9 i_mmarray_cr(i_mmarray *ar,int l) {
14 alloc_size = sizeof(minmax) * l;
15 /* check for overflow */
16 if (alloc_size / l != sizeof(minmax)) {
17 fprintf(stderr, "overflow calculating memory allocation");
20 ar->data=mymalloc(alloc_size); /* checked 5jul05 tonyc */
21 for(i=0;i<l;i++) { ar->data[i].max=-1; ar->data[i].min=MAXINT; }
25 i_mmarray_dst(i_mmarray *ar) {
27 if (ar->data != NULL) { myfree(ar->data); ar->data=NULL; }
31 i_mmarray_add(i_mmarray *ar,int x,int y) {
32 if (y>-1 && y<ar->lines)
34 if (x<ar->data[y].min) ar->data[y].min=x;
35 if (x>ar->data[y].max) ar->data[y].max=x;
40 i_mmarray_gmin(i_mmarray *ar,int y) {
41 if (y>-1 && y<ar->lines) return ar->data[y].min;
46 i_mmarray_getm(i_mmarray *ar,int y) {
47 if (y>-1 && y<ar->lines) return ar->data[y].max;
52 i_mmarray_render(i_img *im,i_mmarray *ar,i_color *val) {
54 for(i=0;i<ar->lines;i++) if (ar->data[i].max!=-1) for(x=ar->data[i].min;x<ar->data[i].max;x++) i_ppix(im,x,i,val);
58 i_mmarray_render_fill(i_img *im,i_mmarray *ar,i_fill_t *fill) {
60 if (im->bits == i_8_bits && fill->fill_with_color) {
61 i_color *line = mymalloc(sizeof(i_color) * im->xsize); /* checked 5jul05 tonyc */
64 work = mymalloc(sizeof(i_color) * im->xsize); /* checked 5jul05 tonyc */
65 for(y=0;y<ar->lines;y++) {
66 if (ar->data[y].max!=-1) {
68 w = ar->data[y].max-ar->data[y].min;
71 i_glin(im, x, x+w, y, line);
72 (fill->fill_with_color)(fill, x, y, w, im->channels, work);
73 (fill->combine)(line, work, im->channels, w);
76 (fill->fill_with_color)(fill, x, y, w, im->channels, line);
78 i_plin(im, x, x+w, y, line);
87 i_fcolor *line = mymalloc(sizeof(i_fcolor) * im->xsize); /* checked 5jul05 tonyc */
88 i_fcolor *work = NULL;
90 work = mymalloc(sizeof(i_fcolor) * im->xsize); /* checked 5jul05 tonyc */
91 for(y=0;y<ar->lines;y++) {
92 if (ar->data[y].max!=-1) {
94 w = ar->data[y].max-ar->data[y].min;
97 i_glinf(im, x, x+w, y, line);
98 (fill->fill_with_fcolor)(fill, x, y, w, im->channels, work);
99 (fill->combinef)(line, work, im->channels, w);
102 (fill->fill_with_fcolor)(fill, x, y, w, im->channels, line);
104 i_plinf(im, x, x+w, y, line);
117 i_arcdraw(int x1, int y1, int x2, int y2, i_mmarray *ar) {
121 alpha=(double)(y2-y1)/(double)(x2-x1);
122 if (fabs(alpha) <= 1)
124 if (x2<x1) { temp=x1; x1=x2; x2=temp; temp=y1; y1=y2; y2=temp; }
128 i_mmarray_add(ar,x1,(int)(dsec+0.5));
136 if (y2<y1) { temp=x1; x1=x2; x2=temp; temp=y1; y1=y2; y2=temp; }
140 i_mmarray_add(ar,(int)(dsec+0.5),y1);
148 i_mmarray_info(i_mmarray *ar) {
150 for(i=0;i<ar->lines;i++)
151 if (ar->data[i].max!=-1) printf("line %d: min=%d, max=%d.\n",i,ar->data[i].min,ar->data[i].max);
