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-rw-r--r--host/main.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/host/main.c b/host/main.c
new file mode 100644
index 0000000..48532f7
--- /dev/null
+++ b/host/main.c
@@ -0,0 +1,357 @@
+
+#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
+// ...also, it does a hardcodes setlocale of LC_CTYPE to en_US.utf8 for... reasons.
+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;
+
+ // Calculate screen width of string prior to allocating memory for the frame buffer
+ 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(;;){
+ while(*p == '\033'){
+ p++;
+ // Jump over escape sequences
+ for(;;p++){
+ if(!(*p == ';' || *p == '[' || ('0' <= *p && *p <= '9'))){
+ p++;
+ break;
+ }
+ }
+ memset(&ps, 0, sizeof(mbstate_t));
+ }
+
+ 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
+ };
+ // Render glyphs (now with escape sequence rendering!)
+ 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!
+ // Disassemble the list of numbers, only accept SGR sequences (those ending with 'm')
+ 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;
+ }
+ // Parse the sequence numbers
+ 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;
+
+ // Render glyph into frame buffer
+ 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;
+ }
+
+ // Render framebuffer to terminal, two pixels per character using Unicode box drawing stuff
+ 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
+ // The following, rather convoluted logic tries to "save" escape sequences when rendering.
+ 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;
+}
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