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#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "til.h"
#include "til_fb.h"
/* Copyright (C) 2017-2022 Vito Caputo <vcaputo@pengaru.com> */
#define BLINDS_DEFAULT_COUNT 16
#define BLINDS_DEFAULT_ORIENTATION BLINDS_ORIENTATION_HORIZONTAL
typedef enum blinds_orientation_t {
BLINDS_ORIENTATION_HORIZONTAL,
BLINDS_ORIENTATION_VERTICAL,
} blinds_orientation_t;
typedef struct blinds_setup_t {
til_setup_t til_setup;
unsigned count;
blinds_orientation_t orientation;
} blinds_setup_t;
typedef struct blinds_context_t {
blinds_setup_t setup;
} blinds_context_t;
static blinds_setup_t blinds_default_setup = {
.count = BLINDS_DEFAULT_COUNT,
.orientation = BLINDS_DEFAULT_ORIENTATION,
};
static void * blinds_create_context(unsigned ticks, unsigned num_cpus, til_setup_t *setup)
{
blinds_context_t *ctxt;
if (!setup)
setup = &blinds_default_setup.til_setup;
ctxt = calloc(1, sizeof(blinds_context_t));
if (!ctxt)
return NULL;
ctxt->setup = *(blinds_setup_t *)setup;
return ctxt;
}
static void blinds_destroy_context(void *context)
{
blinds_context_t *ctxt = context;
free(ctxt);
}
/* draw a horizontal blind over fragment */
static inline void draw_blind_horizontal(til_fb_fragment_t *fragment, unsigned row, unsigned count, float t)
{
unsigned row_height = fragment->frame_height / count;
unsigned height = roundf(t * (float)row_height);
for (unsigned y = 0; y < height; y++)
memset(fragment->buf + ((row * row_height) + y ) * fragment->pitch, 0xff, fragment->width * 4);
}
/* draw a vertical blind over fragment */
static inline void draw_blind_vertical(til_fb_fragment_t *fragment, unsigned column, unsigned count, float t)
{
unsigned column_width = fragment->frame_width / count;
unsigned width = roundf(t * (float)column_width);
for (unsigned y = 0; y < fragment->height; y++)
memset(fragment->buf + y * fragment->pitch + column * column_width, 0xff, width * 4);
}
/* draw blinds over the fragment */
static void blinds_render_fragment(void *context, unsigned ticks, unsigned cpu, til_fb_fragment_t *fragment)
{
blinds_context_t *ctxt = context;
static float rr;
unsigned blind;
float r;
til_fb_fragment_clear(fragment);
for (r = rr, blind = 0; blind < ctxt->setup.count; blind++, r += .1) {
switch (ctxt->setup.orientation) {
case BLINDS_ORIENTATION_HORIZONTAL:
draw_blind_horizontal(fragment, blind, ctxt->setup.count, 1.f - fabsf(cosf(r)));
break;
case BLINDS_ORIENTATION_VERTICAL:
draw_blind_vertical(fragment, blind, ctxt->setup.count, 1.f - fabsf(cosf(r)));
break;
}
}
rr += .01;
}
static int blinds_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
const char *orientation;
const char *count;
const char *orientation_values[] = {
"horizontal",
"vertical",
NULL
};
const char *count_values[] = {
"2",
"4",
"8",
"12",
"16",
"24",
"32",
NULL
};
int r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Blinds orientation",
.key = "orientation",
.regex = "^(horizontal|vertical)",
.preferred = orientation_values[BLINDS_DEFAULT_ORIENTATION],
.values = orientation_values,
.annotations = NULL
},
&orientation,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Blinds count",
.key = "count",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(BLINDS_DEFAULT_COUNT),
.values = count_values,
.annotations = NULL
},
&count,
res_setting,
res_desc);
if (r)
return r;
if (res_setup) {
blinds_setup_t *setup;
setup = til_setup_new(sizeof(*setup), (void(*)(til_setup_t *))free);
if (!setup)
return -ENOMEM;
sscanf(count, "%u", &setup->count);
if (!strcasecmp(orientation, "horizontal")) {
setup->orientation = BLINDS_ORIENTATION_HORIZONTAL;
} else if (!strcasecmp(orientation, "vertical")) {
setup->orientation = BLINDS_ORIENTATION_VERTICAL;
} else {
til_setup_free(&setup->til_setup);
return -EINVAL;
}
*res_setup = &setup->til_setup;
}
return 0;
}
til_module_t blinds_module = {
.create_context = blinds_create_context,
.destroy_context = blinds_destroy_context,
.render_fragment = blinds_render_fragment,
.setup = blinds_setup,
.name = "blinds",
.description = "Retro 80s-inspired window blinds",
.author = "Vito Caputo <vcaputo@pengaru.com>",
.flags = TIL_MODULE_OVERLAYABLE,
};
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