155 i_arc_minmax(i_int_hlines *hlines,int x,int y,float rad,float d1,float d2) {
160 /*mm_log((1,"i_arc(im* 0x%x,x %d,y %d,rad %.2f,d1 %.2f,d2 %.2f,val 0x%x)\n",im,x,y,rad,d1,d2,val));*/
162 i_mmarray_cr(&dot, hlines->limit_y);
164 x1=(int)(x+0.5+rad*cos(d1*PI/180.0));
165 y1=(int)(y+0.5+rad*sin(d1*PI/180.0));
166 fx=(float)x1; fy=(float)y1;
168 /* printf("x1: %d.\ny1: %d.\n",x1,y1); */
169 i_arcdraw(x, y, x1, y1, &dot);
171 x1=(int)(x+0.5+rad*cos(d2*PI/180.0));
172 y1=(int)(y+0.5+rad*sin(d2*PI/180.0));
174 for(f=d1;f<=d2;f+=0.01) i_mmarray_add(&dot,(int)(x+0.5+rad*cos(f*PI/180.0)),(int)(y+0.5+rad*sin(f*PI/180.0)));
176 /* printf("x1: %d.\ny1: %d.\n",x1,y1); */
177 i_arcdraw(x, y, x1, y1, &dot);
179 /* render the minmax values onto the hlines */
180 for (y = 0; y < dot.lines; y++) {
181 if (dot.data[y].max!=-1) {
183 minx = dot.data[y].min;
184 width = dot.data[y].max - dot.data[y].min + 1;
185 i_int_hlines_add(hlines, y, minx, width);
194 i_arc_hlines(i_int_hlines *hlines,int x,int y,float rad,float d1,float d2) {
196 i_arc_minmax(hlines, x, y, rad, d1, d2);
199 i_arc_minmax(hlines, x, y, rad, d1, 360);
200 i_arc_minmax(hlines, x, y, rad, 0, d2);
205 =item i_arc(im, x, y, rad, d1, d2, color)
208 =synopsis i_arc(im, 50, 50, 20, 45, 135, &color);
210 Fills an arc centered at (x,y) with radius I<rad> covering the range
211 of angles in degrees from d1 to d2, with the color.
217 i_arc(i_img *im,int x,int y,float rad,float d1,float d2,const i_color *val) {
220 i_int_init_hlines_img(&hlines, im);
222 i_arc_hlines(&hlines, x, y, rad, d1, d2);
224 i_int_hlines_fill_color(im, &hlines, val);
226 i_int_hlines_destroy(&hlines);
230 =item i_arc_cfill(im, x, y, rad, d1, d2, fill)
233 =synopsis i_arc_cfill(im, 50, 50, 35, 90, 135, fill);
235 Fills an arc centered at (x,y) with radius I<rad> covering the range
236 of angles in degrees from d1 to d2, with the fill object.
241 #define MIN_CIRCLE_STEPS 8
242 #define MAX_CIRCLE_STEPS 360
245 i_arc_cfill(i_img *im,int x,int y,float rad,float d1,float d2,i_fill_t *fill) {
248 i_int_init_hlines_img(&hlines, im);
250 i_arc_hlines(&hlines, x, y, rad, d1, d2);
252 i_int_hlines_fill_fill(im, &hlines, fill);
254 i_int_hlines_destroy(&hlines);
258 arc_poly(int *count, double **xvals, double **yvals,
259 double x, double y, double rad, double d1, double d2) {
260 double d1_rad, d2_rad;
262 int steps, point_count;
265 /* normalize the angles */
268 if (d2 >= 360) { /* default is 361 */
282 d1_rad = d1 * PI / 180;
283 d2_rad = d2 * PI / 180;
285 /* how many segments for the curved part?
