--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2014 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * This source file is based in part on the work of the Independent JPEG Group (IJG)
+ * and is made available under the terms contained in the about_files/IJG_README
+ * file accompanying this program.
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.internal.image;
+
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
+import java.io.*;
+
+public final class JPEGFileFormat extends FileFormat {
+ int restartInterval;
+ JPEGFrameHeader frameHeader;
+ int imageWidth, imageHeight;
+ int interleavedMcuCols, interleavedMcuRows;
+ int maxV, maxH;
+ boolean progressive;
+ int samplePrecision;
+ int nComponents;
+ int[][] frameComponents;
+ int[] componentIds;
+ byte[][] imageComponents;
+ int[] dataUnit;
+ int[][][] dataUnits;
+ int[] precedingDCs;
+ JPEGScanHeader scanHeader;
+ byte[] dataBuffer;
+ int currentBitCount;
+ int bufferCurrentPosition;
+ int restartsToGo;
+ int nextRestartNumber;
+ JPEGHuffmanTable[] acHuffmanTables;
+ JPEGHuffmanTable[] dcHuffmanTables;
+ int[][] quantizationTables;
+ int currentByte;
+ int encoderQFactor = 75;
+ int eobrun = 0;
+ /* JPEGConstants */
+ public static final int DCTSIZE = 8;
+ public static final int DCTSIZESQR = 64;
+ /* JPEGFixedPointConstants */
+ public static final int FIX_0_899976223 = 7373;
+ public static final int FIX_1_961570560 = 16069;
+ public static final int FIX_2_053119869 = 16819;
+ public static final int FIX_0_298631336 = 2446;
+ public static final int FIX_1_847759065 = 15137;
+ public static final int FIX_1_175875602 = 9633;
+ public static final int FIX_3_072711026 = 25172;
+ public static final int FIX_0_765366865 = 6270;
+ public static final int FIX_2_562915447 = 20995;
+ public static final int FIX_0_541196100 = 4433;
+ public static final int FIX_0_390180644 = 3196;
+ public static final int FIX_1_501321110 = 12299;
+ /* JPEGMarkerCodes */
+ public static final int APP0 = 0xFFE0;
+ public static final int APP15 = 0xFFEF;
+ public static final int COM = 0xFFFE;
+ public static final int DAC = 0xFFCC;
+ public static final int DHP = 0xFFDE;
+ public static final int DHT = 0xFFC4;
+ public static final int DNL = 0xFFDC;
+ public static final int DRI = 0xFFDD;
+ public static final int DQT = 0xFFDB;
+ public static final int EOI = 0xFFD9;
+ public static final int EXP = 0xFFDF;
+ public static final int JPG = 0xFFC8;
+ public static final int JPG0 = 0xFFF0;
+ public static final int JPG13 = 0xFFFD;
+ public static final int RST0 = 0xFFD0;
+ public static final int RST1 = 0xFFD1;
+ public static final int RST2 = 0xFFD2;
+ public static final int RST3 = 0xFFD3;
+ public static final int RST4 = 0xFFD4;
+ public static final int RST5 = 0xFFD5;
+ public static final int RST6 = 0xFFD6;
+ public static final int RST7 = 0xFFD7;
+ public static final int SOF0 = 0xFFC0;
+ public static final int SOF1 = 0xFFC1;
+ public static final int SOF2 = 0xFFC2;
+ public static final int SOF3 = 0xFFC3;
+ public static final int SOF5 = 0xFFC5;
+ public static final int SOF6 = 0xFFC6;
+ public static final int SOF7 = 0xFFC7;
+ public static final int SOF9 = 0xFFC9;
+ public static final int SOF10 = 0xFFCA;
+ public static final int SOF11 = 0xFFCB;
+ public static final int SOF13 = 0xFFCD;
+ public static final int SOF14 = 0xFFCE;
+ public static final int SOF15 = 0xFFCF;
+ public static final int SOI = 0xFFD8;
+ public static final int SOS = 0xFFDA;
+ public static final int TEM = 0xFF01;
+ /* JPEGFrameComponentParameterConstants */
+ public static final int TQI = 0;
+ public static final int HI = 1;
+ public static final int VI = 2;
+ public static final int CW = 3;
+ public static final int CH = 4;
+ /* JPEGScanComponentParameterConstants */
+ public static final int DC = 0;
+ public static final int AC = 1;
+ /* JFIF Component Constants */
+ public static final int ID_Y = 1 - 1;
+ public static final int ID_CB = 2 - 1;
+ public static final int ID_CR = 3 - 1;
+ public static final RGB[] RGB16 = new RGB[] {
+ new RGB(0,0,0),
+ new RGB(0x80,0,0),
+ new RGB(0,0x80,0),
+ new RGB(0x80,0x80,0),
+ new RGB(0,0,0x80),
+ new RGB(0x80,0,0x80),
+ new RGB(0,0x80,0x80),
+ new RGB(0xC0,0xC0,0xC0),
+ new RGB(0x80,0x80,0x80),
+ new RGB(0xFF,0,0),
+ new RGB(0,0xFF,0),
+ new RGB(0xFF,0xFF,0),
+ new RGB(0,0,0xFF),
+ new RGB(0xFF,0,0xFF),
+ new RGB(0,0xFF,0xFF),
+ new RGB(0xFF,0xFF,0xFF),
+ };
+ public static final int[] ExtendTest = {
+ 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048,
+ 4096, 8192, 16384, 32768, 65536, 131072, 262144
+ };
+ public static final int[] ExtendOffset = new int[] {
+ 0, -1, -3, -7, -15, -31, -63, -127, -255, -511, -1023, -2047,
+ -4095, -8191, -16383, -32767, -65535, -131071, -262143
+ };
+ public static final int[] ZigZag8x8 = {
+ 0, 1, 8, 16, 9, 2, 3, 10,
+ 17, 24, 32, 25, 18, 11, 4, 5,
+ 12, 19, 26, 33, 40, 48, 41, 34,
+ 27, 20, 13, 6, 7, 14, 21, 28,
+ 35, 42, 49, 56, 57, 50, 43, 36,
+ 29, 22, 15, 23, 30, 37, 44, 51,
+ 58, 59, 52, 45, 38, 31, 39, 46,
+ 53, 60, 61, 54, 47, 55, 62, 63
+ };
+
+ public static final int[] CrRTable, CbBTable, CrGTable, CbGTable;
+ public static final int[] RYTable, GYTable, BYTable,
+ RCbTable, GCbTable, BCbTable, RCrTable, GCrTable, BCrTable, NBitsTable;
+ static {
+ /* Initialize RGB-YCbCr Tables */
+ int [] rYTable = new int[256];
+ int [] gYTable = new int[256];
+ int [] bYTable = new int[256];
+ int [] rCbTable = new int[256];
+ int [] gCbTable = new int[256];
+ int [] bCbTable = new int[256];
+ int [] gCrTable = new int[256];
+ int [] bCrTable = new int[256];
+ for (int i = 0; i < 256; i++) {
+ rYTable[i] = i * 19595;
+ gYTable[i] = i * 38470;
+ bYTable[i] = i * 7471 + 32768;
+ rCbTable[i] = i * -11059;
+ gCbTable[i] = i * -21709;
+ bCbTable[i] = i * 32768 + 8388608;
+ gCrTable[i] = i * -27439;
+ bCrTable[i] = i * -5329;
+ }
+ RYTable = rYTable;
+ GYTable = gYTable;
+ BYTable = bYTable;
+ RCbTable = rCbTable;
+ GCbTable = gCbTable;
+ BCbTable = bCbTable;
+ RCrTable = bCbTable;
+ GCrTable = gCrTable;
+ BCrTable = bCrTable;
+
+ /* Initialize YCbCr-RGB Tables */
+ int [] crRTable = new int[256];
+ int [] cbBTable = new int[256];
+ int [] crGTable = new int[256];
+ int [] cbGTable = new int[256];
+ for (int i = 0; i < 256; i++) {
+ int x2 = 2 * i - 255;
+ crRTable[i] = (45941 * x2 + 32768) >> 16;
+ cbBTable[i] = (58065 * x2 + 32768) >> 16;
+ crGTable[i] = -23401 * x2;
+ cbGTable[i] = -11277 * x2 + 32768;
+ }
+ CrRTable = crRTable;
+ CbBTable = cbBTable;
+ CrGTable = crGTable;
+ CbGTable = cbGTable;
+
+ /* Initialize BitCount Table */
+ int nBits = 1;
+ int power2 = 2;
+ int [] nBitsTable = new int[2048];
+ nBitsTable[0] = 0;
+ for (int i = 1; i < nBitsTable.length; i++) {
+ if (!(i < power2)) {
+ nBits++;
+ power2 *= 2;
+ }
+ nBitsTable[i] = nBits;
+ }
+ NBitsTable = nBitsTable;
+ }
+void compress(ImageData image, byte[] dataYComp, byte[] dataCbComp, byte[] dataCrComp) {
+ int srcWidth = image.width;
+ int srcHeight = image.height;
+ int vhFactor = maxV * maxH;
+ int[] frameComponent;
+ imageComponents = new byte[nComponents][];
+ for (int i = 0; i < nComponents; i++) {
+ frameComponent = frameComponents[componentIds[i]];
+ imageComponents[i] = new byte[frameComponent[CW] * frameComponent[CH]];
+ }
+ frameComponent = frameComponents[componentIds[ID_Y]];
+ for (int yPos = 0; yPos < srcHeight; yPos++) {
+ int srcOfs = yPos * srcWidth;
+ int dstOfs = yPos * frameComponent[CW];
+ System.arraycopy(dataYComp, srcOfs, imageComponents[ID_Y], dstOfs, srcWidth);
+ }
+ frameComponent = frameComponents[componentIds[ID_CB]];
+ for (int yPos = 0; yPos < srcHeight / maxV; yPos++) {
+ int destRowIndex = yPos * frameComponent[CW];
+ for (int xPos = 0; xPos < srcWidth / maxH; xPos++) {
+ int sum = 0;
+ for (int iv = 0; iv < maxV; iv++) {
+ int srcIndex = (yPos * maxV + iv) * srcWidth + (xPos * maxH);
+ for (int ih = 0; ih < maxH; ih++) {
+ sum += dataCbComp[srcIndex + ih] & 0xFF;
+ }
+ }
+ imageComponents[ID_CB][destRowIndex + xPos] = (byte)(sum / vhFactor);
+ }
+ }
+ frameComponent = frameComponents[componentIds[ID_CR]];
