001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019package lucee.runtime.img.composite; 020 021import java.awt.CompositeContext; 022import java.awt.RenderingHints; 023import java.awt.image.ColorModel; 024 025public final class AddComposite extends RGBComposite { 026 027 public AddComposite( float alpha ) { 028 super( alpha ); 029 } 030 031 public CompositeContext createContext( ColorModel srcColorModel, ColorModel dstColorModel, RenderingHints hints ) { 032 return new Context( extraAlpha, srcColorModel, dstColorModel ); 033 } 034 035 static class Context extends RGBCompositeContext { 036 public Context( float alpha, ColorModel srcColorModel, ColorModel dstColorModel ) { 037 super( alpha, srcColorModel, dstColorModel ); 038 } 039 040 public void composeRGB( int[] src, int[] dst, float alpha ) { 041 int w = src.length; 042 043 for ( int i = 0; i < w; i += 4 ) { 044 int sr = src[i]; 045 int dir = dst[i]; 046 int sg = src[i+1]; 047 int dig = dst[i+1]; 048 int sb = src[i+2]; 049 int dib = dst[i+2]; 050 int sa = src[i+3]; 051 int dia = dst[i+3]; 052 int dor, dog, dob; 053 054 dor = dir + sr; 055 if ( dor > 255 ) 056 dor = 255; 057 dog = dig + sg; 058 if ( dog > 255 ) 059 dog = 255; 060 dob = dib + sb; 061 if ( dob > 255 ) 062 dob = 255; 063 064 float a = alpha*sa/255f; 065 float ac = 1-a; 066 067 dst[i] = (int)(a*dor + ac*dir); 068 dst[i+1] = (int)(a*dog + ac*dig); 069 dst[i+2] = (int)(a*dob + ac*dib); 070 dst[i+3] = (int)(sa*alpha + dia*ac); 071 } 072 } 073 } 074 075}