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/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* SamplingFactory.java
* ---------------
*/
package org.jpedal.images;
public class SamplingFactory {
/**
* do nothing
*/
public static int none;
/**
* medium will make sure images larger than page are reduced in size (often large scanned tiffs)
*/
public static final int medium = 1;
/**
* (default setting) high will agressively reduce images bigger than twice their drawn size at 100% so a image
* which appears as 100x100 on the PDF but whose raw images is 250x250 will be stored as 125x125 image
* and not a 250x250 image
*/
public static final int high = 2;
/**
* use down-sampling on printing (which is default)
*/
public static final int print_enable = 3;
/**
* do not use down-sampling on printing
*/
public static final int print_disable = 4;
/**
* current setting - do not set directly
*/
public static int downsampleLevel = high;
/**
* current setting - do not set directly
*/
public static boolean isPrintDownsampleEnabled = true;
public static boolean kernelSharpen;
//sharpening kernel
private static double[][] sharpenKernel = {{0, -1, 0}, {-1, 5, -1}, {0, -1, 0}};
/* 5x5 version
private static double[][] sharpenKernel = {{0,0, 0, 0,0},{0,0, -1, 0,0},{0,-1, 5, -1,0},{0,0, -1, 0,0},{0,0, 0, 0,0}};
/**/
/**
* PDFs contain images which may often be much larger than the actual space they occupy and they are reduced to fit the space
* alters image sampling to speed up program and reduce memory in with the strategies "high","medium", "none", "enable_printing", "disable_printing"
*
* @param newLevel A String value of image sampling strategies
*/
public static void setDownsampleMode(String newLevel) {
if (newLevel == null) {
newLevel = System.getProperty("org.jpedal.downsample");
}
if (newLevel != null) {
if (newLevel.equals("high") || newLevel.equals("\"high\"")) {
downsampleLevel = high;
} else if (newLevel.equals("medium") || newLevel.equals("\"medium\"")) {
downsampleLevel = medium;
} else if (newLevel.equals("none") || newLevel.equals("\"none\"")) {
downsampleLevel = none;
} else if (newLevel.equals("print_disable") || newLevel.equals("\"print_disable\"")) {
isPrintDownsampleEnabled = false;
} else if (newLevel.equals("print_enable") || newLevel.equals("\"print_enable\"")) {
isPrintDownsampleEnabled = true;
}
}
}
/**
* PDFs contain images which may often be much larger than the actual space they occupy and they are reduced to fit the space
* alters image sampling to speed up program and reduce memory with the strategies high, medium, none, enable_printing, disable_printing
*
* @param newLevel A String value of image sampling strategies
*/
@SuppressWarnings("UnusedDeclaration")
public static void setDownsampleMode(final int newLevel) {
if (newLevel == high || newLevel == medium || newLevel == none) {
downsampleLevel = newLevel;
} else if (newLevel == print_disable) {
isPrintDownsampleEnabled = false;
} else if (newLevel == print_enable) {
isPrintDownsampleEnabled = true;
}
}
/**
* allow user to over-ride default setting and set their own
* 3x3 kernel to sharpen down-sampled images
*
* @param userKernel
*/
public static void setSharpenKernel(double[][] userKernel) {
sharpenKernel = userKernel;
}
public static double[][] getSharpenKernel() {
return sharpenKernel;
}
}
