avoid a possible sign-extension for offsets/sizes in SGI
[imager.git] / draw.c
CommitLineData
af22c916 1#define IMAGER_NO_CONTEXT
92bda632 2#include "imager.h"
02d1d628
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3#include "draw.h"
4#include "log.h"
92bda632 5#include "imageri.h"
9b1ec2b8 6#include "imrender.h"
6af18d2b 7#include <limits.h>
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8#define NDEBUG
9#include <assert.h>
6af18d2b 10
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11int
12i_ppix_norm(i_img *im, i_img_dim x, i_img_dim y, i_color const *col) {
13 i_color src;
14 i_color work;
15 int dest_alpha;
16 int remains;
17
18 if (!col->channel[3])
19 return 0;
20
21 switch (im->channels) {
22 case 1:
23 work = *col;
24 i_adapt_colors(2, 4, &work, 1);
25 i_gpix(im, x, y, &src);
26 remains = 255 - work.channel[1];
27 src.channel[0] = (src.channel[0] * remains
28 + work.channel[0] * work.channel[1]) / 255;
29 return i_ppix(im, x, y, &src);
30
31 case 2:
32 work = *col;
33 i_adapt_colors(2, 4, &work, 1);
34 i_gpix(im, x, y, &src);
8d14daab 35 remains = 255 - work.channel[1];
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36 dest_alpha = work.channel[1] + remains * src.channel[1] / 255;
37 if (work.channel[1] == 255) {
38 return i_ppix(im, x, y, &work);
39 }
40 else {
41 src.channel[0] = (work.channel[1] * work.channel[0]
42 + remains * src.channel[0] * src.channel[1] / 255) / dest_alpha;
43 src.channel[1] = dest_alpha;
44 return i_ppix(im, x, y, &src);
45 }
46
47 case 3:
48 work = *col;
49 i_gpix(im, x, y, &src);
50 remains = 255 - work.channel[3];
51 src.channel[0] = (src.channel[0] * remains
52 + work.channel[0] * work.channel[3]) / 255;
53 src.channel[1] = (src.channel[1] * remains
54 + work.channel[1] * work.channel[3]) / 255;
55 src.channel[2] = (src.channel[2] * remains
56 + work.channel[2] * work.channel[3]) / 255;
57 return i_ppix(im, x, y, &src);
58
59 case 4:
60 work = *col;
61 i_gpix(im, x, y, &src);
8d14daab 62 remains = 255 - work.channel[3];
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63 dest_alpha = work.channel[3] + remains * src.channel[3] / 255;
64 if (work.channel[3] == 255) {
65 return i_ppix(im, x, y, &work);
66 }
67 else {
68 src.channel[0] = (work.channel[3] * work.channel[0]
69 + remains * src.channel[0] * src.channel[3] / 255) / dest_alpha;
70 src.channel[1] = (work.channel[3] * work.channel[1]
71 + remains * src.channel[1] * src.channel[3] / 255) / dest_alpha;
72 src.channel[2] = (work.channel[3] * work.channel[2]
73 + remains * src.channel[2] * src.channel[3] / 255) / dest_alpha;
74 src.channel[3] = dest_alpha;
75 return i_ppix(im, x, y, &src);
76 }
77 }
78 return 0;
79}
80
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81static void
82cfill_from_btm(i_img *im, i_fill_t *fill, struct i_bitmap *btm,
8d14daab 83 i_img_dim bxmin, i_img_dim bxmax, i_img_dim bymin, i_img_dim bymax);
3efb0915 84
02d1d628 85void
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86i_mmarray_cr(i_mmarray *ar,i_img_dim l) {
87 i_img_dim i;
88 size_t alloc_size;
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89
90 ar->lines=l;
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91 alloc_size = sizeof(minmax) * l;
92 /* check for overflow */
93 if (alloc_size / l != sizeof(minmax)) {
94 fprintf(stderr, "overflow calculating memory allocation");
95 exit(3);
96 }
97 ar->data=mymalloc(alloc_size); /* checked 5jul05 tonyc */
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98 for(i=0;i<l;i++) {
99 ar->data[i].max = -1;
100 ar->data[i].min = i_img_dim_MAX;
101 }
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102}
103
104void
105i_mmarray_dst(i_mmarray *ar) {
106 ar->lines=0;
107 if (ar->data != NULL) { myfree(ar->data); ar->data=NULL; }
108}
109
110void
8d14daab 111i_mmarray_add(i_mmarray *ar,i_img_dim x,i_img_dim y) {
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112 if (y>-1 && y<ar->lines)
113 {
114 if (x<ar->data[y].min) ar->data[y].min=x;
115 if (x>ar->data[y].max) ar->data[y].max=x;
116 }
117}
118
498a7bc2 119i_img_dim
8d14daab 120i_mmarray_gmin(i_mmarray *ar,i_img_dim y) {
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121 if (y>-1 && y<ar->lines) return ar->data[y].min;
122 else return -1;
123}
124
498a7bc2 125i_img_dim
8d14daab 126i_mmarray_getm(i_mmarray *ar,i_img_dim y) {
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127 if (y>-1 && y<ar->lines)
128 return ar->data[y].max;
129 else
130 return i_img_dim_MAX;
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131}
132
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133#if 0
134/* unused? */
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135void
136i_mmarray_render(i_img *im,i_mmarray *ar,i_color *val) {
8d14daab 137 i_img_dim i,x;
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138 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);
139}
8d14daab 140#endif
02d1d628 141
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142static
143void
8d14daab 144i_arcdraw(i_img_dim x1, i_img_dim y1, i_img_dim x2, i_img_dim y2, i_mmarray *ar) {
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145 double alpha;
146 double dsec;
8d14daab 147 i_img_dim temp;
02d1d628 148 alpha=(double)(y2-y1)/(double)(x2-x1);
b254292b 149 if (fabs(alpha) <= 1)
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150 {
151 if (x2<x1) { temp=x1; x1=x2; x2=temp; temp=y1; y1=y2; y2=temp; }
152 dsec=y1;
b254292b 153 while(x1<=x2)
02d1d628 154 {
8d14daab 155 i_mmarray_add(ar,x1,(i_img_dim)(dsec+0.5));
b254292b 156 dsec+=alpha;
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157 x1++;
158 }
159 }
160 else
161 {
162 alpha=1/alpha;
163 if (y2<y1) { temp=x1; x1=x2; x2=temp; temp=y1; y1=y2; y2=temp; }
164 dsec=x1;
b254292b 165 while(y1<=y2)
02d1d628 166 {
8d14daab 167 i_mmarray_add(ar,(i_img_dim)(dsec+0.5),y1);
b254292b 168 dsec+=alpha;
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169 y1++;
170 }
171 }
172}
173
174void
175i_mmarray_info(i_mmarray *ar) {
8d14daab 176 i_img_dim i;
02d1d628 177 for(i=0;i<ar->lines;i++)
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178 if (ar->data[i].max!=-1)
179 printf("line %"i_DF ": min=%" i_DF ", max=%" i_DF ".\n",
180 i_DFc(i), i_DFc(ar->data[i].min), i_DFc(ar->data[i].max));
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181}
182
a8652edf 183static void
8d14daab 184i_arc_minmax(i_int_hlines *hlines,i_img_dim x,i_img_dim y, double rad,float d1,float d2) {
02d1d628 185 i_mmarray dot;
98747309 186 double f;
8d14daab 187 i_img_dim x1,y1;
02d1d628 188
a8652edf 189 i_mmarray_cr(&dot, hlines->limit_y);
02d1d628 190
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191 x1=(i_img_dim)(x+0.5+rad*cos(d1*PI/180.0));
192 y1=(i_img_dim)(y+0.5+rad*sin(d1*PI/180.0));
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193
194 /* printf("x1: %d.\ny1: %d.\n",x1,y1); */
195 i_arcdraw(x, y, x1, y1, &dot);
196
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197 x1=(i_img_dim)(x+0.5+rad*cos(d2*PI/180.0));
198 y1=(i_img_dim)(y+0.5+rad*sin(d2*PI/180.0));
02d1d628 199
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200 for(f=d1;f<=d2;f+=0.01)
201 i_mmarray_add(&dot,(i_img_dim)(x+0.5+rad*cos(f*PI/180.0)),(i_img_dim)(y+0.5+rad*sin(f*PI/180.0)));
6af18d2b 202
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203 /* printf("x1: %d.\ny1: %d.\n",x1,y1); */
204 i_arcdraw(x, y, x1, y1, &dot);
205
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206 /* render the minmax values onto the hlines */
207 for (y = 0; y < dot.lines; y++) {
208 if (dot.data[y].max!=-1) {
8d14daab 209 i_img_dim minx, width;
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210 minx = dot.data[y].min;
211 width = dot.data[y].max - dot.data[y].min + 1;
212 i_int_hlines_add(hlines, y, minx, width);
213 }
214 }
215
02d1d628 216 /* dot.info(); */
7f882a01 217 i_mmarray_dst(&dot);
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218}
219
a8652edf 220static void
8d14daab 221i_arc_hlines(i_int_hlines *hlines,i_img_dim x,i_img_dim y,double rad,float d1,float d2) {
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222 if (d1 <= d2) {
223 i_arc_minmax(hlines, x, y, rad, d1, d2);
224 }
225 else {
226 i_arc_minmax(hlines, x, y, rad, d1, 360);
227 i_arc_minmax(hlines, x, y, rad, 0, d2);
228 }
229}
230
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231/*
232=item i_arc(im, x, y, rad, d1, d2, color)
233
234=category Drawing
235=synopsis i_arc(im, 50, 50, 20, 45, 135, &color);
236
237Fills an arc centered at (x,y) with radius I<rad> covering the range
238of angles in degrees from d1 to d2, with the color.
239
240=cut
241*/
242
a8652edf 243void
8d14daab 244i_arc(i_img *im, i_img_dim x, i_img_dim y,double rad,double d1,double d2,const i_color *val) {
a8652edf 245 i_int_hlines hlines;
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TC
246 dIMCTXim(im);
247
248 im_log((aIMCTX,1,"i_arc(im %p,(x,y)=(" i_DFp "), rad %f, d1 %f, d2 %f, col %p)",
249 im, i_DFcp(x, y), rad, d1, d2, val));
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250
251 i_int_init_hlines_img(&hlines, im);
252
253 i_arc_hlines(&hlines, x, y, rad, d1, d2);
254
255 i_int_hlines_fill_color(im, &hlines, val);
256
257 i_int_hlines_destroy(&hlines);
258}
259
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260/*
261=item i_arc_cfill(im, x, y, rad, d1, d2, fill)
262
263=category Drawing
264=synopsis i_arc_cfill(im, 50, 50, 35, 90, 135, fill);
265
266Fills an arc centered at (x,y) with radius I<rad> covering the range
267of angles in degrees from d1 to d2, with the fill object.
