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source: libpipi/trunk/pipi/context.c @ 3546
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Last change on this file since 3546 was 3546, checked in by Sam Hocevar, 12 years ago
Implement pipi_rotate(). Currently nearest-neighbour only, supersample if you need more precision.
File size: 19.2 KB

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1	/*
2	* libpipi Pathetic image processing interface library
3	* Copyright (c) 2004-2008 Sam Hocevar <sam@zoy.org>
4	* All Rights Reserved
5	*
6	* $Id$
7	*
8	* This library is free software. It comes without any warranty, to
9	* the extent permitted by applicable law. You can redistribute it
10	* and/or modify it under the terms of the Do What The Fuck You Want
11	* To Public License, Version 2, as published by Sam Hocevar. See
12	* http://sam.zoy.org/wtfpl/COPYING for more details.
13	*/
14
15	/*
16	* context.c: processing stack handling routines
17	*/
18
19	#include "config.h"
20
21	#include <stdio.h>
22	#include <stdlib.h>
23	#include <stdarg.h>
24	#include <string.h>
25
26	#include "pipi.h"
27	#include "pipi_internals.h"
28
29	pipi_context_t *pipi_create_context()
30	{
31	pipi_context_t *ret;
32
33	ret = malloc(sizeof(pipi_context_t));
34	memset(ret, 0, sizeof(pipi_context_t));
35
36	return ret;
37	}
38
39	void pipi_destroy_context(pipi_context_t *ctx)
40	{
41	free(ctx);
42	}
43
44	pipi_command_t const *pipi_get_command_list(void)
45	{
46	static pipi_command_t const list[] =
47	{
48	{ "load", 1 },
49	{ "save", 1 },
50
51	{ "dup", 0 },
52	{ "swap", 0 },
53	{ "roll", 1 },
54
55	{ "gamma", 1 },
56	{ "scale", 1 },
57	{ "crop", 1 },
58	{ "geometry", 1 },
59	{ "tile", 1 },
60	{ "dither", 1 },
61	{ "blur", 1 },
62	{ "boxblur", 1 },
63	{ "median", 1 },
64	{ "gray", 0 },
65	{ "brightness", 1 },
66	{ "contrast", 1 },
67	{ "autocontrast", 0 },
68	{ "order", 0 },
69	{ "hflip", 0 },
70	{ "vflip", 0 },
71	{ "rotate90", 0 },
72	{ "rotate180", 0 },
73	{ "rotate270", 0 },
74	{ "rotate", 1 },
75	{ "invert", 0 },
76	{ "threshold", 1 },
77	{ "dilate", 0 },
78	{ "erode", 0 },
79	{ "wrap", 0 },
80	{ "combine", 0 },
81	{ "split", 0 },
82	{ "mean", 0 },
83	{ "merge", 1 },
84	{ "min", 0 },
85	{ "max", 0 },
86	{ "add", 0 },
87	{ "sub", 0 },
88	{ "difference", 0 },
89	{ "multiply", 0 },
90	{ "divide", 0 },
91	{ "screen", 0 },
92	{ "overlay", 0 },
93	{ "line", 1 },
94	{ "sine", 1 },
95	{ "wave", 1 },
96
97	/* End marker */
98	{ NULL, 0 }
99	};
100
101	return list;
102	}
103
104	int pipi_command(pipi_context_t ctx, char const cmd, ...)
