448 lines
14 KiB
C++
448 lines
14 KiB
C++
|
/*
|
||
|
* Mr. 4th Dimention - Allen Webster
|
||
|
*
|
||
|
* 18.07.2017
|
||
|
*
|
||
|
* Freetype implementation of the font provider interface.
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
// TOP
|
||
|
|
||
|
// NOTE(allen): Thanks to insofaras. This is copy-pasted from some work he originally did to get free type working on Linux.
|
||
|
|
||
|
#undef internal
|
||
|
#include <ft2build.h>
|
||
|
#include FT_FREETYPE_H
|
||
|
#define internal static
|
||
|
|
||
|
internal u32
|
||
|
font_ft_flags(b32 use_hinting){
|
||
|
u32 ft_flags = FT_LOAD_RENDER;
|
||
|
|
||
|
if (use_hinting){
|
||
|
// NOTE(inso): FT_LOAD_TARGET_LIGHT does hinting only vertically, which looks nicer imo
|
||
|
// maybe it could be exposed as an option for hinting, instead of just on/off.
|
||
|
ft_flags |= FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_LIGHT;
|
||
|
}
|
||
|
else{
|
||
|
ft_flags |= (FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
|
||
|
}
|
||
|
|
||
|
return(ft_flags);
|
||
|
}
|
||
|
|
||
|
internal void
|
||
|
font_load_page_layout(Font_Settings *settings, Font_Metrics *metrics, Glyph_Page *page, u32 page_number){
|
||
|
Assert(page != 0);
|
||
|
memset(page, 0, sizeof(*page));
|
||
|
|
||
|
char *filename = settings->stub.name;
|
||
|
u32 pt_size = settings->pt_size;
|
||
|
b32 use_hinting = settings->use_hinting;
|
||
|
|
||
|
// TODO(allen): Stop redoing all this init for each call.
|
||
|
FT_Library ft;
|
||
|
FT_Init_FreeType(&ft);
|
||
|
|
||
|
FT_Face face;
|
||
|
FT_New_Face(ft, filename, 0, &face);
|
||
|
|
||
|
FT_Size_RequestRec_ size = {};
|
||
|
size.type = FT_SIZE_REQUEST_TYPE_NOMINAL;
|
||
|
size.height = pt_size << 6;
|
||
|
FT_Request_Size(face, &size);
|
||
|
|
||
|
page->page_number = page_number;
|
||
|
|
||
|
// NOTE(allen): Determine glyph layout dimensions
|
||
|
i32 max_glyph_w = face->size->metrics.x_ppem;
|
||
|
i32 max_glyph_h = metrics->height;
|
||
|
i32 pen_y_descent = max_glyph_h + 2;
|
||
|
i32 tex_width = 64;
|
||
|
i32 tex_height = 0;
|
||
|
|
||
|
do {
|
||
|
tex_width *= 2;
|
||
|
f32 glyphs_per_row = ceilf(tex_width/(f32)max_glyph_w);
|
||
|
f32 rows = ceilf(GLYPHS_PER_PAGE/glyphs_per_row);
|
||
|
tex_height = ceil32(rows*pen_y_descent);
|
||
|
} while(tex_height > tex_width);
|
||
|
tex_height = round_up_pot_u32(tex_height);
|
||
|
|
||
|
i32 pen_x = 0;
|
||
|
i32 pen_y = 0;
|
||
|
|
||
|
// NOTE(allen): Fill the glyph bounds array
|
||
|
u32 ft_flags = font_ft_flags(use_hinting);
|
||
|
|
||
|
u32 codepoint = (page_number << 8);
|
||
|
Glyph_Bounds *glyph_out = &page->glyphs[0];
|
||
|
f32 *advance_out = &page->advance[0];
|
||
|
for (u32 i = 0; i < GLYPHS_PER_PAGE; ++i, ++codepoint, ++glyph_out, ++advance_out){
|
||
|
if (FT_Load_Char(face, codepoint, ft_flags) == 0){
|
||
|
i32 w = face->glyph->bitmap.width;
|
||
|
i32 h = face->glyph->bitmap.rows;
|
||
|
i32 ascent = metrics->ascent;
|
||
|
|
||
|
// NOTE(allen): Move to next line if necessary
|
||
|
if (pen_x + w >= tex_width){
|
||
|
pen_x = 0;
|
||
|
pen_y += pen_y_descent;
|
||
|
}
|
||
|
|
||
|
// NOTE(allen): Set all this stuff the renderer needs
|
||
|
glyph_out->x0 = (f32)(pen_x);
|
||
|
glyph_out->y0 = (f32)(pen_y);
|
||
|
glyph_out->x1 = (f32)(pen_x + w);
|
||
|
glyph_out->y1 = (f32)(pen_y + h + 1);
|
||
|
|
||
|
glyph_out->xoff = (f32)(face->glyph->bitmap_left);
|
||
|
glyph_out->yoff = (f32)(ascent - face->glyph->bitmap_top);
|
||
|
glyph_out->xoff2 = glyph_out->xoff + w;
|
||
|
glyph_out->yoff2 = glyph_out->yoff + h + 1;
|
||
|
|
||
|
// TODO(allen): maybe advance data should be integers?
