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Grayscale color and rectangle drawing

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This commit is contained in:
Michał Gdula 2025-06-24 19:57:53 +01:00
parent 66b18495eb
commit 26c4d4f8a6
2 changed files with 98 additions and 26 deletions
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110
lib_sharp.c
View file

@ -17,6 +17,18 @@ uint8_t mirror_bytes(uint8_t byte)
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;
}
sharp_display_t sharp_display_new(uint16_t width, uint16_t height, spi_inst_t * spi, uint8_t cs)
{
gpio_put(cs, false);
@ -42,7 +54,7 @@ void sharp_display_refresh_screen(sharp_display_t * display)
{
uint8_t spi_byte;
gpio_put(display->cs, 1);
gpio_put(display->cs, true);
sharp_display_toggle_vcom(display);
uint16_t line_size = display->width / 8;
@ -72,12 +84,12 @@ void sharp_display_refresh_screen(sharp_display_t * display)
spi_byte = 0b00000000;
spi_write_blocking(display->spi, &spi_byte, 1);
gpio_put(display->cs, 0);
gpio_put(display->cs, false);
}
void sharp_display_clear_screen(sharp_display_t * display)
{
gpio_put(display->cs, 1);
gpio_put(display->cs, true);
sharp_display_toggle_vcom(display);
memset(display->framebuffer, 0b00000000, (display->width * display->height) / 8);
@ -87,7 +99,7 @@ void sharp_display_clear_screen(sharp_display_t * display)
buff[1] = 0b00000000;
spi_write_blocking(display->spi, buff, 2);
gpio_put(display->cs, 0);
gpio_put(display->cs, false);
}
void sharp_display_toggle_vcom(sharp_display_t * display)
@ -95,26 +107,80 @@ void sharp_display_toggle_vcom(sharp_display_t * display)
display->vcom ^= CMD_VCOM;
}
void sharp_display_draw_pixel(sharp_display_t *display, uint16_t x, uint16_t y, sharp_color_t color)
void sharp_display_set_buffer(sharp_display_t * display, sharp_color_t color)
{
if (x < 0 || x >= display->width || y < 0 || y >= display->height) return;
uint16_t pixel_in_byte = x % 8;
uint16_t column_in_bytes = (x - pixel_in_byte) / 8;
uint8_t mask = 0b000000001 << pixel_in_byte;
if (color == WHITE) {
display->framebuffer[y*(display->width / 8) + column_in_bytes] |= ~mask;
} else {
display->framebuffer[y*(display->width / 8) + column_in_bytes] &= ~mask;
}
}
void sharp_display_fill_screen(sharp_display_t * display, sharp_color_t color)
{
if (color == WHITE) {
switch (color) {
case WHITE:
memset(display->framebuffer, 0b11111111, (display->width * display->height) / 8);
} else {
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_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);
}
}
}

14
lib_sharp.h
View file

@ -10,8 +10,10 @@
typedef enum sharp_color
{
WHITE = 0,
BLACK = 1,
WHITE,
LIGHT_GRAY,
DARK_GRAY,
BLACK,
}
sharp_color_t;
@ -27,10 +29,14 @@ sharp_display_t;
sharp_display_t sharp_display_new(uint16_t width, uint16_t height, spi_inst_t * spi, uint8_t cs);
bool sharp_display_error(sharp_display_t * display);
void sharp_display_refresh_screen(sharp_display_t * display);
void sharp_display_clear_screen(sharp_display_t * display);
void sharp_display_toggle_vcom(sharp_display_t * display);
void sharp_display_draw_pixel(sharp_display_t *display, uint16_t x, uint16_t y, sharp_color_t color);
void sharp_display_fill_screen(sharp_display_t * display, sharp_color_t color);
void sharp_display_set_buffer(sharp_display_t * display, sharp_color_t color);
void sharp_display_draw_pixel(sharp_display_t * display, uint16_t x, uint16_t y, sharp_color_t color);
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);
#endif