vbagx/source/vba/interp.h

/*
 * This file is part of the Advance project.
 *
 * Copyright (C) 2003 Andrea Mazzoleni
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * In addition, as a special exception, Andrea Mazzoleni
 * gives permission to link the code of this program with
 * the MAME library (or with modified versions of MAME that use the
 * same license as MAME), and distribute linked combinations including
 * the two.  You must obey the GNU General Public License in all
 * respects for all of the code used other than MAME.  If you modify
 * this file, you may extend this exception to your version of the
 * file, but you are not obligated to do so.  If you do not wish to
 * do so, delete this exception statement from your version.
 */

#ifndef __INTERP_H
#define __INTERP_H

/***************************************************************************/
/* Basic types */

/***************************************************************************/
/* interpolation */

static unsigned interp_mask[2];
static unsigned interp_bits_per_pixel;

#define INTERP_16_MASK_1(v) (v & interp_mask[0])
#define INTERP_16_MASK_2(v) (v & interp_mask[1])

static inline u16 interp_16_521(u16 p1, u16 p2, u16 p3)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*5 + INTERP_16_MASK_1(p2)*2 + INTERP_16_MASK_1(p3)*1) / 8)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*5 + INTERP_16_MASK_2(p2)*2 + INTERP_16_MASK_2(p3)*1) / 8);
}

static inline u16 interp_16_332(u16 p1, u16 p2, u16 p3)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*3 + INTERP_16_MASK_1(p2)*3 + INTERP_16_MASK_1(p3)*2) / 8)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*3 + INTERP_16_MASK_2(p2)*3 + INTERP_16_MASK_2(p3)*2) / 8);
}

static inline u16 interp_16_611(u16 p1, u16 p2, u16 p3)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*6 + INTERP_16_MASK_1(p2) + INTERP_16_MASK_1(p3)) / 8)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*6 + INTERP_16_MASK_2(p2) + INTERP_16_MASK_2(p3)) / 8);
}

static inline u16 interp_16_71(u16 p1, u16 p2)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*7 + INTERP_16_MASK_1(p2)) / 8)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*7 + INTERP_16_MASK_2(p2)) / 8);
}

static inline u16 interp_16_211(u16 p1, u16 p2, u16 p3)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*2 + INTERP_16_MASK_1(p2) + INTERP_16_MASK_1(p3)) / 4)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*2 + INTERP_16_MASK_2(p2) + INTERP_16_MASK_2(p3)) / 4);
}

static inline u16 interp_16_772(u16 p1, u16 p2, u16 p3)
{
  return INTERP_16_MASK_1(((INTERP_16_MASK_1(p1) + INTERP_16_MASK_1(p2))*7 + INTERP_16_MASK_1(p3)*2) / 16)
         | INTERP_16_MASK_2(((INTERP_16_MASK_2(p1) + INTERP_16_MASK_2(p2))*7 + INTERP_16_MASK_2(p3)*2) / 16);
}

static inline u16 interp_16_11(u16 p1, u16 p2)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1) + INTERP_16_MASK_1(p2)) / 2)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1) + INTERP_16_MASK_2(p2)) / 2);
}

static inline u16 interp_16_31(u16 p1, u16 p2)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*3 + INTERP_16_MASK_1(p2)) / 4)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*3 + INTERP_16_MASK_2(p2)) / 4);
}

static inline u16 interp_16_1411(u16 p1, u16 p2, u16 p3)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*14 + INTERP_16_MASK_1(p2) + INTERP_16_MASK_1(p3)) / 16)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*14 + INTERP_16_MASK_2(p2) + INTERP_16_MASK_2(p3)) / 16);
}

static inline u16 interp_16_431(u16 p1, u16 p2, u16 p3)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*4 + INTERP_16_MASK_1(p2)*3 + INTERP_16_MASK_1(p3)) / 8)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*4 + INTERP_16_MASK_2(p2)*3 + INTERP_16_MASK_2(p3)) / 8);
}

static inline u16 interp_16_53(u16 p1, u16 p2)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*5 + INTERP_16_MASK_1(p2)*3) / 8)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*5 + INTERP_16_MASK_2(p2)*3) / 8);
}

static inline u16 interp_16_151(u16 p1, u16 p2)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*15 + INTERP_16_MASK_1(p2)) / 16)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*15 + INTERP_16_MASK_2(p2)) / 16);
}

static inline u16 interp_16_97(u16 p1, u16 p2)
{
  return INTERP_16_MASK_1((INTERP_16_MASK_1(p1)*9 + INTERP_16_MASK_1(p2)*7) / 16)
         | INTERP_16_MASK_2((INTERP_16_MASK_2(p1)*9 + INTERP_16_MASK_2(p2)*7) / 16);
}

#define INTERP_32_MASK_1(v) (v & 0xFF00FF)
#define INTERP_32_MASK_2(v) (v & 0x00FF00)

static inline u32 interp_32_521(u32 p1, u32 p2, u32 p3)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*5 + INTERP_32_MASK_1(p2)*2 + INTERP_32_MASK_1(p3)*1) / 8)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*5 + INTERP_32_MASK_2(p2)*2 + INTERP_32_MASK_2(p3)*1) / 8);
}

static inline u32 interp_32_332(u32 p1, u32 p2, u32 p3)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*3 + INTERP_32_MASK_1(p2)*3 + INTERP_32_MASK_1(p3)*2) / 8)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*3 + INTERP_32_MASK_2(p2)*3 + INTERP_32_MASK_2(p3)*2) / 8);
}

static inline u32 interp_32_211(u32 p1, u32 p2, u32 p3)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*2 + INTERP_32_MASK_1(p2) + INTERP_32_MASK_1(p3)) / 4)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*2 + INTERP_32_MASK_2(p2) + INTERP_32_MASK_2(p3)) / 4);
}