268
269=cut
270*/
271
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272#define MIN_CIRCLE_STEPS 8
273#define MAX_CIRCLE_STEPS 360
274
f1ac5027 275void
8d14daab 276i_arc_cfill(i_img *im, i_img_dim x, i_img_dim y,double rad,double d1,double d2,i_fill_t *fill) {
a8652edf 277 i_int_hlines hlines;
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278 dIMCTXim(im);
279
280 im_log((aIMCTX,1,"i_arc_cfill(im %p,(x,y)=(" i_DFp "), rad %f, d1 %f, d2 %f, fill %p)",
281 im, i_DFcp(x, y), rad, d1, d2, fill));
f1ac5027 282
a8652edf 283 i_int_init_hlines_img(&hlines, im);
f1ac5027 284
a8652edf 285 i_arc_hlines(&hlines, x, y, rad, d1, d2);
f1ac5027 286
a8652edf 287 i_int_hlines_fill_fill(im, &hlines, fill);
f1ac5027 288
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289 i_int_hlines_destroy(&hlines);
290}
f1ac5027 291
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292static void
293arc_poly(int *count, double **xvals, double **yvals,
294 double x, double y, double rad, double d1, double d2) {
295 double d1_rad, d2_rad;
296 double circum;
8d14daab 297 i_img_dim steps, point_count;
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298 double angle_inc;
299
300 /* normalize the angles */
301 d1 = fmod(d1, 360);
302 if (d1 == 0) {
303 if (d2 >= 360) { /* default is 361 */
304 d2 = 360;
305 }
306 else {
307 d2 = fmod(d2, 360);
308 if (d2 < d1)
309 d2 += 360;
310 }
311 }
312 else {
313 d2 = fmod(d2, 360);
314 if (d2 < d1)
315 d2 += 360;
316 }
317 d1_rad = d1 * PI / 180;
318 d2_rad = d2 * PI / 180;
319
320 /* how many segments for the curved part?
321 we do a maximum of one per degree, with a minimum of 8/circle
322 we try to aim at having about one segment per 2 pixels
323 Work it out per circle to get a step size.
324
325 I was originally making steps = circum/2 but that looked horrible.
326
327 I think there might be an issue in the polygon filler.
328 */
329 circum = 2 * PI * rad;
330 steps = circum;
331 if (steps > MAX_CIRCLE_STEPS)
332 steps = MAX_CIRCLE_STEPS;
333 else if (steps < MIN_CIRCLE_STEPS)
334 steps = MIN_CIRCLE_STEPS;
335
336 angle_inc = 2 * PI / steps;
337
338 point_count = steps + 5; /* rough */
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339 /* point_count is always relatively small, so allocation won't overflow */
340 *xvals = mymalloc(point_count * sizeof(double)); /* checked 17feb2005 tonyc */
341 *yvals = mymalloc(point_count * sizeof(double)); /* checked 17feb2005 tonyc */
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342
343 /* from centre to edge at d1 */
344 (*xvals)[0] = x;
345 (*yvals)[0] = y;
346 (*xvals)[1] = x + rad * cos(d1_rad);
347 (*yvals)[1] = y + rad * sin(d1_rad);
348 *count = 2;
349
350 /* step around the curve */
351 while (d1_rad < d2_rad) {
352 (*xvals)[*count] = x + rad * cos(d1_rad);
353 (*yvals)[*count] = y + rad * sin(d1_rad);
354 ++*count;
355 d1_rad += angle_inc;
356 }
f1ac5027 357
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358 /* finish off the curve */
359 (*xvals)[*count] = x + rad * cos(d2_rad);
360 (*yvals)[*count] = y + rad * sin(d2_rad);
361 ++*count;
362}
f1ac5027 363
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364/*
365=item i_arc_aa(im, x, y, rad, d1, d2, color)
366
367=category Drawing
368=synopsis i_arc_aa(im, 50, 50, 35, 90, 135, &color);
369
5715f7c3 370Anti-alias fills an arc centered at (x,y) with radius I<rad> covering
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TC
371the range of angles in degrees from d1 to d2, with the color.
372
373=cut
374*/
375
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376void
377i_arc_aa(i_img *im, double x, double y, double rad, double d1, double d2,
97ac0a96 378 const i_color *val) {
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379 double *xvals, *yvals;
380 int count;
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381 dIMCTXim(im);
382
383 im_log((aIMCTX,1,"i_arc_aa(im %p,(x,y)=(%f,%f), rad %f, d1 %f, d2 %f, col %p)",
384 im, x, y, rad, d1, d2, val));
a8652edf 385
6b8fe08b 386 arc_poly(&count, &xvals, &yvals, x, y, rad, d1, d2);
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387
388 i_poly_aa(im, count, xvals, yvals, val);
389
390 myfree(xvals);
391 myfree(yvals);
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392}
393
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394/*
395=item i_arc_aa_cfill(im, x, y, rad, d1, d2, fill)
396
397=category Drawing
398=synopsis i_arc_aa_cfill(im, 50, 50, 35, 90, 135, fill);
399
5715f7c3 400Anti-alias fills an arc centered at (x,y) with radius I<rad> covering
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401the range of angles in degrees from d1 to d2, with the fill object.
402
403=cut
404*/
405
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406void
407i_arc_aa_cfill(i_img *im, double x, double y, double rad, double d1, double d2,
408 i_fill_t *fill) {
409 double *xvals, *yvals;
410 int count;
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411 dIMCTXim(im);
412
413 im_log((aIMCTX,1,"i_arc_aa_cfill(im %p,(x,y)=(%f,%f), rad %f, d1 %f, d2 %f, fill %p)",
414 im, x, y, rad, d1, d2, fill));
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415
416 arc_poly(&count, &xvals, &yvals, x, y, rad, d1, d2);
417
418 i_poly_aa_cfill(im, count, xvals, yvals, fill);
6af18d2b 419
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420 myfree(xvals);
421 myfree(yvals);
422}
6af18d2b 423
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424typedef i_img_dim frac;
425static frac float_to_frac(double x) { return (frac)(0.5+x*16.0); }
6af18d2b 426
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427typedef void
428(*flush_render_t)(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_sample_t *cover, void *ctx);
429
430static void
431i_circle_aa_low(i_img *im, double x, double y, double rad, flush_render_t r, void *ctx);
432
433static void
434scanline_flush_color(i_img *im, i_img_dim l, i_img_dim y, i_img_dim width, const i_sample_t *cover, void *ctx);
435
436static void
437scanline_flush_fill(i_img *im, i_img_dim l, i_img_dim y, i_img_dim width, const i_sample_t *cover, void *ctx);
438
439typedef struct {
440 i_render r;
441 i_color c;
442} flush_color_t;
443
444typedef struct {
445 i_render r;
446 i_fill_t *fill;
447} flush_fill_t;
448
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449/*
450=item i_circle_aa(im, x, y, rad, color)
451
452=category Drawing
453=synopsis i_circle_aa(im, 50, 50, 45, &color);
454
5715f7c3 455Anti-alias fills a circle centered at (x,y) for radius I<rad> with
92bda632
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456color.
457
458=cut
459*/
bf18ef3a 460
6af18d2b 461void
8d14daab 462i_circle_aa(i_img *im, double x, double y, double rad, const i_color *val) {
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TC
463 flush_color_t fc;
464
465 fc.c = *val;
466 i_render_init(&fc.r, im, rad * 2 + 1);
467
468 i_circle_aa_low(im, x, y, rad, scanline_flush_color, &fc);
469
470 i_render_done(&fc.r);
471}
472
473/*
474=item i_circle_aa_fill(im, x, y, rad, fill)
475
476=category Drawing
477=synopsis i_circle_aa_fill(im, 50, 50, 45, fill);
478
479Anti-alias fills a circle centered at (x,y) for radius I<rad> with
480fill.