+ for (int yPos = 0; yPos < srcHeight / maxV; yPos++) {
+ int destRowIndex = yPos * frameComponent[CW];
+ for (int xPos = 0; xPos < srcWidth / maxH; xPos++) {
+ int sum = 0;
+ for (int iv = 0; iv < maxV; iv++) {
+ int srcIndex = (yPos * maxV + iv) * srcWidth + (xPos * maxH);
+ for (int ih = 0; ih < maxH; ih++) {
+ sum += dataCrComp[srcIndex + ih] & 0xFF;
+ }
+ }
+ imageComponents[ID_CR][destRowIndex + xPos] = (byte)(sum / vhFactor);
+ }
+ }
+ for (int iComp = 0; iComp < nComponents; iComp++) {
+ byte[] imageComponent = imageComponents[iComp];
+ frameComponent = frameComponents[componentIds[iComp]];
+ int hFactor = frameComponent[HI];
+ int vFactor = frameComponent[VI];
+ int componentWidth = frameComponent[CW];
+ int componentHeight = frameComponent[CH];
+ int compressedWidth = srcWidth / (maxH / hFactor);
+ int compressedHeight = srcHeight / (maxV / vFactor);
+ if (compressedWidth < componentWidth) {
+ int delta = componentWidth - compressedWidth;
+ for (int yPos = 0; yPos < compressedHeight; yPos++) {
+ int dstOfs = ((yPos + 1) * componentWidth - delta);
+ int dataValue = imageComponent[(dstOfs > 0) ? dstOfs - 1 : 0] & 0xFF;
+ for (int i = 0; i < delta; i++) {
+ imageComponent[dstOfs + i] = (byte)dataValue;
+ }
+ }
+ }
+ if (compressedHeight < componentHeight) {
+ int srcOfs = (compressedHeight > 0) ? (compressedHeight - 1) * componentWidth : 1;
+ for (int yPos = (compressedHeight > 0) ? compressedHeight : 1; yPos <= componentHeight; yPos++) {
+ int dstOfs = (yPos - 1) * componentWidth;
+ System.arraycopy(imageComponent, srcOfs, imageComponent, dstOfs, componentWidth);
+ }
+ }
+ }
+}
+void convert4BitRGBToYCbCr(ImageData image) {
+ RGB[] rgbs = image.getRGBs();
+ int paletteSize = rgbs.length;
+ byte[] yComp = new byte[paletteSize];
+ byte[] cbComp = new byte[paletteSize];
+ byte[] crComp = new byte[paletteSize];
+ int srcWidth = image.width;
+ int srcHeight = image.height;
+ for (int i = 0; i < paletteSize; i++) {
+ RGB color = rgbs[i];
+ int r = color.red;
+ int g = color.green;
+ int b = color.blue;
+ int n = RYTable[r] + GYTable[g] + BYTable[b];
+ yComp[i] = (byte)(n >> 16);
+ if ((n < 0) && ((n & 0xFFFF) != 0)) yComp[i]--;
+ n = RCbTable[r] + GCbTable[g] + BCbTable[b];
+ cbComp[i] = (byte)(n >> 16);
+ if ((n < 0) && ((n & 0xFFFF) != 0)) cbComp[i]--;
+ n = RCrTable[r] + GCrTable[g] + BCrTable[b];
+ crComp[i] = (byte)(n >> 16);
+ if ((n < 0) && ((n & 0xFFFF) != 0)) crComp[i]--;
+ }
+ int bSize = srcWidth * srcHeight;
+ byte[] dataYComp = new byte[bSize];
+ byte[] dataCbComp = new byte[bSize];
+ byte[] dataCrComp = new byte[bSize];
+ byte[] origData = image.data;
+ int bytesPerLine = image.bytesPerLine;
+ int maxScanlineByte = srcWidth >> 1;
+ for (int yPos = 0; yPos < srcHeight; yPos++) {
+ for (int xPos = 0; xPos < maxScanlineByte; xPos++) {
+ int srcIndex = yPos * bytesPerLine + xPos;
+ int dstIndex = yPos * srcWidth + (xPos * 2);
+ int value2 = origData[srcIndex] & 0xFF;
+ int value1 = value2 >> 4;
+ value2 &= 0x0F;
+ dataYComp[dstIndex] = yComp[value1];
+ dataCbComp[dstIndex] = cbComp[value1];
+ dataCrComp[dstIndex] = crComp[value1];
+ dataYComp[dstIndex + 1] = yComp[value2];
+ dataCbComp[dstIndex + 1] = cbComp[value2];
+ dataCrComp[dstIndex + 1] = crComp[value2];
+ }
+ }
+ compress(image, dataYComp, dataCbComp, dataCrComp);
+}
+void convert8BitRGBToYCbCr(ImageData image) {
+ RGB[] rgbs = image.getRGBs();
+ int paletteSize = rgbs.length;
+ byte[] yComp = new byte[paletteSize];
+ byte[] cbComp = new byte[paletteSize];
+ byte[] crComp = new byte[paletteSize];
+ int srcWidth = image.width;
+ int srcHeight = image.height;
+ for (int i = 0; i < paletteSize; i++) {
+ RGB color = rgbs[i];
+ int r = color.red;
+ int g = color.green;
+ int b = color.blue;
+ int n = RYTable[r] + GYTable[g] + BYTable[b];
+ yComp[i] = (byte)(n >> 16);
+ if ((n < 0) && ((n & 0xFFFF) != 0)) yComp[i]--;
+ n = RCbTable[r] + GCbTable[g] + BCbTable[b];
+ cbComp[i] = (byte)(n >> 16);
+ if ((n < 0) && ((n & 0xFFFF) != 0)) cbComp[i]--;
+ n = RCrTable[r] + GCrTable[g] + BCrTable[b];
+ crComp[i] = (byte)(n >> 16);
+ if ((n < 0) && ((n & 0xFFFF) != 0)) crComp[i]--;
+ }
+ int dstWidth = image.width;
+ int dstHeight = srcHeight;
+ int stride = ((srcWidth + 3) >> 2) << 2;
+ int bSize = dstWidth * dstHeight;
+ byte[] dataYComp = new byte[bSize];
+ byte[] dataCbComp = new byte[bSize];
+ byte[] dataCrComp = new byte[bSize];
+ byte[] origData = image.data;
+ for (int yPos = 0; yPos < srcHeight; yPos++) {
+ int srcRowIndex = yPos * stride;
+ int dstRowIndex = yPos * dstWidth;
+ for (int xPos = 0; xPos < srcWidth; xPos++) {
+ int value = origData[srcRowIndex + xPos] & 0xFF;
+ int dstIndex = dstRowIndex + xPos;
+ dataYComp[dstIndex] = yComp[value];
+ dataCbComp[dstIndex] = cbComp[value];
+ dataCrComp[dstIndex] = crComp[value];
+ }
+ }
+ compress(image, dataYComp, dataCbComp, dataCrComp);
+}
+byte[] convertCMYKToRGB() {
+ /* Unsupported CMYK format. Answer an empty byte array. */
+ return new byte[0];
+}
+void convertImageToYCbCr(ImageData image) {
+ switch (image.depth) {
+ case 4:
+ convert4BitRGBToYCbCr(image);
+ return;
+ case 8:
+ convert8BitRGBToYCbCr(image);
+ return;
+ case 16:
+ case 24:
+ case 32:
+ convertMultiRGBToYCbCr(image);
+ return;
+ default:
+ SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
+ }
+ return;
+}
+void convertMultiRGBToYCbCr(ImageData image) {
+ int srcWidth = image.width;
+ int srcHeight = image.height;
+ int bSize = srcWidth * srcHeight;
+ byte[] dataYComp = new byte[bSize];
+ byte[] dataCbComp = new byte[bSize];
+ byte[] dataCrComp = new byte[bSize];
+ PaletteData palette = image.palette;
+ int[] buffer = new int[srcWidth];
+ if (palette.isDirect) {
+ int redMask = palette.redMask;
+ int greenMask = palette.greenMask;
+ int blueMask = palette.blueMask;
+ int redShift = palette.redShift;
+ int greenShift = palette.greenShift;
+ int blueShift = palette.blueShift;
+ for (int yPos = 0; yPos < srcHeight; yPos++) {
+ image.getPixels(0, yPos, srcWidth, buffer, 0);
+ int dstRowIndex = yPos * srcWidth;
+ for (int xPos = 0; xPos < srcWidth; xPos++) {
+ int pixel = buffer[xPos];
+ int dstDataIndex = dstRowIndex + xPos;
+ int r = pixel & redMask;
+ r = (redShift < 0) ? r >>> -redShift : r << redShift;
+ int g = pixel & greenMask;
+ g = (greenShift < 0) ? g >>> -greenShift : g << greenShift;
+ int b = pixel & blueMask;
+ b = (blueShift < 0) ? b >>> -blueShift : b << blueShift;
+ dataYComp[dstDataIndex] = (byte)((RYTable[r] + GYTable[g] + BYTable[b]) >> 16);
+ dataCbComp[dstDataIndex] = (byte)((RCbTable[r] + GCbTable[g] + BCbTable[b]) >> 16);
+ dataCrComp[dstDataIndex] = (byte)((RCrTable[r] + GCrTable[g] + BCrTable[b]) >> 16);
+ }
+ }
+ } else {
+ for (int yPos = 0; yPos < srcHeight; yPos++) {
+ image.getPixels(0, yPos, srcWidth, buffer, 0);
+ int dstRowIndex = yPos * srcWidth;
+ for (int xPos = 0; xPos < srcWidth; xPos++) {
+ int pixel = buffer[xPos];
+ int dstDataIndex = dstRowIndex + xPos;
+ RGB rgb = palette.getRGB(pixel);
+ int r = rgb.red;
+ int g = rgb.green;
+ int b = rgb.blue;
+ dataYComp[dstDataIndex] = (byte)((RYTable[r] + GYTable[g] + BYTable[b]) >> 16);
+ dataCbComp[dstDataIndex] = (byte)((RCbTable[r] + GCbTable[g] + BCbTable[b]) >> 16);
+ dataCrComp[dstDataIndex] = (byte)((RCrTable[r] + GCrTable[g] + BCrTable[b]) >> 16);
+ }
+ }
+ }
+ compress(image, dataYComp, dataCbComp, dataCrComp);
+}
+byte[] convertYToRGB() {
+ int compWidth = frameComponents[componentIds[ID_Y]][CW];
+ int bytesPerLine = (((imageWidth * 8 + 7) / 8) + 3) / 4 * 4;
+ byte[] data = new byte[bytesPerLine * imageHeight];
+ byte[] yComp = imageComponents[ID_Y];
+ int destIndex = 0;
+ for (int i = 0; i < imageHeight; i++) {
+ int srcIndex = i * compWidth;
+ for (int j = 0; j < bytesPerLine; j++) {
+ int y = yComp[srcIndex] & 0xFF;
+ if (y < 0) {
+ y = 0;
+ } else {
+ if (y > 255) y = 255;
+ }
+ if (j >= imageWidth) {
+ y = 0;
+ }
+ data[destIndex] = (byte)y;
+ srcIndex++;
+ destIndex++;
+ }
+ }
+ return data;
+}
+byte[] convertYCbCrToRGB() {
+ /**
+ * Convert existing image components into an RGB format.
+ * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
+ * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
+ * The conversion equations to be implemented are therefore
+ * R = Y + 1.40200 * Cr
+ * G = Y - 0.34414 * Cb - 0.71414 * Cr
+ * B = Y + 1.77200 * Cb
+ * where Cb and Cr represent the incoming values less MAXJSAMPLE/2.
+ * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
+ *
+ * To avoid floating-point arithmetic, we represent the fractional constants
+ * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
+ * the products by 2^16, with appropriate rounding, to get the correct answer.
+ * Notice that Y, being an integral input, does not contribute any fraction
+ * so it need not participate in the rounding.
+ *
+ * For even more speed, we avoid doing any multiplications in the inner loop
+ * by precalculating the constants times Cb and Cr for all possible values.
+ * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
+ * for 12-bit samples it is still acceptable. It's not very reasonable for
+ * 16-bit samples, but if you want lossless storage you shouldn't be changing
+ * colorspace anyway.
+ * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
+ * values for the G calculation are left scaled up, since we must add them
+ * together before rounding.
+ */
+ int bSize = imageWidth * imageHeight * nComponents;
+ byte[] rgbData = new byte[bSize];
+ int destIndex = 0;
+ expandImageComponents();
+ byte[] yComp = imageComponents[ID_Y];
+ byte[] cbComp = imageComponents[ID_CB];
+ byte[] crComp = imageComponents[ID_CR];
+ int compWidth = frameComponents[componentIds[ID_Y]][CW];
+ for (int v = 0; v < imageHeight; v++) {
+ int srcIndex = v * compWidth;
+ for (int i = 0; i < imageWidth; i++) {
+ int y = yComp[srcIndex] & 0xFF;
+ int cb = cbComp[srcIndex] & 0xFF;
+ int cr = crComp[srcIndex] & 0xFF;
+ int r = y + CrRTable[cr];
+ int g = y + ((CbGTable[cb] + CrGTable[cr]) >> 16);
+ int b = y + CbBTable[cb];
+ if (r < 0) {
+ r = 0;
+ } else {
+ if (r > 255) r = 255;
+ }
+ if (g < 0) {
+ g = 0;
+ } else {
+ if (g > 255) g = 255;
+ }
+ if (b < 0) {
+ b = 0;
+ } else {
+ if (b > 255) b = 255;
+ }
+ rgbData[destIndex] = (byte)b;
+ rgbData[destIndex + 1] = (byte)g;
+ rgbData[destIndex + 2] = (byte)r;
+ destIndex += 3;
+ srcIndex++;
+ }
+ }
+ return rgbData;
+}
+void decodeACCoefficients(int[] dataUnit, int iComp) {
+ int[] sParams = scanHeader.componentParameters[componentIds[iComp]];
+ JPEGHuffmanTable acTable = acHuffmanTables[sParams[AC]];
+ int k = 1;
+ while (k < 64) {
+ int rs = decodeUsingTable(acTable);
+ int r = rs >> 4;
+ int s = rs & 0xF;
+ if (s == 0) {
+ if (r == 15) {
+ k += 16;
+ } else {
+ break;
+ }
+ } else {
+ k += r;
+ int bits = receive(s);
+ dataUnit[ZigZag8x8[k]] = extendBy(bits, s);
+ k++;
+ }
+ }
+}
+void decodeACFirstCoefficients(int[] dataUnit, int iComp, int start, int end, int approxBit) {
+ if (eobrun > 0) {
+ eobrun--;
+ return;
+ }
+ int[] sParams = scanHeader.componentParameters[componentIds[iComp]];
+ JPEGHuffmanTable acTable = acHuffmanTables[sParams[AC]];
+ int k = start;
+ while (k <= end) {
+ int rs = decodeUsingTable(acTable);
+ int r = rs >> 4;
+ int s = rs & 0xF;
+ if (s == 0) {
+ if (r == 15) {
+ k += 16;
+ } else {
+ eobrun = (1 << r) + receive(r) - 1;
+ break;
+ }
+ } else {
+ k += r;
+ int bits = receive(s);
+ dataUnit[ZigZag8x8[k]] = extendBy(bits, s) << approxBit;
+ k++;
+ }
+ }
+}
+void decodeACRefineCoefficients(int[] dataUnit, int iComp, int start, int end, int approxBit) {
+ int[] sParams = scanHeader.componentParameters[componentIds[iComp]];
+ JPEGHuffmanTable acTable = acHuffmanTables[sParams[AC]];
+ int k = start;
+ while (k <= end) {
+ if (eobrun > 0) {
+ while (k <= end) {
+ int zzIndex = ZigZag8x8[k];
+ if (dataUnit[zzIndex] != 0) {
+ dataUnit[zzIndex] = refineAC(dataUnit[zzIndex], approxBit);
+ }
+ k++;
+ }
+ eobrun--;
+ } else {
+ int rs = decodeUsingTable(acTable);
+ int r = rs >> 4;
+ int s = rs & 0xF;
+ if (s == 0) {
+ if (r == 15) {
+ int zeros = 0;
+ while (zeros < 16 && k <= end) {
+ int zzIndex = ZigZag8x8[k];
+ if (dataUnit[zzIndex] != 0) {
+ dataUnit[zzIndex] = refineAC(dataUnit[zzIndex], approxBit);
+ } else {
+ zeros++;
+ }
+ k++;
+ }
+ } else {
+ eobrun = (1 << r) + receive(r);
+ }
+ } else {
+ int bit = receive(s);
+ int zeros = 0;
+ int zzIndex = ZigZag8x8[k];
+ while ((zeros < r || dataUnit[zzIndex] != 0) && k <= end) {
+ if (dataUnit[zzIndex] != 0) {
+ dataUnit[zzIndex] = refineAC(dataUnit[zzIndex], approxBit);
+ } else {
+ zeros++;
+ }
+ k++;
+ zzIndex = ZigZag8x8[k];
+ }
+ if (bit != 0) {
+ dataUnit[zzIndex] = 1 << approxBit;
+ } else {
+ dataUnit[zzIndex] = -1 << approxBit;
+ }
+ k++;
+ }
+ }
+ }
+}
+int refineAC(int ac, int approxBit) {
+ if (ac > 0) {
+ int bit = nextBit();
+ if (bit != 0) {
+ ac += 1 << approxBit;
+ }
+ } else if (ac < 0) {
+ int bit = nextBit();
+ if (bit != 0) {
+ ac += -1 << approxBit;
+ }
+ }
+ return ac;
+}
+void decodeDCCoefficient(int[] dataUnit, int iComp, boolean first, int approxBit) {
+ int[] sParams = scanHeader.componentParameters[componentIds[iComp]];
+ JPEGHuffmanTable dcTable = dcHuffmanTables[sParams[DC]];
+ int lastDC = 0;
+ if (progressive && !first) {
+ int bit = nextBit();
+ lastDC = dataUnit[0] + (bit << approxBit);
+ } else {
+ lastDC = precedingDCs[iComp];
+ int nBits = decodeUsingTable(dcTable);
+ if (nBits != 0) {
+ int bits = receive(nBits);
+ int diff = extendBy(bits, nBits);
+ lastDC += diff;
+ precedingDCs[iComp] = lastDC;
+ }
+ if (progressive) {
+ lastDC = lastDC << approxBit;
+ }
+ }
+ dataUnit[0] = lastDC;
+}
+void dequantize(int[] dataUnit, int iComp) {
+ int[] qTable = quantizationTables[frameComponents[componentIds[iComp]][TQI]];
+ for (int i = 0; i < dataUnit.length; i++) {
+ int zzIndex = ZigZag8x8[i];
+ dataUnit[zzIndex] = dataUnit[zzIndex] * qTable[i];
+ }
+}
+byte[] decodeImageComponents() {
+ if (nComponents == 3) { // compIds 1, 2, 3
+ return convertYCbCrToRGB();
+ }
+// if (nComponents == 3) { // compIds 1, 4, 5
+// Unsupported CMYK format.
+// return convertYIQToRGB();
+// }
+ if (nComponents == 4) {
+ return convertCMYKToRGB();
+ }
+ return convertYToRGB();
+}
+void decodeMCUAtXAndY(int xmcu, int ymcu, int nComponentsInScan, boolean first, int start, int end, int approxBit) {
+ for (int iComp = 0; iComp < nComponentsInScan; iComp++) {
+ int scanComponent = iComp;
+ while (scanHeader.componentParameters[componentIds[scanComponent]] == null) {
+ scanComponent++;
+ }
+ int[] frameComponent = frameComponents[componentIds[scanComponent]];
+ int hi = frameComponent[HI];
+ int vi = frameComponent[VI];
+ if (nComponentsInScan == 1) {
+ hi = 1;
+ vi = 1;
+ }
+ int compWidth = frameComponent[CW];
+ for (int ivi = 0; ivi < vi; ivi++) {
+ for (int ihi = 0; ihi < hi; ihi++) {
+ if (progressive) {
+ // Progressive: First scan - create a new data unit.
+ // Subsequent scans - refine the existing data unit.
