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 /* point_count is always relatively small, so allocation won't overflow */
305 *xvals = mymalloc(point_count * sizeof(double)); /* checked 17feb2005 tonyc */
306 *yvals = mymalloc(point_count * sizeof(double)); /* checked 17feb2005 tonyc */
308 /* from centre to edge at d1 */
311 (*xvals)[1] = x + rad * cos(d1_rad);
312 (*yvals)[1] = y + rad * sin(d1_rad);
315 /* step around the curve */
316 while (d1_rad < d2_rad) {
317 (*xvals)[*count] = x + rad * cos(d1_rad);
318 (*yvals)[*count] = y + rad * sin(d1_rad);
323 /* finish off the curve */
324 (*xvals)[*count] = x + rad * cos(d2_rad);
325 (*yvals)[*count] = y + rad * sin(d2_rad);
330 =item i_arc_aa(im, x, y, rad, d1, d2, color)
333 =synopsis i_arc_aa(im, 50, 50, 35, 90, 135, &color);
335 Antialias fills an arc centered at (x,y) with radius I<rad> covering
336 the range of angles in degrees from d1 to d2, with the color.
342 i_arc_aa(i_img *im, double x, double y, double rad, double d1, double d2,
343 const i_color *val) {
344 double *xvals, *yvals;
347 arc_poly(&count, &xvals, &yvals, x, y, rad, d1, d2);
349 i_poly_aa(im, count, xvals, yvals, val);
356 =item i_arc_aa_cfill(im, x, y, rad, d1, d2, fill)
359 =synopsis i_arc_aa_cfill(im, 50, 50, 35, 90, 135, fill);
361 Antialias fills an arc centered at (x,y) with radius I<rad> covering
362 the range of angles in degrees from d1 to d2, with the fill object.
368 i_arc_aa_cfill(i_img *im, double x, double y, double rad, double d1, double d2,
370 double *xvals, *yvals;
373 arc_poly(&count, &xvals, &yvals, x, y, rad, d1, d2);
375 i_poly_aa_cfill(im, count, xvals, yvals, fill);
381 /* Temporary AA HACK */
385 static frac float_to_frac(float x) { return (frac)(0.5+x*16.0); }
389 polar_to_plane(float cx, float cy, float angle, float radius, frac *x, frac *y) {
390 *x = float_to_frac(cx+radius*cos(angle));
391 *y = float_to_frac(cy+radius*sin(angle));
396 make_minmax_list(i_mmarray *dot, float x, float y, float radius) {
398 float astep = radius>0.1 ? .5/radius : 10;
399 frac cx, cy, lx, ly, sx, sy;
401 mm_log((1, "make_minmax_list(dot %p, x %.2f, y %.2f, radius %.2f)\n", dot, x, y, radius));
403 polar_to_plane(x, y, angle, radius, &sx, &sy);
405 for(angle = 0.0; angle<361; angle +=astep) {
407 polar_to_plane(x, y, angle, radius, &cx, &cy);
410 if (fabs(cx-lx) > fabs(cy-ly)) {
413 ccx = lx; lx = cx; cx = ccx;
414 ccy = ly; ly = cy; cy = ccy;
417 for(ccx=lx; ccx<=cx; ccx++) {
418 ccy = ly + ((cy-ly)*(ccx-lx))/(cx-lx);
419 i_mmarray_add(dot, ccx, ccy);
425 ccy = ly; ly = cy; cy = ccy;
426 ccx = lx; lx = cx; cx = ccx;
