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Openhtmltopdf is a CSS 2.1 renderer written in Java. This artifact supports PDF output with Apache PDF-BOX 2.
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package com.openhtmltopdf.pdfboxout.visualtester;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.DataBufferDouble;
import java.awt.image.DataBufferFloat;
import java.awt.image.DataBufferInt;
import java.awt.image.DataBufferShort;
import java.awt.image.DataBufferUShort;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.pdfbox.Loader;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
public class PdfVisualTester {
private static final int LEFT_MARGIN_PX = 45;
private static final int LINE_HEIGHT_PX = 17;
private static final BufferedImage ONE_PX_IMAGE = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
public static class TestImage {
/**
* @return the test name passed into {@link PdfVisualTester#comparePdfDocuments(byte[], byte[], String, boolean)}
*/
public String getTestName() {
return testName;
}
/**
* @return the page number.
*/
public int getPageNumber() {
return pageNumber;
}
/**
* Get the expected rendered image.
* @return the expected image, should never be null.
*/
public BufferedImage getExpected() {
return expected;
}
/**
* Get the actual rendered image.
* @return the actual image, may be null if expected has more pages than actual
*/
public BufferedImage getActual() {
return actual;
}
/**
* Creates a diff image to quickly spot differences between expected and actual.
* NOTE: May be expensive for large images.
* @return the diff image.
* See {@link #hasDifferences}
*/
public BufferedImage createDiff() {
if (actual == null) {
return createDiffImage(expected, PdfVisualTester.ONE_PX_IMAGE);
}
return createDiffImage(expected, actual);
}
/**
* Should usually be called before {@link #createDiff()}.
* @return true if the images are different. Precaulculated.
*/
public boolean hasDifferences() {
return differences;
}
private final String testName;
private final int pageNumber;
private final BufferedImage expected;
private final BufferedImage actual;
private final boolean differences;
private TestImage(String test, int pageNo, BufferedImage exp, BufferedImage act, boolean hasDifferences) {
this.expected = exp;
this.actual = act;
this.testName = test;
this.pageNumber = pageNo;
this.differences = hasDifferences;
}
}
public enum ProblemType {
PAGE_GOOD,
NO_EXPECTED_DOCUMENT_PROVIDED,
NO_ACTUAL_DOCUMENT_PROVIDED,
EXTRA_EXPECTED_PAGE,
PAGE_COUNT_DIFFERENT,
PAGE_SIZE_DIFFERENT,
PAGE_VISUALLY_DIFFERENT;
}
public static class PdfCompareResult {
public final ProblemType type;
public final String logMessage;
public final int pageNumber;
public final TestImage testImages;
public static final int INALID_PAGE_NO = -1;
private PdfCompareResult(ProblemType type, String logMessage, int pageNumber, TestImage testImage) {
this.type = type;
this.logMessage = type.toString() + ": " + logMessage;
this.pageNumber = pageNumber;
this.testImages = testImage;
}
}
/**
* Compares two PDF documents by rendering each page to an image and comparing pixel by pixel.
* @param expected
* @param actual
* @param testName
* @param keepSameImages Whether to return the images in the case they are good (ie. the same).
* @return A list of {@link PdfCompareResult} instances describing differences.
