darktable/data/kernels/extended.cl at master · esq4/darktable · GitHub

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This file is part of darktable,

darktable is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.

darktable is distributed in the hope that 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.

You should have received a copy of the GNU General Public License

along with darktable. If not, see <http://www.gnu.org/licenses/>.

#include "common.h"

#include "colorspace.h"

#include "color_conversion.h"

__kernel void

graduatedndp (read_only image2d_t in, write_only image2d_t out, const int width, const int height, const float4 color,

const float density, const float length_base, const float length_inc_x, const float length_inc_y)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

const float len = length_base + y*length_inc_y + x*length_inc_x;

const float t = 0.693147181f * (density * clamp(0.5f+len, 0.0f, 1.0f)/8.0f);

const float d1 = t * t * 0.5f;

const float d2 = d1 * t * 0.333333333f;

const float d3 = d2 * t * 0.25f;

float dens = 1.0f + t + d1 + d2 + d3;

dens *= dens;

pixel.xyz = fmax((float4)0.0f, pixel / (color + ((float4)1.0f - color) * (float4)dens)).xyz;

write_imagef (out, (int2)(x, y), pixel);

}

__kernel void

graduatedndm (read_only image2d_t in, write_only image2d_t out, const int width, const int height, const float4 color,

const float density, const float length_base, const float length_inc_x, const float length_inc_y)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

const float len = length_base + y*length_inc_y + x*length_inc_x;

const float t = 0.693147181f * (-density * clamp(0.5f-len, 0.0f, 1.0f)/8.0f);

const float d1 = t * t * 0.5f;

const float d2 = d1 * t * 0.333333333f;

const float d3 = d2 * t * 0.25f;

float dens = 1.0f + t + d1 + d2 + d3;

dens *= dens;

pixel.xyz = fmax((float4)0.0f, pixel * (color + ((float4)1.0f - color) * (float4)dens)).xyz;

write_imagef (out, (int2)(x, y), pixel);

}

__kernel void

colorize (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float mix, const float L, const float a, const float b)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

pixel.x = pixel.x * mix + L - 50.0f * mix;

pixel.y = a;

pixel.z = b;

write_imagef (out, (int2)(x, y), pixel);

}

float

GAUSS(float center, float wings, float x)

{

const float b = -1.0f + center * 2.0f;

const float c = (wings / 10.0f) / 2.0f;

return exp(-(x-b)*(x-b)/(c*c));

}

__kernel void

relight (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float center, const float wings, const float ev)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

const float lightness = pixel.x/100.0f;

const float value = -1.0f+(lightness*2.0f);

float gauss = GAUSS(center, wings, value);

if(isnan(gauss) || isinf(gauss))

gauss = 0.0f;

float relight = 1.0f / exp2(-ev * clamp(gauss, 0.0f, 1.0f));

if(isnan(relight) || isinf(relight))

relight = 1.0f;

pixel.x = 100.0f * clamp(lightness*relight, 0.0f, 1.0f);

write_imagef (out, (int2)(x, y), pixel);

}

typedef enum _channelmixer_operation_mode_t

{

OPERATION_MODE_RGB = 0,

OPERATION_MODE_GRAY = 1,

OPERATION_MODE_HSL_V1 = 2,

OPERATION_MODE_HSL_V2 = 3,

} _channelmixer_operation_mode_t;

__kernel void

channelmixer (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const int operation_mode, global const float *hsl_matrix,

global const float *rgb_matrix)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

float4 opixel = (float4)(0.0f, 0.0f, 0.0f, pixel.w);

float gray, hmix, smix, lmix;

switch(operation_mode)

{

case OPERATION_MODE_RGB:

opixel.x = fmax(pixel.x * rgb_matrix[0] + pixel.y * rgb_matrix[1] + pixel.z * rgb_matrix[2], 0.0f);

opixel.y = fmax(pixel.x * rgb_matrix[3] + pixel.y * rgb_matrix[4] + pixel.z * rgb_matrix[5], 0.0f);

opixel.z = fmax(pixel.x * rgb_matrix[6] + pixel.y * rgb_matrix[7] + pixel.z * rgb_matrix[8], 0.0f);

break;

case OPERATION_MODE_GRAY:

gray = fmax(pixel.x * rgb_matrix[0] + pixel.y * rgb_matrix[1] + pixel.z * rgb_matrix[2], 0.0f);

opixel = (float4)(gray, gray, gray, pixel.w);

break;

case OPERATION_MODE_HSL_V1:

hmix = clamp(pixel.x * hsl_matrix[0], 0.0f, 1.0f) + pixel.y * hsl_matrix[1] + pixel.z * hsl_matrix[2];

smix = clamp(pixel.x * hsl_matrix[3], 0.0f, 1.0f) + pixel.y * hsl_matrix[4] + pixel.z * hsl_matrix[5];

lmix = clamp(pixel.x * hsl_matrix[6], 0.0f, 1.0f) + pixel.y * hsl_matrix[7] + pixel.z * hsl_matrix[8];

if( hmix != 0.0f || smix != 0.0f || lmix != 0.0f )

