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/**
* @file display_draw.c
* Provides functions for drawing to 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 <display_draw.h>
#include <display.h>
#include <flash.h>
#include <heap.h>
#include <task.h>
#include <clock.h>
volatile uint8_t lock = 0;
#define LOCK while (lock) { delay(5); } task_hold(1); lock = 1
#define UNLOCK task_hold(0); lock = 0
static unsigned char *font;
void dsp_cursoron(void)
{
font = malloc(32 * 256);
flash_read((char *)font, 0, 32 * 256);
}
void dsp_putchar(int c, unsigned int xpos, unsigned int ypos)
{
LOCK;
/*if (c == '\n') {
curx = 0;
if (++cury == S_HEIGHT) {
UNLOCK;
dsp_rect(0, 0, C_WIDTH * S_WIDTH, C_HEIGHT * S_HEIGHT, 0);
cury = 0;
}
UNLOCK;
return;
} else if (c == '\b') {
if (curx > 0)
curx--;
UNLOCK;
dsp_rect(curxo + curx * C_WIDTH, curyo + cury * C_HEIGHT,
C_WIDTH, C_HEIGHT, 0);
return;
}*/
unsigned int x = xpos * C_WIDTH;
unsigned int y = ypos * C_HEIGHT;
dsp_set_addr(x, y, x + C_WIDTH - 1, y + C_HEIGHT - 1);
uint32_t base = c * 32;
for (unsigned int j = 0; j < 16; j++) {
uint16_t row = (font[base + j * 2] << 8) | font[base + j * 2 + 1];
for (int i = 4; i < 16; i++) {
uint8_t color = (row & (1 << i)) ? 0xFF : 0;
dsp_write_data(color);
dsp_write_data(color);
}
}
/*if (++curx == S_WIDTH) {
curx = 0;
if (++cury == S_HEIGHT) {
UNLOCK;
dsp_rect(0, 0, LCD_WIDTH, LCD_HEIGHT, 0);
LOCK;
cury = 0;
}
}*/
UNLOCK;
}
//
// Drawing functions
//
void dsp_rect(int x, int y, int w, int h, uint16_t color)
{
dsp_set_addr(x, y, x + w - 1, y + h - 1);
int countdown = w * h;
LOCK;
do {
dsp_write_data(color >> 8);
dsp_write_data(color & 0xFF);
} while (countdown--);
UNLOCK;
}
void dsp_pixel(int x, int y, uint16_t color)
{
LOCK;
dsp_set_addr(x, y, x, y);
dsp_write_data(color >> 8);
dsp_write_data(color & 0xFF);
UNLOCK;
}
void dsp_line(int x, int y, int i, int j, uint16_t color)
{
int dx = i - x;
int sx = dx >= 0 ? 1 : -1;
int dy = j - y;
int sy = dy >= 0 ? 1 : -1;
if (dx < 0)
dx *= -1;
if (dy < 0)
dy *= -1;
int err = (dx > dy ? dx : -dy) / 2;
int e2;
while (1) {
dsp_pixel(x, y, color);
if (x == i && y == j)
break;
e2 = err;
if (e2 > -dx) {
err -= dy;
x += sx;
}
if (e2 < dy) {
err += dx;
y += sy;
}
}
}
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