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/*
# RGB / YUV flip/rotate routines
# (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
# This program 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 program 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 program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "libv4lconvert-priv.h"
static void v4lconvert_rotate180_rgbbgr24(const unsigned char *src,
unsigned char *dst, int width, int height)
{
int i;
src += 3 * width * height - 3;
for (i = 0; i < width * height; i++) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst += 3;
src -= 3;
}
}
static void v4lconvert_rotate180_yuv420(const unsigned char *src,
unsigned char *dst, int width, int height)
{
int i;
/* First flip x and y of the Y plane */
src += width * height - 1;
for (i = 0; i < width * height; i++)
*dst++ = *src--;
/* Now flip the U plane */
src += width * height * 5 / 4;
for (i = 0; i < width * height / 4; i++)
*dst++ = *src--;
/* Last flip the V plane */
src += width * height / 2;
for (i = 0; i < width * height / 4; i++)
*dst++ = *src--;
}
static void v4lconvert_rotate90_rgbbgr24(const unsigned char *src,
unsigned char *dst, int destwidth, int destheight)
{
int x, y;
#define srcwidth destheight
#define srcheight destwidth
for (y = 0; y < destheight; y++)
for (x = 0; x < destwidth; x++) {
int offset = ((srcheight - x - 1) * srcwidth + y) * 3;
*dst++ = src[offset++];
*dst++ = src[offset++];
*dst++ = src[offset];
}
}
static void v4lconvert_rotate90_yuv420(const unsigned char *src,
unsigned char *dst, int destwidth, int destheight)
{
int x, y;
/* Y-plane */
for (y = 0; y < destheight; y++)
for (x = 0; x < destwidth; x++) {
int offset = (srcheight - x - 1) * srcwidth + y;
*dst++ = src[offset];
}
/* U-plane */
src += srcwidth * srcheight;
destwidth /= 2;
destheight /= 2;
for (y = 0; y < destheight; y++)
for (x = 0; x < destwidth; x++) {
int offset = (srcheight - x - 1) * srcwidth + y;
*dst++ = src[offset];
}
/* V-plane */
src += srcwidth * srcheight;
for (y = 0; y < destheight; y++)
for (x = 0; x < destwidth; x++) {
int offset = (srcheight - x - 1) * srcwidth + y;
*dst++ = src[offset];
}
}
void v4lconvert_rotate(unsigned char *src, unsigned char *dest,
int width, int height, unsigned int pix_fmt, int rotate)
{
switch (rotate) {
case 0:
break;
case 90:
switch (pix_fmt) {
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
v4lconvert_rotate90_rgbbgr24(src, dest, width, height);
break;
case V4L2_PIX_FMT_YUV420:
v4lconvert_rotate90_yuv420(src, dest, width, height);
break;
}
break;
case 180:
switch (pix_fmt) {
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
v4lconvert_rotate180_rgbbgr24(src, dest, width, height);
break;
case V4L2_PIX_FMT_YUV420:
v4lconvert_rotate180_yuv420(src, dest, width, height);
break;
}
break;
default:
printf("FIXME add %d degrees rotation\n", rotate);
}
}
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