{

float4 hsl = RGB_2_HSL(pixel);

hsl.x = (hmix != 0.0f ) ? hmix : hsl.x;

hsl.y = (smix != 0.0f ) ? smix : hsl.y;

hsl.z = (lmix != 0.0f ) ? lmix : hsl.z;

pixel = HSL_2_RGB(hsl);

}

opixel.x = clamp(pixel.x * rgb_matrix[0] + pixel.y * rgb_matrix[1] + pixel.z * rgb_matrix[2], 0.0f, 1.0f);

opixel.y = clamp(pixel.x * rgb_matrix[3] + pixel.y * rgb_matrix[4] + pixel.z * rgb_matrix[5], 0.0f, 1.0f);

opixel.z = clamp(pixel.x * rgb_matrix[6] + pixel.y * rgb_matrix[7] + pixel.z * rgb_matrix[8], 0.0f, 1.0f);

break;

case OPERATION_MODE_HSL_V2:

hmix = clamp(pixel.x * hsl_matrix[0] + pixel.y * hsl_matrix[1] + pixel.z * hsl_matrix[2], 0.0f, 1.0f);

smix = clamp(pixel.x * hsl_matrix[3] + pixel.y * hsl_matrix[4] + pixel.z * hsl_matrix[5], 0.0f, 1.0f);

lmix = clamp(pixel.x * hsl_matrix[6] + pixel.y * hsl_matrix[7] + pixel.z * hsl_matrix[8], 0.0f, 1.0f);

if( hmix != 0.0f || smix != 0.0f || lmix != 0.0f )

{

pixel = (float4)(clamp(pixel.x, 0.0f, 1.0f), clamp(pixel.y, 0.0f, 1.0f), clamp(pixel.z, 0.0f, 1.0f), pixel.w);

float4 hsl = RGB_2_HSL(pixel);

hsl.x = (hmix != 0.0f ) ? hmix : hsl.x;

hsl.y = (smix != 0.0f ) ? smix : hsl.y;

hsl.z = (lmix != 0.0f ) ? lmix : hsl.z;

pixel = HSL_2_RGB(hsl);

}

opixel.x = fmax(pixel.x * rgb_matrix[0] + pixel.y * rgb_matrix[1] + pixel.z * rgb_matrix[2], 0.0f);

opixel.y = fmax(pixel.x * rgb_matrix[3] + pixel.y * rgb_matrix[4] + pixel.z * rgb_matrix[5], 0.0f);

opixel.z = fmax(pixel.x * rgb_matrix[6] + pixel.y * rgb_matrix[7] + pixel.z * rgb_matrix[8], 0.0f);

break;

}

write_imagef (out, (int2)(x, y), opixel);

}

__kernel void

velvia (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float strength, const float bias)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

// calculate vibrance, and apply boost velvia saturation at least saturated pixels

float pmax = fmax(pixel.x, fmax(pixel.y, pixel.z)); // max value in RGB set

float pmin = fmin(pixel.x, fmin(pixel.y, pixel.z)); // min value in RGB set

float plum = (pmax + pmin) / 2.0f; // pixel luminocity

float psat = (plum <= 0.5f) ? (pmax-pmin)/(1e-5f + pmax+pmin) : (pmax-pmin)/(1e-5f + fmax(0.0f, 2.0f-pmax-pmin));

float pweight = clamp(((1.0f- (1.5f*psat)) + ((1.0f+(fabs(plum-0.5f)*2.0f))*(1.0f-bias))) / (1.0f+(1.0f-bias)), 0.0f, 1.0f); // The weight of pixel

float saturation = strength*pweight; // So lets calculate the final affection of filter on pixel

float4 opixel;

opixel.x = clamp(pixel.x + saturation*(pixel.x-0.5f*(pixel.y+pixel.z)), 0.0f, 1.0f);

opixel.y = clamp(pixel.y + saturation*(pixel.y-0.5f*(pixel.z+pixel.x)), 0.0f, 1.0f);

opixel.z = clamp(pixel.z + saturation*(pixel.z-0.5f*(pixel.x+pixel.y)), 0.0f, 1.0f);

opixel.w = pixel.w;

write_imagef (out, (int2)(x, y), opixel);

