remove sixel stub code

Remove stub code that was used for an experiment of adding sixel code to st
from the commit f7398434.

1 files changed, 5 insertions, 21 deletions

diff --git a/st.c b/st.c
index b5b805a..76b7e0d 100644
--- a/st.c
+++ b/st.c
@@ -51,7 +51,6 @@ enum term_mode {
         MODE_ECHO        = 1 << 4,
         MODE_PRINT       = 1 << 5,
         MODE_UTF8        = 1 << 6,
-        MODE_SIXEL       = 1 << 7,
 };
 
 enum cursor_movement {
@@ -78,12 +77,11 @@ enum charset {
 enum escape_state {
         ESC_START      = 1,
         ESC_CSI        = 2,
-        ESC_STR        = 4,  /* OSC, PM, APC */
+        ESC_STR        = 4,  /* DCS, OSC, PM, APC */
         ESC_ALTCHARSET = 8,
         ESC_STR_END    = 16, /* a final string was encountered */
         ESC_TEST       = 32, /* Enter in test mode */
         ESC_UTF8       = 64,
-        ESC_DCS        =128,
 };
 
 typedef struct {
@@ -2090,12 +2088,9 @@ tdectest(char c)
 void
 tstrsequence(uchar c)
 {
-        strreset();
-
         switch (c) {
         case 0x90:   /* DCS -- Device Control String */
                 c = 'P';
-                term.esc |= ESC_DCS;
                 break;
         case 0x9f:   /* APC -- Application Program Command */
                 c = '_';
@@ -2107,6 +2102,7 @@ tstrsequence(uchar c)
                 c = ']';
                 break;
         }
+        strreset();
         strescseq.type = c;
         term.esc |= ESC_STR;
 }
@@ -2304,7 +2300,7 @@ tputc(Rune u)
         Glyph *gp;
 
         control = ISCONTROL(u);
-        if (u < 127 || !IS_SET(MODE_UTF8 | MODE_SIXEL)) {
+        if (u < 127 || !IS_SET(MODE_UTF8)) {
                 c[0] = u;
                 width = len = 1;
         } else {
@@ -2325,23 +2321,11 @@ tputc(Rune u)
         if (term.esc & ESC_STR) {
                 if (u == '\a' || u == 030 || u == 032 || u == 033 ||
                    ISCONTROLC1(u)) {
-                        term.esc &= ~(ESC_START|ESC_STR|ESC_DCS);
-                        if (IS_SET(MODE_SIXEL)) {
-                                /* TODO: render sixel */;
-                                term.mode &= ~MODE_SIXEL;
-                                return;
-                        }
+                        term.esc &= ~(ESC_START|ESC_STR);
                         term.esc |= ESC_STR_END;
                         goto check_control_code;
                 }
 
-                if (IS_SET(MODE_SIXEL)) {
-                        /* TODO: implement sixel mode */
-                        return;
-                }
-                if (term.esc&ESC_DCS && strescseq.len == 0 && u == 'q')
-                        term.mode |= MODE_SIXEL;
-
                 if (strescseq.len+len >= strescseq.siz) {
                         /*
                          * Here is a bug in terminals. If the user never sends
@@ -2453,7 +2437,7 @@ twrite(const char *buf, int buflen, int show_ctrl)
         int n;
 
         for (n = 0; n < buflen; n += charsize) {
-                if (IS_SET(MODE_UTF8) && !IS_SET(MODE_SIXEL)) {
+                if (IS_SET(MODE_UTF8)) {
                         /* process a complete utf8 char */
                         charsize = utf8decode(buf + n, &u, buflen - n);
                         if (charsize == 0)