优化复合字体轮廓数据结构

app/src/main/java/io/legado/app/model/analyzeRule/QueryTTF.java

@@ -773,12 +773,12 @@ public class QueryTTF {
         var dataTable = directorys.get("glyf");
         assert dataTable != null;
         int glyfCount = maxp.numGlyphs;
-        glyfArray = new GlyfLayout[glyfCount + 1];  // 创建容器时，多创建一个作为保留区
+        glyfArray = new GlyfLayout[glyfCount];  // 创建字形容器
 
         var reader = new BufferReader(buffer, 0);
-        for (int index = 1; index <= glyfCount; index++) {
-            if (loca[index - 1] == loca[index]) continue;   // 当前loca与下一个loca相同，表示这个字形不存在
-            int offset = dataTable.offset + loca[index - 1];
+        for (int index = 0; index < glyfCount; index++) {
+            if (loca[index] == loca[index + 1]) continue;   // 当前loca与下一个loca相同，表示这个字形不存在
+            int offset = dataTable.offset + loca[index];
             // 读GlyphHeaders
             var glyph = new GlyfLayout();
             reader.position(offset);
@@ -893,7 +893,7 @@ public class QueryTTF {
                     if ((glyphTableComponent.flags & 0x20) == 0) break;
                 }
             }
-            glyfArray[index] = glyph;   // 根据文档 glyfId=0 作为保留区使用，这里赋值从索引1开始
+            glyfArray[index] = glyph;
         }
     }
 
@@ -919,7 +919,15 @@ public class QueryTTF {
             // 复合字形
             LinkedList<String> glyphIdList = new LinkedList<>();
             for (var g : glyph.glyphComponent) {
-                glyphIdList.add(String.valueOf(g.glyphIndex));
+                glyphIdList.add("{" +
+                        "flags:" + g.flags + "," +
+                        "glyphIndex:" + g.glyphIndex + "," +
+                        "arg1:" + g.argument1 + "," +
+                        "arg2:" + g.argument2 + "," +
+                        "xScale:" + g.xScale + "," +
+                        "scale01:" + g.scale01 + "," +
+                        "scale10:" + g.scale10 + "," +
+                        "yScale:" + g.yScale + "}");
             }
             glyphString = "[" + String.join(",", glyphIdList) + "]";
         }
@@ -965,10 +973,11 @@ public class QueryTTF {
         int glyfArrayLength = glyfArray.length;
         for (var item : unicodeToGlyphId.entrySet()) {
             int key = item.getKey();
-            int val = item.getValue() + 1;  // glyphArray已根据TTF文档将索引0作为保留位，这里从1开始索引
+            int val = item.getValue();
             if (val >= glyfArrayLength) continue;
             String glyfString = getGlyfById(val);
             unicodeToGlyph.put(key, glyfString);
+            if (glyfString == null) continue;   // null 不能用作hashmap的key
             glyphToUnicode.put(glyfString, key);
         }
 //        Log.i("QueryTTF", "字体处理完成");
@@ -986,8 +995,8 @@ public class QueryTTF {
      */
     public int getGlyfIdByUnicode(int unicode) {
         var result = unicodeToGlyphId.get(unicode);
-        if (result == null) return 0;
-        return result + 1; // 根据TTF文档，轮廓索引的定义从1开始
+        if (result == null) return 0; // 如果找不到Unicode对应的轮廓索引，就返回默认值0
+        return result;
     }
 
     /**
@@ -1008,7 +1017,7 @@ public class QueryTTF {
      */
     public int getUnicodeByGlyf(String glyph) {
         var result = glyphToUnicode.get(glyph);
-        if (result == null) return 0;
+        if (result == null) return 0; // 如果轮廓数据找不到对应的Unicode，就返回默认值0
         return result;
     }