tiny.filigree.breakLinesInto

1pub fn breakLinesInto(2    allocator: Allocator,3    glyphs: []const ShapedGlyph,4    text: Source,5    wrap_width: f64,6    workspace: *LineBreakWorkspace,7) ![]const u32 {8    workspace.clear();9    errdefer workspace.clear();1011    if (glyphs.len == 0 or wrap_width <= 0) {12        try workspace._line_ends.append(allocator, @intCast(glyphs.len));13        return workspace._line_ends.items;14    }1516    try collectLineBreaksInto(17        allocator,18        text,19        firstGlyphSourceOffset(glyphs),20        &workspace._opportunities,21    );2223    var line_width: f64 = 0;24    var line_start: u32 = 0;25    var last_text_break: u32 = 0;26    var last_cluster_break: u32 = 0;2728    for (glyphs, 0..) |glyph, i| {29        const advance: f64 = @as(f64, @floatFromInt(glyph.x_advance)) / 64.0;30        line_width += advance;3132        if (i + 1 < glyphs.len) {33            const next = glyphs[i + 1];34            const cluster_boundary = next.cluster != glyph.cluster or next.cluster_index != glyph.cluster_index;35            if (cluster_boundary and !next.flags.unsafe_to_break) {36                const break_index: u32 = @intCast(i + 1);37                last_cluster_break = break_index;38                const text_break = lineBreakActionAt(workspace._opportunities.items, next.source_start);39                if (text_break == .mandatory) {40                    try workspace._line_ends.append(allocator, break_index);41                    line_width = 0;42                    line_start = break_index;43                    last_text_break = 0;44                    last_cluster_break = 0;45                    continue;46                }47                if (text_break == .opportunity) {48                    last_text_break = break_index;49                }50            }51        }5253        if (line_width > wrap_width) {54            const selected_break = if (last_text_break > line_start) last_text_break else last_cluster_break;55            if (selected_break <= line_start) continue;56            try workspace._line_ends.append(allocator, selected_break);57            line_start = selected_break;58            line_width = 0;59            var j: u32 = selected_break;60            while (j <= @as(u32, @intCast(i))) : (j += 1) {61                line_width += @as(f64, @floatFromInt(glyphs[j].x_advance)) / 64.0;62            }63            last_text_break = 0;64            last_cluster_break = 0;65        }66    }6768    try workspace._line_ends.append(allocator, @intCast(glyphs.len));69    return workspace._line_ends.items;70}

1pub const breakLinesInto = shape.breakLinesInto;