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aslscreenmode.c
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C/C++ Source or Header
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1995-11-08
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2KB
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88 lines
/* Display an ASL screenmode requester */
/* modified for use with jpegAGA 2.x */
#include <exec/types.h>
#include <libraries/asl.h>
#include <utility/tagitem.h>
#define __NOLIBBASE__
#include <proto/exec.h>
#include <proto/asl.h>
#include <proto/graphics.h>
extern ULONG SMR_DisplayID;
extern short SMR_HAM;
struct Library *AslBase=NULL;
extern struct GfxBase *GfxBase;
struct TagItem smrtags[] =
{ { ASLSM_PropertyFlags, DIPF_IS_AA},
{ ASLSM_PropertyMask, DIPF_IS_DUALPF | DIPF_IS_EXTRAHALFBRITE},
{ TAG_DONE, 0 }
};
struct ScreenModeRequester *smr = NULL;
int ChooseScreenMode(int grayscale, char *title)
{
int ASL_failure=1;
if(grayscale)
smrtags[1].ti_Data = DIPF_IS_DUALPF | DIPF_IS_EXTRAHALFBRITE | DIPF_IS_HAM;
else
smrtags[1].ti_Data = DIPF_IS_DUALPF | DIPF_IS_EXTRAHALFBRITE;
if(!GfxBase)
{
if(!(GfxBase = (struct GfxBase *)OpenLibrary((UBYTE *)"graphics.library",39)))
{
printf("Could not open graphics.library V39 or higher.\n");
return 1;
}
}
if(!AslBase) AslBase=OpenLibrary("asl.library", 39L);
if(AslBase)
{
if(!smr) smr = (struct ScreenModeRequester *)
AllocAslRequest(ASL_ScreenModeRequest, smrtags);
if(smr)
{
if( AslRequest(smr, 0L) )
{
struct DisplayInfo queryinfo;
/* printf("Display type: $%lx\n", smr->sm_DisplayID); */
SMR_DisplayID = smr->sm_DisplayID;
if(GetDisplayInfoData(NULL, (UBYTE *)&queryinfo, sizeof(queryinfo),DTAG_DISP,SMR_DisplayID))
{
if(queryinfo.PropertyFlags)
{
if(queryinfo.PropertyFlags & DIPF_IS_HAM)
SMR_HAM = 1;
else SMR_HAM = 0;
/* if(SMR_HAM) printf("Mode is HAM\n"); */
}
else ASL_failure = 1;
}
ASL_failure=0;
}
else
{
/* printf("User cancelled or error...\n"); */
ASL_failure=1;
}
}
return ASL_failure;
}
printf("Could not open asl.library V39 or higher.\n");
return 1;
}