}

__kernel void

colorcontrast (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float4 scale, const float4 offset, const int unbound)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

pixel.xyz = (pixel * scale + offset).xyz;

pixel.y = unbound ? pixel.y : clamp(pixel.y, -128.0f, 128.0f);

pixel.z = unbound ? pixel.z : clamp(pixel.z, -128.0f, 128.0f);

write_imagef (out, (int2)(x, y), pixel);

}

__kernel void

vibrance (read_only image2d_t in, write_only image2d_t out, const int width, const int height, const float amount)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

const float sw = sqrt(pixel.y*pixel.y + pixel.z*pixel.z)/256.0f;

const float ls = 1.0f - amount * sw * 0.25f;

const float ss = 1.0f + amount * sw;

pixel.x *= ls;

pixel.y *= ss;

pixel.z *= ss;

write_imagef (out, (int2)(x, y), pixel);

}

#define TEA_ROUNDS 8

void

encrypt_tea(unsigned int *arg)

{

const unsigned int key[] = {0xa341316c, 0xc8013ea4, 0xad90777d, 0x7e95761e};

const unsigned int delta = 0x9e3779b9;

unsigned int v0 = arg[0], v1 = arg[1];

unsigned int sum = 0;

for(int i = 0; i < TEA_ROUNDS; i++)

{

sum += delta;

v0 += ((v1 << 4) + key[0]) ^ (v1 + sum) ^ ((v1 >> 5) + key[1]);

v1 += ((v0 << 4) + key[2]) ^ (v0 + sum) ^ ((v0 >> 5) + key[3]);

}

arg[0] = v0;

arg[1] = v1;

}

float

tpdf(unsigned int urandom)

{

float frandom = (float)urandom / (float)0xFFFFFFFFu;

return (frandom < 0.5f ? (sqrt(2.0f*frandom) - 1.0f) : (1.0f - sqrt(2.0f*(1.0f - frandom))));

}

__kernel void

vignette (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float2 scale, const float2 roi_center_scaled, const float2 expt,

const float dscale, const float fscale, const float brightness, const float saturation,

const float dither, const int unbound)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

unsigned int tea_state[2] = { mad24(y, width, x), 0 };

encrypt_tea(tea_state);

const float2 pv = fabs((float2)(x,y) * scale - roi_center_scaled);

const float cplen = pow(pow(pv.x, expt.x) + pow(pv.y, expt.x), expt.y);

float weight = 0.0f;

float dith = 0.0f;

if(cplen >= dscale)

{

weight = ((cplen - dscale) / fscale);

dith = (weight <= 1.0f && weight >= 0.0f) ? dither * tpdf(tea_state[0]) : 0.0f;

weight = weight >= 1.0f ? 1.0f : (weight <= 0.0f ? 0.0f : 0.5f - cos(M_PI_F * weight) / 2.0f);

}

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

if(weight > 0.0f)

{

float falloff = brightness < 0.0f ? 1.0f + (weight * brightness) : weight * brightness;

pixel.xyz = (brightness < 0.0f ? pixel * falloff + dith : pixel + falloff + dith).xyz;

pixel.xyz = unbound ? pixel.xyz : clamp(pixel, (float4)0.0f, (float4)1.0f).xyz;

float mv = (pixel.x + pixel.y + pixel.z) / 3.0f;

float wss = weight * saturation;

pixel.xyz = (pixel - (mv - pixel)* wss).xyz,

pixel.xyz = unbound ? pixel.xyz : clamp(pixel, (float4)0.0f, (float4)1.0f).xyz;

}

write_imagef (out, (int2)(x, y), pixel);

}

/* kernel for the splittoning plugin. */

kernel void

splittoning (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float compress, const float balance, const float shadow_hue, const float shadow_saturation,

const float highlight_hue, const float highlight_saturation)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

float4 hsl = RGB_2_HSL(pixel);

if(hsl.z < balance - compress || hsl.z > balance + compress)

{

hsl.x = hsl.z < balance ? shadow_hue : highlight_hue;

hsl.y = hsl.z < balance ? shadow_saturation : highlight_saturation;

float ra = hsl.z < balance ? clamp(2.0f*fabs(-balance + compress + hsl.z), 0.0f, 1.0f) :

clamp(2.0f*fabs(-balance - compress + hsl.z), 0.0f, 1.0f);

float4 mixrgb = HSL_2_RGB(hsl);

pixel.xyz = clamp(pixel * (1.0f - ra) + mixrgb * ra, (float4)0.0f, (float4)1.0f).xyz;

}

write_imagef (out, (int2)(x, y), pixel);

