mpv/libvo/fastmemcpy.h

/*
 * This file is part of MPlayer.
 *
 * MPlayer 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.
 *
 * MPlayer 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 MPlayer; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef MPLAYER_FASTMEMCPY_H
#define MPLAYER_FASTMEMCPY_H

#include "config.h"
#include <inttypes.h>
#include <string.h>
#include <stddef.h>

// meaningless ancient alias
#define fast_memcpy memcpy

#define memcpy_pic(d, s, b, h, ds, ss) memcpy_pic2(d, s, b, h, ds, ss, 0)
#define my_memcpy_pic(d, s, b, h, ds, ss) memcpy_pic2(d, s, b, h, ds, ss, 1)

/**
 * \param limit2width always skip data between end of line and start of next
 *                    instead of copying the full block when strides are the same
 */
static inline void * memcpy_pic2(void * dst, const void * src,
                                 int bytesPerLine, int height,
                                 int dstStride, int srcStride, int limit2width)
{
	int i;
	void *retval=dst;

	if(!limit2width && dstStride == srcStride)
	{
		if (srcStride < 0) {
	    		src = (uint8_t*)src + (height-1)*srcStride;
	    		dst = (uint8_t*)dst + (height-1)*dstStride;
	    		srcStride = -srcStride;
		}

		memcpy(dst, src, srcStride*height);
	}
	else
	{
		for(i=0; i<height; i++)
		{
			memcpy(dst, src, bytesPerLine);
			src = (uint8_t*)src + srcStride;
			dst = (uint8_t*)dst + dstStride;
		}
	}

	return retval;
}

static inline void memset_pic(void *dst, int fill, int bytesPerLine, int height,
                              int stride)
{
    if (bytesPerLine == stride) {
        memset(dst, fill, stride * height);
    } else {
        for (int i = 0; i < height; i++) {
            memset(dst, fill, bytesPerLine);
            dst = (uint8_t *)dst + stride;
        }
    }
}

#endif /* MPLAYER_FASTMEMCPY_H */