356 lines
9.8 KiB
C
356 lines
9.8 KiB
C
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#include "config.h"
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#include "bdf.h"
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#include "color.h"
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#include "font.h"
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <wchar.h>
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#include <locale.h>
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#include <sys/timeb.h>
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#include <sys/queue.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <unistd.h>
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/* CAUTION: REQUIRES INPUT TO BE \0-TERMINATED
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* ...also, it does a hardcoded setlocale of LC_CTYPE to en_US.utf8 for... reasons. */
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int framebuffer_get_text_bounds(char *s, glyphtable_t *glyph_table, size_t *outw, size_t *outh){
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size_t gbufwidth = 0;
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size_t gbufheight = 0;
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char *p = s;
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/* Calculate screen width of string prior to allocating memory for the frame buffer */
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wchar_t c;
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mbstate_t ps = {0};
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memset(&ps, 0, sizeof(mbstate_t));
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if(!setlocale(LC_CTYPE, "en_US.utf8")){
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fprintf(stderr, "Cannot set locale\n");
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goto error;
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}
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for(;;){
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while(*p == '\033'){
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p++;
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/* Jump over escape sequences */
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for(;;p++){
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if(!(*p == ';' || *p == '[' || ('0' <= *p && *p <= '9'))){
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p++;
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break;
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}
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}
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memset(&ps, 0, sizeof(mbstate_t));
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}
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size_t inc = mbrtowc(&c, p, MB_CUR_MAX, &ps); /* MB_CUR_MAX is safe since p is \0-terminated */
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if(inc == -1 || inc == -2){
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fprintf(stderr, "Error rendering string: No valid UTF-8 input.\n");
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goto error;
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}
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if(inc == 0) /* Reached end of string */
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break;
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p += inc;
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if(c > glyph_table->size){
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fprintf(stderr, "Error rendering string: Codepoint 0x%lx out of valid range (0-%zd).\n", (long int)c, glyph_table->size);
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goto error;
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}
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glyph_t *g = glyph_table->data[c];
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if(!g){
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fprintf(stderr, "Error rendering string: Codepoint 0x%lx not in font.\n", (long int)c);
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goto error;
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}
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if(g->height > gbufheight)
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gbufheight = g->height;
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gbufwidth += g->width;
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}
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*outw = gbufwidth;
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*outh = gbufheight;
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return 0;
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error:
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return 1;
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}
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/* CAUTION: REQUIRES INPUT TO BE \0-TERMINATED
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* ...also, it does a hardcoded setlocale of LC_CTYPE to en_US.utf8 for... reasons. */
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/* Render the string beginning from the specified x offset (in pixels) */
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int framebuffer_render_text(char *s, glyphtable_t *glyph_table, color_t *gbuf, size_t gbufwidth, size_t gbufheight, size_t offx){
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unsigned int len = strlen(s);
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char *p = s;
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if(!setlocale(LC_CTYPE, "en_US.utf8")){
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fprintf(stderr, "Cannot set locale\n");
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goto error;
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}
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memset(gbuf, 0, gbufwidth*gbufheight*sizeof(color_t));
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unsigned int x = 0;
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wchar_t c;
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p = s;
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mbstate_t ps = {0};
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memset(&ps, 0, sizeof(mbstate_t));
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struct {
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color_t fg;
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color_t bg;
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unsigned int blink:4;
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unsigned int bold:1; /* TODO */
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unsigned int underline:1;
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unsigned int strikethrough:1;
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unsigned int fraktur:1; /* TODO See: Flat10 Fraktur font */
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unsigned int invert:1;
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} style = {
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colortable[DEFAULT_FG_COLOR], colortable[DEFAULT_BG_COLOR], 0, 0, 0, 0, 0, 0
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};
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/* Render glyphs (now with escape sequence rendering!) */
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for(;;){
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/* NOTE: This nested escape sequence parsing does not contain any unicode-awareness whatsoever */
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if(*p == '\033'){ /* Escape sequence YAY */
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char *sequence_start = ++p;
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if(*p == '['){ /* This was a CSI! */
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/* Disassemble the list of numbers, only accept SGR sequences (those ending with 'm') */
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long elems[MAX_CSI_ELEMENTS];
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int nelems;
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for(nelems = 0; nelems<MAX_CSI_ELEMENTS; nelems++){
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p++;
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char *endptr;
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elems[nelems] = strtol(p, &endptr, 10);
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if(p == endptr){
