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Commit f3ba7a2f authored by Dmytro Laktyushkin's avatar Dmytro Laktyushkin Committed by Alex Deucher
Browse files

drm/amd/display: inline more of fixed point code 



Signed-off-by: default avatarDmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: default avatarTony Cheng <Tony.Cheng@amd.com>
Acked-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent eb0e5154

drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c

+15 −141
Original line number Diff line number Diff line
@@ -64,9 +64,7 @@ static inline unsigned long long complete_integer_division_u64( 
#define GET_FRACTIONAL_PART(x) \

	(FRACTIONAL_PART_MASK & (x))



struct fixed31_32 dc_fixpt_from_fraction(

	long long numerator,

	long long denominator)

struct fixed31_32 dc_fixpt_from_fraction(long long numerator, long long denominator)

{

	struct fixed31_32 res;
@@ -118,63 +116,7 @@ struct fixed31_32 dc_fixpt_from_fraction( 
	return res;

}



struct fixed31_32 dc_fixpt_from_int_nonconst(

	long long arg)

{

	struct fixed31_32 res;



	ASSERT((LONG_MIN <= arg) && (arg <= LONG_MAX));



	res.value = arg << FIXED31_32_BITS_PER_FRACTIONAL_PART;



	return res;

}



struct fixed31_32 dc_fixpt_shl(

	struct fixed31_32 arg,

	unsigned char shift)

{

	struct fixed31_32 res;



	ASSERT(((arg.value >= 0) && (arg.value <= LLONG_MAX >> shift)) ||

		((arg.value < 0) && (arg.value >= LLONG_MIN >> shift)));



	res.value = arg.value << shift;



	return res;

}



struct fixed31_32 dc_fixpt_add(

	struct fixed31_32 arg1,

	struct fixed31_32 arg2)

{

	struct fixed31_32 res;



	ASSERT(((arg1.value >= 0) && (LLONG_MAX - arg1.value >= arg2.value)) ||

		((arg1.value < 0) && (LLONG_MIN - arg1.value <= arg2.value)));



	res.value = arg1.value + arg2.value;



	return res;

}



struct fixed31_32 dc_fixpt_sub(

	struct fixed31_32 arg1,

	struct fixed31_32 arg2)

{

	struct fixed31_32 res;



	ASSERT(((arg2.value >= 0) && (LLONG_MIN + arg2.value <= arg1.value)) ||

		((arg2.value < 0) && (LLONG_MAX + arg2.value >= arg1.value)));



	res.value = arg1.value - arg2.value;



	return res;

}



struct fixed31_32 dc_fixpt_mul(

	struct fixed31_32 arg1,

	struct fixed31_32 arg2)

struct fixed31_32 dc_fixpt_mul(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	struct fixed31_32 res;
@@ -225,8 +167,7 @@ struct fixed31_32 dc_fixpt_mul( 
	return res;

}



struct fixed31_32 dc_fixpt_sqr(

	struct fixed31_32 arg)

struct fixed31_32 dc_fixpt_sqr(struct fixed31_32 arg)

{

	struct fixed31_32 res;
@@ -266,8 +207,7 @@ struct fixed31_32 dc_fixpt_sqr( 
	return res;

}



struct fixed31_32 dc_fixpt_recip(

	struct fixed31_32 arg)

struct fixed31_32 dc_fixpt_recip(struct fixed31_32 arg)

{

	/*

	 * @note
@@ -281,8 +221,7 @@ struct fixed31_32 dc_fixpt_recip( 
		arg.value);

}



struct fixed31_32 dc_fixpt_sinc(

	struct fixed31_32 arg)

struct fixed31_32 dc_fixpt_sinc(struct fixed31_32 arg)

{

	struct fixed31_32 square;
@@ -326,16 +265,14 @@ struct fixed31_32 dc_fixpt_sinc( 
	return res;

}



struct fixed31_32 dc_fixpt_sin(

	struct fixed31_32 arg)

struct fixed31_32 dc_fixpt_sin(struct fixed31_32 arg)

{

	return dc_fixpt_mul(

		arg,

		dc_fixpt_sinc(arg));

}



struct fixed31_32 dc_fixpt_cos(

	struct fixed31_32 arg)

struct fixed31_32 dc_fixpt_cos(struct fixed31_32 arg)

{

	/* TODO implement argument normalization */
@@ -367,8 +304,7 @@ struct fixed31_32 dc_fixpt_cos( 
 *

 * Calculated as Taylor series.

