| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.pdfbox.jbig2.segments; |
| |
| import java.io.IOException; |
| |
| import org.apache.pdfbox.jbig2.Bitmap; |
| import org.apache.pdfbox.jbig2.Region; |
| import org.apache.pdfbox.jbig2.SegmentHeader; |
| import org.apache.pdfbox.jbig2.decoder.arithmetic.ArithmeticDecoder; |
| import org.apache.pdfbox.jbig2.decoder.arithmetic.CX; |
| import org.apache.pdfbox.jbig2.decoder.mmr.MMRDecompressor; |
| import org.apache.pdfbox.jbig2.err.InvalidHeaderValueException; |
| import org.apache.pdfbox.jbig2.io.SubInputStream; |
| |
| /** |
| * This class represents a generic region segment.<br> |
| * Parsing is done as described in 7.4.5.<br> |
| * Decoding procedure is done as described in 6.2.5.7 and 7.4.6.4. |
| */ |
| public class GenericRegion implements Region |
| { |
| private SubInputStream subInputStream; |
| private long dataHeaderOffset; |
| private long dataHeaderLength; |
| private long dataOffset; |
| private long dataLength; |
| |
| /** Region segment information field, 7.4.1 */ |
| private RegionSegmentInformation regionInfo; |
| |
| /** Generic region segment flags, 7.4.6.2 */ |
| private boolean useExtTemplates; |
| private boolean isTPGDon; |
| private byte gbTemplate; |
| private boolean isMMREncoded; |
| |
| /** Generic region segment AT flags, 7.4.6.3 */ |
| private short[] gbAtX; |
| private short[] gbAtY; |
| private boolean[] gbAtOverride; |
| |
| /** |
| * If true, AT pixels are not on their nominal location and have to be overridden |
| */ |
| private boolean override; |
| |
| /** Decoded data as pixel values (use row stride/width to wrap line) */ |
| private Bitmap regionBitmap; |
| |
| private ArithmeticDecoder arithDecoder; |
| private CX cx; |
| |
| private MMRDecompressor mmrDecompressor; |
| |
| private boolean useSkip = false; |
| private Bitmap hSkip = null; |
| |
| public GenericRegion() |
| { |
| } |
| |
| public GenericRegion(final SubInputStream subInputStream) |
| { |
| this.subInputStream = subInputStream; |
| this.regionInfo = new RegionSegmentInformation(subInputStream); |
| } |
| |
| private void parseHeader() throws IOException, InvalidHeaderValueException |
| { |
| regionInfo.parseHeader(); |
| |
| /* Bit 5-7 */ |
| subInputStream.readBits(3); // Dirty read... |
| |
| /* Bit 4 */ |
| if (subInputStream.readBit() == 1) |
| { |
| useExtTemplates = true; |
| } |
| |
| /* Bit 3 */ |
| if (subInputStream.readBit() == 1) |
| { |
| isTPGDon = true; |
| } |
| |
| /* Bit 1-2 */ |
| gbTemplate = (byte) (subInputStream.readBits(2) & 0xf); |
| |
| /* Bit 0 */ |
| if (subInputStream.readBit() == 1) |
| { |
| isMMREncoded = true; |
| } |
| |
| if (!isMMREncoded) |
| { |
| final int amountOfGbAt; |
| if (gbTemplate == 0) |
| { |
| if (useExtTemplates) |
| { |
| amountOfGbAt = 12; |
| } |
| else |
| { |
| amountOfGbAt = 4; |
| } |
| } |
| else |
| { |
| amountOfGbAt = 1; |
| } |
| |
| readGbAtPixels(amountOfGbAt); |
| } |
| |
| /* Segment data structure */ |
| computeSegmentDataStructure(); |
| } |
| |
| private void readGbAtPixels(final int amountOfGbAt) throws IOException |
| { |
| gbAtX = new short[amountOfGbAt]; |
| gbAtY = new short[amountOfGbAt]; |
| |
| for (int i = 0; i < amountOfGbAt; i++) |
| { |
| gbAtX[i] = subInputStream.readByte(); |
| gbAtY[i] = subInputStream.readByte(); |
| } |
| } |
| |
| private void computeSegmentDataStructure() throws IOException |
