Mercurial > projects > dwt2
diff org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/internal/image/JPEGFrameHeader.d @ 0:6dd524f61e62
add dwt win and basic java stuff
author | Frank Benoit <benoit@tionex.de> |
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date | Mon, 02 Mar 2009 14:44:16 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/internal/image/JPEGFrameHeader.d Mon Mar 02 14:44:16 2009 +0100 @@ -0,0 +1,220 @@ +/******************************************************************************* + * Copyright (c) 2000, 2005 IBM Corporation and others. + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * which accompanies this distribution, and is available at + * http://www.eclipse.org/legal/epl-v10.html + * + * Contributors: + * IBM Corporation - initial API and implementation + * Port to the D programming language: + * Frank Benoit <benoit@tionex.de> + *******************************************************************************/ +module org.eclipse.swt.internal.image.JPEGFrameHeader; + + +import org.eclipse.swt.SWT; +import org.eclipse.swt.internal.image.JPEGVariableSizeSegment; +import org.eclipse.swt.internal.image.JPEGFileFormat; +import org.eclipse.swt.internal.image.LEDataInputStream; +import java.lang.all; + +final class JPEGFrameHeader : JPEGVariableSizeSegment { + int maxVFactor; + int maxHFactor; + public int[] componentIdentifiers; + public int[][] componentParameters; + + public this(byte[] reference) { + super(reference); + } + + public this(LEDataInputStream byteStream) { + super(byteStream); + initializeComponentParameters(); + } + + public int getSamplePrecision() { + return reference[4] & 0xFF; + } + + public int getNumberOfLines() { + return (reference[5] & 0xFF) << 8 | (reference[6] & 0xFF); + } + + public int getSamplesPerLine() { + return (reference[7] & 0xFF) << 8 | (reference[8] & 0xFF); + } + + public int getNumberOfImageComponents() { + return reference[9] & 0xFF; + } + + public void setSamplePrecision(int precision) { + reference[4] = cast(byte)(precision & 0xFF); + } + + public void setNumberOfLines(int anInteger) { + reference[5] = cast(byte)((anInteger & 0xFF00) >> 8); + reference[6] = cast(byte)(anInteger & 0xFF); + } + + public void setSamplesPerLine(int samples) { + reference[7] = cast(byte)((samples & 0xFF00) >> 8); + reference[8] = cast(byte)(samples & 0xFF); + } + + public void setNumberOfImageComponents(int anInteger) { + reference[9] = cast(byte)(anInteger & 0xFF); + } + + public int getMaxHFactor() { + return maxHFactor; + } + + public int getMaxVFactor() { + return maxVFactor; + } + + public void setMaxHFactor(int anInteger) { + maxHFactor = anInteger; + } + + public void setMaxVFactor(int anInteger) { + maxVFactor = anInteger; + } + + /* Used when decoding. */ + void initializeComponentParameters() { + int nf = getNumberOfImageComponents(); + componentIdentifiers = new int[nf]; + int[][] compSpecParams; + int hmax = 1; + int vmax = 1; + for (int i = 0; i < nf; i++) { + int ofs = i * 3 + 10; + int ci = reference[ofs] & 0xFF; + componentIdentifiers[i] = ci; + int hi = (reference[ofs + 1] & 0xFF) >> 4; + int vi = reference[ofs + 1] & 0xF; + int tqi = reference[ofs + 2] & 0xFF; + if (hi > hmax) { + hmax = hi; + } + if (vi > vmax) { + vmax = vi; + } + int[] compParam = new int[5]; + compParam[0] = tqi; + compParam[1] = hi; + compParam[2] = vi; + if (compSpecParams.length <= ci) { + int[][] newParams = new int[][](ci + 1); + System.arraycopy(compSpecParams, 0, newParams, 0, compSpecParams.length); + compSpecParams = newParams; + } + compSpecParams[ci] = compParam; + } + int