 */

static struct fixed31_32 fixed31_32_exp_from_taylor_series(

	struct fixed31_32 arg)

static struct fixed31_32 fixed31_32_exp_from_taylor_series(struct fixed31_32 arg)

{

	unsigned int n = 9;
@@ -396,8 +332,7 @@ static struct fixed31_32 fixed31_32_exp_from_taylor_series( 
			res));

}



struct fixed31_32 dc_fixpt_exp(

	struct fixed31_32 arg)

struct fixed31_32 dc_fixpt_exp(struct fixed31_32 arg)

{

	/*

	 * @brief
@@ -440,8 +375,7 @@ struct fixed31_32 dc_fixpt_exp( 
		return dc_fixpt_one;

}



struct fixed31_32 dc_fixpt_log(

	struct fixed31_32 arg)

struct fixed31_32 dc_fixpt_log(struct fixed31_32 arg)

{

	struct fixed31_32 res = dc_fixpt_neg(dc_fixpt_one);

	/* TODO improve 1st estimation */
@@ -472,61 +406,6 @@ struct fixed31_32 dc_fixpt_log( 
	return res;

}



struct fixed31_32 dc_fixpt_pow(

	struct fixed31_32 arg1,

	struct fixed31_32 arg2)

{

	return dc_fixpt_exp(

		dc_fixpt_mul(

			dc_fixpt_log(arg1),

			arg2));

}



int dc_fixpt_floor(

	struct fixed31_32 arg)

{

	unsigned long long arg_value = abs_i64(arg.value);



	if (arg.value >= 0)

		return (int)GET_INTEGER_PART(arg_value);

	else

		return -(int)GET_INTEGER_PART(arg_value);

}



int dc_fixpt_round(

	struct fixed31_32 arg)

{

	unsigned long long arg_value = abs_i64(arg.value);



	const long long summand = dc_fixpt_half.value;



	ASSERT(LLONG_MAX - (long long)arg_value >= summand);



	arg_value += summand;



	if (arg.value >= 0)

		return (int)GET_INTEGER_PART(arg_value);

	else

		return -(int)GET_INTEGER_PART(arg_value);

}



int dc_fixpt_ceil(

	struct fixed31_32 arg)

{

	unsigned long long arg_value = abs_i64(arg.value);



	const long long summand = dc_fixpt_one.value -

		dc_fixpt_epsilon.value;



	ASSERT(LLONG_MAX - (long long)arg_value >= summand);



	arg_value += summand;



	if (arg.value >= 0)

		return (int)GET_INTEGER_PART(arg_value);

	else

		return -(int)GET_INTEGER_PART(arg_value);

}



/* this function is a generic helper to translate fixed point value to

 * specified integer format that will consist of integer_bits integer part and
@@ -570,32 +449,27 @@ static inline unsigned int clamp_ux_dy( 
		return min_clamp;

}



unsigned int dc_fixpt_u2d19(

	struct fixed31_32 arg)

unsigned int dc_fixpt_u2d19(struct fixed31_32 arg)

{

	return ux_dy(arg.value, 2, 19);

}



unsigned int dc_fixpt_u0d19(

	struct fixed31_32 arg)

unsigned int dc_fixpt_u0d19(struct fixed31_32 arg)

{

	return ux_dy(arg.value, 0, 19);

}



unsigned int dc_fixpt_clamp_u0d14(

	struct fixed31_32 arg)

unsigned int dc_fixpt_clamp_u0d14(struct fixed31_32 arg)

{

	return clamp_ux_dy(arg.value, 0, 14, 1);