286 we do a maximum of one per degree, with a minimum of 8/circle
287 we try to aim at having about one segment per 2 pixels
288 Work it out per circle to get a step size.
290 I was originally making steps = circum/2 but that looked horrible.
292 I think there might be an issue in the polygon filler.
294 circum = 2 * PI * rad;
296 if (steps > MAX_CIRCLE_STEPS)
297 steps = MAX_CIRCLE_STEPS;
298 else if (steps < MIN_CIRCLE_STEPS)
299 steps = MIN_CIRCLE_STEPS;
301 angle_inc = 2 * PI / steps;
303 point_count = steps + 5; /* rough */
304 *xvals = mymalloc(point_count * sizeof(double));
305 *yvals = mymalloc(point_count * sizeof(double));
307 /* from centre to edge at d1 */
310 (*xvals)[1] = x + rad * cos(d1_rad);
311 (*yvals)[1] = y + rad * sin(d1_rad);
314 /* step around the curve */
315 while (d1_rad < d2_rad) {
316 (*xvals)[*count] = x + rad * cos(d1_rad);
317 (*yvals)[*count] = y + rad * sin(d1_rad);
322 /* finish off the curve */
323 (*xvals)[*count] = x + rad * cos(d2_rad);
324 (*yvals)[*count] = y + rad * sin(d2_rad);
329 =item i_arc_aa(im, x, y, rad, d1, d2, color)
332 =synopsis i_arc_aa(im, 50, 50, 35, 90, 135, &color);
334 Antialias fills an arc centered at (x,y) with radius I<rad> covering
335 the range of angles in degrees from d1 to d2, with the color.
341 i_arc_aa(i_img *im, double x, double y, double rad, double d1, double d2,
342 const i_color *val) {
343 double *xvals, *yvals;
346 arc_poly(&count, &xvals, &yvals, x, y, rad, d1, d2);
348 i_poly_aa(im, count, xvals, yvals, val);
355 =item i_arc_aa_cfill(im, x, y, rad, d1, d2, fill)
358 =synopsis i_arc_aa_cfill(im, 50, 50, 35, 90, 135, fill);
360 Antialias fills an arc centered at (x,y) with radius I<rad> covering
361 the range of angles in degrees from d1 to d2, with the fill object.
367 i_arc_aa_cfill(i_img *im, double x, double y, double rad, double d1, double d2,
369 double *xvals, *yvals;
372 arc_poly(&count, &xvals, &yvals, x, y, rad, d1, d2);
374 i_poly_aa_cfill(im, count, xvals, yvals, fill);
380 /* Temporary AA HACK */
384 static frac float_to_frac(float x) { return (frac)(0.5+x*16.0); }
385 static int frac_sub (frac x) { return (x%16); }
386 static int frac_int (frac x) { return (x/16); }
387 static float frac_to_float(float x) { return (float)x/16.0; }
391 polar_to_plane(float cx, float cy, float angle, float radius, frac *x, frac *y) {
392 *x = float_to_frac(cx+radius*cos(angle));
393 *y = float_to_frac(cy+radius*sin(angle));
398 order_pair(frac *x, frac *y) {
411 make_minmax_list(i_mmarray *dot, float x, float y, float radius) {
413 float astep = radius>0.1 ? .5/radius : 10;
414 frac cx, cy, lx, ly, sx, sy;
416 mm_log((1, "make_minmax_list(dot %p, x %.2f, y %.2f, radius %.2f)\n", dot, x, y, radius));
418 polar_to_plane(x, y, angle, radius, &sx, &sy);
420 for(angle = 0.0; angle<361; angle +=astep) {
422 polar_to_plane(x, y, angle, radius, &cx, &cy);
425 if (fabs(cx-lx) > fabs(cy-ly)) {
