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/* babl - dynamically extendable universal pixel conversion library.
* Copyright (C) 2013, Daniel Sabo
*
* 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 3 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, see
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include "babl-internal.h"
#include "base/util.h"
#include "extensions/util.h"
static void
conv_rgbaF_linear_y8_linear (const Babl *conversion,unsigned char *src,
unsigned char *dst,
long samples)
{
const Babl *space = babl_conversion_get_source_space (conversion);
const double *rgbtoxyz = babl_space_get_rgbtoxyz (space);
const float RGB_LUMINANCE_RED_FLOAT = rgbtoxyz[3];
const float RGB_LUMINANCE_GREEN_FLOAT = rgbtoxyz[4];
const float RGB_LUMINANCE_BLUE_FLOAT = rgbtoxyz[5];
float *s = (float *) src;
long n = samples;
while (n--)
{
float value;
long int v;
value = *s++ * RGB_LUMINANCE_RED_FLOAT;
value += *s++ * RGB_LUMINANCE_GREEN_FLOAT;
value += *s++ * RGB_LUMINANCE_BLUE_FLOAT;
s++;
v = rint (value * 255.0);
*dst++ = (v < 0) ? 0 : ((v > 255) ? 255 : v);
}
}
static void
conv_rgbaF_linear_yF_linear (const Babl *conversion,unsigned char *src,
unsigned char *dst,
long samples)
{
const Babl *space = babl_conversion_get_source_space (conversion);
const double *rgbtoxyz = babl_space_get_rgbtoxyz (space);
const float RGB_LUMINANCE_RED_FLOAT = rgbtoxyz[3];
const float RGB_LUMINANCE_GREEN_FLOAT = rgbtoxyz[4];
const float RGB_LUMINANCE_BLUE_FLOAT = rgbtoxyz[5];
float *s = (float *) src;
float *d = (float *) dst;
long n = samples;
while (n--)
{
float value;
value = *s++ * RGB_LUMINANCE_RED_FLOAT;
value += *s++ * RGB_LUMINANCE_GREEN_FLOAT;
value += *s++ * RGB_LUMINANCE_BLUE_FLOAT;
s++;
*d++ = value;
}
}
static void
conv_rgbaF_linear_yaF_linear (const Babl *conversion,unsigned char *src,
unsigned char *dst,
long samples)
{
const Babl *space = babl_conversion_get_source_space (conversion);
const double *rgbtoxyz = babl_space_get_rgbtoxyz (space);
const float RGB_LUMINANCE_RED_FLOAT = rgbtoxyz[3];
const float RGB_LUMINANCE_GREEN_FLOAT = rgbtoxyz[4];
const float RGB_LUMINANCE_BLUE_FLOAT = rgbtoxyz[5];
float *s = (float *) src;
float *d = (float *) dst;
long n = samples;
while (n--)
{
float value;
value = *s++ * RGB_LUMINANCE_RED_FLOAT;
value += *s++ * RGB_LUMINANCE_GREEN_FLOAT;
value += *s++ * RGB_LUMINANCE_BLUE_FLOAT;
*d++ = value;
*d++ = *s++; /* alpha */
}
}
int init (void);
int
init (void)
{
babl_conversion_new (babl_format ("RGBA float"),
babl_format ("Y u8"),
"linear",
conv_rgbaF_linear_y8_linear,
NULL);
babl_conversion_new (babl_format ("RGBA float"),
babl_format ("Y float"),
"linear",
conv_rgbaF_linear_yF_linear,
NULL);
babl_conversion_new (babl_format ("RGBA float"),
babl_format ("YA float"),
"linear",
conv_rgbaF_linear_yaF_linear,
NULL);
return 0;
}
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