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/*
* tslib/plugins/invert.c
*
* Copyright 2017 Martin Kepplinger <martink@posteo.de>
*
* SPDX-License-Identifier: LGPL-2.1
*
*
* Simply inverts values in X and/or Y direction around given point
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <stdint.h>
#include "config.h"
#include "tslib.h"
#include "tslib-filter.h"
struct tslib_invert {
struct tslib_module_info module;
int32_t x0;
int32_t y0;
uint8_t invert_x;
uint8_t invert_y;
};
static int invert_read(struct tslib_module_info *info, struct ts_sample *samp, int nr)
{
struct tslib_invert *ctx = (struct tslib_invert *)info;
int count = 0;
while (count < nr) {
if (info->next->ops->read(info->next, samp, 1) < 1)
return count;
if (ctx->invert_x)
samp->x = ctx->x0 - samp->x;
if (ctx->invert_y)
samp->y = ctx->y0 - samp->y;
count++;
}
return count;
}
static int invert_read_mt(struct tslib_module_info *info,
struct ts_sample_mt **samp,
int max_slots, int nr)
{
struct tslib_invert *ctx = (struct tslib_invert *)info;
int ret;
int i, j;
if (!info->next->ops->read_mt)
return -ENOSYS;
ret = info->next->ops->read_mt(info->next, samp, max_slots, nr);
if (ret < 0)
return ret;
#ifdef DEBUG
if (ret == 0)
fprintf(stderr, "INVERT: couldn't read data\n");
printf("INVERT: read %d samples (mem: %d nr x %d slots)\n",
ret, nr, max_slots);
#endif
for (i = 0; i < ret; i++) {
for (j = 0; j < max_slots; j++) {
if (!(samp[i][j].valid & TSLIB_MT_VALID))
continue;
if (ctx->invert_x)
samp[i][j].x = ctx->x0 - samp[i][j].x;
if (ctx->invert_y)
samp[i][j].y = ctx->y0 - samp[i][j].y;
#ifdef DEBUG
printf("INVERT: new val slot %d: X %d Y %d\n",
j, samp[i][j].x, samp[i][j].y);
#endif
}
}
return ret;
}
static int invert_fini(struct tslib_module_info *info)
{
free(info);
return 0;
}
static const struct tslib_ops invert_ops = {
.read = invert_read,
.read_mt = invert_read_mt,
.fini = invert_fini,
};
static int invert_opt(struct tslib_module_info *inf, char *str, void *data)
{
struct tslib_invert *ctx = (struct tslib_invert *)inf;
long v;
int32_t err = errno;
v = strtol(str, NULL, 0);
if (v == LONG_MAX && errno == ERANGE)
return -1;
errno = err;
switch ((int)(intptr_t)data) {
case 1:
ctx->invert_x = 1;
ctx->x0 = v;
break;
case 2:
ctx->invert_y = 1;
ctx->y0 = v;
break;
default:
return -1;
}
return 0;
}
static const struct tslib_vars invert_vars[] = {
{ "x0", (void *)1, invert_opt },
{ "y0", (void *)2, invert_opt },
};
#define NR_VARS (sizeof(invert_vars) / sizeof(invert_vars[0]))
TSAPI struct tslib_module_info *invert_mod_init(__attribute__ ((unused)) struct tsdev *dev,
const char *params)
{
struct tslib_invert *ctx;
ctx = malloc(sizeof(struct tslib_invert));
if (ctx == NULL)
return NULL;
memset(ctx, 0, sizeof(*ctx));
ctx->module.ops = &invert_ops;
ctx->invert_x = 0;
ctx->invert_y = 0;
if (tslib_parse_vars(&ctx->module, invert_vars, NR_VARS, params)) {
free(ctx);
return NULL;
}
return &ctx->module;
}
#ifndef TSLIB_STATIC_INVERT_MODULE
TSLIB_MODULE_INIT(invert_mod_init);
#endif
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