text: /*
   * LIBOIL - Library of Optimized Inner Loops
   * Copyright (c) 2003,2004 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/liboil.h>
  #include <liboil/liboiltest.h>
  #include "jpeg.h"
  
  /**
   * oil_yuv2rgbx_u8:
   * @d_4xn:
   * @src1: Y component
   * @src2: U component
   * @src3: V component
   * @n:
   *
   * Converts YUV pixels to RGB pixels.  Each YUV component is in a
   * separate source array, and are combined and converted to RGB.
   *
   * This function should be replaced by one that makes sense.
   */
  OIL_DEFINE_CLASS (yuv2rgbx_u8,
      "uint8_t *d_4xn, uint8_t *src1, uint8_t *src2, uint8_t *src3, int n");
  /**
   * oil_yuv2rgbx_sub2_u8:
   * @d_4xn:
   * @src1: Y component
   * @src2: U component
   * @src3: V component
   * @n:
   *
   * Converts YUV pixels to RGB pixels.  Each YUV component is in a
   * separate source array, and are combined and converted to RGB.
   * The U and V arrays are subsampled by a factor of 2, so only
   * half of each array is used.
   *
   * This function should be replaced by one that makes sense.
   */
  OIL_DEFINE_CLASS (yuv2rgbx_sub2_u8,
      "uint8_t *d_4xn, uint8_t *src1, uint8_t *src2, uint8_t *src3, int n");
  /**
   * oil_yuv2rgbx_sub4_u8:
   * @d_4xn:
   * @src1: Y component
   * @src2: U component
   * @src3: V component
   * @n:
   *
   * Converts YUV pixels to RGB pixels.  Each YUV component is in a
   * separate source array, and are combined and converted to RGB.
   * The U and V arrays are subsampled by a factor of 4, so only
   * a quarter of each array is used.
   *
   * This function should be replaced by one that makes sense.
   */
  OIL_DEFINE_CLASS (yuv2rgbx_sub4_u8,
      "uint8_t *d_4xn, uint8_t *src1, uint8_t *src2, uint8_t *src3, int n");
  
  #define clamp(x,a,b) clamp_lower(clamp_upper(x,b),a)
  #define clamp_lower(x,a) ((x<a)?(a):(x))
  #define clamp_upper(x,b) ((x>b)?(b):(x))
  
  /* from the JFIF spec */
  #define YUV_TO_R(y,u,v) clamp((y) + 1.402*((v)-128),0,255)
  #define YUV_TO_G(y,u,v) clamp((y) - 0.34414*((u)-128) - 0.71414*((v)-128),0,255)
  #define YUV_TO_B(y,u,v) clamp((y) + 1.772*((u)-128),0,255)
  
  #define YUV_TO_R_INT(y,u,v) clamp(((y)*256 + 358*((v)-128))>>8,0,255)
  #define YUV_TO_G_INT(y,u,v) clamp(((y)*256 - 88*((u)-128) - 183*((v)-128))>>8,0,255)
  #define YUV_TO_B_INT(y,u,v) clamp(((y)*256 + 454*((u)-128))>>8,0,255)
  
  
  static void
  yuv2rgbx_u8_ref (uint8_t *rgbp, uint8_t *yp, uint8_t *up, uint8_t *vp, int n)
  {
  	int i;
  
  	for(i=0;i<n;i++){
  		rgbp[0] = YUV_TO_R(yp[0], up[0], vp[0]);
  		rgbp[1] = YUV_TO_G(yp[0], up[0], vp[0]);
  		rgbp[2] = YUV_TO_B(yp[0], up[0], vp[0]);
  		rgbp[3] = 0;
  		rgbp+=4;
  		yp++;
  		up++;
  		vp++;
  	}
  }
  
  OIL_DEFINE_IMPL_REF (yuv2rgbx_u8_ref, yuv2rgbx_u8);
  
  #ifdef ENABLE_BROKEN_IMPLS
  static void
  yuv2rgbx_u8_int (uint8_t *rgbp, uint8_t *yp, uint8_t *up, uint8_t *vp, int n)
  {
  	int i;
  
  	for(i=0;i<n;i++){
  		rgbp[0] = YUV_TO_R_INT(yp[0], up[0], vp[0]);
  		rgbp[1] = YUV_TO_G_INT(yp[0], up[0], vp[0]);
  		rgbp[2] = YUV_TO_B_INT(yp[0], up[0], vp[0]);
  		rgbp[3] = 0;
  		rgbp+=4;
  		yp++;
  		up++;
  		vp++;
  	}
  }
  
  OIL_DEFINE_IMPL (yuv2rgbx_u8_int, yuv2rgbx_u8);
  #endif
  
  static void
  yuv2rgbx_sub2_u8_ref (uint8_t *rgbp, uint8_t *yp, uint8_t *up, uint8_t *vp, int n)
  {
  	int i;
  
  	for(i=0;i<n/2;i++){
  		rgbp[0] = YUV_TO_R(yp[0], up[0], vp[0]);
  		rgbp[1] = YUV_TO_G(yp[0], up[0], vp[0]);
  		rgbp[2] = YUV_TO_B(yp[0], up[0], vp[0]);
  		rgbp[3] = 0;
  		rgbp+=4;
  		yp++;
  		rgbp[0] = YUV_TO_R(yp[0], up[0], vp[0]);
  		rgbp[1] = YUV_TO_G(yp[0], up[0], vp[0]);
  		rgbp[2] = YUV_TO_B(yp[0], up[0], vp[0]);
  		rgbp[3] = 0;
  		rgbp+=4;
  		yp++;
  		up++;
  		vp++;
  	}
  }
  
  OIL_DEFINE_IMPL_REF (yuv2rgbx_sub2_u8_ref, yuv2rgbx_sub2_u8);
  
  static void
  yuv2rgbx_sub4_u8_ref (uint8_t *rgbp, uint8_t *yp, uint8_t *up, uint8_t *vp, int n)
  {
  	int i;
  
  	for(i=0;i<n/4;i++){
  		rgbp[0] = YUV_TO_R(yp[0], up[0], vp[0]);
  		rgbp[1] = YUV_TO_G(yp[0], up[0], vp[0]);
  		rgbp[2] = YUV_TO_B(yp[0], up[0], vp[0]);
  		rgbp[3] = 0;
  		rgbp+=4;
  		yp++;
  		rgbp[0] = YUV_TO_R(yp[0], up[0], vp[0]);
  		rgbp[1] = YUV_TO_G(yp[0], up[0], vp[0]);
  		rgbp[2] = YUV_TO_B(yp[0], up[0], vp[0]);
  		rgbp[3] = 0;
  		rgbp+=4;
  		yp++;
  		rgbp[0] = YUV_TO_R(yp[0], up[0], vp[0]);
  		rgbp[1] = YUV_TO_G(yp[0], up[0], vp[0]);
  		rgbp[2] = YUV_TO_B(yp[0], up[0], vp[0]);
  		rgbp[3] = 0;
  		rgbp+=4;
  		yp++;
  		rgbp[0] = YUV_TO_R(yp[0], up[0], vp[0]);
  		rgbp[1] = YUV_TO_G(yp[0], up[0], vp[0]);
  		rgbp[2] = YUV_TO_B(yp[0], up[0], vp[0]);
  		rgbp[3] = 0;
  		rgbp+=4;
  		yp++;
  		up++;
  		vp++;
  	}
  }
  
  OIL_DEFINE_IMPL_REF (yuv2rgbx_sub4_u8_ref, yuv2rgbx_sub4_u8);
  
  