projects/image_viewer.cpp at main · marker-sss/projects · GitHub

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#include <iostream>
#include <fstream>
#include <SDL2/SDL.h>
#include <string>
using namespace std;

int main(int argc, char **argv)
{

	SDL_Init(SDL_INIT_EVERYTHING);
	int img_w, img_h, max, pixel_r, pixel_g, pixel_b;
	bool is_running;
	SDL_Event event;
	string identifier;
	ifstream fin;

	if(argc != 2)
	{
		cerr << "Usage: ./image-viewer file.ppm" << endl;
		return 1;
	}

	fin.open(argv[1]);

	if(fin.fail())
	{
		cerr << "Usage: ./image-viewer file.ppm" << endl;
		return 1;
	}

	fin >> identifier >> img_w >> img_h >> max;

	if(identifier != "P3")
	{
		cerr << "Ensure ppm is in P3 file format" << endl;
		return 1;
	}

	if(max != 255)
	{
		cerr << "Please only use files with max opacity of 255" << endl;
		return 1;
	}


	is_running = true;
	SDL_Window *window;
	SDL_Renderer *renderer;
	SDL_CreateWindowAndRenderer(img_w, img_h, 0, &window, &renderer);

	for(int i = 0; i < img_h; i++)
	{

		for(int j = 0; j < img_w; j++)
		{
			fin >> pixel_r >> pixel_g >> pixel_b;

			SDL_SetRenderDrawColor(renderer, pixel_r, pixel_g, pixel_b, SDL_ALPHA_OPAQUE);
			SDL_RenderDrawPoint(renderer, j, i);
		}
	}

	SDL_RenderPresent(renderer);

	while(is_running)
	{
		while(SDL_PollEvent(&event))
		{
			if(event.type == SDL_QUIT) is_running = false;
		}

}

	SDL_DestroyWindow(window);
	SDL_DestroyRenderer(renderer);
	SDL_Quit();
	return 0;

}