}

/* kernels to get the maximum value of an image */

kernel void

pixelmax_first (read_only image2d_t in, const int width, const int height, global float *accu, local float *buffer)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

const int xlsz = get_local_size(0);

const int ylsz = get_local_size(1);

const int xlid = get_local_id(0);

const int ylid = get_local_id(1);

const int l = ylid * xlsz + xlid;

buffer[l] = (x < width && y < height) ? read_imagef(in, sampleri, (int2)(x, y)).x : -INFINITY;

barrier(CLK_LOCAL_MEM_FENCE);

const int lsz = mul24(xlsz, ylsz);

for(int offset = lsz / 2; offset > 0; offset = offset / 2)

{

if (l < offset)

{

float other = buffer[l + offset];

float mine = buffer[l];

buffer[l] = (mine > other) ? mine : other;

}

barrier(CLK_LOCAL_MEM_FENCE);

}

const int xgid = get_group_id(0);

const int ygid = get_group_id(1);

const int xgsz = get_num_groups(0);

const int m = mad24(ygid, xgsz, xgid);

accu[m] = buffer[0];

}

__kernel void

pixelmax_second(global float* input, global float *result, const int length, local float *buffer)

{

int x = get_global_id(0);

float accu = -INFINITY;

while (x < length)

{

float element = input[x];

accu = (accu > element) ? accu : element;

x += get_global_size(0);

}

int lid = get_local_id(0);

buffer[lid] = accu;

barrier(CLK_LOCAL_MEM_FENCE);

for(int offset = get_local_size(0) / 2; offset > 0; offset = offset / 2)

{

if (lid < offset)

{

float other = buffer[lid + offset];

float mine = buffer[lid];

buffer[lid] = (mine > other) ? mine : other;

}

barrier(CLK_LOCAL_MEM_FENCE);

}

if (lid == 0)

{

result[get_group_id(0)] = buffer[0];

}

/* kernel for the global tonemap plugin: reinhard */

kernel void

global_tonemap_reinhard (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float4 parameters)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

float l = pixel.x * 0.01f;

pixel.x = 100.0f * (l/(1.0f + l));

write_imagef (out, (int2)(x, y), pixel);

}

/* kernel for the global tonemap plugin: drago */

kernel void

global_tonemap_drago (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float4 parameters)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

const float eps = parameters.x;

const float ldc = parameters.y;

const float bl = parameters.z;

const float lwmax = parameters.w;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

float lw = pixel.x * 0.01f;

pixel.x = 100.0f * (ldc * log(fmax(eps, lw + 1.0f)) / log(fmax(eps, 2.0f + (pow(lw/lwmax,bl)) * 8.0f)));

write_imagef (out, (int2)(x, y), pixel);

}

/* kernel for the global tonemap plugin: filmic */

kernel void

global_tonemap_filmic (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float4 parameters)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 pixel = read_imagef(in, sampleri, (int2)(x, y));

float l = pixel.x * 0.01f;

float m = fmax(0.0f, l - 0.004f);

pixel.x = 100.0f * ((m*(6.2f*m+0.5f))/(m*(6.2f*m+1.7f)+0.06f));

write_imagef (out, (int2)(x, y), pixel);

}

/* kernels for the colormapping module */

#define HISTN (1<<11)

#define MAXN 5

// inverse distant weighting according to D. Shepard's method; with power parameter 2.0

void

get_clusters(const float4 col, const int n, global float2 *mean, float *weight)

{

float mdist = FLT_MAX;

for(int k=0; k<n; k++)

{

const float dist2 = (col.y-mean[k].x)*(col.y-mean[k].x) + (col.z-mean[k].y)*(col.z-mean[k].y); // dist^2

weight[k] = dist2 > 1.0e-6f ? 1.0f/dist2 : -1.0f; // direct hits marked as -1

if(dist2 < mdist) mdist = dist2;

}

if(mdist < 1.0e-6f) for(int k=0; k<n; k++) weight[k] = weight[k] < 0.0f ? 1.0f : 0.0f; // correction in case of direct hits

float sum = 0.0f;

for(int k=0; k<n; k++) sum += weight[k];

if(sum > 0.0f) for(int k=0; k<n; k++) weight[k] /= sum;

}

kernel void

colormapping_histogram (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float equalization, global int *target_hist, global float *source_ihist)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float L = read_imagef(in, sampleri, (int2)(x, y)).x;

float dL = 0.5f*((L * (1.0f - equalization) + source_ihist[target_hist[(int)clamp(HISTN*L/100.0f, 0.0f, (float)HISTN-1.0f)]] * equalization) - L) + 50.0f;

dL = clamp(dL, 0.0f, 100.0f);

write_imagef (out, (int2)(x, y), (float4)(dL, 0.0f, 0.0f, 0.0f));

