Merge SIXEL branch.

Squashed commit of the following:

commit 6ebc3feb4671d9b25b3db99d3c16b2323b8e3d02
Author: topcat001 <anindya49@hotmail.com>
Date:   Sun Aug 20 16:09:51 2023 -0700

    Remove redundant {}.

commit 6f013fce39602c259a5be2d690d548c73e51cccc
Author: topcat001 <anindya49@hotmail.com>
Date:   Sun Aug 20 16:02:15 2023 -0700

    Revert "Do not defer redraw if it is just the status line (will need to do more here I"

    This reverts commit 0a15bbf3f1972dc84c5c84d5128024c1bc4c0074.

commit e6322b4196d73c975ba2e73633e6de9c46779059
Author: topcat001 <anindya49@hotmail.com>
Date:   Sun Aug 20 15:46:59 2023 -0700

    Fix placeholder label and clean up.

commit 5896ac52a1f72056a75480b3e1ada328f239df9b
Merge: ad982330 e3a8b843
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Fri Aug 18 17:00:03 2023 +0100

    Merge branch 'master' into sixel

commit ad98233066b72547aee7fa0c87838847ee7f1ece
Author: topcat001 <anindya49@hotmail.com>
Date:   Tue Aug 15 13:57:08 2023 -0700

    Better text placeholder.

commit 312d83252c27fc4d09d09d121bf7573336e3cdca
Merge: 14b8b524 3d93b0c5
Author: topcat001 <anindya49@hotmail.com>
Date:   Tue Aug 15 13:39:22 2023 -0700

    Merge remote-tracking branch 'origin/master' into sixel

commit 14b8b524523a7d5a4e42f7dfa346905c604c91e2
Merge: 4baf7642 fda39377
Author: topcat001 <anindya49@hotmail.com>
Date:   Sat Jul 22 17:29:10 2023 -0700

    Merge branch 'master' into sixel

commit 4baf76422fadb216bf27b47645b52da3379e7dea
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Wed Jun 21 07:43:53 2023 +0100

    Both files can go on one line.

commit 4c92acf6ff24dde37ad41cd168ea2d3bcefb8567
Author: topcat001 <anindya49@hotmail.com>
Date:   Sat Jun 17 17:53:01 2023 -0700

    Merge topcat001/tmux/sixel.

commit 6794facc82e98f8448c192913cf62fe6e10fde63
Merge: 7b85f5ad f41c536f
Author: topcat001 <anindya49@hotmail.com>
Date:   Sat Jun 17 17:21:02 2023 -0700

    Merge remote-tracking branch 'origin/master' into sixel

commit 7b85f5adf9a5094db580ca98e4d2231d8d5b5a4f
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Jun 8 12:55:03 2023 +0100

    Do not require passthrough for SIXEL.

commit a6ee55e0925cac35d011c188db2da0421fc09be1
Merge: 6da391f4 fe385b18
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Jun 8 12:19:55 2023 +0100

    Merge branch 'master' into sixel

commit 6da391f460414ed3dde23e5ab6ca3fe8e988ce51
Merge: 0d71e585 0eb5d254
Author: topcat001 <anindya49@hotmail.com>
Date:   Sat May 20 17:05:55 2023 -0700

    Merge branch 'master' into sixel

commit 0d71e5853ffe797f90b815ac3af25ac0ad92ab07
Merge: 64368a1a fbe6fe7f
Author: topcat001 <anindya49@hotmail.com>
Date:   Sat Apr 29 17:32:07 2023 -0700

    Merge branch 'master' into sixel

commit 64368a1a63f04fb877b57e4286c9a2e1efe966c9
Merge: c630a56a 22eb0334
Author: topcat001 <anindya49@hotmail.com>
Date:   Thu Mar 30 14:21:09 2023 -0700

    Merge branch 'master' into sixel

commit c630a56a621b9761eed558cbd566a36cb09adf8f
Merge: 34c96c4c aaa043a2
Author: topcat001 <anindya49@hotmail.com>
Date:   Thu Nov 10 18:53:01 2022 -0800

    Merge branch 'master' into sixel

commit 34c96c4c4a33f86b49c8a53dc48b2b817db24e95
Merge: 2a1e16a2 50f4e0fa
Author: topcat001 <anindya49@hotmail.com>
Date:   Sat Nov 5 18:05:36 2022 -0700

