share/fonts/truetype/wqy/wqy-microhei.ttc",
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"/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
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}
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for _, p := range paths {
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if _, err := os.Stat(p); err == nil {
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return p
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}
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}
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}
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return ""
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}
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