481
482=cut
483*/
484
485void
486i_circle_aa_fill(i_img *im, double x, double y, double rad, i_fill_t *fill) {
487 flush_fill_t ff;
488
489 ff.fill = fill;
490 i_render_init(&ff.r, im, rad * 2 + 1);
491
492 i_circle_aa_low(im, x, y, rad, scanline_flush_fill, &ff);
493
494 i_render_done(&ff.r);
495}
496
497static void
498i_circle_aa_low(i_img *im, double x, double y, double rad, flush_render_t r,
499 void *ctx) {
6af18d2b 500 i_color temp;
8d14daab 501 i_img_dim ly;
af22c916 502 dIMCTXim(im);
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503 double ceil_rad = ceil(rad);
504 i_img_dim first_row = floor(y) - ceil_rad;
505 i_img_dim last_row = ceil(y) + ceil_rad;
506 i_img_dim first_col = floor(x) - ceil_rad;
507 i_img_dim last_col = ceil(x) + ceil_rad;
1bc6916b 508 double r_sqr = rad * rad;
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509 i_img_dim max_width = 2 * ceil(rad) + 1;
510 unsigned char *coverage = NULL;
511 size_t coverage_size;
1bc6916b 512 int sub;
6af18d2b 513
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514 im_log((aIMCTX, 1, "i_circle_aa_low(im %p, centre(" i_DFp "), rad %.2f, r %p, ctx %p)\n",
515 im, i_DFcp(x, y), rad, r, ctx));
6af18d2b 516
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TC
517 if (first_row < 0)
518 first_row = 0;
519 if (last_row > im->ysize-1)
520 last_row = im->ysize - 1;
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521 if (first_col < 0)
522 first_col = 0;
523 if (last_col > im->xsize-1)
524 last_col = im->xsize - 1;
6af18d2b 525
1456b645 526 if (rad <= 0 || last_row < first_row || last_col < first_col) {
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527 /* outside the image */
528 return;
529 }
6af18d2b 530
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531 coverage_size = max_width;
532 coverage = mymalloc(coverage_size);
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533
534 for(ly = first_row; ly < last_row; ly++) {
535 frac min_frac_x[16];
536 frac max_frac_x[16];
1456b645 537 i_img_dim min_frac_left_x = 16 *(ceil(x) + ceil(rad));
1bc6916b 538 i_img_dim max_frac_left_x = -1;
1456b645 539 i_img_dim min_frac_right_x = 16 * (floor(x) - ceil(rad));
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TC
540 i_img_dim max_frac_right_x = -1;
541 /* reset work_y each row so the error doesn't build up */
542 double work_y = ly;
543 double dy, dy_sqr;
544
545 for (sub = 0; sub < 16; ++sub) {
546 work_y += 1.0 / 16.0;
547 dy = work_y - y;
548 dy_sqr = dy * dy;
549
550 if (dy_sqr < r_sqr) {
551 double dx = sqrt(r_sqr - dy_sqr);
552 double left_x = x - dx;
553 double right_x = x + dx;
554 frac frac_left_x = float_to_frac(left_x);
555 frac frac_right_x = float_to_frac(right_x);
556
557 if (frac_left_x < min_frac_left_x)
558 min_frac_left_x = frac_left_x;
559 if (frac_left_x > max_frac_left_x)
560 max_frac_left_x = frac_left_x;
561 if (frac_right_x < min_frac_right_x)
562 min_frac_right_x = frac_right_x;
563 if (frac_right_x > max_frac_right_x)
564 max_frac_right_x = frac_right_x;
565 min_frac_x[sub] = frac_left_x;
566 max_frac_x[sub] = frac_right_x;
567 }
568 else {
569 min_frac_x[sub] = max_frac_x[sub] = 0;
570 max_frac_left_x = im->xsize * 16;
571 min_frac_right_x = -1;
572 }
6af18d2b
AMH
573 }
574
1bc6916b
TC
575 if (min_frac_left_x != -1) {
576 /* something to draw on this line */
577 i_img_dim min_x = (min_frac_left_x / 16);
578 i_img_dim max_x = (max_frac_right_x + 15) / 16;
579 i_img_dim left_solid = (max_frac_left_x + 15) / 16;
580 i_img_dim right_solid = min_frac_right_x / 16;
581 i_img_dim work_x;
582 i_img_dim frac_work_x;
bf18ef3a 583 i_sample_t *cout = coverage;
1bc6916b
TC
584
585 for (work_x = min_x, frac_work_x = min_x * 16;
586 work_x <= max_x;
587 ++work_x, frac_work_x += 16) {
588 if (work_x <= left_solid || work_x >= right_solid) {
bf18ef3a 589 int pix_coverage = 0;
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TC
590 int ch;
591 double ratio;
592 i_img_dim frac_work_right = frac_work_x + 16;
593 for (sub = 0; sub < 16; ++sub) {
594 frac pix_left = min_frac_x[sub];
595 frac pix_right = max_frac_x[sub];
596 if (pix_left < pix_right
597 && pix_left < frac_work_right
598 && pix_right >= frac_work_x) {
599 if (pix_left < frac_work_x)
600 pix_left = frac_work_x;
601 if (pix_right > frac_work_right)
602 pix_right = frac_work_right;
bf18ef3a 603 pix_coverage += pix_right - pix_left;
1bc6916b
TC
604 }
605 }
606
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TC
607 assert(pix_coverage <= 256);
608 *cout++ = pix_coverage * 255 / 256;
1bc6916b
TC
609 }
610 else {
611 /* full coverage */
bf18ef3a 612 *cout++ = 255;
1bc6916b 613 }
6af18d2b 614 }
bf18ef3a 615 r(im, min_x, ly, max_x - min_x + 1, coverage, ctx);
6af18d2b
AMH
616 }
617 }
bf18ef3a
TC
618
619 myfree(coverage);
620}
621
622static void
623scanline_flush_color(i_img *im, i_img_dim x, i_img_dim y, i_img_dim width, const unsigned char *cover, void *ctx) {
624 flush_color_t *fc = ctx;
625
626 i_render_color(&fc->r, x, y, width, cover, &fc->c);
6af18d2b
AMH
627}
628
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TC
629static void
630scanline_flush_fill(i_img *im, i_img_dim x, i_img_dim y, i_img_dim width, const unsigned char *cover, void *ctx) {
631 flush_fill_t *ff = ctx;
632
633 i_render_fill(&ff->r, x, y, width, cover, ff->fill);
634}
635
636
40068b33
TC
637/*
638=item i_circle_out(im, x, y, r, col)
639
640=category Drawing
641=synopsis i_circle_out(im, 50, 50, 45, &color);
642
643Draw a circle outline centered at (x,y) with radius r,
644non-anti-aliased.
645
646Parameters:
647
648=over
649
650=item *
651
652(x, y) - the center of the circle
653
654=item *
655
656r - the radius of the circle in pixels, must be non-negative
657
658=back
659
660Returns non-zero on success.
661
662Implementation:
663
664=cut
665*/
666
667int
668i_circle_out(i_img *im, i_img_dim xc, i_img_dim yc, i_img_dim r,
669 const i_color *col) {
670 i_img_dim x, y;
671 i_img_dim dx, dy;
672 int error;
af22c916 673 dIMCTXim(im);
40068b33 674
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TC
675 im_log((aIMCTX, 1, "i_circle_out(im %p, centre(" i_DFp "), rad %" i_DF ", col %p)\n",
676 im, i_DFcp(xc, yc), i_DFc(r), col));
677
af22c916 678 im_clear_error(aIMCTX);
40068b33
TC
679
680 if (r < 0) {
af22c916 681 im_push_error(aIMCTX, 0, "circle: radius must be non-negative");
40068b33
TC
682 return 0;
683 }
684
685 i_ppix(im, xc+r, yc, col);
686 i_ppix(im, xc-r, yc, col);
687 i_ppix(im, xc, yc+r, col);
688 i_ppix(im, xc, yc-r, col);
689
690 x = 0;
691 y = r;
692 dx = 1;
693 dy = -2 * r;
694 error = 1 - r;
695 while (x < y) {
696 if (error >= 0) {
697 --y;
698 dy += 2;
699 error += dy;
700 }
701 ++x;
702 dx += 2;
703 error += dx;
704
705 i_ppix(im, xc + x, yc + y, col);
706 i_ppix(im, xc + x, yc - y, col);
707 i_ppix(im, xc - x, yc + y, col);
708 i_ppix(im, xc - x, yc - y, col);
709 if (x != y) {
710 i_ppix(im, xc + y, yc + x, col);
711 i_ppix(im, xc + y, yc - x, col);
712 i_ppix(im, xc - y, yc + x, col);
713 i_ppix(im, xc - y, yc - x, col);
714 }
715 }
716
717 return 1;
718}
719
720/*
721=item arc_seg(angle)
722
723Convert an angle in degrees into an angle measure we can generate
724simply from the numbers we have when drawing the circle.
725
12db268a 726=cut
40068b33
TC
727*/
728
729static i_img_dim
730arc_seg(double angle, int scale) {
731 i_img_dim seg = (angle + 45) / 90;
732 double remains = angle - seg * 90; /* should be in the range [-45,45] */
40068b33
TC
733
734 while (seg > 4)
735 seg -= 4;
736 if (seg == 4 && remains > 0)
737 seg = 0;
738
739 return scale * (seg * 2 + sin(remains * PI/180));
740}
741
742/*
743=item i_arc_out(im, x, y, r, d1, d2, col)
744
745=category Drawing
746=synopsis i_arc_out(im, 50, 50, 45, 45, 135, &color);
747
748Draw an arc outline centered at (x,y) with radius r, non-anti-aliased
749over the angle range d1 through d2 degrees.
750
751Parameters:
752
753=over
754
755=item *
756
757(x, y) - the center of the circle
758
759=item *
760
761r - the radius of the circle in pixels, must be non-negative
762
763=item *
764
765d1, d2 - the range of angles to draw the arc over, in degrees.
766
767=back
768
769Returns non-zero on success.
770
771Implementation:
772
773=cut
774*/
775
776int
777i_arc_out(i_img *im, i_img_dim xc, i_img_dim yc, i_img_dim r,
8d14daab 778 double d1, double d2, const i_color *col) {
40068b33
TC
779 i_img_dim x, y;
780 i_img_dim dx, dy;
781 int error;
782 i_img_dim segs[2][2];
783 int seg_count;
784 i_img_dim sin_th;
785 i_img_dim seg_d1, seg_d2;
786 int seg_num;
40068b33
TC
787 i_img_dim scale = r + 1;
788 i_img_dim seg1 = scale * 2;
789 i_img_dim seg2 = scale * 4;
790 i_img_dim seg3 = scale * 6;
791 i_img_dim seg4 = scale * 8;
857e686a
TC
792 dIMCTXim(im);
793
794 im_log((aIMCTX,1,"i_arc_out(im %p,centre(" i_DFp "), rad %" i_DF ", d1 %f, d2 %f, col %p)",
795 im, i_DFcp(xc, yc), i_DFc(r), d1, d2, col));
40068b33 796
af22c916 797 im_clear_error(aIMCTX);
40068b33
TC
798
799 if (r <= 0) {
af22c916 800 im_push_error(aIMCTX, 0, "arc: radius must be non-negative");
40068b33
TC
801 return 0;
802 }
803 if (d1 + 360 <= d2)
804 return i_circle_out(im, xc, yc, r, col);
805
806 if (d1 < 0)
807 d1 += 360 * floor((-d1 + 359) / 360);
808 if (d2 < 0)
809 d2 += 360 * floor((-d2 + 359) / 360);
810 d1 = fmod(d1, 360);
811 d2 = fmod(d2, 360);
812 seg_d1 = arc_seg(d1, scale);
813 seg_d2 = arc_seg(d2, scale);
814 if (seg_d2 < seg_d1) {
815 /* split into two segments */
816 segs[0][0] = 0;
817 segs[0][1] = seg_d2;
818 segs[1][0] = seg_d1;
819 segs[1][1] = seg4;
820 seg_count = 2;
821 }
822 else {
823 segs[0][0] = seg_d1;
824 segs[0][1] = seg_d2;
825 seg_count = 1;
826 }
827
828 for (seg_num = 0; seg_num < seg_count; ++seg_num) {
829 i_img_dim seg_start = segs[seg_num][0];
830 i_img_dim seg_end = segs[seg_num][1];
831 if (seg_start == 0)
832 i_ppix(im, xc+r, yc, col);
833 if (seg_start <= seg1 && seg_end >= seg1)
834 i_ppix(im, xc, yc+r, col);
835 if (seg_start <= seg2 && seg_end >= seg2)
836 i_ppix(im, xc-r, yc, col);
837 if (seg_start <= seg3 && seg_end >= seg3)
838 i_ppix(im, xc, yc-r, col);
839
840 y = 0;
841 x = r;
842 dy = 1;
843 dx = -2 * r;
844 error = 1 - r;
845 while (y < x) {
846 if (error >= 0) {
847 --x;
848 dx += 2;
849 error += dx;
850 }
851 ++y;
852 dy += 2;
853 error += dy;
854
855 sin_th = y;
856 if (seg_start <= sin_th && seg_end >= sin_th)
857 i_ppix(im, xc + x, yc + y, col);
858 if (seg_start <= seg1 - sin_th && seg_end >= seg1 - sin_th)
859 i_ppix(im, xc + y, yc + x, col);
860
861 if (seg_start <= seg1 + sin_th && seg_end >= seg1 + sin_th)
862 i_ppix(im, xc - y, yc + x, col);
863 if (seg_start <= seg2 - sin_th && seg_end >= seg2 - sin_th)
864 i_ppix(im, xc - x, yc + y, col);
865
866 if (seg_start <= seg2 + sin_th && seg_end >= seg2 + sin_th)
867 i_ppix(im, xc - x, yc - y, col);
868 if (seg_start <= seg3 - sin_th && seg_end >= seg3 - sin_th)
869 i_ppix(im, xc - y, yc - x, col);
870
871 if (seg_start <= seg3 + sin_th && seg_end >= seg3 + sin_th)
872 i_ppix(im, xc + y, yc - x, col);
873 if (seg_start <= seg4 - sin_th && seg_end >= seg4 - sin_th)
874 i_ppix(im, xc + x, yc - y, col);
875 }
876 }
877
878 return 1;
879}
880
881static double
882cover(i_img_dim r, i_img_dim j) {
8d14daab 883 double rjsqrt = sqrt(r*r - j*j);
40068b33
TC
884
885 return ceil(rjsqrt) - rjsqrt;
886}
887
888/*
889=item i_circle_out_aa(im, xc, yc, r, col)
890
891=synopsis i_circle_out_aa(im, 50, 50, 45, &color);
892
893Draw a circle outline centered at (x,y) with radius r, anti-aliased.
