001/* 002Copyright 2006 Jerry Huxtable 003 004Licensed under the Apache License, Version 2.0 (the "License"); 005you may not use this file except in compliance with the License. 006You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010Unless required by applicable law or agreed to in writing, software 011distributed under the License is distributed on an "AS IS" BASIS, 012WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013See the License for the specific language governing permissions and 014limitations under the License. 015*/ 016 017package com.jhlabs.image; 018 019import java.awt.*; 020import java.awt.image.*; 021import java.util.*; 022 023/** 024 * A filter which allows channels to be swapped. You provide a matrix with specifying the input channel for 025 * each output channel. 026 */ 027public class SwizzleFilter extends PointFilter { 028 029 private int[] matrix = { 030 1, 0, 0, 0, 0, 031 0, 1, 0, 0, 0, 032 0, 0, 1, 0, 0, 033 0, 0, 0, 1, 0 034 }; 035 036 public SwizzleFilter() { 037 } 038 039 /** 040 * Set the swizzle matrix. 041 * @param matrix the matrix 042 * @see #getMatrix 043 */ 044 public void setMatrix( int[] matrix ) { 045 this.matrix = matrix; 046 } 047 048 /** 049 * Get the swizzle matrix. 050 * @return the matrix 051 * @see #setMatrix 052 */ 053 public int[] getMatrix() { 054 return matrix; 055 } 056 057 public int filterRGB(int x, int y, int rgb) { 058 int a = (rgb >> 24) & 0xff; 059 int r = (rgb >> 16) & 0xff; 060 int g = (rgb >> 8) & 0xff; 061 int b = rgb & 0xff; 062 063 a = matrix[0]*a + matrix[1]*r + matrix[2]*g + matrix[3]*b + matrix[4]*255; 064 r = matrix[5]*a + matrix[6]*r + matrix[7]*g + matrix[8]*b + matrix[9]*255; 065 g = matrix[10]*a + matrix[11]*r + matrix[12]*g + matrix[13]*b + matrix[14]*255; 066 b = matrix[15]*a + matrix[16]*r + matrix[17]*g + matrix[18]*b + matrix[19]*255; 067 068 a = PixelUtils.clamp( a ); 069 r = PixelUtils.clamp( r ); 070 g = PixelUtils.clamp( g ); 071 b = PixelUtils.clamp( b ); 072 073 return (a << 24) | (r << 16) | (g << 8) | b; 074 } 075 076 public String toString() { 077 return "Channels/Swizzle..."; 078 } 079 080} 081