}

kernel void

colormapping_mapping (read_only image2d_t in, read_only image2d_t tmp, write_only image2d_t out, const int width, const int height,

const int clusters, global float2 *target_mean, global float2 *source_mean, global float2 *var_ratio, global int *mapio)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 ipixel = read_imagef(in, sampleri, (int2)(x, y));

float dL = read_imagef(tmp, sampleri, (int2)(x, y)).x;

float weight[MAXN];

float4 opixel = (float4)0.0f;

opixel.x = 2.0f*(dL - 50.0f) + ipixel.x;

opixel.x = clamp(opixel.x, 0.0f, 100.0f);

get_clusters(ipixel, clusters, target_mean, weight);

for(int c=0; c < clusters; c++)

{

opixel.y += weight[c] * ((ipixel.y - target_mean[c].x)*var_ratio[c].x + source_mean[mapio[c]].x);

opixel.z += weight[c] * ((ipixel.z - target_mean[c].y)*var_ratio[c].y + source_mean[mapio[c]].y);

}

opixel.w = ipixel.w;

write_imagef (out, (int2)(x, y), opixel);

}

#undef HISTN

#undef MAXN

/* kernel for the colorbalance module */

kernel void

colorbalance (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float4 lift, const float4 gain, const float4 gamma_inv, const float saturation, const float contrast, const float grey)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 Lab = read_imagef(in, sampleri, (int2)(x, y));

float4 sRGB = XYZ_to_sRGB(Lab_to_XYZ(Lab));

// Lift gamma gain

sRGB = (sRGB <= (float4)0.0031308f) ? 12.92f * sRGB : (1.0f + 0.055f) * dtcl_pow(sRGB, (float4)1.0f/2.4f) - (float4)0.055f;

sRGB = dtcl_pow(fmax(((sRGB - (float4)1.0f) * lift + (float4)1.0f) * gain, (float4)0.0f), gamma_inv);

sRGB = (sRGB <= (float4)0.04045f) ? sRGB / 12.92f : dtcl_pow((sRGB + (float4)0.055f) / (1.0f + 0.055f), (float4)2.4f);

Lab.xyz = XYZ_to_Lab(sRGB_to_XYZ(sRGB)).xyz;

write_imagef (out, (int2)(x, y), Lab);

}

kernel void

colorbalance_lgg (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float4 lift, const float4 gain, const float4 gamma_inv, const float saturation, const float contrast, const float grey, const float saturation_out)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 Lab = read_imagef(in, sampleri, (int2)(x, y));

const float4 XYZ = Lab_to_XYZ(Lab);

float4 RGB = XYZ_to_prophotorgb(XYZ);

// saturation input

if (saturation != 1.0f)

{

const float4 luma = XYZ.y;

const float4 saturation4 = saturation;

RGB = luma + saturation4 * (RGB - luma);

}

// Lift gamma gain

RGB = (RGB <= (float4)0.0f) ? (float4)0.0f : dtcl_pow(RGB, (float4)1.0f/2.2f);

RGB = ((RGB - (float4)1.0f) * lift + (float4)1.0f) * gain;

RGB = (RGB <= (float4)0.0f) ? (float4)0.0f : dtcl_pow(RGB, gamma_inv * (float4)2.2f);

// saturation output

if (saturation_out != 1.0f)

{

const float4 luma = prophotorgb_to_XYZ(RGB).y;

const float4 saturation_out4 = saturation_out;

RGB = luma + saturation_out4 * (RGB - luma);

}

// fulcrum contrast

if (contrast != 1.0f)

{

const float4 contrast4 = contrast;

const float4 grey4 = grey;

RGB = (RGB <= (float4)0.0f) ? (float4)0.0f : pow(RGB / grey4, contrast4) * grey4;

}

Lab.xyz = prophotorgb_to_Lab(RGB).xyz;

write_imagef (out, (int2)(x, y), Lab);

}

kernel void

colorbalance_cdl (read_only image2d_t in, write_only image2d_t out, const int width, const int height,

const float4 lift, const float4 gain, const float4 gamma_inv, const float saturation, const float contrast, const float grey, const float saturation_out)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

float4 Lab = read_imagef(in, sampleri, (int2)(x, y));

const float4 XYZ = Lab_to_XYZ(Lab);

float4 RGB = XYZ_to_prophotorgb(XYZ);

// saturation input

if (saturation != 1.0f)

{

const float4 luma = XYZ.y;

const float4 saturation4 = saturation;

RGB = luma + saturation4 * (RGB - luma);

}

// lift power slope

RGB = RGB * gain + lift;

RGB = (RGB <= (float4)0.0f) ? (float4)0.0f : dtcl_pow(RGB, gamma_inv);

// saturation output

if (saturation_out != 1.0f)