}



unsigned int dc_fixpt_clamp_u0d10(

	struct fixed31_32 arg)

unsigned int dc_fixpt_clamp_u0d10(struct fixed31_32 arg)

{

	return clamp_ux_dy(arg.value, 0, 10, 1);

}



int dc_fixpt_s4d19(

	struct fixed31_32 arg)

int dc_fixpt_s4d19(struct fixed31_32 arg)

{

	if (arg.value < 0)

		return -(int)ux_dy(dc_fixpt_abs(arg).value, 4, 19);

drivers/gpu/drm/amd/display/include/fixed31_32.h

+116 −91
Original line number Diff line number Diff line
@@ -70,24 +70,19 @@ static const struct fixed31_32 dc_fixpt_ln2_div_2 = { 1488522236LL }; 
 * @brief

 * result = numerator / denominator

 */

struct fixed31_32 dc_fixpt_from_fraction(

	long long numerator,

	long long denominator);

struct fixed31_32 dc_fixpt_from_fraction(long long numerator, long long denominator);



/*

 * @brief

 * result = arg

 */

struct fixed31_32 dc_fixpt_from_int_nonconst(long long arg);

static inline struct fixed31_32 dc_fixpt_from_int(long long arg)

static inline struct fixed31_32 dc_fixpt_from_int(int arg)

{

	if (__builtin_constant_p(arg)) {

	struct fixed31_32 res;

		BUILD_BUG_ON((LONG_MIN > arg) || (arg > LONG_MAX));

		res.value = arg << FIXED31_32_BITS_PER_FRACTIONAL_PART;



	res.value = (long long) arg << FIXED31_32_BITS_PER_FRACTIONAL_PART;



	return res;

	} else

		return dc_fixpt_from_int_nonconst(arg);

}



/*
@@ -129,8 +124,7 @@ static inline struct fixed31_32 dc_fixpt_abs(struct fixed31_32 arg) 
 * @brief

 * result = arg1 < arg2

 */

static inline bool dc_fixpt_lt(struct fixed31_32 arg1,

				     struct fixed31_32 arg2)

static inline bool dc_fixpt_lt(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	return arg1.value < arg2.value;

}
@@ -139,8 +133,7 @@ static inline bool dc_fixpt_lt(struct fixed31_32 arg1, 
 * @brief

 * result = arg1 <= arg2

 */

static inline bool dc_fixpt_le(struct fixed31_32 arg1,

				     struct fixed31_32 arg2)

static inline bool dc_fixpt_le(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	return arg1.value <= arg2.value;

}
@@ -149,8 +142,7 @@ static inline bool dc_fixpt_le(struct fixed31_32 arg1, 
 * @brief

 * result = arg1 == arg2

 */

static inline bool dc_fixpt_eq(struct fixed31_32 arg1,

				     struct fixed31_32 arg2)

static inline bool dc_fixpt_eq(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	return arg1.value == arg2.value;

}
@@ -159,8 +151,7 @@ static inline bool dc_fixpt_eq(struct fixed31_32 arg1, 
 * @brief

 * result = min(arg1, arg2) := (arg1 <= arg2) ? arg1 : arg2

 */

static inline struct fixed31_32 dc_fixpt_min(struct fixed31_32 arg1,

						   struct fixed31_32 arg2)

static inline struct fixed31_32 dc_fixpt_min(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	if (arg1.value <= arg2.value)

		return arg1;
@@ -172,8 +163,7 @@ static inline struct fixed31_32 dc_fixpt_min(struct fixed31_32 arg1, 
 * @brief

 * result = max(arg1, arg2) := (arg1 <= arg2) ? arg2 : arg1

 */

static inline struct fixed31_32 dc_fixpt_max(struct fixed31_32 arg1,

						   struct fixed31_32 arg2)

static inline struct fixed31_32 dc_fixpt_max(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	if (arg1.value <= arg2.value)

		return arg2;
@@ -209,17 +199,23 @@ static inline struct fixed31_32 dc_fixpt_clamp( 
 * @brief

