bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/OS2BMPFileFormat.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * 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
  *******************************************************************************/
 package org.eclipse.swt.internal.image;


 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;
 import java.io.*;

 final class OS2BMPFileFormat extends FileFormat {
 	static final int BMPFileHeaderSize = 14;
 	static final int BMPHeaderFixedSize = 12;
 	int width, height, bitCount;

 boolean isFileFormat(LEDataInputStream stream) {
 	try {
 		byte[] header = new byte[18];
 		stream.read(header);
 		stream.unread(header);
 		int infoHeaderSize = (header[14] & 0xFF) | ((header[15] & 0xFF) << 8) | ((header[16] & 0xFF) << 16) | ((header[17] & 0xFF) << 24);
 		return header[0] == 0x42 && header[1] == 0x4D && infoHeaderSize == BMPHeaderFixedSize;
 	} catch (Exception e) {
 		return false;
 	}
 }
 byte[] loadData(byte[] infoHeader) {
 	int stride = (width * bitCount + 7) / 8;
 	stride = (stride + 3) / 4 * 4; // Round up to 4 byte multiple
 	byte[] data = loadData(infoHeader, stride);
 	flipScanLines(data, stride, height);
 	return data;
 }
 byte[] loadData(byte[] infoHeader, int stride) {
 	int dataSize = height * stride;
 	byte[] data = new byte[dataSize];
 	try {
 		if (inputStream.read(data) != dataSize)
 			SWT.error(SWT.ERROR_INVALID_IMAGE);
 	} catch (IOException e) {
 		SWT.error(SWT.ERROR_IO, e);
 	}
 	return data;
 }
 int[] loadFileHeader() {
 	int[] header = new int[5];
 	try {
 		header[0] = inputStream.readShort();
 		header[1] = inputStream.readInt();
 		header[2] = inputStream.readShort();
 		header[3] = inputStream.readShort();
 		header[4] = inputStream.readInt();
 	} catch (IOException e) {
 		SWT.error(SWT.ERROR_IO, e);
 	}
 	if (header[0] != 0x4D42)
 		SWT.error(SWT.ERROR_INVALID_IMAGE);
 	return header;
 }
 ImageData[] loadFromByteStream() {
 	int[] fileHeader = loadFileHeader();
 	byte[] infoHeader = new byte[BMPHeaderFixedSize];
 	try {
 		inputStream.read(infoHeader);
 	} catch (Exception e) {
 		SWT.error(SWT.ERROR_IO, e);
 	}
 	width = (infoHeader[4] & 0xFF) | ((infoHeader[5] & 0xFF) << 8);
 	height = (infoHeader[6] & 0xFF) | ((infoHeader[7] & 0xFF) << 8);
 	bitCount = (infoHeader[10] & 0xFF) | ((infoHeader[11] & 0xFF) << 8);
 	PaletteData palette = loadPalette(infoHeader);
 	if (inputStream.getPosition() < fileHeader[4]) {
 		// Seek to the specified offset
 		try {
 			inputStream.skip(fileHeader[4] - inputStream.getPosition());
 		} catch (IOException e) {
 			SWT.error(SWT.ERROR_IO, e);
 		}
 	}
 	byte[] data = loadData(infoHeader);
 	int type = SWT.IMAGE_OS2_BMP;
 	return new ImageData[] {
 		ImageData.internal_new(
 			width,
 			height,
 			bitCount,
 			palette,
 			4,
 			data,
 			0,
 			null,
 			null,
 			-1,
 			-1,
 			type,
 			0,
 			0,
 			0,
 			0)
 	};
 }
 PaletteData loadPalette(byte[] infoHeader) {
 	if (bitCount <= 8) {
 		int numColors = 1 << bitCount;
 		byte[] buf = new byte[numColors * 3];
 		try {
 			if (inputStream.read(buf) != buf.length)
 				SWT.error(SWT.ERROR_INVALID_IMAGE);
 		} catch (IOException e) {
 			SWT.error(SWT.ERROR_IO, e);
 		}
 		return paletteFromBytes(buf, numColors);
 	}
 	if (bitCount == 16) return new PaletteData(0x7C00, 0x3E0, 0x1F);
 	if (bitCount == 24) return new PaletteData(0xFF, 0xFF00, 0xFF0000);
 	return new PaletteData(0xFF00, 0xFF0000, 0xFF000000);
 }
 PaletteData paletteFromBytes(byte[] bytes, int numColors) {
 	int bytesOffset = 0;
