* libnsgif: Delete patch for read only source data.
The source data is now read only in upstream libnsgif and the code
has changed quite a bit so this does not apply.
* libnsgif: Update to latest upstream master.
* libnsgif: Only one insufficient data return code now.
There is only one code now, for "I need more data".
* libnsgif: Update for renamed structure member.
When we image_new_from_source, the source object has some of the loader
state: it tracks the current read position of the load library. This
means that we mustn't keep source loaders in the operation cache, since
a second call could give a different result because the source object
read position might have changed.
Also: add a rewind to get_flags_source in spngload, and jp2k needs to
tag its load region as having no thread ownership or you'll get assert
fails in the test suite with debug enabled.
This patch makes "insert" issue minimise signals for inputs in sequential
mode. This can drop memory use in some programs, for example:
```python
import sys
import random
import pyvips
image = pyvips.Image.black(20000, 20000)
for filename in sys.argv[2:]:
tile = pyvips.Image.new_from_file(filename, access='sequential')
x = random.randint(0, image.width - tile.width)
y = random.randint(0, image.height - tile.height)
image = image.insert(tile, x, y)
image.write_to_file(sys.argv[1])
```
Before this patch:
```
$ for i in {0..1000}; do cp ~/pics/k2.jpg $i.jpg; done
$ /usr/bin/time -f %M:%e ../manyjoin.py ../x.jpg *.jpg
5456256:4.34
```
With this patch:
```
$ /usr/bin/time -f %M:%e ../manyjoin.py ../x.jpg *.jpg
2475324:3.38
```
This patch makes arrayjoin leave a bigger margin off the end of each
input image. This can help some loaders which have large output caches.
See https://github.com/libvips/libvips/issues/2440
Instead of a simple fail/don't-fail boolean switch, add fail-on, an enum which sets the sensitivity of loaders to errors.
There's a new sensitivity level which tries to detect truncated images, but ignores other types of error.
Kleis Auke Wolthuizen
John Cupitt
Remi Collet
Sergey Alexandrovich
Michael Drake
Moggers
Lovell Fuller
Heshy Roskes