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/**
* @file alg_yuv_to_rgb.h
* @brief color space conversion definitions
* @author Patrick Roth - roth@stettbacher.ch
* @copyright Stettbacher Signal Processing AG
*
* @remarks
*
* <PRE>
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* </PRE>
*
*/
/*
* This code inplements a RGB to YUV color space conversion and is pixel size independent. Including this code at the
* C-Source file will define the pixel-bit-depth (see color.c).
*/
// static void yuv_to_rgb8(uint8_t *img_rgb, const int32_t *img_yuv, const int height, const int width, const int pix_max)
// static void yuv_to_rgb16(uint16_t *img_rgb, const int32_t *img_yuv, const int height, const int width, const int pix_max)
{
int x, y, index;
int blue, green, red;
int val_y, val_u, val_v;
const int scale_fact = 10;
const int green_y = (int)roundf(1.0*(1<<scale_fact));
const int green_u = (int)roundf(-0.1942*(1<<scale_fact));
const int green_v = (int)roundf(-0.5094*(1<<scale_fact));
index = 0;
for(y = 0; y < height; y++) {
for(x = 0; x < width; x++) {
// save YUV values on stack
val_y = img_yuv[index];
val_u = img_yuv[index+1];
val_v = img_yuv[index+2];
red = val_y + val_v;
green = (green_y*val_y + green_u*val_u + green_v*val_v) >> scale_fact;
blue = val_y + val_u;
// range check red
if(red < 0) red = 0;
else if(red > pix_max) red = pix_max;
// range check green
if(green < 0) green = 0;
else if(green > pix_max) green = pix_max;
// range check blue
if(blue < 0) blue = 0;
else if(blue > pix_max) blue = pix_max;
img_rgb[index] = red;
img_rgb[index+1] = green;
img_rgb[index+2] = blue;
index += 3;
}
}
}
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