private static Kdu_coords getReferenceExpansion(
int reference_component, Kdu_channel_mapping channels, Kdu_codestream codestream)
throws KduException {
int c;
Kdu_coords ref_subs = new Kdu_coords();
Kdu_coords subs = new Kdu_coords();
codestream.Get_subsampling(reference_component, ref_subs);
Kdu_coords min_subs = new Kdu_coords();
min_subs.Assign(ref_subs);
for (c = 0; c < channels.Get_num_channels(); c++) {
codestream.Get_subsampling(channels.Get_source_component(c), subs);
if (subs.Get_x() < min_subs.Get_x()) min_subs.Set_x(subs.Get_x());
if (subs.Get_y() < min_subs.Get_y()) min_subs.Set_y(subs.Get_y());
}
Kdu_coords expansion = new Kdu_coords();
expansion.Set_x(ref_subs.Get_x() / min_subs.Get_x());
expansion.Set_y(ref_subs.Get_y() / min_subs.Get_y());
for (c = 0; c < channels.Get_num_channels(); c++) {
codestream.Get_subsampling(channels.Get_source_component(c), subs);
if ((((subs.Get_x() * expansion.Get_x()) % ref_subs.Get_x()) != 0)
|| (((subs.Get_y() * expansion.Get_y()) % ref_subs.Get_y()) != 0)) {
Kdu_global.Kdu_print_error(
"The supplied JP2 file contains color channels "
+ "whose sub-sampling factors are not integer "
+ "multiples of one another.");
codestream.Apply_input_restrictions(
0, 1, 0, 0, null, Kdu_global.KDU_WANT_OUTPUT_COMPONENTS);
channels.Configure(codestream);
expansion = new Kdu_coords(1, 1);
}
}
return expansion;
}
public BufferedImage extract() throws DjatokaException {
boolean useRegion = false;
int left = 0;
int top = 0;
int width = 50;
int height = 50;
boolean useleftDouble = false;
Double leftDouble = 0.0;
boolean usetopDouble = false;
Double topDouble = 0.0;
boolean usewidthDouble = false;
Double widthDouble = 0.0;
boolean useheightDouble = false;
Double heightDouble = 0.0;
if (params.getRegion() != null) {
StringTokenizer st = new StringTokenizer(params.getRegion(), "{},");
String token;
// top
if ((token = st.nextToken()).contains(".")) {
topDouble = Double.parseDouble(token);
usetopDouble = true;
} else top = Integer.parseInt(token);
// left
if ((token = st.nextToken()).contains(".")) {
leftDouble = Double.parseDouble(token);
useleftDouble = true;
} else left = Integer.parseInt(token);
// height
if ((token = st.nextToken()).contains(".")) {
heightDouble = Double.parseDouble(token);
useheightDouble = true;
} else height = Integer.parseInt(token);
// width
if ((token = st.nextToken()).contains(".")) {
widthDouble = Double.parseDouble(token);
usewidthDouble = true;
} else width = Integer.parseInt(token);
useRegion = true;
}
try {
if (is != null) {
File f = File.createTempFile("tmp", ".jp2");
f.deleteOnExit();
FileOutputStream fos = new FileOutputStream(f);
sourceFile = f.getAbsolutePath();
IOUtils.copyStream(is, fos);
is.close();
fos.close();
}
} catch (IOException e) {
throw new DjatokaException(e);
}
try {
Jp2_source inputSource = new Jp2_source();
Kdu_compressed_source input = null;
Jp2_family_src jp2_family_in = new Jp2_family_src();
Jp2_locator loc = new Jp2_locator();
jp2_family_in.Open(sourceFile, true);
inputSource.Open(jp2_family_in, loc);
inputSource.Read_header();
input = inputSource;
Kdu_codestream codestream = new Kdu_codestream();
codestream.Create(input);
Kdu_channel_mapping channels = new Kdu_channel_mapping();
if (inputSource.Exists()) channels.Configure(inputSource, false);