*/
public static List comparePdfDocuments(byte[] expected, byte[] actual, String testName, boolean keepSameImages) throws IOException {
List problems = new ArrayList<>();
if (expected == null ||
expected.length == 0) {
problems.add(
new PdfCompareResult(
ProblemType.NO_EXPECTED_DOCUMENT_PROVIDED,
String.format("Test name='%s'", testName),
PdfCompareResult.INALID_PAGE_NO,
null
));
}
if (actual == null ||
actual.length == 0) {
problems.add(
new PdfCompareResult(
ProblemType.NO_ACTUAL_DOCUMENT_PROVIDED,
String.format("Test name='%s'", testName),
PdfCompareResult.INALID_PAGE_NO,
null
));
}
if (!problems.isEmpty()) {
return problems;
}
try (PDDocument docActual = Loader.loadPDF(actual);
PDDocument docExpected = Loader.loadPDF(expected)) {
PDFRenderer rendActual = new PDFRenderer(docActual);
PDFRenderer rendExpected = new PDFRenderer(docExpected);
if (docActual.getNumberOfPages() != docExpected.getNumberOfPages()) {
problems.add(
new PdfCompareResult(
ProblemType.PAGE_COUNT_DIFFERENT,
String.format(
"Test name='%s', expected page count='%d', actual page count='%d'",
testName, docExpected.getNumberOfPages(), docActual.getNumberOfPages()),
PdfCompareResult.INALID_PAGE_NO,
null
));
}
for (int i = 0; i < docExpected.getNumberOfPages(); i++) {
BufferedImage imgActual = i >= docActual.getNumberOfPages()
? null : rendActual.renderImageWithDPI(i, 96f, ImageType.RGB);
BufferedImage imgExpected = i >= docExpected.getNumberOfPages()
? null : rendExpected.renderImageWithDPI(i, 96f, ImageType.RGB);
if (i >= docActual.getNumberOfPages()) {
problems.add(
new PdfCompareResult(
ProblemType.EXTRA_EXPECTED_PAGE,
String.format("Test name='%s', page number='%d'", testName, i),
i,
new TestImage(testName, i, imgExpected, null, true)
));
} else if (imgActual.getWidth() != imgExpected.getWidth() ||
imgActual.getHeight() != imgExpected.getHeight()) {
problems.add(
new PdfCompareResult(
ProblemType.PAGE_SIZE_DIFFERENT,
String.format(
"Test name='%s', page number='%d', expected size='%d x %d', actual size='%d x %d'",
testName, i, imgExpected.getWidth(),
imgExpected.getHeight(),
imgActual.getWidth(),
imgActual.getHeight()),
i,
new TestImage(testName, i, imgExpected, imgActual, true)
));
} else if (isImageDifferent(imgExpected, imgActual)) {
problems.add(
new PdfCompareResult(
ProblemType.PAGE_VISUALLY_DIFFERENT,
String.format("Test name='%s', page number='%d'", testName, i),
i,
new TestImage(testName, i, imgExpected, imgActual, true)
));
} else if (keepSameImages) {
problems.add(
new PdfCompareResult(
ProblemType.PAGE_GOOD,
String.format("Test name='%s', page number='%d'", testName, i),
i,
new TestImage(testName, i, imgExpected, imgActual, false)
));
}
}
return problems;
}
}
/**
* Gets the data buffer of each image and compares.
* NOTE: May be an expensive (memory and CPU) operation for large images.
* @param imgExpected
* @param imgActual
* @return whether imgExpected is different image compared to imgActual
*/
private static boolean isImageDifferent(BufferedImage imgExpected, BufferedImage imgActual) {
DataBuffer dbExpected = imgExpected.getData().getDataBuffer();
DataBuffer dbActual = imgActual.getData().getDataBuffer();
if (dbExpected.getDataType() != dbActual.getDataType()) {
return true;
}
switch (dbExpected.getDataType()) {
case DataBuffer.TYPE_BYTE:
return !Arrays.equals(
((DataBufferByte) dbExpected).getData(), ((DataBufferByte) dbActual).getData());
case DataBuffer.TYPE_SHORT:
return !Arrays.equals(
((DataBufferShort) dbExpected).getData(), ((DataBufferShort) dbActual).getData());
case DataBuffer.TYPE_USHORT:
return !Arrays.equals(
((DataBufferUShort) dbExpected).getData(), ((DataBufferUShort) dbActual).getData());
case DataBuffer.TYPE_INT:
return !Arrays.equals(
((DataBufferInt) dbExpected).getData(), ((DataBufferInt) dbActual).getData());
case DataBuffer.TYPE_FLOAT:
return !Arrays.equals(
