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Created attachment 4154 [details]
Image of bug

I would expect the following C code to fill in a window with red pixels, instead it seems like it skips a byte at the end of each row (see image) thus creating an ugly pattern.

void main(){
	int width = 14;
	int height = 16;

	int pitch = width*3;
	uint8_t *pixels;

	if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
		fprintf(stderr, "SDL_Init Error: %s\n", SDL_GetError());
		return EXIT_FAILURE;
	}

	SDL_Window * window = SDL_CreateWindow(
		"Illustration",
		SDL_WINDOWPOS_UNDEFINED, 
		SDL_WINDOWPOS_UNDEFINED, 
		width*10, 
		height*10, 
		SDL_WINDOW_RESIZABLE
	);

	SDL_Renderer * renderer;
	renderer = SDL_CreateRenderer(
		window,
		-1,
		SDL_RENDERER_ACCELERATED
	);

	SDL_Texture * buffer = SDL_CreateTexture(
		renderer,
		SDL_PIXELFORMAT_RGB24, // char red, char blue, char green
		SDL_TEXTUREACCESS_STREAMING, 
		width, height
	);

	for (int i = 0; i < width*height; ++i)	
	{
		SDL_LockTexture (buffer, NULL, (void **) &pixels, &pitch);

		int index = i*3;
		pixels[index]   = 255; // red
		pixels[index+1] = 0;   // green
		pixels[index+2] = 0;   // blue

		SDL_UnlockTexture(buffer);	
		SDL_RenderCopy(renderer, buffer, NULL, NULL);
		SDL_RenderPresent(renderer);
		SDL_Delay(10);
	}
	
	// I will spare you all the free()
}