 	RGB[] colors = new RGB[numColors];
 	for (int i = 0; i < numColors; i++) {
 		colors[i] = new RGB(bytes[bytesOffset + 2] & 0xFF,
 			bytes[bytesOffset + 1] & 0xFF,
 			bytes[bytesOffset] & 0xFF);
 		bytesOffset += 3;
 	}
 	return new PaletteData(colors);
 }
 /**
  * Answer a byte array containing the BMP representation of
  * the given device independent palette.
  */
 static byte[] paletteToBytes(PaletteData pal) {
 	int n = pal.colors == null ? 0 : (pal.colors.length < 256 ? pal.colors.length : 256);
 	byte[] bytes = new byte[n * 3];
 	int offset = 0;
 	for (int i = 0; i < n; i++) {
 		RGB col = pal.colors[i];
 		bytes[offset] = (byte)col.blue;
 		bytes[offset + 1] = (byte)col.green;
 		bytes[offset + 2] = (byte)col.red;
 		offset += 3;
 	}
 	return bytes;
 }
 /**
  * Unload the given image's data into the given byte stream.
  * Answer the number of bytes written.
  */
 int unloadData(ImageData image, OutputStream out) {
 	int bmpBpl = 0;
 	try {
 		int bpl = (image.width * image.depth + 7) / 8;
 		bmpBpl = (bpl + 3) / 4 * 4; // BMP pads scanlines to multiples of 4 bytes
 		int linesPerBuf = 32678 / bmpBpl;
 		byte[] buf = new byte[linesPerBuf * bmpBpl];
 		byte[] data = image.data;
 		int imageBpl = image.bytesPerLine;
 		int dataIndex = imageBpl * (image.height - 1); // Start at last line
 		if (image.depth == 16) {
 			for (int y = 0; y < image.height; y += linesPerBuf) {
 				int count = image.height - y;
 				if (linesPerBuf < count) count = linesPerBuf;
 				int bufOffset = 0;
 				for (int i = 0; i < count; i++) {
 					for (int wIndex = 0; wIndex < bpl; wIndex += 2) {
 						buf[bufOffset + wIndex + 1] = data[dataIndex + wIndex + 1];
 						buf[bufOffset + wIndex] = data[dataIndex + wIndex];
 					}
 					bufOffset += bmpBpl;
 					dataIndex -= imageBpl;
 				}
 				out.write(buf, 0, bufOffset);
 			}
 		} else {
 			for (int y = 0; y < image.height; y += linesPerBuf) {
 				int tmp = image.height - y;
 				int count = tmp < linesPerBuf ? tmp : linesPerBuf;
 				int bufOffset = 0;
 				for (int i = 0; i < count; i++) {
 					System.arraycopy(data, dataIndex, buf, bufOffset, bpl);
 					bufOffset += bmpBpl;
 					dataIndex -= imageBpl;
 				}
 				out.write(buf, 0, bufOffset);
 			}
 		}
 	} catch (IOException e) {
 		SWT.error(SWT.ERROR_IO, e);
 	}
 	return bmpBpl * image.height;
 }
 /**
  * Unload a DeviceIndependentImage using Windows .BMP format into the given
  * byte stream.
  */
 void unloadIntoByteStream(ImageLoader loader) {
 	ImageData image = loader.data[0];
 	byte[] rgbs;
 	int numCols;
 	if (!((image.depth == 1) || (image.depth == 4) || (image.depth == 8) ||
 		  (image.depth == 16) || (image.depth == 24) || (image.depth == 32)))
 			SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
 	PaletteData pal = image.palette;
 	if ((image.depth == 16) || (image.depth == 24) || (image.depth == 32)) {
 		if (!pal.isDirect)
 			SWT.error(SWT.ERROR_INVALID_IMAGE);
 		numCols = 0;
 		rgbs = null;
 	} else {
 		if (pal.isDirect)
 			SWT.error(SWT.ERROR_INVALID_IMAGE);
 		numCols = pal.colors.length;
 		rgbs = paletteToBytes(pal);
 	}
 	// Fill in file header, except for bfsize, which is done later.
 	int headersSize = BMPFileHeaderSize + BMPHeaderFixedSize;
 	int[] fileHeader = new int[5];
 	fileHeader[0] = 0x4D42;	// Signature
 	fileHeader[1] = 0; // File size - filled in later
 	fileHeader[2] = 0; // Reserved 1
 	fileHeader[3] = 0; // Reserved 2
 	fileHeader[4] = headersSize; // Offset to data
 	if (rgbs != null) {
 		fileHeader[4] += rgbs.length;
 	}

