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SIXEL image placement.

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This commit is contained in:
Nicholas Marriott
2026-10-13 22:43:16 +01:00
parent 6cebf96d9c
commit fbbecde236
4 changed files with 157 additions and 6 deletions
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39
image.c
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@@ -302,3 +302,42 @@ image_size_in_cells(u_int w, u_int h, u_int xpixel, u_int ypixel, u_int *sx,
*sx = w / xpixel + (w % xpixel != 0);
*sy = h / ypixel + (h % ypixel != 0);
}
/* Find area covered by a rectangle of cells in pixels. */
void
image_get_pixel_area(struct image *im, u_int x, u_int y, u_int w, u_int h,
u_int *px, u_int *py, u_int *pw, u_int *ph)
{
u_int left, top, right, bottom;
*px = *py = *pw = *ph = 0;
if (im == NULL || x >= im->sx || y >= im->sy || w == 0 || h == 0)
return;
if (w > im->sx - x)
w = im->sx - x;
if (h > im->sy - y)
h = im->sy - y;
left = (uint64_t)x * im->canvas_width / im->sx;
top = (uint64_t)y * im->canvas_height / im->sy;
right = ((uint64_t)(x + w) * im->canvas_width + im->sx - 1) / im->sx;
bottom = ((uint64_t)(y + h) * im->canvas_height + im->sy - 1) / im->sy;
if (left >= im->width || top >= im->height)
*px = *py = 0;
else {
if (right <= left)
right = left + 1;
if (bottom <= top)
bottom = top + 1;
if (right > im->width)
right = im->width;
if (bottom > im->height)
bottom = im->height;
*px = left;
*py = top;
*pw = right - left;
*ph = bottom - top;
}
}