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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 "type_support.h"
#include "math_support.h"
#include "sh_css_defs.h"
#include "assert_support.h"
#include "ia_css_xnr3_0_11.host.h"
/*
* XNR 3.0.11 division look-up table
*/
#define XNR3_0_11_LOOK_UP_TABLE_POINTS 16
static const int16_t x[XNR3_0_11_LOOK_UP_TABLE_POINTS] = {
512, 637, 782, 952, 1147, 1372, 1627, 1917, 2242,
2597, 2992, 3427, 3907, 4432, 5007, 5632};
static const int16_t a[XNR3_0_11_LOOK_UP_TABLE_POINTS] = {
-6587, -4309, -2886, -1970, -1362, -7710, -5508,
-4008, -2931, -2219, -1676, -1280, -999, -769, -616, 0};
static const int16_t b[XNR3_0_11_LOOK_UP_TABLE_POINTS] = {
4096, 3292, 2682, 2203, 1828, 1529, 1289, 1094,
935, 808, 701, 612, 537, 473, 419, 372};
static const int16_t c[XNR3_0_11_LOOK_UP_TABLE_POINTS] = {
1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
/*
* Default kernel parameters (weights). In general, default is bypass mode or as close
* to the ineffective values as possible. Due to the chroma down+upsampling,
* perfect bypass mode is not possible for xnr3.
*/
const struct ia_css_xnr3_0_11_config default_xnr3_0_11_config = {
7, 7, 7, 7, 7, 2 };
/* (void) = ia_css_xnr3_0_11_vmem_encode(*to, *from)
* -----------------------------------------------
* VMEM Encode Function to translate UV parameters from userspace into ISP space
*/
void
ia_css_xnr3_0_11_vmem_encode(
struct sh_css_isp_xnr3_0_11_vmem_params *to,
const struct ia_css_xnr3_0_11_config *from,
unsigned size)
{
unsigned i, j, base;
const unsigned total_blocks = 4;
const unsigned shuffle_block = 16;
(void)from;
(void)size;
/* Init */
for (i = 0; i < ISP_VEC_NELEMS; i++) {
to->x[0][i] = 0;
to->a[0][i] = 0;
to->b[0][i] = 0;
to->c[0][i] = 0;
}
/* Constraints on "x":
* - values should be greater or equal to 0.
* - values should be ascending.
*/
assert(x[0] >= 0);
for (j = 1; j < XNR3_0_11_LOOK_UP_TABLE_POINTS; j++) {
assert(x[j] >= 0);
assert(x[j] > x[j-1]);
}
/* The implementation of the calulating 1/x is based on the availability
* of the OP_vec_shuffle16 operation.
* A 64 element vector is split up in 4 blocks of 16 element. Each array is copied to
* a vector 4 times, (starting at 0, 16, 32 and 48). All array elements are copied or
* initialised as described in the KFS. The remaining elements of a vector are set to 0.
*/
/* TODO: guard this code with above assumptions */
for(i = 0; i < total_blocks; i++) {
base = shuffle_block * i;
for (j = 0; j < XNR3_0_11_LOOK_UP_TABLE_POINTS; j++) {
to->x[0][base + j] = x[j];
to->a[0][base + j] = a[j];
to->b[0][base + j] = b[j];
to->c[0][base + j] = c[j];
}
}
}
/* (void) = ia_css_xnr3_0_11_encode(*to, *from)
* -----------------------------------------------
* DMEM Encode Function to translate UV parameters from userspace into ISP space
*/
void
ia_css_xnr3_0_11_encode(
struct sh_css_isp_xnr3_0_11_params *to,
const struct ia_css_xnr3_0_11_config *from,
unsigned size)
{
int kernel_size = XNR_FILTER_SIZE;
/* The adjust factor is the next power of 2
w.r.t. the kernel size*/
int adjust_factor = ceil_pow2(kernel_size);
int32_t weight_y0 = from->weight_y0;
int32_t weight_y1 = from->weight_y1;
int32_t weight_u0 = from->weight_u0;
int32_t weight_u1 = from->weight_u1;
int32_t weight_v0 = from->weight_v0;
int32_t weight_v1 = from->weight_v1;
(void)size;
to->weight_y0 = weight_y0;
to->weight_u0 = weight_u0;
to->weight_v0 = weight_v0;
to->weight_ydiff = (weight_y1 - weight_y0) * adjust_factor / kernel_size;
to->weight_udiff = (weight_u1 - weight_u0) * adjust_factor / kernel_size;
to->weight_vdiff = (weight_v1 - weight_v0) * adjust_factor / kernel_size;
}
/* (void) = ia_css_xnr3_0_11_debug_dtrace(*config, level)
* -----------------------------------------------
* Dummy Function added as the tool expects it
*/
void
ia_css_xnr3_0_11_debug_dtrace(
const struct ia_css_xnr3_0_11_config *config,
unsigned level)
{
(void)config;
(void)level;
}
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