894
895Parameters:
896
897=over
898
899=item *
900
901(xc, yc) - the center of the circle
902
903=item *
904
905r - the radius of the circle in pixels, must be non-negative
906
907=item *
908
909col - an i_color for the color to draw in.
910
911=back
912
913Returns non-zero on success.
914
915=cut
916
917Based on "Fast Anti-Aliased Circle Generation", Xiaolin Wu, Graphics
918Gems.
919
920I use floating point for I<D> since for large circles the precision of
921a [0,255] value isn't sufficient when approaching the end of the
922octant.
923
924*/
925
926int
927i_circle_out_aa(i_img *im, i_img_dim xc, i_img_dim yc, i_img_dim r, const i_color *col) {
928 i_img_dim i, j;
929 double t;
930 i_color workc = *col;
931 int orig_alpha = col->channel[3];
af22c916 932 dIMCTXim(im);
dc95a369 933
857e686a
TC
934 im_log((aIMCTX,1,"i_circle_out_aa(im %p,centre(" i_DFp "), rad %" i_DF ", col %p)",
935 im, i_DFcp(xc, yc), i_DFc(r), col));
936
af22c916 937 im_clear_error(aIMCTX);
40068b33 938 if (r <= 0) {
af22c916 939 im_push_error(aIMCTX, 0, "arc: radius must be non-negative");
40068b33
TC
940 return 0;
941 }
942 i = r;
943 j = 0;
944 t = 0;
945 i_ppix_norm(im, xc+i, yc+j, col);
946 i_ppix_norm(im, xc-i, yc+j, col);
947 i_ppix_norm(im, xc+j, yc+i, col);
948 i_ppix_norm(im, xc+j, yc-i, col);
949
950 while (i > j+1) {
951 double d;
952 int cv, inv_cv;
40068b33
TC
953 j++;
954 d = cover(r, j);
955 cv = (int)(d * 255 + 0.5);
956 inv_cv = 255-cv;
957 if (d < t) {
958 --i;
959 }
960 if (inv_cv) {
961 workc.channel[3] = orig_alpha * inv_cv / 255;
962 i_ppix_norm(im, xc+i, yc+j, &workc);
963 i_ppix_norm(im, xc-i, yc+j, &workc);
964 i_ppix_norm(im, xc+i, yc-j, &workc);
965 i_ppix_norm(im, xc-i, yc-j, &workc);
966
967 if (i != j) {
968 i_ppix_norm(im, xc+j, yc+i, &workc);
969 i_ppix_norm(im, xc-j, yc+i, &workc);
970 i_ppix_norm(im, xc+j, yc-i, &workc);
971 i_ppix_norm(im, xc-j, yc-i, &workc);
972 }
973 }
974 if (cv && i > j) {
975 workc.channel[3] = orig_alpha * cv / 255;
976 i_ppix_norm(im, xc+i-1, yc+j, &workc);
977 i_ppix_norm(im, xc-i+1, yc+j, &workc);
978 i_ppix_norm(im, xc+i-1, yc-j, &workc);
979 i_ppix_norm(im, xc-i+1, yc-j, &workc);
980
981 if (j != i-1) {
982 i_ppix_norm(im, xc+j, yc+i-1, &workc);
983 i_ppix_norm(im, xc-j, yc+i-1, &workc);
984 i_ppix_norm(im, xc+j, yc-i+1, &workc);
985 i_ppix_norm(im, xc-j, yc-i+1, &workc);
986 }
987 }
988 t = d;
989 }
990
991 return 1;
992}
993
994/*
995=item i_arc_out_aa(im, xc, yc, r, d1, d2, col)
996
997=synopsis i_arc_out_aa(im, 50, 50, 45, 45, 125, &color);
998
999Draw a circle arc outline centered at (x,y) with radius r, from angle
1000d1 degrees through angle d2 degrees, anti-aliased.
1001
1002Parameters:
1003
1004=over
1005
1006=item *
1007
1008(xc, yc) - the center of the circle
1009
1010=item *
1011
1012r - the radius of the circle in pixels, must be non-negative
1013
1014=item *
1015
1016d1, d2 - the range of angle in degrees to draw the arc through. If
1017d2-d1 >= 360 a full circle is drawn.
1018
1019=back
1020
1021Returns non-zero on success.
1022
1023=cut
1024
1025Based on "Fast Anti-Aliased Circle Generation", Xiaolin Wu, Graphics
1026Gems.
1027
1028*/
1029
1030int
8d14daab 1031i_arc_out_aa(i_img *im, i_img_dim xc, i_img_dim yc, i_img_dim r, double d1, double d2, const i_color *col) {
40068b33
TC
1032 i_img_dim i, j;
1033 double t;
1034 i_color workc = *col;
1035 i_img_dim segs[2][2];
1036 int seg_count;
1037 i_img_dim sin_th;
1038 i_img_dim seg_d1, seg_d2;
1039 int seg_num;
1040 int orig_alpha = col->channel[3];
1041 i_img_dim scale = r + 1;
1042 i_img_dim seg1 = scale * 2;
1043 i_img_dim seg2 = scale * 4;
1044 i_img_dim seg3 = scale * 6;
1045 i_img_dim seg4 = scale * 8;
af22c916 1046 dIMCTXim(im);
40068b33 1047
857e686a
TC
1048 im_log((aIMCTX,1,"i_arc_out_aa(im %p,centre(" i_DFp "), rad %" i_DF ", d1 %f, d2 %f, col %p)",
1049 im, i_DFcp(xc, yc), i_DFc(r), d1, d2, col));
1050
af22c916 1051 im_clear_error(aIMCTX);
40068b33 1052 if (r <= 0) {
af22c916 1053 im_push_error(aIMCTX, 0, "arc: radius must be non-negative");
40068b33
TC
1054 return 0;
1055 }
1056 if (d1 + 360 <= d2)
1057 return i_circle_out_aa(im, xc, yc, r, col);
1058
1059 if (d1 < 0)
1060 d1 += 360 * floor((-d1 + 359) / 360);
1061 if (d2 < 0)
1062 d2 += 360 * floor((-d2 + 359) / 360);
1063 d1 = fmod(d1, 360);
1064 d2 = fmod(d2, 360);
1065 seg_d1 = arc_seg(d1, scale);
1066 seg_d2 = arc_seg(d2, scale);
1067 if (seg_d2 < seg_d1) {
1068 /* split into two segments */
1069 segs[0][0] = 0;
1070 segs[0][1] = seg_d2;
1071 segs[1][0] = seg_d1;
1072 segs[1][1] = seg4;
1073 seg_count = 2;
1074 }
1075 else {
1076 segs[0][0] = seg_d1;
1077 segs[0][1] = seg_d2;
1078 seg_count = 1;
1079 }
1080
1081 for (seg_num = 0; seg_num < seg_count; ++seg_num) {
1082 i_img_dim seg_start = segs[seg_num][0];
1083 i_img_dim seg_end = segs[seg_num][1];
1084
1085 i = r;
1086 j = 0;
1087 t = 0;
1088
1089 if (seg_start == 0)
1090 i_ppix_norm(im, xc+i, yc+j, col);
1091 if (seg_start <= seg1 && seg_end >= seg1)
1092 i_ppix_norm(im, xc+j, yc+i, col);
1093 if (seg_start <= seg2 && seg_end >= seg2)
1094 i_ppix_norm(im, xc-i, yc+j, col);
1095 if (seg_start <= seg3 && seg_end >= seg3)
1096 i_ppix_norm(im, xc+j, yc-i, col);
1097
1098 while (i > j+1) {
1099 int cv, inv_cv;
40068b33
TC
1100 double d;
1101 j++;
1102 d = cover(r, j);
1103 cv = (int)(d * 255 + 0.5);
1104 inv_cv = 255-cv;
1105 if (d < t) {
1106 --i;
1107 }
1108 sin_th = j;
1109 if (inv_cv) {
1110 workc.channel[3] = orig_alpha * inv_cv / 255;
1111
1112 if (seg_start <= sin_th && seg_end >= sin_th)
1113 i_ppix_norm(im, xc+i, yc+j, &workc);
1114 if (seg_start <= seg2 - sin_th && seg_end >= seg2 - sin_th)
1115 i_ppix_norm(im, xc-i, yc+j, &workc);
1116 if (seg_start <= seg4 - sin_th && seg_end >= seg4 - sin_th)
1117 i_ppix_norm(im, xc+i, yc-j, &workc);
1118 if (seg_start <= seg2 + sin_th && seg_end >= seg2 + sin_th)
1119 i_ppix_norm(im, xc-i, yc-j, &workc);
1120
1121 if (i != j) {
1122 if (seg_start <= seg1 - sin_th && seg_end >= seg1 - sin_th)
1123 i_ppix_norm(im, xc+j, yc+i, &workc);
1124 if (seg_start <= seg1 + sin_th && seg_end >= seg1 + sin_th)
1125 i_ppix_norm(im, xc-j, yc+i, &workc);
1126 if (seg_start <= seg3 + sin_th && seg_end >= seg3 + sin_th)
1127 i_ppix_norm(im, xc+j, yc-i, &workc);
1128 if (seg_start <= seg3 - sin_th && seg_end >= seg3 - sin_th)
1129 i_ppix_norm(im, xc-j, yc-i, &workc);
1130 }
1131 }
1132 if (cv && i > j) {
1133 workc.channel[3] = orig_alpha * cv / 255;
1134 if (seg_start <= sin_th && seg_end >= sin_th)
1135 i_ppix_norm(im, xc+i-1, yc+j, &workc);
1136 if (seg_start <= seg2 - sin_th && seg_end >= seg2 - sin_th)
1137 i_ppix_norm(im, xc-i+1, yc+j, &workc);
1138 if (seg_start <= seg4 - sin_th && seg_end >= seg4 - sin_th)
1139 i_ppix_norm(im, xc+i-1, yc-j, &workc);
1140 if (seg_start <= seg2 + sin_th && seg_end >= seg2 + sin_th)
1141 i_ppix_norm(im, xc-i+1, yc-j, &workc);
1142
1143 if (seg_start <= seg1 - sin_th && seg_end >= seg1 - sin_th)
1144 i_ppix_norm(im, xc+j, yc+i-1, &workc);
1145 if (seg_start <= seg1 + sin_th && seg_end >= seg1 + sin_th)
1146 i_ppix_norm(im, xc-j, yc+i-1, &workc);
1147 if (seg_start <= seg3 + sin_th && seg_end >= seg3 + sin_th)
1148 i_ppix_norm(im, xc+j, yc-i+1, &workc);
1149 if (seg_start <= seg3 - sin_th && seg_end >= seg3 - sin_th)
1150 i_ppix_norm(im, xc-j, yc-i+1, &workc);
1151 }
1152 t = d;
1153 }
1154 }
1155
1156 return 1;
1157}
1158
92bda632
TC
1159/*
1160=item i_box(im, x1, y1, x2, y2, color)
6af18d2b 1161
92bda632
TC
1162=category Drawing
1163=synopsis i_box(im, 0, 0, im->xsize-1, im->ysize-1, &color).