{

const float4 luma = prophotorgb_to_XYZ(RGB).y;

const float4 saturation_out4 = saturation_out;

RGB = luma + saturation_out4 * (RGB - luma);

}

// fulcrum contrast

if (contrast != 1.0f)

{

const float4 contrast4 = contrast;

const float4 grey4 = grey;

RGB = (RGB <= (float4)0.0f) ? (float4)0.0f : dtcl_pow(RGB / grey4, contrast4) * grey4;

}

Lab.xyz = prophotorgb_to_Lab(RGB).xyz;

write_imagef (out, (int2)(x, y), Lab);

}

static inline float sqf(const float x)

{

return x * x;

}

static inline float4 opacity_masks(const float x,

const float shadows_weight, const float highlights_weight,

const float midtones_weight, const float mask_grey_fulcrum)

{

float4 output;

const float x_offset = (x - mask_grey_fulcrum);

const float x_offset_norm = x_offset / mask_grey_fulcrum;

const float alpha = 1.f / (1.f + native_exp(x_offset_norm * shadows_weight)); // opacity of shadows

const float beta = 1.f / (1.f + native_exp(-x_offset_norm * highlights_weight)); // opacity of highlights

const float gamma = native_exp(-sqf(x_offset) * midtones_weight / 4.f) * sqf(1.f - alpha) * sqf(1.f - beta) * 8.f; // opacity of midtones

output.x = alpha;

output.y = gamma;

output.z = beta;

output.w = 0.f;

return output;

}

typedef enum dt_iop_colorbalancrgb_saturation_t

{

DT_COLORBALANCE_SATURATION_JZAZBZ = 0, // $DESCRIPTION: "JzAzBz (2021)"

DT_COLORBALANCE_SATURATION_DTUCS = 1 // $DESCRIPTION: "darktable UCS (2022)"

} dt_iop_colorbalancrgb_saturation_t;

kernel void

colorbalancergb (read_only image2d_t in, write_only image2d_t out,

const int width, const int height,

constant const dt_colorspaces_iccprofile_info_cl_t *const profile_info,

constant const float *const matrix_in, constant const float *const matrix_out,

global const float *gamut_lut,

const float shadows_weight, const float highlights_weight, const float midtones_weight, const float mask_grey_fulcrum,

const float hue_angle, const float chroma_global, const float4 chroma, const float vibrance,

const float4 global_offset, const float4 shadows, const float4 highlights, const float4 midtones,

const float white_fulcrum, const float midtones_Y,

const float grey_fulcrum, const float contrast,

const float brilliance_global, const float4 brilliance,

const float saturation_global, const float4 saturation,

const int mask_display, const int mask_type, const int checker_1, const int checker_2,

const float4 checker_color_1, const float4 checker_color_2, const float L_white,

const dt_iop_colorbalancrgb_saturation_t saturation_formula,

constant const float *const hue_rotation_matrix)

{

const int x = get_global_id(0);

const int y = get_global_id(1);

if(x >= width || y >= height) return;

// we clip pipeline RGB while reading; this also ensures a proper alpha

const float4 pix_in = fmax(0.0f, read_imagef(in, sampleri, (int2)(x, y)));

float4 XYZ_D65 = 0.f;

float4 LMS = 0.f;

float4 RGB = 0.f;

float4 Yrg = 0.f;

float4 Ych = 0.f;

RGB = pix_in;

// go to CIE 2006 LMS D65

LMS = matrix_product_float4(RGB, matrix_in);

// go to Filmlight Yrg

Yrg = LMS_to_Yrg(LMS);

// go to Ych

Ych = Yrg_to_Ych(Yrg);

// Sanitize input : no negative luminance

Ych.x = fmax(Ych.x, 0.f);

const float4 opacities = opacity_masks(dtcl_pow(Ych.x, 0.4101205819200422f), // center middle grey in 50 %

shadows_weight, highlights_weight, midtones_weight, mask_grey_fulcrum);

const float4 opacities_comp = (float4)1.f - opacities;

// Hue shift - do it now because we need the gamut limit at output hue right after

// The hue rotation is implemented as a matrix multiplication.

const float cos_h = Ych.z;

const float sin_h = Ych.w;

Ych.z = hue_rotation_matrix[0] * cos_h + hue_rotation_matrix[1] * sin_h;

Ych.w = hue_rotation_matrix[2] * cos_h + hue_rotation_matrix[3] * sin_h;

// Linear chroma : distance to achromatic at constant luminance in scene-referred

const float chroma_boost = chroma_global + dot(opacities, chroma);

const float vib = vibrance * (1.0f - dtcl_pow(Ych.y, fabs(vibrance)));

const float chroma_factor = fmax(1.f + chroma_boost + vib, 0.f);