|
||
|
*advance_out = (f32)ceil32(face->glyph->advance.x / 64.0f);
|
||
|
|
||
|
pen_x = ceil32(glyph_out->x1 + 1);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// TODO(allen): Not sure setting tex_height here is right... double check.
|
||
|
tex_height = round_up_pot_u32(pen_y + pen_y_descent);
|
||
|
|
||
|
page->tex_width = tex_width;
|
||
|
page->tex_height = tex_height;
|
||
|
page->has_layout = true;
|
||
|
|
||
|
FT_Done_FreeType(ft);
|
||
|
}
|
||
|
|
||
|
internal u32*
|
||
|
font_load_page_pixels(Partition *part, Font_Settings *settings, Glyph_Page *page, u32 page_number, i32 *tex_width_out, i32 *tex_height_out){
|
||
|
Assert(page != 0);
|
||
|
Assert(page->has_layout);
|
||
|
Assert(page->page_number == page_number);
|
||
|
|
||
|
char *filename = settings->stub.name;
|
||
|
i32 pt_size = settings->pt_size;
|
||
|
b32 use_hinting = settings->use_hinting;
|
||
|
|
||
|
// TODO(allen): Stop redoing all this init for each call.
|
||
|
FT_Library ft;
|
||
|
FT_Init_FreeType(&ft);
|
||
|
|
||
|
FT_Face face;
|
||
|
FT_New_Face(ft, filename, 0, &face);
|
||
|
|
||
|
FT_Size_RequestRec_ size = {};
|
||
|
size.type = FT_SIZE_REQUEST_TYPE_NOMINAL;
|
||
|
size.height = pt_size << 6;
|
||
|
FT_Request_Size(face, &size);
|
||
|
|
||
|
page->page_number = page_number;
|
||
|
|
||
|
// NOTE(allen): Prepare a pixel buffer.
|
||
|
i32 tex_width = page->tex_width;
|
||
|
i32 tex_height = page->tex_height;
|
||
|
|
||
|
u32* pixels = push_array(part, u32, tex_width*tex_height);
|
||
|
memset(pixels, 0, tex_width*tex_height*sizeof(u32));
|
||
|
|
||
|
// NOTE(allen): Fill the texture
|
||
|
u32 ft_flags = font_ft_flags(use_hinting);
|
||
|
|
||
|
u32 codepoint = (page_number << 8);
|
||
|
Glyph_Bounds *glyph_ptr = &page->glyphs[0];
|
||
|
for (i32 i = 0; i < GLYPHS_PER_PAGE; ++i, ++codepoint, ++glyph_ptr){
|
||
|
if (FT_Load_Char(face, codepoint, ft_flags) == 0){
|
||
|
// NOTE(allen): Extract this glyph's dimensions.
|
||
|
i32 x = (i32)glyph_ptr->x0;
|
||
|
i32 y = (i32)glyph_ptr->y0;
|
||
|
i32 w = (i32)(glyph_ptr->x1 - glyph_ptr->x0);
|
||
|
i32 h = (i32)(glyph_ptr->y1 - glyph_ptr->y0 - 1);
|
||
|
|
||
|
// NOTE(allen): Write to the pixels.