6af18d2b 1164
92bda632 1165Outlines the box from (x1,y1) to (x2,y2) inclusive with I<color>.
6af18d2b 1166
92bda632
TC
1167=cut
1168*/
6af18d2b 1169
02d1d628 1170void
8d14daab
TC
1171i_box(i_img *im,i_img_dim x1,i_img_dim y1,i_img_dim x2,i_img_dim y2,const i_color *val) {
1172 i_img_dim x,y;
857e686a
TC
1173 dIMCTXim(im);
1174
1175 im_log((aIMCTX, 1,"i_box(im* %p, p1(" i_DFp "), p2(" i_DFp "),val %p)\n",
8d14daab 1176 im, i_DFcp(x1,y1), i_DFcp(x2,y2), val));
02d1d628
AMH
1177 for(x=x1;x<x2+1;x++) {
1178 i_ppix(im,x,y1,val);
1179 i_ppix(im,x,y2,val);
1180 }
1181 for(y=y1;y<y2+1;y++) {
1182 i_ppix(im,x1,y,val);
1183 i_ppix(im,x2,y,val);
1184 }
1185}
1186
92bda632
TC
1187/*
1188=item i_box_filled(im, x1, y1, x2, y2, color)
1189
1190=category Drawing
1191=synopsis i_box_filled(im, 0, 0, im->xsize-1, im->ysize-1, &color);
1192
1193Fills the box from (x1,y1) to (x2,y2) inclusive with color.
1194
1195=cut
1196*/
1197
02d1d628 1198void
8d14daab 1199i_box_filled(i_img *im,i_img_dim x1,i_img_dim y1,i_img_dim x2,i_img_dim y2, const i_color *val) {
3b000586
TC
1200 i_img_dim x, y, width;
1201 i_palidx index;
857e686a 1202 dIMCTXim(im);
3b000586 1203
857e686a 1204 im_log((aIMCTX,1,"i_box_filled(im* %p, p1(" i_DFp "), p2(" i_DFp "),val %p)\n",
8d14daab 1205 im, i_DFcp(x1, y1), i_DFcp(x2,y2) ,val));
3b000586
TC
1206
1207 if (x1 > x2 || y1 > y2
1208 || x2 < 0 || y2 < 0
1209 || x1 >= im->xsize || y1 > im->ysize)
1210 return;
1211
1212 if (x1 < 0)
1213 x1 = 0;
1214 if (x2 >= im->xsize)
1215 x2 = im->xsize - 1;
1216 if (y1 < 0)
1217 y1 = 0;
1218 if (y2 >= im->ysize)
1219 y2 = im->ysize - 1;
1220
1221 width = x2 - x1 + 1;
1222
1223 if (im->type == i_palette_type
1224 && i_findcolor(im, val, &index)) {
1225 i_palidx *line = mymalloc(sizeof(i_palidx) * width);
1226
1227 for (x = 0; x < width; ++x)
1228 line[x] = index;
1229
1230 for (y = y1; y <= y2; ++y)
1231 i_ppal(im, x1, x2+1, y, line);
1232
1233 myfree(line);
1234 }
1235 else {
1236 i_color *line = mymalloc(sizeof(i_color) * width);
1237
1238 for (x = 0; x < width; ++x)
1239 line[x] = *val;
1240
1241 for (y = y1; y <= y2; ++y)
1242 i_plin(im, x1, x2+1, y, line);
1243
1244 myfree(line);
1245 }
02d1d628
AMH
1246}
1247
7477ff14
TC
1248/*
1249=item i_box_filledf(im, x1, y1, x2, y2, color)
1250
1251=category Drawing
1252=synopsis i_box_filledf(im, 0, 0, im->xsize-1, im->ysize-1, &fcolor);
1253
1254Fills the box from (x1,y1) to (x2,y2) inclusive with a floating point
1255color.
1256
1257=cut
1258*/
1259
1260int
8d14daab 1261i_box_filledf(i_img *im,i_img_dim x1,i_img_dim y1,i_img_dim x2,i_img_dim y2, const i_fcolor *val) {
7477ff14 1262 i_img_dim x, y, width;
857e686a 1263 dIMCTXim(im);
7477ff14 1264
857e686a 1265 im_log((aIMCTX, 1,"i_box_filledf(im* %p, p1(" i_DFp "), p2(" i_DFp "),val %p)\n",
8d14daab 1266 im, i_DFcp(x1, y1), i_DFcp(x2, y2), val));
7477ff14
TC
1267
1268 if (x1 > x2 || y1 > y2
1269 || x2 < 0 || y2 < 0
1270 || x1 >= im->xsize || y1 > im->ysize)
1271 return 0;
1272
1273 if (x1 < 0)
1274 x1 = 0;
1275 if (x2 >= im->xsize)
1276 x2 = im->xsize - 1;
1277 if (y1 < 0)
1278 y1 = 0;
1279 if (y2 >= im->ysize)
1280 y2 = im->ysize - 1;
1281
1282 width = x2 - x1 + 1;
1283
1284 if (im->bits <= 8) {
1285 i_color c;
1286 c.rgba.r = SampleFTo8(val->rgba.r);
1287 c.rgba.g = SampleFTo8(val->rgba.g);
1288 c.rgba.b = SampleFTo8(val->rgba.b);
1289 c.rgba.a = SampleFTo8(val->rgba.a);
1290
1291 i_box_filled(im, x1, y1, x2, y2, &c);
1292 }
1293 else {
1294 i_fcolor *line = mymalloc(sizeof(i_fcolor) * width);
1295
1296 for (x = 0; x < width; ++x)
1297 line[x] = *val;
1298
1299 for (y = y1; y <= y2; ++y)
1300 i_plinf(im, x1, x2+1, y, line);
1301
1302 myfree(line);
1303 }
1304
1305 return 1;
1306}
1307
92bda632
TC
1308/*
1309=item i_box_cfill(im, x1, y1, x2, y2, fill)
1310
1311=category Drawing
1312=synopsis i_box_cfill(im, 0, 0, im->xsize-1, im->ysize-1, fill);
1313
1314Fills the box from (x1,y1) to (x2,y2) inclusive with fill.
1315
1316=cut
1317*/
1318
f1ac5027 1319void
8d14daab 1320i_box_cfill(i_img *im,i_img_dim x1,i_img_dim y1,i_img_dim x2,i_img_dim y2,i_fill_t *fill) {
9b1ec2b8 1321 i_render r;
857e686a 1322 dIMCTXim(im);
8d14daab 1323
857e686a 1324 im_log((aIMCTX,1,"i_box_cfill(im* %p, p1(" i_DFp "), p2(" i_DFp "), fill %p)\n",
8d14daab 1325 im, i_DFcp(x1, y1), i_DFcp(x2,y2), fill));
f1ac5027
TC
1326
1327 ++x2;
f0960b14
TC
1328 if (x1 < 0)
1329 x1 = 0;
1330 if (y1 < 0)
1331 y1 = 0;
1332 if (x2 > im->xsize)
1333 x2 = im->xsize;
1334 if (y2 >= im->ysize)
1335 y2 = im->ysize-1;
1336 if (x1 >= x2 || y1 > y2)
1337 return;
9b1ec2b8
TC
1338
1339 i_render_init(&r, im, x2-x1);
1340 while (y1 <= y2) {
1341 i_render_fill(&r, x1, y1, x2-x1, NULL, fill);
1342 ++y1;
f1ac5027 1343 }
9b1ec2b8 1344 i_render_done(&r);
f1ac5027 1345}
02d1d628 1346
aa833c97 1347/*
5715f7c3 1348=item i_line(C<im>, C<x1>, C<y1>, C<x2>, C<y2>, C<color>, C<endp>)
aa833c97 1349
92bda632
TC
1350=category Drawing
1351
5715f7c3 1352=for stopwords Bresenham's
aa833c97 1353
5715f7c3
TC
1354Draw a line to image using Bresenham's line drawing algorithm
1355
1356 im - image to draw to
1357 x1 - starting x coordinate
1358 y1 - starting x coordinate
1359 x2 - starting x coordinate
1360 y2 - starting x coordinate
1361 color - color to write to image
1362 endp - endpoint flag (boolean)
aa833c97
AMH
1363
1364=cut
1365*/
1366
02d1d628 1367void
8d14daab
TC
1368i_line(i_img *im, i_img_dim x1, i_img_dim y1, i_img_dim x2, i_img_dim y2, const i_color *val, int endp) {
1369 i_img_dim x, y;
1370 i_img_dim dx, dy;
1371 i_img_dim p;
02d1d628 1372
aa833c97
AMH
1373 dx = x2 - x1;
1374 dy = y2 - y1;
02d1d628 1375
aa833c97
AMH
1376
1377 /* choose variable to iterate on */
8d14daab
TC
1378 if (i_abs(dx) > i_abs(dy)) {
1379 i_img_dim dx2, dy2, cpy;
aa833c97
AMH
1380
1381 /* sort by x */
1382 if (x1 > x2) {
8d14daab 1383 i_img_dim t;
aa833c97
AMH
1384 t = x1; x1 = x2; x2 = t;
1385 t = y1; y1 = y2; y2 = t;
02d1d628 1386 }
aa833c97 1387
8d14daab 1388 dx = i_abs(dx);
aa833c97
AMH
1389 dx2 = dx*2;
1390 dy = y2 - y1;
1391
1392 if (dy<0) {
1393 dy = -dy;
1394 cpy = -1;
1395 } else {
1396 cpy = 1;
1397 }
1398 dy2 = dy*2;
1399 p = dy2 - dx;
1400
1401
1402 y = y1;
1403 for(x=x1; x<x2-1; x++) {
1404 if (p<0) {
1405 p += dy2;
1406 } else {
1407 y += cpy;
1408 p += dy2-dx2;
1409 }
1410 i_ppix(im, x+1, y, val);
02d1d628 1411 }
aa833c97 1412 } else {
8d14daab 1413 i_img_dim dy2, dx2, cpx;
aa833c97
AMH
1414
1415 /* sort bx y */
1416 if (y1 > y2) {
8d14daab 1417 i_img_dim t;
aa833c97
AMH
1418 t = x1; x1 = x2; x2 = t;
1419 t = y1; y1 = y2; y2 = t;
1420 }
1421
8d14daab 1422 dy = i_abs(dy);
aa833c97
AMH
1423 dx = x2 - x1;
1424 dy2 = dy*2;
1425
1426 if (dx<0) {
1427 dx = -dx;
1428 cpx = -1;
1429 } else {
1430 cpx = 1;
1431 }
1432 dx2 = dx*2;
1433 p = dx2 - dy;
1434
1435 x = x1;
1436
1437 for(y=y1; y<y2-1; y++) {
1438 if (p<0) {
1439 p += dx2;
1440 } else {
1441 x += cpx;
1442 p += dx2-dy2;
1443 }
1444 i_ppix(im, x, y+1, val);
1445 }
1446 }
1447 if (endp) {
1448 i_ppix(im, x1, y1, val);
1449 i_ppix(im, x2, y2, val);
1450 } else {
1451 if (x1 != x2 || y1 != y2)
1452 i_ppix(im, x1, y1, val);
1453 }
02d1d628
AMH
1454}
1455
aa833c97 1456
02d1d628 1457void
8d14daab 1458i_line_dda(i_img *im, i_img_dim x1, i_img_dim y1, i_img_dim x2, i_img_dim y2, i_color *val) {
b437ce0a 1459
8d14daab
TC
1460 double dy;
1461 i_img_dim x;
b437ce0a
AMH
1462
1463 for(x=x1; x<=x2; x++) {
8d14daab
TC
1464 dy = y1+ (x-x1)/(double)(x2-x1)*(y2-y1);
1465 i_ppix(im, x, (i_img_dim)(dy+0.5), val);
b437ce0a
AMH
1466 }
1467}
1468
92bda632 1469/*
5715f7c3 1470=item i_line_aa(C<im>, C<x1>, C<x2>, C<y1>, C<y2>, C<color>, C<endp>)
92bda632
TC
1471
1472=category Drawing
1473
5715f7c3 1474Anti-alias draws a line from (x1,y1) to (x2, y2) in color.