x = getSamplesPerLine(); + int y = getNumberOfLines(); + int[] multiples = [ 8, 16, 24, 32 ]; + for (int i = 0; i < nf; i++) { + int[] compParam = compSpecParams[componentIdentifiers[i]]; + int hi = compParam[1]; + int vi = compParam[2]; + int compWidth = (x * hi + hmax - 1) / hmax; + int compHeight = (y * vi + vmax - 1) / vmax; + int dsWidth = roundUpToMultiple(compWidth, multiples[hi - 1]); + int dsHeight = roundUpToMultiple(compHeight, multiples[vi - 1]); + compParam[3] = dsWidth; + compParam[4] = dsHeight; + } + setMaxHFactor(hmax); + setMaxVFactor(vmax); + componentParameters = compSpecParams; + } + + /* Used when encoding. */ + public void initializeContents() { + int nf = getNumberOfImageComponents(); + if (nf is 0 || nf !is componentParameters.length) { + SWT.error(SWT.ERROR_INVALID_IMAGE); + } + int hmax = 0; + int vmax = 0; + int[][] compSpecParams = componentParameters; + for (int i = 0; i < nf; i++) { + int ofs = i * 3 + 10; + int[] compParam = compSpecParams[componentIdentifiers[i]]; + int hi = compParam[1]; + int vi = compParam[2]; + if (hi * vi > 4) { + SWT.error(SWT.ERROR_INVALID_IMAGE); + } + reference[ofs] = cast(byte)(i + 1); + reference[ofs + 1] = cast(byte)(hi * 16 + vi); + reference[ofs + 2] = cast(byte)(compParam[0]); + if (hi > hmax) hmax = hi; + if (vi > vmax) vmax = vi; + } + int x = getSamplesPerLine(); + int y = getNumberOfLines(); + int[] multiples = [8, 16, 24, 32]; + for (int i = 0; i < nf; i++) { + int[] compParam = compSpecParams[componentIdentifiers[i]]; + int hi = compParam[1]; + int vi = compParam[2]; + int compWidth = (x * hi + hmax - 1) / hmax; + int compHeight = (y * vi + vmax - 1) / vmax; + int dsWidth = roundUpToMultiple(compWidth, multiples[hi - 1]); + int dsHeight = roundUpToMultiple(compHeight, multiples[vi - 1]); + compParam[3] = dsWidth; + compParam[4] = dsHeight; + } + setMaxHFactor(hmax); + setMaxVFactor(vmax); + } + + int roundUpToMultiple(int anInteger, int mInteger) { + int a = anInteger + mInteger - 1; + return a - (a % mInteger); + } + + /* + * Verify the information contained in the receiver is correct. + * Answer true if the header contains a valid marker. Otherwise, + * answer false. Valid Start Of Frame markers are: + * SOF_0 - Baseline DCT, Huffman coding + * SOF_1 - Extended sequential DCT, Huffman coding + * SOF_2 - Progressive DCT, Huffman coding + * SOF_3 - Lossless (sequential), Huffman coding + * SOF_5 - Differential sequential, Huffman coding + * SOF_6 - Differential progressive, Huffman coding + * SOF_7 - Differential lossless, Huffman coding + * SOF_9 - Extended sequential DCT, arithmetic coding + * SOF_10 - Progressive DCT, arithmetic coding + * SOF_11 - Lossless (sequential), arithmetic coding + * SOF_13 - Differential sequential, arithmetic coding + * SOF_14 - Differential progressive, arithmetic coding + * SOF_15 - Differential lossless, arithmetic coding + */ + public override bool verify() { + int marker = getSegmentMarker(); + return (marker >= JPEGFileFormat.SOF0 && marker <= JPEGFileFormat.SOF3) || + (marker >= JPEGFileFormat.SOF5 && marker <= JPEGFileFormat.SOF7) || + (marker >= JPEGFileFormat.SOF9 && marker <= JPEGFileFormat.SOF11) || + (marker >= JPEGFileFormat.SOF13 && marker <= JPEGFileFormat.SOF15); + } + + public bool isProgressive() { + int marker = getSegmentMarker(); + return marker is JPEGFileFormat.SOF2 + || marker is JPEGFileFormat.SOF6 + || marker is JPEGFileFormat.SOF10 + || marker is JPEGFileFormat.SOF14; + } + + public bool isArithmeticCoding() { + return getSegmentMarker() >= JPEGFileFormat.SOF9; + } +}