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[bug-66278] Bug with multiple gradient stops at the exact same location causing a rendering failure (AWT -> not enough colors in gradient). Thanks to Gareth Floodgate. This closes #385 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1904301 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
PJ Fanning 2022-09-27 12:09:11 +00:00
parent 1a3a5db2fe
commit acd5d04daa
3 changed files with 138 additions and 26 deletions
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98
poi-ooxml/src/test/java/org/apache/poi/xslf/TestXSLFBugs.java
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@ -25,6 +25,11 @@ import static org.junit.jupiter.api.Assertions.*;
import static org.junit.jupiter.api.Assumptions.assumeFalse;
import java.awt.Color;
import java.awt.LinearGradientPaint;
import java.awt.MultipleGradientPaint;
import java.awt.Paint;
import java.awt.RadialGradientPaint;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.File;
import java.io.FileInputStream;
@ -1120,4 +1125,97 @@ class TestXSLFBugs {
}
}
}
@Test
void identicalGradientStopsBug() throws IOException {
final ArrayList<LinearGradientPaint> linearGradients = new ArrayList<>();
final ArrayList<RadialGradientPaint> radialGradients = new ArrayList<>();
final DummyGraphics2d dgfx = new DummyGraphics2d(new NullPrintStream())
{
public void setPaint(final Paint paint) {
if (paint instanceof LinearGradientPaint) {
linearGradients.add((LinearGradientPaint) paint);
}
if (paint instanceof RadialGradientPaint) {
radialGradients.add((RadialGradientPaint) paint);
}
}
};
final List<LinearGradientPaint> expectedLinearGradients = Arrays.asList(
new LinearGradientPaint(new Point2D.Double(30.731732283464567, 138.7317322834646),
new Point2D.Double(122.91549846753813, 46.54796609939099),
new float[] { 0.0f, 0.99999994f, 1.0f },
new Color[] { new Color(81, 124, 252, 255),
new Color(81, 124, 252, 255),
new Color(17,21,27, 204) }),
new LinearGradientPaint(new Point2D.Double(174.7317322834646, 138.73173228346457),
new Point2D.Double(266.9154984675381, 46.547966099391004),
new float[] { 0.0f, 0.00000005f, 1.0f },
new Color[] { new Color(17,21,27, 204),
new Color(81, 124, 252, 255),
new Color(81, 124, 252, 255) }),
new LinearGradientPaint(new Point2D.Double(318.73173228346457, 138.73173228346462),
new Point2D.Double(410.9154984675381, 46.547966099391004),
new float[] { 0.0f, 0.5f, 0.50000006f, 1.0f },
new Color[] { new Color(17,21,27, 204),
new Color(17,21,27, 204),
new Color(81, 124, 252, 255),
new Color(81, 124, 252, 255) })
);
final List<RadialGradientPaint> expectedRadialGradients = Arrays.asList(
new RadialGradientPaint(new Point2D.Double(30.731732283464567, 138.7317322834646),
108.0f, new Point2D.Double(122.91549846753813, 46.54796609939099),
new float[] { 0.0f, 0.5f, 0.50000006f, 1.0f },
new Color[] { new Color(17,21,27, 204),
new Color(17,21,27, 204),
new Color(81, 124, 252, 255),
new Color(81, 124, 252, 255) },
MultipleGradientPaint.CycleMethod.NO_CYCLE),
new RadialGradientPaint(new Point2D.Double(228.73173228346457, 226.9755905511811),
108.0f, new Point2D.Double(282.73173228346457, 280.9755905511811),
new float[] { 0.0f, 0.00000005f, 1.0f },
new Color[] { new Color(17,21,27, 204),
new Color(81, 124, 252, 255),
new Color(81, 124, 252, 255) },
MultipleGradientPaint.CycleMethod.NO_CYCLE),
new RadialGradientPaint(new Point2D.Double(84.73173228346457, 226.9755905511811),
108.0f, new Point2D.Double(138.73173228346457, 280.9755905511811),
new float[] { 0.0f, 0.99999994f, 1.0f },
new Color[] { new Color(81, 124, 252, 255),
new Color(81, 124, 252, 255),
new Color(17,21,27, 204) },
MultipleGradientPaint.CycleMethod.NO_CYCLE)
);
try (XMLSlideShow slideShowModel = openSampleDocument("minimal-gradient-fill-issue.pptx")) {
// Render the first (and only) slide.
slideShowModel.getSlides().get(0).draw(dgfx);
// Test that the linear gradients have the expected data (stops modified)
assertEquals(3, linearGradients.size());
for (int i = 0 ; i < expectedLinearGradients.size() ; i++) {
final LinearGradientPaint expected = expectedLinearGradients.get(i);
final LinearGradientPaint actual = linearGradients.get(i);
assertEquals(expected.getStartPoint(), expected.getStartPoint());
assertEquals(expected.getEndPoint(), expected.getEndPoint());
assertArrayEquals(expected.getFractions(), actual.getFractions());
assertArrayEquals(expected.getColors(), actual.getColors());
}
// Test that the radial gradients have the expected data (stops modified)
assertEquals(3, radialGradients.size());
for (int i = 0 ; i < expectedRadialGradients.size() ; i++) {
final RadialGradientPaint expected = expectedRadialGradients.get(i);
final RadialGradientPaint actual = radialGradients.get(i);
assertEquals(expected.getCenterPoint(), expected.getCenterPoint());
assertEquals(expected.getFocusPoint(), expected.getFocusPoint());
assertArrayEquals(expected.getFractions(), actual.getFractions());
assertArrayEquals(expected.getColors(), actual.getColors());
}
}
}
}

16
poi/src/main/java/org/apache/poi/sl/draw/DrawPaint.java
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@ -613,7 +613,21 @@ public class DrawPaint {
// need to remap the fractions, because Java doesn't like repeating fraction values
Map<Float,Color> m = new TreeMap<>();
for (float fraction : fill.getGradientFractions()) {
m.put(fraction, styles.next());
float gradientFraction = fraction;
// Multiple gradient stops at the same location
// can lead to failure when creating AWT gradient, especially
// if there are only two stops and they are both on the exact
// same location.
// (The example of (only) 2 stops at exactly the same location will cause:
// java.lang.IllegalArgumentException: User must specify at least 2 colors).
//
// To fix this we nudge the stop a teeny tiny bit.
if (m.containsKey(gradientFraction)) {
gradientFraction += (gradientFraction == 1.0 ? -1.0 : 1.0) * 0.00000005;
}
m.put(gradientFraction, styles.next());
}
return init.apply(toArray(m.keySet()), m.values().toArray(new Color[0]));

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test-data/slideshow/minimal-gradient-fill-issue.pptx Normal file
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