71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
/*
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4coder_codepoint_map.cpp - Codepoint map to index
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*/
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// TOP
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function b32
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codepoint_index_map_read(Codepoint_Index_Map *map, u32 codepoint, u16 *index_out){
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b32 success = true;
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if (codepoint == 0 && map->has_zero_index){
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*index_out = map->zero_index;
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}
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else if (table_read(&map->table, codepoint, index_out)){
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// NOTE(allen): do nothing
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}
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else{
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success = false;
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}
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return(success);
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}
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function u16
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codepoint_index_map_count(Codepoint_Index_Map *map){
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return(map->max_index + 1);
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}
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function f32
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font_get_glyph_advance(Face_Advance_Map *map, Face_Metrics *metrics, u32 codepoint){
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f32 result = 0.f;
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if (codepoint == '\t'){
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result = metrics->space_advance*4.f;
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}
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else{
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if (character_is_whitespace(codepoint)){
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codepoint = ' ';
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}
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u16 index = 0;
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if (codepoint_index_map_read(&map->codepoint_to_index, codepoint, &index)){
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if (index < map->index_count){
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result = map->advance[index];
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}
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}
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}
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return(result);
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}
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function f32
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font_get_max_glyph_advance_range(Face_Advance_Map *map, Face_Metrics *metrics,
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u32 codepoint_first, u32 codepoint_last){
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f32 result = font_get_glyph_advance(map, metrics, codepoint_first);
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for (u32 i = codepoint_first + 1; i <= codepoint_last; i += 1){
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f32 a = font_get_glyph_advance(map, metrics, i);
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result = Max(a, result);
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}
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return(result);
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}
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function f32
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font_get_average_glyph_advance_range(Face_Advance_Map *map, Face_Metrics *metrics,
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u32 codepoint_first, u32 codepoint_last){
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f32 result = 0.f;
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for (u32 i = codepoint_first; i <= codepoint_last; i += 1){
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result += font_get_glyph_advance(map, metrics, i);
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}
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result /= (f32)(codepoint_last - codepoint_first + 1);
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return(result);
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}
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// BOTTOM
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