Avoid unnecessary calls to mark_for_codepoint

gen-wcwidth.py

@@ -206,6 +206,10 @@ def gen_ucd():
         p('default: return 0;')
         p('\t} // }}}')
         p('}\n')
+        if rmap[0xfe0e] != 1275:
+            raise ValueError('The mark for 0xfe0e has changed, you have to update VS15 to {} and VS16 to {} in unicode-data.h'.format(
+                rmap[0xfe0e], rmap[0xfe0f]
+            ))
 
 
 def gen_wcwidth():

kitty/emoji.h

@@ -1,4 +1,4 @@
-// unicode data, built from the unicode standard on: 2018-02-05
+// unicode data, built from the unicode standard on: 2018-02-06
 // see gen-wcwidth.py
 #pragma once
 #include "data-types.h"

kitty/fonts.c

@@ -368,7 +368,7 @@ static inline ssize_t
 fallback_font(Cell *cell) {
     bool bold = (cell->attrs >> BOLD_SHIFT) & 1;
     bool italic = (cell->attrs >> ITALIC_SHIFT) & 1;
-    bool emoji_presentation = (cell->attrs & WIDTH_MASK) == 2 && is_emoji(cell->ch) && cell->cc_idx[0] != mark_for_codepoint(0xfe0e);
+    bool emoji_presentation = (cell->attrs & WIDTH_MASK) == 2 && is_emoji(cell->ch) && cell->cc_idx[0] != VS15;
 
     // Check if one of the existing fallback fonts has this text
     for (size_t i = 0, j = fonts.first_fallback_font_idx; i < fonts.fallback_fonts_count; i++, j++)  {

kitty/screen.c

@@ -316,7 +316,7 @@ draw_combining_char(Screen *self, char_type ch) {
         linebuf_mark_line_dirty(self->linebuf, ypos);
         if (ch == 0xfe0f) {  // emoji presentation variation marker makes default text presentation emoji (narrow emoji) into wide emoji
             Cell *cell = self->linebuf->line->cells + xpos;
-            if ((cell->attrs & WIDTH_MASK) != 2 && cell->cc_idx[0] == mark_for_codepoint(0xfe0f) && is_emoji_presentation_base(cell->ch)) {
+            if ((cell->attrs & WIDTH_MASK) != 2 && cell->cc_idx[0] == VS16 && is_emoji_presentation_base(cell->ch)) {
                 cell->attrs = (cell->attrs & !WIDTH_MASK) | 2;
                 if (xpos == self->columns - 1) move_widened_char(self, cell, xpos, ypos);
                 else self->cursor->x++;

kitty/unicode-data.c

@@ -1,4 +1,4 @@
-// unicode data, built from the unicode standard on: 2018-02-05
+// unicode data, built from the unicode standard on: 2018-02-06
 // see gen-wcwidth.py
 #include "data-types.h"
 

kitty/unicode-data.h

@@ -1,5 +1,7 @@
 #pragma once
 #include "data-types.h"
+#define VS15 1275
+#define VS16 1276
 
 bool is_combining_char(char_type ch);
 bool is_ignored_char(char_type ch);

kitty/wcwidth-std.h

@@ -1,4 +1,4 @@
-// unicode data, built from the unicode standard on: 2018-02-05
+// unicode data, built from the unicode standard on: 2018-02-06
 // see gen-wcwidth.py
 #pragma once
 #include "data-types.h"