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sixel: hopefully handle image height correctly when trimming

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When trimming trailing empty rows from the final image, handle the RA
region correctly:

* If image is transparent, trim down to the last non-empty pixel row,
  regardless of whether it is inside or outside the RA region.

* If image is opaque, trim down to either the last non-empty pixel
  row, or the RA region, whatever is the largest height.
This commit is contained in:
Daniel Eklöf 2024-03-15 17:23:21 +01:00
parent cb820a498b
commit bce1d7313d
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GPG key ID: 5BBD4992C116573F
1 changed files with 16 additions and 4 deletions
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20
sixel.c
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@ -1148,11 +1148,23 @@ sixel_unhook(struct terminal *term)
*
* See https://raw.githubusercontent.com/hackerb9/vt340test/main/sixeltests/p2effect.sh
*/
if (term->sixel.pos.row + 6 * term->sixel.pan >= term->sixel.image.alloc_height &&
term->sixel.transparent_bg)
{
if (term->sixel.pos.row + 6 * term->sixel.pan >= term->sixel.image.alloc_height) {
LOG_DBG("trimming image");
term->sixel.image.height = term->sixel.image.alloc_height - rows_to_trim * term->sixel.pan;
const int trimmed_height =
term->sixel.image.alloc_height - rows_to_trim * term->sixel.pan;
if (term->sixel.transparent_bg) {
/* Image is transparent - trim as much as possible */
term->sixel.image.height = trimmed_height;
} else {
/* Image is opaque. We can't trim anything "inside"
the RA region */
if (trimmed_height > term->sixel.image.height) {
/* There are non-empty pixels *outside* the RA
region - trim up to that point */
term->sixel.image.height = trimmed_height;
}
}
} else {
LOG_DBG("only adjusting cursor position");
}