105	{
106	if(!strcmp(cmd, "load"))
107	{
108	char const *file;
109	va_list ap;
110
111	va_start(ap, cmd);
112	file = va_arg(ap, char const *);
113	va_end(ap);
114	ctx->images[ctx->nimages] = pipi_load(file);
115	if(ctx->images[ctx->nimages] == NULL)
116	return -1;
117	ctx->nimages++;
118	}
119	else if(!strcmp(cmd, "save"))
120	{
121	char const *file;
122	va_list ap;
123
124	if(ctx->nimages < 1)
125	return -1;
126	ctx->nimages--;
127	va_start(ap, cmd);
128	file = va_arg(ap, char const *);
129	va_end(ap);
130	pipi_save(ctx->images[ctx->nimages], file);
131	pipi_free(ctx->images[ctx->nimages]);
132	}
133	else if(!strcmp(cmd, "gamma"))
134	{
135	char const *val;
136	va_list ap;
137
138	va_start(ap, cmd);
139	val = va_arg(ap, char const *);
140	va_end(ap);
141
142	pipi_set_gamma(atof(val));
143	}
144	else if(!strcmp(cmd, "dither"))
145	{
146	pipi_image_t src, dst;
147	char const *method;
148	va_list ap;
149
150	if(ctx->nimages < 1)
151	return -1;
152	va_start(ap, cmd);
153	method = va_arg(ap, char const *);
154	va_end(ap);
155	src = ctx->images[ctx->nimages - 1];
156	dst = NULL;
157	if(!strcmp(method, "ost"))
158	dst = pipi_dither_ostromoukhov(src, 0);
159	else if(!strcmp(method, "sost"))
160	dst = pipi_dither_ostromoukhov(src, 1);
161	else if(!strcmp(method, "ediff"))
162	{
163	if(ctx->nimages < 2)
164	return -1;
165	dst = pipi_dither_ediff(ctx->images[ctx->nimages - 2], src, 0);
166	pipi_free(ctx->images[ctx->nimages - 2]);
167	ctx->nimages--;
168	}
169	else if(!strcmp(method, "sediff"))
170	{
171	if(ctx->nimages < 2)
172	return -1;
173	dst = pipi_dither_ediff(ctx->images[ctx->nimages - 2], src, 1);
174	pipi_free(ctx->images[ctx->nimages - 2]);
175	ctx->nimages--;
176	}
177	else if(!strncmp(method, "ordered", 7))
178	{
179	double scale = 1., angle = .0;
180	if(ctx->nimages < 2)
181	return -1;
182	method = strchr(method, ':');
183	if(method)
184	{
185	scale = atof(method + 1);
186	method = strchr(method + 1, ':');
187	if(method)
188	angle = atof(method + 1);
189	}
190	if(scale <= 0.)
191	scale = 1.;
192	dst = pipi_dither_ordered_ext(ctx->images[ctx->nimages - 2], src,
193	scale, angle);
194	pipi_free(ctx->images[ctx->nimages - 2]);
195	ctx->nimages--;
196	}
197	else if(!strncmp(method, "halftone", 8))
198	{
199	double r, angle = .0;
200	method = strchr(method, ':');
201	if(!method)
202	return -1;
203	r = atof(method + 1);
204	method = strchr(method + 1, ':');
205	if(method)
206	angle = atof(method + 1);
207	if(r < 1.)
208	r = 1.;
209	dst = pipi_dither_halftone(src, r, angle);
210	}
211	else if(!strcmp(method, "random"))
212	dst = pipi_dither_random(src);
213	else if(!strcmp(method, "dbs"))
214	dst = pipi_dither_dbs(src);
215	if(dst == NULL)
216	return -1;
217	pipi_free(src);
218	ctx->images[ctx->nimages - 1] = dst;
219	}
220	else if(!strcmp(cmd, "blur"))
221	{
222	pipi_image_t src, dst;
223	char const *arg;
224	va_list ap;
225	double w, h, a = 0.0;
226
227	if(ctx->nimages < 1)
