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|
#include "font.h"
#include "color.h"
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <wchar.h>
#include <locale.h>
#include <sys/timeb.h>
#include <unistd.h>
/* CAUTION: REQUIRES INPUT TO BE \0-TERMINATED */
int console_render(char *s, glyph_t **glyph_table, unsigned int glyph_table_size){
unsigned int len = strlen(s);
uint8_t *gbuf = NULL;
unsigned int gbufwidth = 0;
unsigned int gbufheight = 0;
char *p = s;
wchar_t c;
mbstate_t ps = {0};
memset(&ps, 0, sizeof(mbstate_t));
if(!setlocale(LC_CTYPE, "en_US.utf8")){
fprintf(stderr, "Cannot set locale\n");
goto error;
}
for(;;){
if(*p == '\033'){
p++;
// Jump over escape sequences
for(;;p++){
if(!(*p == ';' || *p == '[' || ('0' < *p && *p < '9'))){
p++;
break;
}
}
}
size_t inc = mbrtowc(&c, p, MB_CUR_MAX, &ps); // MB_CUR_MAX is safe since p is \0-terminated
if(inc == -1 || inc == -2){
fprintf(stderr, "Error rendering string: No valid UTF-8 input.\n");
goto error;
}
if(inc == 0) // Reached end of string
break;
p += inc;
if(c > glyph_table_size){
fprintf(stderr, "Error rendering string: Codepoint 0x%lx out of valid range (0-%d).\n", (long int)c, glyph_table_size);
goto error;
}
glyph_t *g = glyph_table[c];
if(!g){
fprintf(stderr, "Error rendering string: Codepoint 0x%lx not in font.\n", (long int)c);
goto error;
}
if(g->height > gbufheight)
gbufheight = g->height;
gbufwidth += g->width;
}
// For easier rendering on the terminal, round up to multiples of two
gbufheight += gbufheight&1;
// gbuf uses 3 bytes per color for r, g and b
unsigned int gbufsize = gbufwidth*3*gbufheight;
gbuf = malloc(gbufsize);
if(gbuf == 0){
fprintf(stderr, "Cannot malloc() %d bytes.\n", gbufsize);
goto error;
}
memset(gbuf, 0, gbufsize);
unsigned int x = 0;
p = s;
memset(&ps, 0, sizeof(mbstate_t));
struct {
color_t fg;
color_t bg;
unsigned int blink:4;
unsigned int bold:1; // TODO
unsigned int underline:1;
unsigned int strikethrough:1;
unsigned int fraktur:1; // TODO See: Flat10 Fraktur font
unsigned int invert:1;
} style = {
colortable[DEFAULT_FG_COLOR], colortable[DEFAULT_BG_COLOR], 0, 0, 0, 0, 0, 0
};
for(;;){
// NOTE: This nested escape sequence parsing does not contain any unicode-awareness whatsoever
if(*p == '\033'){ // Escape sequence YAY
char *sequence_start = ++p;
if(*p == '['){ // This was a CSI!
long elems[MAX_CSI_ELEMENTS];
int nelems;
for(nelems = 0; nelems<MAX_CSI_ELEMENTS; nelems++){
p++;
char *endptr;
elems[nelems] = strtol(p, &endptr, 10);
if(p == endptr){
fprintf(stderr, "Invalid escape sequence: \"\\e%s\"\n", sequence_start);
goto error;
}
p = endptr;
if(*endptr == 'm')
break;
if(*endptr != ';'){
fprintf(stderr, "Invalid escape sequence: \"\\e%s\"\n", sequence_start);
goto error;
}
}
p++; // gobble up trailing 'm' of "\033[23;42m"
nelems++;
// By now we know it's a SGR since we error'ed out on anything else
if(nelems < 1){
fprintf(stderr, "Unsupported escape sequence: \"\\e%s\"\n", sequence_start);
goto error;
}
for(int i=0; i<nelems; i++){
switch(elems[i]){
case 0: // reset style
style.fg = colortable[DEFAULT_FG_COLOR];
style.bg = colortable[DEFAULT_BG_COLOR];
style.bold = 0;
style.underline = 0;
style.blink = 0;
style.strikethrough = 0;
style.fraktur = 0;
style.invert = 0;
break;
case 1: // bold
style.bold = 1;
break;
case 4: // underline
style.underline = 1;
break;
case 5: // slow blink
style.blink = 1;
break;
case 6: // rapid blink
style.blink = 8;
break;
case 7: // color invert on
style.invert = 1;
break;
case 9: // strike-through
style.strikethrough = 1;
break;
case 20:// Fraktur
style.fraktur = 1;
break;
case 22:// Bold off
style.bold = 0;
break;
case 24:// Underline off
style.underline = 0;
break;
case 25:// Blink off
style.blink = 0;
break;
case 27:// color invert off
style.invert = 0;
break;
case 29:// strike-through off
style.strikethrough = 0;
break;
case 30: // Set foreground color, "dim" colors
case 31:
case 32:
case 33:
case 34:
case 35:
case 36:
case 37:
