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792cde9879
This is a complete rewrite of the math in swscale/utils.c initFilter(), using
floating point math and with a bit more polished UI and internals. I have
also included a substantial number of improvements, including a method to
numerically compute the true filter support size from the parameters, and a
more robust logic for the edge conditions. The upshot of these changes is
that the filter weight computation is now much simpler and faster, and with
fewer edge cases.
I copy/pasted the actual underlying kernel functions from libplacebo, so this
math is already quite battle-tested. I made some adjustments to the defaults
to align with the existing defaults in libswscale, for backwards compatibility.
Note that this commit introduces a lot more filter kernels than what we
actually expose; but they are cheap to carry around, don't take up binary
space, and will probably save some poor soul from incorrectly reimplementing
them in the future. Plus, I have plans to expand the list of functions down
the line, so it makes sense to just define them all, even if we don't
necessarily use them yet.
Backported-from: 475b11b2e0
Since this depended on changes to the public swscale API, I have instead
added the necessary enums/defines to filters.h itself for now.
Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>
53 lines
2.5 KiB
Makefile
53 lines
2.5 KiB
Makefile
NAME = swscale
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DESC = FFmpeg image rescaling library
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HEADERS = swscale.h \
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version.h \
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version_major.h \
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OBJS = alphablend.o \
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cms.o \
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csputils.o \
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hscale.o \
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hscale_fast_bilinear.o \
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filters.o \
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format.o \
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gamma.o \
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graph.o \
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input.o \
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lut3d.o \
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options.o \
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output.o \
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rgb2rgb.o \
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slice.o \
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swscale.o \
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swscale_unscaled.o \
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utils.o \
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version.o \
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yuv2rgb.o \
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vscale.o \
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OBJS-$(CONFIG_UNSTABLE) += \
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ops.o \
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ops_backend.o \
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ops_chain.o \
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ops_dispatch.o \
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ops_memcpy.o \
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ops_optimizer.o \
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ifeq ($(CONFIG_UNSTABLE),yes)
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include $(SRC_PATH)/libswscale/vulkan/Makefile
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endif
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# Objects duplicated from other libraries for shared builds
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SHLIBOBJS += log2_tab.o half2float.o
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# Windows resource file
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SHLIBOBJS-$(HAVE_GNU_WINDRES) += swscaleres.o
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TESTPROGS = colorspace \
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floatimg_cmp \
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pixdesc_query \
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swscale \
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sws_ops \
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