    Merge branch 'master' into sixel

commit 2a1e16a24dc75741c66f5d72fa5bf26b73507993
Merge: a82f14c7 d001a94d
Author: topcat001 <anindya49@hotmail.com>
Date:   Thu Oct 27 16:01:35 2022 -0700

    Merge branch 'master' into sixel

commit a82f14c7b23a239a2114c756ef73bba8609ebe33
Merge: 742c0634 f7b30ed3
Author: topcat001 <anindya49@hotmail.com>
Date:   Sun Aug 28 13:43:07 2022 -0700

    Merge branch 'master' into sixel

commit 742c0634734e6b2840762e58b0bf27626b5ac24b
Merge: 906c92a5 87b248f3
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Fri Apr 1 10:14:15 2022 +0100

    Merge branch 'master' into sixel

commit 906c92a5f458b8843e7abd1d6f419dc091f8063c
Merge: 6680a024 138ffc7c
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Wed Dec 8 10:37:33 2021 +0000

    Merge branch 'master' into sixel

commit 6680a024be5e173a27c10e9a0be6c9072576086d
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Oct 7 13:59:08 2021 +0100

    Fix build.

commit ebd2c585937f18045d334226d4a0cc788fe14353
Merge: 90dc0519 fed7b29c
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Oct 7 13:19:48 2021 +0100

    Merge branch 'master' into sixel

commit 90dc05191cbba8de6d9d77ee7f9726325abe844e
Merge: a282439f 4694afbe
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Feb 20 20:37:32 2020 +0000

    Merge branch 'master' into sixel

commit a282439fcb2f597927a5ba33d2c378c90eec8b42
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Jan 30 09:12:53 2020 +0000

    Add missing declarations.

commit 3a741aacd108538f99239c68bfa2cd416bf0eb46
Merge: 40ad0107 339832b9
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Jan 30 09:11:01 2020 +0000

    Merge branch 'sixel-passthrough' into sixel

commit 339832b92c298538f398754f6d3fc21d15d13326
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Jan 30 09:04:51 2020 +0000

    Bad merge.

commit 92ed9fc0b20440f2bc553757e6bfe3126fe84be4
Merge: 5bb07548 32be954b
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Jan 30 09:03:38 2020 +0000

    Merge branch 'master' into sixel-passthrough

commit 40ad01073d73a531b4e85b0138f78bf0b472b354
Merge: dd3c72f1 61b075a2
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Sun Jan 12 20:03:41 2020 +0000

    Merge branch 'master' into sixel

commit 5bb075487f5897d7402adb880e678043c0f7f3e0
Merge: 7c033a74 54efe337
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Wed Dec 18 20:24:42 2019 +0000

    Merge branch 'master' into sixel-passthrough

commit dd3c72f132c911b0ba61b56a56f46510704d3392
Merge: 1a0e5fe9 54efe337
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Wed Dec 18 20:24:26 2019 +0000

    Merge branch 'master' into sixel

commit 1a0e5fe933e89932f2f658936c52eb50644fbef4
Merge: cf071ffe 15d7e564
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Tue Dec 10 16:34:11 2019 +0000

    Merge branch 'master' into sixel

commit cf071ffecd5a0d33008fd0a8b66a22f6855c7a8d
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Mon Dec 9 15:41:56 2019 +0000

    Remove images when reflow happens.

commit 2006b7a5631787a7086c6bae364e62d0a0b5948a
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Dec 5 09:27:15 2019 +0000

    More invalidation of images.

commit b642eac4503cc89cde01103f7bacca57cc9c1a2b
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Dec 5 09:11:24 2019 +0000

    Redraw and scroll images and part of invalidating them.

commit 7566e37a461bf245bd2e54e1d522e919071e9c44
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Dec 5 08:51:24 2019 +0000

    Call sixel_scale with the right number of arguments.

commit 62c0280b23cf67fc43f691392a8eca5cd7ff0727
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Dec 5 08:48:58 2019 +0000

    Correctly remove when not visible.

commit 86c5098a887f2cd09b828e051ccf0fab21bf4f6a
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Dec 5 08:32:25 2019 +0000

