public static boolean convert(
byte[] objectData,
ImageData imageData,
GenericColorSpace decodeColorData,
PdfObject newSMask,
PdfObjectReader currentPdfFile)
throws PdfException {
newSMask.setFloatArray(PdfDictionary.Decode, new float[] {1, 0});
final PdfArrayIterator Filters = newSMask.getMixedArray(PdfDictionary.Filter);
boolean isMaskJPX = false;
// check not handled elsewhere
int firstValue;
if (Filters != null && Filters.hasMoreTokens()) {
while (Filters.hasMoreTokens()) {
firstValue = Filters.getNextValueAsConstant(true);
// isDCT=firstValue==PdfFilteredReader.DCTDecode;
isMaskJPX = firstValue == PdfFilteredReader.JPXDecode;
}
}
byte[] objData = currentPdfFile.readStream(newSMask, true, true, false, false, false, null);
imageData.setObjectData(objData);
imageData.setDepth(1);
imageData.setWidth(newSMask.getInt(PdfDictionary.Width));
imageData.setHeight(newSMask.getInt(PdfDictionary.Height));
int newDepth = newSMask.getInt(PdfDictionary.BitsPerComponent);
// JPEG2000 causes us special difficulties as we not actually decoding objectData because
// it is JPEG2000 and we decode as part of image handling because Java does byte[] to image
// directly
//
// This code fixes specific example by getting the actual data and ignoring empty mask but will
// probably need developing further if we find other examples
if (isMaskJPX) { // see case 17665 for example
BufferedImage img =
decodeColorData.JPEG2000ToRGBImage(
imageData.getObjectData(),
imageData.getWidth(),
imageData.getHeight(),
null,
-1,
-1,
8);
img = ColorSpaceConvertor.convertColorspace(img, 10);
objData = ((DataBufferByte) img.getRaster().getDataBuffer()).getData();
imageData.setObjectData(objData);
boolean isEmptyMask = true;
for (final byte b : objectData) {
if (b != 0) {
isEmptyMask = false;
break;
}
}
if (isEmptyMask) {
imageData.setObjectData(null);
}
// we need to unset this as e have handled the JPX filter
newSMask.setMixedArray(PdfDictionary.Filter, null);
}
if (newDepth != PdfDictionary.Unknown) {
imageData.setDepth(newDepth);
}
return objData == null;
}
static GenericColorSpace downSample(
ImageData imageData, GenericColorSpace decodeColorData, int sampling, byte[] index) {
final boolean hasIndex =
decodeColorData.getIndexedMap() != null
&& (decodeColorData.getID() == ColorSpaces.DeviceRGB
|| decodeColorData.getID() == ColorSpaces.CalRGB
|| decodeColorData.getID() == ColorSpaces.DeviceCMYK
|| decodeColorData.getID() == ColorSpaces.ICC
|| decodeColorData.getID() == ColorSpaces.DeviceN);
int comp;
int indexCount = 1;
if (hasIndex) { // convert to sRGB
comp = 1;
imageData.setCompCount(3);
indexCount = 3;
index = decodeColorData.convertIndexToRGB(index);
// actually sRGB now so reset colorspace
decodeColorData = new DeviceRGBColorSpace();
} else {
comp = decodeColorData.getColorComponentCount();
}
int newW = imageData.getWidth() / sampling;
int newH = imageData.getHeight() / sampling;
byte[] data = imageData.getObjectData();
final int oldSize = data.length;
int x, y, xx, yy, jj;
int origLineLength;
// black and white
if (imageData.getWidth() * imageData.getHeight() == oldSize
|| decodeColorData.getID() == ColorSpaces.DeviceGray) {
comp = 1;
}
final byte[] newData;
if (hasIndex) { // hard-coded to 3 values
newData = new byte[newW * newH * indexCount];
origLineLength = imageData.getWidth();
} else {
newData = new byte[newW * newH * comp];
origLineLength = imageData.getWidth() * comp;
}
// scan all pixels and down-sample
for (y = 0; y < newH; y++) {
for (x = 0; x < newW; x++) {
// allow for edges in number of pixels left
int wCount = sampling, hCount = sampling;
final int wGapLeft = imageData.getWidth() - x;
final int hGapLeft = imageData.getHeight() - y;
if (wCount > wGapLeft) {
wCount = wGapLeft;
}
if (hCount > hGapLeft) {
hCount = hGapLeft;
}
int[] indexAv;
for (jj = 0; jj < comp; jj++) {
int byteTotal = 0;
int count = 0;
int ptr;
final int newPtr;
//noinspection ObjectAllocationInLoop
indexAv = new int[indexCount];
// count pixels in sample we will make into a pixel (ie 2x2 is 4 pixels , 4x4 is 16
// pixels)
for (yy = 0; yy < hCount; yy++) {
for (xx = 0; xx < wCount; xx++) {
ptr =
((yy + (y * sampling)) * origLineLength)
+ (((x * sampling * comp) + (xx * comp) + jj));
if (ptr < oldSize) {
if (!hasIndex) {
byteTotal += (data[ptr] & 255);
} else {
for (int aa = 0; aa < indexCount; aa++) {
indexAv[aa] += (index[(((data[ptr] & 255) * indexCount) + aa)] & 255);
}
}
count++;
}
}
}
// set value as white or average of pixels
if (hasIndex) {
newPtr = jj + (x * indexCount) + (newW * y * indexCount);
for (int aa = 0; aa < indexCount; aa++) {
newData[newPtr + aa] = (byte) ((indexAv[aa]) / count);
}
} else if (count > 0) {
newPtr = jj + (x * comp) + (newW * y * comp);
newData[newPtr] = (byte) ((byteTotal) / count);
}
}
}
}
imageData.setObjectData(newData);
imageData.setWidth(newW);
imageData.setHeight(newH);
return decodeColorData;
}