| { |
| dataOffset = subInputStream.getStreamPosition(); |
| dataHeaderLength = dataOffset - dataHeaderOffset; |
| dataLength = subInputStream.length() - dataHeaderLength; |
| } |
| |
| /** |
| * The procedure is described in 6.2.5.7, page 17. |
| * |
| * @return The decoded {@link Bitmap} of this region. |
| */ |
| @Override |
| public Bitmap getRegionBitmap() throws IOException |
| { |
| if (null == regionBitmap) |
| { |
| |
| if (isMMREncoded) |
| { |
| |
| /* |
| * MMR DECODER CALL |
| */ |
| if (null == mmrDecompressor) |
| { |
| mmrDecompressor = new MMRDecompressor(regionInfo.getBitmapWidth(), |
| regionInfo.getBitmapHeight(), |
| new SubInputStream(subInputStream, dataOffset, dataLength)); |
| } |
| |
| /* 6.2.6 */ |
| regionBitmap = mmrDecompressor.uncompress(); |
| |
| } |
| else |
| { |
| |
| /* |
| * ARITHMETIC DECODER PROCEDURE for generic region segments |
| */ |
| |
| updateOverrideFlags(); |
| |
| /* 6.2.5.7 - 1) */ |
| int ltp = 0; |
| |
| if (arithDecoder == null) |
| { |
| arithDecoder = new ArithmeticDecoder(subInputStream); |
| } |
| if (cx == null) |
| { |
| cx = new CX(65536, 1); |
| } |
| |
| /* 6.2.5.7 - 2) */ |
| regionBitmap = new Bitmap(regionInfo.getBitmapWidth(), |
| regionInfo.getBitmapHeight()); |
| |
| final int paddedWidth = (regionBitmap.getWidth() + 7) & -8; |
| |
| /* 6.2.5.7 - 3 */ |
| for (int line = 0; line < regionBitmap.getHeight(); line++) |
| { |
| |
| /* 6.2.5.7 - 3 b) */ |
| if (isTPGDon) |
| { |
| ltp ^= decodeSLTP(); |
| } |
| |
| /* 6.2.5.7 - 3 c) */ |
| if (ltp == 1) |
| { |
| if (line > 0) |
| { |
| copyLineAbove(line); |
| } |
| } |
| else |
| { |
| /* 6.2.5.7 - 3 d) */ |
| decodeLine(line, regionBitmap.getWidth(), regionBitmap.getRowStride(), |
| paddedWidth); |
| } |
| } |
| } |
| } |
| |
| // if (JBIG2ImageReader.DEBUG) |
| // if (header != null && header.getSegmentNr() == 3) |
| // new Testbild(gbReg.getByteArray(), (int) gbReg.getWidth(), (int) gbReg.getHeight(), |
| // gbReg.getRowStride()); |
| |
| /* 4 */ |
| return regionBitmap; |
| } |
| |
| private int decodeSLTP() throws IOException |
| { |
| switch (gbTemplate) |
| { |
| case 0: |
| cx.setIndex(0x9b25); |
| break; |
| case 1: |
| cx.setIndex(0x795); |
| break; |
| case 2: |
| cx.setIndex(0xe5); |
| break; |
| case 3: |
| cx.setIndex(0x195); |
| break; |
| } |
| return arithDecoder.decode(cx); |
| } |
| |
| private void decodeLine(final int lineNumber, final int width, final int rowStride, |
| final int paddedWidth) throws IOException |
| { |
| final int byteIndex = regionBitmap.getByteIndex(0, lineNumber); |
| final int idx = byteIndex - rowStride; |
| |
| switch (gbTemplate) |
| { |
| case 0: |
| if (!useExtTemplates) |
| { |
| decodeTemplate0a(lineNumber, width, rowStride, paddedWidth, byteIndex, idx); |
| } |
| else |
| { |
| decodeTemplate0b(lineNumber, width, rowStride, paddedWidth, byteIndex, idx); |
| } |
| break; |
| case 1: |
| decodeTemplate1(lineNumber, width, rowStride, paddedWidth, byteIndex, idx); |
| break; |
| case 2: |
| decodeTemplate2(lineNumber, width, rowStride, paddedWidth, byteIndex, idx); |
| break; |
| case 3: |
| decodeTemplate3(lineNumber, width, rowStride, paddedWidth, byteIndex, idx); |
| break; |
| } |
| } |
| |
| /** |
| * Each pixel gets the value from the corresponding pixel of the row above. Line 0 cannot get copied values (source |