228	return -1;
229	va_start(ap, cmd);
230	arg = va_arg(ap, char const *);
231	va_end(ap);
232	w = h = atof(arg);
233	arg = strchr(arg, 'x');
234	if(arg)
235	{
236	h = atof(arg + 1);
237	arg = strchr(arg, 'r');
238	if(arg)
239	a = atof(arg + 1);
240	}
241	src = ctx->images[ctx->nimages - 1];
242	dst = pipi_gaussian_blur_ext(src, w, h, a, 0.0, 0.0);
243	if(dst == NULL)
244	return -1;
245	pipi_free(src);
246	ctx->images[ctx->nimages - 1] = dst;
247	}
248	else if(!strcmp(cmd, "boxblur") \|\| !strcmp(cmd, "median"))
249	{
250	pipi_image_t src, dst = NULL;
251	char const *arg;
252	va_list ap;
253	double w, h;
254
255	if(ctx->nimages < 1)
256	return -1;
257	va_start(ap, cmd);
258	arg = va_arg(ap, char const *);
259	va_end(ap);
260	w = h = atof(arg);
261	arg = strchr(arg, 'x');
262	if(arg)
263	h = atof(arg + 1);
264	src = ctx->images[ctx->nimages - 1];
265	switch(cmd[0])
266	{
267	case 'b': dst = pipi_box_blur_ext(src, w, h); break;
268	case 'm': dst = pipi_median_ext(src, w, h); break;
269	}
270	if(dst == NULL)
271	return -1;
272	pipi_free(src);
273	ctx->images[ctx->nimages - 1] = dst;
274	}
275	else if(!strcmp(cmd, "geometry") \|\| !strcmp(cmd, "tile"))
276	{
277	pipi_image_t src, dst = NULL;
278	char const *arg;
279	va_list ap;
280	int w, h;
281
282	if(ctx->nimages < 1)
283	return -1;
284	va_start(ap, cmd);
285	arg = va_arg(ap, char const *);
286	va_end(ap);
287	w = atoi(arg);
288	arg = strchr(arg, 'x');
289	if(!arg)
290	return -1;
291	h = atoi(arg + 1);
292	if(w <= 0 \|\| h <= 0)
293	return -1;
294	src = ctx->images[ctx->nimages - 1];
295	switch(cmd[0])
296	{
297	case 'g': dst = pipi_resize(src, w, h); break;
298	case 't': dst = pipi_tile(src, w, h); break;
299	}
300	if(dst == NULL)
301	return -1;
302	pipi_free(src);
303	ctx->images[ctx->nimages - 1] = dst;
304	}
305	else if(!strcmp(cmd, "scale"))
306	{
307	pipi_image_t src, dst;
308	char const *arg;
309	va_list ap;
310	double scale;
311	int w, h;
312
313	if(ctx->nimages < 1)
314	return -1;
315	src = ctx->images[ctx->nimages - 1];
316	va_start(ap, cmd);
317	arg = va_arg(ap, char const *);
318	va_end(ap);
319	scale = atof(arg);
320	w = (int)(scale * src->w + 0.5);
321	h = (int)(scale * src->h + 0.5);
322	if(w <= 0 \|\| h <= 0)
323	return -1;
324	dst = pipi_resize(src, w, h);
325	if(dst == NULL)
326	return -1;
327	pipi_free(src);
328	ctx->images[ctx->nimages - 1] = dst;
329	}
330	else if(!strcmp(cmd, "crop"))
331	{
332	pipi_image_t *tmp;
333	char const *arg;
334	va_list ap;
335	int w, h, x = 0, y = 0;
336	int ret;
337
338	if(ctx->nimages < 1)
339	return -1;
340
341	va_start(ap, cmd);
342	arg = va_arg(ap, char const *);
343	va_end(ap);
344
345	ret = sscanf(arg, "%dx%d+%d+%d", &w, &h, &x, &y);
346	if(ret < 2)
347	return -1;
348
349	tmp = ctx->images[ctx->nimages - 1];
350	ctx->images[ctx->nimages - 1] = pipi_crop(tmp, w, h, x, y);
351	pipi_free(tmp);
352	}
353	else if(!strcmp(cmd, "brightness") \|\| !strcmp(cmd, "contrast")
