aigo/lib/image.cpp

#include "image.h"

namespace Image
{
	void threshold(SDL_Surface *image, int lowerBound, int upperBound)
	{
		int x, y;
		for (int i = 0; i < image->w * image->h; ++i)
		{
			int gray = GRAY(((uint32_t*)image->pixels)[i]);
			if (gray > lowerBound && gray < upperBound)
				((uint32_t*)image->pixels)[i] = 0xffffffff;
			else
				((uint32_t*)image->pixels)[i] = 0xff000000;
				//gray | (gray << 8) | (gray << 16);

		}
	}

	SDL_Surface *copySurface(SDL_Surface *s)
	{
		SDL_Surface *copy = SDL_CreateRGBSurface(SDL_SWSURFACE, s->w, s->h,
							 s->format->BitsPerPixel,
							 s->format->Rmask, s->format->Gmask,
							 s->format->Bmask, s->format->Amask);
		SDL_BlitSurface(s, NULL, copy, NULL);
		return copy;
	}


}