((DataBufferFloat) dbExpected).getData(), ((DataBufferFloat) dbActual).getData());
case DataBuffer.TYPE_DOUBLE:
return !Arrays.equals(
((DataBufferDouble) dbExpected).getData(), ((DataBufferDouble) dbActual).getData());
case DataBuffer.TYPE_UNDEFINED:
return true;
}
return true;
}
public static BufferedImage createDiffImage(BufferedImage img1, BufferedImage img2) {
int maxW = Math.max(img1.getWidth(), img2.getWidth());
int maxH = Math.max(img1.getHeight(), img2.getHeight());
BufferedImage diff = new BufferedImage(
maxW + LEFT_MARGIN_PX, maxH, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = diff.createGraphics();
g2d.setPaint(Color.WHITE);
g2d.fillRect(0, 0, diff.getWidth(), diff.getHeight());
g2d.dispose();
DataBuffer db = diff.getRaster().getDataBuffer();
boolean hasDifferences = false;
List lines = new ArrayList<>(maxH / 10);
for (int y = 0; y < maxH; y++) {
int diffLineOffset = y * (maxW + LEFT_MARGIN_PX);
if (y % LINE_HEIGHT_PX == 0 && y != 0) {
lines.add(hasDifferences);
hasDifferences = false;
}
for (int x = 0; x < maxW; x++) {
int actualPixel = getActualPixel(img1, x, y);
int expectedPixel = getExpectedPixel(img2, x, y);
if (actualPixel != expectedPixel) {
hasDifferences = true;
db.setElem(diffLineOffset + x + LEFT_MARGIN_PX, getElement(expectedPixel, actualPixel));
} else {
db.setElem(diffLineOffset + x + LEFT_MARGIN_PX, getElement(expectedPixel, actualPixel));
}
}
}
g2d = diff.createGraphics();
g2d.setFont(new Font("Monospaced", Font.PLAIN, LINE_HEIGHT_PX - 2));
g2d.setPaint(Color.BLACK);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int ascent = g2d.getFontMetrics().getAscent();
for (int i = 0; i < lines.size(); i++) {
boolean differs = lines.get(i);
if (differs) {
g2d.setPaint(Color.PINK);
g2d.fillRect(0, i * LINE_HEIGHT_PX, LEFT_MARGIN_PX, LINE_HEIGHT_PX);
g2d.setPaint(Color.BLACK);
}
g2d.drawString(String.format("%03d", i), /* left-padding */ 2, (i * LINE_HEIGHT_PX) + 1 + ascent);
}
g2d.dispose();
return diff;
}
private static int getExpectedPixel(BufferedImage img, int x, int y) {
if (x >= img.getWidth() ||
y >= img.getHeight()) {
return Color.PINK.getRGB();
}
return img.getRGB(x, y);
}
private static int getActualPixel(BufferedImage img, int x, int y) {
if (x >= img.getWidth() ||
y >= img.getHeight()) {
return Color.CYAN.getRGB();
}
return img.getRGB(x, y);
}
// The following code is by Github user red6, from the excellent PDFCompare library
private static int getElement(final int expectedElement, final int actualElement) {
if (expectedElement != actualElement) {
int expectedDarkness = calcCombinedIntensity(expectedElement);
int actualDarkness = calcCombinedIntensity(actualElement);
if (expectedDarkness > actualDarkness) {
return color(levelIntensity(expectedDarkness, 210), 0, 0);
} else {
return color(0, levelIntensity(actualDarkness, 180), 0);
}
} else {
return fadeElement(expectedElement);
}
}
/**
* Levels the color intensity to at least 50 and at most maxIntensity.
*
* @param darkness color component to level
* @param maxIntensity highest possible intensity cut off
* @return A value that is at least 50 and at most maxIntensity
*/
private static int levelIntensity(final int darkness, final int maxIntensity) {
return Math.min(maxIntensity, Math.max(50, darkness));
}
/**
* Calculate the combined intensity of a pixel and normalizes it to a value of at most 255.
*/
private static int calcCombinedIntensity(final int element) {
final Color color = new Color(element);
return Math.min(255, (color.getRed() + color.getGreen() + color.getRed()) / 3);
}
private static int color(final int r, final int g, final int b) {
return new Color(r, g, b).getRGB();
}
private static int fadeElement(final int i) {
final Color color = new Color(i);
return new Color(fade(color.getRed()), fade(color.getGreen()), fade(color.getBlue())).getRGB();
}
private static int fade(final int i) {
return i + ((255 - i) * 3 / 5);
}
}