FreeRDP/libfreerdp/primitives/prim_add.c

/* FreeRDP: A Remote Desktop Protocol Client
 * Add operations.
 * vi:ts=4 sw=4:
 *
 * (c) Copyright 2012 Hewlett-Packard Development Company, L.P.
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 */

#include <freerdp/config.h>

#include <stdint.h>

#include <freerdp/types.h>
#include <freerdp/primitives.h>

#include "prim_internal.h"

/* ----------------------------------------------------------------------------
 * 16-bit signed add with saturation (under and over).
 */
static pstatus_t general_add_16s(const INT16* WINPR_RESTRICT pSrc1,
                                 const INT16* WINPR_RESTRICT pSrc2, INT16* WINPR_RESTRICT pDst,
                                 UINT32 len)
{
	while (len--)
	{
		INT32 k = (INT32)(*pSrc1++) + (INT32)(*pSrc2++);

		if (k > INT16_MAX)
			*pDst++ = ((INT16)INT16_MAX);
		else if (k < INT16_MIN)
			*pDst++ = ((INT16)INT16_MIN);
		else
			*pDst++ = (INT16)k;
	}

	return PRIMITIVES_SUCCESS;
}

static pstatus_t general_add_16s_inplace(INT16* WINPR_RESTRICT pSrcDst,
                                         const INT16* WINPR_RESTRICT pSrc, UINT32 len)
{
	while (len--)
	{
		INT32 k = (INT32)(*pSrcDst) + (INT32)(*pSrc++);

		if (k > INT16_MAX)
			*pSrcDst++ = ((INT16)INT16_MAX);
		else if (k < INT16_MIN)
			*pSrcDst++ = ((INT16)INT16_MIN);
		else
			*pSrcDst++ = (INT16)k;
	}

	return PRIMITIVES_SUCCESS;
}

/* ------------------------------------------------------------------------- */
void primitives_init_add(primitives_t* prims)
{
	prims->add_16s = general_add_16s;
	prims->add_16s_inplace = general_add_16s_inplace;
}