cpython/Modules/yuvconvert.c

#include "yuv.h"

void
yuv_sv411_to_cl422dc(int invert, void *data, void *yuv, int width, int height)
{
	struct yuv411 *in = data;
	struct yuv422 *out_even = yuv;
	struct yuv422 *out_odd = out_even + width / 2;
	int i, j;		/* counters */

	for (i = height / 2; i--; ) {
		for (j = width / 4; j--; ) {
			YUV422_Y0(*out_even) = YUV411_Y00(*in);
			YUV422_U0(*out_even) = YUV411_U00(*in);
			YUV422_V0(*out_even) = YUV411_V00(*in);
			YUV422_Y1(*out_even) = YUV411_Y01(*in);
			out_even++;
			YUV422_Y0(*out_even) = YUV411_Y02(*in);
			YUV422_U0(*out_even) = YUV411_U02(*in);
			YUV422_V0(*out_even) = YUV411_V02(*in);
			YUV422_Y1(*out_even) = YUV411_Y03(*in);
			out_even++;
			YUV422_Y0(*out_odd) = YUV411_Y10(*in);
			YUV422_U0(*out_odd) = YUV411_U10(*in);
			YUV422_V0(*out_odd) = YUV411_V10(*in);
			YUV422_Y1(*out_odd) = YUV411_Y11(*in);
			out_odd++;
			YUV422_Y0(*out_odd) = YUV411_Y12(*in);
			YUV422_U0(*out_odd) = YUV411_U12(*in);
			YUV422_V0(*out_odd) = YUV411_V12(*in);
			YUV422_Y1(*out_odd) = YUV411_Y13(*in);
			out_odd++;
			in++;
		}
		out_even += width / 2;
		out_odd += width / 2;
	}
}

void
yuv_sv411_to_cl422dc_quartersize(int invert, void *data, void *yuv,
				 int width, int height)
{
	int w4 = width / 4;	/* quarter of width is used often */
	struct yuv411 *in_even = data;
	struct yuv411 *in_odd = in_even + w4;
	struct yuv422 *out_even = yuv;
	struct yuv422 *out_odd = out_even + w4;
	int i, j;		/* counters */
	int u, v;		/* U and V values */

	for (i = height / 4; i--; ) {
		for (j = w4; j--; ) {
			u = YUV411_U00(*in_even);
			v = YUV411_V00(*in_even);

			YUV422_Y0(*out_even) = YUV411_Y00(*in_even);
			YUV422_U0(*out_even) = u;
			YUV422_V0(*out_even) = v;
			YUV422_Y1(*out_even) = YUV411_Y02(*in_even);

			YUV422_Y0(*out_odd) = YUV411_Y10(*in_odd);
			YUV422_U0(*out_odd) = u;
			YUV422_V0(*out_odd) = v;
			YUV422_Y1(*out_odd) = YUV411_Y12(*in_odd);

			in_even++;
			in_odd++;
			out_even++;
			out_odd++;
		}
		in_even += w4;
		in_odd += w4;
		out_even += w4;
		out_odd += w4;
	}
}

void
yuv_sv411_to_cl422dc_sixteenthsize(int invert, void *data, void *yuv,
				   int width, int height)
{
	int w4_3 = 3 * width / 4; /* three quarters of width is used often */
	int w8 = width / 8;	/* and so is one eighth */
	struct yuv411 *in_even = data;
	struct yuv411 *in_odd = in_even + width / 2;
	struct yuv422 *out_even = yuv;
	struct yuv422 *out_odd = out_even + w8;
	int i, j;		/* counters */
	int u, v;		/* U and V values */

	for (i = height / 8; i--; ) {
		for (j = w8; j--; ) {
			u = YUV411_U00(in_even[0]);
			v = YUV411_V00(in_even[0]);

			YUV422_Y0(*out_even) = YUV411_Y00(in_even[0]);
			YUV422_U0(*out_even) = u;
			YUV422_V0(*out_even) = v;
			YUV422_Y1(*out_even) = YUV411_Y00(in_even[1]);

			YUV422_Y0(*out_odd) = YUV411_Y00(in_odd[0]);
			YUV422_U0(*out_odd) = u;
			YUV422_V0(*out_odd) = v;
			YUV422_Y1(*out_odd) = YUV411_Y00(in_even[1]);

			in_even += 2;
			in_odd += 2;
			out_even++;
			out_odd++;
		}
		in_even += w4_3;
		in_odd += w4_3;
		out_even += w8;
		out_odd += w8;
	}
}