429 for(ccy=ly; ccy<=cy; ccy++) {
430 if (cy-ly) ccx = lx + ((cx-lx)*(ccy-ly))/(cy-ly); else ccx = lx;
431 i_mmarray_add(dot, ccx, ccy);
437 /* Get the number of subpixels covered */
441 i_pixel_coverage(i_mmarray *dot, int x, int y) {
447 for(cy=y*16; cy<(y+1)*16; cy++) {
448 frac tmin = dot->data[cy].min;
449 frac tmax = dot->data[cy].max;
451 if (tmax == -1 || tmin > maxx || tmax < minx) continue;
453 if (tmin < minx) tmin = minx;
454 if (tmax > maxx) tmax = maxx;
462 =item i_circle_aa(im, x, y, rad, color)
465 =synopsis i_circle_aa(im, 50, 50, 45, &color);
467 Antialias fills a circle centered at (x,y) for radius I<rad> with
473 i_circle_aa(i_img *im, float x, float y, float rad, const i_color *val) {
478 mm_log((1, "i_circle_aa(im %p, x %d, y %d, rad %.2f, val %p)\n", im, x, y, rad, val));
480 i_mmarray_cr(&dot,16*im->ysize);
481 make_minmax_list(&dot, x, y, rad);
483 for(ly = 0; ly<im->ysize; ly++) {
484 int ix, cy, minx = INT_MAX, maxx = INT_MIN;
486 /* Find the left/rightmost set subpixels */
487 for(cy = 0; cy<16; cy++) {
488 frac tmin = dot.data[ly*16+cy].min;
489 frac tmax = dot.data[ly*16+cy].max;
490 if (tmax == -1) continue;
492 if (minx > tmin) minx = tmin;
493 if (maxx < tmax) maxx = tmax;
496 if (maxx == INT_MIN) continue; /* no work to be done for this row of pixels */
500 for(ix=minx; ix<=maxx; ix++) {
501 int cnt = i_pixel_coverage(&dot, ix, ly);
502 if (cnt>255) cnt = 255;
503 if (cnt) { /* should never be true */
505 float ratio = (float)cnt/255.0;
506 i_gpix(im, ix, ly, &temp);
507 for(ch=0;ch<im->channels; ch++) temp.channel[ch] = (unsigned char)((float)val->channel[ch]*ratio + (float)temp.channel[ch]*(1.0-ratio));
508 i_ppix(im, ix, ly, &temp);
516 =item i_box(im, x1, y1, x2, y2, color)
519 =synopsis i_box(im, 0, 0, im->xsize-1, im->ysize-1, &color).
521 Outlines the box from (x1,y1) to (x2,y2) inclusive with I<color>.
527 i_box(i_img *im,int x1,int y1,int x2,int y2,const i_color *val) {
529 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));
530 for(x=x1;x<x2+1;x++) {
534 for(y=y1;y<y2+1;y++) {
541 =item i_box_filled(im, x1, y1, x2, y2, color)
544 =synopsis i_box_filled(im, 0, 0, im->xsize-1, im->ysize-1, &color);
546 Fills the box from (x1,y1) to (x2,y2) inclusive with color.
552 i_box_filled(i_img *im,int x1,int y1,int x2,int y2, const i_color *val) {
554 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));
555 for(x=x1;x<x2+1;x++) for (y=y1;y<y2+1;y++) i_ppix(im,x,y,val);
559 =item i_box_cfill(im, x1, y1, x2, y2, fill)
562 =synopsis i_box_cfill(im, 0, 0, im->xsize-1, im->ysize-1, fill);
