Function putPixel

src/draw.cpp:1037–1072

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void putPixel(SDL_Surface* surface, int x, int y, Uint32 pixel)
{
	int bpp = surface->format->BytesPerPixel;
	// Here p is the address to the pixel we want to set
	Uint8* p = (Uint8*)surface->pixels + y * surface->pitch + x * bpp;

	switch (bpp)
	{
		case 1:
			*p = pixel;
			break;

		case 2:
			*(Uint16*)p = pixel;
			break;

		case 3:
			if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
			{
				p[0] = (pixel >> 16) & 0xff;
				p[1] = (pixel >> 8) & 0xff;
				p[2] = pixel & 0xff;
			}
			else
			{
				p[0] = pixel & 0xff;
				p[1] = (pixel >> 8) & 0xff;
				p[2] = (pixel >> 16) & 0xff;
			}
			break;

		case 4:
			*(Uint32*)p = pixel;
			break;
	}
}

/*-------------------------------------------------------------------------------