19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one or more 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contributor license agreements. See the NOTICE file distributed with 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * this work for additional information regarding copyright ownership. 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The ASF licenses this file to You under the Apache License, Version 2.0 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (the "License"); you may not use this file except in compliance with 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the License. You may obtain a copy of the License at 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @author Igor V. Stolyarov 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @version $Revision$ 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Created on 02.11.2004 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage org.apache.harmony.awt.gl.color; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.color.ColorSpace; 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class LUTColorConverter { 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static byte from8lRGBtosRGB_LUT[]; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static byte from16lRGBtosRGB_LUT[]; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static byte fromsRGBto8lRGB_LUT[]; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static short fromsRGBto16lRGB_LUT[]; 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static byte fromsRGBto8sRGB_LUTs[][]; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static ColorSpace LINEAR_RGB_CS; 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static ColorSpace LINEAR_GRAY_CS; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static ColorSpace sRGB_CS; 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public LUTColorConverter() { 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This class prepared and returned lookup tables for conversion color 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * values from Linear RGB Color Space to sRGB and vice versa. 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Conversion is producing according to sRGB Color Space definition. 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * "A Standard Default Color Space for the Internet - sRGB", 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Michael Stokes (Hewlett-Packard), Matthew Anderson (Microsoft), 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Srinivasan Chandrasekar (Microsoft), Ricardo Motta (Hewlett-Packard) 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Version 1.10, November 5, 1996 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This document is available: http://www.w3.org/Graphics/Color/sRGB 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static byte[] getFrom8lRGBtosRGB_LUT() { 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (from8lRGBtosRGB_LUT == null) { 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project from8lRGBtosRGB_LUT = new byte[256]; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float v; 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < 256; i++) { 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project v = (float)i / 255; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project v = (v <= 0.04045f) ? v / 12.92f : 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (float) Math.pow((v + 0.055) / 1.055, 2.4); 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project from8lRGBtosRGB_LUT[i] = (byte) Math.round(v * 255.0f); 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return from8lRGBtosRGB_LUT; 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static byte[] getFrom16lRGBtosRGB_LUT() { 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (from16lRGBtosRGB_LUT == null) { 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project from16lRGBtosRGB_LUT = new byte[65536]; 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float v; 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < 65536; i++) { 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project v = (float) i / 65535; 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project v = (v <= 0.04045f) ? v / 12.92f : 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (float) Math.pow((v + 0.055) / 1.055, 2.4); 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project from16lRGBtosRGB_LUT[i] = (byte) Math.round(v * 255.0f); 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return from16lRGBtosRGB_LUT; 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static byte[] getFromsRGBto8lRGB_LUT() { 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fromsRGBto8lRGB_LUT == null) { 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project fromsRGBto8lRGB_LUT = new byte[256]; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float v; 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < 256; i++) { 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project v = (float) i / 255; 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project v = (v <= 0.0031308f) ? v * 12.92f : 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ((float) Math.pow(v, 1.0 / 2.4)) * 1.055f - 0.055f; 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project fromsRGBto8lRGB_LUT[i] = (byte) Math.round(v * 255.0f); 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return fromsRGBto8lRGB_LUT; 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static short[] getFromsRGBto16lRGB_LUT() { 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fromsRGBto16lRGB_LUT == null) { 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project fromsRGBto16lRGB_LUT = new short[256]; 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float v; 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < 256; i++) { 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project v = (float) i / 255; 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project v = (v <= 0.0031308f) ? v * 12.92f : 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ((float) Math.pow(v, 1.0 / 2.4)) * 1.055f - 0.055f; 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project fromsRGBto16lRGB_LUT[i] = (short) Math.round(v * 65535.0f); 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return fromsRGBto16lRGB_LUT; 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static byte[] getsRGBLUT(int bits) { 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (bits < 1) return null; 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int idx = bits -1; 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if(fromsRGBto8sRGB_LUTs == null) fromsRGBto8sRGB_LUTs = new byte[16][]; 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if(fromsRGBto8sRGB_LUTs[idx] == null){ 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project fromsRGBto8sRGB_LUTs[idx] = createLUT(bits); 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return fromsRGBto8sRGB_LUTs[idx]; 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static byte[] createLUT(int bits) { 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int lutSize = (1 << bits); 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte lut[] = new byte[lutSize]; 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < lutSize; i++) { 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lut[i] = (byte) (255.0f / (lutSize - 1) + 0.5f); 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return lut; 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static boolean is_LINEAR_RGB_CS(ColorSpace cs) { 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (cs == LINEAR_RGB_CS); 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static boolean is_LINEAR_GRAY_CS(ColorSpace cs) { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (cs == LINEAR_GRAY_CS); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static boolean is_sRGB_CS(ColorSpace cs) { 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (cs == sRGB_CS); 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project}