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- /**
- ** CURSOR.C
- **
- ** Copyright (C) 1992, Csaba Biegl
- ** 820 Stirrup Dr, Nashville, TN, 37221
- ** csaba@vuse.vanderbilt.edu
- **
- ** This file is distributed under the terms listed in the document
- ** "copying.cb", available from the author at the address above.
- ** A copy of "copying.cb" should accompany this file; if not, a copy
- ** should be available from where this file was obtained. This file
- ** may not be distributed without a verbatim copy of "copying.cb".
- ** You should also have received a copy of the GNU General Public
- ** License along with this program (it is in the file "copying");
- ** if not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- ** Cambridge, MA 02139, USA.
- **
- ** This program is distributed in the hope that it will be useful,
- ** but WITHOUT ANY WARRANTY; without even the implied warranty of
- ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ** GNU General Public License for more details.
- **/
-
- #include "grx.h"
- #include "mousex.h"
- #include "libgrx.h"
- #include "gmalloc.h"
-
-
- GrCursor *_GrMouseCursor = NULL;
-
- GrCursor *GrBuildCursor(char *bits,int w,int h,int xo,int yo,GrColorTableP ct)
- {
- GrCursor *c = _GrMalloc(sizeof(GrCursor));
- GrContext save,work;
- unsigned char *bp;
- int workw = (w + w + 15) & ~7;
- int workh = (h + h + 7) & ~1;
- long csize = GrContextSize(w,h);
- long wsize = GrContextSize(workw,workh);
- int ww,hh,color,onscreen = FALSE;
- char far *vdata = NULL;
- char far *data;
- long addr;
-
- if(c == NULL) return(NULL);
- #if !defined(__GNUC__) || (__GNUC__ != 2)
- /* something is fishy in GCC 2.0 at this time !! */
- /* maybe I will chase it down if I have enough time */
- #if (GRXPLANES & 4)
- if(_GrNumColors == 16) {
- long wsize2 = GrPlaneSize(workw,workh);
- vdata = _GrVidAlloc((int)(2 * wsize2));
- if(vdata != (char far *)NULL) {
- onscreen = TRUE;
- wsize = wsize2;
- }
- }
- #endif
- #endif
- data = _GrFarMalloc((csize + (onscreen ? 0L : wsize)) * 2);
- if(data == (char far *)NULL) {
- _GrFree(c);
- if(onscreen) _GrVidFree(vdata);
- return(NULL);
- }
-
- c->cr_xcord = c->cr_ycord = 0;
- c->cr_xwpos = c->cr_ywpos = 0;
- c->cr_xsize = w;
- c->cr_ysize = h;
- c->cr_xoffs = xo;
- c->cr_yoffs = yo;
- c->cr_xwork = workw;
- c->cr_ywork = workh;
- c->cr_displayed = FALSE;
-
- GrSaveContext(&save);
-
- GrCreateContext(w,h,data,&work);
- data = (char far *)((char huge *)data + csize);
- GrSetContext(&work);
- bp = (unsigned char *)bits;
- for(hh = 0; hh < h; hh++) {
- addr = PIXEL_ADDR(0,hh);
- _GrSetPixRow(addr,C_COLOR,w);
- for(ww = 0; ww < w; ww++) {
- if(*bp++ != 0) _GrSetPixel(addr,0);
- addr += PIXEL_SIZE;
- }
- }
- c->cr_andmask = *((GrVidRAM *)&work);
-
- GrCreateContext(w,h,data,&work);
- data = (char far *)((char huge *)data + csize);
- GrSetContext(&work);
- bp = (unsigned char *)bits;
- for(hh = 0; hh < h; hh++) {
- addr = PIXEL_ADDR(0,hh);
- _GrSetPixRow(addr,0,w);
- for(ww = 0; ww < w; ww++) {
- if((color = *bp++) != 0) {
- color--;
- if(ct != NULL) color = GR_CTABLE_COLOR(ct,color);
- _GrSetPixel(addr,(color & C_COLOR));
- }
- addr += PIXEL_SIZE;
- }
- }
- c->cr_ormask = *((GrVidRAM *)&work);
-
- if(!onscreen) vdata = data;
-
- GrCreateContext(workw,workh,vdata,&work);
- vdata = (char far *)((char huge *)vdata + wsize);
- c->cr_work = *((GrVidRAM *)&work);
- if(onscreen) {
- c->cr_work.gc_onscreen = TRUE;
- c->cr_work.gc_planeoffset = 0L;
- }
-
- GrCreateContext(workw,workh,vdata,&work);
- c->cr_save = *((GrVidRAM *)&work);
- if(onscreen) {
- c->cr_save.gc_onscreen = TRUE;
- c->cr_save.gc_planeoffset = 0L;
- }
-
- GrSetContext(&save);
- return(c);
- }
-
- void GrDestroyCursor(GrCursor *cursor)
- {
- if(cursor && (cursor != _GrMouseCursor)) {
- GrEraseCursor(cursor);
