summaryrefslogtreecommitdiff
path: root/src/modules/compose/compose.c
blob: 3bee6de1f3a2df53a54b75686bd950c92c64fb51 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
#include <stdlib.h>
#include <time.h>

#include "fb.h"
#include "rototiller.h"
#include "settings.h"
#include "txt/txt.h"
#include "util.h"

/* Copyright (C) 2020 - Vito Caputo <vcaputo@pengaru.com> */

/* This implements a rudimentary compositing module for layering
 * the output from other modules into a single frame.
 */

/* some TODOs:
 * - support randomizing settings and context resets, configurable
 * - maybe add a way for the user to supply the settings on the cli
 *   for the composed layers.  That might actually need to be a more
 *   general solution in the top-level rototiller code, since the
 *   other meta modules like montage and rtv could probably benefit
 *   from the ability to feed in settings to the underlying modules.
 */

typedef struct compose_layer_t {
	const rototiller_module_t	*module;
	void				*module_ctxt;
	char				*settings;
} compose_layer_t;

typedef struct compose_context_t {
	unsigned			n_cpus;

	size_t				n_layers;
	compose_layer_t			layers[];
} compose_context_t;

static void * compose_create_context(unsigned ticks, unsigned num_cpus);
static void compose_destroy_context(void *context);
static void compose_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, fb_fragment_t *fragment, rototiller_fragmenter_t *res_fragmenter);
static int compose_setup(const settings_t *settings, setting_desc_t **next_setting);

static char	*compose_default_layers[] = { "drizzle", "stars", "spiro", "plato", NULL };
static char	**compose_layers;


rototiller_module_t	compose_module = {
	.create_context = compose_create_context,
	.destroy_context = compose_destroy_context,
	.prepare_frame = compose_prepare_frame,
	.name = "compose",
	.description = "Layered Modules Compositor",
	.author = "Vito Caputo <vcaputo@pengaru.com>",
	.license = "GPLv2",
	.setup = compose_setup,
};


static void * compose_create_context(unsigned ticks, unsigned num_cpus)
{
	char			**layers = compose_default_layers;
	compose_context_t	*ctxt;
	int			n;

	if (compose_layers)
		layers = compose_layers;

	for (n = 0; layers[n]; n++);

	ctxt = calloc(1, sizeof(compose_context_t) + n * sizeof(compose_layer_t));
	if (!ctxt)
		return NULL;

	ctxt->n_cpus = num_cpus;

	for (int i = 0; i < n; i++) {
		const rototiller_module_t	*module;

		module = rototiller_lookup_module(layers[i]);

		ctxt->layers[i].module = module;
		if (module->create_context)
			ctxt->layers[i].module_ctxt = module->create_context(ticks, num_cpus);

		ctxt->n_layers++;
	}

	return ctxt;
}


static void compose_destroy_context(void *context)
{
	compose_context_t	*ctxt = context;

	for (int i = 0; i < ctxt->n_layers; i++) {
		if (ctxt->layers[i].module_ctxt)
			ctxt->layers[i].module->destroy_context(ctxt->layers[i].module_ctxt);
	}
	free(context);
}


static void compose_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, fb_fragment_t *fragment, rototiller_fragmenter_t *res_fragmenter)
{
	compose_context_t	*ctxt = context;

	fb_fragment_zero(fragment);

	for (int i = 0; i < ctxt->n_layers; i++)
		rototiller_module_render(ctxt->layers[i].module, ctxt->layers[i].module_ctxt, ticks, fragment);
}


static int compose_setup(const settings_t *settings, setting_desc_t **next_setting)
{
	const char	*layers;

	layers = settings_get_value(settings, "layers");
	if (!layers) {
		int	r;

		r = setting_desc_clone(&(setting_desc_t){
						.name = "Colon-Separated List Of Module Layers, In Draw Order",
						.key = "layers",
						.preferred = "drizzle:stars:spiro:plato",
						.annotations = NULL
					}, next_setting);
		if (r < 0)
			return r;

		return 1;
	}

	/* turn layers colon-separated list into a null-terminated array of strings */
	{
		const rototiller_module_t	**modules;
		size_t				n_modules;
		char				*toklayers, *layer;
		int				n = 2;

		rototiller_get_modules(&modules, &n_modules);

		toklayers = strdup(layers);
		if (!toklayers)
			return -ENOMEM;

		layer = strtok(toklayers, ":");
		do {
			char	**new;
			size_t	i;

			/* other meta-modules like montage and rtv may need to
			 * have some consideration here, but for now I'm just
			 * going to let the user potentially compose with montage
			 * or rtv as one of the layers.
			 */
			if (!strcmp(layer, "compose")) /* XXX: prevent infinite recursion */
				return -EINVAL;

			for (i = 0; i < n_modules; i++) {
				if (!strcmp(layer, modules[i]->name))
					break;
			}

			if (i >= n_modules)
				return -EINVAL;

			new = realloc(compose_layers, n * sizeof(*compose_layers));
			if (!new)
				return -ENOMEM;

			new[n - 2] = layer;
			new[n - 1] = NULL;
			n++;

			compose_layers = new;
		} while (layer = strtok(NULL, ":"));
	}

	return 0;
}
© All Rights Reserved