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sixel: also set 'alloc_height', when short-cutting a resize operation

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In some cases, a sixel may be resized vertically, while still having a
zero-width. In this case, the resize operations are short-cutted, and
no actual allocations are done.

However, we forgot to set 'alloc_height' when doing so. As a result,
the trimming code (when the sixel is "done"), trimmed away the entire
sixel.
This commit is contained in:
Daniel Eklöf 2024-04-15 16:05:56 +02:00
parent 71ce17d977
commit 0ab05f4807
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GPG key ID: 5BBD4992C116573F
2 changed files with 8 additions and 2 deletions
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3
CHANGELOG.md
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@ -64,6 +64,9 @@
* Crash when printing double-width (or longer) characters to, or near,
the last column, when auto-wrap (private mode 7) has been disabled.
* Dynamically sized sixel being trimmed to nothing.
### Security
### Contributors

7
sixel.c
View file

@ -1400,7 +1400,7 @@ resize_horizontally(struct terminal *term, int new_width_mutable)
new_width_mutable = term->sixel.max_width;
}
if (unlikely(term->sixel.image.width == new_width_mutable))
if (unlikely(term->sixel.image.width >= new_width_mutable))
return;
const int sixel_row_height = 6 * term->sixel.pan;
@ -1414,6 +1414,7 @@ resize_horizontally(struct terminal *term, int new_width_mutable)
/* Lazy initialize height on first printed sixel */
xassert(old_width == 0);
term->sixel.image.height = height = sixel_row_height;
term->sixel.image.alloc_height = sixel_row_height;
} else
height = term->sixel.image.height;
@ -1423,6 +1424,7 @@ resize_horizontally(struct terminal *term, int new_width_mutable)
int alloc_height = (height + sixel_row_height - 1) / sixel_row_height * sixel_row_height;
xassert(new_width >= old_width);
xassert(new_width > 0);
xassert(alloc_height > 0);
@ -1474,6 +1476,7 @@ resize_vertically(struct terminal *term, const int new_height)
if (unlikely(width == 0)) {
xassert(term->sixel.image.data == NULL);
term->sixel.image.height = new_height;
term->sixel.image.alloc_height = alloc_height;
return true;
}
@ -1508,7 +1511,7 @@ resize(struct terminal *term, int new_width_mutable, int new_height_mutable)
{
LOG_DBG("resizing image: %dx%d -> %dx%d",
term->sixel.image.width, term->sixel.image.height,
new_width, new_height);
new_width_mutable, new_height_mutable);
if (unlikely(new_width_mutable > term->sixel.max_width)) {
LOG_WARN("maximum image width exceeded, truncating");