fix(domain): natural_size 对 CJK 宽字符按整 em 计宽——修混排文本截字#208
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…ze (#195) The auto-fit text box hugged natural_size's estimate, which priced every char at the Latin 0.6 factor. CJK glyphs rasterize at ~1.0em, so a mixed CJK/Latin line measured narrower than cosmic-text lays it out; the rasterizer wrapped the overflow onto a second line and the single-line-tall box clipped it (on-device: '终验 FINAL CHECK' rendered without 'CHECK'). Per-char advance now prices wide ranges (CJK ideographs, kana, hangul, fullwidth forms) at 1.0em — erring wide is safe: a roomy box renders centered, a tight one truncates.
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真机复现(#195 auto-fit 合入后的终验中发现)
add_texts 内容 "终验 FINAL CHECK"(fontSize 80)→ 渲染只出 "终验 FINAL","CHECK" 丢失。
根因
auto-fit box 紧贴
TextLayout::natural_size的估算宽,而该估算把所有字符按拉丁 0.6 系数计宽;CJK 字形实际 ~1.0em。混排行估算偏窄 → cosmic-text 实际排版超出 box 宽 → 尾部换行到第二行 → 单行高的 box 把第二行裁掉。修复
per-char advance:East Asian Wide/Fullwidth 区段(CJK 表意/假名/谚文/全角标点)按 1.0em,其余保持 0.6。偏宽是安全方向——box 略宽只是留白居中,偏窄则截字。
测试
wide_chars_measure_a_full_em(纯 CJK = n×em;纯拉丁不变)mixed_cjk_latin_line_width_covers_both_scripts(混排宽 > 旧均一估算)真机终验:同一文本重渲后完整显示(见 issue 线程)。
Fixes #195(度量补全)