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#include <stdlib.h>
#include <time.h>
#include "til.h"
#include "til_fb.h"
#include "til_settings.h"
#include "til_util.h"
#include "txt/txt.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 til_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, til_fb_fragment_t *fragment, til_fragmenter_t *res_fragmenter);
static int compose_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc);
static char *compose_default_layers[] = { "drizzle", "stars", "spiro", "plato", NULL };
static char **compose_layers;
til_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",
.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 til_module_t *module;
module = til_lookup_module(layers[i]);
ctxt->layers[i].module = module;
(void) til_module_create_context(module, ticks, &ctxt->layers[i].module_ctxt);
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++)
til_module_destroy_context(ctxt->layers[i].module, ctxt->layers[i].module_ctxt);
free(context);
}
static void compose_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, til_fb_fragment_t *fragment, til_fragmenter_t *res_fragmenter)
{
compose_context_t *ctxt = context;
til_fb_fragment_zero(fragment);
for (int i = 0; i < ctxt->n_layers; i++)
til_module_render(ctxt->layers[i].module, ctxt->layers[i].module_ctxt, ticks, fragment);
}
static int compose_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc)
{
const char *layers;
int r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Colon-separated list of module layers, in draw-order",
.key = "layers",
.preferred = "drizzle:stars:spiro:plato",
.annotations = NULL
},
&layers,
res_setting,
res_desc);
if (r)
return r;
/* turn layers colon-separated list into a null-terminated array of strings */
{
const til_module_t **modules;
size_t n_modules;
char *toklayers, *layer;
int n = 2;
til_get_modules(&modules, &n_modules);
toklayers = strdup(layers);
if (!toklayers)
return -ENOMEM;
layer = strtok(toklayers, ":");
if (!layer)
return -EINVAL;
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;
}
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