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/*
**
** $Id: EasyExample.c,v 1.1 92/05/28 17:08:31 chris Exp $
** $Revision: 1.1 $
**
** $Filename: Examples/EasyExample.c $
** $Author: chris $
** $Release: 21.1 $
** $Date: 92/05/28 17:08:31 $
**
** A simple ILBM file viewer. To compile with Lattice C 5.x, just
** type 'lmk'. For other compilers you may have to do minor changes.
**
** THIS IS PD. NO WARRANTY. USE AT YOUR OWN RISK.
**
*/
#include <proto/exec.h>
#include <proto/graphics.h>
#include <graphics/gfxbase.h>
#include <proto/intuition.h>
#include <dos/dos.h>
#include <stdio.h>
#include <string.h>
/*
** If you don't want to put non-Commodore files in the standard
** include directories, use the SASCOptions program to add the place
** where you store those non-standard files to your include path.
*/
#include <libraries/iff.h>
struct Library *IntuitionBase,*IFFBase;
struct GfxBase *GfxBase;
/****************************************************************************
** Adjust the screen position for overscan pictures in an OS 1.3 compatible
** way. There are more clever ways to do this under Kickstart 2.x, so you
** may want to modify this code.
*/
void SetOverscan(struct Screen *screen)
{
WORD cols, rows, x=screen->Width, y=screen->Height;
struct ViewPort *vp = &(screen->ViewPort);
cols = GfxBase->NormalDisplayColumns>>1;
rows = GfxBase->NormalDisplayRows; if(rows>300) rows>>=1;
x -= cols; if(vp->Modes & HIRES) x -= cols;
y -= rows; if(vp->Modes & LACE) y -= rows;
x >>=1; if(x<0) x=0; y >>=1; if(y<0) y=0; if(y>32) y=32;
/*
** To avoid color distortions in HAM mode, we must limit the
** left edge of the screen to the leftmost value the hardware
** can display.
*/
if(vp->Modes & HAM)
{
if(GfxBase->ActiView->DxOffset-x < 96)
x = GfxBase->ActiView->DxOffset-96;
}
vp->DxOffset = -x; vp->DyOffset = -y;
MakeScreen(screen);
RethinkDisplay();
}
/****************************************************************************
** Load an IFF file and if it's an ILBM, display the picture on a screen
*/
void DisplayILBM(char *filename)
{
IFFL_HANDLE iff;
if(iff = IFFL_OpenIFF(filename, IFFL_MODE_READ) )
{
struct IFFL_BMHD *bmhd;
if(bmhd = IFFL_GetBMHD(iff) )
{
struct Screen *myscreen;
struct NewScreen ns;
memset(ns, 0, sizeof(ns) );
ns.Type = CUSTOMSCREEN | SCREENQUIET | SCREENBEHIND;
ns.Width = bmhd->w;
ns.Height = bmhd->h;
ns.Depth = bmhd->nPlanes;
ns.ViewModes = IFFL_GetViewModes(iff);
if(myscreen = OpenScreen(&ns) )
{
LONG count;
UWORD colortable[256];
SetOverscan(myscreen);
count = IFFL_GetColorTab(iff, colortable);
/* Fix for old broken HAM pictures */
if(count>32L) count = 32L;
LoadRGB4(&(myscreen->ViewPort), colortable, count);
printf("Press Ctrl-C to quit.\n");
if(IFFL_DecodePic(iff, &myscreen->BitMap) )
{
ScreenToFront(myscreen);
Wait(SIGBREAKF_CTRL_C);
}
else printf("Can't decode picture.\n");
CloseScreen(myscreen);
}
else printf("Can't open screen.\n");
}
else printf("This file has no bitmap header.\n");
IFFL_CloseIFF(iff);
}
else printf("Can't open file '%s'\n",filename);
}
/****************************************************************************
** Main program
*/
LONG main(int argc, char **argv)
{
/*
** Check command line args
*/
if((argc != 2) || !strcmp(argv[1],"?") )
{
printf("Usage: %s <filename>\n",argv[0]);
return RETURN_FAIL;
}
/*
** Open the libraries we need
*/
if(GfxBase = (struct GfxBase *)OpenLibrary("graphics.library", 0L) )
{
if(IntuitionBase = OpenLibrary("intuition.library", 0L) )
{
if(IFFBase = OpenLibrary(IFFNAME, IFFVERSION) )
{
DisplayILBM(argv[1]);
printf("IFFL_IFFError value is %ld\n", IFFL_IFFError() );
CloseLibrary(IFFBase); /* THIS IS VERY IMPORTANT! */
}
else printf("Can't open iff.library V%ld+\n", IFFVERSION);
CloseLibrary(IntuitionBase);
}
CloseLibrary((struct Library *)GfxBase);
}
return RETURN_OK;
}
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