librpbyteswap is still embedded into libromdata and has exported
functions.
librpcpuid is a standalone static library and will be linked into
anything that needs CPU flags, instead of using __builtin_cpu_supports().
librpcpuid's version is more efficient because it has fewer tests and
it doesn't do string comparisons.
Remove #include "byteorder.h" from a few files, since it isn't actually used:
- librpbase/img/RpPng.cpp
- librpbase/img/RpPngWriter.cpp
- libromdata/disc/xdvdfs_structs.h
- libromdata/Media/hsfs_structs.h
[gtk,librpbase] Remove #include "librpcpu/cpu_dispatch.h" from stdafx.h,
since it's only used by a few files.
[gtk3] CMakeLists.txt: Removed SSSE3 checks. SSSE3 is only used by
GdkImageConv, which is only used by the XFCE (GTK2) UI frontend.
[gtk3] CairoImageConv.hpp: Remove #include "librpcpu/cpu_dispatch.h",
since it isn't actually used here.
[xfce] GdkImageConv_ifunc.cpp, [librpbyteswap] byteswap_ifunc.c:
- #include "config.librpcpuid.h" before checking for HAVE_IFUNC.
This was indirectly included before, but explicitly including it
allows us to skip the other inclusion if IFUNC is not available.
- Use le32_to_cpu() for the source data.
- Rearrange Pixel32 on BE.
Added non-intrinsic macros using byteorder.h. Can't easily add
intrinsic macros without CMake detection. (Might do that later.)
ImageDecoderTest BE failures before: 15
ImageDecoderTest BE failures after: 11
Main changes:
- Color A and Color B now share an opaque flag.
- Color B: The low bit of alpha is always 1, not 0.
- Tiles are stored in linear order, not Morton order.
To make it easier to support both formats with minimal changes, the
original PVRTC code has been changed to use templated functions.
Simple non-templated wrapper functions are provided for external use.
PowerVR3, KhronosKTX: Handle PVRTC-II. Note that there's no FourCC
defined for DDS, so we're not updating DirectDrawSurface.
TODO:
- The Hard transition flag isn't supported. PVRTexToolCLI didn't use the
hard transition flag when creating the test images.
[libromdata/tests] ImageDecoderTest: Added some PVRTC-II test images.
Based on tctest's example.png. Note that the PVRTC-II test images are
the full 512x512, whereas the PVRTC-I test image was 256x256.
We have our own ETC1 decompression code, which might be somewhat faster
than PowerVR's due to use of lookup tables. (Maybe I should benchmark
this later...)
It seems that the R and B channels are backwards, so we'll need to fix
that next. Other than that, both 2bpp and 4bpp decoding seems to work.
(A lot better than my terrible attempt, at least.)
[cmake] options.cmake: Added an option for PVRTC. The code is licensed
under the MIT license, but we might as well provide an option for it
because it's third-party code instead of my own code.
TODO:
- Fix R/B channel ordering.
- PVRTC-II decoding?
- Add PVRTC decoding to KTX and DDS.