354	\|\| !strcmp(cmd, "threshold") \|\| !strcmp(cmd, "rotate"))
355	{
356	pipi_image_t src, dst = NULL;
357	char const *arg;
358	va_list ap;
359	double val;
360
361	if(ctx->nimages < 1)
362	return -1;
363	va_start(ap, cmd);
364	arg = va_arg(ap, char const *);
365	va_end(ap);
366	val = atof(arg);
367	src = ctx->images[ctx->nimages - 1];
368	switch(cmd[0])
369	{
370	case 'b': dst = pipi_brightness(src, val); break;
371	case 'c': dst = pipi_contrast(src, val); break;
372	case 'r': dst = pipi_rotate(src, val); break;
373	case 't': dst = pipi_threshold(src, val); break;
374	}
375	if(dst == NULL)
376	return -1;
377	pipi_free(src);
378	ctx->images[ctx->nimages - 1] = dst;
379	}
380	else if(!strcmp(cmd, "hflip"))
381	{
382	pipi_image_t *tmp;
383	if(ctx->nimages < 1)
384	return -1;
385	tmp = ctx->images[ctx->nimages - 1];
386	ctx->images[ctx->nimages - 1] = pipi_hflip(tmp);
387	pipi_free(tmp);
388	}
389	else if(!strcmp(cmd, "vflip"))
390	{
391	pipi_image_t *tmp;
392	if(ctx->nimages < 1)
393	return -1;
394	tmp = ctx->images[ctx->nimages - 1];
395	ctx->images[ctx->nimages - 1] = pipi_vflip(tmp);
396	pipi_free(tmp);
397	}
398	else if(!strcmp(cmd, "rotate90"))
399	{
400	pipi_image_t *tmp;
401	if(ctx->nimages < 1)
402	return -1;
403	tmp = ctx->images[ctx->nimages - 1];
404	ctx->images[ctx->nimages - 1] = pipi_rotate90(tmp);
405	pipi_free(tmp);
406	}
407	else if(!strcmp(cmd, "rotate180"))
408	{
409	pipi_image_t *tmp;
410	if(ctx->nimages < 1)
411	return -1;
412	tmp = ctx->images[ctx->nimages - 1];
413	ctx->images[ctx->nimages - 1] = pipi_rotate180(tmp);
414	pipi_free(tmp);
415	}
416	else if(!strcmp(cmd, "rotate270"))
417	{
418	pipi_image_t *tmp;
419	if(ctx->nimages < 1)
420	return -1;
421	tmp = ctx->images[ctx->nimages - 1];
422	ctx->images[ctx->nimages - 1] = pipi_rotate270(tmp);
423	pipi_free(tmp);
424	}
425	else if(!strcmp(cmd, "order"))
426	{
427	pipi_image_t *tmp;
428	if(ctx->nimages < 1)
429	return -1;
430	tmp = ctx->images[ctx->nimages - 1];
431	ctx->images[ctx->nimages - 1] = pipi_order(tmp);
432	pipi_free(tmp);
433	}
434	else if(!strcmp(cmd, "split"))
435	{
436	pipi_image_t *src;
437
438	if(ctx->nimages < 1)
439	return -1;
440	src = ctx->images[ctx->nimages - 1];
441	ctx->nimages += 2;
442	ctx->images[ctx->nimages - 3] = pipi_red(src);
443	ctx->images[ctx->nimages - 2] = pipi_green(src);
444	ctx->images[ctx->nimages - 1] = pipi_blue(src);
445	pipi_free(src);
446	}
447	else if(!strcmp(cmd, "combine"))
448	{
449	pipi_image_t *dst;
450
451	if(ctx->nimages < 3)
452	return -1;
453	dst = pipi_rgb(ctx->images[ctx->nimages - 3],
454	ctx->images[ctx->nimages - 2],
455	ctx->images[ctx->nimages - 1]);
456	if(dst == NULL)
457	return -1;
458	pipi_free(ctx->images[ctx->nimages - 3]);
459	pipi_free(ctx->images[ctx->nimages - 2]);
460	pipi_free(ctx->images[ctx->nimages - 1]);
461	ctx->images[ctx->nimages - 3] = dst;
462	ctx->nimages -= 2;
463	}
464	else if(!strcmp(cmd, "merge"))
465	{
466	pipi_image_t *dst;
