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.*; 021 022/** 023 * Scales an image using bi-cubic interpolation, which can't be done with AffineTransformOp. 024 */ 025public class BicubicScaleFilter extends AbstractBufferedImageOp { 026 027 private int width; 028 private int height; 029 030 /** 031 * Construct a BicubicScaleFilter which resizes to 32x32 pixels. 032 */ 033 public BicubicScaleFilter() { 034 this(32, 32); 035 } 036 037 /** 038 * Constructor for a filter which scales the input image to the given width and height using bicubic interpolation. 039 * Unfortunately, it appears that bicubic actually looks worse than bilinear interpolation on most Java implementations, 040 * but you can be the judge. 041 * @param width the width of the output image 042 * @param height the height of the output image 043 */ 044 public BicubicScaleFilter( int width, int height ) { 045 this.width = width; 046 this.height = height; 047 } 048 049 public BufferedImage filter( BufferedImage src, BufferedImage dst ) { 050 int w = src.getWidth(); 051 int h = src.getHeight(); 052 053 if ( dst == null ) { 054 ColorModel dstCM = src.getColorModel(); 055 dst = new BufferedImage(dstCM, dstCM.createCompatibleWritableRaster(width, height), dstCM.isAlphaPremultiplied(), null); 056 } 057 058 Graphics2D g = dst.createGraphics(); 059 g.setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC ); 060 g.drawImage( src, 0, 0, width, height, null ); 061 g.dispose(); 062 063 return dst; 064 } 065 066 public String toString() { 067 return "Distort/Bicubic Scale"; 068 } 069 070}