ColorImage.java

/**
 * Represents color images.
 * Image data is represented as a matrix:
 * - the number of lines corresponds to the image height (data.length)
 * - the length of the lines corresponds to the image width (data[*].length)
 * - pixel color is encoded as integers (ARGB)
 */
class ColorImage {

	private int[][] data; // @colorimage

	ColorImage(String file) {
		this.data = ImageUtil.readColorImage(file);
	}

	ColorImage(int width, int height) {
		data = new int[height][width];
	}

	int getWidth() {
		return data[0].length;
	}

	int getHeight() {
		return data.length;
	}

	void setColor(int x, int y, Color c) {
		data[y][x] = ImageUtil.encodeRgb(c.getR(), c.getG(), c.getB());
	}

	Color getColor(int x, int y) {
		int[] rgb = ImageUtil.decodeRgb(data[y][x]);
		return new Color(rgb[0], rgb[1], rgb[2]);
	}
	
	void invertColor(){
		for (int i = 0; i < this.getHeight(); i++)
			for (int j = 0; j < this.getWidth(); j++){
				Color tmp = getColor(j, i);
				tmp.invert();
				this.setColor(j, i, tmp);
			}
		}
	
	void adjustBrightness(int val){
		for (int i = 0; i < this.getHeight(); i++)
			for (int j = 0; j < this.getWidth(); j++){
				Color tmp = getColor(j, i);
				tmp.adjustBrightness(val);
				this.setColor(j, i, tmp);
			}
	}
	
	void reflectImage(){
		for (int i = 0; i < this.getHeight(); i++)
			for (int j = 0; j < this.getWidth() / 2; j++){
				Color tmp = getColor(j, i);
				this.setColor(j, i, this.getColor(this.getWidth() - j - 1, i));
				this.setColor(this.getWidth() - j - 1, i, tmp);
			}
	}
	
	void pasteImage(int x, int y, ColorImage img){
		for (int i = Math.max(y, 0); i < Math.min(img.getHeight() + y, this.getHeight()); i++)
			for (int j = Math.max(x, 0); j < Math.min(img.getWidth() + x, this.getWidth()); j++)
				this.setColor(j, i, img.getColor(j - x, i - y));
	}
	
	ColorImage blackAndWhite(){
		ColorImage res = new ColorImage(this.getWidth(), this.getHeight());
		for (int i = 0; i < this.getHeight(); i++)
			for (int j = 0; j < this.getWidth(); j++){
				Color tmp = getColor(j, i);
				if (tmp.getLuminance() < 128)
					res.setColor(j, i, Color.BLACK);
				else
					res.setColor(j, i, Color.WHITE);
			}
		return res;
	}
	
	ColorImage copyImage(){
		ColorImage res = new ColorImage(this.getWidth(), this.getHeight());
		for (int i = 0; i < this.getHeight(); i++)
			for (int j = 0; j < this.getWidth(); j++)
					res.setColor(j, i, this.getColor(j, i));
		return res;
	}
	/*ainda nao esta blindada para valores invalidos de x e y*/
	ColorImage selection(int start_x, int start_y, int end_x, int end_y){
		ColorImage res = new ColorImage(end_x - start_x, end_y - start_y);
		for (int i = start_y; i < end_y; i++)
			for (int j = start_x; j < end_x; j++)
					res.setColor(j - start_x, i - start_y, this.getColor(j, i));
		return res;
	}
	
	
}