#include "img_conv.h"

#ifdef __cplusplus
extern "C" {
#endif

static struct valid_image_type {
   int type;
   int newtype;
   void *from_proc;
   void *to_proc;
} valid_image_types[] =
{
   { imbpp24 | imColor | imfmtBGR,      imRGB, (void*)cm_reverse_palette, (void*)cm_reverse_palette},
   { imbpp32 | imColor | imfmtRGBI,     imRGB, (void*)bc_rgbi_rgb, (void*)bc_rgb_rgbi },
   { imbpp32 | imColor | imfmtIRGB,     imRGB, (void*)bc_irgb_rgb, (void*)bc_rgb_irgb },
   { imbpp32 | imColor | imfmtBGRI,     imRGB, (void*)bc_bgri_rgb, (void*)bc_rgb_bgri },
   { imbpp32 | imColor | imfmtIBGR,     imRGB, (void*)bc_ibgr_rgb, (void*)bc_rgb_ibgr },
};

Bool
itype_importable( int type, int *newtype, void **from_proc, void **to_proc)
{
   int i;

   for (i=0; i < sizeof(valid_image_types)/sizeof(struct valid_image_type); i++)
      if ( valid_image_types[i]. type == type) {
         if (newtype) *newtype =        valid_image_types[i]. newtype;
         if (from_proc) *from_proc =    valid_image_types[i]. from_proc;
         if (to_proc) *to_proc =        valid_image_types[i]. to_proc;
         return true;
      }
   return false;
}


static void
memcpy_bitconvproc( Byte * src, Byte * dest, int count)
{
   memcpy( dest, src, count);
}


void
ibc_repad( Byte * source, Byte * dest, int srcLineSize, int dstLineSize, int srcDataSize, int dstDataSize, int srcBpp, int dstBpp, void * convProc, Bool reverse)
{
   int sb  = srcLineSize / srcBpp;
   int db  = dstLineSize / dstBpp;
   int bsc = sb > db ? db : sb;
   int sh  = srcDataSize / srcLineSize;
   int dh  = dstDataSize / dstLineSize;
   int  h  = sh > dh ? dh : sh;

   if ( convProc == nil) {
      convProc = (void*)memcpy_bitconvproc;
      srcBpp = dstBpp = 1;
      sb = srcLineSize;
      db = dstLineSize;
      bsc = sb > db ? db : sb;
   }

   if ( reverse) {
      dest += dstLineSize * ( h - 1);
      for ( ; h > 0; h--, source += srcLineSize, dest -= dstLineSize)
         (( PSimpleConvProc) convProc)( source, dest, bsc);
   } else {
      for ( ; h > 0; h--, source += srcLineSize, dest += dstLineSize)
         (( PSimpleConvProc) convProc)( source, dest, bsc);
   }

   sb = srcDataSize % srcLineSize / srcBpp;
   db = dstDataSize % dstLineSize / dstBpp;
   (( PSimpleConvProc) convProc)( source, dest, sb > db ? db : sb);
}

void
bc_rgb_rgbi( register Byte * source, register Byte * dest, register int count)
{
   dest   += count * 4 - 1;
   source += count * 3 - 1;
   while ( count--)
   {
      *dest-- = 0;
      *dest-- = *source--;
      *dest-- = *source--;
      *dest-- = *source--;
   }
}

void
bc_rgbi_rgb( register Byte * source, register Byte * dest, register int count)
{
   while ( count--)
   {
      *dest++ = *source++;
      *dest++ = *source++;
      *dest++ = *source++;
      source++;
   }
}


void
bc_rgb_irgb( register Byte * source, register Byte * dest, register int count)
{
   dest   += count * 4 - 1;
   source += count * 3 - 1;
   while ( count--)
   {
      *dest-- = *source--;
      *dest-- = *source--;
      *dest-- = *source--;
      *dest-- = 0;
   }
}

void
bc_irgb_rgb( register Byte * source, register Byte * dest, register int count)
{
   while ( count--)
   {
      source++;
      *dest++ = *source++;
      *dest++ = *source++;
      *dest++ = *source++;
   }
}

void
bc_bgri_rgb( register Byte * source, register Byte * dest, register int count)
{
   while ( count--)
   {
      register Byte a, b;
      a = *source++;
      b = *source++;
      *dest++ = *source++;
      *dest++ = b;
      *dest++ = a;
      source++;
   }
}

void
bc_rgb_bgri( register Byte * source, register Byte * dest, register int count)
{
   dest   += count * 4 - 1;
   source += count * 3 - 1;
   while ( count--)
   {
      register Byte a = *source--;
      register Byte b = *source--;
      *dest--   = 0;
      *dest-- = *source--;
      *dest-- = b;
      *dest-- = a;
   }
}

void
bc_ibgr_rgb( register Byte * source, register Byte * dest, register int count)
{
   while ( count--)
   {
      register Byte a, b;
      source++;
      a = *source++;
      b = *source++;
      *dest++ = *source++;
      *dest++ = b;
      *dest++ = a;
   }
}

void
bc_rgb_ibgr( register Byte * source, register Byte * dest, register int count)
{
   dest   += count * 4 - 1;
   source += count * 3 - 1;
   while ( count--)
   {
      register Byte a = *source--;
      register Byte b = *source--;
      *dest-- = *source--;
      *dest-- = b;
      *dest-- = a;
      *dest-- = 0;
   }
}



#ifdef __cplusplus
}
#endif