Terminal image viewer using Imlib2

term-img.cpp

#include <iostream>
#include <Imlib2.h>

int main(int argc, char **argv) {
	if(argc != 2) {
		fprintf(stderr, "%s: usage: <image>\n", argv[0]);
		return 1;
	}

	Imlib_Image img;
	img = imlib_load_image_immediately(argv[1]);

	if (!img) {
		fprintf(stderr, "%s: failed to open image\n", argv[0]);
		return 1;
	}

	imlib_context_set_image(img);

	int w = imlib_image_get_width(),
		h = imlib_image_get_height();

	uint32_t *pixels = imlib_image_get_data();

	auto set_color = [&](bool fg, uint32_t c) {
		uint8_t r = ((c >> 16) & 0xFF);
		uint8_t g = ((c >> 8) & 0xFF);
		uint8_t b = (c & 0xFF);
		printf("\x1B[%d;2;%d;%d;%dm", fg ? 38 : 48, r, g, b);
	};

	for (int y = 0; y < (h + 1) / 2; y++) {
		for (int x = 0; x < w; x++) {
			int py = y * 2;

			set_color(true, pixels[x + py * w]);
			if (py + 1 < h)
				set_color(false, pixels[x + (py + 1) * w]);
			printf("▀");
		}
		printf("\x1B[0m\n");
	}

	return 0;
}