564 Fills the box from (x1,y1) to (x2,y2) inclusive with fill.
570 i_box_cfill(i_img *im,int x1,int y1,int x2,int y2,i_fill_t *fill) {
571 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));
582 if (x1 >= x2 || y1 > y2)
584 if (im->bits == i_8_bits && fill->fill_with_color) {
585 i_color *line = mymalloc(sizeof(i_color) * (x2 - x1)); /* checked 5jul05 tonyc */
586 i_color *work = NULL;
588 work = mymalloc(sizeof(i_color) * (x2-x1)); /* checked 5jul05 tonyc */
591 i_glin(im, x1, x2, y1, line);
592 (fill->fill_with_color)(fill, x1, y1, x2-x1, im->channels, work);
593 (fill->combine)(line, work, im->channels, x2-x1);
596 (fill->fill_with_color)(fill, x1, y1, x2-x1, im->channels, line);
598 i_plin(im, x1, x2, y1, line);
606 i_fcolor *line = mymalloc(sizeof(i_fcolor) * (x2 - x1)); /* checked 5jul05 tonyc */
608 work = mymalloc(sizeof(i_fcolor) * (x2 - x1)); /* checked 5jul05 tonyc */
612 i_glinf(im, x1, x2, y1, line);
613 (fill->fill_with_fcolor)(fill, x1, y1, x2-x1, im->channels, work);
614 (fill->combinef)(line, work, im->channels, x2-x1);
617 (fill->fill_with_fcolor)(fill, x1, y1, x2-x1, im->channels, line);
619 i_plinf(im, x1, x2, y1, line);
630 =item i_line(im, x1, y1, x2, y2, val, endp)
634 Draw a line to image using bresenhams linedrawing algorithm
636 im - image to draw to
637 x1 - starting x coordinate
638 y1 - starting x coordinate
639 x2 - starting x coordinate
640 y2 - starting x coordinate
641 val - color to write to image
642 endp - endpoint flag (boolean)
648 i_line(i_img *im, int x1, int y1, int x2, int y2, const i_color *val, int endp) {
657 /* choose variable to iterate on */
658 if (abs(dx)>abs(dy)) {
664 t = x1; x1 = x2; x2 = t;
665 t = y1; y1 = y2; y2 = t;
683 for(x=x1; x<x2-1; x++) {
690 i_ppix(im, x+1, y, val);
698 t = x1; x1 = x2; x2 = t;
699 t = y1; y1 = y2; y2 = t;
717 for(y=y1; y<y2-1; y++) {
724 i_ppix(im, x, y+1, val);
728 i_ppix(im, x1, y1, val);
729 i_ppix(im, x2, y2, val);
731 if (x1 != x2 || y1 != y2)
732 i_ppix(im, x1, y1, val);
738 i_line_dda(i_img *im, int x1, int y1, int x2, int y2, i_color *val) {
743 for(x=x1; x<=x2; x++) {
744 dy = y1+ (x-x1)/(float)(x2-x1)*(y2-y1);
745 i_ppix(im, x, (int)(dy+0.5), val);
776 i_line_aa3(i_img *im,int x1,int y1,int x2,int y2,i_color *val) {
780 int temp,dx,dy,isec,ch;
782 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));
787 if (abs(dx)>abs(dy)) { /* alpha < 1 */
788 if (x2<x1) { temp=x1; x1=x2; x2=temp; temp=y1; y1=y2; y2=temp; }
789 alpha=(float)(y2-y1)/(float)(x2-x1);
795 /* dfrac=1-(1-dfrac)*(1-dfrac); */
796 /* This is something we can play with to try to get better looking lines */
798 i_gpix(im,x1,isec,&tval);
799 for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)(dfrac*(float)tval.channel[ch]+(1-dfrac)*(float)val->channel[ch]);
800 i_ppix(im,x1,isec,&tval);
802 i_gpix(im,x1,isec+1,&tval);
803 for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)((1-dfrac)*(float)tval.channel[ch]+dfrac*(float)val->channel[ch]);
804 i_ppix(im,x1,isec+1,&tval);
810 if (y2<y1) { temp=y1; y1=y2; y2=temp; temp=x1; x1=x2; x2=temp; }
811 alpha=(float)(x2-x1)/(float)(y2-y1);
816 /* dfrac=sqrt(dfrac); */
817 /* This is something we can play with */
818 i_gpix(im,isec,y1,&tval);
819 for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)(dfrac*(float)tval.channel[ch]+(1-dfrac)*(float)val->channel[ch]);
820 i_ppix(im,isec,y1,&tval);
822 i_gpix(im,isec+1,y1,&tval);
823 for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)((1-dfrac)*(float)tval.channel[ch]+dfrac*(float)val->channel[ch]);
824 i_ppix(im,isec+1,y1,&tval);
834 =item i_line_aa(im, x1, x2, y1, y2, color, endp)