style.fg = colortable[elems[i]-30];
break;
case 38: // Set xterm-256 foreground color
i++;
if(nelems-i < 2 || elems[i] != 5){
fprintf(stderr, "Invalid ANSI escape code: \"\\e%s\"\n", sequence_start);
goto error;
}
style.fg = colortable[elems[++i]];
break;
case 39: // Reset foreground color to default
style.bg = colortable[DEFAULT_FG_COLOR];
break;
case 40: // Set background color, "dim" colors
case 41:
case 42:
case 43:
case 44:
case 45:
case 46:
case 47:
style.bg = colortable[elems[i]-40];
break;
case 48: // Set xterm-256 background color
i++;
if(nelems-i < 2 || elems[i] != 5){
fprintf(stderr, "Invalid ANSI escape code: \"\\e%s\"\n", sequence_start);
goto error;
}
style.bg = colortable[elems[++i]];
break;
case 49: // Reset background color to default
style.bg = colortable[DEFAULT_BG_COLOR];
break;
case 90: // Set foreground color, "bright" colors
case 91:
case 92:
case 93:
case 94:
case 95:
case 96:
case 97:
style.fg = colortable[elems[i]-90+8];
break;
case 100: // Set background color, "bright" colors
case 101:
case 102:
case 103:
case 104:
case 105:
case 106:
case 107:
style.bg = colortable[elems[i]-100+8];
break;
default:
fprintf(stderr, "Unsupported escape sequence: \"\\e%s\"\n", sequence_start);
goto error;
}
}
}else{
fprintf(stderr, "Unsupported escape sequence: \"\\e%s\"\n", sequence_start);
goto error;
}
continue;
}
size_t inc = mbrtowc(&c, p, (s+len+1)-p, NULL);
// If p contained
if(inc == 0) // Reached end of string
break;
p += inc;
struct timeb time = {0};
ftime(&time);
unsigned long int t = time.time*1000 + time.millitm;
int blink = style.blink && (t % (1000/style.blink) < (333/style.blink));
int inv = !(style.invert ^ blink);
color_t fg = inv ? style.fg : style.bg;
color_t bg = inv ? style.bg : style.fg;
glyph_t *g = glyph_table[c];
render_glyph(g, gbuf, gbufwidth, x, 0, fg, bg);
if(style.strikethrough || style.underline){
int sty = gbufheight/2;
// g->y usually is a negative index of the glyph's baseline measured from the glyph's bottom
int uly = gbufheight + g->y;
for(int i=0; i<g->width; i++){
if(style.strikethrough)
*((color_t *)(gbuf + (sty*gbufwidth + x + i)*3)) = fg;
if(style.underline)
*((color_t *)(gbuf + (uly*gbufwidth + x + i)*3)) = fg;
}
}
x += g->width;
}
color_t lastfg = {0, 0, 0}, lastbg = {0, 0, 0};
printf("\e[38;5;0;48;5;0m");
for(unsigned int y=0; y < gbufheight; y+=2){
for(unsigned int x=0; x < gbufwidth; x++){
//Da magicks: ▀█▄
color_t ct = *((color_t *)(gbuf + (y*gbufwidth + x)*3)); // Top pixel
color_t cb = *((color_t *)(gbuf + ((y+1)*gbufwidth + x)*3)); // Bottom pixel
if(!memcmp(&ct, &lastfg, sizeof(color_t))){
if(!memcmp(&cb, &lastbg, sizeof(color_t))){
printf("▀");
}else if(!memcmp(&cb, &lastfg, sizeof(color_t))){
printf("█");
}else{
printf("\033[48;5;%dm▀", xterm_color_index(cb));
lastbg = cb;
}
}else if(!memcmp(&ct, &lastbg, sizeof(color_t))){
if(!memcmp(&cb, &lastfg, sizeof(color_t))){
printf("▄");
}else if(!memcmp(&cb, &lastbg, sizeof(color_t))){
printf(" ");
}else{
printf("\033[38;5;%dm▄", xterm_color_index(cb));
lastfg = cb;
}
}else{ // No matches for the upper pixel
if(!memcmp(&cb, &lastfg, sizeof(color_t))){
printf("\033[48;5;%dm▄", xterm_color_index(ct));
lastbg = ct;
}else if(!memcmp(&cb, &lastbg, sizeof(color_t))){
printf("\033[38;5;%dm▀", xterm_color_index(ct));
lastfg = ct;
}else{
printf("\033[38;5;%d;48;5;%dm▀", xterm_color_index(ct), xterm_color_index(cb));
lastfg = ct;
lastbg = cb;
}
}
}
printf("\n");
}
return 0;
error:
free(gbuf);
return 1;
}
int main(int argc, char **argv){
FILE *f = fopen("unifont.bdf", "r");
if(!f){
fprintf(stderr, "Error opening font file: %s\n", strerror(errno));
return 1;
}
glyph_t* glyph_table[BLP_SIZE];
if(read_bdf(f, glyph_table, BLP_SIZE)){
fprintf(stderr, "Error reading font file.\n");
return 1;
}
for(;;){
printf("\033[2J");
for(unsigned int i=1; i<argc; i++){
if(console_render(argv[i], glyph_table, BLP_SIZE)){
fprintf(stderr, "Error rendering text.\n");
return 1;
}
printf("\n");
}
usleep(20000);
}
return 0;
}
|