 	// Prepare data. This is done first so we don't have to try to rewind
 	// the stream and fill in the details later.
 	ByteArrayOutputStream out = new ByteArrayOutputStream();
 	unloadData(image, out);
 	byte[] data = out.toByteArray();

 	// Calculate file size
 	fileHeader[1] = fileHeader[4] + data.length;

 	// Write the headers
 	try {
 		outputStream.writeShort(fileHeader[0]);
 		outputStream.writeInt(fileHeader[1]);
 		outputStream.writeShort(fileHeader[2]);
 		outputStream.writeShort(fileHeader[3]);
 		outputStream.writeInt(fileHeader[4]);
 	} catch (IOException e) {
 		SWT.error(SWT.ERROR_IO, e);
 	}
 	try {
 		outputStream.writeInt(BMPHeaderFixedSize);
 		outputStream.writeShort(image.width);
 		outputStream.writeShort(image.height);
 		outputStream.writeShort(1);
 		outputStream.writeShort((short)image.depth);
 	} catch (IOException e) {
 		SWT.error(SWT.ERROR_IO, e);
 	}

 	// Unload palette
 	if (numCols > 0) {
 		try {
 			outputStream.write(rgbs);
 		} catch (IOException e) {
 			SWT.error(SWT.ERROR_IO, e);
 		}
 	}

 	// Unload the data
 	try {
 		outputStream.write(data);
 	} catch (IOException e) {
 		SWT.error(SWT.ERROR_IO, e);
 	}
 }
 void flipScanLines(byte[] data, int stride, int height) {
 	int i1 = 0;
 	int i2 = (height - 1) * stride;
 	for (int i = 0; i < height / 2; i++) {
 		for (int index = 0; index < stride; index++) {
 			byte b = data[index + i1];
 			data[index + i1] = data[index + i2];
 			data[index + i2] = b;
 		}
 		i1 += stride;
 		i2 -= stride;
 	}
 }

 }
	/*******************************************************************************
	* 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
	*******************************************************************************/
	package org.eclipse.swt.internal.image;


	import org.eclipse.swt.*;
	import org.eclipse.swt.graphics.*;
	import java.io.*;

	final class OS2BMPFileFormat extends FileFormat {
	static final int BMPFileHeaderSize = 14;
	static final int BMPHeaderFixedSize = 12;
	int width, height, bitCount;