838 Antialias draws a line from (x1,y1) to (x2, y2) in color.
840 The point (x2, y2) is drawn only if endp is set.
846 i_line_aa(i_img *im, int x1, int y1, int x2, int y2, const i_color *val, int endp) {
854 /* choose variable to iterate on */
855 if (abs(dx)>abs(dy)) {
861 t = x1; x1 = x2; x2 = t;
862 t = y1; y1 = y2; y2 = t;
876 p = dy2 - dx2; /* this has to be like this for AA */
880 for(x=x1; x<x2-1; x++) {
883 float t = (dy) ? -(float)(p)/(float)(dx2) : 1;
890 i_gpix(im,x+1,y,&tval);
891 for(ch=0;ch<im->channels;ch++)
892 tval.channel[ch]=(unsigned char)(t1*(float)tval.channel[ch]+t2*(float)val->channel[ch]);
893 i_ppix(im,x+1,y,&tval);
895 i_gpix(im,x+1,y+cpy,&tval);
896 for(ch=0;ch<im->channels;ch++)
897 tval.channel[ch]=(unsigned char)(t2*(float)tval.channel[ch]+t1*(float)val->channel[ch]);
898 i_ppix(im,x+1,y+cpy,&tval);
913 t = x1; x1 = x2; x2 = t;
914 t = y1; y1 = y2; y2 = t;
928 p = dx2 - dy2; /* this has to be like this for AA */
932 for(y=y1; y<y2-1; y++) {
935 float t = (dx) ? -(float)(p)/(float)(dy2) : 1;
942 i_gpix(im,x,y+1,&tval);
943 for(ch=0;ch<im->channels;ch++)
944 tval.channel[ch]=(unsigned char)(t1*(float)tval.channel[ch]+t2*(float)val->channel[ch]);
945 i_ppix(im,x,y+1,&tval);
947 i_gpix(im,x+cpx,y+1,&tval);
948 for(ch=0;ch<im->channels;ch++)
949 tval.channel[ch]=(unsigned char)(t2*(float)tval.channel[ch]+t1*(float)val->channel[ch]);
950 i_ppix(im,x+cpx,y+1,&tval);
963 i_ppix(im, x1, y1, val);
964 i_ppix(im, x2, y2, val);
966 if (x1 != x2 || y1 != y2)
967 i_ppix(im, x1, y1, val);
978 for(i=k+1;i<=n;i++) r*=i;
979 for(i=1;i<=(n-k);i++) r/=i;
984 /* Note in calculating t^k*(1-t)^(n-k)
985 we can start by using t^0=1 so this simplifies to
986 t^0*(1-t)^n - we want to multiply that with t/(1-t) each iteration
987 to get a new level - this may lead to errors who knows lets test it */
990 i_bezier_multi(i_img *im,int l,const double *x,const double *y, const i_color *val) {
998 /* this is the same size as the x and y arrays, so shouldn't overflow */
999 bzcoef=mymalloc(sizeof(double)*l); /* checked 5jul05 tonyc */
1000 for(k=0;k<l;k++) bzcoef[k]=perm(n,k);
1004 /* for(k=0;k<l;k++) printf("bzcoef: %d -> %f\n",k,bzcoef[k]); */
1006 for(t=0;t<=1;t+=0.005) {
1011 /* cx+=bzcoef[k]*x[k]*pow(t,k)*pow(1-t,n-k);
1012 cy+=bzcoef[k]*y[k]*pow(t,k)*pow(1-t,n-k);*/
1014 cx+=bzcoef[k]*x[k]*ccoef;
1015 cy+=bzcoef[k]*y[k]*ccoef;
1018 /* printf("%f -> (%d,%d)\n",t,(int)(0.5+cx),(int)(0.5+cy)); */
1020 i_line_aa(im,lx,ly,(int)(0.5+cx),(int)(0.5+cy),val, 1);
1022 /* i_ppix(im,(int)(0.5+cx),(int)(0.5+cy),val); */
1032 REF: Graphics Gems I. page 282+
1036 /* This should be moved into a seperate file? */
1038 /* This is the truncation used:
1040 a double is multiplied by 16 and then truncated.
