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.
Webp decode can only shrink-on-load to int boundaries. This means that frames
in an animation which only update part of the canvas can get displaced by
up to 0.5 pixels, causing juddering.
see https://github.com/libvips/libvips/issues/2379
* allow utf-8 header for svg detection
We were checking that the first 24 chars of an SVG were plain ASCII,
but that's not always the case, for example:
<svg id="レイヤー_1のコピー"
data-name="レイヤー 1のコピー"
xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 100 100">
</svg>
We now test for the string "<svg" being in the first 1000 bytes, and
everything up to that being valid utf-8.
See https://github.com/libvips/libvips/issues/2438
* raise priority of webpload
it was very low priority before, for some reason
switch GIF save to frame at a time
And make a new colormap if the frame average changes. This keeps memory use low, even for very large GIFs, though is somewhat slower.
See https://github.com/libvips/libvips/pull/2445
* Add jpeg restart_interval option.
This allows saving a jpeg with MCU restarts.
* Fix code style. Add description of restart_interval.
* Add a basic test based on output length.
* Update main change log.
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
We were looping over pages, cropping each one out, and saving.
Now there's a single loop for thw whole of the image, so things like
percent reporting work in the obvious way.
See https://github.com/libvips/libvips/issues/2450
* Ensure UBSan exits with a non-zero code on error
* Avoid misaligned member access in mosaic_fuzzer
* Add missing VIPS_CLIP in scRGB2sRGB/scRGB2BW
* Fix UBSan error in flatten
By using saturated casts for the int types (copied from vips_cast).
* CI: ensure fuzzer log is printed on error
* Avoid UB in heifload
* Revert flatten change
I could no longer reproduce this with clang 12 locally.
* Indentation fixes [skip ci]
Provides control over the maximum number of colours in the output
image palette, making the API more closely match that of pngsave.
Lowering the bitdepth to 7 (from the default value of 8), which
halves the maximum number of colours from 255 to 127, typically
reduces encoding time by ~20%.
John Cupitt
Lovell Fuller
David Manthey
Kleis Auke Wolthuizen
Joshua Sager
Lovell Fuller