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Avoid creating another temporary raster, filtering on the tempRaster.

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(cherry picked from commit 34e8d8800733d2e7a0b81717273dc55536dce54b)
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tc-wleite 2023-03-15 17:23:53 -03:00 committed by Harald Kuhr
parent 3cee4d0112
commit bf55209bf6
1 changed files with 9 additions and 9 deletions
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18
imageio/imageio-webp/src/main/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReader.java
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@ -529,8 +529,7 @@ final class WebPImageReader extends ImageReaderBase {
System.out.println("compression: " + compression);
}
// Alpha raster must have same dimensions as the source, because of gradient filtering.
WritableRaster alphaRaster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE, width, height, 1, null);
WritableRaster alphaRaster = destination.getAlphaRaster();
switch (compression) {
case 0:
readUncompressedAlpha(alphaRaster);
@ -539,30 +538,31 @@ final class WebPImageReader extends ImageReaderBase {
// Simulate header
imageInput.seek(imageInput.getStreamPosition() - 5);
// Temp alpha raster must have same dimensions as the source, because of filtering.
WritableRaster tempRaster = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE, width, height, 4, null);
readVP8Lossless(tempRaster, null, width, height);
// Copy from green (band 1) in temp to alpha in destination
alphaRaster.setRect(tempRaster.createChild(0, 0, tempRaster.getWidth(), tempRaster.getHeight(), 0, 0, new int[] {1}));
WritableRaster alphaChannel = tempRaster.createWritableChild(0, 0, tempRaster.getWidth(), tempRaster.getHeight(), 0, 0, new int[]{1});
alphaFilter(alphaChannel, filtering);
copyIntoRasterWithParams(alphaChannel, alphaRaster, param);
break;
default:
processWarningOccurred("Unknown WebP alpha compression: " + compression);
opaqueAlpha(alphaRaster);
break;
}
}
private void alphaFilter(WritableRaster alphaRaster, int filtering) {
if (filtering != AlphaFiltering.NONE) {
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
for (int y = 0; y < alphaRaster.getHeight(); y++) {
for (int x = 0; x < alphaRaster.getWidth(); x++) {
int predictorAlpha = getPredictorAlpha(alphaRaster, filtering, y, x);
alphaRaster.setSample(x, y, 0, alphaRaster.getSample(x, y, 0) + predictorAlpha % 256);
}
}
}
// Copy into destination raster
WritableRaster dstRaster = destination.getAlphaRaster();
copyIntoRasterWithParams(alphaRaster, dstRaster, param);
}
private int getPredictorAlpha(WritableRaster alphaRaster, int filtering, int y, int x) {