b437ce0a 1475
5715f7c3 1476The point (x2, y2) is drawn only if C<endp> is set.
92bda632
TC
1477
1478=cut
1479*/
b437ce0a
AMH
1480
1481void
8d14daab
TC
1482i_line_aa(i_img *im, i_img_dim x1, i_img_dim y1, i_img_dim x2, i_img_dim y2, const i_color *val, int endp) {
1483 i_img_dim x, y;
1484 i_img_dim dx, dy;
1485 i_img_dim p;
b437ce0a
AMH
1486
1487 dx = x2 - x1;
1488 dy = y2 - y1;
1489
1490 /* choose variable to iterate on */
8d14daab
TC
1491 if (i_abs(dx) > i_abs(dy)) {
1492 i_img_dim dx2, dy2, cpy;
b437ce0a
AMH
1493
1494 /* sort by x */
1495 if (x1 > x2) {
8d14daab 1496 i_img_dim t;
b437ce0a
AMH
1497 t = x1; x1 = x2; x2 = t;
1498 t = y1; y1 = y2; y2 = t;
1499 }
1500
8d14daab 1501 dx = i_abs(dx);
b437ce0a
AMH
1502 dx2 = dx*2;
1503 dy = y2 - y1;
1504
1505 if (dy<0) {
1506 dy = -dy;
1507 cpy = -1;
1508 } else {
1509 cpy = 1;
1510 }
1511 dy2 = dy*2;
1512 p = dy2 - dx2; /* this has to be like this for AA */
1513
1514 y = y1;
1515
1516 for(x=x1; x<x2-1; x++) {
1517 int ch;
1518 i_color tval;
8d14daab
TC
1519 double t = (dy) ? -(float)(p)/(float)(dx2) : 1;
1520 double t1, t2;
b437ce0a
AMH
1521
1522 if (t<0) t = 0;
1523 t1 = 1-t;
1524 t2 = t;
1525
1526 i_gpix(im,x+1,y,&tval);
1527 for(ch=0;ch<im->channels;ch++)
1528 tval.channel[ch]=(unsigned char)(t1*(float)tval.channel[ch]+t2*(float)val->channel[ch]);
1529 i_ppix(im,x+1,y,&tval);
1530
1531 i_gpix(im,x+1,y+cpy,&tval);
1532 for(ch=0;ch<im->channels;ch++)
1533 tval.channel[ch]=(unsigned char)(t2*(float)tval.channel[ch]+t1*(float)val->channel[ch]);
1534 i_ppix(im,x+1,y+cpy,&tval);
1535
1536 if (p<0) {
1537 p += dy2;
1538 } else {
1539 y += cpy;
1540 p += dy2-dx2;
1541 }
1542 }
1543 } else {
8d14daab 1544 i_img_dim dy2, dx2, cpx;
b437ce0a
AMH
1545
1546 /* sort bx y */
1547 if (y1 > y2) {
8d14daab 1548 i_img_dim t;
b437ce0a
AMH
1549 t = x1; x1 = x2; x2 = t;
1550 t = y1; y1 = y2; y2 = t;
1551 }
1552
8d14daab 1553 dy = i_abs(dy);
b437ce0a
AMH
1554 dx = x2 - x1;
1555 dy2 = dy*2;
1556
1557 if (dx<0) {
1558 dx = -dx;
1559 cpx = -1;
1560 } else {
1561 cpx = 1;
1562 }
1563 dx2 = dx*2;
1564 p = dx2 - dy2; /* this has to be like this for AA */
1565
1566 x = x1;
1567
1568 for(y=y1; y<y2-1; y++) {
1569 int ch;
1570 i_color tval;
8d14daab
TC
1571 double t = (dx) ? -(double)(p)/(double)(dy2) : 1;
1572 double t1, t2;
b437ce0a
AMH
1573
1574 if (t<0) t = 0;
1575 t1 = 1-t;
1576 t2 = t;
1577
1578 i_gpix(im,x,y+1,&tval);
1579 for(ch=0;ch<im->channels;ch++)
8d14daab 1580 tval.channel[ch]=(unsigned char)(t1*(double)tval.channel[ch]+t2*(double)val->channel[ch]);
b437ce0a
AMH
1581 i_ppix(im,x,y+1,&tval);
1582
1583 i_gpix(im,x+cpx,y+1,&tval);
1584 for(ch=0;ch<im->channels;ch++)
8d14daab 1585 tval.channel[ch]=(unsigned char)(t2*(double)tval.channel[ch]+t1*(double)val->channel[ch]);
b437ce0a
AMH
1586 i_ppix(im,x+cpx,y+1,&tval);
1587
1588 if (p<0) {
1589 p += dx2;
1590 } else {
1591 x += cpx;
1592 p += dx2-dy2;
1593 }
1594 }
1595 }
1596
1597
1598 if (endp) {
1599 i_ppix(im, x1, y1, val);
1600 i_ppix(im, x2, y2, val);
1601 } else {
1602 if (x1 != x2 || y1 != y2)
1603 i_ppix(im, x1, y1, val);
1604 }
1605}
1606
1607
1608
b33c08f8 1609static double
8d14daab 1610perm(i_img_dim n,i_img_dim k) {
02d1d628 1611 double r;
8d14daab 1612 i_img_dim i;
02d1d628
AMH
1613 r=1;
1614 for(i=k+1;i<=n;i++) r*=i;
1615 for(i=1;i<=(n-k);i++) r/=i;
1616 return r;
1617}
1618
1619
1620/* Note in calculating t^k*(1-t)^(n-k)
1621 we can start by using t^0=1 so this simplifies to
1622 t^0*(1-t)^n - we want to multiply that with t/(1-t) each iteration
1623 to get a new level - this may lead to errors who knows lets test it */
1624
1625void
97ac0a96 1626i_bezier_multi(i_img *im,int l,const double *x,const double *y, const i_color *val) {
02d1d628
AMH
1627 double *bzcoef;
1628 double t,cx,cy;
1629 int k,i;
8d14daab 1630 i_img_dim lx = 0,ly = 0;
02d1d628
AMH
1631 int n=l-1;
1632 double itr,ccoef;
1633
f0960b14
TC
1634 /* this is the same size as the x and y arrays, so shouldn't overflow */
1635 bzcoef=mymalloc(sizeof(double)*l); /* checked 5jul05 tonyc */
02d1d628
AMH
1636 for(k=0;k<l;k++) bzcoef[k]=perm(n,k);
1637 ICL_info(val);
1638
1639
1640 /* for(k=0;k<l;k++) printf("bzcoef: %d -> %f\n",k,bzcoef[k]); */
1641 i=0;
1642 for(t=0;t<=1;t+=0.005) {
1643 cx=cy=0;
1644 itr=t/(1-t);
1645 ccoef=pow(1-t,n);
1646 for(k=0;k<l;k++) {
1647 /* cx+=bzcoef[k]*x[k]*pow(t,k)*pow(1-t,n-k);
1648 cy+=bzcoef[k]*y[k]*pow(t,k)*pow(1-t,n-k);*/
1649
1650 cx+=bzcoef[k]*x[k]*ccoef;
1651 cy+=bzcoef[k]*y[k]*ccoef;
1652 ccoef*=itr;
1653 }
1654 /* printf("%f -> (%d,%d)\n",t,(int)(0.5+cx),(int)(0.5+cy)); */
1655 if (i++) {
8d14daab 1656 i_line_aa(im,lx,ly,(i_img_dim)(0.5+cx),(i_img_dim)(0.5+cy),val, 1);
02d1d628 1657 }
8d14daab
TC
1658 /* i_ppix(im,(i_img_dim)(0.5+cx),(i_img_dim)(0.5+cy),val); */
1659 lx=(i_img_dim)(0.5+cx);
1660 ly=(i_img_dim)(0.5+cy);
02d1d628
AMH
1661 }
1662 ICL_info(val);
1663 myfree(bzcoef);
1664}
1665
02d1d628
AMH
1666/* Flood fill
1667
1668 REF: Graphics Gems I. page 282+
1669
1670*/
1671
02d1d628
AMH
1672/* This should be moved into a seperate file? */
1673
1674/* This is the truncation used:
1675
1676 a double is multiplied by 16 and then truncated.
1677 This means that 0 -> 0
1678 So a triangle of (0,0) (10,10) (10,0) Will look like it's
1679 not filling the (10,10) point nor the (10,0)-(10,10) line segment
1680
1681*/
1682
1683
02d1d628
AMH
1684/* Flood fill algorithm - based on the Ken Fishkins (pixar) gem in
1685 graphics gems I */
1686
1687/*
1688struct stc {
8d14daab
TC
1689 i_img_dim mylx,myrx;
1690 i_img_dim dadlx,dadrx;
1691 i_img_dim myy;
02d1d628
AMH
1692 int mydirection;
1693};
1694
1695Not used code???
