Java examples for 2D Graphics:Color
Create a new ColorModel with it's alpha pre multiplied state
/*/* w ww. ja v a 2s. c o m*/ * Copyright 2006-2014 ICEsoft Technologies Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an "AS * IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. See the License for the specific language * governing permissions and limitations under the License. */ //package com.java2s; import java.awt.image.*; public class Main { /** * Create a new ColorModel with it's alpha premultiplied state matching * newAlphaPreMult. * * @param cm The ColorModel to change the alpha premult state of. * @param newAlphaPreMult The new state of alpha premult. * @return A new colorModel that has isAlphaPremultiplied() * equal to newAlphaPreMult. */ public static ColorModel coerceColorModel(ColorModel cm, boolean newAlphaPreMult) { if (cm.isAlphaPremultiplied() == newAlphaPreMult) return cm; // Easiest way to build proper colormodel for new Alpha state... // Eventually this should switch on known ColorModel types and // only fall back on this hack when the CM type is unknown. WritableRaster wr = cm.createCompatibleWritableRaster(1, 1); return cm.coerceData(wr, newAlphaPreMult); } /** * Coerces data within a bufferedImage to match newAlphaPreMult, * Note that this can not change the colormodel of bi so you * * @param wr The raster to change the state of. * @param cm The colormodel currently associated with data in wr. * @param newAlphaPreMult The desired state of alpha Premult for raster. * @return A new colormodel that matches newAlphaPreMult. */ public static ColorModel coerceData(WritableRaster wr, ColorModel cm, boolean newAlphaPreMult) { // System.out.println("CoerceData: " + cm.isAlphaPremultiplied() + // " Out: " + newAlphaPreMult); if (!cm.hasAlpha()) // Nothing to do no alpha channel return cm; if (cm.isAlphaPremultiplied() == newAlphaPreMult) // nothing to do alpha state matches... return cm; // System.out.println("CoerceData: " + wr.getSampleModel()); if (newAlphaPreMult) { multiplyAlpha(wr); } else { divideAlpha(wr); } return coerceColorModel(cm, newAlphaPreMult); } public static void multiplyAlpha(WritableRaster wr) { if (is_BYTE_COMP_Data(wr.getSampleModel())) mult_BYTE_COMP_Data(wr); else if (is_INT_PACK_Data(wr.getSampleModel(), true)) mult_INT_PACK_Data(wr); else { int[] pixel = null; int bands = wr.getNumBands(); float norm = 1.0f / 255f; int x0, x1, y0, y1, a, b; float alpha; x0 = wr.getMinX(); x1 = x0 + wr.getWidth(); y0 = wr.getMinY(); y1 = y0 + wr.getHeight(); for (int y = y0; y < y1; y++) for (int x = x0; x < x1; x++) { pixel = wr.getPixel(x, y, pixel); a = pixel[bands - 1]; if ((a >= 0) && (a < 255)) { alpha = a * norm; for (b = 0; b < bands - 1; b++) pixel[b] = (int) (pixel[b] * alpha + 0.5f); wr.setPixel(x, y, pixel); } } } } public static void divideAlpha(WritableRaster wr) { if (is_BYTE_COMP_Data(wr.getSampleModel())) divide_BYTE_COMP_Data(wr); else if (is_INT_PACK_Data(wr.getSampleModel(), true)) divide_INT_PACK_Data(wr); else { int x0, x1, y0, y1, a, b; float ialpha; int bands = wr.getNumBands(); int[] pixel = null; x0 = wr.getMinX(); x1 = x0 + wr.getWidth(); y0 = wr.getMinY(); y1 = y0 + wr.getHeight(); for (int y = y0; y < y1; y++) for (int x = x0; x < x1; x++) { pixel = wr.getPixel(x, y, pixel); a = pixel[bands - 1]; if ((a > 0) && (a < 255)) { ialpha = 255 / (float) a; for (b = 0; b < bands - 1; b++) pixel[b] = (int) (pixel[b] * ialpha + 0.5f); wr.setPixel(x, y, pixel); } } } } public static boolean is_BYTE_COMP_Data(SampleModel sm) { // Check ColorModel is of type DirectColorModel if (!(sm instanceof ComponentSampleModel)) return false; // Check transfer type if (sm.getDataType() != DataBuffer.TYPE_BYTE) return false; return true; } protected static void mult_BYTE_COMP_Data(WritableRaster wr) { // System.out.println("Multiply Int: " + wr); ComponentSampleModel csm; csm = (ComponentSampleModel) wr.getSampleModel(); final int width = wr.getWidth(); final int scanStride = csm.getScanlineStride(); final int pixStride = csm.getPixelStride(); final int[] bandOff = csm.getBandOffsets(); DataBufferByte db = (DataBufferByte) wr.getDataBuffer(); final int base = (db.getOffset() + csm.getOffset( wr.getMinX() - wr.getSampleModelTranslateX(), wr.getMinY() - wr.getSampleModelTranslateY())); int aOff = bandOff[bandOff.length - 1]; int bands = bandOff.length - 1; // Access the pixel data array final byte[] pixels = db.getBankData()[0]; for (int y = 0; y < wr.getHeight(); y++) { int sp = base + y * scanStride; final int end = sp + width * pixStride; while (sp < end) { int a = pixels[sp + aOff] & 0xFF; if (a != 0xFF) for (int b = 0; b < bands; b++) { int i = sp + bandOff[b]; pixels[i] = (byte) (((pixels[i] & 0xFF) * a) >> 8); } sp += pixStride; } } } public static boolean is_INT_PACK_Data(SampleModel sm, boolean requireAlpha) { // Check ColorModel is of type DirectColorModel if (!