/*
**===========================================================================
** HAL_LUT.C - This module contains the LUT routines for the 13506 HAL.
**---------------------------------------------------------------------------
** Copyright (c) 1997, 2001 Epson Research and Development, Inc.
** All Rights Reserved.
**===========================================================================
*/

#include "hal.h"
#include "assert.h"
#include "nonsefns.h"

/*-------------------------------------------------------------------------*/

static const char Revision[] = "HAL_LUT.C=$Revision: 12 $";

/*-------------------------------------------------------------------------*/

/*
** _WriteLut()
**
** This function sets either all or a portion of the 256 color LUT.
**
*/
void _WriteLut(int DisplayMode, BYTE *pLUT, int count)
{
   int idx, rgb;

   ASSERT( count <= 256 );

   if (DisplayMode == LCD)
      seWriteRegByte(REG_LUT_MODE, 0x01); /* write to LCD LUT */
   else if ((DisplayMode == CRT) || (DisplayMode == TV))
      seWriteRegByte(REG_LUT_MODE, 0x02); /* write to CRT/TV LUT */
   else
      seWriteRegByte(REG_LUT_MODE, 0x00); /* write to LCD and CRT/TV LUT */


   seWriteRegByte( REG_LUT_ADDR, 0 );

   for (idx = 0; idx < count; idx++)
      {
      for (rgb = 0; rgb < 3; rgb++)
         seWriteRegByte( REG_LUT_DATA, *pLUT++ );
      }
}

/*-------------------------------------------------------------------------*/

/*
** seWriteLut()
**
** This function sets either all or a portion of the 256 color LUT.
**
*/
void seWriteLut(BYTE *pLUT, int count)
{
   _WriteLut(_ActiveImageSurface->DisplayMode, pLUT, count);
}

/*-------------------------------------------------------------------------*/

void seWriteLcdLut(BYTE *pLUT, int count)
{
   _WriteLut(LCD, pLUT, count);
}

/*-------------------------------------------------------------------------*/

void seWriteCrtLut(BYTE *pLUT, int count)
{
   _WriteLut(CRT, pLUT, count);
}

/*-------------------------------------------------------------------------*/

void seWriteTvLut(BYTE *pLUT, int count)
{
   _WriteLut(TV, pLUT, count);
}

/*-------------------------------------------------------------------------*/

/*
** seReadLut()
**
** This routine reads the entire LUT and puts the results in
** the array pointed to by pLut.
*/
void seReadLut(BYTE *pLUT, int count)
{
   int idx, rgb;

   ASSERT( count <= 256 );

   if ( (_ActiveImageSurface->DisplayMode & (CRT | TV)) &&
       !(_ActiveImageSurface->DisplayMode & LCD))
      seWriteRegByte(REG_LUT_MODE, 0x02); /* read from CRT/TV LUT */
   else
      seWriteRegByte(REG_LUT_MODE, 0x01); /* read from LCD LUT */


   seWriteRegByte( REG_LUT_ADDR, 0 );

   for (idx = 0; idx < count; ++idx)
      {
      for (rgb = 0; rgb < 3; ++rgb)
         *pLUT++ = (BYTE) seReadRegByte( REG_LUT_DATA );
      }
}

/*-------------------------------------------------------------------------*/

void seReadLcdLut(BYTE *pLUT, int count)
{
   int idx, rgb;

   ASSERT( count <= 256 );

   seWriteRegByte(REG_LUT_MODE, 0x01); /* read from LCD LUT */
   seWriteRegByte(REG_LUT_ADDR, 0);

   for (idx = 0; idx < count; ++idx)
      {
      for (rgb = 0; rgb < 3; ++rgb)
         *pLUT++ = (BYTE) seReadRegByte( REG_LUT_DATA );
      }
}

/*-------------------------------------------------------------------------*/

void seReadCrtLut(BYTE *pLUT, int count)
{
   int idx, rgb;

   ASSERT( count <= 256 );

   seWriteRegByte(REG_LUT_MODE, 0x02); /* read from CRT/TV LUT */
   seWriteRegByte( REG_LUT_ADDR, 0 );

   for (idx = 0; idx < count; ++idx)
      {
      for (rgb = 0; rgb < 3; ++rgb)
         *pLUT++ = (BYTE) seReadRegByte( REG_LUT_DATA );
      }
}