    Add helpers to scroll image up and a flag to copy the colours.

commit 49f2f0a8f1e72389f4128aa38119ed124cdc31c5
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Dec 5 00:02:55 2019 +0000

    Store images, currently at most 10.

commit 3aebcc67099ccbc5964c744fc1435931c1a78583
Merge: 146ee3f6 92ecd611
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Wed Dec 4 19:27:16 2019 +0000

    Merge branch 'master' into sixel

commit 7c033a74e25957d333217cb71a7658b860583501
Merge: 0a15bbf3 92ecd611
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Wed Dec 4 12:41:09 2019 +0000

    Merge branch 'master' into sixel-passthrough

commit 146ee3f6f8ee2629c6a88b6900a71f3e6fd14e4d
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Sat Nov 30 09:47:53 2019 +0000

    Don't write image as text yet.

commit 0a15bbf3f1972dc84c5c84d5128024c1bc4c0074
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Sat Nov 30 09:15:35 2019 +0000

    Do not defer redraw if it is just the status line (will need to do more here I
    think).

commit a5b1e209417b7d3f5b0099642dd317c312f79377
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Nov 28 14:20:22 2019 +0000

    Add a flag to disable blocking while sending a SIXEL image (turned off when the
    buffer hits 0 size).

commit 968382aa6a4b9c71fbc221aa4f0e899f6a83a260
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Nov 28 12:35:18 2019 +0000

    Pass through SIXEL DCS sequences (treat similarly to the passthrough escape
    sequence) if it appears the terminal outside supports them.

commit b1904c9b8db514133d3372aac13b2ff0b2093cc3
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Sat Nov 30 09:17:18 2019 +0000

    Store SIXELs as a box for the moment.

commit 5d8dbcdf3d76d0e69b8f2d21eff48f819dcec199
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Sat Nov 30 09:15:35 2019 +0000

    Do not defer redraw if it is just the status line (will need to do more here I
    think).

commit 0c999a402ece7b40e6ae84547893421b52d508ff
Merge: 28961dd5 866b053f
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Fri Nov 29 18:54:09 2019 +0000

    Merge branch 'master' into sixel

commit 28961dd5a38dd5a7b703ed0e6625fa9a65556d35
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Nov 28 14:24:57 2019 +0000

    Add an image.

commit d2e3f3c1cca5410570c5392340d14e96ae7a354c
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Nov 28 14:20:22 2019 +0000

    Add a flag to disable blocking while sending a SIXEL image (turned off when the
    buffer hits 0 size).

commit e01df67ca106e57f5c689e75f313f8cda6f8b805
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Nov 28 13:21:40 2019 +0000

    Crop and scale images as needed when drawing them.

commit e24acc0b5c3ac19dcacebdea243dcc7784215ffa
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Nov 28 12:38:02 2019 +0000

    Simple SIXEL parse and modify API.

commit b34111b3da1e4b1769a976cd40486144f7b4f5a2
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date:   Thu Nov 28 12:35:18 2019 +0000

    Pass through SIXEL DCS sequences (treat similarly to the passthrough escape
    sequence) if it appears the terminal outside supports them.

1 files changed, 64 insertions, 0 deletions

diff --git a/tmux.h b/tmux.h
index 88c5f953..444373cb 100644
--- a/tmux.h
+++ b/tmux.h
@@ -64,6 +64,11 @@ struct screen_write_citem;
 struct screen_write_cline;
 struct screen_write_ctx;
 struct session;
+
+#ifdef ENABLE_SIXEL
+struct sixel_image;
+#endif
+
 struct tty_ctx;
 struct tty_code;
 struct tty_key;
@@ -839,6 +844,24 @@ struct style {
 	enum style_default_type	default_type;
 };
 
+#ifdef ENABLE_SIXEL
+/* Image. */
+struct image {
+	struct screen		*s;
+	struct sixel_image	*data;
+	char			*fallback;
+
+	u_int			 px;
+	u_int			 py;
+	u_int			 sx;
+	u_int			 sy;
+
+	TAILQ_ENTRY (image)	 all_entry;
+	TAILQ_ENTRY (image)	 entry;
+};
+TAILQ_HEAD(images, image);
+#endif
+
 /* Cursor style. */
 enum screen_cursor_style {
 	SCREEN_CURSOR_DEFAULT,
@@ -880,6 +903,10 @@ struct screen {
 	bitstr_t			*tabs;
 	struct screen_sel		*sel;
 