428 ccx = lx; lx = cx; cx = ccx;
429 ccy = ly; ly = cy; cy = ccy;
432 for(ccx=lx; ccx<=cx; ccx++) {
433 ccy = ly + ((cy-ly)*(ccx-lx))/(cx-lx);
434 i_mmarray_add(dot, ccx, ccy);
440 ccy = ly; ly = cy; cy = ccy;
441 ccx = lx; lx = cx; cx = ccx;
444 for(ccy=ly; ccy<=cy; ccy++) {
445 if (cy-ly) ccx = lx + ((cx-lx)*(ccy-ly))/(cy-ly); else ccx = lx;
446 i_mmarray_add(dot, ccx, ccy);
452 /* Get the number of subpixels covered */
456 i_pixel_coverage(i_mmarray *dot, int x, int y) {
462 for(cy=y*16; cy<(y+1)*16; cy++) {
463 frac tmin = dot->data[cy].min;
464 frac tmax = dot->data[cy].max;
466 if (tmax == -1 || tmin > maxx || tmax < minx) continue;
468 if (tmin < minx) tmin = minx;
469 if (tmax > maxx) tmax = maxx;
477 =item i_circle_aa(im, x, y, rad, color)
480 =synopsis i_circle_aa(im, 50, 50, 45, &color);
482 Antialias fills a circle centered at (x,y) for radius I<rad> with
488 i_circle_aa(i_img *im, float x, float y, float rad, const i_color *val) {
493 mm_log((1, "i_circle_aa(im %p, x %d, y %d, rad %.2f, val %p)\n", im, x, y, rad, val));
495 i_mmarray_cr(&dot,16*im->ysize);
496 make_minmax_list(&dot, x, y, rad);
498 for(ly = 0; ly<im->ysize; ly++) {
499 int ix, cy, minx = INT_MAX, maxx = INT_MIN;
501 /* Find the left/rightmost set subpixels */
502 for(cy = 0; cy<16; cy++) {
503 frac tmin = dot.data[ly*16+cy].min;
504 frac tmax = dot.data[ly*16+cy].max;
505 if (tmax == -1) continue;
507 if (minx > tmin) minx = tmin;
508 if (maxx < tmax) maxx = tmax;
511 if (maxx == INT_MIN) continue; /* no work to be done for this row of pixels */
515 for(ix=minx; ix<=maxx; ix++) {
516 int cnt = i_pixel_coverage(&dot, ix, ly);
517 if (cnt>255) cnt = 255;
518 if (cnt) { /* should never be true */
520 float ratio = (float)cnt/255.0;
521 i_gpix(im, ix, ly, &temp);
522 for(ch=0;ch<im->channels; ch++) temp.channel[ch] = (unsigned char)((float)val->channel[ch]*ratio + (float)temp.channel[ch]*(1.0-ratio));
523 i_ppix(im, ix, ly, &temp);
531 =item i_box(im, x1, y1, x2, y2, color)
534 =synopsis i_box(im, 0, 0, im->xsize-1, im->ysize-1, &color).
536 Outlines the box from (x1,y1) to (x2,y2) inclusive with I<color>.
542 i_box(i_img *im,int x1,int y1,int x2,int y2,const i_color *val) {
544 mm_log((1,"i_box(im* 0x%x,x1 %d,y1 %d,x2 %d,y2 %d,val 0x%x)\n",im,x1,y1,x2,y2,val));
545 for(x=x1;x<x2+1;x++) {
549 for(y=y1;y<y2+1;y++) {
556 =item i_box_filled(im, x1, y1, x2, y2, color)
559 =synopsis i_box_filled(im, 0, 0, im->xsize-1, im->ysize-1, &color);
561 Fills the box from (x1,y1) to (x2,y2) inclusive with color.
567 i_box_filled(i_img *im,int x1,int y1,int x2,int y2, const i_color *val) {
569 mm_log((1,"i_box_filled(im* 0x%x,x1 %d,y1 %d,x2 %d,y2 %d,val 0x%x)\n",im,x1,y1,x2,y2,val));
570 for(x=x1;x<x2+1;x++) for (y=y1;y<y2+1;y++) i_ppix(im,x,y,val);
574 =item i_box_cfill(im, x1, y1, x2, y2, fill)
577 =synopsis i_box_cfill(im, 0, 0, im->xsize-1, im->ysize-1, fill);