Ych.y *= chroma_factor;

// clip chroma at constant Y and hue

Ych = gamut_check_Yrg(Ych);

// go to Yrg for real

Yrg = Ych_to_Yrg(Ych);

// Go to LMS

LMS = Yrg_to_LMS(Yrg);

// Go to Filmlight RGB

RGB = LMS_to_gradingRGB(LMS);

// Color balance

// global : offset

RGB += global_offset;

// highlights, shadows : 2 slopes with masking

RGB *= opacities_comp.z * (opacities_comp.x + opacities.x * shadows) + opacities.z * highlights;

// factorization of : (RGB[c] * (1.f - alpha) + RGB[c] * d->shadows[c] * alpha) * (1.f - beta) + RGB[c] * d->highlights[c] * beta;

// midtones : power with sign preservation

RGB = sign(RGB) * dtcl_pow(fabs(RGB) / white_fulcrum, midtones) * white_fulcrum;

// for the non-linear ops we need to go in Yrg again because RGB doesn't preserve color

LMS = gradingRGB_to_LMS(RGB);

Yrg = LMS_to_Yrg(LMS);

// Y midtones power (gamma)

Yrg.x = dtcl_pow(fmax(Yrg.x / white_fulcrum, 0.f), midtones_Y) * white_fulcrum;

// Y fulcrumed contrast

Yrg.x = grey_fulcrum * dtcl_pow(Yrg.x / grey_fulcrum, contrast);

LMS = Yrg_to_LMS(Yrg);

XYZ_D65 = LMS_to_XYZ(LMS);

// Perceptual color adjustments

if(saturation_formula == DT_COLORBALANCE_SATURATION_JZAZBZ)

{

// Go to JzAzBz for perceptual saturation

float4 Jab = XYZ_to_JzAzBz(XYZ_D65);

// Convert to JCh

float JC[2] = { Jab.x, hypot(Jab.y, Jab.z) }; // brightness/chroma vector

const float h = atan2(Jab.z, Jab.y); // hue : (a, b) angle

// Project JC onto S, the saturation eigenvector, with orthogonal vector O.

// Note : O should be = (C * cosf(T) - J * sinf(T)) = 0 since S is the eigenvector,

// so we add the chroma projected along the orthogonal axis to get some control value

const float T = atan2(JC[1], JC[0]); // angle of the eigenvector over the hue plane

const float sin_T = dtcl_sin(T);

const float cos_T = dtcl_cos(T);

const float M_rot_dir[2][2] = { { cos_T, sin_T },

{ -sin_T, cos_T } };

const float M_rot_inv[2][2] = { { cos_T, -sin_T },

{ sin_T, cos_T } };

float SO[2];

// brilliance & Saturation : mix of chroma and luminance

const float boosts[2] = { 1.f + brilliance_global + dot(opacities, brilliance), // move in S direction

saturation_global + dot(opacities, saturation) }; // move in O direction

SO[0] = JC[0] * M_rot_dir[0][0] + JC[1] * M_rot_dir[0][1];

SO[1] = SO[0] * clamp(T * boosts[1], -T, M_PI_F / 2.f - T);

SO[0] = fmax(SO[0] * boosts[0], 0.f);

// Project back to JCh, that is rotate back of -T angle

JC[0] = fmax(SO[0] * M_rot_inv[0][0] + SO[1] * M_rot_inv[0][1], 0.f);

JC[1] = fmax(SO[0] * M_rot_inv[1][0] + SO[1] * M_rot_inv[1][1], 0.f);

// Gamut mapping

const float out_max_sat_h = lookup_gamut(gamut_lut, h);

// if JC[0] == 0.f, the saturation / luminance ratio is infinite - assign the largest practical value we have

const float sat = (JC[0] > 0.f) ? soft_clip(JC[1] / JC[0], 0.8f * out_max_sat_h, out_max_sat_h)

: out_max_sat_h;

const float max_C_at_sat = JC[0] * sat;

// if sat == 0.f, the chroma is zero - assign the original luminance because there's no need to gamut map

const float max_J_at_sat = (sat > 0.f) ? JC[1] / sat : JC[0];

JC[0] = (JC[0] + max_J_at_sat) / 2.f;

JC[1] = (JC[1] + max_C_at_sat) / 2.f;

// Gamut-clip in Jch at constant hue and lightness,

// e.g. find the max chroma available at current hue that doesn't

// yield negative L'M'S' values, which will need to be clipped during conversion

const float cos_H = dtcl_cos(h);

const float sin_H = dtcl_sin(h);

const float d0 = 1.6295499532821566e-11f;

const float d = -0.56f;

float Iz = JC[0] + d0;

