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/* Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com>
*
* 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 2.1 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "mimic-private.h"
#define RED_INDEX_1 0
#define GREEN_INDEX_1 1
#define BLUE_INDEX_1 2
#define RED_INDEX_2 3
#define GREEN_INDEX_2 4
#define BLUE_INDEX_2 5
/*
* _rgb_to_yuv
*
* Internal helper-function used to convert an image
* from RGB 24-bpp packed-pixel to YUV420 planar.
*/
void _rgb_to_yuv(const guchar *input_rgb,
guchar *output_y,
guchar *output_cb,
guchar *output_cr,
gint width,
gint height)
{
gint y, x;
for (y = 0; y < height; y += 2) {
const guchar *src1, *src2;
guchar *dst1, *dst2, *dst3, *dst4;
gint num_cols;
src1 = input_rgb + ((height - 1 - y) * width * 3);
src2 = input_rgb + ((height - 2 - y) * width * 3);
dst1 = output_y + (y * width);
dst2 = output_y + ((y + 1) * width);
dst3 = output_cb + ((y / 2) * (width / 2));
dst4 = output_cr + ((y / 2) * (width / 2));
num_cols = width / 2;
for (x = 0; x < num_cols; x++) {
gint expr1, expr2, expr3, expr4, expr5, v;
expr1 = (src1[BLUE_INDEX_1] * 19595) + (src1[GREEN_INDEX_1] * 38470) + (src1[RED_INDEX_1] * 7471);
expr2 = (src1[BLUE_INDEX_2] * 19595) + (src1[GREEN_INDEX_2] * 38470) + (src1[RED_INDEX_2] * 7471);
expr3 = (src2[BLUE_INDEX_1] * 19595) + (src2[GREEN_INDEX_1] * 38470) + (src2[RED_INDEX_1] * 7471);
expr4 = (src2[BLUE_INDEX_2] * 19595) + (src2[GREEN_INDEX_2] * 38470) + (src2[RED_INDEX_2] * 7471);
expr5 = expr1 + expr2 + expr3 + expr4;
dst1[0] = expr1 >> 16;
dst1[1] = expr2 >> 16;
dst2[0] = expr3 >> 16;
dst2[1] = expr4 >> 16;
v = (((src1[BLUE_INDEX_1] + src1[BLUE_INDEX_2] + src2[BLUE_INDEX_1] + src2[BLUE_INDEX_2]) << 16) - expr5 + 131071) >> 16;
dst3[0] = _clamp_value(((v * 57475) >> 18) + 128);
v = (((src1[RED_INDEX_1] + src1[RED_INDEX_2] + src2[RED_INDEX_1] + src2[RED_INDEX_2]) << 16) - expr5 + 131071) >> 16;
dst4[0] = ((v * 32244) >> 18) + 128;
src1 += 6;
src2 += 6;
dst1 += 2;
dst2 += 2;
dst3++;
dst4++;
}
}
}
/*
* _yuv_to_rgb
*
* Internal helper-function used to convert an image
* from YUV420 planar to RGB 24-bpp packed-pixel.
*/
void _yuv_to_rgb(const guchar *input_y,
const guchar *input_cb,
const guchar *input_cr,
guchar *output_rgb,
guint width,
guint height)
{
const guchar *src_y, *src_cb, *src_cr;
guchar *dst_rgb;
guint i, j, rgb_stride;
src_y = input_y;
src_cb = input_cb;
src_cr = input_cr;
rgb_stride = width * 3;
dst_rgb = output_rgb + (rgb_stride * (height - 1));
for (i = 0; i < height; i++) {
const guchar *p_y, *p_cb, *p_cr;
guchar *p_rgb;
p_y = src_y;
p_cb = src_cb;
p_cr = src_cr;
p_rgb = dst_rgb;
for (j = 0; j < width; j++) {
gint v;
v = ((p_y[0] * 65536) + ((p_cr[0] - 128) * 133169)) / 65536;
p_rgb[0] = _clamp_value(v);
v = ((p_y[0] * 65536) - ((p_cr[0] - 128) * 25821) - ((p_cb[0] - 128) * 38076)) / 65536;
p_rgb[1] = _clamp_value(v);
v = ((p_y[0] * 65536) + ((p_cb[0] - 128) * 74711)) / 65536;
p_rgb[2] = _clamp_value(v);
p_y++;
if ((j + 1) % 2 == 0) {
p_cb++;
p_cr++;
}
p_rgb += 3;
}
src_y += width;
if ((i + 1) % 2 == 0) {
src_cb += (width + 1) / 2;
src_cr += (width + 1) / 2;
}
dst_rgb -= rgb_stride;
}
}
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