| * will be -1, doesn't exist). |
| * |
| * @param lineNumber - Coordinate of the row that should be set. |
| */ |
| private void copyLineAbove(final int lineNumber) |
| { |
| int targetByteIndex = lineNumber * regionBitmap.getRowStride(); |
| int sourceByteIndex = targetByteIndex - regionBitmap.getRowStride(); |
| |
| for (int i = 0; i < regionBitmap.getRowStride(); i++) |
| { |
| // Get the byte that should be copied and put it into Bitmap |
| regionBitmap.setByte(targetByteIndex++, regionBitmap.getByte(sourceByteIndex++)); |
| } |
| } |
| |
| private void decodeTemplate0a(final int lineNumber, final int width, final int rowStride, |
| final int paddedWidth, int byteIndex, int idx) throws IOException |
| { |
| int context; |
| int overriddenContext = 0; |
| |
| int line1 = 0; |
| int line2 = 0; |
| |
| if (lineNumber >= 1) |
| { |
| line1 = regionBitmap.getByteAsInteger(idx); |
| } |
| |
| if (lineNumber >= 2) |
| { |
| line2 = regionBitmap.getByteAsInteger(idx - rowStride) << 6; |
| } |
| |
| context = (line1 & 0xf0) | (line2 & 0x3800); |
| |
| int nextByte; |
| for (int x = 0; x < paddedWidth; x = nextByte) |
| { |
| /* 6.2.5.7 3d */ |
| byte result = 0; |
| nextByte = x + 8; |
| final int minorWidth = width - x > 8 ? 8 : width - x; |
| |
| if (lineNumber > 0) |
| { |
| line1 = (line1 << 8) |
| | (nextByte < width ? regionBitmap.getByteAsInteger(idx + 1) : 0); |
| } |
| |
| if (lineNumber > 1) |
| { |
| line2 = (line2 << 8) | (nextByte < width |
| ? regionBitmap.getByteAsInteger(idx - rowStride + 1) << 6 : 0); |
| } |
| |
| for (int minorX = 0; minorX < minorWidth; minorX++) |
| { |
| final int toShift = 7 - minorX; |
| if (override) |
| { |
| overriddenContext = overrideAtTemplate0a(context, (x + minorX), lineNumber, |
| result, minorX, toShift); |
| cx.setIndex(overriddenContext); |
| } |
| else |
| { |
| cx.setIndex(context); |
| } |
| |
| final int bit; |
| if (useSkip && hSkip.getPixel(x + minorX, lineNumber) == 1) |
| { |
| bit = 0; |
| } |
| else |
| { |
| bit = arithDecoder.decode(cx); |
| } |
| |
| result |= bit << toShift; |
| |
| context = ((context & 0x7bf7) << 1) | bit | ((line1 >> toShift) & 0x10) |
| | ((line2 >> toShift) & 0x800); |
| } |
| |
| regionBitmap.setByte(byteIndex++, result); |
| idx++; |
| } |
| } |
| |
| private void decodeTemplate0b(final int lineNumber, final int width, final int rowStride, |
| final int paddedWidth, int byteIndex, int idx) throws IOException |
| { |
| int context; |
| int overriddenContext = 0; |
| |
| int line1 = 0; |
| int line2 = 0; |
| |
| if (lineNumber >= 1) |
| { |
| line1 = regionBitmap.getByteAsInteger(idx); |
| } |
| |
| if (lineNumber >= 2) |
| { |
| line2 = regionBitmap.getByteAsInteger(idx - rowStride) << 6; |
| } |
| |
| context = (line1 & 0xf0) | (line2 & 0x3800); |
| |
| int nextByte; |
| for (int x = 0; x < paddedWidth; x = nextByte) |
| { |
| /* 6.2.5.7 3d */ |
| byte result = 0; |
| nextByte = x + 8; |
| final int minorWidth = width - x > 8 ? 8 : width - x; |
| |
| if (lineNumber > 0) |
| { |
| line1 = (line1 << 8) |
| | (nextByte < width ? regionBitmap.getByteAsInteger(idx + 1) : 0); |
| } |
| |
| if (lineNumber > 1) |
| { |
| line2 = (line2 << 8) | (nextByte < width |
| ? regionBitmap.getByteAsInteger(idx - rowStride + 1) << 6 : 0); |
| } |
| |
| for (int minorX = 0; minorX < minorWidth; minorX++) |
| { |
| final int toShift = 7 - minorX; |