467	char const *arg;
468	va_list ap;
469	double val;
470
471	if(ctx->nimages < 2)
472	return -1;
473
474	va_start(ap, cmd);
475	arg = va_arg(ap, char const *);
476	va_end(ap);
477	val = atof(arg);
478
479	dst = pipi_merge(ctx->images[ctx->nimages - 2],
480	ctx->images[ctx->nimages - 1], val);
481	if(dst == NULL)
482	return -1;
483	pipi_free(ctx->images[ctx->nimages - 2]);
484	pipi_free(ctx->images[ctx->nimages - 1]);
485	ctx->images[ctx->nimages - 2] = dst;
486	ctx->nimages--;
487	}
488	else if(!strcmp(cmd, "mean") \|\| !strcmp(cmd, "min") \|\| !strcmp(cmd, "max")
489	\|\| !strcmp(cmd, "add") \|\| !strcmp(cmd, "sub")
490	\|\| !strcmp(cmd, "difference") \|\| !strcmp(cmd, "multiply")
491	\|\| !strcmp(cmd, "divide") \|\| !strcmp(cmd, "screen")
492	\|\| !strcmp(cmd, "overlay"))
493	{
494	pipi_image_t *dst = NULL;
495
496	if(ctx->nimages < 2)
497	return -1;
498	switch(cmd[2])
499	{
500	case 'a': dst = pipi_mean(ctx->images[ctx->nimages - 2],
501	ctx->images[ctx->nimages - 1]);
502	break;
503	case 'n': dst = pipi_min(ctx->images[ctx->nimages - 2],
504	ctx->images[ctx->nimages - 1]);
505	break;
506	case 'x': dst = pipi_max(ctx->images[ctx->nimages - 2],
507	ctx->images[ctx->nimages - 1]);
508	break;
509	case 'd': dst = pipi_add(ctx->images[ctx->nimages - 2],
510	ctx->images[ctx->nimages - 1]);
511	break;
512	case 'b': dst = pipi_sub(ctx->images[ctx->nimages - 2],
513	ctx->images[ctx->nimages - 1]);
514	break;
515	case 'f': dst = pipi_difference(ctx->images[ctx->nimages - 2],
516	ctx->images[ctx->nimages - 1]);
517	break;
518	case 'l': dst = pipi_multiply(ctx->images[ctx->nimages - 2],
519	ctx->images[ctx->nimages - 1]);
520	break;
521	case 'v': dst = pipi_divide(ctx->images[ctx->nimages - 2],
522	ctx->images[ctx->nimages - 1]);
523	break;
524	case 'r': dst = pipi_screen(ctx->images[ctx->nimages - 2],
525	ctx->images[ctx->nimages - 1]);
526	break;
527	case 'e': dst = pipi_overlay(ctx->images[ctx->nimages - 2],
528	ctx->images[ctx->nimages - 1]);
529	break;
530	}
531	if(dst == NULL)
532	return -1;
533	pipi_free(ctx->images[ctx->nimages - 2]);
534	pipi_free(ctx->images[ctx->nimages - 1]);
535	ctx->images[ctx->nimages - 2] = dst;
536	ctx->nimages--;
537	}
538	else if(!strcmp(cmd, "wrap"))
539	{
540	if(ctx->nimages < 1)
541	return -1;
542	ctx->images[ctx->nimages - 1]->wrap = 1;
543	}
544	else if(!strcmp(cmd, "autocontrast"))
545	{
546	pipi_image_t *tmp;
547	if(ctx->nimages < 1)
548	return -1;
549	tmp = ctx->images[ctx->nimages - 1];
550	ctx->images[ctx->nimages - 1] = pipi_autocontrast(tmp);
551	pipi_free(tmp);
552	}
553	else if(!strcmp(cmd, "invert"))
554	{
555	pipi_image_t *tmp;
556	if(ctx->nimages < 1)
557	return -1;
558	tmp = ctx->images[ctx->nimages - 1];
559	ctx->images[ctx->nimages - 1] = pipi_invert(tmp);
560	pipi_free(tmp);
561	}
562	else if(!strcmp(cmd, "dilate"))
563	{
564	pipi_image_t *tmp;
565	if(ctx->nimages < 1)
566	return -1;
567	tmp = ctx->images[ctx->nimages - 1];