1696*/
1697
1698
1699struct stack_element {
8d14daab
TC
1700 i_img_dim myLx,myRx;
1701 i_img_dim dadLx,dadRx;
1702 i_img_dim myY;
02d1d628
AMH
1703 int myDirection;
1704};
1705
1706
1707/* create the link data to put push onto the stack */
1708
1709static
1710struct stack_element*
8d14daab 1711crdata(i_img_dim left,i_img_dim right,i_img_dim dadl,i_img_dim dadr,i_img_dim y, int dir) {
02d1d628 1712 struct stack_element *ste;
f0960b14 1713 ste = mymalloc(sizeof(struct stack_element)); /* checked 5jul05 tonyc */
a73aeb5f
AMH
1714 ste->myLx = left;
1715 ste->myRx = right;
1716 ste->dadLx = dadl;
1717 ste->dadRx = dadr;
1718 ste->myY = y;
1719 ste->myDirection = dir;
02d1d628
AMH
1720 return ste;
1721}
1722
1723/* i_ccomp compares two colors and gives true if they are the same */
1724
3efb0915
TC
1725typedef int (*ff_cmpfunc)(i_color const *c1, i_color const *c2, int channels);
1726
02d1d628 1727static int
3efb0915 1728i_ccomp_normal(i_color const *val1, i_color const *val2, int ch) {
02d1d628 1729 int i;
3efb0915
TC
1730 for(i = 0; i < ch; i++)
1731 if (val1->channel[i] !=val2->channel[i])
1732 return 0;
02d1d628
AMH
1733 return 1;
1734}
1735
3efb0915
TC
1736static int
1737i_ccomp_border(i_color const *val1, i_color const *val2, int ch) {
1738 int i;
1739 for(i = 0; i < ch; i++)
1740 if (val1->channel[i] !=val2->channel[i])
1741 return 1;
1742 return 0;
1743}
02d1d628
AMH
1744
1745static int
8d14daab 1746i_lspan(i_img *im, i_img_dim seedx, i_img_dim seedy, i_color const *val, ff_cmpfunc cmpfunc) {
02d1d628
AMH
1747 i_color cval;
1748 while(1) {
1749 if (seedx-1 < 0) break;
1750 i_gpix(im,seedx-1,seedy,&cval);
3efb0915
TC
1751 if (!cmpfunc(val,&cval,im->channels))
1752 break;
02d1d628
AMH
1753 seedx--;
1754 }
1755 return seedx;
1756}
1757
1758static int
8d14daab 1759i_rspan(i_img *im, i_img_dim seedx, i_img_dim seedy, i_color const *val, ff_cmpfunc cmpfunc) {
02d1d628
AMH
1760 i_color cval;
1761 while(1) {
1762 if (seedx+1 > im->xsize-1) break;
1763 i_gpix(im,seedx+1,seedy,&cval);
3efb0915 1764 if (!cmpfunc(val,&cval,im->channels)) break;
02d1d628
AMH
1765 seedx++;
1766 }
1767 return seedx;
1768}
1769
6ddf3547
TC
1770#ifdef DEBUG_FLOOD_FILL
1771
1772#define ST_PUSH_NOTE(left, right, dadl, dadr, y, dir) \
1773 fprintf(stderr, "push(left %" i_DF ", right %" i_DF ", dadleft %" i_DF ", dadright %" i_DF ", y %" i_DF ", dir %d, line %d)\n", \
1774 i_DFc(left), i_DFc(right), i_DFc(dadl), i_DFc(dadr), i_DFc(y), (dir), __LINE__)
1775
1776#define ST_POP_NOTE(left, right, dadl, dadr, y, dir) \
1777 fprintf(stderr, "popped(left %" i_DF ", right %" i_DF ", dadleft %" i_DF ", dadright %" i_DF ", y %" i_DF ", dir %d, line %d)\n", \
1778 i_DFc(left), i_DFc(right), i_DFc(dadl), i_DFc(dadr), i_DFc(y), (dir), __LINE__)
1779
1780#define ST_STACK_NOTE(dadl, dadr, left, right, y, dir) \
1781 fprintf(stderr, "stack(left %" i_DF ", right %" i_DF ", dadleft %" i_DF ", dadright %" i_DF ", y %" i_DF ", dir %d, line %d)\n", \
1782 i_DFc(left), i_DFc(right), i_DFc(dadl), i_DFc(dadr), i_DFc(y), (dir), __LINE__)
1783
1784#else
1785
1786#define ST_PUSH_NOTE(left, right, dadl, dadr, y, dir)
1787
1788#define ST_POP_NOTE(left, right, dadl, dadr, y, dir)
1789
1790#define ST_STACK_NOTE(dadl, dadr, left, right, y, dir)
1791
1792#endif
1793
1794
02d1d628
AMH
1795/* Macro to create a link and push on to the list */
1796
e25e59b1
AMH
1797#define ST_PUSH(left,right,dadl,dadr,y,dir) do { \
1798 struct stack_element *s = crdata(left,right,dadl,dadr,y,dir); \
6ddf3547 1799 ST_PUSH_NOTE(left, right, dadl, dadr, y, dir); \
e25e59b1
AMH
1800 llist_push(st,&s); \
1801} while (0)
02d1d628
AMH
1802
1803/* pops the shadow on TOS into local variables lx,rx,y,direction,dadLx and dadRx */
1804/* No overflow check! */
1805
e25e59b1
AMH
1806#define ST_POP() do { \
1807 struct stack_element *s; \
1808 llist_pop(st,&s); \
1809 lx = s->myLx; \
1810 rx = s->myRx; \
1811 dadLx = s->dadLx; \
1812 dadRx = s->dadRx; \
1813 y = s->myY; \
1814 direction = s->myDirection; \
6ddf3547 1815 ST_POP_NOTE(lx, rx, dadLx, dadRx, y, direction); \
e25e59b1
AMH
1816 myfree(s); \
1817} while (0)
1818
1819#define ST_STACK(dir,dadLx,dadRx,lx,rx,y) do { \
8d14daab
TC
1820 i_img_dim pushrx = rx+1; \
1821 i_img_dim pushlx = lx-1; \
6ddf3547 1822 ST_STACK_NOTE(lx, rx, dadLx, dadRx, y, dir); \
e25e59b1
AMH
1823 ST_PUSH(lx,rx,pushlx,pushrx,y+dir,dir); \
1824 if (rx > dadRx) \
1825 ST_PUSH(dadRx+1,rx,pushlx,pushrx,y-dir,-dir); \
6ddf3547
TC
1826 if (lx < dadLx) \
1827 ST_PUSH(lx,dadLx-1,pushlx,pushrx,y-dir,-dir); \
e25e59b1
AMH
1828} while (0)
1829
1830#define SET(x,y) btm_set(btm,x,y)
02d1d628 1831
86d20cb9 1832/* INSIDE returns true if pixel is correct color and we haven't set it before. */
6ddf3547
TC
1833#define INSIDE(x,y, seed) \
1834 (assert((x) >= 0 && (x) < (im)->xsize && (y) >= 0 && (y) < (im)->ysize), \
1835 (!btm_test(btm,x,y) && \
1836 ( i_gpix(im,x,y,&cval),cmpfunc(seed,&cval,channels) ) ))
02d1d628 1837
aa833c97
AMH
1838/* The function that does all the real work */
1839
1840static struct i_bitmap *
8d14daab
TC
1841i_flood_fill_low(i_img *im,i_img_dim seedx,i_img_dim seedy,
1842 i_img_dim *bxminp, i_img_dim *bxmaxp, i_img_dim *byminp, i_img_dim *bymaxp,
3efb0915 1843 i_color const *seed, ff_cmpfunc cmpfunc) {
8d14daab
TC
1844 i_img_dim ltx, rtx;
1845 i_img_dim tx = 0;
02d1d628 1846
8d14daab
TC
1847 i_img_dim bxmin = seedx;
1848 i_img_dim bxmax = seedx;
1849 i_img_dim bymin = seedy;
1850 i_img_dim bymax = seedy;
02d1d628
AMH
1851
1852 struct llist *st;
1853 struct i_bitmap *btm;
1854
8d14daab
TC
1855 int channels;
1856 i_img_dim xsize,ysize;
6ddf3547 1857 i_color cval; /* used by the INSIDE() macro */
02d1d628 1858
a73aeb5f
AMH
1859 channels = im->channels;
1860 xsize = im->xsize;
1861 ysize = im->ysize;
02d1d628 1862
86d20cb9
AMH
1863 btm = btm_new(xsize, ysize);
1864 st = llist_new(100, sizeof(struct stack_element*));
02d1d628 1865
02d1d628 1866 /* Find the starting span and fill it */
3efb0915
TC
1867 ltx = i_lspan(im, seedx, seedy, seed, cmpfunc);
1868 rtx = i_rspan(im, seedx, seedy, seed, cmpfunc);
aa833c97 1869 for(tx=ltx; tx<=rtx; tx++) SET(tx, seedy);
353eb6e7
TC
1870 bxmin = ltx;
1871 bxmax = rtx;
02d1d628 1872
aa833c97
AMH
1873 ST_PUSH(ltx, rtx, ltx, rtx, seedy+1, 1);
1874 ST_PUSH(ltx, rtx, ltx, rtx, seedy-1, -1);
02d1d628
AMH
1875
1876 while(st->count) {
aa833c97 1877 /* Stack variables */
8d14daab
TC
1878 i_img_dim lx,rx;
1879 i_img_dim dadLx,dadRx;
1880 i_img_dim y;
aa833c97 1881 int direction;
e25e59b1 1882
8d14daab 1883 i_img_dim x;
aa833c97 1884 int wasIn=0;
02d1d628 1885
aa833c97
AMH
1886 ST_POP(); /* sets lx, rx, dadLx, dadRx, y, direction */
1887
1888
1889 if (y<0 || y>ysize-1) continue;
02d1d628
AMH
1890 if (bymin > y) bymin=y; /* in the worst case an extra line */
1891 if (bymax < y) bymax=y;
1892
e25e59b1
AMH
1893
1894 x = lx+1;
3efb0915 1895 if ( lx >= 0 && (wasIn = INSIDE(lx, y, seed)) ) {
aa833c97 1896 SET(lx, y);
02d1d628 1897 lx--;
95b9922f 1898 while(lx >= 0 && INSIDE(lx, y, seed)) {
02d1d628
AMH
1899 SET(lx,y);
1900 lx--;
1901 }
6ddf3547
TC
1902 /* lx should point at the left-most INSIDE() pixel */
1903 ++lx;
02d1d628
AMH
1904 }
1905
86d20cb9 1906 if (bxmin > lx) bxmin = lx;
02d1d628
AMH
1907 while(x <= xsize-1) {
1908 /* printf("x=%d\n",x); */
1909 if (wasIn) {
1910
3efb0915 1911 if (INSIDE(x, y, seed)) {
02d1d628
AMH
1912 /* case 1: was inside, am still inside */
1913 SET(x,y);
1914 } else {
1915 /* case 2: was inside, am no longer inside: just found the
1916 right edge of a span */
aa833c97 1917 ST_STACK(direction, dadLx, dadRx, lx, (x-1), y);
02d1d628 1918
aa833c97 1919 if (bxmax < x) bxmax = x;
02d1d628
AMH
1920 wasIn=0;
1921 }
1922 } else {
aa833c97 1923 if (x > rx) goto EXT;
3efb0915 1924 if (INSIDE(x, y, seed)) {
aa833c97 1925 SET(x, y);
02d1d628 1926 /* case 3: Wasn't inside, am now: just found the start of a new run */
aa833c97
AMH
1927 wasIn = 1;
1928 lx = x;
02d1d628
AMH
1929 } else {
1930 /* case 4: Wasn't inside, still isn't */
1931 }
1932 }
1933 x++;
1934 }
1935 EXT: /* out of loop */
1936 if (wasIn) {
1937 /* hit an edge of the frame buffer while inside a run */
aa833c97
AMH
1938 ST_STACK(direction, dadLx, dadRx, lx, (x-1), y);
1939 if (bxmax < x) bxmax = x;
02d1d628
AMH
1940 }
1941 }
02d1d628 1942
02d1d628 1943 llist_destroy(st);
cc6483e0 1944
aa833c97
AMH
1945 *bxminp = bxmin;
1946 *bxmaxp = bxmax;
1947 *byminp = bymin;
1948 *bymaxp = bymax;
cc6483e0 1949
aa833c97
AMH
1950 return btm;
1951}
cc6483e0 1952
92bda632 1953/*
5715f7c3 1954=item i_flood_fill(C<im>, C<seedx>, C<seedy>, C<color>)
92bda632
TC
1955
1956=category Drawing
1957=synopsis i_flood_fill(im, 50, 50, &color);
cc6483e0 1958
5715f7c3
TC
1959Flood fills the 4-connected region starting from the point (C<seedx>,
1960C<seedy>) with I<color>.
