in src/main/java/org/apache/commons/imaging/formats/tiff/datareaders/DataReaderTiled.java [73:199]
private void interpretTile(final ImageBuilder imageBuilder, final byte[] bytes, final int startX, final int startY, final int xLimit, final int yLimit)
throws ImagingException, IOException {
// March 2020 change to handle floating-point with compression
// for the compressed floating-point, there is a standard that allows
// 16 bit floats (which is an IEEE 754 standard) and 24 bits (which is
// a non-standard format implemented for TIFF). At this time, this
// code only supports the 32-bit and 64-bit formats.
if (sampleFormat == TiffTagConstants.SAMPLE_FORMAT_VALUE_IEEE_FLOATING_POINT) {
// tileLength: number of rows in tile
// tileWidth: number of columns in tile
final int i0 = startY;
int i1 = startY + tileLength;
if (i1 > yLimit) {
// the tile is padded past bottom of image
i1 = yLimit;
}
final int j0 = startX;
int j1 = startX + tileWidth;
if (j1 > xLimit) {
// the tile is padded to beyond the tile width
j1 = xLimit;
}
final int[] samples = new int[4];
final int[] b = unpackFloatingPointSamples(j1 - j0, i1 - i0, tileWidth, bytes, bitsPerPixel, byteOrder);
for (int i = i0; i < i1; i++) {
final int row = i - startY;
final int rowOffset = row * tileWidth;
for (int j = j0; j < j1; j++) {
final int column = j - startX;
final int k = (rowOffset + column) * samplesPerPixel;
samples[0] = b[k];
photometricInterpreter.interpretPixel(imageBuilder, samples, j, i);
}
}
return;
}
// End of March 2020 changes to support floating-point format
// changes introduced May 2012
// The following block of code implements changes that
// reduce image loading time by using special-case processing
// instead of the general-purpose logic from the original
// implementation. For a detailed discussion, see the comments for
// a similar treatment in the DataReaderStrip class
//
// verify that all samples are one byte in size
final boolean allSamplesAreOneByte = isHomogenous(8);
if ((bitsPerPixel == 24 || bitsPerPixel == 32) && allSamplesAreOneByte && photometricInterpreter instanceof PhotometricInterpreterRgb) {
int i1 = startY + tileLength;
if (i1 > yLimit) {
// the tile is padded past bottom of image
i1 = yLimit;
}
int j1 = startX + tileWidth;
if (j1 > xLimit) {
// the tile is padded to beyond the tile width
j1 = xLimit;
}
if (predictor == TiffTagConstants.PREDICTOR_VALUE_HORIZONTAL_DIFFERENCING) {
applyPredictorToBlock(tileWidth, i1 - startY, samplesPerPixel, bytes);
}
if (bitsPerPixel == 24) {
// 24 bit case, we don't mask the red byte because any
// sign-extended bits get covered by opacity mask
for (int i = startY; i < i1; i++) {
int k = (i - startY) * tileWidth * 3;
for (int j = startX; j < j1; j++, k += 3) {
final int rgb = 0xff000000 | bytes[k] << 16 | (bytes[k + 1] & 0xff) << 8 | bytes[k + 2] & 0xff;
imageBuilder.setRgb(j, i, rgb);
}
}
} else if (bitsPerPixel == 32) {
// 32 bit case, we don't mask the high byte because any
// sign-extended bits get shifted up and out of result.
for (int i = startY; i < i1; i++) {
int k = (i - startY) * tileWidth * 4;
for (int j = startX; j < j1; j++, k += 4) {
final int rgb = (bytes[k] & 0xff) << 16 | (bytes[k + 1] & 0xff) << 8 | bytes[k + 2] & 0xff | bytes[k + 3] << 24;
imageBuilder.setRgb(j, i, rgb);
}
}
}
return;
}
// End of May 2012 changes
try (BitInputStream bis = new BitInputStream(new ByteArrayInputStream(bytes), byteOrder)) {
final int pixelsPerTile = tileWidth * tileLength;
int tileX = 0;
int tileY = 0;
int[] samples = Allocator.intArray(bitsPerSampleLength);
resetPredictor();
for (int i = 0; i < pixelsPerTile; i++) {
final int x = tileX + startX;
final int y = tileY + startY;
getSamplesAsBytes(bis, samples);
if (x < xLimit && y < yLimit) {
samples = applyPredictor(samples);
photometricInterpreter.interpretPixel(imageBuilder, samples, x, y);
}
tileX++;
if (tileX >= tileWidth) {
tileX = 0;
resetPredictor();
tileY++;
bis.flushCache();
if (tileY >= tileLength) {
break;
}
}
}
}
}