| if (override) |
| { |
| overriddenContext = overrideAtTemplate0b(context, (x + minorX), lineNumber, |
| result, minorX, toShift); |
| cx.setIndex(overriddenContext); |
| } |
| else |
| { |
| cx.setIndex(context); |
| } |
| |
| final int bit; |
| if (useSkip && hSkip.getPixel(x + minorX, lineNumber) == 1) |
| { |
| bit = 0; |
| } |
| else |
| { |
| bit = arithDecoder.decode(cx); |
| } |
| |
| result |= bit << toShift; |
| |
| context = ((context & 0x7bf7) << 1) | bit | ((line1 >> toShift) & 0x10) |
| | ((line2 >> toShift) & 0x800); |
| } |
| |
| regionBitmap.setByte(byteIndex++, result); |
| idx++; |
| } |
| } |
| |
| private void decodeTemplate1(final int lineNumber, int width, final int rowStride, |
| final int paddedWidth, int byteIndex, int idx) throws IOException |
| { |
| int context; |
| int overriddenContext; |
| |
| int line1 = 0; |
| int line2 = 0; |
| |
| if (lineNumber >= 1) |
| { |
| line1 = regionBitmap.getByteAsInteger(idx); |
| } |
| |
| if (lineNumber >= 2) |
| { |
| line2 = regionBitmap.getByteAsInteger(idx - rowStride) << 5; |
| } |
| |
| context = ((line1 >> 1) & 0x1f8) | ((line2 >> 1) & 0x1e00); |
| |
| int nextByte; |
| for (int x = 0; x < paddedWidth; x = nextByte) |
| { |
| /* 6.2.5.7 3d */ |
| byte result = 0; |
| nextByte = x + 8; |
| final int minorWidth = width - x > 8 ? 8 : width - x; |
| |
| if (lineNumber >= 1) |
| { |
| line1 = (line1 << 8) |
| | (nextByte < width ? regionBitmap.getByteAsInteger(idx + 1) : 0); |
| } |
| |
| if (lineNumber >= 2) |
| { |
| line2 = (line2 << 8) | (nextByte < width |
| ? regionBitmap.getByteAsInteger(idx - rowStride + 1) << 5 : 0); |
| } |
| |
| for (int minorX = 0; minorX < minorWidth; minorX++) |
| { |
| if (override) |
| { |
| overriddenContext = overrideAtTemplate1(context, x + minorX, lineNumber, result, |
| minorX); |
| cx.setIndex(overriddenContext); |
| } |
| else |
| { |
| cx.setIndex(context); |
| } |
| |
| final int bit; |
| if (useSkip && hSkip.getPixel(x + minorX, lineNumber) == 1) |
| { |
| bit = 0; |
| } |
| else |
| { |
| bit = arithDecoder.decode(cx); |
| } |
| |
| result |= bit << 7 - minorX; |
| |
| final int toShift = 8 - minorX; |
| context = ((context & 0xefb) << 1) | bit | ((line1 >> toShift) & 0x8) |
| | ((line2 >> toShift) & 0x200); |
| } |
| |
| regionBitmap.setByte(byteIndex++, result); |
| idx++; |
| } |
| } |
| |
| private void decodeTemplate2(final int lineNumber, final int width, final int rowStride, |
| final int paddedWidth, int byteIndex, int idx) throws IOException |
| { |
| int context; |
| int overriddenContext; |
| |
| int line1 = 0; |
| int line2 = 0; |
| |
| if (lineNumber >= 1) |
| { |
| line1 = regionBitmap.getByteAsInteger(idx); |
| } |
| |
| if (lineNumber >= 2) |
| { |
| line2 = regionBitmap.getByteAsInteger(idx - rowStride) << 4; |
| } |
| |
| context = ((line1 >> 3) & 0x7c) | ((line2 >> 3) & 0x380); |
| |
| int nextByte; |
| for (int x = 0; x < paddedWidth; x = nextByte) |
| { |
| /* 6.2.5.7 3d */ |
| byte result = 0; |
| nextByte = x + 8; |
| final int minorWidth = width - x > 8 ? 8 : width - x; |
| |
| if (lineNumber >= 1) |
| { |
| line1 = (line1 << 8) |
| | (nextByte < width ? regionBitmap.getByteAsInteger(idx + 1) : 0); |
| } |
| |
| if (lineNumber >= 2) |
| { |
| line2 = (line2 << 8) | (nextByte < width |
| ? regionBitmap.getByteAsInteger(idx - rowStride + 1) << 4 : 0); |
| } |
| |
