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#include "font.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#define FILE_NAME_SIZE 300
void free_sprite_font(sprite_font* font) {
free(font->characters);
SDL_DestroyTexture(font->spritesheet);
memset(font, 0, sizeof(sprite_font));
}
int get_string_parameter(const char* line, const char* parameter, const char** start) {
*start = strstr(line, parameter);
if ((*start) == NULL)
return -1;
*start += strlen(parameter);
if ((*start)[0] != '\"') {
return -1;
}
int length = 0;
while ((*start)[length+1] != '\0' && (*start)[length+1] != '\"') length++;
(*start)++;
return length;
}
char parse_character_tag(const char* character_tag) {
if (strncmp(character_tag, "space", 5) == 0)
return ' ';
return character_tag[0];
}
bool get_int_parameter(const char* line, const char* parameter, int* value) {
const char* start = strstr(line, parameter);
if (start == NULL) {
return false;
}
start += strlen(parameter);
int c = 0;
bool negative = false;
if (start[0] == '-') {
negative = true;
start++;
}
for(int i = 0; start[i] >= '0' && start[i] <= '9'; i++) {
c *= 10; c += start[i] - '0';
}
*value = negative ? -c : c;
return true;
}
bool load_sprite_font(const char* filename, sprite_font* font) {
if (font->characters || font->spritesheet) {
SDL_Log("Trying to reallocate font causing memory leak, exitting!");
exit(EXIT_FAILURE);
}
FILE* f = fopen(filename, "r");
if (f == NULL) {
SDL_Log("Failed to open sprite font file %s, error: %s, exitting!",
filename,
strerror(errno)
);
exit(EXIT_FAILURE);
}
char line[PARSER_LINE_SIZE];
if (fgets(line, sizeof(line), f) == NULL ||
strncmp(line, "info", 4) != 0) {
SDL_Log("File %s is not a valid font file, exitting!",
filename);
fclose(f);
exit(EXIT_FAILURE);
}
char font_name[FONT_NAME_SIZE];
const char* font_name_start;
int font_name_length =
SDL_min(get_string_parameter(line, "face=", &font_name_start),
FONT_NAME_SIZE-1
);
strncpy(font_name, font_name_start, font_name_length);
font_name[font_name_length] = '\0';
int char_size = 0, char_count = 0;
font_char* characters_unarranged = NULL;
while (fgets(line, PARSER_LINE_SIZE, f) != NULL) {
if (strncmp(line, "chars", 5) == 0) {
int total_char_count;
if(!get_int_parameter(line, "count=", &total_char_count))
continue;
char_size = total_char_count;
characters_unarranged =
realloc(characters_unarranged, char_size * sizeof(font_char));
if (characters_unarranged == NULL) {
SDL_Log("Failed to allocate space while loading font %s, error %s, exitting!",
filename,
strerror(errno));
exit(EXIT_FAILURE);
}
}
else if (strncmp(line, "char", 4) == 0) {
font_char new_font_char;
int val;
if (!get_int_parameter(line, "x=", &val))
continue;
new_font_char.x = val;
if (!get_int_parameter(line, "y=", &val))
continue;
new_font_char.y = val;
if (!get_int_parameter(line, "width=", &val))
continue;
new_font_char.width = val;
if (!get_int_parameter(line, "height=", &val))
continue;
new_font_char.height = val;
if (!get_int_parameter(line, "xoffset=", &val))
continue;
new_font_char.x_offset = val;
if (!get_int_parameter(line, "yoffset=", &val))
continue;
new_font_char.y_offset = val;
if (!get_int_parameter(line, "xadvance=", &val))
continue;
new_font_char.x_advance = val;
const char* character_tag;
if (get_string_parameter(line, "letter=", &character_tag) <= 0)
continue;
new_font_char.character = parse_character_tag(character_tag);
if (char_count >= char_size) {
char_size = char_count+1;
characters_unarranged =
realloc(characters_unarranged, char_size * sizeof(font_char));
}
if (characters_unarranged == NULL) {
SDL_Log("Failed to allocate space while loading font %s, error %s, exitting!",
filename,
strerror(errno));
exit(EXIT_FAILURE);
}
characters_unarranged[char_count] = new_font_char;
char_count++;
}
}
fclose(f);
return true;
}
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