579 Fills the box from (x1,y1) to (x2,y2) inclusive with fill.
585 i_box_cfill(i_img *im,int x1,int y1,int x2,int y2,i_fill_t *fill) {
586 mm_log((1,"i_box_cfill(im* 0x%x,x1 %d,y1 %d,x2 %d,y2 %d,fill 0x%x)\n",im,x1,y1,x2,y2,fill));
597 if (x1 >= x2 || y1 > y2)
599 if (im->bits == i_8_bits && fill->fill_with_color) {
600 i_color *line = mymalloc(sizeof(i_color) * (x2 - x1)); /* checked 5jul05 tonyc */
601 i_color *work = NULL;
603 work = mymalloc(sizeof(i_color) * (x2-x1)); /* checked 5jul05 tonyc */
606 i_glin(im, x1, x2, y1, line);
607 (fill->fill_with_color)(fill, x1, y1, x2-x1, im->channels, work);
608 (fill->combine)(line, work, im->channels, x2-x1);
611 (fill->fill_with_color)(fill, x1, y1, x2-x1, im->channels, line);
613 i_plin(im, x1, x2, y1, line);
621 i_fcolor *line = mymalloc(sizeof(i_fcolor) * (x2 - x1)); /* checked 5jul05 tonyc */
623 work = mymalloc(sizeof(i_fcolor) * (x2 - x1)); /* checked 5jul05 tonyc */
627 i_glinf(im, x1, x2, y1, line);
628 (fill->fill_with_fcolor)(fill, x1, y1, x2-x1, im->channels, work);
629 (fill->combinef)(line, work, im->channels, x2-x1);
632 (fill->fill_with_fcolor)(fill, x1, y1, x2-x1, im->channels, line);
634 i_plinf(im, x1, x2, y1, line);
645 =item i_line(im, x1, y1, x2, y2, val, endp)
649 Draw a line to image using bresenhams linedrawing algorithm
651 im - image to draw to
652 x1 - starting x coordinate
653 y1 - starting x coordinate
654 x2 - starting x coordinate
655 y2 - starting x coordinate
656 val - color to write to image
657 endp - endpoint flag (boolean)
663 i_line(i_img *im, int x1, int y1, int x2, int y2, const i_color *val, int endp) {
672 /* choose variable to iterate on */
673 if (abs(dx)>abs(dy)) {
679 t = x1; x1 = x2; x2 = t;
680 t = y1; y1 = y2; y2 = t;
698 for(x=x1; x<x2-1; x++) {
705 i_ppix(im, x+1, y, val);
713 t = x1; x1 = x2; x2 = t;
714 t = y1; y1 = y2; y2 = t;
732 for(y=y1; y<y2-1; y++) {
739 i_ppix(im, x, y+1, val);
743 i_ppix(im, x1, y1, val);
744 i_ppix(im, x2, y2, val);
746 if (x1 != x2 || y1 != y2)
747 i_ppix(im, x1, y1, val);
753 i_line_dda(i_img *im, int x1, int y1, int x2, int y2, i_color *val) {
758 for(x=x1; x<=x2; x++) {
759 dy = y1+ (x-x1)/(float)(x2-x1)*(y2-y1);
760 i_ppix(im, x, (int)(dy+0.5), val);
791 i_line_aa3(i_img *im,int x1,int y1,int x2,int y2,i_color *val) {
795 int temp,dx,dy,isec,ch;
797 mm_log((1,"i_line_aa(im* 0x%x,x1 %d,y1 %d,x2 %d,y2 %d,val 0x%x)\n",im,x1,y1,x2,y2,val));
802 if (abs(dx)>abs(dy)) { /* alpha < 1 */
803 if (x2<x1) { temp=x1; x1=x2; x2=temp; temp=y1; y1=y2; y2=temp; }
804 alpha=(float)(y2-y1)/(float)(x2-x1);
810 /* dfrac=1-(1-dfrac)*(1-dfrac); */
811 /* This is something we can play with to try to get better looking lines */
813 i_gpix(im,x1,isec,&tval);
814 for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)(dfrac*(float)tval.channel[ch]+(1-dfrac)*(float)val->channel[ch]);
815 i_ppix(im,x1,isec,&tval);
817 i_gpix(im,x1,isec+1,&tval);
818 for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)((1-dfrac)*(float)tval.channel[ch]+dfrac*(float)val->channel[ch]);
819 i_ppix(im,x1,isec+1,&tval);
825 if (y2<y1) { temp=y1; y1=y2; y2=temp; temp=x1; x1=x2; x2=temp; }
826 alpha=(float)(x2-x1)/(float)(y2-y1);
831 /* dfrac=sqrt(dfrac); */
832 /* This is something we can play with */
833 i_gpix(im,isec,y1,&tval);
834 for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)(dfrac*(float)tval.channel[ch]+(1-dfrac)*(float)val->channel[ch]);
835 i_ppix(im,isec,y1,&tval);
837 i_gpix(im,isec+1,y1,&tval);
838 for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)((1-dfrac)*(float)tval.channel[ch]+dfrac*(float)val->channel[ch]);
839 i_ppix(im,isec+1,y1,&tval);
849 =item i_line_aa(im, x1, x2, y1, y2, color, endp)
