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#include "font.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void render_glyph(glyph_t *g, color_t *buf, unsigned int bufwidth, unsigned int offx, unsigned int offy, color_t fg, color_t bg){
unsigned int bitmap_row_width = g->width/8;
uint8_t *bitmap = ((uint8_t *)g) + sizeof(glyph_t);
for(unsigned int y=0; y < g->height; y++){
long int data = 0;
for(unsigned int i=0; i<bitmap_row_width; i++){
data <<= 8;
data |= bitmap[y*bitmap_row_width+i];
}
color_t *p = buf + (offy+y)*bufwidth + offx;
for(unsigned int x=0; x < g->width; x++){
color_t c = (data&(1<<(g->width-1))) ? fg : bg;
*p++ = c;
data <<= 1;
}
}
}
int read_bdf(FILE *f, glyph_t **glyph_table, unsigned int glyph_table_size){
char* line = 0;
size_t len = 0;
glyph_t current_glyph = {-1, -1, -1, -1};
unsigned int dwidth = -1;
unsigned int encoding = -1;
void *glyph_data = 0;
// Clear glyph table before use
memset(glyph_table, 0, sizeof(*glyph_table));
for(;;){
size_t read = getline(&line, &len, f);
if(read == -1){
fprintf(stderr, "Could not read line from font file\n");
goto error;
}
if(read < 2) // Ignore empty lines
continue;
line[read-1] = '\0';
char *endptr;
char *args = strchr(line, ' ');
if(args){
*args = 0;
args++;
}
if(strcmp("ENDFONT", line) == 0){
break;
}else if(strcmp("ENCODING", line) == 0){
if(!args){
fprintf(stderr, "Invalid ENCODING line: %s %s\n", line, args);
goto error;
}
encoding = strtol(args, &endptr, 10);
if(args == endptr || *endptr != '\0'){
fprintf(stderr, "Invalid ENCODING line: %s %s\n", line, args);
goto error;
}
if(encoding > glyph_table_size){
fprintf(stderr, "Codepoint out of valid range (0-%d): %d", glyph_table_size, encoding);
goto error;
}
}else if(strcmp("BBX", line) == 0){
if(!args){
fprintf(stderr, "Invalid ENCODING line: %s %s\n", line, args);
goto error;
}
endptr = 0;
char *w = strtok_r(args, " ", &endptr);
char *h = strtok_r(NULL, " ", &endptr);
char *x = strtok_r(NULL, " ", &endptr);
char *y = strtok_r(NULL, " ", &endptr);
if(!w || !h || !x || !y){
fprintf(stderr, "Invalid BBX line: %s %s\n", line, args);
goto error;
}
current_glyph.width = atoi(w);
current_glyph.height = atoi(h);
current_glyph.x = atoi(x);
current_glyph.y = atoi(y);
}else if(strcmp("DWIDTH", line) == 0){
if(!args){
fprintf(stderr, "Invalid ENCODING line: %s %s\n", line, args);
goto error;
}
endptr = 0;
char *w = strtok_r(args, " ", &endptr);
char *h = strtok_r(NULL, " ", &endptr);
if(!w || !h){
fprintf(stderr, "Invalid DWIDTH line: %s %s\n", line, args);
goto error;
}
dwidth = strtol(w, &endptr, 10);
if(w == endptr || *endptr != '\0'){
fprintf(stderr, "Invalid DWIDTH line: %s %s\n", line, args);
goto error;
}
}else if(strcmp("BITMAP", line) == 0){
unsigned int row_bytes = dwidth/8;
glyph_data = malloc(sizeof(glyph_t) + row_bytes * current_glyph.height);
if(!glyph_data){
fprintf(stderr, "Cannot malloc() memory.\n");
goto error;
}
uint8_t *bitmap = (uint8_t *)glyph_data + sizeof(glyph_t);
if(current_glyph.width < 0 || dwidth < 0 || encoding < 0){
fprintf(stderr, "Invalid glyph: ");
if(current_glyph.width < 0)
fprintf(stderr, "No bounding box given.");
if(dwidth < 0)
fprintf(stderr, "No data width given.");
if(encoding < 0)
fprintf(stderr, "No codepoint given.");
fprintf(stderr, "\n");
goto error;
}
if(current_glyph.width != dwidth){
fprintf(stderr, "Invalid glyph: bounding box width != dwidth\n");
goto error;
}
unsigned int i=0;
while(1){
read = getline(&line, &len, f);
if(read == -1){
fprintf(stderr, "Could not read line from font file\n");
goto error;
}
if(read < 2) // Ignore empty lines
continue;
line[read-1] = '\0';
if(strncmp("ENDCHAR", line, read) == 0)
break;
if(i >= current_glyph.height){
fprintf(stderr, "Too many rows of bitmap data in glyph %d: %d > %d\n", encoding, i+1, current_glyph.height);
goto error;
}
//XXX This limits the maximum character width to sizeof(long)*8 (normally 64) piccells.
long int data = strtol(line, &endptr, 16);
if(line == endptr || *endptr != '\0'){
fprintf(stderr, "Invalid bitmap data in glyph %d: %s\n", encoding, line);
goto error;
}
// Right-align data
data >>= ((read-1)*4 - dwidth);
// Copy rightmost bytes of data to destination buffer
for(unsigned int j=0; j<row_bytes; j++){
bitmap[(i+1)*row_bytes-j-1] = data&0xFF;
data >>= 8;
}
i++;
}
memcpy(glyph_data, ¤t_glyph, sizeof(glyph_t));
glyph_table[encoding] = glyph_data;
// Reset things for next iteration
current_glyph.width = -1;
current_glyph.height = -1;
current_glyph.x = -1;
current_glyph.y = -1;
dwidth = -1;
encoding = -1;
}
}
return 0;
error:
// Free malloc()ed glyphs
free(glyph_data);
for(unsigned int i=0; i<sizeof(glyph_table)/sizeof(glyph_t *); i++)
free(glyph_table[i]);
return 1;
}
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