(sm instanceof SinglePixelPackedSampleModel)) return false; // Check transfer type if (sm.getDataType() != DataBuffer.TYPE_INT) return false; SinglePixelPackedSampleModel sppsm; sppsm = (SinglePixelPackedSampleModel) sm; int[] masks = sppsm.getBitMasks(); if (masks.length == 3) { if (requireAlpha) return false; } else if (masks.length != 4) return false; if (masks[0] != 0x00ff0000) return false; if (masks[1] != 0x0000ff00) return false; if (masks[2] != 0x000000ff) return false; if ((masks.length == 4) && (masks[3] != 0xff000000)) return false; return true; } protected static void mult_INT_PACK_Data(WritableRaster wr) { // System.out.println("Multiply Int: " + wr); SinglePixelPackedSampleModel sppsm; sppsm = (SinglePixelPackedSampleModel) wr.getSampleModel(); final int width = wr.getWidth(); final int scanStride = sppsm.getScanlineStride(); DataBufferInt db = (DataBufferInt) wr.getDataBuffer(); final int base = (db.getOffset() + sppsm.getOffset(wr.getMinX() - wr.getSampleModelTranslateX(), wr.getMinY() - wr.getSampleModelTranslateY())); // Access the pixel data array final int[] pixels = db.getBankData()[0]; for (int y = 0; y < wr.getHeight(); y++) { int sp = base + y * scanStride; final int end = sp + width; while (sp < end) { int pixel = pixels[sp]; int a = pixel >>> 24; if ((a >= 0) && (a < 255)) { // this does NOT include a == 255 (0xff) ! pixels[sp] = ((a << 24) | ((((pixel & 0xFF0000) * a) >> 8) & 0xFF0000) | ((((pixel & 0x00FF00) * a) >> 8) & 0x00FF00) | ((((pixel & 0x0000FF) * a) >> 8) & 0x0000FF)); } sp++; } } } protected static void divide_BYTE_COMP_Data(WritableRaster wr) { // System.out.println("Multiply Int: " + wr); ComponentSampleModel csm; csm = (ComponentSampleModel) wr.getSampleModel(); final int width = wr.getWidth(); final int scanStride = csm.getScanlineStride(); final int pixStride = csm.getPixelStride(); final int[] bandOff = csm.getBandOffsets(); DataBufferByte db = (DataBufferByte) wr.getDataBuffer(); final int base = (db.getOffset() + csm.getOffset( wr.getMinX() - wr.getSampleModelTranslateX(), wr.getMinY() - wr.getSampleModelTranslateY())); int aOff = bandOff[bandOff.length - 1]; int bands = bandOff.length - 1; // Access the pixel data array final byte[] pixels = db.getBankData()[0]; for (int y = 0; y < wr.getHeight(); y++) { int sp = base + y * scanStride; final int end = sp + width * pixStride; while (sp < end) { int a = pixels[sp + aOff] & 0xFF; if (a == 0) { for (int b = 0; b < bands; b++) pixels[sp + bandOff[b]] = (byte) 0xFF; } else if (a < 255) { // this does NOT include a == 255 (0xff) ! int aFP = (0x00FF0000 / a); for (int b = 0; b < bands; b++) { int i = sp + bandOff[b]; pixels[i] = (byte) (((pixels[i] & 0xFF) * aFP) >>> 16); } } sp += pixStride; } } } protected static void divide_INT_PACK_Data(WritableRaster wr) { // System.out.println("Divide Int"); SinglePixelPackedSampleModel sppsm; sppsm = (SinglePixelPackedSampleModel) wr.getSampleModel(); final int width = wr.getWidth(); final int scanStride = sppsm.getScanlineStride(); DataBufferInt db = (DataBufferInt) wr.getDataBuffer(); final int base = (db.getOffset() + sppsm.getOffset(wr.getMinX() - wr.getSampleModelTranslateX(), wr.getMinY() - wr.getSampleModelTranslateY())); // Access the pixel data array final int[] pixels = db.getBankData()[0]; for (int y = 0; y < wr.getHeight(); y++) { int sp = base + y * scanStride; final int end = sp + width; while (sp < end) { int pixel = pixels[sp]; int a = pixel >>> 24; if (a <= 0) { pixels[sp] = 0x00FFFFFF; } else if (a < 255) { int aFP = (0x00FF0000 / a); pixels[sp] = ((a << 24) | (((((pixel & 0xFF0000) >> 16) * aFP) & 0xFF0000)) | (((((pixel & 0x00FF00) >> 8) * aFP) & 0xFF0000) >> 8) | (((((pixel & 0x0000FF)) * aFP) & 0xFF0000) >> 16)); } sp++; } } } }