853 Antialias draws a line from (x1,y1) to (x2, y2) in color.
855 The point (x2, y2) is drawn only if endp is set.
861 i_line_aa(i_img *im, int x1, int y1, int x2, int y2, const i_color *val, int endp) {
869 /* choose variable to iterate on */
870 if (abs(dx)>abs(dy)) {
876 t = x1; x1 = x2; x2 = t;
877 t = y1; y1 = y2; y2 = t;
891 p = dy2 - dx2; /* this has to be like this for AA */
895 for(x=x1; x<x2-1; x++) {
898 float t = (dy) ? -(float)(p)/(float)(dx2) : 1;
905 i_gpix(im,x+1,y,&tval);
906 for(ch=0;ch<im->channels;ch++)
907 tval.channel[ch]=(unsigned char)(t1*(float)tval.channel[ch]+t2*(float)val->channel[ch]);
908 i_ppix(im,x+1,y,&tval);
910 i_gpix(im,x+1,y+cpy,&tval);
911 for(ch=0;ch<im->channels;ch++)
912 tval.channel[ch]=(unsigned char)(t2*(float)tval.channel[ch]+t1*(float)val->channel[ch]);
913 i_ppix(im,x+1,y+cpy,&tval);
928 t = x1; x1 = x2; x2 = t;
929 t = y1; y1 = y2; y2 = t;
943 p = dx2 - dy2; /* this has to be like this for AA */
947 for(y=y1; y<y2-1; y++) {
950 float t = (dx) ? -(float)(p)/(float)(dy2) : 1;
957 i_gpix(im,x,y+1,&tval);
958 for(ch=0;ch<im->channels;ch++)
959 tval.channel[ch]=(unsigned char)(t1*(float)tval.channel[ch]+t2*(float)val->channel[ch]);
960 i_ppix(im,x,y+1,&tval);
962 i_gpix(im,x+cpx,y+1,&tval);
963 for(ch=0;ch<im->channels;ch++)
964 tval.channel[ch]=(unsigned char)(t2*(float)tval.channel[ch]+t1*(float)val->channel[ch]);
965 i_ppix(im,x+cpx,y+1,&tval);
978 i_ppix(im, x1, y1, val);
979 i_ppix(im, x2, y2, val);
981 if (x1 != x2 || y1 != y2)
982 i_ppix(im, x1, y1, val);
993 for(i=k+1;i<=n;i++) r*=i;
994 for(i=1;i<=(n-k);i++) r/=i;
999 /* Note in calculating t^k*(1-t)^(n-k)
1000 we can start by using t^0=1 so this simplifies to
1001 t^0*(1-t)^n - we want to multiply that with t/(1-t) each iteration
1002 to get a new level - this may lead to errors who knows lets test it */
1005 i_bezier_multi(i_img *im,int l,const double *x,const double *y, const i_color *val) {
1013 /* this is the same size as the x and y arrays, so shouldn't overflow */
1014 bzcoef=mymalloc(sizeof(double)*l); /* checked 5jul05 tonyc */
1015 for(k=0;k<l;k++) bzcoef[k]=perm(n,k);
1019 /* for(k=0;k<l;k++) printf("bzcoef: %d -> %f\n",k,bzcoef[k]); */
1021 for(t=0;t<=1;t+=0.005) {
1026 /* cx+=bzcoef[k]*x[k]*pow(t,k)*pow(1-t,n-k);
1027 cy+=bzcoef[k]*y[k]*pow(t,k)*pow(1-t,n-k);*/
1029 cx+=bzcoef[k]*x[k]*ccoef;
1030 cy+=bzcoef[k]*y[k]*ccoef;
1033 /* printf("%f -> (%d,%d)\n",t,(int)(0.5+cx),(int)(0.5+cy)); */
1035 i_line_aa(im,lx,ly,(int)(0.5+cx),(int)(0.5+cy),val, 1);
1037 /* i_ppix(im,(int)(0.5+cx),(int)(0.5+cy),val); */
1047 REF: Graphics Gems I. page 282+
1051 /* This should be moved into a seperate file? */
1053 /* This is the truncation used:
1055 a double is multiplied by 16 and then truncated.
