4coder/custom/4coder_codepoint_map.cpp

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