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fprintf(stderr, "Invalid escape sequence: \"\\e%s\"\n", sequence_start);
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goto error;
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}
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p = endptr;
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if(*endptr == 'm')
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break;
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if(*endptr != ';'){
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fprintf(stderr, "Invalid escape sequence: \"\\e%s\"\n", sequence_start);
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goto error;
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}
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}
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p++; /* gobble up trailing 'm' of "\033[23;42m" */
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nelems++;
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/* By now we know it's a SGR since we error'ed out on anything else */
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if(nelems < 1){
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fprintf(stderr, "Unsupported escape sequence: \"\\e%s\"\n", sequence_start);
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goto error;
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}
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/* Parse the sequence numbers */
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for(int i=0; i<nelems; i++){
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switch(elems[i]){
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case 0: /* reset style */
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style.fg = colortable[DEFAULT_FG_COLOR];
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style.bg = colortable[DEFAULT_BG_COLOR];
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style.bold = 0;
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style.underline = 0;
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style.blink = 0;
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style.strikethrough = 0;
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style.fraktur = 0;
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style.invert = 0;
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break;
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case 1: /* bold */
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style.bold = 1;
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break;
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case 4: /* underline */
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style.underline = 1;
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break;
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case 5: /* slow blink */
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style.blink = 1;
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break;
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case 6: /* rapid blink */
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style.blink = 8;
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break;
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case 7: /* color invert on */
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style.invert = 1;
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break;
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case 9: /* strike-through */
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style.strikethrough = 1;
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break;
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case 20:/* Fraktur */
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style.fraktur = 1;
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break;
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case 22:/* Bold off */
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style.bold = 0;
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break;
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case 24:/* Underline off */
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style.underline = 0;
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break;
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case 25:/* Blink off */
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style.blink = 0;
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break;
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case 27:/* color invert off */
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style.invert = 0;
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break;
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case 29:/* strike-through off */
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style.strikethrough = 0;
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break;
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case 30: /* Set foreground color, "dim" colors */
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case 31:
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case 32:
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case 33:
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case 34:
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case 35:
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case 36:
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case 37:
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style.fg = colortable[elems[i]-30];
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break;
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case 38: /* Set xterm-256 foreground color */
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i++;
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if(nelems-i < 2 || elems[i] != 5){
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fprintf(stderr, "Invalid ANSI escape code: \"\\e%s\"\n", sequence_start);
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goto error;
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}
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style.fg = colortable[elems[++i]];
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break;
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case 39: /* Reset foreground color to default */
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style.bg = colortable[DEFAULT_FG_COLOR];
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break;
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case 40: /* Set background color, "dim" colors */
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case 41:
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case 42:
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case 43:
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case 44:
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case 45:
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case 46:
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case 47:
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style.bg = colortable[elems[i]-40];
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break;
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case 48: /* Set xterm-256 background color */
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i++;
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if(nelems-i < 2 || elems[i] != 5){
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fprintf(stderr, "Invalid ANSI escape code: \"\\e%s\"\n", sequence_start);
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goto error;
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}
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style.bg = colortable[elems[++i]];
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break;
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case 49: /* Reset background color to default */
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style.bg = colortable[DEFAULT_BG_COLOR];
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break;
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case 90: /* Set foreground color, "bright" colors */
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case 91:
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case 92:
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case 93:
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case 94:
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case 95:
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case 96:
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case 97:
