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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-lib
* Created on: 31 мар. 2020 г.
*
* lsp-dsp-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-lib 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_DSP_ARCH_GENERIC_GRAPHICS_H_
#define PRIVATE_DSP_ARCH_GENERIC_GRAPHICS_H_
#ifndef PRIVATE_DSP_ARCH_GENERIC_IMPL
#error "This header should not be included directly"
#endif /* PRIVATE_DSP_ARCH_GENERIC_IMPL */
#include <private/dsp/arch/generic/graphics/pixelfmt.h>
namespace lsp
{
namespace generic
{
void axis_apply_log2(float *x, float *y, const float *v, float zero, float norm_x, float norm_y, size_t count)
{
for (size_t i=0; i<count; ++i)
{
float vec = v[i];
if (vec < 0.0f)
vec = -vec;
if (vec < LSP_DSP_AMPLIFICATION_THRESH)
vec = LSP_DSP_AMPLIFICATION_THRESH;
float k = logf(vec * zero);
x[i] += norm_x * k;
y[i] += norm_y * k;
}
}
void axis_apply_log1(float *x, const float *v, float zero, float norm_x, size_t count)
{
for (size_t i=0; i<count; ++i)
{
float vec = v[i];
if (vec < 0.0f)
vec = -vec;
if (vec < LSP_DSP_AMPLIFICATION_THRESH)
vec = LSP_DSP_AMPLIFICATION_THRESH;
float k = logf(vec * zero);
x[i] += norm_x * k;
}
}
void fill_rgba(float *dst, float r, float g, float b, float a, size_t count)
{
while (count--)
{
dst[0] = r;
dst[1] = g;
dst[2] = b;
dst[3] = a;
dst += 4;
}
}
void fill_hsla(float *dst, float h, float s, float l, float a, size_t count)
{
while (count--)
{
dst[0] = h;
dst[1] = s;
dst[2] = l;
dst[3] = a;
dst += 4;
}
}
static const float HSL_RGB_0_5 = 0.5f;
static const float HSL_RGB_1_3 = 1.0f / 3.0f;
static const float HSL_RGB_1_6 = 1.0f / 6.0f;
static const float HSL_RGB_2_3 = 2.0f / 3.0f;
void rgba_to_hsla(float *dst, const float *src, size_t count)
{
float R, G, B, H, S, L;
for (size_t i=0; i<count; ++i, dst += 4, src += 4)
{
R = src[0];
G = src[1];
B = src[2];
float cmax = (R < G) ? ((B < G) ? G : B) : ((B < R) ? R : B);
float cmin = (R < G) ? ((B < R) ? B : R) : ((B < G) ? B : G);
float d = cmax - cmin;
L = HSL_RGB_0_5 * (cmax + cmin);
// Calculate hue
if (d == 0.0f)
H = 0.0f;
else if (R == cmax)
{
H = (G - B) / d;
if (H < 0.0f)
H += 6.0f;
}
else if (G == cmax)
H = (B - R) / d + 2.0f;
else
H = (R - G) / d + 4.0f;
// Calculate saturation
if (L <= 0.5f)
S = (L != 0.0f) ? d / L : 0.0f;
else
S = (L != 1.0f) ? d / (1.0f - L) : 0.0f;
// Normalize hue and saturation
H *= HSL_RGB_1_6;
S *= HSL_RGB_0_5;
dst[0] = H;
dst[1] = S;
dst[2] = L;
dst[3] = src[3];
}
}
void hsla_to_rgba(float *dst, const float *src, size_t count)
{
float R, G, B, H, S, L;
float temp1, temp2, tempr, tempg, tempb, k;
for (size_t i=0; i<count; ++i, dst += 4, src += 4)
{
H = src[0];
S = src[1];
L = src[2];
// if (S <= 0.0f)
// {
// dst[0] = L;
// dst[1] = L;
// dst[2] = L;
// dst[3] = src[3];
// continue;
// }
//Set the temporary values
if (L < HSL_RGB_0_5)
temp2 = L + (L * S);
else
temp2 = (L + S) - (L * S);
temp1 = L + L - temp2;
tempr = H + HSL_RGB_1_3;
if (tempr > 1.0f)
tempr -= 1.0f;
tempg = H;
tempb = H - HSL_RGB_1_3;
if (tempb < 0.0f)
tempb += 1.0f;
k = (temp2 - temp1) * 6.0f;
/*
float ktr = temp1 + k * tempr;
float rtr = temp1 + k * (HSL_RGB_2_3 - tempr);
float ktg = temp1 + k * tempg;
float rtg = temp1 + k * (HSL_RGB_2_3 - tempg);
float ktb = temp1 + k * tempb;
float rtb = temp1 + k * (HSL_RGB_2_3 - tempb);
printf("ktr = %.2f, ktg=%.2f, ktb=%.2f\n", ktr, ktg, ktb);
printf("rtr = %.2f, rtg=%.2f, rtb=%.2f\n", rtr, rtg, rtb);*/
//Red
if (tempr < HSL_RGB_0_5)
R = (tempr < HSL_RGB_1_6) ? temp1 + k * tempr : temp2;
else
R = (tempr < HSL_RGB_2_3) ? temp1 + k * (HSL_RGB_2_3 - tempr) : temp1;
//Green
if (tempg < HSL_RGB_0_5)
G = (tempg < HSL_RGB_1_6) ? temp1 + k * tempg : temp2;
else
G = (tempg < HSL_RGB_2_3) ? temp1 + k * (HSL_RGB_2_3 - tempg) : temp1;
//Blue
if (tempb < HSL_RGB_0_5)
B = (tempb < HSL_RGB_1_6) ? temp1 + k * tempb : temp2;
else
B = (tempb < HSL_RGB_2_3) ? temp1 + k * (HSL_RGB_2_3 - tempb) : temp1;
dst[0] = R;
dst[1] = G;
dst[2] = B;
dst[3] = src[3];
}
}
} /* namespace generic */
} /* namespace lsp */
#endif /* PRIVATE_DSP_ARCH_GENERIC_GRAPHICS_H_ */
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