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3006 // its background (replacing whatever background it had, which 3007 // would otherwise obscure the art). 3008 if (cellIsBlank(dst.*)) { 3009 dst.* = src; 3010 dst.style.fg = sgrSafe(dimColor(dst.style.fg)); 3011 dst.style.bg = sgrSafe(dimColor(dst.style.bg)); 3012 } else { 3013 const background_maybe = sgrSafe(dimColor(src.style.bg orelse src.style.fg)); 3014 dst.style.bg = background_maybe; 3015 // change the color of text overlaying ANSI art to ensure 3016 // it is readable. don't do this in the web UI, since we 3017 // have direct control of the theme there (also, inner 3018 // scroll panes allow text to move without a re-render 3019 // by the TUI, which would break this). also don't do this 3020 // if the text is explicitly styled. 3021 if (is_terminal and dst.style.fg == null) { 3022 if (background_maybe) |background| { 3023 // use near-black and near-white, which is easier on the eyes 3024 // while retaining high contrast 3025 const luminance = (@as(u32, background.r) * 299 + 3026 @as(u32, background.g) * 587 + 3027 @as(u32, background.b) * 114) / 1000; 3028 dst.style.fg = if (luminance >= 128) 3029 .{ .r = 16, .g = 16, .b = 16 } 3030 else 3031 .{ .r = 240, .g = 240, .b = 240 }; 3032 } 3033 } 3034 } 3035 } 3036 } 3037 } 3038 return out; 3039 } 3040 }; 3041