4coder/4ed_font_static_functions.cpp

243 lines
7.1 KiB
C++

/*
* Mr. 4th Dimention - Allen Webster
*
* 11.03.2017
*
* Implements some basic getters for fonts set up to make the font type opaque.
*
*/
// TOP
#include "4ed_font_data.h"
internal u32
font_get_id_by_name(System_Functions *system, String name){
u32 id = 0;
u32 count = system->font.get_count();
for (u32 index = 0; index < count; ++index){
char str[256];
u32 str_len = system->font.get_name_by_index(index, str, sizeof(str));
String font_name = make_string(str, str_len);
if (match_ss(font_name, name)){
system->font.get_ids_by_index(index, 1, &id);
break;
}
}
return(id);
}
internal f32
font_get_byte_advance(Render_Font *font){
return(font->byte_advance);
}
internal f32*
font_get_byte_sub_advances(Render_Font *font){
return(font->byte_sub_advances);
}
internal i32
font_get_height(Render_Font *font){
return(font->height);
}
internal i32
font_get_ascent(Render_Font *font){
return(font->ascent);
}
internal i32
font_get_descent(Render_Font *font){
return(font->descent);
}
internal i32
font_get_line_skip(Render_Font *font){
return(font->line_skip);
}
internal i32
font_get_advance(Render_Font *font){
return(font->advance);
}
internal b32
font_can_render(System_Functions *system, Render_Font *font, u32 codepoint){
b32 result = false;
u32 page_number = (codepoint >> 8);
u32 glyph_index = codepoint & 0xFF;
Glyph_Page *page = font_get_or_make_page(system, font, page_number);
if (page != 0 && page->advance[glyph_index] > 0.f){
result = true;
}
return(result);
}
internal f32
font_get_glyph_advance(System_Functions *system, Render_Font *font, u32 codepoint){
f32 result = 0.f;
u32 page_number = (codepoint >> 8);
u32 glyph_index = codepoint & 0xFF;
Glyph_Page *page = 0;
// Hack optimizations
u32 cache_index = page_number % ArrayCount(font->cache);
if (font->cache[cache_index].page_number == page_number){
page = font->cache[cache_index].page;
}
if (page == 0){
page = font_get_or_make_page(system, font, page_number);
font->cache[cache_index].page = page;
font->cache[cache_index].page_number = page_number;
}
if (page != 0 && page->advance[glyph_index] > 0.f){
result = page->advance[glyph_index];
}
return(result);
}
internal Glyph_Data
font_get_glyph(System_Functions *system, Render_Font *font, u32 codepoint){
Glyph_Data result = {0};
u32 page_number = (codepoint >> 8);
u32 glyph_index = codepoint & 0xFF;
Glyph_Page *page = 0;
// Hack optimizations
u32 cache_index = page_number % ArrayCount(font->cache);
if (font->cache[cache_index].page_number == page_number){
page = font->cache[cache_index].page;
}
if (page == 0){
page = font_get_or_make_page(system, font, page_number);
font->cache[cache_index].page = page;
font->cache[cache_index].page_number = page_number;
}
if (page != 0 && page->advance[glyph_index] > 0.f){
result.bounds = page->glyphs[glyph_index];
result.tex = page->tex;
result.tex_width = page->tex_width;
result.tex_height = page->tex_height;
}
return(result);
}
internal Glyph_Page**
font_page_lookup(Render_Font *font, u32 page_number, b32 get_empty_slot){
Glyph_Page **result = 0;
if (font->page_max > 0){
u32 first_index = page_number % font->page_max;
u32 range_count = 0;
u32 ranges[4];
if (first_index == 0){
ranges[0] = 0;
ranges[1] = font->page_max;
range_count = 2;
}
else{
ranges[0] = first_index;
ranges[1] = font->page_max;
ranges[2] = 0;
ranges[3] = first_index;
range_count = 4;
}
Glyph_Page **pages = font->pages;
if (get_empty_slot){
for (u32 j = 0; j < range_count; j += 2){
u32 stop = ranges[j+1];
for (u32 i = ranges[j]; i < stop; ++i){
if (pages[i] == FONT_PAGE_EMPTY || pages[i] == FONT_PAGE_DELETED){
result = &pages[i];
goto break2;
}
if (pages[i]->page_number == page_number){
goto break2;
}
}
}
}
else{
for (u32 j = 0; j < range_count; j += 2){
u32 stop = ranges[j+1];
for (u32 i = ranges[j]; i < stop; ++i){
if (pages[i] == FONT_PAGE_EMPTY){
goto break2;
}
if (pages[i] != FONT_PAGE_DELETED && pages[i]->page_number == page_number){
result = &pages[i];
goto break2;
}
}
}
}
break2:;
}
return(result);
}
internal Glyph_Page*
font_get_or_make_page(System_Functions *system, Render_Font *font, u32 page_number){
Glyph_Page *result = 0;
if (page_number <= 0x10FF){
Glyph_Page **page_get_result = font_page_lookup(font, page_number, false);
if (page_get_result == 0){
b32 has_space = true;
u32 new_page_count = 1;
u32 new_max = (font->page_count+new_page_count)*3;
if (font->page_max < FONT_PAGE_MAX && new_max > font->page_max*2){
Glyph_Page **pages = (Glyph_Page**)system->font.allocate(sizeof(Glyph_Page*)*new_max);
has_space = false;
if (pages != 0){
memset(pages, 0, sizeof(*pages)*new_max);
u32 old_max = font->page_max;
for (u32 i = 0; i < old_max; ++i){
Glyph_Page *this_page = pages[i];
if (this_page != FONT_PAGE_EMPTY && this_page != FONT_PAGE_DELETED){
u32 this_page_number = this_page->page_number;
Glyph_Page **dest = font_page_lookup(font, this_page_number, true);
Assert(dest != 0);
*dest = this_page;
}
}
system->font.free(font->pages);
font->pages = pages;
font->page_max = new_max;
has_space = true;
}
}
if (has_space){
Glyph_Page *new_page = (Glyph_Page*)system->font.allocate(sizeof(Glyph_Page));
if (new_page != 0){
Glyph_Page **dest = font_page_lookup(font, page_number, true);
Assert(dest != 0);
*dest = new_page;
font->page_count += new_page_count;
result = new_page;
system->font.load_page(font, new_page, page_number);
}
}
}
else{
result = *page_get_result;
}
}
return(result);
}
// BOTTOM