+ int index = (ymcu * vi + ivi) * compWidth + xmcu * hi + ihi;
+ dataUnit = dataUnits[scanComponent][index];
+ if (dataUnit == null) {
+ dataUnit = new int[64];
+ dataUnits[scanComponent][index] = dataUnit;
+ }
+ } else {
+ // Sequential: Clear and reuse the data unit buffer.
+ for (int i = 0; i < dataUnit.length; i++) {
+ dataUnit[i] = 0;
+ }
+ }
+ if (!progressive || scanHeader.isDCProgressiveScan()) {
+ decodeDCCoefficient(dataUnit, scanComponent, first, approxBit);
+ }
+ if (!progressive) {
+ decodeACCoefficients(dataUnit, scanComponent);
+ } else {
+ if (scanHeader.isACProgressiveScan()) {
+ if (first) {
+ decodeACFirstCoefficients(dataUnit, scanComponent, start, end, approxBit);
+ } else {
+ decodeACRefineCoefficients(dataUnit, scanComponent, start, end, approxBit);
+ }
+ }
+ if (loader.hasListeners()) {
+ // Dequantization, IDCT, up-sampling and color conversion
+ // are done on a copy of the coefficient data in order to
+ // display the image incrementally.
+ int[] temp = dataUnit;
+ dataUnit = new int[64];
+ System.arraycopy(temp, 0, dataUnit, 0, 64);
+ }
+ }
+ if (!progressive || (progressive && loader.hasListeners())) {
+ dequantize(dataUnit, scanComponent);
+ inverseDCT(dataUnit);
+ storeData(dataUnit, scanComponent, xmcu, ymcu, hi, ihi, vi, ivi);
+ }
+ }
+ }
+ }
+}
+void decodeScan() {
+ if (progressive && !scanHeader.verifyProgressiveScan()) {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+ int nComponentsInScan = scanHeader.getNumberOfImageComponents();
+ int mcuRowsInScan = interleavedMcuRows;
+ int mcusPerRow = interleavedMcuCols;
+ if (nComponentsInScan == 1) {
+ // Non-interleaved.
+ int scanComponent = 0;
+ while (scanHeader.componentParameters[componentIds[scanComponent]] == null) {
+ scanComponent++;
+ }
+ int[] frameComponent = frameComponents[componentIds[scanComponent]];
+ int hi = frameComponent[HI];
+ int vi = frameComponent[VI];
+ int mcuWidth = DCTSIZE * maxH / hi;
+ int mcuHeight = DCTSIZE * maxV / vi;
+ mcusPerRow = (imageWidth + mcuWidth - 1) / mcuWidth;
+ mcuRowsInScan = (imageHeight + mcuHeight - 1) / mcuHeight;
+ }
+ boolean first = scanHeader.isFirstScan();
+ int start = scanHeader.getStartOfSpectralSelection();
+ int end = scanHeader.getEndOfSpectralSelection();
+ int approxBit = scanHeader.getApproxBitPositionLow();
+ restartsToGo = restartInterval;
+ nextRestartNumber = 0;
+ for (int ymcu = 0; ymcu < mcuRowsInScan; ymcu++) {
+ for (int xmcu = 0; xmcu < mcusPerRow; xmcu++) {
+ if (restartInterval != 0) {
+ if (restartsToGo == 0) processRestartInterval();
+ restartsToGo--;
+ }
+ decodeMCUAtXAndY(xmcu, ymcu, nComponentsInScan, first, start, end, approxBit);
+ }
+ }
+}
+int decodeUsingTable(JPEGHuffmanTable huffmanTable) {
+ int i = 0;
+ int[] maxCodes = huffmanTable.getDhMaxCodes();
+ int[] minCodes = huffmanTable.getDhMinCodes();
+ int[] valPtrs = huffmanTable.getDhValPtrs();
+ int[] huffVals = huffmanTable.getDhValues();
+ int code = nextBit();
+ while (code > maxCodes[i]) {
+ code = code * 2 + nextBit();
+ i++;
+ }
+ int j = valPtrs[i] + code - minCodes[i];
+ return huffVals[j];
+}
+void emit(int huffCode, int nBits) {
+ if (nBits == 0) {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+ int[] power2m1 = new int[] {
+ 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191,
+ 16383, 32767, 65535, 131125
+ };
+ int code = (huffCode & power2m1[nBits - 1]) << (24 - nBits - currentBitCount);
+ byte[] codeBuffer = new byte[4];
+ codeBuffer[0] = (byte)(code & 0xFF);
+ codeBuffer[1] = (byte)((code >> 8) & 0xFF);
+ codeBuffer[2] = (byte)((code >> 16) & 0xFF);
+ codeBuffer[3] = (byte)((code >> 24) & 0xFF);
+ int abs = nBits - (8 - currentBitCount);
+ if (abs < 0) abs = -abs;
+ if ((abs >> 3) > 0) {
+ currentByte += codeBuffer[2];
+ emitByte((byte)currentByte);
+ emitByte(codeBuffer[1]);
+ currentByte = codeBuffer[0];
+ currentBitCount += nBits - 16;
+ } else {
+ currentBitCount += nBits;
+ if (currentBitCount >= 8) {
+ currentByte += codeBuffer[2];
+ emitByte((byte)currentByte);
+ currentByte = codeBuffer[1];
+ currentBitCount -= 8;
+ } else {
+ currentByte += codeBuffer[2];
+ }
+ }
+}
+void emitByte(byte byteValue) {
+ if (bufferCurrentPosition >= 512) {
+ resetOutputBuffer();
+ }
+ dataBuffer[bufferCurrentPosition] = byteValue;
+ bufferCurrentPosition++;
+ if (byteValue == -1) {
+ emitByte((byte)0);
+ }
+}
+void encodeACCoefficients(int[] dataUnit, int iComp) {
+ int[] sParams = scanHeader.componentParameters[iComp];
+ JPEGHuffmanTable acTable = acHuffmanTables[sParams[AC]];
+ int[] ehCodes = acTable.ehCodes;
+ byte[] ehSizes = acTable.ehCodeLengths;
+ int r = 0;
+ int k = 1;
+ while (k < 64) {
+ k++;
+ int acValue = dataUnit[ZigZag8x8[k - 1]];
+ if (acValue == 0) {
+ if (k == 64) {
+ emit(ehCodes[0], ehSizes[0] & 0xFF);
+ } else {
+ r++;
+ }
+ } else {
+ while (r > 15) {
+ emit(ehCodes[0xF0], ehSizes[0xF0] & 0xFF);
+ r -= 16;
+ }
+ if (acValue < 0) {
+ int absACValue = acValue;
+ if (absACValue < 0) absACValue = -absACValue;
+ int nBits = NBitsTable[absACValue];
+ int rs = r * 16 + nBits;
+ emit(ehCodes[rs], ehSizes[rs] & 0xFF);
+ emit(0xFFFFFF - absACValue, nBits);
+ } else {
+ int nBits = NBitsTable[acValue];
+ int rs = r * 16 + nBits;
+ emit(ehCodes[rs], ehSizes[rs] & 0xFF);
+ emit(acValue, nBits);
+ }
+ r = 0;
+ }
+ }
+}
+void encodeDCCoefficients(int[] dataUnit, int iComp) {
+ int[] sParams = scanHeader.componentParameters[iComp];
+ JPEGHuffmanTable dcTable = dcHuffmanTables[sParams[DC]];
+ int lastDC = precedingDCs[iComp];
+ int dcValue = dataUnit[0];
+ int diff = dcValue - lastDC;
+ precedingDCs[iComp] = dcValue;
+ if (diff < 0) {
+ int absDiff = 0 - diff;
+ int nBits = NBitsTable[absDiff];
+ emit(dcTable.ehCodes[nBits], dcTable.ehCodeLengths[nBits]);
+ emit(0xFFFFFF - absDiff, nBits);
+ } else {
+ int nBits = NBitsTable[diff];
+ emit(dcTable.ehCodes[nBits], dcTable.ehCodeLengths[nBits]);
+ if (nBits != 0) {
+ emit(diff, nBits);
+ }
+ }
+}
+void encodeMCUAtXAndY(int xmcu, int ymcu) {
+ int nComponentsInScan = scanHeader.getNumberOfImageComponents();
+ dataUnit = new int[64];
+ for (int iComp = 0; iComp < nComponentsInScan; iComp++) {
+ int[] frameComponent = frameComponents[componentIds[iComp]];
+ int hi = frameComponent[HI];
+ int vi = frameComponent[VI];
+ for (int ivi = 0; ivi < vi; ivi++) {
+ for (int ihi = 0; ihi < hi; ihi++) {
+ extractData(dataUnit, iComp, xmcu, ymcu, ihi, ivi);
+ forwardDCT(dataUnit);
+ quantizeData(dataUnit, iComp);
+ encodeDCCoefficients(dataUnit, iComp);
+ encodeACCoefficients(dataUnit, iComp);
+ }
+ }
+ }
+}
+void encodeScan() {
+ for (int ymcu = 0; ymcu < interleavedMcuRows; ymcu++) {
+ for (int xmcu = 0; xmcu < interleavedMcuCols; xmcu++) {
+ encodeMCUAtXAndY(xmcu, ymcu);
+ }
+ }
+ if (currentBitCount != 0) {
+ emitByte((byte)currentByte);
+ }
+ resetOutputBuffer();
+}
+void expandImageComponents() {
+ for (int iComp = 0; iComp < nComponents; iComp++) {
+ int[] frameComponent = frameComponents[componentIds[iComp]];
+ int hi = frameComponent[HI];
+ int vi = frameComponent[VI];
+ int upH = maxH / hi;
+ int upV = maxV / vi;
+ if ((upH * upV) > 1) {
+ byte[] component = imageComponents[iComp];
+ int compWidth = frameComponent[CW];
+ int compHeight = frameComponent[CH];
+ int upCompWidth = compWidth * upH;
+ int upCompHeight = compHeight * upV;
+ ImageData src = new ImageData(compWidth, compHeight, 8, new PaletteData(RGB16), 4, component);
+ ImageData dest = src.scaledTo(upCompWidth, upCompHeight);
+ imageComponents[iComp] = dest.data;
+ }
+ }
+}
+int extendBy(int diff, int t) {
+ if (diff < ExtendTest[t]) {
+ return diff + ExtendOffset[t];
+ } else {
+ return diff;
+ }
+}
+void extractData(int[] dataUnit, int iComp, int xmcu, int ymcu, int ihi, int ivi) {
+ byte[] compImage = imageComponents[iComp];
+ int[] frameComponent = frameComponents[componentIds[iComp]];
+ int hi = frameComponent[HI];
+ int vi = frameComponent[VI];
+ int compWidth = frameComponent[CW];
+ int srcIndex = ((ymcu * vi + ivi) * compWidth * DCTSIZE) + ((xmcu * hi + ihi) * DCTSIZE);
+ int destIndex = 0;
+ for (int i = 0; i < DCTSIZE; i++) {
+ for (int col = 0; col < DCTSIZE; col++) {
+ dataUnit[destIndex] = (compImage[srcIndex + col] & 0xFF) - 128;
+ destIndex++;
+ }
+ srcIndex += compWidth;
+ }
+}
+void forwardDCT(int[] dataUnit) {
+ for (int row = 0; row < 8; row++) {
+ int rIndex = row * DCTSIZE;
+ int tmp0 = dataUnit[rIndex] + dataUnit[rIndex + 7];
+ int tmp7 = dataUnit[rIndex] - dataUnit[rIndex + 7];
+ int tmp1 = dataUnit[rIndex + 1] + dataUnit[rIndex + 6];
+ int tmp6 = dataUnit[rIndex + 1] - dataUnit[rIndex + 6];
+ int tmp2 = dataUnit[rIndex + 2] + dataUnit[rIndex + 5];
+ int tmp5 = dataUnit[rIndex + 2] - dataUnit[rIndex + 5];
+ int tmp3 = dataUnit[rIndex + 3] + dataUnit[rIndex + 4];
+ int tmp4 = dataUnit[rIndex + 3] - dataUnit[rIndex + 4];
+
+ /**
+ * Even part per LL&M figure 1 --- note that published figure
+ * is faulty; rotator 'sqrt(2)*c1' should be 'sqrt(2)*c6'.