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style.fg = colortable[elems[i]-90+8];
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break;
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case 100: /* Set background color, "bright" colors */
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case 101:
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case 102:
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case 103:
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case 104:
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case 105:
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case 106:
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case 107:
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style.bg = colortable[elems[i]-100+8];
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break;
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default:
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fprintf(stderr, "Unsupported escape sequence: \"\\e%s\"\n", sequence_start);
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goto error;
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}
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}
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}else{
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fprintf(stderr, "Unsupported escape sequence: \"\\e%s\"\n", sequence_start);
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goto error;
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}
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continue;
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}
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size_t inc = mbrtowc(&c, p, (s+len+1)-p, NULL);
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/* If p contained */
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if(inc == 0) /* Reached end of string */
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break;
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p += inc;
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/* Render glyph into frame buffer */
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struct timeb time = {0};
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ftime(&time);
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unsigned long int t = time.time*1000 + time.millitm;
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int blink = style.blink && (t % (1000/style.blink) < (333/style.blink));
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int inv = !(style.invert ^ blink);
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color_t fg = inv ? style.fg : style.bg;
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color_t bg = inv ? style.bg : style.fg;
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glyph_t *g = glyph_table->data[c];
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/* Is the glyph within the buffer's bounds? */
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if(x+g->width > offx && x < offx+gbufwidth){
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/* x-offx might be negative down to -g->width+1, but that's ok */
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render_glyph(g, gbuf, gbufwidth, x-offx, 0, fg, bg);
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if(style.strikethrough || style.underline){
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int sty = gbufheight/2;
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/* g->y usually is a negative index of the glyph's baseline measured from the glyph's bottom */
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int uly = gbufheight + g->y;
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for(int i=0; i<g->width; i++){
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if(x+i >= offx){ /* Stay within the frame buffer's bounds */
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if(style.strikethrough)
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gbuf[sty*gbufwidth + x + i - offx] = fg;
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if(style.underline)
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gbuf[uly*gbufwidth + x + i - offx] = fg;
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}
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}
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}
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}
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x += g->width;
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}
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return 0;
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error:
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return 1;
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}
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void console_render_buffer(color_t *data, size_t w, size_t h){
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/* Render framebuffer to terminal, two pixels per character using Unicode box drawing stuff */
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color_t lastfg = {0, 0, 0}, lastbg = {0, 0, 0};
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printf("\e[38;5;0;48;5;0m\e[K");
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for(size_t y=0; y < h; y+=2){
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for(size_t x=0; x < w; x++){
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/* Da magicks: ▀█▄ */
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color_t ct = data[y*w + x]; /* Top pixel */
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color_t cb = data[(y+1)*w + x]; /* Bottom pixel */
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/* The following, rather convoluted logic tries to "save" escape sequences when rendering. */
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if(!memcmp(&ct, &lastfg, sizeof(color_t))){
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if(!memcmp(&cb, &lastbg, sizeof(color_t))){
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printf("▀");
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}else if(!memcmp(&cb, &lastfg, sizeof(color_t))){
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printf("█");
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}else{
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printf("\033[48;5;%dm▀", xterm_color_index(cb));
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lastbg = cb;
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}
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}else if(!memcmp(&ct, &lastbg, sizeof(color_t))){
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if(!memcmp(&cb, &lastfg, sizeof(color_t))){
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printf("▄");
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}else if(!memcmp(&cb, &lastbg, sizeof(color_t))){
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printf(" ");
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}else{
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printf("\033[38;5;%dm▄", xterm_color_index(cb));
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lastfg = cb;
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}
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}else{ /* No matches for the upper pixel */
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if(!memcmp(&cb, &lastfg, sizeof(color_t))){
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printf("\033[48;5;%dm▄", xterm_color_index(ct));
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lastbg = ct;
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}else if(!memcmp(&cb, &lastbg, sizeof(color_t))){
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printf("\033[38;5;%dm▀", xterm_color_index(ct));
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lastfg = ct;
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}else{
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printf("\033[38;5;%d;48;5;%dm▀", xterm_color_index(ct), xterm_color_index(cb));
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lastfg = ct;
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lastbg = cb;
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}
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}
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}
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printf("\n\e[K");
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}
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printf("\033[0m");
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}
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