| for (int minorX = 0; minorX < minorWidth; minorX++) |
| { |
| |
| if (override) |
| { |
| overriddenContext = overrideAtTemplate2(context, x + minorX, lineNumber, result, |
| minorX); |
| cx.setIndex(overriddenContext); |
| } |
| else |
| { |
| cx.setIndex(context); |
| } |
| |
| final int bit; |
| if (useSkip && hSkip.getPixel(x + minorX, lineNumber) == 1) |
| { |
| bit = 0; |
| } |
| else |
| { |
| bit = arithDecoder.decode(cx); |
| } |
| |
| result |= bit << (7 - minorX); |
| |
| final int toShift = 10 - minorX; |
| context = ((context & 0x1bd) << 1) | bit | ((line1 >> toShift) & 0x4) |
| | ((line2 >> toShift) & 0x80); |
| } |
| |
| regionBitmap.setByte(byteIndex++, result); |
| idx++; |
| } |
| } |
| |
| private void decodeTemplate3(final int lineNumber, final int width, final int rowStride, |
| final int paddedWidth, int byteIndex, int idx) throws IOException |
| { |
| int context; |
| int overriddenContext; |
| |
| int line1 = 0; |
| |
| if (lineNumber >= 1) |
| { |
| line1 = regionBitmap.getByteAsInteger(idx); |
| } |
| |
| context = (line1 >> 1) & 0x70; |
| |
| int nextByte; |
| for (int x = 0; x < paddedWidth; x = nextByte) |
| { |
| /* 6.2.5.7 3d */ |
| byte result = 0; |
| nextByte = x + 8; |
| final int minorWidth = width - x > 8 ? 8 : width - x; |
| |
| if (lineNumber >= 1) |
| { |
| line1 = (line1 << 8) |
| | (nextByte < width ? regionBitmap.getByteAsInteger(idx + 1) : 0); |
| } |
| |
| for (int minorX = 0; minorX < minorWidth; minorX++) |
| { |
| |
| if (override) |
| { |
| overriddenContext = overrideAtTemplate3(context, x + minorX, lineNumber, result, |
| minorX); |
| cx.setIndex(overriddenContext); |
| } |
| else |
| { |
| cx.setIndex(context); |
| } |
| |
| final int bit; |
| if (useSkip && hSkip.getPixel(x + minorX, lineNumber) == 1) |
| { |
| bit = 0; |
| } |
| else |
| { |
| bit = arithDecoder.decode(cx); |
| } |
| |
| result |= bit << (7 - minorX); |
| context = ((context & 0x1f7) << 1) | bit | ((line1 >> (8 - minorX)) & 0x010); |
| } |
| |
| regionBitmap.setByte(byteIndex++, result); |
| idx++; |
| } |
| } |
| |
| private void updateOverrideFlags() |
| { |
| if (gbAtX == null || gbAtY == null) |
| { |
| return; |
| } |
| |
| if (gbAtX.length != gbAtY.length) |
| { |
| return; |
| } |
| |
| gbAtOverride = new boolean[gbAtX.length]; |
| |
| switch (gbTemplate) |
| { |
| case 0: |
| if (!useExtTemplates) |
| { |
| if (gbAtX[0] != 3 || gbAtY[0] != -1) |
| setOverrideFlag(0); |
| |
| if (gbAtX[1] != -3 || gbAtY[1] != -1) |
| setOverrideFlag(1); |
| |
| if (gbAtX[2] != 2 || gbAtY[2] != -2) |
| setOverrideFlag(2); |
| |
| if (gbAtX[3] != -2 || gbAtY[3] != -2) |
| setOverrideFlag(3); |
| |
| } |
| else |
| { |
| if (gbAtX[0] != -2 || gbAtY[0] != 0) |
| setOverrideFlag(0); |
| |
| if (gbAtX[1] != 0 || gbAtY[1] != -2) |
| setOverrideFlag(1); |
| |
| if (gbAtX[2] != -2 || gbAtY[2] != -1) |
| setOverrideFlag(2); |
| |
| if (gbAtX[3] != -1 || gbAtY[3] != -2) |
| setOverrideFlag(3); |
| |
| if (gbAtX[4] != 1 || gbAtY[4] != -2) |
| setOverrideFlag(4); |
| |
| if (gbAtX[5] != 2 || gbAtY[5] != -1) |
| setOverrideFlag(5); |
| |
| if (gbAtX[6] != -3 || gbAtY[6] != 0) |
| setOverrideFlag(6); |
| |
| if (gbAtX[7] != -4 || gbAtY[7] != 0) |
| setOverrideFlag(7); |
| |
| if (gbAtX[8] != 2 || gbAtY[8] != -2) |
| setOverrideFlag(8); |
| |
| if (gbAtX[9] != 3 || gbAtY[9] != -1) |
| setOverrideFlag(9); |
| |
| if (gbAtX[10] != -2 || gbAtY[10] != -2) |
