!470 [206_2] 修复emoji与普通字符对齐问题

Author: songhahaha66

TeXmacs/tests/tmu/206_2.tmu

@@ -6,6 +6,12 @@
   🫡😇🙃😚🥰😛😐😪
 
   🐔😔☀💞⛔🤦
+
+  Test🐔😔☀💞⛔🤦测试
+
+  <\equation*>
+    <frac|😢|😢+😢>=😭
+  </equation*>
 </body>
 
 <\initial>

devel/206_2.md

@@ -1,4 +1,18 @@
 # [206_2] 初步支持emoji渲染
+
+## 2025/07/31
+### What
+
+将emoji显示竖直方向下调2/10
+
+### How
+
+修改tt_face.cpp和qt_render.cpp
+
+### Why
+
+确保emoji跟普通文字对齐
+
 ## 2025/07/11
 ### 如何测试
 打开 TeXmacs/tests/tmu/206_2.tmu 即可

src/Plugins/Freetype/tt_face.cpp

@@ -141,7 +141,7 @@ tt_font_metric_rep::get (int i) {
       xw= w * PIXEL;               // Logical width in pixels
       xh= h * PIXEL;               // Logical height in pixels
       dx= 0;
-      dy= h * PIXEL;
+      dy= (h * PIXEL * 8) / 10;
     }
 
     SI ww= w * PIXEL;

src/Plugins/Qt/qt_renderer.cpp

@@ -734,8 +734,12 @@ qt_renderer_rep::draw_emoji (int char_code, font_glyphs fn, SI x, SI y) {
     return;
   }
 
+  // Calculate vertical offset for better alignment
+  SI emoji_y_offset=
+      (h * std_shrinkf * 2 * PIXEL) / 10; // Move down by 20% of emoji height
+
   // Draw the emoji picture at the specified position
-  draw_picture (emoji_picture, x, y, 255);
+  draw_picture (emoji_picture, x, y - emoji_y_offset, 255);
 }
 
 /******************************************************************************