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TMI-62: Faster reading of short and integer rasters.

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This commit is contained in:
Harald Kuhr 2014-09-10 21:34:07 +02:00
parent 2fb9a54618
commit 3e0440b9f4
1 changed files with 28 additions and 6 deletions
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34
imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageReader.java
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@ -1071,9 +1071,7 @@ public class TIFFImageReader extends ImageReaderBase {
break; // We're done with this tile
}
for (int k = 0; k < rowDataShort.length; k++) {
rowDataShort[k] = input.readShort();
}
readFully(input, rowDataShort);
if (row >= srcRegion.y) {
normalizeBlack(interpretation, rowDataShort);
@ -1101,9 +1099,7 @@ public class TIFFImageReader extends ImageReaderBase {
break; // We're done with this tile
}
for (int k = 0; k < rowDataInt.length; k++) {
rowDataInt[k] = input.readInt();
}
readFully(input, rowDataInt);
if (row >= srcRegion.y) {
normalizeBlack(interpretation, rowDataInt);
@ -1126,6 +1122,32 @@ public class TIFFImageReader extends ImageReaderBase {
}
}
// TODO: Candidate util method (with off/len + possibly byte order)
private void readFully(final DataInput input, final int[] rowDataInt) throws IOException {
if (input instanceof ImageInputStream) {
ImageInputStream imageInputStream = (ImageInputStream) input;
imageInputStream.readFully(rowDataInt, 0, rowDataInt.length);
}
else {
for (int k = 0; k < rowDataInt.length; k++) {
rowDataInt[k] = input.readInt();
}
}
}
// TODO: Candidate util method (with off/len + possibly byte order)
private void readFully(final DataInput input, final short[] rowDataShort) throws IOException {
if (input instanceof ImageInputStream) {
ImageInputStream imageInputStream = (ImageInputStream) input;
imageInputStream.readFully(rowDataShort, 0, rowDataShort.length);
}
else {
for (int k = 0; k < rowDataShort.length; k++) {
rowDataShort[k] = input.readShort();
}
}
}
private void normalizeBlack(int photometricInterpretation, short[] data) {
if (photometricInterpretation == TIFFBaseline.PHOTOMETRIC_WHITE_IS_ZERO) {
// Inverse values