| setOverrideFlag(10); |
| |
| if (gbAtX[11] != -3 || gbAtY[11] != -1) |
| setOverrideFlag(11); |
| } |
| break; |
| case 1: |
| if (gbAtX[0] != 3 || gbAtY[0] != -1) |
| setOverrideFlag(0); |
| break; |
| case 2: |
| if (gbAtX[0] != 2 || gbAtY[0] != -1) |
| setOverrideFlag(0); |
| break; |
| case 3: |
| if (gbAtX[0] != 2 || gbAtY[0] != -1) |
| setOverrideFlag(0); |
| break; |
| } |
| |
| } |
| |
| private void setOverrideFlag(final int index) |
| { |
| gbAtOverride[index] = true; |
| override = true; |
| } |
| |
| private int overrideAtTemplate0a(int context, final int x, final int y, final int result, |
| final int minorX, final int toShift) throws IOException |
| { |
| if (gbAtOverride[0]) |
| { |
| context &= 0xffef; |
| if (gbAtY[0] == 0 && gbAtX[0] >= -minorX) |
| context |= (result >> (toShift - gbAtX[0]) & 0x1) << 4; |
| else |
| context |= getPixel(x + gbAtX[0], y + gbAtY[0]) << 4; |
| } |
| |
| if (gbAtOverride[1]) |
| { |
| context &= 0xfbff; |
| if (gbAtY[1] == 0 && gbAtX[1] >= -minorX) |
| context |= (result >> (toShift - gbAtX[1]) & 0x1) << 10; |
| else |
| context |= getPixel(x + gbAtX[1], y + gbAtY[1]) << 10; |
| } |
| |
| if (gbAtOverride[2]) |
| { |
| context &= 0xf7ff; |
| if (gbAtY[2] == 0 && gbAtX[2] >= -minorX) |
| context |= (result >> (toShift - gbAtX[2]) & 0x1) << 11; |
| else |
| context |= getPixel(x + gbAtX[2], y + gbAtY[2]) << 11; |
| } |
| |
| if (gbAtOverride[3]) |
| { |
| context &= 0x7fff; |
| if (gbAtY[3] == 0 && gbAtX[3] >= -minorX) |
| context |= (result >> (toShift - gbAtX[3]) & 0x1) << 15; |
| else |
| context |= getPixel(x + gbAtX[3], y + gbAtY[3]) << 15; |
| } |
| return context; |
| } |
| |
| private int overrideAtTemplate0b(int context, final int x, final int y, final int result, |
| final int minorX, final int toShift) throws IOException |
| { |
| if (gbAtOverride[0]) |
| { |
| context &= 0xfffd; |
| if (gbAtY[0] == 0 && gbAtX[0] >= -minorX) |
| context |= (result >> (toShift - gbAtX[0]) & 0x1) << 1; |
| else |
| context |= getPixel(x + gbAtX[0], y + gbAtY[0]) << 1; |
| } |
| |
| if (gbAtOverride[1]) |
| { |
| context &= 0xdfff; |
| if (gbAtY[1] == 0 && gbAtX[1] >= -minorX) |
| context |= (result >> (toShift - gbAtX[1]) & 0x1) << 13; |
| else |
| context |= getPixel(x + gbAtX[1], y + gbAtY[1]) << 13; |
| } |
| if (gbAtOverride[2]) |
| { |
| context &= 0xfdff; |
| if (gbAtY[2] == 0 && gbAtX[2] >= -minorX) |
| context |= (result >> (toShift - gbAtX[2]) & 0x1) << 9; |
| else |
| context |= getPixel(x + gbAtX[2], y + gbAtY[2]) << 9; |
| } |
| if (gbAtOverride[3]) |
| { |
| context &= 0xbfff; |
| if (gbAtY[3] == 0 && gbAtX[3] >= -minorX) |
| context |= (result >> (toShift - gbAtX[3]) & 0x1) << 14; |
| else |
| context |= getPixel(x + gbAtX[3], y + gbAtY[3]) << 14; |
| } |
| if (gbAtOverride[4]) |
| { |
| context &= 0xefff; |
| if (gbAtY[4] == 0 && gbAtX[4] >= -minorX) |
| context |= (result >> (toShift - gbAtX[4]) & 0x1) << 12; |
| else |
| context |= getPixel(x + gbAtX[4], y + gbAtY[4]) << 12; |
| } |
| if (gbAtOverride[5]) |
| { |
| context &= 0xffdf; |
| if (gbAtY[5] == 0 && gbAtX[5] >= -minorX) |
| context |= (result >> (toShift - gbAtX[5]) & 0x1) << 5; |
| else |
| context |= getPixel(x + gbAtX[5], y + gbAtY[5]) << 5; |
| } |
| if (gbAtOverride[6]) |
| { |
| context &= 0xfffb; |
| if (gbAtY[6] == 0 && gbAtX[6] >= -minorX) |
| context |= (result >> (toShift - gbAtX[6]) & 0x1) << 2; |