|
||
|
u8 *src = face->glyph->bitmap.buffer;
|
||
|
i32 pitch = face->glyph->bitmap.pitch;
|
||
|
i32 end_x = x + w;
|
||
|
i32 end_y = y + h;
|
||
|
for (i32 Y = y, YY = 0; Y < end_y; ++Y, ++YY){
|
||
|
for (i32 X = x, XX = 0; X < end_x; ++X, ++XX){
|
||
|
pixels[Y*tex_width + X] = 0x00FFFFFF + (0x01000000*src[YY*pitch + XX]);
|
||
|
//pixels[Y*tex_width + X] = (0x01010101*src[YY*pitch + XX]);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
*tex_width_out = tex_width;
|
||
|
*tex_height_out = tex_height;
|
||
|
|
||
|
FT_Done_FreeType(ft);
|
||
|
|
||
|
return(pixels);
|
||
|
}
|
||
|
|
||
|
internal b32
|
||
|
font_load(System_Functions *system, Font_Settings *settings, Font_Metrics *metrics, Font_Page_Storage *pages){
|
||
|
char *filename = settings->stub.name;
|
||
|
i32 pt_size = settings->pt_size;
|
||
|
|
||
|
// TODO(allen): Stop redoing all this init for each call.
|
||
|
FT_Library ft;
|
||
|
FT_Init_FreeType(&ft);
|
||
|
|
||
|
FT_Face face;
|
||
|
FT_New_Face(ft, filename, 0, &face);
|
||
|
|
||
|
FT_Size_RequestRec_ size = {};
|
||
|
size.type = FT_SIZE_REQUEST_TYPE_NOMINAL;
|
||
|
size.height = (pt_size << 6);
|
||
|
FT_Request_Size(face, &size);
|
||
|
|
||
|
// NOTE(allen): Set size and metrics
|
||
|
char *name = face->family_name;
|
||
|
u32 name_len = 0;
|
||
|
for (;name[name_len];++name_len);
|
||
|
name_len = clamp_top(name_len, sizeof(metrics->name)-1);
|
||
|
memcpy(metrics->name, name, name_len);
|
||
|
metrics->name[name_len] = 0;
|
||
|
metrics->name_len = name_len;
|
||
|
|
||
|
metrics->ascent = ceil32 (face->size->metrics.ascender / 64.0f);
|
||
|
metrics->descent = floor32 (face->size->metrics.descender / 64.0f);
|
||
|
metrics->advance = ceil32 (face->size->metrics.max_advance / 64.0f);
|
||
|
metrics->height = ceil32 (face->size->metrics.height / 64.0f);
|
||
|
metrics->line_skip = metrics->height - (metrics->ascent - metrics->descent);
|
||
|
metrics->height -= metrics->line_skip;
|
||
|
metrics->line_skip = 0;
|
||
|
|
||
|
// NOTE(allen): Set texture and glyph data.
|
||
|
Assert(font_get_page(pages, 0) == 0);
|
||
|
Glyph_Page *page = font_allocate_and_hash_new_page(system, pages, 0);
|
||
|
font_load_page_layout(settings, metrics, page, 0);
|
||
|
|
||
|
// NOTE(allen): Whitespace spacing stuff
|
||
|
i32 tab_width = 4;
|
||
|
|
||
|
f32 space_adv = page->advance[' '];
|
||
|
f32 backslash_adv = page->advance['\\'];
|
||
|
f32 r_adv = page->advance['r'];
|
||
|
|
||
|
page->advance['\n'] = space_adv;
|
||
|
page->advance['\r'] = backslash_adv + r_adv;
|
||
|
page->advance['\t'] = space_adv*tab_width;
|
||
|
|
||
|
// NOTE(allen): The rest of the metrics.
