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#707 WebP: Fix Alpha support

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(cherry picked from commit 8f44cfc43c9b81e41b8ed34bbc957ac05793c419)
This commit is contained in:
Harald Kuhr 2022-10-20 16:00:12 +02:00
parent 055838aaaf
commit 5d623cce9f
2 changed files with 33 additions and 12 deletions
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8
imageio/imageio-webp/src/main/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReader.java
View File

@ -511,16 +511,16 @@ final class WebPImageReader extends ImageReaderBase {
}
private void readAlpha(BufferedImage destination, ImageReadParam param, final int width, final int height) throws IOException {
int compression = (int) lsbBitReader.readBits(2);
int filtering = (int) lsbBitReader.readBits(2);
int reserved = (int) lsbBitReader.readBits(2);
int preProcessing = (int) lsbBitReader.readBits(2);
if (reserved != 0) {
// Spec says SHOULD be 0
processWarningOccurred(String.format("Unexpected 'ALPH' chunk reserved value, expected 0: %d", reserved));
}
int preProcessing = (int) lsbBitReader.readBits(2);
int filtering = (int) lsbBitReader.readBits(2);
int compression = (int) lsbBitReader.readBits(2);
if (DEBUG) {
System.out.println("preProcessing: " + preProcessing);
System.out.println("filtering: " + filtering);

37
imageio/imageio-webp/src/test/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReaderTest.java
View File

@ -1,11 +1,8 @@
package com.twelvemonkeys.imageio.plugins.webp;
import static java.util.Arrays.asList;
import com.twelvemonkeys.imageio.util.ImageReaderAbstractTest;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.List;
import org.junit.Test;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
@ -13,10 +10,13 @@ import javax.imageio.ImageTypeSpecifier;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;
import java.awt.*;
import java.awt.image.*;
import java.io.IOException;
import java.util.List;
import org.junit.Test;
import com.twelvemonkeys.imageio.util.ImageReaderAbstractTest;
import static java.util.Arrays.asList;
import static org.junit.Assert.assertEquals;
/**
* WebPImageReaderTest
@ -141,4 +141,25 @@ public class WebPImageReaderTest extends ImageReaderAbstractTest<WebPImageReader
reader.dispose();
}
}
@Test
public void testReadAlphaTransparent() throws IOException {
WebPImageReader reader = createReader();
try (ImageInputStream stream = ImageIO.createImageInputStream(getClassLoaderResource("/webp/1_webp_a.webp"))) {
reader.setInput(stream);
BufferedImage image = reader.read(0);
assertEquals(Transparency.TRANSLUCENT, image.getTransparency());
assertRGBEquals("Expected transparent corner (0, 0)", 0x00000000, image.getRGB(0, 0) & 0xFF000000, 8);
assertRGBEquals("Expected opaque center (200, 150)", 0xff9a4e01, image.getRGB(200, 150), 8);
assertRGBEquals("Expected transparent corner (399, 0)", 0x00000000, image.getRGB(399, 0) & 0xFF000000, 8);
assertRGBEquals("Expected transparent corner (0, 300)", 0x00000000, image.getRGB(0, 300) & 0xFF000000, 8);
assertRGBEquals("Expected transparent corner (399, 300)", 0x00000000, image.getRGB(399, 300) & 0xFF000000, 8);
}
finally {
reader.dispose();
}
}
}