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/*
* @file display_text.c
* A text-rendering/managing library to work with the display
*
* Copyright (C) 2018 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <clock.h>
#include <task.h>
#include <display_draw.h>
#include <heap.h>
#include <string.h>
#define WIDTH 40
#define HEIGHT 18
typedef struct {
char *buf;
uint8_t x;
uint8_t y;
} tty_t;
static tty_t text_tty[TTY_COUNT];
static tty_t *text_current;
static uint8_t text_cursor;
void task_cursor(void)
{
while (1) {
delay(300);
if (text_cursor == 0)
continue;
int x = text_current->x * C_WIDTH;
int y = text_current->y * C_HEIGHT;
dsp_rect(x, y + C_HEIGHT - 1, C_WIDTH, 1, 0xFFFF);
delay(300);
dsp_rect(x, y + C_HEIGHT - 1, C_WIDTH, 1, 0);
}
}
void text_init(void)
{
for (int i = 0; i < TTY_COUNT; i++) {
text_tty[i].buf = calloc(WIDTH * HEIGHT, sizeof(char));
text_tty[i].x = 0;
text_tty[i].y = 0;
}
text_current = &text_tty[0];
text_cursor = 1;
task_start(task_cursor, 512);
}
void text_redraw(void)
{
for (unsigned int j = 0; j < HEIGHT; j++) {
unsigned int i = WIDTH;
//for (; i > 0 && text_current->buf[j * WIDTH + i - 1] == '\0'; i--);
for (; i > 0; i--) {
int c = text_current->buf[j * WIDTH + i - 1];
dsp_putchar(c, i - 1, j);
}
}
}
void text_switch(unsigned int i)
{
if (i >= TTY_COUNT || text_current == text_tty + i)
return;
text_current = &text_tty[i];
text_redraw();
}
void text_clear(void)
{
for (unsigned int j = 0; j < HEIGHT; j++) {
for (unsigned int i = 0; i < WIDTH; i++) {
//int c = text_current->buf[j * WIDTH + 1];
//if (c != 0) {
text_current->buf[j * WIDTH + i] = 0;
dsp_putchar(' ', i, j);
//}
}
}
text_current->x = 0;
text_current->y = 0;
}
void text_putchar(int c)
{
uint8_t x = text_current->x;
uint8_t y = text_current->y;
switch (c) {
case '\n':
y++;
// fall_through
case '\r':
x = 0;
break;
case '\t':
for (unsigned int i = 0; i < 4; i++)
dsp_putchar(' ', x++, y);
break;
case '\b':
x--;
dsp_putchar(' ', x, y);
break;
default:
dsp_putchar(c, x, y);
text_current->buf[x + y * WIDTH] = c;
x++;
break;
}
if (x >= WIDTH) {
x = 0;
y++;
}
if (y >= HEIGHT) {
// clear
for (int i = 1; i < HEIGHT; i++) {
memcpy(text_current->buf + (i - 1) * WIDTH,
text_current->buf + i * WIDTH, WIDTH);
}
x = 0;
y = HEIGHT - 1;
for (int i = 0; i < WIDTH; i++)
text_current->buf[i + y * WIDTH] = 0;
for (int j = HEIGHT - 1; j >= 0; j--) {
int i = WIDTH - 1;
if (j > 0) {
for (; i >= 0; i--) {
int p = text_current->buf[(j - 1) * WIDTH + i];
int c = text_current->buf[j * WIDTH + i];
if (p != '\0' || c != '\0')
break;
}
}
for (; i >= 0; i--) {
int c = text_current->buf[j * WIDTH + i];
dsp_putchar(c, i, j);
}
}
}
text_current->x = x;
text_current->y = y;
}
void text_puts(const char *s)
{
unsigned int i = 0;
while (s[i])
text_putchar(s[i++]);
}
void text_setpos(uint8_t x, uint8_t y)
{
if (x >= WIDTH)
x = WIDTH - 1;
if (y >= HEIGHT)
y = HEIGHT - 1;
text_current->x = x;
text_current->y = y;
}
void text_relpos(int8_t x, int8_t y)
{
if ((int)(text_current->x + x) < 0)
text_current->x = 0;
else
text_current->x += x;
if ((int)(text_current->y + y) < 0)
text_current->y = 0;
else
text_current->y += y;
}
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