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#define FBGL_IMPLEMENTATION
#include "fbgl.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h> // for usleep
#include <stdint.h>
#include <string.h>
// Function to save framebuffer as PPM image
int save_framebuffer_as_ppm(fbgl_t *fb, const char *filename)
{
FILE *fp = fopen(filename, "wb");
if (!fp) {
perror("Error opening file");
return -1;
}
// Write PPM header (P6 format - binary RGB)
fprintf(fp, "P6\n%zu %zu\n255\n", fb->width, fb->height);
// Allocate buffer for pixel data
uint8_t *pixel_buffer = malloc(fb->width * fb->height * 3);
if (!pixel_buffer) {
perror("Memory allocation error");
fclose(fp);
return -1;
}
// Convert framebuffer to RGB
for (size_t y = 0; y < fb->height; y++) {
for (size_t x = 0; x < fb->width; x++) {
uint32_t pixel = fb->pixels[y * fb->width + x];
// Extract RGB components (assuming 32-bit ARGB or RGB)
uint8_t r = (pixel >> 16) & 0xFF;
uint8_t g = (pixel >> 8) & 0xFF;
uint8_t b = pixel & 0xFF;
// Store in buffer for PPM
pixel_buffer[(y * fb->width + x) * 3] = r;
pixel_buffer[(y * fb->width + x) * 3 + 1] = g;
pixel_buffer[(y * fb->width + x) * 3 + 2] = b;
}
}
// Write pixel data
fwrite(pixel_buffer, 1, fb->width * fb->height * 3, fp);
// Cleanup
free(pixel_buffer);
fclose(fp);
return 0;
}
int main(int argc, char *argv[])
{
if (argc < 2) {
fprintf(stderr, "Usage: %s <font_file> [output_image]\n",
argv[0]);
return 1;
}
fbgl_t fb;
fbgl_init("/dev/fb0", &fb);
fbgl_set_bg(&fb, 0xFFFFFF);
// Load font
fbgl_psf1_font_t *font = fbgl_load_psf1_font(argv[1]);
if (!font) {
fprintf(stderr, "Failed to load font\n");
fbgl_destroy(&fb);
return 1;
}
// Text to render
const char *text = "Hello, fbgl!";
// Calculate text width
size_t text_width = strlen(text) * 8;
// Calculate centered position
int x = (fb.width - 8) / 2;
int y = (fb.height - 16) / 2;
// Render centered text
fbgl_render_psf1_text(&fb, font, text, x, y, 0xFF0000);
// Save screenshot
const char *output_filename = (argc > 2) ? argv[2] :
"fbgl_screenshot.ppm";
if (save_framebuffer_as_ppm(&fb, output_filename) == 0) {
// printf("Screenshot saved as %s\n", output_filename);
}
// Wait for a bit to show the image
size_t framerate = 30 * 30;
for (size_t i = 0; i < framerate; i++) {
usleep(50000);
}
// Cleanup
fbgl_destroy_psf1_font(font);
fbgl_destroy(&fb);
return 0;
}
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