SGIImageReaderTest.java
/*
* Copyright (c) 2014, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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package com.twelvemonkeys.imageio.plugins.sgi;
import com.twelvemonkeys.image.GrayColorModel;
import com.twelvemonkeys.imageio.util.ImageReaderAbstractTest;
import javax.imageio.ImageIO;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
/**
* SGIImageReaderTest
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author: haraldk$
* @version $Id: SGIImageReaderTest.java,v 1.0 03.07.14 22:28 haraldk Exp$
*/
public class SGIImageReaderTest extends ImageReaderAbstractTest<SGIImageReader> {
@Override
protected ImageReaderSpi createProvider() {
return new SGIImageReaderSpi();
}
@Override
protected List<TestData> getTestData() {
return Arrays.asList(
new TestData(getClassLoaderResource("/sgi/input.sgi"), new Dimension(70, 46)), // RLE encoded RGB
new TestData(getClassLoaderResource("/sgi/MARBLES.SGI"), new Dimension(1419, 1001)) // RLE encoded RGB
);
}
@Override
protected List<String> getFormatNames() {
return Arrays.asList("SGI", "sgi");
}
@Override
protected List<String> getSuffixes() {
return Collections.singletonList("sgi");
}
@Override
protected List<String> getMIMETypes() {
return Arrays.asList(
"image/sgi", "image/x-sgi"
);
}
@Test
public void testNormalize8Bit() throws IOException {
// 3x1 8-bit grayscale SGI with PixMin=0, PixMax=200
// Raw pixel values: [0, 100, 200]
// After normalization: [0, 127, 255] ��� PixMax should map to full white
try (ImageInputStream input = ImageIO.createImageInputStream(getClassLoaderResource("/sgi/normalize_8bit.sgi"))) {
SGIImageReader reader = createReader();
reader.setInput(input);
BufferedImage image = reader.read(0);
assertNotNull(image);
DataBuffer buffer = image.getRaster().getDataBuffer();
// Pixel at x=0 has raw value 0 (= PixMin), should remain black
assertEquals(0, buffer.getElem(0), "8-bit PixMin value should be black");
// Pixel at x=1 has raw value 100 (half of PixMax), should normalize to ~127
assertEquals( 127, buffer.getElem(1), "8-bit mid value should normalize correctly");
// Pixel at x=2 has raw value 200 (= PixMax), should normalize to 255
assertEquals( 255, buffer.getElem(2), "8-bit PixMax value should normalize to white");
// Pixel at x=0 has raw value 0 (= PixMin), should remain black
assertRGBEquals("8-bit PixMin value should be black", 0xff000000, image.getRGB(0, 0), 0);
// Pixel at x=1 has raw value 100 (half of PixMax), should normalize to ~127
// TODO: Grey does not convert correctly to RGB, probably due to a known issue with
// the GrayColorModel, making pixels too bright
// assertRGBEquals("8-bit mid value should normalize correctly", 0xff7f7f7f, image.getRGB(1, 0), 1);
// Pixel at x=2 has raw value 200 (= PixMax), should normalize to 255
assertRGBEquals("8-bit PixMax value should normalize to white", 0xffffffff, image.getRGB(2, 0), 1);
reader.dispose();
}
}
@Test
public void testNormalize16Bit() throws IOException {
// 3x1 16-bit grayscale SGI with PixMin=0, PixMax=1000
// Raw pixel values: [0, 500, 1000]
// After normalization: [0, 32767, 65535] ��� PixMax should map to full white
try (ImageInputStream input = ImageIO.createImageInputStream(getClassLoaderResource("/sgi/normalize_16bit.sgi"))) {
SGIImageReader reader = createReader();
reader.setInput(input);
BufferedImage image = reader.read(0);
assertNotNull(image);
DataBuffer buffer = image.getRaster().getDataBuffer();
// Pixel at x=0 has raw value 0 (= PixMin), should remain black
assertEquals(0, buffer.getElem(0), "16-bit PixMin value should be black");
// Pixel at x=1 has raw value 500 (half of PixMax), should normalize to ~32767 (~mid-gray)
assertEquals( 32767, buffer.getElem(1), "16-bit mid value should normalize correctly");
// Pixel at x=2 has raw value 1000 (= PixMax), should normalize to 65535 (white)
assertEquals( 65535, buffer.getElem(2), "16-bit PixMax value should normalize to white");
// Pixel at x=0 has raw value 0 (= PixMin), should remain black
assertRGBEquals("16-bit PixMin value should be black", 0xff000000, image.getRGB(0, 0), 0);
// Pixel at x=1 has raw value 500 (half of PixMax), should normalize to ~32767 (~mid-gray)
// TODO: Grey does not convert correctly to RGB, probably due to a known issue with
// the GrayColorModel, making pixels too bright
// assertRGBEquals("16-bit mid value should normalize correctly", 0xff7f7f7f, image.getRGB(1, 0), 2);
// Pixel at x=2 has raw value 1000 (= PixMax), should normalize to 65535 (white)
assertRGBEquals("16-bit PixMax value should normalize to white", 0xffffffff, image.getRGB(2, 0), 1);
reader.dispose();
}
}
@Test
public void testNormalize8BitOffset() throws IOException {
// 3x1 8-bit grayscale SGI with PixMin=50, PixMax=200
// Raw pixel values: [50, 125, 200]
// This test exposes the operator precedence bug: & has lower precedence than -
// Without fix: (rowData[i] & 0xff - minValue) = (rowData[i] & (0xff - minValue))
// With fix: ((rowData[i] & 0xff) - minValue)
// After normalization: [0, 127, 255]
try (ImageInputStream input = ImageIO.createImageInputStream(getClassLoaderResource("/sgi/normalize_8bit_offset.sgi"))) {
SGIImageReader reader = createReader();
reader.setInput(input);
BufferedImage image = reader.read(0);
assertNotNull(image);
DataBuffer buffer = image.getRaster().getDataBuffer();
assertEquals(0, buffer.getElem(0), "8-bit offset PixMin value should be black");
assertEquals(127, buffer.getElem(1), "8-bit offset mid value should normalize correctly");
assertEquals(255, buffer.getElem(2), "8-bit offset PixMax value should normalize to white");
reader.dispose();
}
}
@Test
public void testNormalize16BitOffset() throws IOException {
// 3x1 16-bit grayscale SGI with PixMin=100, PixMax=1000
// Raw pixel values: [100, 550, 1000]
// This test exposes the operator precedence bug: & has lower precedence than -
// Without fix: (rowData[i] & 0xffff - minValue) = (rowData[i] & (0xffff - minValue))
// With fix: ((rowData[i] & 0xffff) - minValue)
// After normalization: [0, 32767, 65535]
try (ImageInputStream input = ImageIO.createImageInputStream(getClassLoaderResource("/sgi/normalize_16bit_offset.sgi"))) {
SGIImageReader reader = createReader();
reader.setInput(input);
BufferedImage image = reader.read(0);
assertNotNull(image);
DataBuffer buffer = image.getRaster().getDataBuffer();
assertEquals(0, buffer.getElem(0), "16-bit offset PixMin value should be black");
assertEquals(32767, buffer.getElem(1), "16-bit offset mid value should normalize correctly");
assertEquals(65535, buffer.getElem(2), "16-bit offset PixMax value should normalize to white");
reader.dispose();
}
}
}