+ */
+ int tmp10 = tmp0 + tmp3;
+ int tmp13 = tmp0 - tmp3;
+ int tmp11 = tmp1 + tmp2;
+ int tmp12 = tmp1 - tmp2;
+
+ dataUnit[rIndex] = (tmp10 + tmp11) * 4;
+ dataUnit[rIndex + 4] = (tmp10 - tmp11) * 4;
+
+ int z1 = (tmp12 + tmp13) * FIX_0_541196100;
+ int n = z1 + (tmp13 * FIX_0_765366865) + 1024;
+ dataUnit[rIndex + 2] = n >> 11;
+ if ((n < 0) && ((n & 0x07FF) != 0)) dataUnit[rIndex + 2]--;
+ n = z1 + (tmp12 * (0 - FIX_1_847759065)) + 1024;
+ dataUnit[rIndex + 6] = n >> 11;
+ if ((n < 0) && ((n & 0x07FF) != 0)) dataUnit[rIndex + 6]--;
+
+ /**
+ * Odd part per figure 8 --- note paper omits factor of sqrt(2).
+ * cK represents cos(K*pi/16).
+ * i0..i3 in the paper are tmp4..tmp7 here.
+ */
+ z1 = tmp4 + tmp7;
+ int z2 = tmp5 + tmp6;
+ int z3 = tmp4 + tmp6;
+ int z4 = tmp5 + tmp7;
+ int z5 = (z3 + z4) * FIX_1_175875602; // sqrt(2) * c3
+
+ tmp4 *= FIX_0_298631336; // sqrt(2) * (-c1+c3+c5-c7)
+ tmp5 *= FIX_2_053119869; // sqrt(2) * ( c1+c3-c5+c7)
+ tmp6 *= FIX_3_072711026; // sqrt(2) * ( c1+c3+c5-c7)
+ tmp7 *= FIX_1_501321110; // sqrt(2) * ( c1+c3-c5-c7)
+ z1 *= 0 - FIX_0_899976223; // sqrt(2) * (c7-c3)
+ z2 *= 0 - FIX_2_562915447; // sqrt(2) * (-c1-c3)
+ z3 *= 0 - FIX_1_961570560; // sqrt(2) * (-c3-c5)
+ z4 *= 0 - FIX_0_390180644; // sqrt(2) * (c5-c3)
+
+ z3 += z5;
+ z4 += z5;
+
+ n = tmp4 + z1 + z3 + 1024;
+ dataUnit[rIndex + 7] = n >> 11;
+ if ((n < 0) && ((n & 0x07FF) != 0)) dataUnit[rIndex + 7]--;
+ n = tmp5 + z2 + z4 + 1024;
+ dataUnit[rIndex + 5] = n >> 11;
+ if ((n < 0) && ((n & 0x07FF) != 0)) dataUnit[rIndex + 5]--;
+ n = tmp6 + z2 + z3 + 1024;
+ dataUnit[rIndex + 3] = n >> 11;
+ if ((n < 0) && ((n & 0x07FF) != 0)) dataUnit[rIndex + 3]--;
+ n = tmp7 + z1 + z4 + 1024;
+ dataUnit[rIndex + 1] = n >> 11;
+ if ((n < 0) && ((n & 0x07FF) != 0)) dataUnit[rIndex + 1]--;
+ }
+
+ /**
+ * Pass 2: process columns.
+ * Note that we must descale the results by a factor of 8 == 2**3,
+ * and also undo the PASS1_BITS scaling.
+ */
+ for (int col = 0; col < 8; col++) {
+ int c0 = col;
+ int c1 = col + 8;
+ int c2 = col + 16;
+ int c3 = col + 24;
+ int c4 = col + 32;
+ int c5 = col + 40;
+ int c6 = col + 48;
+ int c7 = col + 56;
+ int tmp0 = dataUnit[c0] + dataUnit[c7];
+ int tmp7 = dataUnit[c0] - dataUnit[c7];
+ int tmp1 = dataUnit[c1] + dataUnit[c6];
+ int tmp6 = dataUnit[c1] - dataUnit[c6];
+ int tmp2 = dataUnit[c2] + dataUnit[c5];
+ int tmp5 = dataUnit[c2] - dataUnit[c5];
+ int tmp3 = dataUnit[c3] + dataUnit[c4];
+ int tmp4 = dataUnit[c3] - dataUnit[c4];
+
+ /**
+ * Even part per LL&M figure 1 --- note that published figure
+ * is faulty; rotator 'sqrt(2)*c1' should be 'sqrt(2)*c6'.
+ */
+ int tmp10 = tmp0 + tmp3;
+ int tmp13 = tmp0 - tmp3;
+ int tmp11 = tmp1 + tmp2;
+ int tmp12 = tmp1 - tmp2;
+
+ int n = tmp10 + tmp11 + 16;
+ dataUnit[c0] = n >> 5;
+ if ((n < 0) && ((n & 0x1F) != 0)) dataUnit[c0]--;
+ n = tmp10 - tmp11 + 16;
+ dataUnit[c4] = n >> 5;
+ if ((n < 0) && ((n & 0x1F) != 0)) dataUnit[c4]--;
+
+ int z1 = (tmp12 + tmp13) * FIX_0_541196100;
+ n = z1 + (tmp13 * FIX_0_765366865) + 131072;
+ dataUnit[c2] = n >> 18;
+ if ((n < 0) && ((n & 0x3FFFF) != 0)) dataUnit[c2]--;
+ n = z1 + (tmp12 * (0 - FIX_1_847759065)) + 131072;
+ dataUnit[c6] = n >> 18;
+ if ((n < 0) && ((n & 0x3FFFF) != 0)) dataUnit[c6]--;
+
+ /**
+ * Odd part per figure 8 --- note paper omits factor of sqrt(2).
+ * cK represents cos(K*pi/16).
+ * i0..i3 in the paper are tmp4..tmp7 here.
+ */
+ z1 = tmp4 + tmp7;
+ int z2 = tmp5 + tmp6;
+ int z3 = tmp4 + tmp6;
+ int z4 = tmp5 + tmp7;
+ int z5 = (z3 + z4) * FIX_1_175875602; // sqrt(2) * c3
+
+ tmp4 *= FIX_0_298631336; // sqrt(2) * (-c1+c3+c5-c7)
+ tmp5 *= FIX_2_053119869; // sqrt(2) * ( c1+c3-c5+c7)
+ tmp6 *= FIX_3_072711026; // sqrt(2) * ( c1+c3+c5-c7)
+ tmp7 *= FIX_1_501321110; // sqrt(2) * ( c1+c3-c5-c7)
+ z1 *= 0 - FIX_0_899976223; // sqrt(2) * (c7-c3)
+ z2 *= 0 - FIX_2_562915447; // sqrt(2) * (-c1-c3)
+ z3 *= 0 - FIX_1_961570560; // sqrt(2) * (-c3-c5)
+ z4 *= 0 - FIX_0_390180644; // sqrt(2) * (c5-c3)
+
+ z3 += z5;
+ z4 += z5;
+
+ n = tmp4 + z1 + z3 + 131072;
+ dataUnit[c7] = n >> 18;
+ if ((n < 0) && ((n & 0x3FFFF) != 0)) dataUnit[c7]--;
+ n = tmp5 + z2 + z4 + 131072;
+ dataUnit[c5] = n >> 18;
+ if ((n < 0) && ((n & 0x3FFFF) != 0)) dataUnit[c5]--;
+ n = tmp6 + z2 + z3 + 131072;
+ dataUnit[c3] = n >> 18;
+ if ((n < 0) && ((n & 0x3FFFF) != 0)) dataUnit[c3]--;
+ n = tmp7 + z1 + z4 + 131072;
+ dataUnit[c1] = n >> 18;
+ if ((n < 0) && ((n & 0x3FFFF) != 0)) dataUnit[c1]--;
+ }
+}
+void getAPP0() {
+ JPEGAppn appn = new JPEGAppn(inputStream);
+ if (!appn.verify()) {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+}
+void getCOM() {
+ new JPEGComment(inputStream);
+}
+void getDAC() {
+ new JPEGArithmeticConditioningTable(inputStream);
+}
+void getDHT() {
+ JPEGHuffmanTable dht = new JPEGHuffmanTable(inputStream);
+ if (!dht.verify()) {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+ if (acHuffmanTables == null) {
+ acHuffmanTables = new JPEGHuffmanTable[4];
+ }
+ if (dcHuffmanTables == null) {
+ dcHuffmanTables = new JPEGHuffmanTable[4];
+ }
+ JPEGHuffmanTable[] dhtTables = dht.getAllTables();
+ for (int i = 0; i < dhtTables.length; i++) {
+ JPEGHuffmanTable dhtTable = dhtTables[i];
+ if (dhtTable.getTableClass() == 0) {
+ dcHuffmanTables[dhtTable.getTableIdentifier()] = dhtTable;
+ } else {
+ acHuffmanTables[dhtTable.getTableIdentifier()] = dhtTable;
+ }
+ }
+}
+void getDNL() {
+ new JPEGRestartInterval(inputStream);
+}
+void getDQT() {
+ JPEGQuantizationTable dqt = new JPEGQuantizationTable(inputStream);
+ int[][] currentTables = quantizationTables;
+ if (currentTables == null) {
+ currentTables = new int[4][];
+ }
+ int[] dqtTablesKeys = dqt.getQuantizationTablesKeys();
+ int[][] dqtTablesValues = dqt.getQuantizationTablesValues();
+ for (int i = 0; i < dqtTablesKeys.length; i++) {
+ int index = dqtTablesKeys[i];
+ currentTables[index] = dqtTablesValues[i];
+ }
+ quantizationTables = currentTables;
+}
+void getDRI() {
+ JPEGRestartInterval dri = new JPEGRestartInterval(inputStream);
+ if (!dri.verify()) {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+ restartInterval = dri.getRestartInterval();
+}
+void inverseDCT(int[] dataUnit) {
+ for (int row = 0; row < 8; row++) {
+ int rIndex = row * DCTSIZE;
+ /**
+ * Due to quantization, we will usually find that many of the input
+ * coefficients are zero, especially the AC terms. We can exploit this
+ * by short-circuiting the IDCT calculation for any row in which all
+ * the AC terms are zero. In that case each output is equal to the
+ * DC coefficient (with scale factor as needed).