 * result = arg << shift

 */

struct fixed31_32 dc_fixpt_shl(

	struct fixed31_32 arg,

	unsigned char shift);

static inline struct fixed31_32 dc_fixpt_shl(struct fixed31_32 arg, unsigned char shift)

{

	struct fixed31_32 res;



	ASSERT(((arg.value >= 0) && (arg.value <= LLONG_MAX >> shift)) ||

		((arg.value < 0) && (arg.value >= LLONG_MIN >> shift)));



	res.value = arg.value << shift;



	return res;

}



/*

 * @brief

 * result = arg >> shift

 */

static inline struct fixed31_32 dc_fixpt_shr(

	struct fixed31_32 arg,

	unsigned char shift)

static inline struct fixed31_32 dc_fixpt_shr(struct fixed31_32 arg, unsigned char shift)

{

	struct fixed31_32 res;

	res.value = arg.value >> shift;
@@ -235,38 +231,50 @@ static inline struct fixed31_32 dc_fixpt_shr( 
 * @brief

 * result = arg1 + arg2

 */

struct fixed31_32 dc_fixpt_add(

	struct fixed31_32 arg1,

	struct fixed31_32 arg2);

static inline struct fixed31_32 dc_fixpt_add(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	struct fixed31_32 res;



	ASSERT(((arg1.value >= 0) && (LLONG_MAX - arg1.value >= arg2.value)) ||

		((arg1.value < 0) && (LLONG_MIN - arg1.value <= arg2.value)));



	res.value = arg1.value + arg2.value;



	return res;

}



/*

 * @brief

 * result = arg1 + arg2

 */

static inline struct fixed31_32 dc_fixpt_add_int(struct fixed31_32 arg1,

						       int arg2)

static inline struct fixed31_32 dc_fixpt_add_int(struct fixed31_32 arg1, int arg2)

{

	return dc_fixpt_add(arg1,

				  dc_fixpt_from_int(arg2));

	return dc_fixpt_add(arg1, dc_fixpt_from_int(arg2));

}



/*

 * @brief

 * result = arg1 - arg2

 */

struct fixed31_32 dc_fixpt_sub(

	struct fixed31_32 arg1,

	struct fixed31_32 arg2);

static inline struct fixed31_32 dc_fixpt_sub(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	struct fixed31_32 res;



	ASSERT(((arg2.value >= 0) && (LLONG_MIN + arg2.value <= arg1.value)) ||

		((arg2.value < 0) && (LLONG_MAX + arg2.value >= arg1.value)));



	res.value = arg1.value - arg2.value;



	return res;

}



/*

 * @brief

 * result = arg1 - arg2

 */

static inline struct fixed31_32 dc_fixpt_sub_int(struct fixed31_32 arg1,

						       int arg2)

static inline struct fixed31_32 dc_fixpt_sub_int(struct fixed31_32 arg1, int arg2)

{

	return dc_fixpt_sub(arg1,

				  dc_fixpt_from_int(arg2));

	return dc_fixpt_sub(arg1, dc_fixpt_from_int(arg2));

}
@@ -279,49 +287,40 @@ static inline struct fixed31_32 dc_fixpt_sub_int(struct fixed31_32 arg1, 
 * @brief

 * result = arg1 * arg2

 */

struct fixed31_32 dc_fixpt_mul(

	struct fixed31_32 arg1,

	struct fixed31_32 arg2);

struct fixed31_32 dc_fixpt_mul(struct fixed31_32 arg1, struct fixed31_32 arg2);





/*

 * @brief

 * result = arg1 * arg2

 */

static inline struct fixed31_32 dc_fixpt_mul_int(struct fixed31_32 arg1,

						       int arg2)

static inline struct fixed31_32 dc_fixpt_mul_int(struct fixed31_32 arg1, int arg2)

{

	return dc_fixpt_mul(arg1,

				  dc_fixpt_from_int(arg2));

	return dc_fixpt_mul(arg1, dc_fixpt_from_int(arg2));

}



/*

 * @brief

 * result = square(arg) := arg * arg

 */

struct fixed31_32 dc_fixpt_sqr(

	struct fixed31_32 arg);

struct fixed31_32 dc_fixpt_sqr(struct fixed31_32 arg);



