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/* quirc -- QR-code recognition library
* Copyright (C) 2010-2012 Daniel Beer <dlbeer@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "convert.h"
#define CHANNEL_CLAMP(dst, tmp, lum, chrom) \
(tmp) = ((lum) + (chrom)) >> 8; \
if ((tmp) < 0) \
(tmp) = 0; \
if ((tmp) > 255) \
(tmp) = 255; \
(dst) = (tmp);
void yuyv_to_rgb32(const uint8_t *src, int src_pitch,
int w, int h,
uint8_t *dst, int dst_pitch)
{
int y;
for (y = 0; y < h; y++) {
int x;
const uint8_t *srow = src + y * src_pitch;
uint8_t *drow = dst + y * dst_pitch;
for (x = 0; x < w; x += 2) {
/* ITU-R colorspace assumed */
int y0 = (int)srow[0] * 256;
int y1 = (int)srow[2] * 256;
int cr = (int)srow[3] - 128;
int cb = (int)srow[1] - 128;
int r = cr * 359;
int g = -cb * 88 - 128 * cr;
int b = 454 * cb;
int z;
CHANNEL_CLAMP(drow[0], z, y0, b);
CHANNEL_CLAMP(drow[1], z, y0, g);
CHANNEL_CLAMP(drow[2], z, y0, r);
CHANNEL_CLAMP(drow[4], z, y1, b);
CHANNEL_CLAMP(drow[5], z, y1, g);
CHANNEL_CLAMP(drow[6], z, y1, r);
srow += 4;
drow += 8;
}
}
}
void yuyv_to_luma(const uint8_t *src, int src_pitch,
int w, int h,
uint8_t *dst, int dst_pitch)
{
int y;
for (y = 0; y < h; y++) {
int x;
const uint8_t *srow = src + y * src_pitch;
uint8_t *drow = dst + y * dst_pitch;
for (x = 0; x < w; x += 2) {
*(drow++) = srow[0];
*(drow++) = srow[2];
srow += 4;
}
}
}
void rgb32_to_luma(const uint8_t *src, int src_pitch,
int w, int h,
uint8_t *dst, int dst_pitch)
{
int y;
for (y = 0; y < h; y++) {
const uint8_t *rgb32 = src + src_pitch * y;
uint8_t *gray = dst + y * dst_pitch;
int i;
for (i = 0; i < w; i++) {
/* ITU-R colorspace assumed */
int r = (int)rgb32[2];
int g = (int)rgb32[1];
int b = (int)rgb32[0];
int sum = r * 59 + g * 150 + b * 29;
*(gray++) = sum >> 8;
rgb32 += 4;
}
}
}
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