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

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This commit is contained in:
Nicholas Marriott
2019-12-05 08:32:25 +00:00
parent 49f2f0a8f1
commit 86c5098a88
3 changed files with 52 additions and 5 deletions
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16
sixel.c
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@ -350,11 +350,11 @@ sixel_size_in_cells(struct sixel_image *si, u_int *x, u_int *y)
struct sixel_image *
sixel_scale(struct sixel_image *si, u_int xpixel, u_int ypixel, u_int ox,
u_int oy, u_int sx, u_int sy)
u_int oy, u_int sx, u_int sy, int colours)
{
struct sixel_image *new;
u_int cx, cy, pox, poy, psx, psy, tsx, tsy, px, py;
u_int x, y;
u_int x, y, i;
/*
* We want to get the section of the image at ox,oy in image cells and
@ -372,6 +372,11 @@ sixel_scale(struct sixel_image *si, u_int xpixel, u_int ypixel, u_int ox,
if (oy + sy >= cy)
sy = cy - oy;
if (xpixel == 0)
xpixel = si->xpixel;
if (ypixel == 0)
ypixel = si->ypixel;
pox = ox * si->xpixel;
poy = oy * si->ypixel;
psx = sx * si->xpixel;
@ -391,6 +396,13 @@ sixel_scale(struct sixel_image *si, u_int xpixel, u_int ypixel, u_int ox,
sixel_set_pixel(new, x, y, sixel_get_pixel(si, px, py));
}
}
if (colours) {
new->colours = xmalloc(si->ncolours * sizeof *new->colours);
for (i = 0; i < si->ncolours; i++)
new->colours[i] = si->colours[i];
new->ncolours = si->ncolours;
}
return (new);
}