- transparency was broken if image had no extension block
- load image to memory, test for transparency and mono/colour, write 1,
2, 3, or 4 band image to output, depending on what we found
getting --fail on jpegload working means tilecache must terminate on tile
calc error
make openslideload not report tile calc errors, it might need a --fail
option too
see https://github.com/jcupitt/libvips/issues/474
vips_resize() uses to just use nearest when upsizing, following standard
practice in repro. This is often unfortunate for image processing, where
small nearest upsizes will produce obvious aliasing.
It now picks a VipsInterpolate which corresponds (roughly) to the
selected VipsKernel and uses that with affine for any upsizing.
vips_resize() used to do most of a downsize with vips_shrink() and the
final 200 - 300% with vips_reduce(). This was correct for lanczos2/3,
but not right for linear/cubic, which need more shrink and less
reduce to avoid aliasing.
This patch makes vips_resize() leave the final 100 - 200% to
vips_reduce() for linear/cubic, and leave everything to reduce for
nearest.
oops, it was missing
also, change the return type from void to VImage. This makes chaining
possible, eg.:
VImage memory = im.write( Viameg::new_memory() );
when you write to a non-partial image, you create a sink ... so
vips_image_write() only needs to ref the input when writing to partials
this change makes it much easier to (for example) combine many images in
bounded space, see for example:
https://gist.github.com/jcupitt/c516325ebef7601b5da610af5619c9b2
- rename compression_level as deflate_level to match libgsf convention
- use libgsf enums for GSF_ZIP_STORED, etc.
- configure-time checks for zip64 and deflate-level
- off-topic: rename NEED_TYPE_INIT as HAVE_TYPE_INIT for consistency
