ant/st-flexipatch
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

sixel: improve the renderer (#143)

Browse source 
In the current implementation, when text is written over an image, we
have to cut the entire text line out of the image, regardless of how
long the text is. It doesn't look good, but it was a design choice for
the following reasons:
1) To keep the sixel engine as fast as possible
2) Most applications do not write text on the images anyway

To bring the st terminal in line with other terminals that support
sixels, I have now improved the sixel renderer so that the images can
now have gaps, which allows the text to be printed inside the images.
The changes should not affect performance in normal cases. Only when the
renderer has to deal with the text there might be some performance hits
depending on how many gaps there are in the images.
This commit is contained in:
veltza 2024-07-07 22:18:09 +03:00 • committed by GitHub
parent 48c85cdcf5
commit 7a581fe4e1
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
3 changed files with 61 additions and 47 deletions
Download patch file Download diff file Expand all files Collapse all files

15
st.c
View file

@ -2748,7 +2748,11 @@ strhandle(void)
} else {
term.images = newimages;
}
#if COLUMNS_PATCH && !REFLOW
x2 = MIN(x2, term.maxcol) - 1;
#else
x2 = MIN(x2, term.col) - 1;
#endif // COLUMNS_PATCH
if (IS_SET(MODE_SIXEL_SDM)) {
/* Sixel display mode: put the sixel in the upper left corner of
* the screen, disable scrolling (the sixel will be truncated if
@ -3521,7 +3525,7 @@ tresize(int col, int row)
#endif // COLUMNS_PATCH
int *bp;
#if SIXEL_PATCH
int x, x2;
int x2;
Line line;
ImageList *im, *next;
#endif // SIXEL_PATCH
@ -3628,8 +3632,7 @@ tresize(int col, int row)
}
#if SIXEL_PATCH
/* expand images into new text cells to prevent them from being deleted in
* xfinishdraw() that draws the images */
/* expand images into new text cells */
for (i = 0; i < 2; i++) {
for (im = term.images; im; im = next) {
next = im->next;
@ -3654,9 +3657,9 @@ tresize(int col, int row)
}
line = term.line[im->y];
#endif // SCROLLBACK_PATCH
x2 = MIN(im->x + im->cols, term.col);
for (x = im->x; x < x2; x++)
line[x].mode |= ATTR_SIXEL;
x2 = MIN(im->x + im->cols, col) - 1;
if (mincol < col && x2 >= mincol && im->x < col)
tsetsixelattr(line, MAX(im->x, mincol), x2);
}
tswapscreen();
}