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.
tell buffer and target savers the file format
Currently, buffer and target savers are not told the format they should
write.
This is usually OK (the JPEG saver already knows it should write JPEG),
but some savers can write several formats, and these currently need an
extra parameter.
For example:
```ruby
buf = x.write_to_buffer ".bmp", format: "bmp"
```
The first ".bmp" gets libvips to pick magicksave, the second
`format:` param is necessary to tell magicksave to write BMP.
This patch adds stub subclasses so that the savers know the exact format. It also improves PPM save.
The filemode ifdefs had grown to 30 lines of code duplicated in four
source files. Move to a single copy in a private header (not part of the
public API).
We used to assume (in several places) that any source with a filename was
seekable. This patch adds a is_file test, and makes all the loaders use it.
see https://github.com/libvips/libvips/issues/2467
* fic gtk-doc typenames in cgif
* fix flatten clipping
flatten could produce out of range values if max_alpha was less than
the limit of the numeric range of the format
https://github.com/libvips/libvips/issues/2431
Since threads on Windows can be terminated prior to the execution
of the atexit registered functions (i.e. vips_shutdown), causing
a surprising deadlock. This thread is never recycled, so it should
be fine.
Reverts commit d1b4d12388 partially.
Since threads can be reused, we need to free the
calculated pixel buffer cache early (i.e. during
vips_thread_shutdown).
This (partially) reverts commit 1a915db.
Defaults to no subsampling when Q>90 for consistency with jpegsave.
Deprecate VipsForeignJpegSubsample enum, replace with more generic
VipsForeignSubsample.
There were a few issues in VipsSource around seeking on pipes. With this
patch, EOF detection is better, and pipe sources automatically turn into memory
sources when EOF is hit.
see https://github.com/libvips/libvips/issues/1829
John Cupitt
Kleis Auke Wolthuizen
Lovell Fuller
Adil Benameur
Keim, Stefan
Lovell Fuller