/*

 * LIBOIL - Library of Optimized Inner Loops

 * Copyright (c) 2005 David A. Schleef <ds@schleef.org>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,

 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <liboil/liboilrandom.h>

#include "liboil/liboilcolorspace.h"

#include <stdlib.h>

/**

 * SECTION:liboilrandom

 * @title: Random Number Generation

 * @short_description: Random number generation

 */

static void

_oil_random_bits (void *dest, int n)

{

  int i;

  uint8_t *d = dest;

  for(i=0;i<n;i++){

    d[i] = (rand()>>16);

  }

}

/**

 * oil_random_s32:

 * @dest:

 * @n:

 *

 * Writes random values in the range [-(1<<31), (1<<31)-1] to the

 * destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_s32(oil_type_s32 *dest, int n)

{

  _oil_random_bits (dest, n*4);

}

/**

 * oil_random_s64:

 *

 * Writes random values in the range [-(1<<63), (1<<63)-1] to the

 * destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_s64 (oil_type_s64 *dest, int n)

{

  _oil_random_bits (dest, n*8);

}

/**

 * oil_random_s16:

 *

 * Writes random values in the range [-(1<<15), (1<<15)-1] to the

 * destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_s16 (oil_type_s16 *dest, int n)

{

  _oil_random_bits (dest, n*2);

}

/**

 * oil_random_s8:

 *

 * Writes random values in the range [-(1<<7), (1<<7)-1] to the

 * destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_s8 (oil_type_s8 *dest, int n)

{

  _oil_random_bits (dest, n);

}

/**

 * oil_random_u32:

 *

 * Writes random values in the range [0, (1<<32)-1] to the

 * destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_u32 (oil_type_u32 *dest, int n)

{

  _oil_random_bits (dest, n*4);

}

/**

 * oil_random_u64:

 *

 * Writes random values in the range [0, (1<<64)-1] to the

 * destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_u64 (oil_type_u64 *dest, int n)

{

  _oil_random_bits (dest, n*8);

}

/**

 * oil_random_u16:

 *

 * Writes random values in the range [0, (1<<16)-1] to the

 * destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_u16 (oil_type_u16 *dest, int n)

{

  _oil_random_bits (dest, n*2);

}

/**

 * oil_random_u8:

 *

 * Writes random values in the range [0, (1<<8)-1] to the

 * destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_u8 (oil_type_u8 *dest, int n)

{

  _oil_random_bits (dest, n);

}

/**

 * oil_random_f64:

 *

 * Writes random double-precision floating point values in the

 * range [0, 1.0) to the destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_f64 (oil_type_f64 *dest, int n)

{

  int i;

  for(i=0;i<n;i++){

    dest[i] = (((rand()/(RAND_MAX+1.0))+rand())/(RAND_MAX+1.0));

  }

}

/**

 * oil_random_f32:

 *

 * Writes random single-precision floating point values in the

 * range [0, 1.0) to the destination array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_f32 (oil_type_f32 *dest, int n)

{

  int i;

  for(i=0;i<n;i++){

    dest[i] = (rand()/(RAND_MAX+1.0));

  }

}

/**

 * oil_random_alpha:

 *

 * Writes random values in the range [0, 255] to the destination

 * array suitable for alpha values.  This is similar to oil_random_u8(),

 * except the values 0 and 255 are strongly favored.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_alpha(uint8_t *dest, int n)

{

  int i;

  int x;

  for(i=0;i<n;i++){

    x = ((rand()>>8) & 0x1ff) - 0x80;

    if (x<0) x = 0;

    if (x>255) x = 255;

    dest[i] = x;

  }

}

/**

 * oil_random_argb:

 * @dest: destination array.

 * @n: number of values to write.

 *

 * Creates valid random RGBA values and places them in the destination

 * array.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

oil_random_argb(uint32_t *dest, int n)

{

  int i;

  int x;

  for(i=0;i<n;i++){

    x = ((rand()>>8) & 0x1ff) - 0x80;

    if (x<0) x = 0;

    if (x>255) x = 255;

    dest[i] = oil_argb_noclamp(x,

        oil_muldiv_255(x,oil_rand_u8()),

        oil_muldiv_255(x,oil_rand_u8()),

        oil_muldiv_255(x,oil_rand_u8()));

  }

}