105 lines
2.8 KiB
C
105 lines
2.8 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 : d2flood.c
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Description : G2 Library Routine
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for ProDOS 8 Sys Programs
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Uses Page 2 Double Hi-Res to avoid
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ProDOS Sys Program Load Address at 0x2000
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Double Hi-Res 140 x 192 x 16 color routine
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Draws a filled box to the color specified
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using double hi-res colors 0-15.
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Written by : Bill Buckels
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Date Written : January 2013
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Revision : 1.0 First Release
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Licence : You may use this routine 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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/* consider using d2fbox instead of this routine unless you are not doing
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other plotting and you want to do something like clear the screen which
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does not require pixel level accuracy */
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extern unsigned HB[]; /* page 2 scanline origins */
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extern unsigned char dhrbytes[16][4];
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int d2flood(x1,y1,x2,y2,drawcolor)
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int x1,y1,x2,y2,drawcolor;
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{
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/* draws a filled box to the color specified */
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/* using double hi-res colors 0-15 */
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unsigned int src1,src2,dest;
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int x, packet, xorg, xend, idx, xoff;
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unsigned char *ptr, mainbuf[40], auxbuf[40];
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if (x1 < 0 || x2 > 139 || y1 < 0 || y2 > 191)return 0;
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/* convert pixels to 4 byte blocks - for now */
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x = x1;
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while ((x%7)!=0) x ++; /* advance to left side of box */
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xorg = ((x / 7) * 4);
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idx = x2 + 1;
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xend = ((idx/7) * 4);
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/* assign packet length */
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idx = (xend-xorg);
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if(idx < 4) return 0;
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packet = idx / 2;
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xoff = (xorg / 2);
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if (drawcolor < 1 || drawcolor > 16) drawcolor = 0;
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switch (drawcolor)
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{
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case 15: /* white or black set the memory... */
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setmem(auxbuf,packet,0x7f);
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setmem(mainbuf,packet,0x7f);
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break;
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case 0: setmem(auxbuf,packet,0);
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setmem(mainbuf,packet,0);
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break;
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default:
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/* other colors */
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/* expand byte pairs to build scanline buffers */
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/* interleaf 7 pixels between main and aux memory */
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for (idx = 0; idx < packet; idx++) {
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auxbuf[idx] = dhrbytes[drawcolor][0];
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mainbuf[idx] = dhrbytes[drawcolor][1];
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idx++;
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auxbuf[idx] = dhrbytes[drawcolor][2];
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mainbuf[idx] = dhrbytes[drawcolor][3];
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}
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}
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/* now write the pixels */
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src1 = (unsigned int)&auxbuf[0];
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src2 = (src1 + packet) - 1;
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y2++;
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while(y1<y2)
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{
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dest=HB[y1]+xoff;
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maintoaux(src1,src2,dest);
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movmem(mainbuf,dest,packet);
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y1++;
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}
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return 0;
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}
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