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sixel: improve the renderer (#143)

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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
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3 changed files with 61 additions and 47 deletions
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78
x.c
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@ -3167,9 +3167,14 @@ xfinishdraw(void)
ImageList *im, *next;
Imlib_Image origin, scaled;
XGCValues gcvalues;
GC gc;
GC gc = NULL;
int width, height;
int x, x2, del, destx, desty;
int del, desty, mode, x1, x2, xend;
#if ANYSIZE_PATCH
int bw = win.hborderpx, bh = win.vborderpx;
#else
int bw = borderpx, bh = borderpx;
#endif // ANYSIZE_PATCH
Line line;
#endif // SIXEL_PATCH
@ -3260,43 +3265,50 @@ xfinishdraw(void)
}
}
/* clip the image so it does not go over to borders */
x2 = MIN(im->x + im->cols, term.col);
width = MIN(width, (x2 - im->x) * win.cw);
/* delete the image if the text cells behind it have been changed */
#if SCROLLBACK_PATCH || REFLOW_PATCH
line = TLINE(im->y);
#else
line = term.line[im->y];
#endif // SCROLLBACK_PATCH | REFLOW_PATCH
for (del = 0, x = im->x; x < x2; x++) {
if ((del = !(line[x].mode & ATTR_SIXEL)))
break;
}
if (del) {
delete_image(im);
continue;
/* create GC */
if (!gc) {
memset(&gcvalues, 0, sizeof(gcvalues));
gcvalues.graphics_exposures = False;
gc = XCreateGC(xw.dpy, xw.win, GCGraphicsExposures, &gcvalues);
}
/* draw the image */
memset(&gcvalues, 0, sizeof(gcvalues));
gcvalues.graphics_exposures = False;
gc = XCreateGC(xw.dpy, xw.win, GCGraphicsExposures, &gcvalues);
#if ANYSIZE_PATCH
destx = win.hborderpx + im->x * win.cw;
desty = win.vborderpx + im->y * win.ch;
#else
destx = borderpx + im->x * win.cw;
desty = borderpx + im->y * win.ch;
#endif // ANYSIZE_PATCH
/* set the clip mask */
desty = bh + im->y * win.ch;
if (im->clipmask) {
XSetClipMask(xw.dpy, gc, (Drawable)im->clipmask);
XSetClipOrigin(xw.dpy, gc, destx, desty);
XSetClipOrigin(xw.dpy, gc, bw + im->x * win.cw, desty);
}
XCopyArea(xw.dpy, (Drawable)im->pixmap, xw.buf, gc, 0, 0, width, height, destx, desty);
XFreeGC(xw.dpy, gc);
/* draw only the parts of the image that are not erased */
#if SCROLLBACK_PATCH || REFLOW_PATCH
line = TLINE(im->y) + im->x;
#else
line = term.line[im->y] + im->x;
#endif // SCROLLBACK_PATCH || REFLOW_PATCH
xend = MIN(im->x + im->cols, term.col);
for (del = 1, x1 = im->x; x1 < xend; x1 = x2) {
mode = line->mode & ATTR_SIXEL;
for (x2 = x1 + 1; x2 < xend; x2++) {
if (((++line)->mode & ATTR_SIXEL) != mode)
break;
}
if (mode) {
XCopyArea(xw.dpy, (Drawable)im->pixmap, xw.buf, gc,
(x1 - im->x) * win.cw, 0,
MIN((x2 - x1) * win.cw, width - (x1 - im->x) * win.cw), height,
bw + x1 * win.cw, desty);
del = 0;
}
}
if (im->clipmask)
XSetClipMask(xw.dpy, gc, None);
/* if all the parts are erased, we can delete the entire image */
if (del && im->x + im->cols <= term.col)
delete_image(im);
}
if (gc)
XFreeGC(xw.dpy, gc);
#endif // SIXEL_PATCH
#if !SINGLE_DRAWABLE_BUFFER_PATCH