Iz /= (1.f + d - d * Iz);

Iz = fmax(Iz, 0.f);

const float4 AI[3] = { { 1.0f, 0.1386050432715393f, 0.0580473161561189f, 0.0f },

{ 1.0f, -0.1386050432715393f, -0.0580473161561189f, 0.0f },

{ 1.0f, -0.0960192420263190f, -0.8118918960560390f, 0.0f } };

// Do a test conversion to L'M'S'

const float4 IzAzBz = { Iz, JC[1] * cos_H, JC[1] * sin_H, 0.f };

LMS.x = dot(AI[0], IzAzBz);

LMS.y = dot(AI[1], IzAzBz);

LMS.z = dot(AI[2], IzAzBz);

// Clip chroma

float max_C = JC[1];

if(LMS.x < 0.f)

max_C = fmin(-Iz / (AI[0].y * cos_H + AI[0].z * sin_H), max_C);

if(LMS.y < 0.f)

max_C = fmin(-Iz / (AI[1].y * cos_H + AI[1].z * sin_H), max_C);

if(LMS.z < 0.f)

max_C = fmin(-Iz / (AI[2].y * cos_H + AI[2].z * sin_H), max_C);

// Project back to JzAzBz for real

Jab.x = JC[0];

Jab.y = max_C * cos_H;

Jab.z = max_C * sin_H;

XYZ_D65 = JzAzBz_2_XYZ(Jab);

}

else

{

float4 xyY = dt_D65_XYZ_to_xyY(XYZ_D65);

float4 JCH = xyY_to_dt_UCS_JCH(xyY, L_white);

float4 HCB = dt_UCS_JCH_to_HCB(JCH);

const float radius = hypot(HCB.y, HCB.z);

const float sin_T = (radius > 0.f) ? HCB.y / radius : 0.f;

const float cos_T = (radius > 0.f) ? HCB.z / radius : 0.f;

const float M_rot_inv[2][2] = { { cos_T, sin_T }, { -sin_T, cos_T } };

// This would be the full matrice of direct rotation if we didn't need only its last row

//const float M_rot_dir[2][2] = { { cos_T, -sin_T }, { sin_T, cos_T } };

const float P = fmax(FLT_MIN, HCB.y);

const float W = sin_T * HCB.y + cos_T * HCB.z;

float a = fmax(1.f + saturation_global + dot(opacities, saturation), 0.f);

const float b = fmax(1.f + brilliance_global + dot(opacities, brilliance), 0.f);

const float max_a = hypot(P, W) / P;

a = soft_clip(a, 0.5f * max_a, max_a);

const float P_prime = (a - 1.f) * P;

const float W_prime = dtcl_sqrt(sqf(P) * (1.f - sqf(a)) + sqf(W)) * b;

HCB.y = fmax(M_rot_inv[0][0] * P_prime + M_rot_inv[0][1] * W_prime, 0.f);

HCB.z = fmax(M_rot_inv[1][0] * P_prime + M_rot_inv[1][1] * W_prime, 0.f);

JCH = dt_UCS_HCB_to_JCH(HCB);

// Gamut mapping

const float max_colorfulness = lookup_gamut(gamut_lut, JCH.z); // WARNING : this is M²

const float max_chroma = 15.932993652962535f * dtcl_pow(JCH.x * L_white, 0.6523997524738018f) * dtcl_pow(max_colorfulness, 0.6007557017508491f) / L_white;

const float4 JCH_gamut_boundary = { JCH.x, max_chroma, JCH.z, 0.f };

const float4 HSB_gamut_boundary = dt_UCS_JCH_to_HSB(JCH_gamut_boundary);

// Clip saturation at constant brightness

float4 HSB = { HCB.x, (HCB.z > 0.f) ? HCB.y / HCB.z : 0.f, HCB.z, 0.f };

HSB.y = soft_clip(HSB.y, 0.8f * HSB_gamut_boundary.y, HSB_gamut_boundary.y);

JCH = dt_UCS_HSB_to_JCH(HSB);

xyY = dt_UCS_JCH_to_xyY(JCH, L_white);

XYZ_D65 = dt_xyY_to_XYZ(xyY);

}

// Project back to D50 pipeline RGB

RGB = matrix_product_float4(XYZ_D65, matrix_out);

if(mask_display)

{

// draw checkerboard

float4 color;

if(x % checker_1 < x % checker_2)

{

if(y % checker_1 < y % checker_2) color = checker_color_2;

else color = checker_color_1;

}

else

{

if(y % checker_1 < y % checker_2) color = checker_color_1;

else color = checker_color_2;

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darktable/data/kernels/extended.cl at master · esq4/darktable · GitHub

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