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/*
# RGB and YUV crop 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 <string.h>
#include "libv4lconvert-priv.h"
static void v4lconvert_reduceandcrop_rgbbgr24(
unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
int x, y;
int startx = src_fmt->fmt.pix.width / 2 - dest_fmt->fmt.pix.width;
int starty = src_fmt->fmt.pix.height / 2 - dest_fmt->fmt.pix.height;
src += starty * src_fmt->fmt.pix.bytesperline + 3 * startx;
for (y = 0; y < dest_fmt->fmt.pix.height; y++) {
unsigned char *mysrc = src;
for (x = 0; x < dest_fmt->fmt.pix.width; x++) {
*(dest++) = *(mysrc++);
*(dest++) = *(mysrc++);
*(dest++) = *(mysrc++);
mysrc += 3; /* skip one pixel */
}
src += 2 * src_fmt->fmt.pix.bytesperline; /* skip one line */
}
}
static void v4lconvert_crop_rgbbgr24(unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
int x;
int startx = (src_fmt->fmt.pix.width - dest_fmt->fmt.pix.width) / 2;
int starty = (src_fmt->fmt.pix.height - dest_fmt->fmt.pix.height) / 2;
src += starty * src_fmt->fmt.pix.bytesperline + 3 * startx;
for (x = 0; x < dest_fmt->fmt.pix.height; x++) {
memcpy(dest, src, dest_fmt->fmt.pix.width * 3);
src += src_fmt->fmt.pix.bytesperline;
dest += dest_fmt->fmt.pix.bytesperline;
}
}
static void v4lconvert_reduceandcrop_yuv420(
unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
int x,y;
int dest_height_half = dest_fmt->fmt.pix.height / 2;
int dest_width_half = dest_fmt->fmt.pix.width / 2;
int startx = (src_fmt->fmt.pix.width / 2 - dest_fmt->fmt.pix.width) & ~1;
int starty = (src_fmt->fmt.pix.height / 2 - dest_fmt->fmt.pix.height) & ~1;
unsigned char *mysrc, *mysrc2;
/* Y */
mysrc = src + starty * src_fmt->fmt.pix.bytesperline + startx;
for (y = 0; y < dest_fmt->fmt.pix.height; y++){
mysrc2 = mysrc;
for (x = 0; x < dest_fmt->fmt.pix.width; x++){
*(dest++) = *mysrc2;
mysrc2 += 2; /* skip one pixel */
}
mysrc += 2 * src_fmt->fmt.pix.bytesperline; /* skip one line */
}
/* U */
mysrc = src + src_fmt->fmt.pix.height * src_fmt->fmt.pix.bytesperline +
(starty / 2) * src_fmt->fmt.pix.bytesperline / 2 + startx / 2;
for (y = 0; y < dest_height_half; y++){
mysrc2 = mysrc;
for (x = 0; x < dest_width_half; x++){
*(dest++) = *mysrc2;
mysrc2 += 2; /* skip one pixel */
}
mysrc += src_fmt->fmt.pix.bytesperline ; /* skip one line */
}
/* V */
mysrc = src + src_fmt->fmt.pix.height * src_fmt->fmt.pix.bytesperline * 5 / 4
+ (starty / 2) * src_fmt->fmt.pix.bytesperline / 2 + startx / 2;
for (y = 0; y < dest_height_half; y++){
mysrc2 = mysrc;
for (x = 0; x < dest_width_half; x++){
*(dest++) = *mysrc2;
mysrc2 += 2; /* skip one pixel */
}
mysrc += src_fmt->fmt.pix.bytesperline ; /* skip one line */
}
}
static void v4lconvert_crop_yuv420(unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
int x;
int startx = ((src_fmt->fmt.pix.width - dest_fmt->fmt.pix.width) / 2) & ~1;
int starty = ((src_fmt->fmt.pix.height - dest_fmt->fmt.pix.height) / 2) & ~1;
unsigned char *mysrc = src + starty * src_fmt->fmt.pix.bytesperline + startx;
/* Y */
for (x = 0; x < dest_fmt->fmt.pix.height; x++) {
memcpy(dest, mysrc, dest_fmt->fmt.pix.width);
mysrc += src_fmt->fmt.pix.bytesperline;
dest += dest_fmt->fmt.pix.bytesperline;
}
/* U */
mysrc = src + src_fmt->fmt.pix.height * src_fmt->fmt.pix.bytesperline +
(starty / 2) * src_fmt->fmt.pix.bytesperline / 2 + startx / 2;
for (x = 0; x < dest_fmt->fmt.pix.height / 2; x++) {
memcpy(dest, mysrc, dest_fmt->fmt.pix.width / 2);
mysrc += src_fmt->fmt.pix.bytesperline / 2;
dest += dest_fmt->fmt.pix.bytesperline / 2;
}
/* V */
mysrc = src + src_fmt->fmt.pix.height * src_fmt->fmt.pix.bytesperline * 5 / 4
+ (starty / 2) * src_fmt->fmt.pix.bytesperline / 2 + startx / 2;
for (x = 0; x < dest_fmt->fmt.pix.height / 2; x++) {
memcpy(dest, mysrc, dest_fmt->fmt.pix.width / 2);
mysrc += src_fmt->fmt.pix.bytesperline / 2;
dest += dest_fmt->fmt.pix.bytesperline / 2;
}
}
/* Ok, so this is not really cropping, but more the reverse, whatever */
static void v4lconvert_add_border_rgbbgr24(
unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
int y;
int borderx = (dest_fmt->fmt.pix.width - src_fmt->fmt.pix.width) / 2;
int bordery = (dest_fmt->fmt.pix.height - src_fmt->fmt.pix.height) / 2;
for (y = 0; y < bordery; y++) {
memset(dest, 0, dest_fmt->fmt.pix.width * 3);
dest += dest_fmt->fmt.pix.bytesperline;
}
for (y = 0; y < src_fmt->fmt.pix.height; y++) {
memset(dest, 0, borderx * 3);
dest += borderx * 3;
memcpy(dest, src, src_fmt->fmt.pix.width * 3);
src += src_fmt->fmt.pix.bytesperline;
dest += src_fmt->fmt.pix.width * 3;
memset(dest, 0, borderx * 3);
dest += dest_fmt->fmt.pix.bytesperline -
(borderx + src_fmt->fmt.pix.width) * 3;
}
for (y = 0; y < bordery; y++) {
memset(dest, 0, dest_fmt->fmt.pix.width * 3);
dest += dest_fmt->fmt.pix.bytesperline;
}
}
static void v4lconvert_add_border_yuv420(
unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
int y;
int borderx = ((dest_fmt->fmt.pix.width - src_fmt->fmt.pix.width) / 2) & ~1;
int bordery = ((dest_fmt->fmt.pix.height - src_fmt->fmt.pix.height) / 2) & ~1;
/* Y */
for (y = 0; y < bordery; y++) {
memset(dest, 16, dest_fmt->fmt.pix.width);
dest += dest_fmt->fmt.pix.bytesperline;
}
for (y = 0; y < src_fmt->fmt.pix.height; y++) {
memset(dest, 16, borderx);
dest += borderx;
memcpy(dest, src, src_fmt->fmt.pix.width);
src += src_fmt->fmt.pix.bytesperline;
dest += src_fmt->fmt.pix.width;
memset(dest, 16, borderx);
dest += dest_fmt->fmt.pix.bytesperline -
(borderx + src_fmt->fmt.pix.width);
}
for (y = 0; y < bordery; y++) {
memset(dest, 16, dest_fmt->fmt.pix.width);
dest += dest_fmt->fmt.pix.bytesperline;
}
/* U */
for (y = 0; y < bordery / 2; y++) {
memset(dest, 128, dest_fmt->fmt.pix.width / 2);
dest += dest_fmt->fmt.pix.bytesperline / 2;
}
for (y = 0; y < src_fmt->fmt.pix.height / 2; y++) {
memset(dest, 128, borderx / 2);
dest += borderx / 2;
memcpy(dest, src, src_fmt->fmt.pix.width / 2);
src += src_fmt->fmt.pix.bytesperline / 2;
dest += src_fmt->fmt.pix.width / 2;
memset(dest, 128, borderx / 2);
dest += (dest_fmt->fmt.pix.bytesperline -
(borderx + src_fmt->fmt.pix.width)) / 2;
}
for (y = 0; y < bordery / 2; y++) {
memset(dest, 128, dest_fmt->fmt.pix.width / 2);
dest += dest_fmt->fmt.pix.bytesperline / 2;
}
/* V */
for (y = 0; y < bordery / 2; y++) {
memset(dest, 128, dest_fmt->fmt.pix.width / 2);
dest += dest_fmt->fmt.pix.bytesperline / 2;
}
for (y = 0; y < src_fmt->fmt.pix.height / 2; y++) {
memset(dest, 128, borderx / 2);
dest += borderx / 2;
memcpy(dest, src, src_fmt->fmt.pix.width / 2);
src += src_fmt->fmt.pix.bytesperline / 2;
dest += src_fmt->fmt.pix.width / 2;
memset(dest, 128, borderx / 2);
dest += (dest_fmt->fmt.pix.bytesperline -
(borderx + src_fmt->fmt.pix.width)) / 2;
}
for (y = 0; y < bordery / 2; y++) {
memset(dest, 128, dest_fmt->fmt.pix.width / 2);
dest += dest_fmt->fmt.pix.bytesperline / 2;
}
}
void v4lconvert_crop(unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
switch (dest_fmt->fmt.pix.pixelformat) {
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
if (src_fmt->fmt.pix.width <= dest_fmt->fmt.pix.width &&
src_fmt->fmt.pix.height <= dest_fmt->fmt.pix.height)
v4lconvert_add_border_rgbbgr24(src, dest, src_fmt, dest_fmt);
else if (src_fmt->fmt.pix.width >= 2 * dest_fmt->fmt.pix.width &&
src_fmt->fmt.pix.height >= 2 * dest_fmt->fmt.pix.height)
v4lconvert_reduceandcrop_rgbbgr24(src, dest, src_fmt, dest_fmt);
else
v4lconvert_crop_rgbbgr24(src, dest, src_fmt, dest_fmt);
break;
case V4L2_PIX_FMT_YUV420:
case V4L2_PIX_FMT_YVU420:
if (src_fmt->fmt.pix.width <= dest_fmt->fmt.pix.width &&
src_fmt->fmt.pix.height <= dest_fmt->fmt.pix.height)
v4lconvert_add_border_yuv420(src, dest, src_fmt, dest_fmt);
else if (src_fmt->fmt.pix.width >= 2 * dest_fmt->fmt.pix.width &&
src_fmt->fmt.pix.height >= 2 * dest_fmt->fmt.pix.height)
v4lconvert_reduceandcrop_yuv420(src, dest, src_fmt, dest_fmt);
else
v4lconvert_crop_yuv420(src, dest, src_fmt, dest_fmt);
break;
}
}
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