static inline u32 interp_32_611(u32 p1, u32 p2, u32 p3)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*6 + INTERP_32_MASK_1(p2) + INTERP_32_MASK_1(p3)) / 8)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*6 + INTERP_32_MASK_2(p2) + INTERP_32_MASK_2(p3)) / 8);
}

static inline u32 interp_32_71(u32 p1, u32 p2)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*7 + INTERP_32_MASK_1(p2)) / 8)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*7 + INTERP_32_MASK_2(p2)) / 8);
}

static inline u32 interp_32_772(u32 p1, u32 p2, u32 p3)
{
  return INTERP_32_MASK_1(((INTERP_32_MASK_1(p1) + INTERP_32_MASK_1(p2))*7 + INTERP_32_MASK_1(p3)*2) / 16)
         | INTERP_32_MASK_2(((INTERP_32_MASK_2(p1) + INTERP_32_MASK_2(p2))*7 + INTERP_32_MASK_2(p3)*2) / 16);
}

static inline u32 interp_32_11(u32 p1, u32 p2)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1) + INTERP_32_MASK_1(p2)) / 2)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1) + INTERP_32_MASK_2(p2)) / 2);
}

static inline u32 interp_32_31(u32 p1, u32 p2)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*3 + INTERP_32_MASK_1(p2)) / 4)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*3 + INTERP_32_MASK_2(p2)) / 4);
}

static inline u32 interp_32_1411(u32 p1, u32 p2, u32 p3)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*14 + INTERP_32_MASK_1(p2) + INTERP_32_MASK_1(p3)) / 16)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*14 + INTERP_32_MASK_2(p2) + INTERP_32_MASK_2(p3)) / 16);
}

static inline u32 interp_32_431(u32 p1, u32 p2, u32 p3)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*4 + INTERP_32_MASK_1(p2)*3 + INTERP_32_MASK_1(p3)) / 8)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*4 + INTERP_32_MASK_2(p2)*3 + INTERP_32_MASK_2(p3)) / 8);
}

static inline u32 interp_32_53(u32 p1, u32 p2)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*5 + INTERP_32_MASK_1(p2)*3) / 8)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*5 + INTERP_32_MASK_2(p2)*3) / 8);
}

static inline u32 interp_32_151(u32 p1, u32 p2)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*15 + INTERP_32_MASK_1(p2)) / 16)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*15 + INTERP_32_MASK_2(p2)) / 16);
}

static inline u32 interp_32_97(u32 p1, u32 p2)
{
  return INTERP_32_MASK_1((INTERP_32_MASK_1(p1)*9 + INTERP_32_MASK_1(p2)*7) / 16)
         | INTERP_32_MASK_2((INTERP_32_MASK_2(p1)*9 + INTERP_32_MASK_2(p2)*7) / 16);
}

/***************************************************************************/
/* diff */

#define INTERP_Y_LIMIT (0x30*4)
#define INTERP_U_LIMIT (0x07*4)
#define INTERP_V_LIMIT (0x06*8)

static int interp_16_diff(u16 p1, u16 p2)
{
  int r, g, b;
  int y, u, v;

  if (p1 == p2)
    return 0;

  if (interp_bits_per_pixel == 16)
    {
      b = (int)((p1 & 0x1F) - (p2 & 0x1F)) << 3;
      g = (int)((p1 & 0x7E0) - (p2 & 0x7E0)) >> 3;
      r = (int)((p1 & 0xF800) - (p2 & 0xF800)) >> 8;
    }
  else
    {
      b = (int)((p1 & 0x1F) - (p2 & 0x1F)) << 3;
      g = (int)((p1 & 0x3E0) - (p2 & 0x3E0)) >> 2;
      r = (int)((p1 & 0x7C00) - (p2 & 0x7C00)) >> 7;
    }

  y = r + g + b;
  u = r - b;
  v = -r + 2*g - b;

  if (y < -INTERP_Y_LIMIT || y > INTERP_Y_LIMIT)
    return 1;

  if (u < -INTERP_U_LIMIT || u > INTERP_U_LIMIT)
    return 1;

  if (v < -INTERP_V_LIMIT || v > INTERP_V_LIMIT)
    return 1;

  return 0;
}

static int interp_32_diff(u32 p1, u32 p2)
{
  int r, g, b;
  int y, u, v;

  if ((p1 & 0xF8F8F8) == (p2 & 0xF8F8F8))
    return 0;

  b = (int)((p1 & 0xFF) - (p2 & 0xFF));
  g = (int)((p1 & 0xFF00) - (p2 & 0xFF00)) >> 8;
  r = (int)((p1 & 0xFF0000) - (p2 & 0xFF0000)) >> 16;

  y = r + g + b;
  u = r - b;
  v = -r + 2*g - b;

  if (y < -INTERP_Y_LIMIT || y > INTERP_Y_LIMIT)
    return 1;

  if (u < -INTERP_U_LIMIT || u > INTERP_U_LIMIT)
    return 1;

  if (v < -INTERP_V_LIMIT || v > INTERP_V_LIMIT)
    return 1;

  return 0;
}

static void interp_set(unsigned bits_per_pixel)
{
  interp_bits_per_pixel = bits_per_pixel;

  switch (bits_per_pixel)
    {
    case 15 :
      interp_mask[0] = 0x7C1F;
      interp_mask[1] = 0x03E0;
      break;
    case 16 :
      interp_mask[0] = 0xF81F;
      interp_mask[1] = 0x07E0;
      break;
    case 32 :
      interp_mask[0] = 0xFF00FF;
      interp_mask[1] = 0x00FF00;
      break;
    }
}

#endif