/*

 * @brief

 * result = arg1 / arg2

 */

static inline struct fixed31_32 dc_fixpt_div_int(struct fixed31_32 arg1,

						       long long arg2)

static inline struct fixed31_32 dc_fixpt_div_int(struct fixed31_32 arg1, long long arg2)

{

	return dc_fixpt_from_fraction(arg1.value,

					    dc_fixpt_from_int(arg2).value);

	return dc_fixpt_from_fraction(arg1.value, dc_fixpt_from_int(arg2).value);

}



/*

 * @brief

 * result = arg1 / arg2

 */

static inline struct fixed31_32 dc_fixpt_div(struct fixed31_32 arg1,

						   struct fixed31_32 arg2)

static inline struct fixed31_32 dc_fixpt_div(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	return dc_fixpt_from_fraction(arg1.value,

					    arg2.value);

	return dc_fixpt_from_fraction(arg1.value, arg2.value);

}



/*
@@ -336,8 +335,7 @@ static inline struct fixed31_32 dc_fixpt_div(struct fixed31_32 arg1, 
 * @note

 * No special actions taken in case argument is zero.

 */

struct fixed31_32 dc_fixpt_recip(

	struct fixed31_32 arg);

struct fixed31_32 dc_fixpt_recip(struct fixed31_32 arg);



/*

 * @brief
@@ -352,8 +350,7 @@ struct fixed31_32 dc_fixpt_recip( 
 * Argument specified in radians,

 * internally it's normalized to [-2pi...2pi] range.

 */

struct fixed31_32 dc_fixpt_sinc(

	struct fixed31_32 arg);

struct fixed31_32 dc_fixpt_sinc(struct fixed31_32 arg);



/*

 * @brief
@@ -363,8 +360,7 @@ struct fixed31_32 dc_fixpt_sinc( 
 * Argument specified in radians,

 * internally it's normalized to [-2pi...2pi] range.

 */

struct fixed31_32 dc_fixpt_sin(

	struct fixed31_32 arg);

struct fixed31_32 dc_fixpt_sin(struct fixed31_32 arg);



/*

 * @brief
@@ -376,8 +372,7 @@ struct fixed31_32 dc_fixpt_sin( 
 * passing arguments outside that range

 * will cause incorrect result!

 */

struct fixed31_32 dc_fixpt_cos(

	struct fixed31_32 arg);

struct fixed31_32 dc_fixpt_cos(struct fixed31_32 arg);



/*

 * @brief
@@ -391,8 +386,7 @@ struct fixed31_32 dc_fixpt_cos( 
 * @note

 * Currently, function is verified for abs(arg) <= 1.

 */

struct fixed31_32 dc_fixpt_exp(

	struct fixed31_32 arg);

struct fixed31_32 dc_fixpt_exp(struct fixed31_32 arg);



/*

 * @brief
@@ -404,8 +398,7 @@ struct fixed31_32 dc_fixpt_exp( 
 * Currently, no special actions taken

 * in case of invalid argument(s). Take care!

 */

struct fixed31_32 dc_fixpt_log(

	struct fixed31_32 arg);

struct fixed31_32 dc_fixpt_log(struct fixed31_32 arg);



/*

 * @brief
@@ -419,9 +412,13 @@ struct fixed31_32 dc_fixpt_log( 
 * @note

 * Currently, abs(arg1) should be less than 1. Take care!