/*-------------------------------------------------------------------------*/

void seReadTvLut(BYTE *pLUT, int count)
{
   seReadCrtLut(pLUT, count);
}

/*-------------------------------------------------------------------------*/

/*
** _WriteLutEntry()
**
** This function writes just one LUT entry.
** This function does not use the display surface.
**
** NOTE:
**
** - pLUT must point to a valid LUT data entry (BYTE color[3])
**
*/
void _WriteLutEntry(int DisplayMode, int index, BYTE *pColor)
{
   ASSERT( index <= 256 );

   if (DisplayMode == LCD)
      seWriteRegByte(REG_LUT_MODE, 0x01); /* write to LCD LUT */
   else if (DisplayMode & (CRT | TV))
      seWriteRegByte(REG_LUT_MODE, 0x02); /* write to CRT/TV LUT */
   else
      seWriteRegByte(REG_LUT_MODE, 0x00); /* write to LCD and CRT/TV LUT */


   seWriteRegByte( REG_LUT_ADDR, (BYTE) index );

   seWriteRegByte( REG_LUT_DATA, *pColor++ );
   seWriteRegByte( REG_LUT_DATA, *pColor++ );
   seWriteRegByte( REG_LUT_DATA, *pColor );
}

/*-------------------------------------------------------------------------*/

/*
** seWriteLutEntry()
**
** This function writes just one LUT entry.
**
** NOTE:
**
** - pLUT must point to a valid LUT data entry (BYTE lut[3])
**
*/
void seWriteLutEntry(int index, BYTE *pColor)
{
   _WriteLutEntry(_ActiveImageSurface->DisplayMode, index, pColor);
}

/*-------------------------------------------------------------------------*/

void seWriteLcdLutEntry(int index, BYTE *pColor)
{
   _WriteLutEntry(LCD, index, pColor);
}

/*-------------------------------------------------------------------------*/

void seWriteCrtLutEntry(int index, BYTE *pColor)
{
   _WriteLutEntry(CRT, index, pColor);
}

/*-------------------------------------------------------------------------*/

void seWriteTvLutEntry(int index, BYTE *pColor)
{
   _WriteLutEntry(TV, index, pColor);
}

/*-------------------------------------------------------------------------*/

/*
** _ReadLcdLutEntry()
**
** This function reads just one LUT entry.
**
** NOTE:
**
** - pColor must point to a valid LUT data entry (BYTE color[3])
*/
void seReadLcdLutEntry(int index, BYTE *pColor)
{
   ASSERT( index < 256);

   seWriteRegByte(REG_LUT_MODE, 0x01); /* read from LCD LUT */
   seWriteRegByte( REG_LUT_ADDR, (BYTE) index );

   *pColor++ = (BYTE) seReadRegByte( REG_LUT_DATA );
   *pColor++ = (BYTE) seReadRegByte( REG_LUT_DATA );
   *pColor   = (BYTE) seReadRegByte( REG_LUT_DATA );
}

/*-------------------------------------------------------------------------*/

/*
** seReadCrtLutEntry()
**
** This function reads just one LUT entry.
**
** NOTE:
**
** - pColor must point to a valid LUT data entry (BYTE color[3])
*/
void seReadCrtLutEntry(int index, BYTE *pColor)
{
   ASSERT( index < 256);

   seWriteRegByte(REG_LUT_MODE, 0x02); /* read from CRT/TV LUT */
   seWriteRegByte( REG_LUT_ADDR, (BYTE) index );

   *pColor++ = (BYTE) seReadRegByte( REG_LUT_DATA );
   *pColor++ = (BYTE) seReadRegByte( REG_LUT_DATA );
   *pColor   = (BYTE) seReadRegByte( REG_LUT_DATA );
}

/*-------------------------------------------------------------------------*/

void seReadTvLutEntry(int index, BYTE *pColor)
{
   seReadCrtLutEntry(index, pColor);
}

/*-------------------------------------------------------------------------*/

/*
** seReadLutEntry()
**
** This function reads just one LUT entry.
**
** NOTE:
**
** - pLUT must point to a valid LUT data entry (BYTE lut[3])
*/
void seReadLutEntry(int index, BYTE *pColor)
{
   ASSERT( index < 256);

   if ( (_ActiveImageSurface->DisplayMode & (CRT | TV)) &&
       !(_ActiveImageSurface->DisplayMode & LCD))
      seReadCrtLutEntry(index, pColor);
   else
      seReadLcdLutEntry(index, pColor);
}

/*-------------------------------------------------------------------------*/