| else |
| context |= getPixel(x + gbAtX[6], y + gbAtY[6]) << 2; |
| } |
| if (gbAtOverride[7]) |
| { |
| context &= 0xfff7; |
| if (gbAtY[7] == 0 && gbAtX[7] >= -minorX) |
| context |= (result >> (toShift - gbAtX[7]) & 0x1) << 3; |
| else |
| context |= getPixel(x + gbAtX[7], y + gbAtY[7]) << 3; |
| } |
| if (gbAtOverride[8]) |
| { |
| context &= 0xf7ff; |
| if (gbAtY[8] == 0 && gbAtX[8] >= -minorX) |
| context |= (result >> (toShift - gbAtX[8]) & 0x1) << 11; |
| else |
| context |= getPixel(x + gbAtX[8], y + gbAtY[8]) << 11; |
| } |
| if (gbAtOverride[9]) |
| { |
| context &= 0xffef; |
| if (gbAtY[9] == 0 && gbAtX[9] >= -minorX) |
| context |= (result >> (toShift - gbAtX[9]) & 0x1) << 4; |
| else |
| context |= getPixel(x + gbAtX[9], y + gbAtY[9]) << 4; |
| } |
| if (gbAtOverride[10]) |
| { |
| context &= 0x7fff; |
| if (gbAtY[10] == 0 && gbAtX[10] >= -minorX) |
| context |= (result >> (toShift - gbAtX[10]) & 0x1) << 15; |
| else |
| context |= getPixel(x + gbAtX[10], y + gbAtY[10]) << 15; |
| } |
| if (gbAtOverride[11]) |
| { |
| context &= 0xfdff; |
| if (gbAtY[11] == 0 && gbAtX[11] >= -minorX) |
| context |= (result >> (toShift - gbAtX[11]) & 0x1) << 10; |
| else |
| context |= getPixel(x + gbAtX[11], y + gbAtY[11]) << 10; |
| } |
| |
| return context; |
| } |
| |
| private int overrideAtTemplate1(int context, final int x, final int y, final int result, |
| final int minorX) throws IOException |
| { |
| context &= 0x1ff7; |
| if (gbAtY[0] == 0 && gbAtX[0] >= -minorX) |
| return (context | (result >> (7 - (minorX + gbAtX[0])) & 0x1) << 3); |
| else |
| return (context | getPixel(x + gbAtX[0], y + gbAtY[0]) << 3); |
| } |
| |
| private int overrideAtTemplate2(int context, final int x, final int y, final int result, |
| final int minorX) throws IOException |
| { |
| context &= 0x3fb; |
| if (gbAtY[0] == 0 && gbAtX[0] >= -minorX) |
| return (context | (result >> (7 - (minorX + gbAtX[0])) & 0x1) << 2); |
| else |
| return (context | getPixel(x + gbAtX[0], y + gbAtY[0]) << 2); |
| } |
| |
| private int overrideAtTemplate3(int context, final int x, final int y, final int result, |
| final int minorX) throws IOException |
| { |
| context &= 0x3ef; |
| if (gbAtY[0] == 0 && gbAtX[0] >= -minorX) |
| return (context | (result >> (7 - (minorX + gbAtX[0])) & 0x1) << 4); |
| else |
| return (context | getPixel(x + gbAtX[0], y + gbAtY[0]) << 4); |
| } |
| |
| private byte getPixel(final int x, final int y) throws IOException |
| { |
| if (x < 0 || x >= regionBitmap.getWidth()) |
| return 0; |
| |
| if (y < 0 || y >= regionBitmap.getHeight()) |
| return 0; |
| |
| return regionBitmap.getPixel(x, y); |
| } |
| |
| /** |
| * Used by {@link SymbolDictionary}. |
| * |
| * @param isMMREncoded the data is MMR encoded |
| * @param dataOffset the offset |
| * @param dataLength the length of the data |
| * @param gbh bitmap height |
| * @param gbw bitmap width |
| */ |
| protected void setParameters(final boolean isMMREncoded, final long dataOffset, |
| final long dataLength, final int gbh, final int gbw) |
| { |
| this.isMMREncoded = isMMREncoded; |
| this.dataOffset = dataOffset; |
| this.dataLength = dataLength; |
| this.regionInfo.setBitmapHeight(gbh); |
| this.regionInfo.setBitmapWidth(gbw); |
| |
| this.mmrDecompressor = null; |
| resetBitmap(); |
| } |
| |
| /** |
| * @param isMMREncoded the data is MMR encoded |
