Similar to the change done in Corrade, see the commit for details:
878624ac36
Wow, this is probably the most backwards-compatibility code I've ever
written. Can't wait until I can drop all that.
The boring dry usage info grew significantly, and listing it as the
first thing on the page would scare people off. Put the examples first
instead, and for the imageconverter and sceneconverter add --info
listing examples, as that's what is eye-catchy.
Mirrors what's done in sceneconverter already. Use case is for example
resizing an image for a concrete mip level, then passing it through a
BC7 compressor, and finally exporting into a KTX2 container.
Counterpart to d07b6a2bb4, which did this
for sceneconverter (I should really do changes in both at the same
time). Additionally, it's not saying "uncompressed" for images anymore,
since it's more confusing than just saying nothing, especially when
block-compressed formats are involved.
Because the uncolored overly verbose output was ridicilously ugly and
hard to navigate for larger scenes. Like with TestSuite executables,
there's a --color option that defaults to automatic coloring based on
whether printing to a TTY and can be both explicitly enabled and
disabled.
Probably a leftover from when these dependencies were handled in a
much shittier way? For as long as I remember, enabling WITH_GL_INFO
always enabled WITH_GL and WITH_WINDOWLESSWHATEVERAPPLICATION
implicitly.
Similar to sceneconverter's --profile option, measuring import and
conversion time. This also means that sceneconverter's --profile now
includes image import time, which wasn't done before.
Originally I wanted to show how to convert a JPEG to an EXR directly,
however after trying and miserably failing to implement that inside
OpenExrImageConverter I realized the plugin is definitely not the place
where to perform such conversion. So this will have to wait until
there's some proper API in TextureTools or somewhere.
In case of --layers and --levels this only works if the input images
have a single level, otherwise --level has to be set. The internal
implementation would be too complex otherwise. As a consequence,
combining a set of 2D mipmapped images into a 3D mipmapped image means
one first has to combine particular 2D image levels to 3D levels and
then combine all 3D levels to a 3D mipmapped image, it can't be done in
a single step and it also can't be done by first combining levels and
then layers.
Minor but very important convenience feature, especially useful when
dealing with command-line apps. This now works:
magnum-imageconverter a.png a.jpg -c jpegQuality=0.75
The AnyImageConverter gets the jpegQuality option and then
automatically propagates it to the concrete plugin (which is either
JpegImageConverter or StbImageConverter), possibly warning in case the
target plugin doesn't recognize given option (i.e., doesn't list it in
its default configuration). Previously the user had to always specify a
concrete converter implementation using -C, which was rather annoying
and nonintuitive.
First and foremost I need to expand the interface to support 3D
image conversion. But the interface was not great to begin with, so this
takes the opportunity of an API break and does several things:
* The `export*()` names were rather strange and I don't even remember
why I chose that name (maybe because at first I wanted to have an
"exporter" API as a counterpart to importers?)
* In addition, there was no way to convert a compressed image to a
compressed image (or to an uncompressed image) and adding the two
missing variants would be a lot of combinations. So instead the new
convert() returns an ImageData, which can be both, and thus also
allows the converters to produce compressed or uncompressed output
based on some runtime setting, without having to implement two
(four?) separate functions for that and requiring users to know
beforehand what type of an image will be created.
* The ImageConverterFeature enum was named in a really strange way as
well, with ConvertCompressedImage meaning "convert to a compressed
image" while "ConvertCompressedData" instead meant "convert a
compressed image to a data". Utter chaos. It also all implied 2D and
on the other hand had a redundant `Image` in the name, so I went and
remade the whole thing. As mentioned above, two of the enums now mean
the same thing, and are both replaced with Convert2D.
* Finally, similarly as changes elsewhere, I took this opportunity to
get rid of std::string in the convertToFile() APIs.
There will be Flag::FlipY for images at some point, enabled by default
for compatibility with existing GL code, and so it makes sense to start
discouraging setFlags() as early as possible to avoid people resetting
the default by accident.
Also update the imageconverter, sceneconverter and shaderconverter utils
to use these instead of setFlags().
If it's ignored, a warning is printed to catch accidents, but not an
error since it should be possible to just append --info to existing
command line to see what the input is about.
Vladimír Vondruš