note GIF changes
[imager.git] / datatypes.c
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1#include <stdlib.h>
2#include <stdio.h>
35891892 3#include <string.h>
5eafd12c 4#define IMAGER_NO_CONTEXT
e310e5f9 5#include "imager.h"
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6
7/*
8 2d bitmask with test and set operations
9*/
10
11struct i_bitmap*
8d14daab 12btm_new(i_img_dim xsize,i_img_dim ysize) {
8d14daab 13 size_t bytes;
02d1d628 14 struct i_bitmap *btm;
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15 btm=(struct i_bitmap*)mymalloc(sizeof(struct i_bitmap)); /* checked 4jul05 tonyc */
16 bytes = (xsize*ysize+8)/8;
17 if (bytes * 8 / ysize < xsize-1) { /* this is kind of rough */
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18 fprintf(stderr, "Integer overflow allocating bitmap (" i_DFp ")",
19 i_DFcp(xsize, ysize));
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20 exit(3);
21 }
22 btm->data=(char*)mymalloc(bytes); /* checked 4jul05 tonyc */
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23 btm->xsize=xsize;
24 btm->ysize=ysize;
b934971a 25 memset(btm->data, 0, bytes);
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26 return btm;
27}
28
29
30void
31btm_destroy(struct i_bitmap *btm) {
32 myfree(btm->data);
33 myfree(btm);
34}
35
36
37int
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38btm_test(struct i_bitmap *btm,i_img_dim x,i_img_dim y) {
39 i_img_dim btno;
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40 if (x<0 || x>btm->xsize-1 || y<0 || y>btm->ysize-1) return 0;
41 btno=btm->xsize*y+x;
42 return (1<<(btno%8))&(btm->data[btno/8]);
43}
44
45void
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46btm_set(struct i_bitmap *btm,i_img_dim x,i_img_dim y) {
47 i_img_dim btno;
e25e59b1 48 if (x<0 || x>btm->xsize-1 || y<0 || y>btm->ysize-1) abort();
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49 btno=btm->xsize*y+x;
50 btm->data[btno/8]|=1<<(btno%8);
51}
52
53
54
55
56
57/*
a73aeb5f 58 Bucketed linked list - stack type
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59*/
60
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61static struct llink *
62llink_new(struct llink* p,size_t size);
63static int
64llist_llink_push(struct llist *lst, struct llink *lnk,const void *data);
65static void
66llink_destroy(struct llink* l);
02d1d628 67
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68/*
69=item llist_new()
70=synopsis struct llist *l = llist_new(100, sizeof(foo);
02d1d628 71
8d14daab 72Create a new stack structure. Implemented as a linked list of pools.
02d1d628 73
8d14daab 74Parameters:
02d1d628 75
8d14daab 76=over
02d1d628 77
8d14daab 78=item *
02d1d628 79
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80multip - number of entries in each pool
81
82=item *
83
84ssize - size of the objects being pushed/popped
85
86=back
87
88=cut
89*/
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90
91struct llist *
8d14daab 92llist_new(int multip, size_t ssize) {
02d1d628 93 struct llist *l;
f0960b14 94 l = mymalloc(sizeof(struct llist)); /* checked 4jul05 tonyc */
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95 l->h = NULL;
96 l->t = NULL;
97 l->multip = multip;
98 l->ssize = ssize;
99 l->count = 0;
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100 return l;
101}
102
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103/*
104=item llist_push()
105=synopsis llist_push(l, &foo);
106
107Push an item on the stack.
108
109=cut
110*/
111
02d1d628 112void
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113llist_push(struct llist *l,const void *data) {
114 size_t ssize = l->ssize;
a73aeb5f 115 int multip = l->multip;
02d1d628 116
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117 /* fprintf(stderr,"llist_push: data=0x%08X\n",data);
118 fprintf(stderr,"Chain size: %d\n", l->count); */
119
120 if (l->t == NULL) {
121 l->t = l->h = llink_new(NULL,ssize*multip); /* Tail is empty - list is empty */
122 /* fprintf(stderr,"Chain empty - extended\n"); */
123 }
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124 else { /* Check for overflow in current tail */
125 if (l->t->fill >= l->multip) {
a73aeb5f 126 struct llink* nt = llink_new(l->t, ssize*multip);
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127 l->t->n=nt;
128 l->t=nt;
129 /* fprintf(stderr,"Chain extended\n"); */
130 }
131 }
132 /* fprintf(stderr,"0x%08X\n",l->t); */
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133 if (llist_llink_push(l,l->t,data)) {
134 dIMCTX;
135 im_fatal(aIMCTX, 3, "out of memory\n");
a73aeb5f 136 }
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137}
138
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139/*
140=item llist_pop()
141
142Pop an item off the list, storing it at C<data> which must have enough room for an object of the size supplied to llist_new().
143
144returns 0 if the list is empty
145
146=cut
147*/
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148
149int
150llist_pop(struct llist *l,void *data) {
151 /* int ssize=l->ssize;
152 int multip=l->multip;*/
153 if (l->t == NULL) return 0;
154 l->t->fill--;
155 l->count--;
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156 memcpy(data,(char*)(l->t->data)+l->ssize*l->t->fill,l->ssize);
157
158 if (!l->t->fill) { /* This link empty */
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159 if (l->t->p == NULL) { /* and it's the only link */
160 llink_destroy(l->t);
161 l->h = l->t = NULL;
162 }
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163 else {
164 l->t=l->t->p;
165 llink_destroy(l->t->n);
166 }
167 }
168 return 1;
169}
170
171void
172llist_dump(struct llist *l) {
bc8930e3 173 int j;
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174 int i=0;
175 struct llink *lnk;
176 lnk=l->h;
177 while(lnk != NULL) {
178 for(j=0;j<lnk->fill;j++) {
179 /* memcpy(&k,(char*)(lnk->data)+l->ssize*j,sizeof(void*));*/
bc8930e3 180 /*memcpy(&k,(char*)(lnk->data)+l->ssize*j,sizeof(void*));*/
5e2762ac 181 printf("%d - %p\n",i,*(void **)((char *)(lnk->data)+l->ssize*j));
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182 i++;
183 }
184 lnk=lnk->n;
185 }
186}
187
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188/*
189=item llist_destroy()
190
191Destroy a linked-list based stack.