| * @param sdTemplate sd template |
| * @param isTPGDon is TPGDon |
| * @param useSkip use skip |
| * @param sdATX x values gbA pixels |
| * @param sdATY y values gbA pixels |
| * @param symWidth bitmap width |
| * @param hcHeight bitmap height |
| * @param cx context for the arithmetic decoder |
| * @param arithmeticDecoder the arithmetic decode to be used |
| * |
| * Used by {@link SymbolDictionary}. |
| */ |
| protected void setParameters(final boolean isMMREncoded, final byte sdTemplate, |
| final boolean isTPGDon, final boolean useSkip, final short[] sdATX, final short[] sdATY, |
| final int symWidth, final int hcHeight, final CX cx, |
| final ArithmeticDecoder arithmeticDecoder) |
| { |
| this.isMMREncoded = isMMREncoded; |
| this.gbTemplate = sdTemplate; |
| this.isTPGDon = isTPGDon; |
| this.gbAtX = sdATX; |
| this.gbAtY = sdATY; |
| this.regionInfo.setBitmapWidth(symWidth); |
| this.regionInfo.setBitmapHeight(hcHeight); |
| if (null != cx) |
| this.cx = cx; |
| if (null != arithmeticDecoder) |
| this.arithDecoder = arithmeticDecoder; |
| |
| this.mmrDecompressor = null; |
| this.useSkip = useSkip; |
| resetBitmap(); |
| } |
| |
| /** |
| * Used by {@link PatternDictionary} and {@link HalftoneRegion}. |
| * |
| * @param isMMREncoded the data is MMR encoded |
| * @param dataOffset the offset |
| * @param dataLength the length of the data |
| * @param gbh bitmap height |
| * @param gbw bitmap width |
| * @param gbTemplate gb template |
| * @param isTPGDon is TPGDon |
| * @param useSkip use skip |
| * @param hSkip the HSKIP bitmap |
| * @param gbAtX x values of gbA pixels |
| * @param gbAtY y values of gbA pixels |
| * |
| */ |
| protected void setParameters(final boolean isMMREncoded, final long dataOffset, |
| final long dataLength, final int gbh, final int gbw, final byte gbTemplate, |
| final boolean isTPGDon, final boolean useSkip, final Bitmap hSkip, final short[] gbAtX, final short[] gbAtY) |
| { |
| this.dataOffset = dataOffset; |
| this.dataLength = dataLength; |
| |
| this.regionInfo = new RegionSegmentInformation(); |
| this.regionInfo.setBitmapHeight(gbh); |
| this.regionInfo.setBitmapWidth(gbw); |
| this.gbTemplate = gbTemplate; |
| |
| this.isMMREncoded = isMMREncoded; |
| this.isTPGDon = isTPGDon; |
| this.gbAtX = gbAtX; |
| this.gbAtY = gbAtY; |
| this.useSkip = useSkip; |
| this.hSkip = hSkip; |
| } |
| |
| /** |
| * Simply sets the memory-critical bitmap of this region to {@code null}. |
| */ |
| protected void resetBitmap() |
| { |
| this.regionBitmap = null; |
| } |
| |
| @Override |
| public void init(final SegmentHeader header, final SubInputStream sis) |
| throws InvalidHeaderValueException, IOException |
| { |
| this.subInputStream = sis; |
| this.regionInfo = new RegionSegmentInformation(subInputStream); |
| parseHeader(); |
| } |
| |
| @Override |
| public RegionSegmentInformation getRegionInfo() |
| { |
| return regionInfo; |
| } |
| |
| protected boolean useExtTemplates() |
| { |
| return useExtTemplates; |
| } |
| |
| protected boolean isTPGDon() |
| { |
| return isTPGDon; |
| } |
| |
| protected byte getGbTemplate() |
| { |
| return gbTemplate; |
| } |
| |
| protected boolean isMMREncoded() |
| { |
| return isMMREncoded; |
| } |
| |
| protected short[] getGbAtX() |
| { |
| return gbAtX; |
| } |
| |
| protected short[] getGbAtY() |
| { |
| return gbAtY; |
| } |
| } |
