Gold Fish 3/goldfish_volume_3.bin/files/gfx/misc/imagefx_sdk/sas/examples/xdraw/add.c

C/C++ Source or Header | 1995-02-15 | 5.1 KB | 232 lines

/*
 * An Add Enhanced Drawing Mode for ImageFX 2.0
 *
 */

#include <exec/types.h>
#include <scan/modall.h>
#include <scan/drawinfo.h>

/**********************************************************************\

                                Library Vectors

\**********************************************************************/

/*
 * XDM_Attr:
 *
 * Return to ImageFX some information about the Drawing Mode (eg.
 * whether Options are needed, whether we work on greyscale or
 * color, etc.).  Called when ImageFX first scans the drawing
 * mode directory.
 *
 */
ULONG __saveds __asm XDM_Attr (register __a0 struct XDrawAttr *da)
{
   da->Flags      = XDMF_ScanLine;
   da->Priority   = 116;
   return(0);
}

/*
 * XDM_Begin:
 *
 * Prepare before a pixel affecting operation.
 *
 */
int __saveds __asm XDM_Begin (register __a0 struct IDrawInfo *di)
{
   return(1);
}

/*
 * XDM_End:
 *
 * Cleanup after a pixel affecting operation.
 *
 */
void __saveds __asm XDM_End (register __a0 struct IDrawInfo *di)
{
}


/*
 * XDM_Affect:
 *
 * Affect a block of pixels.  We may also affect some of the
 * parameters of the IDrawInfo structure, such as the X & Y
 * location of the block of pixels.
 *
 */
void __saveds __asm XDM_Affect (register __a0 struct IDrawInfo *di)
{
#ifdef USE_BUFFERS

   UBYTE *dr, *dg, *db;
   UBYTE *or, *og, *ob;
   UBYTE *pr, *pg, *pb;
   int i, j;
   short t;

   for (j = 0; j < di->Height; j++)
   {
      GetBufLine(di->BBuf, &dr, &dg, &db, j);
      GetBufLine(di->BPen, &pr, &pg, &pb, j);
      GetBufLine(di->BOut, &or, &og, &ob, j);
      for (i = 0; i < di->Width; i++)
      {
         t = (*dr++) + (*pr++) - 128; if (t < 0) t = 0; else if (t > 255) t = 255;
         *or++ = t;
         t = (*dg++) + (*pg++) - 128; if (t < 0) t = 0; else if (t > 255) t = 255;
         *og++ = t;
         t = (*db++) + (*pb++) - 128; if (t < 0) t = 0; else if (t > 255) t = 255;
         *ob++ = t;
      }
      PutBufLine(di->BOut);
   }

#else

   int n = di->Width * di->Height;
   UBYTE *dr, *dg, *db;
   UBYTE *or, *og, *ob;
   UBYTE *pr, *pg, *pb;
   short t;

   dr = di->BufR;
   dg = di->BufG;
   db = di->BufB;
   pr = di->PenR;
   pg = di->PenG;
   pb = di->PenB;
   or = di->OutR;
   og = di->OutG;
   ob = di->OutB;

   while (n--)
   {
      t = (*dr++) + (*pr++) - 128; if (t < 0) t = 0; else if (t > 255) t = 255;
      *or++ = t;
      t = (*dg++) + (*pg++) - 128; if (t < 0) t = 0; else if (t > 255) t = 255;
      *og++ = t;
      t = (*db++) + (*pb++) - 128; if (t < 0) t = 0; else if (t > 255) t = 255;
      *ob++ = t;
   }
#endif
}

/*
 * XDM_Options:
 *
 * Present a window to the user allowing him to adjust drawing mode
 * options.  Arguments may optionally be passed from an Arexx command.
 * This function will only be called if the flag XDMF_AreOptions is
 * returned from XDM_Attr().
 *
 */
int __saveds __asm XDM_Options (register __a0 LONG *args)
{
   return(0);
}

/*
 * XDM_LoadPrefs:
 *
 * Set preferences according to information loaded from disk.
 *
 */
int __saveds __asm XDM_LoadPrefs (register __a0 void *prefs)
{
   return(1);
}

/*
 * XDM_SavePrefs:
 *
 * Request preferences settings that are about to be saved to disk.
 *
 */
int __saveds __asm XDM_SavePrefs (register __a0 void *prefs)
{
   return(1);
}


int __saveds __asm XDM_Init (void)
{
   return(1);
}

void __saveds __asm XDM_Cleanup (void)
{
}


/**********************************************************************\

                         Library Initialization Stuff

\**********************************************************************/

/*
 * This is the table of all the functions that can be called in this
 * module.  The first four (Open, Close, Expunge, and Null) are reserved
 * for system use and MUST be specified in the order shown.  The actual
 * functions are in the standard module startup code.
 */
ULONG FuncTable[] = {
   /* These four MUST be present in this order */
   (ULONG) LibOpen,
   (ULONG) LibClose,
   (ULONG) LibExpunge,
   (ULONG) LibNull,

   /* Specific to the module */
   (ULONG) XDM_Attr,
   (ULONG) XDM_Begin,
   (ULONG) XDM_End,
   (ULONG) XDM_Affect,
   (ULONG) XDM_Options,
   (ULONG) XDM_LoadPrefs,
   (ULONG) XDM_SavePrefs,
   (ULONG) 0,
   (ULONG) 0,
   (ULONG) XDM_Init,
   (ULONG) XDM_Cleanup,

   /* End with -1L */
   (ULONG) -1L
};

/*
 * These are used by the standard module startup code.
 * LibraryName is the name of the library, and LibraryID is a short
 * description of the library.  Both of these are largely irrelavent,
 * but they are included just for completeness.
 */
UBYTE LibraryID[]    = "$VER: Add Extended Drawing Mode 2.0.6 (15.2.95)";
UBYTE LibraryType    = NT_XDRAWMODE;

/*
 * This is called by the standard module startup code when Image Scan
 * first opens the module.  Here we should fill in the NumGads,
 * NewGad, Language, and LangCount fields of the provided ModuleBase
 * structure if necessary.
 */
long  __asm UserOpen (register __a6 struct ModuleBase *modbase)
{
   return(TRUE);
}

/*
 * This is called by the standard module startup code when Image Scan
 * closes the module.  It should cleanup anything allocated or obtained
 * in the UserOpen() function.
 */
long  __asm UserClose (register __a6 struct ModuleBase *modbase)
{
   return(TRUE);
}