/*

  * 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()));

   }

 }