return dc_fixpt_mul(args->arg, args->a1);
}
-static struct fixed31_32 calculate_gamma22(struct fixed31_32 arg)
+
+static struct fixed31_32 translate_from_linear_space_long(
+ struct translate_from_linear_space_args *args)
+{
+ const struct fixed31_32 one = dc_fixpt_from_int(1);
+
+ if (dc_fixpt_lt(one, args->arg))
+ return one;
+
+ if (dc_fixpt_le(args->arg, dc_fixpt_neg(args->a0)))
+ return dc_fixpt_sub(
+ args->a2,
+ dc_fixpt_mul(
+ dc_fixpt_add(
+ one,
+ args->a3),
+ dc_fixpt_pow(
+ dc_fixpt_neg(args->arg),
+ dc_fixpt_recip(args->gamma))));
+ else if (dc_fixpt_le(args->a0, args->arg))
+ return dc_fixpt_sub(
+ dc_fixpt_mul(
+ dc_fixpt_add(
+ one,
+ args->a3),
+ dc_fixpt_pow(
+ args->arg,
+ dc_fixpt_recip(args->gamma))),
+ args->a2);
+ else
+ return dc_fixpt_mul(
+ args->arg,
+ args->a1);
+}
+
+static struct fixed31_32 calculate_gamma22(struct fixed31_32 arg, bool use_eetf)
{
struct fixed31_32 gamma = dc_fixpt_from_fraction(22, 10);
scratch_gamma_args.a3 = dc_fixpt_zero;
scratch_gamma_args.gamma = gamma;
+ if (use_eetf)
+ return translate_from_linear_space_long(&scratch_gamma_args);
+
return translate_from_linear_space(&scratch_gamma_args);
}
+
static struct fixed31_32 translate_to_linear_space(
struct fixed31_32 arg,
struct fixed31_32 a0,
if (dc_fixpt_lt(scaledX, dc_fixpt_zero))
output = dc_fixpt_zero;
else
- output = calculate_gamma22(scaledX);
+ output = calculate_gamma22(scaledX, use_eetf);
rgb->r = output;
rgb->g = output;
rgb_degamma_alloc_fail:
return ret;
}
-
-