else channels.Configure(codestream);
int ref_component = channels.Get_source_component(0);
Kdu_coords ref_expansion = getReferenceExpansion(ref_component, channels, codestream);
Kdu_dims image_dims = new Kdu_dims();
codestream.Get_dims(ref_component, image_dims);
Kdu_coords imageSize = image_dims.Access_size();
Kdu_coords imagePosition = image_dims.Access_pos();
if (useleftDouble)
left = imagePosition.Get_x() + (int) Math.round(leftDouble * imageSize.Get_x());
if (usetopDouble)
top = imagePosition.Get_y() + (int) Math.round(topDouble * imageSize.Get_y());
if (useheightDouble) height = (int) Math.round(heightDouble * imageSize.Get_y());
if (usewidthDouble) width = (int) Math.round(widthDouble * imageSize.Get_x());
if (useRegion) {
imageSize.Set_x(width);
imageSize.Set_y(height);
imagePosition.Set_x(left);
imagePosition.Set_y(top);
}
int reduce = 1 << params.getLevelReductionFactor();
imageSize.Set_x(imageSize.Get_x() * ref_expansion.Get_x());
imageSize.Set_y(imageSize.Get_y() * ref_expansion.Get_y());
imagePosition.Set_x(
imagePosition.Get_x() * ref_expansion.Get_x() / reduce
- ((ref_expansion.Get_x() / reduce - 1) / 2));
imagePosition.Set_y(
imagePosition.Get_y() * ref_expansion.Get_y() / reduce
- ((ref_expansion.Get_y() / reduce - 1) / 2));
Kdu_dims view_dims = new Kdu_dims();
view_dims.Assign(image_dims);
view_dims.Access_size().Set_x(imageSize.Get_x());
view_dims.Access_size().Set_y(imageSize.Get_y());
int region_buf_size = imageSize.Get_x() * imageSize.Get_y();
int[] region_buf = new int[region_buf_size];
Kdu_region_decompressor decompressor = new Kdu_region_decompressor();
decompressor.Start(
codestream,
channels,
-1,
params.getLevelReductionFactor(),
16384,
image_dims,
ref_expansion,
new Kdu_coords(1, 1),
false,
Kdu_global.KDU_WANT_OUTPUT_COMPONENTS);
Kdu_dims new_region = new Kdu_dims();
Kdu_dims incomplete_region = new Kdu_dims();
Kdu_coords viewSize = view_dims.Access_size();
incomplete_region.Assign(image_dims);
int[] imgBuffer = new int[viewSize.Get_x() * viewSize.Get_y()];
int[] kduBuffer = null;
while (decompressor.Process(
region_buf,
image_dims.Access_pos(),
0,
0,
region_buf_size,
incomplete_region,
new_region)) {
Kdu_coords newOffset = new_region.Access_pos();
Kdu_coords newSize = new_region.Access_size();
newOffset.Subtract(view_dims.Access_pos());
kduBuffer = region_buf;
int imgBuffereIdx = newOffset.Get_x() + newOffset.Get_y() * viewSize.Get_x();
int kduBufferIdx = 0;
int xDiff = viewSize.Get_x() - newSize.Get_x();
for (int j = 0; j < newSize.Get_y(); j++, imgBuffereIdx += xDiff) {
for (int i = 0; i < newSize.Get_x(); i++) {
imgBuffer[imgBuffereIdx++] = kduBuffer[kduBufferIdx++];
}
}
}
BufferedImage image =
new BufferedImage(imageSize.Get_x(), imageSize.Get_y(), BufferedImage.TYPE_INT_RGB);
image.setRGB(0, 0, viewSize.Get_x(), viewSize.Get_y(), imgBuffer, 0, viewSize.Get_x());
if (params.getRotationDegree() > 0) {
image = ImageProcessingUtils.rotate(image, params.getRotationDegree());
}
decompressor.Native_destroy();
channels.Native_destroy();
if (codestream.Exists()) codestream.Destroy();
inputSource.Native_destroy();
input.Native_destroy();
jp2_family_in.Native_destroy();
return image;
} catch (KduException e) {
e.printStackTrace();
throw new DjatokaException(e);
} catch (Exception e) {
e.printStackTrace();
throw new DjatokaException(e);
}
}