[refactor] 整理注释

fonts/ttf/ttf.cpp

@@ -4,14 +4,12 @@
 #include <memory/heap.h>
 #include <serial.h>
 
-// Per-glyph scratch — kept static to avoid stack pressure for big Chinese glyphs
+// 逐字形临时缓冲区 — 静态分配以避免大中文字形的栈压力
 static ttf_outline_t  s_outline;
 static ttf_seg_t      s_segs[4096];
 static SUINT8         s_coverage[256 * 256];
 
-// Render one glyph bitmap at screen (px, py) where py is the glyph TOP
-// (already converted from baseline).  (px, py) may be negative — caller
-// must have clipped into the visible region.
+// 在屏幕 (px, py) 处渲染单个字形位图，py 为字形顶部（已从基线转换）
 static void blit_glyph(SSINT32 px, SSINT32 py, SUINT32 w, SUINT32 h,
     const SUINT8* coverage, SUINT32 N,
     EFI_GRAPHICS_OUTPUT_BLT_PIXEL color)
@@ -31,7 +29,7 @@ static void blit_glyph(SSINT32 px, SSINT32 py, SUINT32 w, SUINT32 h,
     }
 }
 
-// Render a single codepoint at (x, y) = baseline. Returns advance (26.6).
+// 在基线 (x, y) 处渲染单个码点，返回进宽（26.6 定点数）
 static f26_6 render_codepoint(ttf_face_t* face, SSINT32 cp,
     SSINT32 x, SSINT32 y, SUINT32 pixel_size,
     EFI_GRAPHICS_OUTPUT_BLT_PIXEL color)