1056 This means that 0 -> 0
1057 So a triangle of (0,0) (10,10) (10,0) Will look like it's
1058 not filling the (10,10) point nor the (10,0)-(10,10) line segment
1063 /* Flood fill algorithm - based on the Ken Fishkins (pixar) gem in
1078 struct stack_element {
1086 /* create the link data to put push onto the stack */
1089 struct stack_element*
1090 crdata(int left,int right,int dadl,int dadr,int y, int dir) {
1091 struct stack_element *ste;
1092 ste = mymalloc(sizeof(struct stack_element)); /* checked 5jul05 tonyc */
1098 ste->myDirection = dir;
1102 /* i_ccomp compares two colors and gives true if they are the same */
1105 i_ccomp(i_color *val1,i_color *val2,int ch) {
1107 for(i=0;i<ch;i++) if (val1->channel[i] !=val2->channel[i]) return 0;
1113 i_lspan(i_img *im, int seedx, int seedy, i_color *val) {
1116 if (seedx-1 < 0) break;
1117 i_gpix(im,seedx-1,seedy,&cval);
1118 if (!i_ccomp(val,&cval,im->channels)) break;
1125 i_rspan(i_img *im, int seedx, int seedy, i_color *val) {
1128 if (seedx+1 > im->xsize-1) break;
1129 i_gpix(im,seedx+1,seedy,&cval);
1130 if (!i_ccomp(val,&cval,im->channels)) break;
1136 /* Macro to create a link and push on to the list */
1138 #define ST_PUSH(left,right,dadl,dadr,y,dir) do { \
1139 struct stack_element *s = crdata(left,right,dadl,dadr,y,dir); \
1140 llist_push(st,&s); \
1143 /* pops the shadow on TOS into local variables lx,rx,y,direction,dadLx and dadRx */
1144 /* No overflow check! */
1146 #define ST_POP() do { \
1147 struct stack_element *s; \
1154 direction = s->myDirection; \
1158 #define ST_STACK(dir,dadLx,dadRx,lx,rx,y) do { \
1159 int pushrx = rx+1; \
1160 int pushlx = lx-1; \
1161 ST_PUSH(lx,rx,pushlx,pushrx,y+dir,dir); \
1163 ST_PUSH(dadRx+1,rx,pushlx,pushrx,y-dir,-dir); \
1164 if (lx < dadLx) ST_PUSH(lx,dadLx-1,pushlx,pushrx,y-dir,-dir); \
1167 #define SET(x,y) btm_set(btm,x,y)
1169 /* INSIDE returns true if pixel is correct color and we haven't set it before. */
1170 #define INSIDE(x,y) ((!btm_test(btm,x,y) && ( i_gpix(im,x,y,&cval),i_ccomp(&val,&cval,channels) ) ))
1174 /* The function that does all the real work */
1176 static struct i_bitmap *
1177 i_flood_fill_low(i_img *im,int seedx,int seedy,
1178 int *bxminp, int *bxmaxp, int *byminp, int *bymaxp) {
1196 struct i_bitmap *btm;
1198 int channels,xsize,ysize;
1201 channels = im->channels;
1205 btm = btm_new(xsize, ysize);
1206 st = llist_new(100, sizeof(struct stack_element*));
1208 /* Get the reference color */
1209 i_gpix(im, seedx, seedy, &val);
1211 /* Find the starting span and fill it */
1212 ltx = i_lspan(im, seedx, seedy, &val);
1213 rtx = i_rspan(im, seedx, seedy, &val);
1214 for(tx=ltx; tx<=rtx; tx++) SET(tx, seedy);
1216 ST_PUSH(ltx, rtx, ltx, rtx, seedy+1, 1);
1217 ST_PUSH(ltx, rtx, ltx, rtx, seedy-1, -1);
1220 /* Stack variables */
1229 ST_POP(); /* sets lx, rx, dadLx, dadRx, y, direction */
1232 if (y<0 || y>ysize-1) continue;
1233 if (bymin > y) bymin=y; /* in the worst case an extra line */
1234 if (bymax < y) bymax=y;
1238 if ( lx >= 0 && (wasIn = INSIDE(lx, y)) ) {
1241 while(INSIDE(lx, y) && lx > 0) {
1247 if (bxmin > lx) bxmin = lx;
1248 while(x <= xsize-1) {
1249 /* printf("x=%d\n",x); */
1253 /* case 1: was inside, am still inside */
1256 /* case 2: was inside, am no longer inside: just found the
1257 right edge of a span */
1258 ST_STACK(direction, dadLx, dadRx, lx, (x-1), y);
1260 if (bxmax < x) bxmax = x;
1264 if (x > rx) goto EXT;
1267 /* case 3: Wasn't inside, am now: just found the start of a new run */
1271 /* case 4: Wasn't inside, still isn't */
1276 EXT: /* out of loop */
1278 /* hit an edge of the frame buffer while inside a run */
1279 ST_STACK(direction, dadLx, dadRx, lx, (x-1), y);
1280 if (bxmax < x) bxmax = x;
1295 =item i_flood_fill(im, seedx, seedy, color)
1298 =synopsis i_flood_fill(im, 50, 50, &color);
1300 Flood fills the 4-connected region starting from the point (seedx,
1301 seedy) with I<color>.