cc6483e0 1961
5715f7c3 1962Returns false if (C<seedx>, C<seedy>) are outside the image.
92bda632
TC
1963
1964=cut
1965*/
cc6483e0 1966
aa833c97 1967undef_int
8d14daab
TC
1968i_flood_fill(i_img *im, i_img_dim seedx, i_img_dim seedy, const i_color *dcol) {
1969 i_img_dim bxmin, bxmax, bymin, bymax;
aa833c97 1970 struct i_bitmap *btm;
8d14daab 1971 i_img_dim x, y;
3efb0915 1972 i_color val;
af22c916 1973 dIMCTXim(im);
dc95a369 1974
857e686a
TC
1975 im_log((aIMCTX, 1, "i_flood_fill(im %p, seed(" i_DFp "), col %p)",
1976 im, i_DFcp(seedx, seedy), dcol));
1977
af22c916 1978 im_clear_error(aIMCTX);
aa833c97
AMH
1979 if (seedx < 0 || seedx >= im->xsize ||
1980 seedy < 0 || seedy >= im->ysize) {
af22c916 1981 im_push_error(aIMCTX, 0, "i_flood_cfill: Seed pixel outside of image");
aa833c97 1982 return 0;
cc6483e0 1983 }
cc6483e0 1984
3efb0915
TC
1985 /* Get the reference color */
1986 i_gpix(im, seedx, seedy, &val);
1987
1988 btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax,
1989 &val, i_ccomp_normal);
cc6483e0 1990
aa833c97
AMH
1991 for(y=bymin;y<=bymax;y++)
1992 for(x=bxmin;x<=bxmax;x++)
1993 if (btm_test(btm,x,y))
1994 i_ppix(im,x,y,dcol);
1995 btm_destroy(btm);
1996 return 1;
cc6483e0
TC
1997}
1998
92bda632 1999/*
5715f7c3 2000=item i_flood_cfill(C<im>, C<seedx>, C<seedy>, C<fill>)
92bda632
TC
2001
2002=category Drawing
2003=synopsis i_flood_cfill(im, 50, 50, fill);
aa833c97 2004
5715f7c3
TC
2005Flood fills the 4-connected region starting from the point (C<seedx>,
2006C<seedy>) with C<fill>.
92bda632 2007
5715f7c3 2008Returns false if (C<seedx>, C<seedy>) are outside the image.
92bda632
TC
2009
2010=cut
2011*/
aa833c97 2012
a321d497 2013undef_int
8d14daab
TC
2014i_flood_cfill(i_img *im, i_img_dim seedx, i_img_dim seedy, i_fill_t *fill) {
2015 i_img_dim bxmin, bxmax, bymin, bymax;
cc6483e0 2016 struct i_bitmap *btm;
3efb0915 2017 i_color val;
af22c916 2018 dIMCTXim(im);
cc6483e0 2019
857e686a
TC
2020 im_log((aIMCTX, 1, "i_flood_cfill(im %p, seed(" i_DFp "), fill %p)",
2021 im, i_DFcp(seedx, seedy), fill));
2022
af22c916 2023 im_clear_error(aIMCTX);
a321d497
AMH
2024
2025 if (seedx < 0 || seedx >= im->xsize ||
2026 seedy < 0 || seedy >= im->ysize) {
af22c916 2027 im_push_error(aIMCTX, 0, "i_flood_cfill: Seed pixel outside of image");
a321d497
AMH
2028 return 0;
2029 }
2030
3efb0915
TC
2031 /* Get the reference color */
2032 i_gpix(im, seedx, seedy, &val);
2033
2034 btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax,
2035 &val, i_ccomp_normal);
2036
2037 cfill_from_btm(im, fill, btm, bxmin, bxmax, bymin, bymax);
2038
2039 btm_destroy(btm);
2040 return 1;
2041}
2042
2043/*
5715f7c3 2044=item i_flood_fill_border(C<im>, C<seedx>, C<seedy>, C<color>, C<border>)
3efb0915
TC
2045
2046=category Drawing
2047=synopsis i_flood_fill_border(im, 50, 50, &color, &border);
2048
5715f7c3
TC
2049Flood fills the 4-connected region starting from the point (C<seedx>,
2050C<seedy>) with C<color>, fill stops when the fill reaches a pixels
2051with color C<border>.
3efb0915 2052
5715f7c3 2053Returns false if (C<seedx>, C<seedy>) are outside the image.
3efb0915
TC
2054
2055=cut
2056*/
2057
2058undef_int
8d14daab 2059i_flood_fill_border(i_img *im, i_img_dim seedx, i_img_dim seedy, const i_color *dcol,
3efb0915 2060 const i_color *border) {
8d14daab 2061 i_img_dim bxmin, bxmax, bymin, bymax;
3efb0915 2062 struct i_bitmap *btm;
8d14daab 2063 i_img_dim x, y;
af22c916 2064 dIMCTXim(im);
dc95a369 2065
857e686a
TC
2066 im_log((aIMCTX, 1, "i_flood_cfill(im %p, seed(" i_DFp "), dcol %p, border %p)",
2067 im, i_DFcp(seedx, seedy), dcol, border));
2068
af22c916 2069 im_clear_error(aIMCTX);
3efb0915
TC
2070 if (seedx < 0 || seedx >= im->xsize ||
2071 seedy < 0 || seedy >= im->ysize) {
af22c916 2072 im_push_error(aIMCTX, 0, "i_flood_cfill: Seed pixel outside of image");
3efb0915
TC
2073 return 0;
2074 }
2075
2076 btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax,
2077 border, i_ccomp_border);
2078
2079 for(y=bymin;y<=bymax;y++)
2080 for(x=bxmin;x<=bxmax;x++)
2081 if (btm_test(btm,x,y))
2082 i_ppix(im,x,y,dcol);
2083 btm_destroy(btm);
2084 return 1;
2085}
2086
2087/*
5715f7c3 2088=item i_flood_cfill_border(C<im>, C<seedx>, C<seedy>, C<fill>, C<border>)
3efb0915
TC
2089
2090=category Drawing
2091=synopsis i_flood_cfill_border(im, 50, 50, fill, border);
2092
5715f7c3
TC
2093Flood fills the 4-connected region starting from the point (C<seedx>,
2094C<seedy>) with C<fill>, the fill stops when it reaches pixels of color
2095C<border>.
3efb0915 2096
5715f7c3 2097Returns false if (C<seedx>, C<seedy>) are outside the image.
3efb0915
TC
2098
2099=cut
2100*/
2101
2102undef_int
8d14daab 2103i_flood_cfill_border(i_img *im, i_img_dim seedx, i_img_dim seedy, i_fill_t *fill,
3efb0915 2104 const i_color *border) {
8d14daab 2105 i_img_dim bxmin, bxmax, bymin, bymax;
3efb0915 2106 struct i_bitmap *btm;
af22c916 2107 dIMCTXim(im);
dc95a369 2108
857e686a
TC
2109 im_log((aIMCTX, 1, "i_flood_cfill_border(im %p, seed(" i_DFp "), fill %p, border %p)",
2110 im, i_DFcp(seedx, seedy), fill, border));
2111
af22c916 2112 im_clear_error(aIMCTX);
3efb0915
TC
2113
2114 if (seedx < 0 || seedx >= im->xsize ||
2115 seedy < 0 || seedy >= im->ysize) {
af22c916 2116 im_push_error(aIMCTX, 0, "i_flood_cfill_border: Seed pixel outside of image");
3efb0915
TC
2117 return 0;
2118 }
2119
2120 btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax,
2121 border, i_ccomp_border);
2122
2123 cfill_from_btm(im, fill, btm, bxmin, bxmax, bymin, bymax);
2124
2125 btm_destroy(btm);
2126
2127 return 1;
2128}
2129
2130static void
2131cfill_from_btm(i_img *im, i_fill_t *fill, struct i_bitmap *btm,
8d14daab
TC
2132 i_img_dim bxmin, i_img_dim bxmax, i_img_dim bymin, i_img_dim bymax) {
2133 i_img_dim x, y;
2134 i_img_dim start;
cc6483e0 2135
9b1ec2b8
TC
2136 i_render r;
2137
2138 i_render_init(&r, im, bxmax - bxmin + 1);
2139
2140 for(y=bymin; y<=bymax; y++) {
2141 x = bxmin;
2142 while (x <= bxmax) {
2143 while (x <= bxmax && !btm_test(btm, x, y)) {
2144 ++x;
cc6483e0 2145 }
9b1ec2b8
TC
2146 if (btm_test(btm, x, y)) {
2147 start = x;
2148 while (x <= bxmax && btm_test(btm, x, y)) {
2149 ++x;
2150 }
2151 i_render_fill(&r, start, y, x-start, NULL, fill);
cc6483e0
TC
2152 }
2153 }
cc6483e0 2154 }
9b1ec2b8 2155 i_render_done(&r);
cc6483e0 2156}
12db268a
TC
2157
2158/*
2159=back
2160
2161=cut
2162*/