	boolean isFileFormat(LEDataInputStream stream) {
	try {
	byte[] header = new byte[18];
	stream.read(header);
	stream.unread(header);
	int infoHeaderSize = (header[14] & 0xFF) \| ((header[15] & 0xFF) << 8) \| ((header[16] & 0xFF) << 16) \| ((header[17] & 0xFF) << 24);
	return header[0] == 0x42 && header[1] == 0x4D && infoHeaderSize == BMPHeaderFixedSize;
	} catch (Exception e) {
	return false;
	}
	}
	byte[] loadData(byte[] infoHeader) {
	int stride = (width * bitCount + 7) / 8;
	stride = (stride + 3) / 4 * 4; // Round up to 4 byte multiple
	byte[] data = loadData(infoHeader, stride);
	flipScanLines(data, stride, height);
	return data;
	}
	byte[] loadData(byte[] infoHeader, int stride) {
	int dataSize = height * stride;
	byte[] data = new byte[dataSize];
	try {
	if (inputStream.read(data) != dataSize)
	SWT.error(SWT.ERROR_INVALID_IMAGE);
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	return data;
	}
	int[] loadFileHeader() {
	int[] header = new int[5];
	try {
	header[0] = inputStream.readShort();
	header[1] = inputStream.readInt();
	header[2] = inputStream.readShort();
	header[3] = inputStream.readShort();
	header[4] = inputStream.readInt();
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	if (header[0] != 0x4D42)
	SWT.error(SWT.ERROR_INVALID_IMAGE);
	return header;
	}
	ImageData[] loadFromByteStream() {
	int[] fileHeader = loadFileHeader();
	byte[] infoHeader = new byte[BMPHeaderFixedSize];
	try {
	inputStream.read(infoHeader);
	} catch (Exception e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	width = (infoHeader[4] & 0xFF) \| ((infoHeader[5] & 0xFF) << 8);
	height = (infoHeader[6] & 0xFF) \| ((infoHeader[7] & 0xFF) << 8);
	bitCount = (infoHeader[10] & 0xFF) \| ((infoHeader[11] & 0xFF) << 8);
	PaletteData palette = loadPalette(infoHeader);
	if (inputStream.getPosition() < fileHeader[4]) {
	// Seek to the specified offset
	try {
	inputStream.skip(fileHeader[4] - inputStream.getPosition());
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	}
	byte[] data = loadData(infoHeader);
	int type = SWT.IMAGE_OS2_BMP;
	return new ImageData[] {
	ImageData.internal_new(
	width,
	height,
	bitCount,
	palette,
	4,
	data,
	0,
	null,
	null,
	-1,
	-1,
	type,
	0,
	0,
	0,
	0)
	};
	}
	PaletteData loadPalette(byte[] infoHeader) {
	if (bitCount <= 8) {
	int numColors = 1 << bitCount;
	byte[] buf = new byte[numColors * 3];
	try {
	if (inputStream.read(buf) != buf.length)
	SWT.error(SWT.ERROR_INVALID_IMAGE);
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	return paletteFromBytes(buf, numColors);
	}
	if (bitCount == 16) return new PaletteData(0x7C00, 0x3E0, 0x1F);
	if (bitCount == 24) return new PaletteData(0xFF, 0xFF00, 0xFF0000);
	return new PaletteData(0xFF00, 0xFF0000, 0xFF000000);
	}
	PaletteData paletteFromBytes(byte[] bytes, int numColors) {
	int bytesOffset = 0;
	RGB[] colors = new RGB[numColors];
	for (int i = 0; i < numColors; i++) {
	colors[i] = new RGB(bytes[bytesOffset + 2] & 0xFF,
	bytes[bytesOffset + 1] & 0xFF,
	bytes[bytesOffset] & 0xFF);
	bytesOffset += 3;
	}
	return new PaletteData(colors);
	}
	/**
	* Answer a byte array containing the BMP representation of
	* the given device independent palette.
	*/
	static byte[] paletteToBytes(PaletteData pal) {
	int n = pal.colors == null ? 0 : (pal.colors.length < 256 ? pal.colors.length : 256);
	byte[] bytes = new byte[n * 3];
	int offset = 0;
	for (int i = 0; i < n; i++) {
	RGB col = pal.colors[i];
	bytes[offset] = (byte)col.blue;
	bytes[offset + 1] = (byte)col.green;
	bytes[offset + 2] = (byte)col.red;
	offset += 3;
	}
	return bytes;
	}
	/**
	* Unload the given image's data into the given byte stream.
	* Answer the number of bytes written.
	*/
	int unloadData(ImageData image, OutputStream out) {
	int bmpBpl = 0;
	try {
	int bpl = (image.width * image.depth + 7) / 8;
	bmpBpl = (bpl + 3) / 4 * 4; // BMP pads scanlines to multiples of 4 bytes
	int linesPerBuf = 32678 / bmpBpl;
	byte[] buf = new byte[linesPerBuf * bmpBpl];
	byte[] data = image.data;
	int imageBpl = image.bytesPerLine;
	int dataIndex = imageBpl * (image.height - 1); // Start at last line
	if (image.depth == 16) {
	for (int y = 0; y < image.height; y += linesPerBuf) {
	int count = image.height - y;
	if (linesPerBuf < count) count = linesPerBuf;
	int bufOffset = 0;
	for (int i = 0; i < count; i++) {
	for (int wIndex = 0; wIndex < bpl; wIndex += 2) {
	buf[bufOffset + wIndex + 1] = data[dataIndex + wIndex + 1];
	buf[bufOffset + wIndex] = data[dataIndex + wIndex];
	}
	bufOffset += bmpBpl;
	dataIndex -= imageBpl;
	}
	out.write(buf, 0, bufOffset);
	}
	} else {
	for (int y = 0; y < image.height; y += linesPerBuf) {
	int tmp = image.height - y;
	int count = tmp < linesPerBuf ? tmp : linesPerBuf;
	int bufOffset = 0;
	for (int i = 0; i < count; i++) {
	System.arraycopy(data, dataIndex, buf, bufOffset, bpl);
	bufOffset += bmpBpl;
	dataIndex -= imageBpl;
	}
	out.write(buf, 0, bufOffset);
	}
	}
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	return bmpBpl * image.height;
	}
	/**
	* Unload a DeviceIndependentImage using Windows .BMP format into the given
	* byte stream.
	*/
	void unloadIntoByteStream(ImageLoader loader) {
	ImageData image = loader.data[0];
	byte[] rgbs;
	int numCols;
	if (!((image.depth == 1) \|\| (image.depth == 4) \|\| (image.depth == 8) \|\|
	(image.depth == 16) \|\| (image.depth == 24) \|\| (image.depth == 32)))
	SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
	PaletteData pal = image.palette;
	if ((image.depth == 16) \|\| (image.depth == 24) \|\| (image.depth == 32)) {
	if (!pal.isDirect)
	SWT.error(SWT.ERROR_INVALID_IMAGE);
	numCols = 0;
	rgbs = null;
	} else {
	if (pal.isDirect)
	SWT.error(SWT.ERROR_INVALID_IMAGE);
	numCols = pal.colors.length;
	rgbs = paletteToBytes(pal);
	}
	// Fill in file header, except for bfsize, which is done later.
	int headersSize = BMPFileHeaderSize + BMPHeaderFixedSize;
	int[] fileHeader = new int[5];
	fileHeader[0] = 0x4D42; // Signature
	fileHeader[1] = 0; // File size - filled in later
	fileHeader[2] = 0; // Reserved 1
	fileHeader[3] = 0; // Reserved 2
	fileHeader[4] = headersSize; // Offset to data
	if (rgbs != null) {
	fileHeader[4] += rgbs.length;
	}

