drath/esp-gfx
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draws bmps now

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Drath Vader
2026-08-07 23:11:50 +02:00
parent 46a9e101f2
commit 5f63962f31
3 changed files with 20 additions and 2 deletions
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2
README.md
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@@ -23,4 +23,4 @@ gfx_draw_string(&canvas, font, 0, 16, "Hello", false);
st7567_update_screen(canvas.ctx);
```
Would be good to add a functionality to draw some bitmaps and some included default fonts. Cozette, Spleen, Terminus, those tiny ones from JP guy
Some included default fonts. Cozette, Spleen, Terminus

13
esp-gfx/gfx.c
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@@ -1,6 +1,6 @@
#include "gfx.h"
#include <stdbool.h>
#include <esp_log.h>
void gfx_draw_char(const gfx_canvas_t *canvas, const GFXfont *f, const bool inverted, const int16_t x, const int16_t y, const char c) {
void (*draw_cb)(void* ctx, uint8_t x, uint8_t y) = inverted ? canvas->clear_pixel_callback : canvas->draw_pixel_callback;
@@ -90,3 +90,14 @@ void gfx_fill_box(const gfx_canvas_t *canvas, const uint8_t pos_x, const uint8_t
for (uint8_t y = pos_y; y < pos_y + size_y; y++)
draw_cb(canvas->ctx, x, y);
}
void gfx_draw_bitmap(const gfx_canvas_t *canvas, const uint8_t pos_x, const uint8_t pos_y, const gfx_bitmap_t bmp, const bool inverted) {
void (*draw_cb)(void* ctx, uint8_t x, uint8_t y) = inverted ? canvas->clear_pixel_callback : canvas->draw_pixel_callback;
for (uint16_t i = 0; i < (uint16_t)(bmp.height * bmp.width / 8); i++) {
const uint8_t x = (i * 8) % bmp.width;
const uint8_t y = i / (bmp.width / 8);
for (uint8_t j = 0; j < 8; j++)
if (bmp.data[i] & (1 << j))
draw_cb(canvas->ctx, pos_x + x + j, pos_y + y);
}
}

7
esp-gfx/gfx.h
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@@ -21,6 +21,12 @@ typedef struct {
uint8_t yAdvance;
} GFXfont;
typedef struct {
uint8_t* data;
uint8_t width;
uint8_t height;
} gfx_bitmap_t;
/**
* @brief Canvas struct for the gfx library
* Functions take the context and x,y coordinates of a pixel
@@ -41,3 +47,4 @@ int16_t gfx_draw_string_centered(const gfx_canvas_t *canvas, const GFXfont *f, i
void gfx_draw_line(const gfx_canvas_t *canvas, uint8_t start_x, uint8_t start_y, uint8_t end_x, uint8_t end_y, bool inverted);
void gfx_draw_box(const gfx_canvas_t *canvas, uint8_t pos_x, uint8_t pos_y, uint8_t size_x, uint8_t size_y, bool inverted);
void gfx_fill_box(const gfx_canvas_t *canvas, uint8_t pos_x, uint8_t pos_y, uint8_t size_x, uint8_t size_y, bool inverted);
void gfx_draw_bitmap(const gfx_canvas_t *canvas, uint8_t pos_x, uint8_t pos_y, gfx_bitmap_t bmp, bool inverted);