+ * With typical images and quantization tables, half or more of the
+ * row DCT calculations can be simplified this way.
+ */
+ if (isZeroInRow(dataUnit, rIndex)) {
+ int dcVal = dataUnit[rIndex] << 2;
+ for (int i = rIndex + 7; i >= rIndex; i--) {
+ dataUnit[i] = dcVal;
+ }
+ } else {
+ /**
+ * Even part: reverse the even part of the forward DCT.
+ * The rotator is sqrt(2)*c(-6).
+ */
+ int z2 = dataUnit[rIndex + 2];
+ int z3 = dataUnit[rIndex + 6];
+ int z1 = (z2 + z3) * FIX_0_541196100;
+ int tmp2 = z1 + (z3 * (0 - FIX_1_847759065));
+ int tmp3 = z1 + (z2 * FIX_0_765366865);
+ int tmp0 = (dataUnit[rIndex] + dataUnit[rIndex + 4]) << 13;
+ int tmp1 = (dataUnit[rIndex] - dataUnit[rIndex + 4]) << 13;
+ int tmp10 = tmp0 + tmp3;
+ int tmp13 = tmp0 - tmp3;
+ int tmp11 = tmp1 + tmp2;
+ int tmp12 = tmp1 - tmp2;
+ /**
+ * Odd part per figure 8; the matrix is unitary and hence its
+ * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
+ */
+ tmp0 = dataUnit[rIndex + 7];
+ tmp1 = dataUnit[rIndex + 5];
+ tmp2 = dataUnit[rIndex + 3];
+ tmp3 = dataUnit[rIndex + 1];
+ z1 = tmp0 + tmp3;
+ z2 = tmp1 + tmp2;
+ z3 = tmp0 + tmp2;
+ int z4 = tmp1 + tmp3;
+ int z5 = (z3 + z4) * FIX_1_175875602; /* sqrt(2) * c3 */
+
+ tmp0 *= FIX_0_298631336; /* sqrt(2) * (-c1+c3+c5-c7) */
+ tmp1 *= FIX_2_053119869; /* sqrt(2) * ( c1+c3-c5+c7) */
+ tmp2 *= FIX_3_072711026; /* sqrt(2) * ( c1+c3+c5-c7) */
+ tmp3 *= FIX_1_501321110; /* sqrt(2) * ( c1+c3-c5-c7) */
+ z1 *= 0 - FIX_0_899976223; /* sqrt(2) * (c7-c3) */
+ z2 *= 0 - FIX_2_562915447; /* sqrt(2) * (-c1-c3) */
+ z3 *= 0 - FIX_1_961570560; /* sqrt(2) * (-c3-c5) */
+ z4 *= 0 - FIX_0_390180644; /* sqrt(2) * (c5-c3) */
+
+ z3 += z5;
+ z4 += z5;
+ tmp0 += z1 + z3;
+ tmp1 += z2 + z4;
+ tmp2 += z2 + z3;
+ tmp3 += z1 + z4;
+
+ dataUnit[rIndex] = (tmp10 + tmp3 + 1024) >> 11;
+ dataUnit[rIndex + 7] = (tmp10 - tmp3 + 1024) >> 11;
+ dataUnit[rIndex + 1] = (tmp11 + tmp2 + 1024) >> 11;
+ dataUnit[rIndex + 6] = (tmp11 - tmp2 + 1024) >> 11;
+ dataUnit[rIndex + 2] = (tmp12 + tmp1 + 1024) >> 11;
+ dataUnit[rIndex + 5] = (tmp12 - tmp1 + 1024) >> 11;
+ dataUnit[rIndex + 3] = (tmp13 + tmp0 + 1024) >> 11;
+ dataUnit[rIndex + 4] = (tmp13 - tmp0 + 1024) >> 11;
+ }
+ }
+ /**
+ * Pass 2: process columns.
+ * Note that we must descale the results by a factor of 8 == 2**3,
+ * and also undo the PASS1_BITS scaling.
+ */
+ for (int col = 0; col < 8; col++) {
+ int c0 = col;
+ int c1 = col + 8;
+ int c2 = col + 16;
+ int c3 = col + 24;
+ int c4 = col + 32;
+ int c5 = col + 40;
+ int c6 = col + 48;
+ int c7 = col + 56;
+ if (isZeroInColumn(dataUnit, col)) {
+ int dcVal = (dataUnit[c0] + 16) >> 5;
+ dataUnit[c0] = dcVal;
+ dataUnit[c1] = dcVal;
+ dataUnit[c2] = dcVal;
+ dataUnit[c3] = dcVal;
+ dataUnit[c4] = dcVal;
+ dataUnit[c5] = dcVal;
+ dataUnit[c6] = dcVal;
+ dataUnit[c7] = dcVal;
+ } else {
+ /**
+ * Even part: reverse the even part of the forward DCT.
+ * The rotator is sqrt(2)*c(-6).
+ */
+ int z0 = dataUnit[c0];
+ int z2 = dataUnit[c2];
+ int z3 = dataUnit[c6];
+ int z4 = dataUnit[c4];
+ int z1 = (z2 + z3) * FIX_0_541196100;
+ int tmp2 = z1 + (z3 * (0 - FIX_1_847759065));
+ int tmp3 = z1 + (z2 * FIX_0_765366865);
+ int tmp0 = (z0 + z4) << 13;
+ int tmp1 = (z0 - z4) << 13;
+ int tmp10 = tmp0 + tmp3;
+ int tmp13 = tmp0 - tmp3;
+ int tmp11 = tmp1 + tmp2;
+ int tmp12 = tmp1 - tmp2;
+ /**
+ * Odd part per figure 8; the matrix is unitary and hence its
+ * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
+ */
+ tmp0 = dataUnit[c7];
+ tmp1 = dataUnit[c5];
+ tmp2 = dataUnit[c3];
+ tmp3 = dataUnit[c1];
+ z1 = tmp0 + tmp3;
+ z2 = tmp1 + tmp2;
+ z3 = tmp0 + tmp2;
+ z4 = tmp1 + tmp3;
+ z0 = (z3 + z4) * FIX_1_175875602; /* sqrt(2) * c3 */
+
+ tmp0 *= FIX_0_298631336; /* sqrt(2) * (-c1+c3+c5-c7) */
+ tmp1 *= FIX_2_053119869; /* sqrt(2) * ( c1+c3-c5+c7) */
+ tmp2 *= FIX_3_072711026; /* sqrt(2) * ( c1+c3+c5-c7) */
+ tmp3 *= FIX_1_501321110; /* sqrt(2) * ( c1+c3-c5-c7) */
+ z1 *= 0 - FIX_0_899976223; /* sqrt(2) * (c7-c3) */
+ z2 *= 0 - FIX_2_562915447; /* sqrt(2) * (-c1-c3) */
+ z3 *= 0 - FIX_1_961570560; /* sqrt(2) * (-c3-c5) */
+ z4 *= 0 - FIX_0_390180644; /* sqrt(2) * (c5-c3) */
+
+ z3 += z0;
+ z4 += z0;
+
+ tmp0 += z1 + z3;
+ tmp1 += z2 + z4;
+ tmp2 += z2 + z3;
+ tmp3 += z1 + z4;
+
+ /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
+ dataUnit[c0] = (tmp10 + tmp3 + 131072) >> 18;
+ dataUnit[c7] = (tmp10 - tmp3 + 131072) >> 18;
+ dataUnit[c1] = (tmp11 + tmp2 + 131072) >> 18;
+ dataUnit[c6] = (tmp11 - tmp2 + 131072) >> 18;
+ dataUnit[c2] = (tmp12 + tmp1 + 131072) >> 18;
+ dataUnit[c5] = (tmp12 - tmp1 + 131072) >> 18;
+ dataUnit[c3] = (tmp13 + tmp0 + 131072) >> 18;
+ dataUnit[c4] = (tmp13 - tmp0 + 131072) >> 18;
+ }
+ }
+}
+@Override
+boolean isFileFormat(LEDataInputStream stream) {
+ try {
+ JPEGStartOfImage soi = new JPEGStartOfImage(stream);
+ stream.unread(soi.reference);
+ return soi.verify(); // we no longer check for appN
+ } catch (Exception e) {
+ return false;
+ }
+}
+boolean isZeroInColumn(int[] dataUnit, int col) {
+ return dataUnit[col + 8] == 0 && dataUnit[col + 16] == 0
+ && dataUnit[col + 24] == 0 && dataUnit[col + 32] == 0
+ && dataUnit[col + 40] == 0 && dataUnit[col + 48] == 0
+ && dataUnit[col + 56] == 0;
+}
+boolean isZeroInRow(int[] dataUnit, int rIndex) {
+ return dataUnit[rIndex + 1] == 0 && dataUnit[rIndex + 2] == 0
+ && dataUnit[rIndex + 3] == 0 && dataUnit[rIndex + 4] == 0
+ && dataUnit[rIndex + 5] == 0 && dataUnit[rIndex + 6] == 0
+ && dataUnit[rIndex + 7] == 0;
+}
+@Override
+ImageData[] loadFromByteStream() {
+ //TEMPORARY CODE
+ if (System.getProperty("org.eclipse.swt.internal.image.JPEGFileFormat_3.2") == null) {
+ return JPEGDecoder.loadFromByteStream(inputStream, loader);
+ }
+ JPEGStartOfImage soi = new JPEGStartOfImage(inputStream);
+ if (!soi.verify()) SWT.error(SWT.ERROR_INVALID_IMAGE);
+ restartInterval = 0;
+
+ /* Process the tables preceding the frame header. */
+ processTables();
+
+ /* Start of Frame. */
+ frameHeader = new JPEGFrameHeader(inputStream);
+ if (!frameHeader.verify()) SWT.error(SWT.ERROR_INVALID_IMAGE);
+ imageWidth = frameHeader.getSamplesPerLine();
+ imageHeight = frameHeader.getNumberOfLines();
+ maxH = frameHeader.getMaxHFactor();
+ maxV = frameHeader.getMaxVFactor();
+ int mcuWidth = maxH * DCTSIZE;
+ int mcuHeight = maxV * DCTSIZE;
+ interleavedMcuCols = (imageWidth + mcuWidth - 1) / mcuWidth;
+ interleavedMcuRows = (imageHeight + mcuHeight - 1) / mcuHeight;
+ progressive = frameHeader.isProgressive();
+ samplePrecision = frameHeader.getSamplePrecision();
+ nComponents = frameHeader.getNumberOfImageComponents();
+ frameComponents = frameHeader.componentParameters;
+ componentIds = frameHeader.componentIdentifiers;
+ imageComponents = new byte[nComponents][];
+ if (progressive) {
+ // Progressive jpeg: need to keep all of the data units.