- _GrFarFree(cursor->cr_andmask.gc_baseaddr);
- if(cursor->cr_work.gc_onscreen)
- _GrVidFree(cursor->cr_work.gc_baseaddr);
- _GrFree(cursor);
- }
- }
-
- void GrDisplayCursor(GrCursor *cursor)
- {
- int xpos,ypos;
- int xwrk,ywrk;
- int xsiz,ysiz;
-
- if(cursor->cr_displayed) return;
- cursor->cr_displayed = TRUE;
- xpos = cursor->cr_xcord - cursor->cr_xoffs;
- ypos = cursor->cr_ycord - cursor->cr_yoffs;
- xsiz = cursor->cr_xwork;
- ysiz = cursor->cr_ywork;
- xwrk = (xpos - (cursor->cr_xsize >> 1)) & ~7;
- ywrk = (ypos - (cursor->cr_ysize >> 1));
- if(xwrk < 0) xwrk = 0;
- if(ywrk < 0) ywrk = 0;
- if(xwrk > (_GrScreenX - xsiz)) xwrk = _GrScreenX - xsiz;
- if(ywrk > (_GrScreenY - ysiz)) ywrk = _GrScreenY - ysiz;
- cursor->cr_xwpos = xwrk;
- cursor->cr_ywpos = ywrk;
- _GrPixCopy((GrContext *)&cursor->cr_save,
- PIX_ADDR(&cursor->cr_save,0,0),
- SCREEN,
- PIX_ADDR(SCREEN,xwrk,ywrk),
- xsiz,ysiz,
- GrWRITE
- );
- _GrPixCopy((GrContext *)&cursor->cr_work,
- PIX_ADDR(&cursor->cr_work,0,0),
- (GrContext *)&cursor->cr_save,
- PIX_ADDR(&cursor->cr_save,0,0),
- xsiz,ysiz,
- GrWRITE
- );
- xpos -= xwrk;
- ypos -= ywrk;
- xsiz = cursor->cr_xsize;
- ysiz = cursor->cr_ysize;
- xwrk = ywrk = 0;
- if(xpos < 0) { xwrk -= xpos; xsiz += xpos; xpos = 0; }
- if(ypos < 0) { ywrk -= ypos; ysiz += ypos; ypos = 0; }
- if(xsiz > (cursor->cr_xwork - xpos)) xsiz = cursor->cr_xwork - xpos;
- if(ysiz > (cursor->cr_ywork - ypos)) ysiz = cursor->cr_ywork - ypos;
- if((xsiz <= 0) || (ysiz <= 0)) return;
- _GrPixCopy((GrContext *)&cursor->cr_work,
- PIX_ADDR(&cursor->cr_work,xpos,ypos),
- (GrContext *)&cursor->cr_andmask,
- PIX_ADDR(&cursor->cr_andmask,xwrk,ywrk),
- xsiz,ysiz,
- GrAND
- );
- _GrPixCopy((GrContext *)&cursor->cr_work,
- PIX_ADDR(&cursor->cr_work,xpos,ypos),
- (GrContext *)&cursor->cr_ormask,
- PIX_ADDR(&cursor->cr_ormask,xwrk,ywrk),
- xsiz,ysiz,
- GrOR
- );
- xpos = cursor->cr_xwpos;
- ypos = cursor->cr_ywpos;
- _GrPixCopy(SCREEN,
- PIX_ADDR(SCREEN,xpos,ypos),
- (GrContext *)&cursor->cr_work,
- PIX_ADDR(&cursor->cr_work,0,0),
- cursor->cr_xwork,cursor->cr_ywork,
- GrWRITE
- );
- }
-
- void GrEraseCursor(GrCursor *cursor)
- {
- int xpos = cursor->cr_xwpos;
- int ypos = cursor->cr_ywpos;
-
- if(cursor->cr_displayed) {
- _GrPixCopy(SCREEN,
- PIX_ADDR(SCREEN,xpos,ypos),
- (GrContext *)&cursor->cr_save,
- PIX_ADDR(&cursor->cr_save,0,0),
- cursor->cr_xwork,cursor->cr_ywork,
- GrWRITE
- );
- cursor->cr_displayed = FALSE;
- }
- }
-
- void GrMoveCursor(GrCursor *cursor,int x,int y)
- {
- int xpos,ypos;
- int xsiz,ysiz;
-
- if((cursor->cr_xcord == x) && (cursor->cr_ycord == y)) return;
- cursor->cr_xcord = x;
- cursor->cr_ycord = y;
- if(!cursor->cr_displayed) return;
- xpos = x - cursor->cr_xoffs - cursor->cr_xwpos;
- ypos = y - cursor->cr_yoffs - cursor->cr_ywpos;
- xsiz = cursor->cr_xsize;
- ysiz = cursor->cr_ysize;
- if((xpos >= 0) && ((xpos + xsiz) <= cursor->cr_xwork) &&
- (ypos >= 0) && ((ypos + ysiz) <= cursor->cr_ywork)) {
- _GrPixCopy((GrContext *)&cursor->cr_work,
- PIX_ADDR(&cursor->cr_work,0,0),
- (GrContext *)&cursor->cr_save,
- PIX_ADDR(&cursor->cr_save,0,0),
- cursor->cr_xwork,cursor->cr_ywork,
- GrWRITE
- );
- _GrPixCopy((GrContext *)&cursor->cr_work,
- PIX_ADDR(&cursor->cr_work,xpos,ypos),
- (GrContext *)&cursor->cr_andmask,
- PIX_ADDR(&cursor->cr_andmask,0,0),
- xsiz,ysiz,
- GrAND
- );
- _GrPixCopy((GrContext *)&cursor->cr_work,
- PIX_ADDR(&cursor->cr_work,xpos,ypos),
- (GrContext *)&cursor->cr_ormask,
- PIX_ADDR(&cursor->cr_ormask,0,0),
- xsiz,ysiz,
- GrOR
- );
- xpos = cursor->cr_xwpos;
- ypos = cursor->cr_ywpos;
- _GrPixCopy(SCREEN,
- PIX_ADDR(SCREEN,xpos,ypos),
- (GrContext *)&cursor->cr_work,
- PIX_ADDR(&cursor->cr_work,0,0),
- cursor->cr_xwork,cursor->cr_ywork,
- GrWRITE
- );
- return;
- }
- GrEraseCursor(cursor);
- GrDisplayCursor(cursor);
- }
-