oops, was not typing parent_class correctly

ooops, forgot

we had an error in the docy bits of c++

and add some checks that the load subclasses have been defined
correctly

plus small openslideload_source fixes

Switch VIPS_FCLIP to VIPS_CLIP in vips_scRGB2{BW,sRGB}

Exclude libpng load when building with libspng

Remove redundant -lstdc++ configure check

This became unused after commit 346a9e7.

Similar to ce63fc1, but allowing libpng to be configured with
-DPNG_NO_READ (i.e reading functio...

we were only warning on EOF in the read stub, even if fail was set

thanks bozaro

see https://g...

This is a source which wraps a GInputStream. You can use this to eg.
efficiently load a PNG file...

- ppmload was not setting interpretation, filename, etc. for files read via
mmap
- files not r...

and fix an assert fail with debugging enabled on recent libheif

if you built heifload with DEBUG it could ask for bpp for channels
which do not exist, triggerin...

revert to the 20.04 libheif/libde265/etc. packages, since we get the test
suite to pass with them

also needed by libheif.pc

libaom-dev is required by libheif-dev, but not listed as a dependency

perhaps we need to update after adding the ppas

seems their ubuntu is missing this

switching away from travis

and fix changelog dates

see https://github.com/libvips/libvips/pull/1938

Avoid seeking on bad file descriptors

Since subclasses could override the seek method without setting the file descriptor.

webpload: prevent divide-by-zero when blending pixels

Adds a test case to prevent regression - see commit 6eaf1ed

with a dropped patch from 8.10.3

This patch was dropped from 8.10.3 release 1, annoyingly.

it was being rewritten by the export script

see https://github.com/libvips/libvips/issues/1928

see https://github.com/libvips/libvips/pull/1921

fixes #1901

Resolve rounding issues in reduce

see https://github.com/libvips/libvips/pull/1921

fix heif load fails with 0 length metadata

Fix two bugs:

- clip in casts from int32 and uint32 could overflow -- do these as gint64 now

-...

fixes #1901

see https://github.com/libvips/libvips/pull/1918

webpload: ensure first frame is not blended

ppm strip dropped magic number

ppmload_source was missing an ia_a test

see https://github.com/libvips/libvips/issues/1915

see https://github.com/libvips/libvips/issues/1913

https://github.com/libvips/libvips/issues/1912

with an uglu gcc progma

We used to enable write to stdout if the first character of an output filename
was ".", eg.:

v...

stdin / stdout (for example) are created in text mode by default on
win. We need to flip them to...

Ensure vipsload only byte swaps if necessary

Prior to this commit, MSB-ordered vips images were always byte swapped
on both little- and big e...