1041 This means that 0 -> 0
1042 So a triangle of (0,0) (10,10) (10,0) Will look like it's
1043 not filling the (10,10) point nor the (10,0)-(10,10) line segment
1048 /* Flood fill algorithm - based on the Ken Fishkins (pixar) gem in
1063 struct stack_element {
1071 /* create the link data to put push onto the stack */
1074 struct stack_element*
1075 crdata(int left,int right,int dadl,int dadr,int y, int dir) {
1076 struct stack_element *ste;
1077 ste = mymalloc(sizeof(struct stack_element)); /* checked 5jul05 tonyc */
1083 ste->myDirection = dir;
1087 /* i_ccomp compares two colors and gives true if they are the same */
1090 i_ccomp(i_color *val1,i_color *val2,int ch) {
1092 for(i=0;i<ch;i++) if (val1->channel[i] !=val2->channel[i]) return 0;
1098 i_lspan(i_img *im, int seedx, int seedy, i_color *val) {
1101 if (seedx-1 < 0) break;
1102 i_gpix(im,seedx-1,seedy,&cval);
1103 if (!i_ccomp(val,&cval,im->channels)) break;
1110 i_rspan(i_img *im, int seedx, int seedy, i_color *val) {
1113 if (seedx+1 > im->xsize-1) break;
1114 i_gpix(im,seedx+1,seedy,&cval);
1115 if (!i_ccomp(val,&cval,im->channels)) break;
1121 /* Macro to create a link and push on to the list */
1123 #define ST_PUSH(left,right,dadl,dadr,y,dir) do { \
1124 struct stack_element *s = crdata(left,right,dadl,dadr,y,dir); \
1125 llist_push(st,&s); \
1128 /* pops the shadow on TOS into local variables lx,rx,y,direction,dadLx and dadRx */
1129 /* No overflow check! */
1131 #define ST_POP() do { \
1132 struct stack_element *s; \
1139 direction = s->myDirection; \
1143 #define ST_STACK(dir,dadLx,dadRx,lx,rx,y) do { \
1144 int pushrx = rx+1; \
1145 int pushlx = lx-1; \
1146 ST_PUSH(lx,rx,pushlx,pushrx,y+dir,dir); \
1148 ST_PUSH(dadRx+1,rx,pushlx,pushrx,y-dir,-dir); \
1149 if (lx < dadLx) ST_PUSH(lx,dadLx-1,pushlx,pushrx,y-dir,-dir); \
1152 #define SET(x,y) btm_set(btm,x,y)
1154 /* INSIDE returns true if pixel is correct color and we haven't set it before. */
1155 #define INSIDE(x,y) ((!btm_test(btm,x,y) && ( i_gpix(im,x,y,&cval),i_ccomp(&val,&cval,channels) ) ))
1159 /* The function that does all the real work */
1161 static struct i_bitmap *
1162 i_flood_fill_low(i_img *im,int seedx,int seedy,
1163 int *bxminp, int *bxmaxp, int *byminp, int *bymaxp) {
1181 struct i_bitmap *btm;
1183 int channels,xsize,ysize;
1186 channels = im->channels;
1190 btm = btm_new(xsize, ysize);
1191 st = llist_new(100, sizeof(struct stack_element*));
1193 /* Get the reference color */
1194 i_gpix(im, seedx, seedy, &val);
1196 /* Find the starting span and fill it */
1197 ltx = i_lspan(im, seedx, seedy, &val);
1198 rtx = i_rspan(im, seedx, seedy, &val);
1199 for(tx=ltx; tx<=rtx; tx++) SET(tx, seedy);
1201 ST_PUSH(ltx, rtx, ltx, rtx, seedy+1, 1);
1202 ST_PUSH(ltx, rtx, ltx, rtx, seedy-1, -1);
1205 /* Stack variables */
1214 ST_POP(); /* sets lx, rx, dadLx, dadRx, y, direction */
1217 if (y<0 || y>ysize-1) continue;
1218 if (bymin > y) bymin=y; /* in the worst case an extra line */
1219 if (bymax < y) bymax=y;
1223 if ( lx >= 0 && (wasIn = INSIDE(lx, y)) ) {
1226 while(INSIDE(lx, y) && lx > 0) {
1232 if (bxmin > lx) bxmin = lx;
1233 while(x <= xsize-1) {
1234 /* printf("x=%d\n",x); */
1238 /* case 1: was inside, am still inside */
1241 /* case 2: was inside, am no longer inside: just found the
1242 right edge of a span */
1243 ST_STACK(direction, dadLx, dadRx, lx, (x-1), y);
1245 if (bxmax < x) bxmax = x;
1249 if (x > rx) goto EXT;
1252 /* case 3: Wasn't inside, am now: just found the start of a new run */
1256 /* case 4: Wasn't inside, still isn't */
1261 EXT: /* out of loop */
1263 /* hit an edge of the frame buffer while inside a run */
1264 ST_STACK(direction, dadLx, dadRx, lx, (x-1), y);
1265 if (bxmax < x) bxmax = x;
1280 =item i_flood_fill(im, seedx, seedy, color)
1283 =synopsis i_flood_fill(im, 50, 50, &color);
1285 Flood fills the 4-connected region starting from the point (seedx,
1286 seedy) with I<color>.
