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125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/* ------------------------------------------------------------------------
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System : Manx Aztec C65 Version 3.2b
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MS-DOS cross-development environment
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Platform : Apple IIe 128K PRODOS 8
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Program : emsput.c
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Description : G2 Library Routine
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Written by : Bill Buckels
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Revision Date: July 7, 1991
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Licence : You may use this code for whatever you wish as long
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as you agree that Bill Buckels has no warranty or
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liability obligations whatsoever from said use.
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------------------------------------------------------------------------ */
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#define PUT 0 /* action verbs for putimage */
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#define GET 1 /* expand as required */
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#define P_STIX 2
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#define P_BLACK 3
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#define P_WHITE 4
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#define P_AND 5
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#define P_XOR 6
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/* emsputimage() */
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/* handles screen manipulation of image fragments */
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/* both gets and puts and uses ems memory for the IO buffer */
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/* for screen puts other than memory moves a buffer is used */
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/* since a full screen stored in our .BOT format has a
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file size of 7680 bytes there is room in the upper ram bank
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to store 6 full screens (6x7680=46080 bytes) */
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extern unsigned HB[];
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emsputimage(emsarraybase,width,height,xorg,yorg,action)
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unsigned emsarraybase;
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int width,height,xorg,yorg,action;
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{
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int ctr;
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char *ptr,*ptr2;
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int temp;
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/* the ems buffer starts above the 2nd page of text screen */
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/* in auxiliary memory */
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unsigned hitemp=emsarraybase+0x0C00;
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int bos=yorg+height;
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char tempbyte='\x80';
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char arrayname[40] ;
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if(action==P_WHITE)tempbyte='\xff';
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while(yorg<bos)
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{
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temp = HB[yorg];
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ptr = (char *)&arrayname[0];
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ptr2 = (char *)(temp+xorg);
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/* expand action verbs as required */
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switch(action)
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{
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case P_XOR : /* reverse video */
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auxtomain(hitemp,hitemp+width-1,&arrayname[0]);
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for(ctr=0;ctr<width;ctr++)
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{
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*ptr2=(*ptr^0x7f);
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*ptr2++;
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*ptr++;
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}
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break;
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/* bitwise ANDing the background... */
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/* works best with white */
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case P_AND :
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auxtomain(hitemp,hitemp+width-1,&arrayname[0]);
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for(ctr=0;ctr<width;ctr++)
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{
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*ptr2|=*ptr;
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*ptr2++;
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*ptr++;
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}
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break;
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/* if the image byte is black don't erase the */
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/* background */
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case P_STIX :
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auxtomain(hitemp,hitemp+width-1,&arrayname[0]);
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for(ctr=0;ctr<width;ctr++)
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{
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tempbyte=*ptr++;
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if(tempbyte=='\x80'||tempbyte=='\x00')*ptr2++;
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else *ptr2++=tempbyte;
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}
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break;
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/* clear an area the size of the image fragment */
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/* to black or white */
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case P_BLACK:
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case P_WHITE:
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for(ctr=0;ctr<width;ctr++)*ptr2++=tempbyte;break;
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/* read each raster into ems */
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case GET: maintoaux((temp+xorg),(temp+xorg+width-1),hitemp);
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break;
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case PUT: /* read each raster to the screen */
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default : auxtomain(hitemp,hitemp+width-1,(temp+xorg));
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break;
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}
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yorg++;
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hitemp+=width;
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}
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}
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