|
||
|
f32 max_hex_advance = 0.f;
|
||
|
for (u32 i = '0'; i <= '9'; ++i){
|
||
|
f32 adv = page->advance[i];
|
||
|
max_hex_advance = Max(max_hex_advance, adv);
|
||
|
}
|
||
|
for (u32 i = 'a'; i <= 'f'; ++i){
|
||
|
f32 adv = page->advance[i];
|
||
|
max_hex_advance = Max(max_hex_advance, adv);
|
||
|
}
|
||
|
for (u32 i = 'A'; i <= 'F'; ++i){
|
||
|
f32 adv = page->advance[i];
|
||
|
max_hex_advance = Max(max_hex_advance, adv);
|
||
|
}
|
||
|
|
||
|
metrics->byte_advance = backslash_adv + max_hex_advance*2;
|
||
|
metrics->sub_advances[0] = backslash_adv;
|
||
|
metrics->sub_advances[1] = max_hex_advance;
|
||
|
metrics->sub_advances[2] = max_hex_advance;
|
||
|
|
||
|
FT_Done_FreeType(ft);
|
||
|
|
||
|
return(true);
|
||
|
}
|
||
|
|
||
|
////////////////////////////////
|
||
|
|
||
|
internal
|
||
|
Sys_Font_Get_Count_Sig(system_font_get_count){
|
||
|
return(fontvars.count);
|
||
|
}
|
||
|
|
||
|
internal
|
||
|
Sys_Font_Get_Name_By_ID_Sig(system_font_get_name_by_id, str_out, capacity){
|
||
|
i32 length = 0;
|
||
|
if (0 < font_id && font_id <= fontvars.count){
|
||
|
u32 index = font_id - 1;
|
||
|
Font_Slot *slot = &fontvars.slots[index];
|
||
|
if (slot->is_active){
|
||
|
Font_Metrics *metrics = &slot->metrics;
|
||
|
length = metrics->name_len;
|
||
|
copy_partial_cs(str_out, capacity, make_string(metrics->name, length));
|
||
|
}
|
||
|
}
|
||
|
return(length);
|
||
|
}
|
||
|
|
||
|
internal
|
||
|
Sys_Font_Get_Pointers_By_ID_Sig(system_font_get_pointers_by_id, font_id){
|
||
|
Font_Pointers font = {0};
|
||
|
if (0 < font_id && font_id <= fontvars.count){
|
||
|
u32 index = font_id - 1;
|
||
|
Font_Slot *slot = &fontvars.slots[index];
|
||
|
if (slot->is_active){
|
||
|
font.valid = true;
|
||
|
font.settings = &slot->settings;
|
||
|
font.metrics = &slot->metrics;
|
||
|
font.pages = &slot->pages;
|
||
|
}
|
||
|
}
|
||
|
return(font);
|
||
|
}
|
||
|
|
||
|
internal
|
||
|
Sys_Font_Load_Page_Sig(system_font_load_page, settings, metrics, page, page_number){
|
||
|
Assert(page_number != 0);
|
||
|
font_load_page_layout(settings, metrics, page, page_number);
|
||
|
}
|
||
|
|
||
|
internal
|
||
|
Sys_Font_Allocate_Sig(system_font_allocate){
|
||
|
i64 *size_ptr = 0;
|
||
|
void *result = system_memory_allocate(size + sizeof(*size_ptr));
|
||
|
size_ptr = (i64*)result;
|
||
|
*size_ptr = size + 4;
|
||
|
return(size_ptr + 1);
|
||
|
}
|
||
|
|
||
|
internal
|
||
|
Sys_Font_Free_Sig(system_font_free){
|
||
|
if (ptr != 0){
|
||
|
i64 *size_ptr = ((i64*)ptr) - 1;
|
||
|
system_memory_free(size_ptr, *size_ptr);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
////////////////////////////////
|
||
|
|
||
|
internal Font_Setup*
|
||
|
system_font_get_stubs(Partition *part){
|
||
|
Font_Setup *first_setup = 0;
|
||
|
Font_Setup *head_setup = 0;
|
||
|
|
||
|
u32 dir_max = KB(32);
|
||
|
u8 *directory = push_array(part, u8, dir_max);
|
||
|
String dir_str = make_string_cap(directory, 0, dir_max);
|
||
|
u32 dir_len = dir_str.size = system_get_4ed_path(dir_str.str, dir_str.memory_size);
|
||
|
Assert(dir_len < dir_max);
|
||
|
|
||
|
set_last_folder_sc(&dir_str, "fonts", SLASH);
|
||
|
terminate_with_null(&dir_str);
|
||
|
dir_len = dir_str.size;
|
||
|
|
||
|
partition_reduce(part, dir_max - dir_len - 1);
|
||
|
partition_align(part, 8);
|
||
|
