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/*******************************************************************************
# uvcview: Sdl video Usb Video Class grabber . #
#This package work with the Logitech UVC based webcams with the mjpeg feature. #
#All the decoding is in user space with the embedded jpeg decoder #
#. #
# Copyright (C) 2005 2006 Laurent Pinchart && Michel Xhaard #
# #
# This program is free software; you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation; either version 2 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 General Public License for more details. #
# #
# You should have received a copy of the GNU 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <string.h>
#include "gui.h"
#include "utils.h"
#include "button.h"
#define ADDRESSE(x,y,w) (((y)*(w))+(x))
unsigned char *YUYVbutt = NULL;
typedef struct YUYV {
unsigned char Y0;
unsigned char U0;
} YUYV;
/* Each pixels in the resulting figure need to be set. For each one take the nearest available in the original surface
If the last Chroma component is U take a V else take U by moving the index in the nearest pixel from the left
This routine only deal with X axis you need to make the original picture with the good height */
static int resize(unsigned char *INbuff, unsigned char *OUTbuff,
int Owidth, int Oheight, int width, int height)
{
int rx;
int xscale;
int x, y;
int Cc, lastCc;
YUYV *input = (YUYV *) INbuff;
YUYV *output = (YUYV *) OUTbuff;
if (!width || !height)
return -1;
/* at start Cc mean a U component so LastCc should be a V */
lastCc = 1;
xscale = (Owidth << 16) / width;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
rx = x * xscale >> 16;
if (((2 * rx + 1) & 0x03) == 3)
Cc = 1; // find V component
else
Cc = 0;
if (lastCc == Cc) {
/* no Chroma interleave correct by moving the index */
rx -= 1;
Cc = !Cc;
}
memcpy(output++, &input[ADDRESSE((int) rx, (int) y, Owidth)],
sizeof(YUYV));
lastCc = Cc;
}
}
return 0;
}
int creatButt(int width, int height)
{
int wOrg = 0;
int hOrg = 0;
jpeg_decode(&YUYVbuttOrg, bouttons, &wOrg, &hOrg);
if (wOrg != BUTTWIDTH || hOrg != BUTTHEIGHT) {
printf(" alloc jpeg Button fail !!\n");
goto err;
}
YUYVbutt = (unsigned char *) calloc(1, width * height << 1);
if (!YUYVbutt) {
printf(" alloc Button fail !!\n");
goto err;
}
if (resize(YUYVbuttOrg, YUYVbutt, BUTTWIDTH, BUTTHEIGHT, width, height)
< 0) {
printf(" resize Button fail !!\n");
goto err;
}
return 0;
err:
exit(0);
}
int destroyButt(void)
{
free(YUYVbutt);
YUYVbutt = NULL;
free(YUYVbuttOrg);
YUYVbuttOrg = NULL;
}
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