+#ifdef ENABLE_SIXEL
+	struct images			 images;
+#endif
+
 	struct screen_write_cline	*write_list;
 
 	struct hyperlinks		*hyperlinks;
@@ -1382,6 +1409,7 @@ struct tty {
 
 	u_int		 sx;
 	u_int		 sy;
+        /* Cell size in pixels. */
 	u_int		 xpixel;
 	u_int		 ypixel;
 
@@ -1390,6 +1418,8 @@ struct tty {
 	enum screen_cursor_style cstyle;
 	int		 ccolour;
 
+        /* Properties of the area being drawn on. */
+        /* When true, the drawing area is bigger than the terminal. */
 	int		 oflag;
 	u_int		 oox;
 	u_int		 ooy;
@@ -2332,6 +2362,11 @@ void	tty_set_path(struct tty *, const char *);
 void	tty_update_mode(struct tty *, int, struct screen *);
 void	tty_draw_line(struct tty *, struct screen *, u_int, u_int, u_int,
 	    u_int, u_int, const struct grid_cell *, struct colour_palette *);
+
+#ifdef ENABLE_SIXEL
+void	tty_draw_images(struct client *, struct window_pane *, struct screen *);
+#endif
+
 void	tty_sync_start(struct tty *);
 void	tty_sync_end(struct tty *);
 int	tty_open(struct tty *, char **);
@@ -2362,6 +2397,11 @@ void	tty_cmd_scrolldown(struct tty *, const struct tty_ctx *);
 void	tty_cmd_reverseindex(struct tty *, const struct tty_ctx *);
 void	tty_cmd_setselection(struct tty *, const struct tty_ctx *);
 void	tty_cmd_rawstring(struct tty *, const struct tty_ctx *);
+
+#ifdef ENABLE_SIXEL
+void	tty_cmd_sixelimage(struct tty *, const struct tty_ctx *);
+#endif
+
 void	tty_cmd_syncstart(struct tty *, const struct tty_ctx *);
 void	tty_default_colours(struct grid_cell *, struct window_pane *);
 
@@ -2946,6 +2986,10 @@ void	 screen_write_setselection(struct screen_write_ctx *, const char *,
 	     u_char *, u_int);
 void	 screen_write_rawstring(struct screen_write_ctx *, u_char *, u_int,
 	     int);
+#ifdef ENABLE_SIXEL
+void	 screen_write_sixelimage(struct screen_write_ctx *,
+	     struct sixel_image *, u_int);
+#endif
 void	 screen_write_alternateon(struct screen_write_ctx *,
 	     struct grid_cell *, int);
 void	 screen_write_alternateoff(struct screen_write_ctx *,
@@ -3365,6 +3409,26 @@ struct window_pane *spawn_pane(struct spawn_context *, char **);
 /* regsub.c */
 char		*regsub(const char *, const char *, const char *, int);
 
+#ifdef ENABLE_SIXEL
+/* image.c */
+int		 image_free_all(struct screen *);
+struct image	*image_store(struct screen *, struct sixel_image *);
+int		 image_check_line(struct screen *, u_int, u_int);
+int		 image_check_area(struct screen *, u_int, u_int, u_int, u_int);
+int		 image_scroll_up(struct screen *, u_int);
+
+/* image-sixel.c */
+struct sixel_image *sixel_parse(const char *, size_t, u_int, u_int);
+void		 sixel_free(struct sixel_image *);
+void		 sixel_log(struct sixel_image *);
+void		 sixel_size_in_cells(struct sixel_image *, u_int *, u_int *);
+struct sixel_image *sixel_scale(struct sixel_image *, u_int, u_int, u_int,
+		     u_int, u_int, u_int, int);
+char		*sixel_print(struct sixel_image *, struct sixel_image *,
+		     size_t *);
+struct screen	*sixel_to_screen(struct sixel_image *);
+#endif
+
 /* server-acl.c */
 void			 server_acl_init(void);
 struct server_acl_user	*server_acl_user_find(uid_t);