1288 Returns false if (seedx, seedy) are outside the image.
1294 i_flood_fill(i_img *im, int seedx, int seedy, const i_color *dcol) {
1295 int bxmin, bxmax, bymin, bymax;
1296 struct i_bitmap *btm;
1300 if (seedx < 0 || seedx >= im->xsize ||
1301 seedy < 0 || seedy >= im->ysize) {
1302 i_push_error(0, "i_flood_cfill: Seed pixel outside of image");
1306 btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax);
1308 for(y=bymin;y<=bymax;y++)
1309 for(x=bxmin;x<=bxmax;x++)
1310 if (btm_test(btm,x,y))
1311 i_ppix(im,x,y,dcol);
1317 =item i_flood_cfill(im, seedx, seedy, fill)
1320 =synopsis i_flood_cfill(im, 50, 50, fill);
1322 Flood fills the 4-connected region starting from the point (seedx,
1323 seedy) with I<fill>.
1325 Returns false if (seedx, seedy) are outside the image.
1331 i_flood_cfill(i_img *im, int seedx, int seedy, i_fill_t *fill) {
1332 int bxmin, bxmax, bymin, bymax;
1333 struct i_bitmap *btm;
1339 if (seedx < 0 || seedx >= im->xsize ||
1340 seedy < 0 || seedy >= im->ysize) {
1341 i_push_error(0, "i_flood_cfill: Seed pixel outside of image");
1345 btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax);
1347 if (im->bits == i_8_bits && fill->fill_with_color) {
1348 /* bxmax/bxmin are inside the image, hence this won't overflow */
1349 i_color *line = mymalloc(sizeof(i_color) * (bxmax - bxmin)); /* checked 5jul05 tonyc */
1350 i_color *work = NULL;
1352 work = mymalloc(sizeof(i_color) * (bxmax - bxmin)); /* checked 5jul05 tonyc */
1354 for(y=bymin; y<=bymax; y++) {
1357 while (x < bxmax && !btm_test(btm, x, y)) {
1360 if (btm_test(btm, x, y)) {
1362 while (x < bxmax && btm_test(btm, x, y)) {
1365 if (fill->combine) {
1366 i_glin(im, start, x, y, line);
1367 (fill->fill_with_color)(fill, start, y, x-start, im->channels,
1369 (fill->combine)(line, work, im->channels, x-start);
1372 (fill->fill_with_color)(fill, start, y, x-start, im->channels,
1375 i_plin(im, start, x, y, line);
1384 /* bxmax/bxmin are inside the image, hence this won't overflow */
1385 i_fcolor *line = mymalloc(sizeof(i_fcolor) * (bxmax - bxmin)); /* checked 5jul05 tonyc */
1386 i_fcolor *work = NULL;
1388 work = mymalloc(sizeof(i_fcolor) * (bxmax - bxmin)); /* checked 5jul05 tonyc */
1390 for(y=bymin;y<=bymax;y++) {
1393 while (x < bxmax && !btm_test(btm, x, y)) {
1396 if (btm_test(btm, x, y)) {
1398 while (x < bxmax && btm_test(btm, x, y)) {
1401 if (fill->combinef) {
1402 i_glinf(im, start, x, y, line);
1403 (fill->fill_with_fcolor)(fill, start, y, x-start, im->channels,
1405 (fill->combinef)(line, work, im->channels, x-start);
1408 (fill->fill_with_fcolor)(fill, start, y, x-start, im->channels,
1411 i_plinf(im, start, x, y, line);