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| -rw-r--r-- | Examples/EasyExample.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/Examples/EasyExample.c b/Examples/EasyExample.c new file mode 100644 index 0000000..d01b0d3 --- /dev/null +++ b/Examples/EasyExample.c @@ -0,0 +1,168 @@ +/* +** +** $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; +} + |