feat(图像处理): 接入J2KGo，精简规范代码

ofdgo_font_cff.go

@@ -916,70 +916,6 @@ func getCFFIndexData(data []byte, offset int) ([]byte, int) {
 	return data[base : base+off1-1], end - offset
 }
 
-// readCFFIndexItems 读取CFF索引中的所有数据项
-// 入参: data CFF数据, offset 索引偏移
-// 返回: [][]byte 数据项列表
-func readCFFIndexItems(data []byte, offset int) [][]byte {
-	items, _, _ := readType2Index(data, offset)
-	return items
-}
-
-// parseCFFFDSelect 解析CID CFF的FDSelect
-// 入参: data CFF数据, offset FDSelect偏移, numGlyphs 字形数量
-// 返回: []int 字形对应的FD索引
-func parseCFFFDSelect(data []byte, offset int, numGlyphs int) []int {
-	result := make([]int, numGlyphs)
-	if offset <= 0 || offset >= len(data) {
-		return result
-	}
-	format := data[offset]
-	pos := offset + 1
-	switch format {
-	case 0:
-		for i := 0; i < numGlyphs && pos+i < len(data); i++ {
-			result[i] = int(data[pos+i])
-		}
-	case 3:
-		if pos+2 > len(data) {
-			return result
-		}
-		nRanges := int(binary.BigEndian.Uint16(data[pos:]))
-		pos += 2
-		ranges := make([]struct {
-			first int
-			fd    int
-		}, 0, nRanges)
-		for i := 0; i < nRanges && pos+3 <= len(data); i++ {
-			first := int(binary.BigEndian.Uint16(data[pos:]))
-			fd := int(data[pos+2])
-			ranges = append(ranges, struct {
-				first int
-				fd    int
-			}{first: first, fd: fd})
-			pos += 3
-		}
-		if pos+2 > len(data) {
-			return result
-		}
-		sentinel := int(binary.BigEndian.Uint16(data[pos:]))
-		for i, item := range ranges {
-			end := sentinel
-			if i+1 < len(ranges) {
-				end = ranges[i+1].first
-			}
-			if end > numGlyphs {
-				end = numGlyphs
-			}
-			for gid := item.first; gid < end; gid++ {
-				if gid >= 0 && gid < numGlyphs {
-					result[gid] = item.fd
-				}
-			}
-		}
-	}
-	return result
-}
-
 // cffSubrBias 获取Type2子程序偏移
 // 入参: count 子程序数量
 // 返回: int 偏移量