 */

struct fixed31_32 dc_fixpt_pow(

	struct fixed31_32 arg1,

	struct fixed31_32 arg2);

static inline struct fixed31_32 dc_fixpt_pow(struct fixed31_32 arg1, struct fixed31_32 arg2)

{

	return dc_fixpt_exp(

		dc_fixpt_mul(

			dc_fixpt_log(arg1),

			arg2));

}



/*

 * @brief
@@ -432,22 +429,56 @@ struct fixed31_32 dc_fixpt_pow( 
 * @brief

 * result = floor(arg) := greatest integer lower than or equal to arg

 */

int dc_fixpt_floor(

	struct fixed31_32 arg);

static inline int dc_fixpt_floor(struct fixed31_32 arg)

{

	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;



	if (arg.value >= 0)

		return (int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);

	else

		return -(int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);

}



/*

 * @brief

 * result = round(arg) := integer nearest to arg

 */

int dc_fixpt_round(

	struct fixed31_32 arg);

static inline int dc_fixpt_round(struct fixed31_32 arg)

{

	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;



	const long long summand = dc_fixpt_half.value;



	ASSERT(LLONG_MAX - (long long)arg_value >= summand);



	arg_value += summand;



	if (arg.value >= 0)

		return (int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);

	else

		return -(int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);

}



/*

 * @brief

 * result = ceil(arg) := lowest integer greater than or equal to arg

 */

int dc_fixpt_ceil(

	struct fixed31_32 arg);

static inline int dc_fixpt_ceil(struct fixed31_32 arg)

{

	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;



	const long long summand = dc_fixpt_one.value -

		dc_fixpt_epsilon.value;



	ASSERT(LLONG_MAX - (long long)arg_value >= summand);



	arg_value += summand;



	if (arg.value >= 0)

		return (int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);

	else

		return -(int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);

}



/* the following two function are used in scaler hw programming to convert fixed

 * point value to format 2 bits from integer part and 19 bits from fractional
@@ -455,20 +486,14 @@ int dc_fixpt_ceil( 
 * fractional

 */



unsigned int dc_fixpt_u2d19(

	struct fixed31_32 arg);



unsigned int dc_fixpt_u0d19(

	struct fixed31_32 arg);

unsigned int dc_fixpt_u2d19(struct fixed31_32 arg);



unsigned int dc_fixpt_u0d19(struct fixed31_32 arg);



unsigned int dc_fixpt_clamp_u0d14(

	struct fixed31_32 arg);

unsigned int dc_fixpt_clamp_u0d14(struct fixed31_32 arg);



unsigned int dc_fixpt_clamp_u0d10(

	struct fixed31_32 arg);

unsigned int dc_fixpt_clamp_u0d10(struct fixed31_32 arg);



int dc_fixpt_s4d19(

	struct fixed31_32 arg);

int dc_fixpt_s4d19(struct fixed31_32 arg);



#endif

drivers/gpu/drm/amd/display/modules/color/color_gamma.c

+4 −4
Original line number Diff line number Diff line
@@ -913,7 +913,7 @@ static void apply_lut_1d( 
	struct fixed31_32 lut2;

	const int max_lut_index = 4095;

	const struct fixed31_32 max_lut_index_f =

			dc_fixpt_from_int_nonconst(max_lut_index);

			dc_fixpt_from_int(max_lut_index);

	int32_t index = 0, index_next = 0;

	struct fixed31_32 index_f;

	struct fixed31_32 delta_lut;
@@ -934,7 +934,7 @@ static void apply_lut_1d( 
			norm_y = dc_fixpt_mul(max_lut_index_f,

						   *regamma_y);

			index = dc_fixpt_floor(norm_y);

			index_f = dc_fixpt_from_int_nonconst(index);

			index_f = dc_fixpt_from_int(index);



			if (index < 0 || index > max_lut_index)

				continue;
@@ -1094,7 +1094,7 @@ static void interpolate_user_regamma(uint32_t hw_points_num, 
	struct fixed31_32 *tf_point;

	struct fixed31_32 hw_x;

	struct fixed31_32 norm_factor =

			dc_fixpt_from_int_nonconst(255);

			dc_fixpt_from_int(255);

	struct fixed31_32 norm_x;

	struct fixed31_32 index_f;

	struct fixed31_32 lut1;
@@ -1134,7 +1134,7 @@ static void interpolate_user_regamma(uint32_t hw_points_num, 
			if (index < 0 || index > 255)

				continue;



			index_f = dc_fixpt_from_int_nonconst(index);

			index_f = dc_fixpt_from_int(index);

			index_next = (index == 255) ? index : index + 1;



			if (color == 0) {