568	ctx->images[ctx->nimages - 1] = pipi_dilate(tmp);
569	pipi_free(tmp);
570	}
571	else if(!strcmp(cmd, "erode"))
572	{
573	pipi_image_t *tmp;
574	if(ctx->nimages < 1)
575	return -1;
576	tmp = ctx->images[ctx->nimages - 1];
577	ctx->images[ctx->nimages - 1] = pipi_erode(tmp);
578	pipi_free(tmp);
579	}
580	else if(!strcmp(cmd, "gray"))
581	{
582	if(ctx->nimages < 1)
583	return -1;
584	pipi_get_pixels(ctx->images[ctx->nimages - 1], PIPI_PIXELS_Y_F32);
585	}
586	else if(!strcmp(cmd, "free"))
587	{
588	if(ctx->nimages < 1)
589	return -1;
590	ctx->nimages--;
591	pipi_free(ctx->images[ctx->nimages]);
592	}
593	else if(!strcmp(cmd, "dup"))
594	{
595	if(ctx->nimages < 1)
596	return -1;
597	ctx->images[ctx->nimages] = pipi_copy(ctx->images[ctx->nimages - 1]);
598	ctx->nimages++;
599	}
600	else if(!strcmp(cmd, "swap"))
601	{
602	pipi_image_t *tmp;
603	if(ctx->nimages < 2)
604	return -1;
605	tmp = ctx->images[ctx->nimages - 1];
606	ctx->images[ctx->nimages - 1] = ctx->images[ctx->nimages - 2];
607	ctx->images[ctx->nimages - 2] = tmp;
608	}
609	else if(!strcmp(cmd, "roll"))
610	{
611	pipi_image_t *tmp;
612	char const *arg;
613	va_list ap;
614	int val;
615
616	va_start(ap, cmd);
617	arg = va_arg(ap, char const *);
618	va_end(ap);
619	val = atoi(arg);
620	if(val <= 0 \|\| ctx->nimages < val)
621	return -1;
622	if(val == 1)
623	return 0;
624	tmp = ctx->images[ctx->nimages - val];
625	memmove(ctx->images + ctx->nimages - val,
626	ctx->images + ctx->nimages - val + 1,
627	(val - 1) * sizeof(*ctx->images));
628	ctx->images[ctx->nimages - 1] = tmp;
629	}
630	else if(!strcmp(cmd, "line"))
631	{
632	char const *arg;
633	va_list ap;
634	int x1, y1, x2, y2, aa = 0, ret;
635	uint32_t color = 0;
636
637	if(ctx->nimages < 1)
638	return -1;
639
640	va_start(ap, cmd);
641	arg = va_arg(ap, char const *);
642	va_end(ap);
643
644	ret = sscanf(arg, "%d,%d,%d,%d,%08x,%d",
645	&x1, &y1, &x2, &y2, &color, &aa);
646	if(ret < 5) return -1;
647
648	ctx->images[ctx->nimages] = pipi_copy(ctx->images[ctx->nimages - 1]);
649	pipi_draw_line(ctx->images[ctx->nimages],
650	x1, y1, x2, y2, color, aa);
651	ctx->nimages++;
652	}
653	else if(!strcmp(cmd, "sine") \|\| !strcmp(cmd, "wave"))
654	{
655	pipi_image_t src, dst = NULL;
656	char const *arg;
657	va_list ap;
658	float dw, dh, d = 0.0, a = 0.0;
659	int ret;
660
661	if(ctx->nimages < 1)
662	return -1;
663
664	va_start(ap, cmd);
665	arg = va_arg(ap, char const *);
666	va_end(ap);
667
668	ret = sscanf(arg, "%gx%g+%gr%g", &dw, &dh, &d, &a);
669	if(ret < 2)
670	return -1;
671
672	src = ctx->images[ctx->nimages - 1];
673	switch(cmd[0])
674	{
675	case 's': dst = pipi_sine(src, dw, dh, d, a); break;
676	case 'w': dst = pipi_wave(src, dw, dh, d, a); break;
677	}
678	if(dst == NULL)
679	return -1;
680	pipi_free(src);
681	ctx->images[ctx->nimages - 1] = dst;
682	}
683	else
684	{
685	return -1;
686	}
687
688	return 0;
689	}
690

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