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Reworking sixel implementation based on veltza's implementation (#117)

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* sixel: remove black bars from sixel images

When the images don't fully cover the text cells, black bars are added
to them. This fix removes those bars, but if you need the old behavior,
you can restore it by setting 'sixelremovebars' to zero in config.h

* sixel: fix a potential memory leak

* sixel: improve behavior with text reflow

* sixel: prevent animated gifs from choking the terminal

Animated gifs constantly spawn new images that eventually choke the
terminal because the old animation frames are kept in the image buffer.
This fix removes overlapping images from the image buffer and prevents
them from piling up.

* sixel: add zooming and clipping

* sixel: copying bulk of changes

* sixel: move sixel_parser_parse() and add missing sequences and blocks (#113)

- Move sixel_parser_parse() from tputc() to twrite()
- Add missing 8452, DECSDM, XTSMGRAPHICS and XTWINOPS sequences
- Add more conditional blocks for the scrollback and sync patches
- Remove unused reflow_y from ImageList. It is only used for the
  scrollback-reflow patch in st-sx.

* sixel: update vtiden to VT200 family

* sixel: fix scrolling issues inside tmux (#114)

tmux is using the scrolling region and sequence to clear the screen
below the shell prompt. This peculiar behavior caused the tscrollup()
function to be called, which always scrolled the images regardless of
whether they were inside the region or not. So the images moved out of
place whenever the bottom of the screen was cleared. This fix checks
that the images are inside the region before scrolling them.

* sixel: prevent images from being deleted when resizing (#115)

This fixes resizing issues outside of tmux not inside.

* Rewriting tresize logic based on veltza's proposed implementation in PR #115

* tresize: correction for tscrollup call when scrollback patch is used

---------

Co-authored-by: veltza <106755522+veltza@users.noreply.github.com>
This commit is contained in:
Stein Gunnar Bakkeby 2024-03-07 09:22:44 +01:00 • committed by GitHub
parent 2e0e84d56a
commit 677c2da0be
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GPG key ID: B5690EEEBB952194
13 changed files with 790 additions and 321 deletions
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7
sixel.h
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@ -26,6 +26,7 @@ typedef enum parse_state {
PS_DECGRA = 3, /* DECGRA Set Raster Attributes " Pan; Pad; Ph; Pv */
PS_DECGRI = 4, /* DECGRI Graphics Repeat Introducer ! Pn Ch */
PS_DECGCI = 5, /* DECGCI Graphics Color Introducer # Pc; Pu; Px; Py; Pz */
PS_ERROR = 6,
} parse_state_t;
typedef struct parser_context {
@ -49,10 +50,12 @@ typedef struct parser_context {
sixel_image_t image;
} sixel_state_t;
void scroll_images(int n);
void delete_image(ImageList *im);
int sixel_parser_init(sixel_state_t *st, sixel_color_t fgcolor, sixel_color_t bgcolor, unsigned char use_private_register, int cell_width, int cell_height);
int sixel_parser_parse(sixel_state_t *st, unsigned char *p, size_t len);
int sixel_parser_parse(sixel_state_t *st, const unsigned char *p, size_t len);
int sixel_parser_set_default_color(sixel_state_t *st);
int sixel_parser_finalize(sixel_state_t *st, unsigned char **pixels);
int sixel_parser_finalize(sixel_state_t *st, ImageList **newimages, int cx, int cy, int cw, int ch);
void sixel_parser_deinit(sixel_state_t *st);
#endif