1#include "alba.h"
 2
 3#include <pthread.h>
 4
 5#include "freetype/ftglyph.h"
 6
 7#include "internal.h"
 8
 9extern char _binary_Roboto_Regular_ttf_start[];
10extern char _binary_Roboto_Regular_ttf_end[];
11
12static FT_Library freetype = NULL;
13static FT_Face roboto = NULL;
14Atlas atlas;
15pthread_mutex_t freetype_mutex = PTHREAD_MUTEX_INITIALIZER;
16
17void initialize_freetype()
18{
19    // already initialized
20    if (freetype != NULL) return;
21
22    pthread_mutex_lock(&freetype_mutex);
23    if (FT_Init_FreeType(&freetype))
24    {
25        printf("fatal error: initializeing FreeType failed");
26        pthread_mutex_unlock(&freetype_mutex);
27        exit(1);
28    }
29
30    FT_Error error = FT_New_Memory_Face(
31        freetype,
32        _binary_Roboto_Regular_ttf_start,
33        _binary_Roboto_Regular_ttf_end - _binary_Roboto_Regular_ttf_start,
34        0, // face index
35        &roboto
36    );
37    if (error)
38    {
39        printf("error: cound not load built in Roboto font");
40    }
41    error = FT_Set_Pixel_Sizes(roboto, 0 /* width, same as height */, 18);
42    if (error)
43    {
44        printf("error: cound not set Roboto face size");
45    }
46
47    atlas = atlas_new(1024);
48
49    pthread_mutex_unlock(&freetype_mutex);
50}
51
52
53void draw_text(AlbaWindow* window, const float x, const float y, uint64_t length, const char* text)
54{
55    initialize_freetype();
56
57    if (length == 0)
58    {
59        length = strlen(text);
60    }
61
62    pthread_mutex_lock(&freetype_mutex);
63    for (uint64_t i = 0; i < length; i++)
64    {
65        atlas_append(&atlas, roboto, text[i]); // TODO: unicode
66    }
67    pthread_mutex_unlock(&freetype_mutex);
68
69    // FT_Error error = FT_Load_Char(roboto, '7', FT_LOAD_RENDER);
70    // printf("%d\n", roboto->glyph->bitmap.width);
71    // error = FT_Load_Char(roboto, 'l', FT_LOAD_RENDER);
72    // printf("%d\n", roboto->glyph->bitmap.width);
73    // error = FT_Load_Char(roboto, 'm', FT_LOAD_RENDER);
74    // printf("%d\n", roboto->glyph->bitmap.width);
75
76    atlas_generate_image(&atlas);
77
78    WGPUTexture texture = create_texture(
79        window,
80        WGPUTextureUsage_TextureBinding | WGPUTextureUsage_CopyDst,
81        atlas.width, atlas.height,
82        WGPUTextureFormat_RG8Unorm, 1, // TODO: do not assume format
83        atlas.image
84    );
85
86    // window.
87}