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/*
* Support for Intel Camera Imaging ISP subsystem.
* Copyright (c) 2015, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include "ia_css_types.h"
#include "sh_css_defs.h"
#include "assert_support.h"
#include "ia_css_ctc2.host.h"
#define INEFFECTIVE_VAL 4096
#define BASIC_VAL 819
/*Default configuration of parameters for Ctc2*/
const struct ia_css_ctc2_config default_ctc2_config = {
INEFFECTIVE_VAL, INEFFECTIVE_VAL, INEFFECTIVE_VAL,
INEFFECTIVE_VAL, INEFFECTIVE_VAL, INEFFECTIVE_VAL,
BASIC_VAL * 2, BASIC_VAL * 4, BASIC_VAL * 6,
BASIC_VAL * 8, INEFFECTIVE_VAL, INEFFECTIVE_VAL,
BASIC_VAL >> 1, BASIC_VAL};
/* (dydx) = ctc2_slope(y1, y0, x1, x0)
* -----------------------------------------------
* Calculation of the Slope of a Line = ((y1 - y0) >> 8)/(x1 - x0)
*
* Note: y1, y0 , x1 & x0 must lie within the range 0 <-> 8191
*/
static int ctc2_slope(int y1, int y0, int x1, int x0)
{
const int shift_val = 8;
const int max_slope = (1 << IA_CSS_CTC_COEF_SHIFT) - 1;
int dy = y1 - y0;
int dx = x1 - x0;
int rounding = (dx + 1) >> 1;
int dy_shift = dy << shift_val;
int slope, dydx;
/*Protection for paramater values, & avoiding zero divisions*/
assert(y0 >= 0 && y0 <= max_slope);
assert(y1 >= 0 && y1 <= max_slope);
assert(x0 >= 0 && x0 <= max_slope);
assert(x1 > 0 && x1 <= max_slope);
assert(dx > 0);
if (dy < 0)
rounding = -rounding;
slope = (int) (dy_shift + rounding) / dx;
/*the slope must lie within the range
(-max_slope-1) >= (dydx) >= (max_slope)
*/
if (slope <= -max_slope-1) {
dydx = -max_slope-1;
} else if (slope >= max_slope) {
dydx = max_slope;
} else {
dydx = slope;
}
return dydx;
}
/* (void) = ia_css_ctc2_vmem_encode(*to, *from)
* -----------------------------------------------
* VMEM Encode Function to translate Y parameters from userspace into ISP space
*/
void ia_css_ctc2_vmem_encode(struct ia_css_isp_ctc2_vmem_params *to,
const struct ia_css_ctc2_config *from,
size_t size)
{
unsigned i, j;
const unsigned shffl_blck = 4;
const unsigned lenght_zeros = 11;
short dydx0, dydx1, dydx2, dydx3, dydx4;
(void)size;
/*
* Calculation of slopes of lines interconnecting
* 0.0 -> y_x1 -> y_x2 -> y _x3 -> y_x4 -> 1.0
*/
dydx0 = ctc2_slope(from->y_y1, from->y_y0,
from->y_x1, 0);
dydx1 = ctc2_slope(from->y_y2, from->y_y1,
from->y_x2, from->y_x1);
dydx2 = ctc2_slope(from->y_y3, from->y_y2,
from->y_x3, from->y_x2);
dydx3 = ctc2_slope(from->y_y4, from->y_y3,
from->y_x4, from->y_x3);
dydx4 = ctc2_slope(from->y_y5, from->y_y4,
SH_CSS_BAYER_MAXVAL, from->y_x4);
/*Fill 3 arrays with:
* - Luma input gain values y_y0, y_y1, y_y2, y_3, y_y4
* - Luma kneepoints 0, y_x1, y_x2, y_x3, y_x4
* - Calculated slopes dydx0, dyxd1, dydx2, dydx3, dydx4
*
* - Each 64-element array is divided in blocks of 16 elements:
* the 5 parameters + zeros in the remaining 11 positions
* - All blocks of the same array will contain the same data
*/
for (i = 0; i < shffl_blck; i++) {
to->y_x[0][(i << shffl_blck)] = 0;
to->y_x[0][(i << shffl_blck) + 1] = from->y_x1;
to->y_x[0][(i << shffl_blck) + 2] = from->y_x2;
to->y_x[0][(i << shffl_blck) + 3] = from->y_x3;
to->y_x[0][(i << shffl_blck) + 4] = from->y_x4;
to->y_y[0][(i << shffl_blck)] = from->y_y0;
to->y_y[0][(i << shffl_blck) + 1] = from->y_y1;
to->y_y[0][(i << shffl_blck) + 2] = from->y_y2;
to->y_y[0][(i << shffl_blck) + 3] = from->y_y3;
to->y_y[0][(i << shffl_blck) + 4] = from->y_y4;
to->e_y_slope[0][(i << shffl_blck)] = dydx0;
to->e_y_slope[0][(i << shffl_blck) + 1] = dydx1;
to->e_y_slope[0][(i << shffl_blck) + 2] = dydx2;
to->e_y_slope[0][(i << shffl_blck) + 3] = dydx3;
to->e_y_slope[0][(i << shffl_blck) + 4] = dydx4;
for (j = 0; j < lenght_zeros; j++) {
to->y_x[0][(i << shffl_blck) + 5 + j] = 0;
to->y_y[0][(i << shffl_blck) + 5 + j] = 0;
to->e_y_slope[0][(i << shffl_blck)+ 5 + j] = 0;
}
}
}
/* (void) = ia_css_ctc2_encode(*to, *from)
* -----------------------------------------------
* DMEM Encode Function to translate UV parameters from userspace into ISP space
*/
void ia_css_ctc2_encode(struct ia_css_isp_ctc2_dmem_params *to,
struct ia_css_ctc2_config *from,
size_t size)
{
(void)size;
to->uv_y0 = from->uv_y0;
to->uv_y1 = from->uv_y1;
to->uv_x0 = from->uv_x0;
to->uv_x1 = from->uv_x1;
/*Slope Calculation*/
to->uv_dydx = ctc2_slope(from->uv_y1, from->uv_y0,
from->uv_x1, from->uv_x0);
}
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