LibSharp/lib_sharp.c
Fluffy-Bean 79a34396e7 Lines!
And fix white pixel drawing
2025-06-25 20:54:25 +01:00

287 lines
6.4 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hardware/gpio.h"
#include "hardware/spi.h"
#include "sharp_display.h"
uint8_t mirror_bytes(uint8_t byte)
{
uint8_t res = 0;
for (uint8_t x = 0; x < 8; x += 1) {
res = (res << 1) | (byte & 1);
byte >>= 1;
}
return res;
}
void swap_uint16(uint16_t *a, uint16_t *b)
{
uint16_t t = *a;
*a = *b;
*b = t;
}
uint16_t min_uint16(uint16_t a, uint16_t b)
{
return a < b ? a : b;
}
void swap_int16(int16_t *a, int16_t *b)
{
int16_t t = *a;
*a = *b;
*b = t;
}
sharp_display_t sharp_display_new(uint16_t width, uint16_t height, spi_inst_t * spi, uint8_t cs)
{
gpio_put(cs, false);
sharp_display_t display = {
.width = width,
.height = height,
.cs = cs,
.vcom = CMD_VCOM,
.framebuffer = (uint8_t *)malloc((width * height) / 8),
.spi = (spi)
};
return display;
}
bool sharp_display_error(sharp_display_t * display)
{
return display == NULL || display->framebuffer == NULL;
}
void sharp_display_refresh_screen(sharp_display_t * display)
{
uint8_t spi_byte;
gpio_put(display->cs, true);
sharp_display_toggle_vcom(display);
uint16_t line_size = display->width / 8;
spi_byte = display->vcom | CMD_WRITE;
spi_write_blocking(display->spi, &spi_byte, 1);
for (size_t i = 0; i < display->height; i += 1)
{
// Current line
spi_byte = mirror_bytes(i + 1);
spi_write_blocking(display->spi, &spi_byte, 1);
// Line data
for (size_t j = 0; j < line_size; j += 1)
{
spi_byte = mirror_bytes(display->framebuffer[(line_size * i) + j]);
spi_write_blocking(display->spi, &spi_byte, 1);
}
// End of line
spi_byte = 0b00000000;
spi_write_blocking(display->spi, &spi_byte, 1);
}
// End of transmission
spi_byte = 0b00000000;
spi_write_blocking(display->spi, &spi_byte, 1);
gpio_put(display->cs, false);
}
void sharp_display_clear_screen(sharp_display_t * display)
{
gpio_put(display->cs, true);
sharp_display_toggle_vcom(display);
memset(display->framebuffer, 0b00000000, (display->width * display->height) / 8);
uint8_t buff[2];
buff[0] = display->vcom | CMD_CLEAR;
buff[1] = 0b00000000;
spi_write_blocking(display->spi, buff, 2);
gpio_put(display->cs, false);
}
void sharp_display_toggle_vcom(sharp_display_t * display)
{
display->vcom ^= CMD_VCOM;
}
void sharp_display_set_buffer(sharp_display_t * display, sharp_color_t color)
{
switch (color) {
case WHITE:
memset(display->framebuffer, 0b11111111, (display->width * display->height) / 8);
break;
case LIGHT_GRAY:
case DARK_GRAY:
for (size_t x = 0; x < display->width; x += 1)
{
for (size_t y = 0; y < display->height; y += 1)
{
sharp_display_draw_pixel(display, x, y, color);
}
}
break;
case BLACK:
memset(display->framebuffer, 0b00000000, (display->width * display->height) / 8);
break;
}
}
void sharp_display_draw_pixel(sharp_display_t * display, uint16_t x, uint16_t y, sharp_color_t color)
{
if (x < 0 || x >= display->width || y < 0 || y >= display->height)
{
return;
}
uint8_t byte = x % 8;
uint16_t row = y * (display->width / 8);
uint16_t col = (x - byte) / 8;
uint8_t mask = 0b000000001 << byte;
switch (color) {
case WHITE:
display->framebuffer[row + col] |= mask;
break;
case LIGHT_GRAY:
if (x % 3 || y % 3)
{
display->framebuffer[row + col] |= mask;
}
else
{
display->framebuffer[row + col] &= ~mask;
}
break;
case DARK_GRAY:
if (x % 2)
{
display->framebuffer[row + col] |= mask;
}
else
{
display->framebuffer[row + col] &= ~mask;
}
break;
case BLACK:
display->framebuffer[row + col] &= ~mask;
break;
}
}
void sharp_display_draw_line(sharp_display_t * display, int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color)
{
// Vertical
if (x0 == x1)
{
if (y0 > y1)
{
swap_int16(&y0, &y1);
}
for (; y0 < y1; y0 += 1)
{
sharp_display_draw_pixel(display, x0, y0, color);
}
return;
}
// Horizontal
if (y0 == y1)
{
if (x0 > x1)
{
swap_int16(&x0, &x1);
}
for (; x0 < x1; x0 += 1)
{
sharp_display_draw_pixel(display, x0, y0, color);
}
return;
}
// Bresenham
int16_t dx = x1 - x0;
if (dx < 0)
{
dx = -dx;
}
int16_t dy = y1 - y0;
if (dy < 0)
{
dy = -dy;
}
int16_t steep = dy > dx;
if (steep) {
swap_int16(&x0, &y0);
swap_int16(&x1, &y1);
}
if (x0 > x1) {
swap_int16(&x0, &x1);
swap_int16(&y0, &y1);
}
dx = x1 - x0;
dy = y1 - y0;
int16_t ystep = 1;
if (dy < 0) {
dy = -dy;
ystep = -1;
}
int16_t err = dx / 2;
for (; x0 <= x1; x0 += 1) {
if (steep) {
sharp_display_draw_pixel(display, y0, x0, color);
} else {
sharp_display_draw_pixel(display, x0, y0, color);
}
err -= dy;
if (err < 0) {
y0 += ystep;
err += dx;
}
}
}
void sharp_display_draw_rectangle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color)
{
w = min_uint16(w, display->width);
h = min_uint16(h, display->height);
sharp_display_draw_line(display, x, y, x + w, y, color); // Top
sharp_display_draw_line(display, x, y + h, x + w, y + h, color); // Bottom
sharp_display_draw_line(display, x, y, x, y + h, color); // Left
sharp_display_draw_line(display, x + w, y, x + w, y + h, color); // Right
}
void sharp_display_draw_filled_rectangle(sharp_display_t * display, uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color)
{
w = min_uint16(w, display->width);
h = min_uint16(h, display->height);
for (uint16_t i = 0; i < h; i += 1)
{
for (uint16_t j = 0; j < w; j += 1)
{
sharp_display_draw_pixel(display, x + j, y + i, color);
}
}
}