gistfile1.cpp

RGBAPixel gaussBlur(const RGBAImage& image, int x, int y, int radius) {
	int count = 0;
	int r = 0, g = 0, b = 0, a = 0;
	for (int dx = -radius; dx < radius; dx++)
		for (int dy = -radius; dy < radius; dy++) {
			int x2 = x + dx;
			int y2 = y + dy;
			if (x2 < 0 || y2 < 0 || x2 >= image.getWidth() || y2 >= image.getHeight())
				continue;
			count++;
			r += rgba_red(image.getPixel(x2, y2));
			g += rgba_green(image.getPixel(x2, y2));
			b += rgba_blue(image.getPixel(x2, y2));
			a += rgba_alpha(image.getPixel(x2, y2));
		}
	return rgba(r / count, g / count, b / count, a / count);
}

void RGBAImage::blur(RGBAImage& dest, int radius) const {
	dest.setSize(width, height);

	for (int x = 0; x < width; x++)
		for (int y = 0; y < height; y++)
			dest.pixel(x, y) = gaussBlur(*this, x, y, radius);
}