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	Add mod to blind-arithm - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	commit c91c5cb8e892f1c19c970cef033cc03c9f47f98a
	parent b3042abffb9f4e4c7edd16934af99716bcdc2901
	Author: Mattias Andrée <[email protected]>
	Date: Sun, 2 Jul 2017 17:30:22 +0200

	Add mod to blind-arithm

	Signed-off-by: Mattias Andrée <[email protected]>

	Diffstat:
	M man/blind-arithm.1 \| 4 ++++
	M src/blind-arithm.c \| 1 +
	M src/video-math.h \| 16 ++++++++++++++++

	3 files changed, 21 insertions(+), 0 deletions(-)
	---
	diff --git a/man/blind-arithm.1 b/man/blind-arithm.1
	@@ -41,6 +41,10 @@ Calculate the product of the operands.
	.B div
	Divide the left-hand operand by the right-hand operand.
	.TP
	+.B mod
	+Calculate the modulus of left-hand operand and the right-hand operand.
	+The result is always non-negative.
	+.TP
	.B exp
	Raise the left-hand operand to the
	.IR n th
	diff --git a/src/blind-arithm.c b/src/blind-arithm.c
	@@ -16,6 +16,7 @@ typedef void (process_func)(struct stream left, struct stre…
	X(sub, *lh -= rh, PIXFMT, TYPE)\
	X(mul, lh = rh, PIXFMT, TYPE)\
	X(div, *lh /= rh, PIXFMT, TYPE)\
	+ X(mod, lh = posmod(lh, rh), PIXFMT, TYPE)\
	X(exp, lh = pow(lh, rh), PIXFMT, TYPE)\
	X(log, lh = log2(lh) / log2(rh), PIXFMT, TYPE)\
	X(min, lh = MIN(lh, rh), PIXFMT, TYPE)\
	diff --git a/src/video-math.h b/src/video-math.h
	@@ -17,6 +17,20 @@ nnpowf(float a, float b)
	return neg ? -a : a;
	}

	+static inline double
	+posmod(double a, double b)
	+{
	+ double x = fmod(a, b);
	+ return x < 0 ? x + b : x;
	+}
	+
	+static inline float
	+posmodf(float a, float b)
	+{
	+ float x = fmodf(a, b);
	+ return x < 0 ? x + b : x;
	+}
	+
	#define GENERIC(TYPE, FUNC, ...)\
	TYPE: FUNC(__VA_ARGS__),\
	TYPE *: FUNC(__VA_ARGS__),\
	@@ -52,6 +66,8 @@ nnpowf(float a, float b)
	#define g_isinf(...) MATH_GENERIC_1(isinf, __VA_ARGS__)
	#define g_isfinite(...) MATH_GENERIC_1(isfinite, __VA_ARGS__)
	#define nnpow(...) MATH_GENERIC_N(nnpow, __VA_ARGS__)
	+#define mod(...) MATH_GENERIC_N(fmod, __VA_ARGS__)
	+#define posmod(...) MATH_GENERIC_N(posmod, __VA_ARGS__)

	#define srgb_encode(...) BLIND_GENERIC_1(srgb_encode, __VA_ARGS__)
	#define srgb_decode(...) BLIND_GENERIC_1(srgb_decode, __VA_ARGS__)