+ dataUnits = new int[nComponents][][];
+ } else {
+ // Sequential jpeg: only need one data unit.
+ dataUnit = new int[8 * 8];
+ }
+ for (int i = 0; i < nComponents; i++) {
+ int[] frameComponent = frameComponents[componentIds[i]];
+ int bufferSize = frameComponent[CW] * frameComponent[CH];
+ imageComponents[i] = new byte[bufferSize];
+ if (progressive) {
+ dataUnits[i] = new int[bufferSize][];
+ }
+ }
+
+ /* Process the tables preceding the scan header. */
+ processTables();
+
+ /* Start of Scan. */
+ scanHeader = new JPEGScanHeader(inputStream);
+ if (!scanHeader.verify()) SWT.error(SWT.ERROR_INVALID_IMAGE);
+
+ /* Process scan(s) and further tables until EOI. */
+ int progressiveScanCount = 0;
+ boolean done = false;
+ while(!done) {
+ resetInputBuffer();
+ precedingDCs = new int[4];
+ decodeScan();
+ if (progressive && loader.hasListeners()) {
+ ImageData imageData = createImageData();
+ loader.notifyListeners(new ImageLoaderEvent(loader, imageData, progressiveScanCount, false));
+ progressiveScanCount++;
+ }
+
+ /* Unread any buffered data before looking for tables again. */
+ int delta = 512 - bufferCurrentPosition - 1;
+ if (delta > 0) {
+ byte[] unreadBuffer = new byte[delta];
+ System.arraycopy(dataBuffer, bufferCurrentPosition + 1, unreadBuffer, 0, delta);
+ try {
+ inputStream.unread(unreadBuffer);
+ } catch (IOException e) {
+ SWT.error(SWT.ERROR_IO, e);
+ }
+ }
+
+ /* Process the tables preceding the next scan header. */
+ JPEGSegment jpegSegment = processTables();
+ if (jpegSegment == null || jpegSegment.getSegmentMarker() == EOI) {
+ done = true;
+ } else {
+ scanHeader = new JPEGScanHeader(inputStream);
+ if (!scanHeader.verify()) SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+ }
+
+ if (progressive) {
+ for (int ymcu = 0; ymcu < interleavedMcuRows; ymcu++) {
+ for (int xmcu = 0; xmcu < interleavedMcuCols; xmcu++) {
+ for (int iComp = 0; iComp < nComponents; iComp++) {
+ int[] frameComponent = frameComponents[componentIds[iComp]];
+ int hi = frameComponent[HI];
+ int vi = frameComponent[VI];
+ int compWidth = frameComponent[CW];
+ for (int ivi = 0; ivi < vi; ivi++) {
+ for (int ihi = 0; ihi < hi; ihi++) {
+ int index = (ymcu * vi + ivi) * compWidth + xmcu * hi + ihi;
+ dataUnit = dataUnits[iComp][index];
+ dequantize(dataUnit, iComp);
+ inverseDCT(dataUnit);
+ storeData(dataUnit, iComp, xmcu, ymcu, hi, ihi, vi, ivi);
+ }
+ }
+ }
+ }
+ }
+ dataUnits = null; // release memory
+ }
+ ImageData imageData = createImageData();
+ if (progressive && loader.hasListeners()) {
+ loader.notifyListeners(new ImageLoaderEvent(loader, imageData, progressiveScanCount, true));
+ }
+ return new ImageData[] {imageData};
+}
+ImageData createImageData() {
+ return ImageData.internal_new(
+ imageWidth,
+ imageHeight,
+ nComponents * samplePrecision,
+ setUpPalette(),
+ nComponents == 1 ? 4 : 1,
+ decodeImageComponents(),
+ 0,
+ null,
+ null,
+ -1,
+ -1,
+ SWT.IMAGE_JPEG,
+ 0,
+ 0,
+ 0,
+ 0);
+}
+int nextBit() {
+ if (currentBitCount != 0) {
+ currentBitCount--;
+ currentByte *= 2;
+ if (currentByte > 255) {
+ currentByte -= 256;
+ return 1;
+ } else {
+ return 0;
+ }
+ }
+ bufferCurrentPosition++;
+ if (bufferCurrentPosition >= 512) {
+ resetInputBuffer();
+ bufferCurrentPosition = 0;
+ }
+ currentByte = dataBuffer[bufferCurrentPosition] & 0xFF;
+ currentBitCount = 8;
+ byte nextByte;
+ if (bufferCurrentPosition == 511) {
+ resetInputBuffer();
+ currentBitCount = 8;
+ nextByte = dataBuffer[0];
+ } else {
+ nextByte = dataBuffer[bufferCurrentPosition + 1];
+ }
+ if (currentByte == 0xFF) {
+ if (nextByte == 0) {
+ bufferCurrentPosition ++;
+ currentBitCount--;
+ currentByte *= 2;
+ if (currentByte > 255) {
+ currentByte -= 256;
+ return 1;
+ } else {
+ return 0;
+ }
+ } else {
+ if ((nextByte & 0xFF) + 0xFF00 == DNL) {
+ getDNL();
+ return 0;
+ } else {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ return 0;
+ }
+ }
+ } else {
+ currentBitCount--;
+ currentByte *= 2;
+ if (currentByte > 255) {
+ currentByte -= 256;
+ return 1;
+ } else {
+ return 0;
+ }
+ }
+}
+void processRestartInterval() {
+ do {
+ bufferCurrentPosition++;
+ if (bufferCurrentPosition > 511) {
+ resetInputBuffer();
+ bufferCurrentPosition = 0;
+ }
+ currentByte = dataBuffer[bufferCurrentPosition] & 0xFF;
+ } while (currentByte != 0xFF);
+ while (currentByte == 0xFF) {
+ bufferCurrentPosition++;
+ if (bufferCurrentPosition > 511) {
+ resetInputBuffer();
+ bufferCurrentPosition = 0;
+ }
+ currentByte = dataBuffer[bufferCurrentPosition] & 0xFF;
+ }
+ if (currentByte != ((RST0 + nextRestartNumber) & 0xFF)) {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+ bufferCurrentPosition++;
+ if (bufferCurrentPosition > 511) {
+ resetInputBuffer();
+ bufferCurrentPosition = 0;
+ }
+ currentByte = dataBuffer[bufferCurrentPosition] & 0xFF;
+ currentBitCount = 8;
+ restartsToGo = restartInterval;
+ nextRestartNumber = (nextRestartNumber + 1) & 0x7;
+ precedingDCs = new int[4];
+ eobrun = 0;
+}
+/* Process all markers until a frame header, scan header, or EOI is found. */
+JPEGSegment processTables() {
+ while (true) {
+ JPEGSegment jpegSegment = seekUnspecifiedMarker(inputStream);
+ if (jpegSegment == null) return null;
+ JPEGFrameHeader sof = new JPEGFrameHeader(jpegSegment.reference);
+ if (sof.verify()) {
+ return jpegSegment;
+ }
+ int marker = jpegSegment.getSegmentMarker();
+ switch (marker) {
+ case SOI: // there should only be one SOI per file
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ case EOI:
+ case SOS:
+ return jpegSegment;
+ case DQT:
+ getDQT();
+ break;
+ case DHT:
+ getDHT();
+ break;
+ case DAC:
+ getDAC();
+ break;
+ case DRI:
+ getDRI();
+ break;
+ case APP0:
+ getAPP0();
+ break;
+ case COM:
+ getCOM();
+ break;
+ default:
+ skipSegmentFrom(inputStream);
+
+ }
+ }
+}
+void quantizeData(int[] dataUnit, int iComp) {
+ int[] qTable = quantizationTables[frameComponents[componentIds[iComp]][TQI]];
+ for (int i = 0; i < dataUnit.length; i++) {
+ int zzIndex = ZigZag8x8[i];
+ int data = dataUnit[zzIndex];
+ int absData = data < 0 ? 0 - data : data;
+ int qValue = qTable[i];
+ int q2 = qValue >> 1;
+ absData += q2;
+ if (absData < qValue) {
+ dataUnit[zzIndex] = 0;
+ } else {
+ absData /= qValue;
+ if (data >= 0) {
+ dataUnit[zzIndex] = absData;
+ } else {
+ dataUnit[zzIndex] = 0 - absData;
+ }
+ }
+ }
+}
+int receive(int nBits) {
+ int v = 0;
+ for (int i = 0; i < nBits; i++) {
+ v = v * 2 + nextBit();
+ }
+ return v;
+}
+void resetInputBuffer() {
+ if (dataBuffer == null) {
+ dataBuffer = new byte[512];
+ }
+ try {
+ inputStream.read(dataBuffer);
+ } catch (IOException e) {
+ SWT.error(SWT.ERROR_IO, e);
+ }
+ currentBitCount = 0;
+ bufferCurrentPosition = -1;
+}
+void resetOutputBuffer() {
+ if (dataBuffer == null) {
+ dataBuffer = new byte[512];