1303 Returns false if (seedx, seedy) are outside the image.
1309 i_flood_fill(i_img *im, int seedx, int seedy, const i_color *dcol) {
1310 int bxmin, bxmax, bymin, bymax;
1311 struct i_bitmap *btm;
1315 if (seedx < 0 || seedx >= im->xsize ||
1316 seedy < 0 || seedy >= im->ysize) {
1317 i_push_error(0, "i_flood_cfill: Seed pixel outside of image");
1321 btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax);
1323 for(y=bymin;y<=bymax;y++)
1324 for(x=bxmin;x<=bxmax;x++)
1325 if (btm_test(btm,x,y))
1326 i_ppix(im,x,y,dcol);
1332 =item i_flood_cfill(im, seedx, seedy, fill)
1335 =synopsis i_flood_cfill(im, 50, 50, fill);
1337 Flood fills the 4-connected region starting from the point (seedx,
1338 seedy) with I<fill>.
1340 Returns false if (seedx, seedy) are outside the image.
1346 i_flood_cfill(i_img *im, int seedx, int seedy, i_fill_t *fill) {
1347 int bxmin, bxmax, bymin, bymax;
1348 struct i_bitmap *btm;
1354 if (seedx < 0 || seedx >= im->xsize ||
1355 seedy < 0 || seedy >= im->ysize) {
1356 i_push_error(0, "i_flood_cfill: Seed pixel outside of image");
1360 btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax);
1362 if (im->bits == i_8_bits && fill->fill_with_color) {
1363 /* bxmax/bxmin are inside the image, hence this won't overflow */
1364 i_color *line = mymalloc(sizeof(i_color) * (bxmax - bxmin)); /* checked 5jul05 tonyc */
1365 i_color *work = NULL;
1367 work = mymalloc(sizeof(i_color) * (bxmax - bxmin)); /* checked 5jul05 tonyc */
1369 for(y=bymin; y<=bymax; y++) {
1372 while (x < bxmax && !btm_test(btm, x, y)) {
1375 if (btm_test(btm, x, y)) {
1377 while (x < bxmax && btm_test(btm, x, y)) {
1380 if (fill->combine) {
1381 i_glin(im, start, x, y, line);
1382 (fill->fill_with_color)(fill, start, y, x-start, im->channels,
1384 (fill->combine)(line, work, im->channels, x-start);
1387 (fill->fill_with_color)(fill, start, y, x-start, im->channels,
1390 i_plin(im, start, x, y, line);
1399 /* bxmax/bxmin are inside the image, hence this won't overflow */
1400 i_fcolor *line = mymalloc(sizeof(i_fcolor) * (bxmax - bxmin)); /* checked 5jul05 tonyc */
1401 i_fcolor *work = NULL;
1403 work = mymalloc(sizeof(i_fcolor) * (bxmax - bxmin)); /* checked 5jul05 tonyc */
1405 for(y=bymin;y<=bymax;y++) {
1408 while (x < bxmax && !btm_test(btm, x, y)) {
1411 if (btm_test(btm, x, y)) {
1413 while (x < bxmax && btm_test(btm, x, y)) {
1416 if (fill->combinef) {
1417 i_glinf(im, start, x, y, line);
1418 (fill->fill_with_fcolor)(fill, start, y, x-start, im->channels,
1420 (fill->combinef)(line, work, im->channels, x-start);
1423 (fill->fill_with_fcolor)(fill, start, y, x-start, im->channels,
1426 i_plinf(im, start, x, y, line);