192
193=cut
194*/
195
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196void
197llist_destroy(struct llist *l) {
198 struct llink *t,*lnk = l->h;
199 while( lnk != NULL ) {
200 t=lnk;
201 lnk=lnk->n;
202 myfree(t);
203 }
204 myfree(l);
205}
206
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207/* Links */
208
209static struct llink *
210llink_new(struct llink* p,size_t size) {
211 struct llink *l;
212 l = mymalloc(sizeof(struct llink)); /* checked 4jul05 tonyc */
213 l->n = NULL;
214 l->p = p;
215 l->fill = 0;
216 l->data = mymalloc(size); /* checked 4jul05 tonyc - depends on caller to llist_push */
217 return l;
218}
219
220/* free's the data pointer, itself, and sets the previous' next pointer to null */
221
222static void
223llink_destroy(struct llink* l) {
224 if (l->p != NULL) { l->p->n=NULL; }
225 myfree(l->data);
226 myfree(l);
227}
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228
229
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230/* if it returns true there wasn't room for the
231 item on the link */
02d1d628 232
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233static int
234llist_llink_push(struct llist *lst, struct llink *lnk, const void *data) {
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235 /* fprintf(stderr,"llist_llink_push: data=0x%08X -> 0x%08X\n",data,*(int*)data);
236 fprintf(stderr,"ssize = %d, multip = %d, fill = %d\n",lst->ssize,lst->multip,lnk->fill); */
237 if (lnk->fill == lst->multip) return 1;
238 /* memcpy((char*)(lnk->data)+lnk->fill*lst->ssize,data,lst->ssize); */
239 memcpy((char*)(lnk->data)+lnk->fill*lst->ssize,data,lst->ssize);
240
241 /* printf("data=%X res=%X\n",*(int*)data,*(int*)(lnk->data));*/
242 lnk->fill++;
243 lst->count++;
244 return 0;
245}
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246
247/*
248 Oct-tree implementation
249*/
250
251struct octt *
252octt_new() {
253 int i;
254 struct octt *t;
255
f0960b14 256 t=(struct octt*)mymalloc(sizeof(struct octt)); /* checked 4jul05 tonyc */
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257 for(i=0;i<8;i++) t->t[i]=NULL;
258 t->cnt=0;
259 return t;
260}
261
262
263/* returns 1 if the colors wasn't in the octtree already */
264
265
266int
267octt_add(struct octt *ct,unsigned char r,unsigned char g,unsigned char b) {
268 struct octt *c;
269 int i,cm;
fe622da1 270 int ci;
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271 int rc;
272 rc=0;
273 c=ct;
274 /* printf("[r,g,b]=[%d,%d,%d]\n",r,g,b); */
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275 for(i=7;i>-1;i--) {
276 cm=1<<i;
277 ci=((!!(r&cm))<<2)+((!!(g&cm))<<1)+!!(b&cm);
278 /* printf("idx[%d]=%d\n",i,ci); */
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279 if (c->t[ci] == NULL) {
280 c->t[ci]=octt_new();
281 rc=1;
282 }
02d1d628 283 c=c->t[ci];
02d1d628 284 }
fe622da1 285 c->cnt++; /* New. The only thing really needed (I think) */
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286 return rc;
287}
288
289
290void
291octt_delete(struct octt *ct) {
292 int i;
293 for(i=0;i<8;i++) if (ct->t[i] != NULL) octt_delete(ct->t[i]); /* do not free instance here because it will free itself */
294 myfree(ct);
295}
296
297
298void
299octt_dump(struct octt *ct) {
300 int i;
301 /* printf("node [0x%08X] -> (%d)\n",ct,ct->cnt); */
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302 for(i=0;i<8;i++)
303 if (ct->t[i] != NULL)
304 printf("[ %d ] -> %p\n", i, (void *)ct->t[i]);
305 for(i=0;i<8;i++)
306 if (ct->t[i] != NULL)
307 octt_dump(ct->t[i]);
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308}
309
310/* note that all calls of octt_count are operating on the same overflow
311 variable so all calls will know at the same time if an overflow
312 has occured and stops there. */
313
314void
315octt_count(struct octt *ct,int *tot,int max,int *overflow) {
316 int i,c;
317 c=0;
318 if (!(*overflow)) return;
319 for(i=0;i<8;i++) if (ct->t[i]!=NULL) {
320 octt_count(ct->t[i],tot,max,overflow);
321 c++;
322 }
323 if (!c) (*tot)++;
324 if ( (*tot) > (*overflow) ) *overflow=0;
325}
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326
327/* This whole function is new */
328/* walk through the tree and for each colour, store its seen count in the
329 space pointed by *col_usage_it_adr */
330void
331octt_histo(struct octt *ct, unsigned int **col_usage_it_adr) {
332 int i,c;
333 c = 0;
334 for(i = 0; i < 8; i++)
335 if (ct->t[i] != NULL) {
336 octt_histo(ct->t[i], col_usage_it_adr);
337 c++;
338 }
339 if (!c) {
340 *(*col_usage_it_adr)++ = ct->cnt;
341 }
342}
343
344
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345i_img_dim
346i_abs(i_img_dim x) {
347 return x < 0 ? -x : x;
348}