+ } else {
+ try {
+ outputStream.write(dataBuffer, 0, bufferCurrentPosition);
+ } catch (IOException e) {
+ SWT.error(SWT.ERROR_IO, e);
+ }
+ }
+ bufferCurrentPosition = 0;
+}
+static JPEGSegment seekUnspecifiedMarker(LEDataInputStream byteStream) {
+ byte[] byteArray = new byte[2];
+ try {
+ while (true) {
+ if (byteStream.read(byteArray, 0, 1) != 1) return null;
+ if (byteArray[0] == (byte) 0xFF) {
+ if (byteStream.read(byteArray, 1, 1) != 1) return null;
+ if (byteArray[1] != (byte) 0xFF && byteArray[1] != 0) {
+ byteStream.unread(byteArray);
+ return new JPEGSegment(byteArray);
+ }
+ }
+ }
+ } catch (IOException e) {
+ SWT.error(SWT.ERROR_IO, e);
+ }
+ return null;
+}
+PaletteData setUpPalette() {
+ if (nComponents == 1) {
+ RGB[] entries = new RGB[256];
+ for (int i = 0; i < 256; i++) {
+ entries[i] = new RGB(i, i, i);
+ }
+ return new PaletteData(entries);
+ }
+ return new PaletteData(0xFF, 0xFF00, 0xFF0000);
+}
+static void skipSegmentFrom(LEDataInputStream byteStream) {
+ try {
+ byte[] byteArray = new byte[4];
+ JPEGSegment jpegSegment = new JPEGSegment(byteArray);
+
+ if (byteStream.read(byteArray) != byteArray.length) {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+ if (!(byteArray[0] == -1 && byteArray[1] != 0 && byteArray[1] != -1)) {
+ SWT.error(SWT.ERROR_INVALID_IMAGE);
+ }
+ int delta = jpegSegment.getSegmentLength() - 2;
+ byteStream.skip(delta);
+ } catch (Exception e) {
+ SWT.error(SWT.ERROR_IO, e);
+ }
+}
+void storeData(int[] dataUnit, int iComp, int xmcu, int ymcu, int hi, int ihi, int vi, int ivi) {
+ byte[] compImage = imageComponents[iComp];
+ int[] frameComponent = frameComponents[componentIds[iComp]];
+ int compWidth = frameComponent[CW];
+ int destIndex = ((ymcu * vi + ivi) * compWidth * DCTSIZE) + ((xmcu * hi + ihi) * DCTSIZE);
+ int srcIndex = 0;
+ for (int i = 0; i < DCTSIZE; i++) {
+ for (int col = 0; col < DCTSIZE; col++) {
+ int x = dataUnit[srcIndex] + 128;
+ if (x < 0) {
+ x = 0;
+ } else {
+ if (x > 255) x = 255;
+ }
+ compImage[destIndex + col] = (byte)x;
+ srcIndex++;
+ }
+ destIndex += compWidth;
+ }
+}
+@Override
+void unloadIntoByteStream(ImageLoader loader) {
+ ImageData image = loader.data[0];
+ if (!new JPEGStartOfImage().writeToStream(outputStream)) {
+ SWT.error(SWT.ERROR_IO);
+ }
+ JPEGAppn appn = new JPEGAppn(new byte[] {(byte)0xFF, (byte)0xE0, 0, 0x10, 0x4A, 0x46, 0x49, 0x46, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0});
+ if (!appn.writeToStream(outputStream)) {
+ SWT.error(SWT.ERROR_IO);
+ }
+ quantizationTables = new int[4][];
+ JPEGQuantizationTable chromDQT = JPEGQuantizationTable.defaultChrominanceTable();
+ int encoderQFactor = loader.compression >= 1 && loader.compression <= 100 ? loader.compression : 75;
+ chromDQT.scaleBy(encoderQFactor);
+ int[] jpegDQTKeys = chromDQT.getQuantizationTablesKeys();
+ int[][] jpegDQTValues = chromDQT.getQuantizationTablesValues();
+ for (int i = 0; i < jpegDQTKeys.length; i++) {
+ quantizationTables[jpegDQTKeys[i]] = jpegDQTValues[i];
+ }
+ JPEGQuantizationTable lumDQT = JPEGQuantizationTable.defaultLuminanceTable();
+ lumDQT.scaleBy(encoderQFactor);
+ jpegDQTKeys = lumDQT.getQuantizationTablesKeys();
+ jpegDQTValues = lumDQT.getQuantizationTablesValues();
+ for (int i = 0; i < jpegDQTKeys.length; i++) {
+ quantizationTables[jpegDQTKeys[i]] = jpegDQTValues[i];
+ }
+ if (!lumDQT.writeToStream(outputStream)) {
+ SWT.error(SWT.ERROR_IO);
+ }
+ if (!chromDQT.writeToStream(outputStream)) {
+ SWT.error(SWT.ERROR_IO);
+ }
+ int frameLength, scanLength, precision;
+ int[][] frameParams, scanParams;
+ if (image.depth == 1) {
+ frameLength = 11;
+ frameParams = new int[1][];
+ frameParams[0] = new int[] {1, 1, 1, 0, 0};
+ scanParams = new int[1][];
+ scanParams[0] = new int[] {0, 0};
+ scanLength = 8;
+ nComponents = 1;
+ precision = 1;
+ } else {
+ frameLength = 17;
+ frameParams = new int[3][];
+ frameParams[0] = new int[] {0, 2, 2, 0, 0};
+ frameParams[1] = new int[] {1, 1, 1, 0, 0};
+ frameParams[2] = new int[] {1, 1, 1, 0, 0};
+ scanParams = new int[3][];
+ scanParams[0] = new int[] {0, 0};
+ scanParams[1] = new int[] {1, 1};
+ scanParams[2] = new int[] {1, 1};
+ scanLength = 12;
+ nComponents = 3;
+ precision = 8;
+ }
+ imageWidth = image.width;
+ imageHeight = image.height;
+ frameHeader = new JPEGFrameHeader(new byte[19]);
+ frameHeader.setSegmentMarker(SOF0);
+ frameHeader.setSegmentLength(frameLength);
+ frameHeader.setSamplePrecision(precision);
+ frameHeader.setSamplesPerLine(imageWidth);
+ frameHeader.setNumberOfLines(imageHeight);
+ frameHeader.setNumberOfImageComponents(nComponents);
+ frameHeader.componentParameters = frameParams;
+ frameHeader.componentIdentifiers = new int[] {0, 1, 2};
+ frameHeader.initializeContents();
+ if (!frameHeader.writeToStream(outputStream)) {
+ SWT.error(SWT.ERROR_IO);
+ }
+ frameComponents = frameParams;
+ componentIds = frameHeader.componentIdentifiers;
+ maxH = frameHeader.getMaxHFactor();
+ maxV = frameHeader.getMaxVFactor();
+ int mcuWidth = maxH * DCTSIZE;
+ int mcuHeight = maxV * DCTSIZE;
+ interleavedMcuCols = (imageWidth + mcuWidth - 1) / mcuWidth;
+ interleavedMcuRows = (imageHeight + mcuHeight - 1) / mcuHeight;
+ acHuffmanTables = new JPEGHuffmanTable[4];
+ dcHuffmanTables = new JPEGHuffmanTable[4];
+ JPEGHuffmanTable[] dhtTables = new JPEGHuffmanTable[] {
+ JPEGHuffmanTable.getDefaultDCLuminanceTable(),
+ JPEGHuffmanTable.getDefaultDCChrominanceTable(),
+ JPEGHuffmanTable.getDefaultACLuminanceTable(),
+ JPEGHuffmanTable.getDefaultACChrominanceTable()
+ };
+ for (int i = 0; i < dhtTables.length; i++) {
+ JPEGHuffmanTable dhtTable = dhtTables[i];
+ if (!dhtTable.writeToStream(outputStream)) {
+ SWT.error(SWT.ERROR_IO);
+ }
+ JPEGHuffmanTable[] allTables = dhtTable.getAllTables();
+ for (int j = 0; j < allTables.length; j++) {
+ JPEGHuffmanTable huffmanTable = allTables[j];
+ if (huffmanTable.getTableClass() == 0) {
+ dcHuffmanTables[huffmanTable.getTableIdentifier()] = huffmanTable;
+ } else {
+ acHuffmanTables[huffmanTable.getTableIdentifier()] = huffmanTable;
+ }
+ }
+ }
+ precedingDCs = new int[4];
+ scanHeader = new JPEGScanHeader(new byte[14]);
+ scanHeader.setSegmentMarker(SOS);
+ scanHeader.setSegmentLength(scanLength);
+ scanHeader.setNumberOfImageComponents(nComponents);
+ scanHeader.setStartOfSpectralSelection(0);
+ scanHeader.setEndOfSpectralSelection(63);
+ scanHeader.componentParameters = scanParams;
+ scanHeader.initializeContents();
+ if (!scanHeader.writeToStream(outputStream)) {
+ SWT.error(SWT.ERROR_IO);
+ }
+ convertImageToYCbCr(image);
+ resetOutputBuffer();
+ currentByte = 0;
+ currentBitCount = 0;
+ encodeScan();
+ if (!new JPEGEndOfImage().writeToStream(outputStream)) {
+ SWT.error(SWT.ERROR_IO);
+ }
+}
+}
Code Review / simantics / platform.git / blobdiff