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#include <fontconfig/fontconfig.h>
#include "font.h"
char* get_font(const char* font_name) {
FcPattern* pattern = FcNameParse((const FcChar8*)font_name);
if (!pattern) {
fprintf(stderr, "Failed to create font pattern\n");
return NULL;
}
FcConfigSubstitute(0, pattern, FcMatchPattern);
FcDefaultSubstitute(pattern);
FcResult result = 0;
FcFontSet* font_patterns = FcFontSort(0, pattern, FcTrue, 0, &result);
if (!font_patterns || !font_patterns->nfont) {
fprintf(stderr, "No fonts installed on system\n");
return NULL;
}
FcFontSet* fs = FcFontSetCreate();
FcPattern* font_pattern = FcFontRenderPrepare(0, pattern, font_patterns->fonts[0]);
if (!font_pattern) {
fprintf(stderr, "Could not prepare matched font for loading\n");
return NULL;
}
FcFontSetAdd(fs, font_pattern);
FcFontSetSortDestroy(font_patterns);
FcPatternDestroy(pattern);
if (!fs || !font_patterns->nfont) {
fprintf(stderr, "Could not prepare font set\n");
}
FcObjectSet* os = FcObjectSetBuild(FC_FILE, (char*)0);
FcValue v = { 0 };
FcPattern* fontp = FcPatternFilter(fs->fonts[0], os);
FcPatternGet(fontp, FC_FILE, 0, &v);
char* font = strdup((char*)v.u.f);
FcPatternDestroy(fontp);
FcFontSetDestroy(fs);
FcObjectSetDestroy(os);
return font;
}
bool freetype_init(client_state* state, const char* file) {
if (FT_Init_FreeType(&state->ft_library)) {
fprintf(stderr, "Failed to intalize FreeType Library\n");
return false;
}
if (FT_New_Face(state->ft_library, file, 0, &state->ft_face)) {
fprintf(stderr, "Failed to create font\n");
return false;
}
if (FT_Set_Char_Size(state->ft_face, 0, 12 << 6, 0, 0)) {
fprintf(stderr, "Failed to set font size\n");
return false;
}
state->load_flags = FT_LOAD_RENDER | FT_LOAD_TARGET_(FT_RENDER_MODE_SDF);
return true;
}
void atlas_init(client_state* state) {
for (int i = 32; i < 128; i++) {
if (FT_Load_Char(state->ft_face, i, state->load_flags)) {
fprintf(stderr, "Failed to render character %c\n", (char)i);
}
state->atlas.width += state->ft_face->glyph->bitmap.width;
state->atlas.height = MAX(state->atlas.height, state->ft_face->glyph->bitmap.rows);
metric_t* metric = &state->atlas.metrics[i];
metric->advance_x = (float)state->ft_face->glyph->advance.x / 64;
metric->advance_y = (float)state->ft_face->glyph->advance.y / 64;
metric->bitmap_width = state->ft_face->glyph->bitmap.width;
metric->bitmap_height = state->ft_face->glyph->bitmap.rows;
}
}
void atlas_create_texture(client_state* state) {
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &state->atlas.texture);
glBindTexture(GL_TEXTURE_2D, state->atlas.texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RED,
(GLsizei) state->atlas.width,
(GLsizei) state->atlas.height,
0,
GL_RED,
GL_UNSIGNED_BYTE,
NULL);
uint32_t x = 0;
for (int i = 32; i < 128; i++) {
if (FT_Load_Char(state->ft_face, i, state->load_flags)) {
fprintf(stderr, "Failed to render character %c\n", (char)i);
}
metric_t* metric = &state->atlas.metrics[i];
metric->texture_offset = (float)x / state->atlas.width;
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexSubImage2D(
GL_TEXTURE_2D,
0,
x,
0,
state->ft_face->glyph->bitmap.width,
state->ft_face->glyph->bitmap.rows,
GL_RED,
GL_UNSIGNED_BYTE,
state->ft_face->glyph->bitmap.buffer);
x += state->ft_face->glyph->bitmap.width;
metric->texture_size = (float)x / state->atlas.width;
}
}
int atlas_get_strwidth(client_state* state, const char* str) {
float width = 0;
for (int i = 0; i < strlen(str); i++) {
width += ceil(state->atlas.metrics[(int)str[i]].advance_x);
}
return (int)ceil(width);
}
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