	// Prepare data. This is done first so we don't have to try to rewind
	// the stream and fill in the details later.
	ByteArrayOutputStream out = new ByteArrayOutputStream();
	unloadData(image, out);
	byte[] data = out.toByteArray();

	// Calculate file size
	fileHeader[1] = fileHeader[4] + data.length;

	// Write the headers
	try {
	outputStream.writeShort(fileHeader[0]);
	outputStream.writeInt(fileHeader[1]);
	outputStream.writeShort(fileHeader[2]);
	outputStream.writeShort(fileHeader[3]);
	outputStream.writeInt(fileHeader[4]);
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	try {
	outputStream.writeInt(BMPHeaderFixedSize);
	outputStream.writeShort(image.width);
	outputStream.writeShort(image.height);
	outputStream.writeShort(1);
	outputStream.writeShort((short)image.depth);
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}

	// Unload palette
	if (numCols > 0) {
	try {
	outputStream.write(rgbs);
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	}

	// Unload the data
	try {
	outputStream.write(data);
	} catch (IOException e) {
	SWT.error(SWT.ERROR_IO, e);
	}
	}
	void flipScanLines(byte[] data, int stride, int height) {
	int i1 = 0;
	int i2 = (height - 1) * stride;
	for (int i = 0; i < height / 2; i++) {
	for (int index = 0; index < stride; index++) {
	byte b = data[index + i1];
	data[index + i1] = data[index + i2];
	data[index + i2] = b;
	}
	i1 += stride;
	i2 -= stride;
	}
	}

	}