sixel: change default max size to 10000x10000

It used to be the size of the window. This caused images to be cropped
when the application emitting them didn’t change the max size.

CHANGELOG.md

@@ -90,6 +90,8 @@ means foot can be PGO:d in e.g. sandboxed build scripts. See
   overflow into neighboring cells by default. Set
   **tweak.allow-overflowing-double-width-glyphs** to ‘no’ to disable
   this.
+* Sixel default maximum size is now 10000x10000 instead of the current
+  window size.
 
 
 ### Deprecated

pgo/pgo.c

@@ -13,6 +13,7 @@
 
 #include "async.h"
 #include "config.h"
+#include "sixel.h"
 #include "user-notification.h"
 #include "vt.h"
 
@@ -200,7 +201,12 @@ main(int argc, const char *const *argv)
         .delayed_render_timer = {
             .lower_fd = lower_fd,
             .upper_fd = upper_fd
-        }
+        },
+        .sixel = {
+            .palette_size = SIXEL_MAX_COLORS,
+            .max_width = SIXEL_MAX_WIDTH,
+            .max_height = SIXEL_MAX_HEIGHT,
+        },
     };
 
     tll_push_back(wayl.terms, &term);

sixel.c

@@ -778,24 +778,6 @@ sixel_unhook(struct terminal *term)
     render_refresh(term);
 }
 
-static unsigned
-max_width(const struct terminal *term)
-{
-    /* foot extension - treat 0 to mean current terminal size */
-    return term->sixel.max_width == 0
-        ? term->cols * term->cell_width
-        : term->sixel.max_width;
-}
-
-static unsigned
-max_height(const struct terminal *term)
-{
-    /* foot extension - treat 0 to mean current terminal size */
-    return term->sixel.max_height == 0
-        ? term->rows * term->cell_height
-        : term->sixel.max_height;
-}
-
 static bool
 resize(struct terminal *term, int new_width, int new_height)
 {
@@ -863,8 +845,8 @@ sixel_add(struct terminal *term, uint32_t color, uint8_t sixel)
 {
     //LOG_DBG("adding sixel %02hhx using color 0x%06x", sixel, color);
 
-    if (term->sixel.pos.col >= max_width(term) ||
+    if (term->sixel.pos.col >= term->sixel.max_width ||
-        term->sixel.pos.row * 6 + 5 >= max_height(term))
+        term->sixel.pos.row * 6 + 5 >= term->sixel.max_height)
     {
         return;
     }
@@ -990,7 +972,7 @@ decgra(struct terminal *term, uint8_t c)
                 pan, pad, pan / pad, ph, pv);
 
         if (ph >= term->sixel.image.height && pv >= term->sixel.image.width &&
-            ph <= max_height(term) && pv <= max_width(term))
+            ph <= term->sixel.max_height && pv <= term->sixel.max_width)
         {
             if (resize(term, ph, pv))
                 term->sixel.image.autosize = false;
@@ -1163,19 +1145,19 @@ sixel_geometry_report_current(struct terminal *term)
 {
     char reply[64];
     snprintf(reply, sizeof(reply), "\033[?2;0;%u;%uS",
-             max_width(term), max_height(term));
+             term->sixel.max_width, term->sixel.max_height);
     term_to_slave(term, reply, strlen(reply));
 
     LOG_DBG("query response for current sixel geometry: %ux%u",
-            max_width(term), max_height(term));
+            term->sixel.max_width, term->sixel.max_height);
 }
 
 void
 sixel_geometry_reset(struct terminal *term)
 {
-    LOG_DBG("sixel geometry reset to %ux%u", max_width(term), max_height(term));
+    LOG_DBG("sixel geometry reset to %ux%u", SIXEL_MAX_WIDTH, SIXEL_MAX_HEIGHT);
-    term->sixel.max_width = 0;
+    term->sixel.max_width = SIXEL_MAX_WIDTH;
-    term->sixel.max_height = 0;
+    term->sixel.max_height = SIXEL_MAX_HEIGHT;
     sixel_geometry_report_current(term);
 }
 

sixel.h

@@ -3,6 +3,8 @@
 #include "terminal.h"
 
 #define SIXEL_MAX_COLORS 1024u
+#define SIXEL_MAX_WIDTH 10000u
+#define SIXEL_MAX_HEIGHT 10000u
 
 void sixel_fini(struct terminal *term);
 

terminal.c

@@ -1109,6 +1109,8 @@ term_init(const struct config *conf, struct fdm *fdm, struct reaper *reaper,
         },
         .sixel = {
             .palette_size = SIXEL_MAX_COLORS,
+            .max_width = SIXEL_MAX_WIDTH,
+            .max_height = SIXEL_MAX_HEIGHT,
         },
         .hold_at_exit = conf->hold_at_exit,
         .shutdown_cb = shutdown_cb,