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- /*
- ShowIFF.c - an easy IFF file view program by Christian A. Weber
- Requires the iff.library (in the LIBS: dircetory or in a ROM)
- This program may be freely used and modified!
- I compiled it with Aztec C V3.6, it should also work with Lattice.
- */
-
- #include <exec/types.h>
- #include <graphics/gfxbase.h>
- #include <intuition/intuition.h>
- #include <libraries/iff.h>
-
- struct Library *IntuitionBase,*IFFBase=NULL, *OpenLibrary();
- struct GfxBase *GfxBase;
-
- struct NewScreen ns =
- {
- 0,0,0,0,0,0,0, NULL, CUSTOMSCREEN|SCREENQUIET, NULL,
- (STRPTR)"ShowIFF by Christian A. Weber", NULL, NULL
- };
-
- struct Screen *myscreen = NULL, *OpenScreen();
- APTR ifffile = NULL;
-
- void SetOverscan(screen,x,y,modes)
- register struct Screen *screen;
- register WORD x,y,modes;
- {
- register WORD rows;
-
- rows = GfxBase->NormalDisplayRows; if(rows>300) rows>>=1;
-
- if(modes & HIRES) x -= 320; x -= 320;
- if(modes & LACE) y -= rows; y -= rows;
-
- x >>=1; if(x>32) x=32; if(x<0) x=0;
- y >>=1; if(y>36) y=36; if(y<0) y=0;
-
- screen->ViewPort.DxOffset -= x;
- screen->ViewPort.DyOffset -= y;
-
- RemakeDisplay();
- }
-
-
- main(argc,argv)
- int argc;
- char **argv;
- {
- long count,i;
- UWORD colortable[128];
- struct BitMapHeader *bmhd;
-
- if((argc != 2) || !strcmp(argv[1],"?")) {
- printf("Format: %s filename\n",argv[0]);
- exit(20);
- }
-
- GfxBase = (struct GfxBase *)OpenLibrary("graphics.library",0L);
- IntuitionBase = OpenLibrary("intuition.library",0L);
-
- if(!(IFFBase = OpenLibrary(IFFNAME,IFFVERSION))) {
- printf("Copy the iff.library to your LIBS: directory!\n");
- exit(10);
- }
-
- printf("Loading file %s ... ",argv[1]);
-
- if(!(ifffile=OpenIFF(argv[1]))) Fail("Error opening file");
-
- if(!(bmhd=GetBMHD(ifffile))) Fail("BitMapHeader not found");
-
- ns.Width = bmhd->w;
- ns.Height = bmhd->h;
- ns.Depth = bmhd->nPlanes;
- ns.ViewModes = GetViewModes(ifffile);
-
- if(!(myscreen = OpenScreen(&ns))) Fail("Can't open screen!");
- SetOverscan(myscreen,ns.Width,ns.Height,ns.ViewModes);
-
- count = GetColorTab(ifffile,colortable);
- if(count>32L) count = 32L; /* Some HAM pictures have 64 colors ?! */
- LoadRGB4(&(myscreen->ViewPort),colortable,count);
-
- if(!DecodePic(ifffile,&myscreen->BitMap)) Fail("Can't decode picture");
-
- for(i=0; i<100; ++i)
- {
- if(!((*((UBYTE*)0xbfe001))&64)) break; /* I know it's a hack */
- Delay(5L);
- }
-
- Fail("done"); /* Close the whole stuff */
- }
-
-
- Fail(text)
- char *text;
- {
- if(ifffile) CloseIFF(ifffile);
- if(myscreen) CloseScreen(myscreen);
-
- printf("%s\n",text);
- printf("IffError = %ld\n",IffError());
-
- if(IFFBase) CloseLibrary(IFFBase); /* MUST ALWAYS BE CLOSED !! */
- CloseLibrary(IntuitionBase);
- CloseLibrary(GfxBase);
- exit(0);
- }
-
-