|
||
|
File_List file_list = {0};
|
||
|
system_set_file_list(&file_list, (char*)directory, 0, 0, 0);
|
||
|
|
||
|
for (u32 i = 0; i < file_list.count; ++i){
|
||
|
File_Info *info = &file_list.infos[i];
|
||
|
|
||
|
char *filename = info->filename;
|
||
|
u32 len = 0;
|
||
|
for (;filename[len];++len);
|
||
|
|
||
|
if (dir_len + len + 1 <= sizeof(head_setup->stub.name)){
|
||
|
if (first_setup == 0){
|
||
|
first_setup = push_struct(part, Font_Setup);
|
||
|
head_setup = first_setup;
|
||
|
}
|
||
|
else{
|
||
|
head_setup->next_font = push_struct(part, Font_Setup);
|
||
|
head_setup = head_setup->next_font;
|
||
|
}
|
||
|
head_setup->next_font = 0;
|
||
|
|
||
|
head_setup->stub.in_local_folder = true;
|
||
|
memcpy(&head_setup->stub.name[0], directory, dir_len);
|
||
|
memcpy(&head_setup->stub.name[dir_len], filename, len + 1);
|
||
|
head_setup->stub.len = dir_len + len;
|
||
|
|
||
|
partition_align(part, 8);
|
||
|
}
|
||
|
|
||
|
|
||
|
}
|
||
|
|
||
|
system_set_file_list(&file_list, 0, 0, 0, 0);
|
||
|
|
||
|
return(first_setup);
|
||
|
}
|
||
|
|
||
|
internal void
|
||
|
system_font_init(Font_Functions *font, u32 pt_size, b32 use_hinting, Font_Setup *font_setup_head){
|
||
|
// Linking
|
||
|
font->get_count = system_font_get_count;
|
||
|
font->get_name_by_id = system_font_get_name_by_id;
|
||
|
font->get_pointers_by_id = system_font_get_pointers_by_id;
|
||
|
font->load_page = system_font_load_page;
|
||
|
font->allocate = system_font_allocate;
|
||
|
font->free = system_font_free;
|
||
|
|
||
|
// Filling initial fonts
|
||
|
//i32 font_count_max = ArrayCount(fontvars.slots);
|
||
|
i32 font_count_max = 1;
|
||
|
i32 font_count = 0;
|
||
|
i32 i = 0;
|
||
|
for (Font_Setup *ptr = font_setup_head;
|
||
|
ptr != 0;
|
||
|
ptr = ptr->next_font){
|
||
|
char *filename = ptr->stub.name;
|
||
|
|
||
|
if (i < font_count_max){
|
||
|
Font_Slot *slot = &fontvars.slots[i];
|
||
|
Font_Settings *settings = &slot->settings;
|
||
|
Font_Metrics *metrics = &slot->metrics;
|
||
|
Font_Page_Storage *pages = &slot->pages;
|
||
|
|
||
|
Assert(!slot->is_active);
|
||
|
|
||
|
i32 filename_len = 0;
|
||
|
for (;filename[filename_len];++filename_len);
|
||
|
|
||
|
if (filename_len <= sizeof(settings->stub.name) - 1){
|
||
|
memset(settings, 0, sizeof(*settings));
|
||
|
memset(metrics, 0, sizeof(*metrics));
|
||
|
memset(pages, 0, sizeof(*pages));
|
||
|
|
||
|
// Initialize Font Parameters
|
||
|
memcpy(&settings->stub, &ptr->stub, sizeof(ptr->stub));
|
||
|
settings->pt_size = pt_size;
|
||
|
settings->use_hinting = use_hinting;
|
||
|
|
||
|
b32 success = font_load(&sysfunc, settings, metrics, pages);
|
||
|
if (!success){
|
||
|
memset(font, 0, sizeof(*font));
|
||
|
LOGF("font \"%.*s\" failed to load, unknown error\n", filename_len, filename);
|
||
|
}
|
||
|
else{
|
||
|
slot->is_active = true;
|
||
|
++i;
|
||
|
}
|
||
|
}
|
||
|
else{
|
||
|
LOGF("font \"%.*s\" name is too long to load in current build (max %d)\n", filename_len, filename, (i32)(sizeof(settings->stub.name) - 1));
|
||
|
}
|
||
|
}
|
||
|
else{
|
||
|
LOGF("Exceeded maximum font slots (%d) skipping %s\n", font_count_max, filename);
|
||
|
}
|
||
|
|
||
|
++font_count;
|
||
|
}
|
||
|
|
||
|
fontvars.count = clamp_top(font_count, font_count_max);
|
||
|
}
|
||
|
|
||
|
// BOTTOM
|
||
|
|